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gecko-dev/layout/base/nsLayoutUtils.cpp

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Этот файл содержит неоднозначные символы Юникода!

Этот файл содержит неоднозначные символы Юникода, которые могут быть перепутаны с другими в текущей локали. Если это намеренно, можете спокойно проигнорировать это предупреждение. Используйте кнопку Экранировать, чтобы подсветить эти символы.

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsLayoutUtils.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/layers/PAPZ.h"
#include "mozilla/Likely.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Unused.h"
#include "nsCharTraits.h"
#include "nsDocument.h"
#include "nsFontMetrics.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsAtom.h"
#include "nsCaret.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSColorUtils.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsPlaceholderFrame.h"
#include "nsIScrollableFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsIDOMEvent.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsFrameManager.h"
#include "nsBlockFrame.h"
#include "nsBidiPresUtils.h"
#include "imgIContainer.h"
#include "ImageOps.h"
#include "ImageRegion.h"
#include "gfxRect.h"
#include "gfxContext.h"
#include "gfxContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsCSSRendering.h"
#include "nsTextFragment.h"
#include "nsThemeConstants.h"
#include "nsPIDOMWindow.h"
#include "nsIDocShell.h"
#include "nsIWidget.h"
#include "gfxMatrix.h"
#include "gfxPrefs.h"
#include "gfxTypes.h"
#include "nsTArray.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "nsICanvasRenderingContextInternal.h"
#include "gfxPlatform.h"
#include <algorithm>
#include <limits>
#include "mozilla/dom/AnonymousContent.h"
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/DOMRect.h"
#include "mozilla/dom/DOMStringList.h"
#include "mozilla/dom/KeyframeEffectReadOnly.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "imgIRequest.h"
#include "nsIImageLoadingContent.h"
#include "nsCOMPtr.h"
#include "nsCSSProps.h"
#include "nsListControlFrame.h"
#include "mozilla/dom/Element.h"
#include "nsCanvasFrame.h"
#include "gfxDrawable.h"
#include "gfxEnv.h"
#include "gfxUtils.h"
#include "nsDataHashtable.h"
#include "nsTableWrapperFrame.h"
#include "nsTextFrame.h"
#include "nsFontFaceList.h"
#include "nsFontInflationData.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"
#include "SVGImageContext.h"
#include "SVGTextFrame.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "nsIFrameInlines.h"
#include "ImageContainer.h"
#include "nsComputedDOMStyle.h"
#include "ActiveLayerTracker.h"
#include "mozilla/gfx/2D.h"
#include "gfx2DGlue.h"
#include "mozilla/LookAndFeel.h"
#include "UnitTransforms.h"
#include "TiledLayerBuffer.h" // For TILEDLAYERBUFFER_TILE_SIZE
#include "ClientLayerManager.h"
#include "nsRefreshDriver.h"
#include "nsIContentViewer.h"
#include "LayersLogging.h"
#include "mozilla/Preferences.h"
#include "nsFrameSelection.h"
#include "FrameLayerBuilder.h"
#include "mozilla/layers/APZCTreeManager.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/Telemetry.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/RuleNodeCacheConditions.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "RegionBuilder.h"
#include "SVGViewportElement.h"
#include "DisplayItemClip.h"
#include "mozilla/layers/StackingContextHelper.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "prenv.h"
#include "RetainedDisplayListBuilder.h"
#include "DisplayListChecker.h"
#include "TextDrawTarget.h"
#include "nsDeckFrame.h"
#include "nsIEffectiveTLDService.h" // for IsInStyloBlocklist
#include "mozilla/StylePrefs.h"
#ifdef MOZ_XUL
#include "nsXULPopupManager.h"
#endif
#include "GeckoProfiler.h"
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/RestyleManagerInlines.h"
#include "LayoutLogging.h"
// Make sure getpid() works.
#ifdef XP_WIN
#include <process.h>
#define getpid _getpid
#else
#include <unistd.h>
#endif
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::image;
using namespace mozilla::layers;
using namespace mozilla::layout;
using namespace mozilla::gfx;
#define WEBKIT_PREFIXES_ENABLED_PREF_NAME "layout.css.prefixes.webkit"
#define TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME "layout.css.text-align-unsafe-value.enabled"
#define FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME "layout.css.float-logical-values.enabled"
#define INTERCHARACTER_RUBY_ENABLED_PREF_NAME "layout.css.ruby.intercharacter.enabled"
// The time in number of frames that we estimate for a refresh driver
// to be quiescent
#define DEFAULT_QUIESCENT_FRAMES 2
// The time (milliseconds) we estimate is needed between the end of an
// idle time and the next Tick.
#define DEFAULT_IDLE_PERIOD_TIME_LIMIT 1.0f
#ifdef DEBUG
// TODO: remove, see bug 598468.
bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
#endif // DEBUG
typedef FrameMetrics::ViewID ViewID;
typedef nsStyleTransformMatrix::TransformReferenceBox TransformReferenceBox;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationEmPerLine;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMinTwips;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationLineThreshold;
/* static */ int32_t nsLayoutUtils::sFontSizeInflationMappingIntercept;
/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMaxRatio;
/* static */ bool nsLayoutUtils::sFontSizeInflationForceEnabled;
/* static */ bool nsLayoutUtils::sFontSizeInflationDisabledInMasterProcess;
/* static */ uint32_t nsLayoutUtils::sSystemFontScale;
/* static */ uint32_t nsLayoutUtils::sZoomMaxPercent;
/* static */ uint32_t nsLayoutUtils::sZoomMinPercent;
/* static */ bool nsLayoutUtils::sInvalidationDebuggingIsEnabled;
/* static */ bool nsLayoutUtils::sInterruptibleReflowEnabled;
/* static */ bool nsLayoutUtils::sSVGTransformBoxEnabled;
/* static */ bool nsLayoutUtils::sTextCombineUprightDigitsEnabled;
#ifdef MOZ_STYLO
/* static */ bool nsLayoutUtils::sStyloEnabled;
/* static */ bool nsLayoutUtils::sStyloBlocklistEnabled;
/* static */ nsTArray<nsCString>* nsLayoutUtils::sStyloBlocklist = nullptr;
#endif
/* static */ uint32_t nsLayoutUtils::sIdlePeriodDeadlineLimit;
/* static */ uint32_t nsLayoutUtils::sQuiescentFramesBeforeIdlePeriod;
static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
static ContentMap* sContentMap = nullptr;
static ContentMap& GetContentMap() {
if (!sContentMap) {
sContentMap = new ContentMap();
}
return *sContentMap;
}
// When the pref "layout.css.prefixes.webkit" changes, this function is invoked
// to let us update kDisplayKTable, to selectively disable or restore the
// entries for "-webkit-box" and "-webkit-inline-box" in that table.
static void
WebkitPrefixEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
MOZ_ASSERT(strncmp(aPrefName, WEBKIT_PREFIXES_ENABLED_PREF_NAME,
ArrayLength(WEBKIT_PREFIXES_ENABLED_PREF_NAME)) == 0,
"We only registered this callback for a single pref, so it "
"should only be called for that pref");
static int32_t sIndexOfWebkitBoxInDisplayTable;
static int32_t sIndexOfWebkitInlineBoxInDisplayTable;
static int32_t sIndexOfWebkitFlexInDisplayTable;
static int32_t sIndexOfWebkitInlineFlexInDisplayTable;
static bool sAreKeywordIndicesInitialized; // initialized to false
bool isWebkitPrefixSupportEnabled =
Preferences::GetBool(WEBKIT_PREFIXES_ENABLED_PREF_NAME, false);
if (!sAreKeywordIndicesInitialized) {
// First run: find the position of the keywords in kDisplayKTable.
sIndexOfWebkitBoxInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__webkit_box,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfWebkitBoxInDisplayTable >= 0,
"Couldn't find -webkit-box in kDisplayKTable");
sIndexOfWebkitInlineBoxInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__webkit_inline_box,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfWebkitInlineBoxInDisplayTable >= 0,
"Couldn't find -webkit-inline-box in kDisplayKTable");
sIndexOfWebkitFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__webkit_flex,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfWebkitFlexInDisplayTable >= 0,
"Couldn't find -webkit-flex in kDisplayKTable");
sIndexOfWebkitInlineFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__webkit_inline_flex,
nsCSSProps::kDisplayKTable);
MOZ_ASSERT(sIndexOfWebkitInlineFlexInDisplayTable >= 0,
"Couldn't find -webkit-inline-flex in kDisplayKTable");
sAreKeywordIndicesInitialized = true;
}
// OK -- now, stomp on or restore the "-webkit-{box|flex}" entries in
// kDisplayKTable, depending on whether the webkit prefix pref is enabled
// vs. disabled.
if (sIndexOfWebkitBoxInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfWebkitBoxInDisplayTable].mKeyword =
isWebkitPrefixSupportEnabled ?
eCSSKeyword__webkit_box : eCSSKeyword_UNKNOWN;
}
if (sIndexOfWebkitInlineBoxInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfWebkitInlineBoxInDisplayTable].mKeyword =
isWebkitPrefixSupportEnabled ?
eCSSKeyword__webkit_inline_box : eCSSKeyword_UNKNOWN;
}
if (sIndexOfWebkitFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfWebkitFlexInDisplayTable].mKeyword =
isWebkitPrefixSupportEnabled ?
eCSSKeyword__webkit_flex : eCSSKeyword_UNKNOWN;
}
if (sIndexOfWebkitInlineFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfWebkitInlineFlexInDisplayTable].mKeyword =
isWebkitPrefixSupportEnabled ?
eCSSKeyword__webkit_inline_flex : eCSSKeyword_UNKNOWN;
}
}
// When the pref "layout.css.text-align-unsafe-value.enabled" changes, this
// function is called to let us update kTextAlignKTable & kTextAlignLastKTable,
// to selectively disable or restore the entries for "unsafe" in those tables.
static void
TextAlignUnsafeEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
NS_ASSERTION(strcmp(aPrefName, TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME) == 0,
"Did you misspell " TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME " ?");
static bool sIsInitialized;
static int32_t sIndexOfUnsafeInTextAlignTable;
static int32_t sIndexOfUnsafeInTextAlignLastTable;
bool isTextAlignUnsafeEnabled =
Preferences::GetBool(TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME, false);
if (!sIsInitialized) {
// First run: find the position of "unsafe" in kTextAlignKTable.
sIndexOfUnsafeInTextAlignTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_unsafe,
nsCSSProps::kTextAlignKTable);
// First run: find the position of "unsafe" in kTextAlignLastKTable.
sIndexOfUnsafeInTextAlignLastTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_unsafe,
nsCSSProps::kTextAlignLastKTable);
sIsInitialized = true;
}
// OK -- now, stomp on or restore the "unsafe" entry in the keyword tables,
// depending on whether the pref is enabled vs. disabled.
MOZ_ASSERT(sIndexOfUnsafeInTextAlignTable >= 0);
nsCSSProps::kTextAlignKTable[sIndexOfUnsafeInTextAlignTable].mKeyword =
isTextAlignUnsafeEnabled ? eCSSKeyword_unsafe : eCSSKeyword_UNKNOWN;
MOZ_ASSERT(sIndexOfUnsafeInTextAlignLastTable >= 0);
nsCSSProps::kTextAlignLastKTable[sIndexOfUnsafeInTextAlignLastTable].mKeyword =
isTextAlignUnsafeEnabled ? eCSSKeyword_unsafe : eCSSKeyword_UNKNOWN;
}
// When the pref "layout.css.float-logical-values.enabled" changes, this
// function is called to let us update kFloatKTable & kClearKTable,
// to selectively disable or restore the entries for logical values
// (inline-start and inline-end) in those tables.
static void
FloatLogicalValuesEnabledPrefChangeCallback(const char* aPrefName,
void* aClosure)
{
NS_ASSERTION(strcmp(aPrefName, FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME) == 0,
"Did you misspell " FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME " ?");
static bool sIsInitialized;
static int32_t sIndexOfInlineStartInFloatTable;
static int32_t sIndexOfInlineEndInFloatTable;
static int32_t sIndexOfInlineStartInClearTable;
static int32_t sIndexOfInlineEndInClearTable;
bool isFloatLogicalValuesEnabled =
Preferences::GetBool(FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME, false);
if (!sIsInitialized) {
// First run: find the position of "inline-start" in kFloatKTable.
sIndexOfInlineStartInFloatTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_start,
nsCSSProps::kFloatKTable);
// First run: find the position of "inline-end" in kFloatKTable.
sIndexOfInlineEndInFloatTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_end,
nsCSSProps::kFloatKTable);
// First run: find the position of "inline-start" in kClearKTable.
sIndexOfInlineStartInClearTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_start,
nsCSSProps::kClearKTable);
// First run: find the position of "inline-end" in kClearKTable.
sIndexOfInlineEndInClearTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_end,
nsCSSProps::kClearKTable);
sIsInitialized = true;
}
// OK -- now, stomp on or restore the logical entries in the keyword tables,
// depending on whether the pref is enabled vs. disabled.
MOZ_ASSERT(sIndexOfInlineStartInFloatTable >= 0);
nsCSSProps::kFloatKTable[sIndexOfInlineStartInFloatTable].mKeyword =
isFloatLogicalValuesEnabled ? eCSSKeyword_inline_start : eCSSKeyword_UNKNOWN;
MOZ_ASSERT(sIndexOfInlineEndInFloatTable >= 0);
nsCSSProps::kFloatKTable[sIndexOfInlineEndInFloatTable].mKeyword =
isFloatLogicalValuesEnabled ? eCSSKeyword_inline_end : eCSSKeyword_UNKNOWN;
MOZ_ASSERT(sIndexOfInlineStartInClearTable >= 0);
nsCSSProps::kClearKTable[sIndexOfInlineStartInClearTable].mKeyword =
isFloatLogicalValuesEnabled ? eCSSKeyword_inline_start : eCSSKeyword_UNKNOWN;
MOZ_ASSERT(sIndexOfInlineEndInClearTable >= 0);
nsCSSProps::kClearKTable[sIndexOfInlineEndInClearTable].mKeyword =
isFloatLogicalValuesEnabled ? eCSSKeyword_inline_end : eCSSKeyword_UNKNOWN;
}
template<typename TestType>
static bool
HasMatchingAnimations(EffectSet* aEffects, TestType&& aTest)
{
for (KeyframeEffectReadOnly* effect : *aEffects) {
if (aTest(*effect)) {
return true;
}
}
return false;
}
template<typename TestType>
static bool
HasMatchingAnimations(const nsIFrame* aFrame, TestType&& aTest)
{
EffectSet* effects = EffectSet::GetEffectSet(aFrame);
if (!effects) {
return false;
}
return HasMatchingAnimations(effects, aTest);
}
bool
nsLayoutUtils::HasCurrentTransitions(const nsIFrame* aFrame)
{
return HasMatchingAnimations(aFrame,
[](KeyframeEffectReadOnly& aEffect)
{
// Since |aEffect| is current, it must have an associated Animation
// so we don't need to null-check the result of GetAnimation().
return aEffect.IsCurrent() && aEffect.GetAnimation()->AsCSSTransition();
}
);
}
static bool
MayHaveAnimationOfProperty(EffectSet* effects, nsCSSPropertyID aProperty)
{
MOZ_ASSERT(effects);
if (aProperty == eCSSProperty_transform &&
!effects->MayHaveTransformAnimation()) {
return false;
}
if (aProperty == eCSSProperty_opacity &&
!effects->MayHaveOpacityAnimation()) {
return false;
}
return true;
}
static bool
MayHaveAnimationOfProperty(const nsIFrame* aFrame, nsCSSPropertyID aProperty)
{
switch (aProperty) {
case eCSSProperty_transform:
return aFrame->MayHaveTransformAnimation();
case eCSSProperty_opacity:
return aFrame->MayHaveOpacityAnimation();
default:
MOZ_ASSERT_UNREACHABLE("unexpected property");
return false;
}
}
bool
nsLayoutUtils::HasAnimationOfProperty(EffectSet* aEffectSet,
nsCSSPropertyID aProperty)
{
if (!aEffectSet || !MayHaveAnimationOfProperty(aEffectSet, aProperty)) {
return false;
}
return HasMatchingAnimations(aEffectSet,
[&aProperty](KeyframeEffectReadOnly& aEffect)
{
return (aEffect.IsInEffect() || aEffect.IsCurrent()) &&
aEffect.HasAnimationOfProperty(aProperty);
}
);
}
bool
nsLayoutUtils::HasAnimationOfProperty(const nsIFrame* aFrame,
nsCSSPropertyID aProperty)
{
if (!MayHaveAnimationOfProperty(aFrame, aProperty)) {
return false;
}
return HasMatchingAnimations(aFrame,
[&aProperty](KeyframeEffectReadOnly& aEffect)
{
return (aEffect.IsInEffect() || aEffect.IsCurrent()) &&
aEffect.HasAnimationOfProperty(aProperty);
}
);
}
bool
nsLayoutUtils::HasEffectiveAnimation(const nsIFrame* aFrame,
nsCSSPropertyID aProperty)
{
EffectSet* effects = EffectSet::GetEffectSet(aFrame);
if (!effects || !MayHaveAnimationOfProperty(effects, aProperty)) {
return false;
}
return HasMatchingAnimations(effects,
[&aProperty](KeyframeEffectReadOnly& aEffect)
{
return (aEffect.IsInEffect() || aEffect.IsCurrent()) &&
aEffect.HasEffectiveAnimationOfProperty(aProperty);
}
);
}
static float
GetSuitableScale(float aMaxScale, float aMinScale,
nscoord aVisibleDimension, nscoord aDisplayDimension)
{
float displayVisibleRatio = float(aDisplayDimension) /
float(aVisibleDimension);
// We want to rasterize based on the largest scale used during the
// transform animation, unless that would make us rasterize something
// larger than the screen. But we never want to go smaller than the
// minimum scale over the animation.
if (FuzzyEqualsMultiplicative(displayVisibleRatio, aMaxScale, .01f)) {
// Using aMaxScale may make us rasterize something a fraction larger than
// the screen. However, if aMaxScale happens to be the final scale of a
// transform animation it is better to use aMaxScale so that for the
// fraction of a second before we delayerize the composited texture it has
// a better chance of being pixel aligned and composited without resampling
// (avoiding visually clunky delayerization).
return aMaxScale;
}
return std::max(std::min(aMaxScale, displayVisibleRatio), aMinScale);
}
static inline void
UpdateMinMaxScale(const nsIFrame* aFrame,
const AnimationValue& aValue,
Size& aMinScale,
Size& aMaxScale)
{
Size size = aValue.GetScaleValue(aFrame);
aMaxScale.width = std::max<float>(aMaxScale.width, size.width);
aMaxScale.height = std::max<float>(aMaxScale.height, size.height);
aMinScale.width = std::min<float>(aMinScale.width, size.width);
aMinScale.height = std::min<float>(aMinScale.height, size.height);
}
static void
GetMinAndMaxScaleForAnimationProperty(const nsIFrame* aFrame,
nsTArray<RefPtr<dom::Animation>>& aAnimations,
Size& aMaxScale,
Size& aMinScale)
{
for (dom::Animation* anim : aAnimations) {
// This method is only expected to be passed animations that are running on
// the compositor and we only pass playing animations to the compositor,
// which are, by definition, "relevant" animations (animations that are
// not yet finished or which are filling forwards).
MOZ_ASSERT(anim->IsRelevant());
dom::KeyframeEffectReadOnly* effect =
anim->GetEffect() ? anim->GetEffect()->AsKeyframeEffect() : nullptr;
MOZ_ASSERT(effect, "A playing animation should have a keyframe effect");
for (size_t propIdx = effect->Properties().Length(); propIdx-- != 0; ) {
const AnimationProperty& prop = effect->Properties()[propIdx];
if (prop.mProperty != eCSSProperty_transform) {
continue;
}
// We need to factor in the scale of the base style if the base style
// will be used on the compositor.
AnimationValue baseStyle = effect->BaseStyle(prop.mProperty);
if (!baseStyle.IsNull()) {
UpdateMinMaxScale(aFrame, baseStyle, aMinScale, aMaxScale);
}
for (const AnimationPropertySegment& segment : prop.mSegments) {
// In case of add or accumulate composite, StyleAnimationValue does
// not have a valid value.
if (segment.HasReplaceableFromValue()) {
UpdateMinMaxScale(aFrame, segment.mFromValue, aMinScale, aMaxScale);
}
if (segment.HasReplaceableToValue()) {
UpdateMinMaxScale(aFrame, segment.mToValue, aMinScale, aMaxScale);
}
}
}
}
}
Size
nsLayoutUtils::ComputeSuitableScaleForAnimation(const nsIFrame* aFrame,
const nsSize& aVisibleSize,
const nsSize& aDisplaySize)
{
Size maxScale(std::numeric_limits<float>::min(),
std::numeric_limits<float>::min());
Size minScale(std::numeric_limits<float>::max(),
std::numeric_limits<float>::max());
nsTArray<RefPtr<dom::Animation>> compositorAnimations =
EffectCompositor::GetAnimationsForCompositor(aFrame,
eCSSProperty_transform);
GetMinAndMaxScaleForAnimationProperty(aFrame, compositorAnimations,
maxScale, minScale);
if (maxScale.width == std::numeric_limits<float>::min()) {
// We didn't encounter a transform
return Size(1.0, 1.0);
}
return Size(GetSuitableScale(maxScale.width, minScale.width,
aVisibleSize.width, aDisplaySize.width),
GetSuitableScale(maxScale.height, minScale.height,
aVisibleSize.height, aDisplaySize.height));
}
bool
nsLayoutUtils::AreAsyncAnimationsEnabled()
{
static bool sAreAsyncAnimationsEnabled;
static bool sAsyncPrefCached = false;
if (!sAsyncPrefCached) {
sAsyncPrefCached = true;
Preferences::AddBoolVarCache(&sAreAsyncAnimationsEnabled,
"layers.offmainthreadcomposition.async-animations");
}
return sAreAsyncAnimationsEnabled &&
gfxPlatform::OffMainThreadCompositingEnabled();
}
bool
nsLayoutUtils::IsAnimationLoggingEnabled()
{
static bool sShouldLog;
static bool sShouldLogPrefCached;
if (!sShouldLogPrefCached) {
sShouldLogPrefCached = true;
Preferences::AddBoolVarCache(&sShouldLog,
"layers.offmainthreadcomposition.log-animations");
}
return sShouldLog;
}
bool
nsLayoutUtils::AreRetainedDisplayListsEnabled()
{
if (XRE_IsContentProcess()) {
return gfxPrefs::LayoutRetainDisplayList();
} else {
return gfxPrefs::LayoutRetainDisplayListChrome();
}
}
bool
nsLayoutUtils::GPUImageScalingEnabled()
{
static bool sGPUImageScalingEnabled;
static bool sGPUImageScalingPrefInitialised = false;
if (!sGPUImageScalingPrefInitialised) {
sGPUImageScalingPrefInitialised = true;
sGPUImageScalingEnabled =
Preferences::GetBool("layout.gpu-image-scaling.enabled", false);
}
return sGPUImageScalingEnabled;
}
bool
nsLayoutUtils::AnimatedImageLayersEnabled()
{
static bool sAnimatedImageLayersEnabled;
static bool sAnimatedImageLayersPrefCached = false;
if (!sAnimatedImageLayersPrefCached) {
sAnimatedImageLayersPrefCached = true;
Preferences::AddBoolVarCache(&sAnimatedImageLayersEnabled,
"layout.animated-image-layers.enabled",
false);
}
return sAnimatedImageLayersEnabled;
}
bool
nsLayoutUtils::CSSFiltersEnabled()
{
static bool sCSSFiltersEnabled;
static bool sCSSFiltersPrefCached = false;
if (!sCSSFiltersPrefCached) {
sCSSFiltersPrefCached = true;
Preferences::AddBoolVarCache(&sCSSFiltersEnabled,
"layout.css.filters.enabled",
false);
}
return sCSSFiltersEnabled;
}
bool
nsLayoutUtils::UnsetValueEnabled()
{
static bool sUnsetValueEnabled;
static bool sUnsetValuePrefCached = false;
if (!sUnsetValuePrefCached) {
sUnsetValuePrefCached = true;
Preferences::AddBoolVarCache(&sUnsetValueEnabled,
"layout.css.unset-value.enabled",
false);
}
return sUnsetValueEnabled;
}
bool
nsLayoutUtils::IsTextAlignUnsafeValueEnabled()
{
static bool sTextAlignUnsafeValueEnabled;
static bool sTextAlignUnsafeValueEnabledPrefCached = false;
if (!sTextAlignUnsafeValueEnabledPrefCached) {
sTextAlignUnsafeValueEnabledPrefCached = true;
Preferences::AddBoolVarCache(&sTextAlignUnsafeValueEnabled,
TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME,
false);
}
return sTextAlignUnsafeValueEnabled;
}
bool
nsLayoutUtils::IsInterCharacterRubyEnabled()
{
static bool sInterCharacterRubyEnabled;
static bool sInterCharacterRubyEnabledPrefCached = false;
if (!sInterCharacterRubyEnabledPrefCached) {
sInterCharacterRubyEnabledPrefCached = true;
Preferences::AddBoolVarCache(&sInterCharacterRubyEnabled,
INTERCHARACTER_RUBY_ENABLED_PREF_NAME,
false);
}
return sInterCharacterRubyEnabled;
}
void
nsLayoutUtils::UnionChildOverflow(nsIFrame* aFrame,
nsOverflowAreas& aOverflowAreas,
FrameChildListIDs aSkipChildLists)
{
// Iterate over all children except pop-ups.
FrameChildListIDs skip = aSkipChildLists |
nsIFrame::kSelectPopupList | nsIFrame::kPopupList;
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
nsOverflowAreas childOverflow =
child->GetOverflowAreas() + child->GetPosition();
aOverflowAreas.UnionWith(childOverflow);
}
}
}
static void DestroyViewID(void* aObject, nsAtom* aPropertyName,
void* aPropertyValue, void* aData)
{
ViewID* id = static_cast<ViewID*>(aPropertyValue);
GetContentMap().Remove(*id);
delete id;
}
/**
* A namespace class for static layout utilities.
*/
bool
nsLayoutUtils::FindIDFor(const nsIContent* aContent, ViewID* aOutViewId)
{
void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
if (scrollIdProperty) {
*aOutViewId = *static_cast<ViewID*>(scrollIdProperty);
return true;
}
return false;
}
ViewID
nsLayoutUtils::FindOrCreateIDFor(nsIContent* aContent)
{
ViewID scrollId;
if (!FindIDFor(aContent, &scrollId)) {
scrollId = sScrollIdCounter++;
aContent->SetProperty(nsGkAtoms::RemoteId, new ViewID(scrollId),
DestroyViewID);
GetContentMap().Put(scrollId, aContent);
}
return scrollId;
}
nsIContent*
nsLayoutUtils::FindContentFor(ViewID aId)
{
MOZ_ASSERT(aId != FrameMetrics::NULL_SCROLL_ID,
"Cannot find a content element in map for null IDs.");
nsIContent* content;
bool exists = GetContentMap().Get(aId, &content);
if (exists) {
return content;
} else {
return nullptr;
}
}
nsIFrame*
GetScrollFrameFromContent(nsIContent* aContent)
{
nsIFrame* frame = aContent->GetPrimaryFrame();
if (aContent->OwnerDoc()->GetRootElement() == aContent) {
nsIPresShell* presShell = frame ? frame->PresShell() : nullptr;
if (!presShell) {
presShell = aContent->OwnerDoc()->GetShell();
}
// We want the scroll frame, the root scroll frame differs from all
// others in that the primary frame is not the scroll frame.
nsIFrame* rootScrollFrame = presShell ? presShell->GetRootScrollFrame() : nullptr;
if (rootScrollFrame) {
frame = rootScrollFrame;
}
}
return frame;
}
nsIScrollableFrame*
nsLayoutUtils::FindScrollableFrameFor(ViewID aId)
{
nsIContent* content = FindContentFor(aId);
if (!content) {
return nullptr;
}
nsIFrame* scrollFrame = GetScrollFrameFromContent(content);
return scrollFrame ? scrollFrame->GetScrollTargetFrame() : nullptr;
}
ViewID
nsLayoutUtils::FindIDForScrollableFrame(nsIScrollableFrame* aScrollable)
{
if (!aScrollable) {
return FrameMetrics::NULL_SCROLL_ID;
}
nsIFrame* scrollFrame = do_QueryFrame(aScrollable);
nsIContent* scrollContent = scrollFrame->GetContent();
FrameMetrics::ViewID scrollId;
if (scrollContent &&
nsLayoutUtils::FindIDFor(scrollContent, &scrollId)) {
return scrollId;
}
return FrameMetrics::NULL_SCROLL_ID;
}
static nsRect
ApplyRectMultiplier(nsRect aRect, float aMultiplier)
{
if (aMultiplier == 1.0f) {
return aRect;
}
float newWidth = aRect.width * aMultiplier;
float newHeight = aRect.height * aMultiplier;
float newX = aRect.x - ((newWidth - aRect.width) / 2.0f);
float newY = aRect.y - ((newHeight - aRect.height) / 2.0f);
// Rounding doesn't matter too much here, do a round-in
return nsRect(ceil(newX), ceil(newY), floor(newWidth), floor(newHeight));
}
bool
nsLayoutUtils::UsesAsyncScrolling(nsIFrame* aFrame)
{
#ifdef MOZ_WIDGET_ANDROID
// We always have async scrolling for android
return true;
#endif
return AsyncPanZoomEnabled(aFrame);
}
bool
nsLayoutUtils::AsyncPanZoomEnabled(nsIFrame* aFrame)
{
// We use this as a shortcut, since if the compositor will never use APZ,
// no widget will either.
if (!gfxPlatform::AsyncPanZoomEnabled()) {
return false;
}
nsIFrame *frame = nsLayoutUtils::GetDisplayRootFrame(aFrame);
nsIWidget* widget = frame->GetNearestWidget();
if (!widget) {
return false;
}
return widget->AsyncPanZoomEnabled();
}
float
nsLayoutUtils::GetCurrentAPZResolutionScale(nsIPresShell* aShell) {
return aShell ? aShell->GetCumulativeNonRootScaleResolution() : 1.0;
}
// Return the maximum displayport size, based on the LayerManager's maximum
// supported texture size. The result is in app units.
static nscoord
GetMaxDisplayPortSize(nsIContent* aContent, nsPresContext* aFallbackPrescontext)
{
MOZ_ASSERT(!gfxPrefs::LayersTilesEnabled(), "Do not clamp displayports if tiling is enabled");
// Pick a safe maximum displayport size for sanity purposes. This is the
// lowest maximum texture size on tileless-platforms (Windows, D3D10).
// If the gfx.max-texture-size pref is set, further restrict the displayport
// size to fit within that, because the compositor won't upload stuff larger
// than this size.
nscoord safeMaximum = aFallbackPrescontext
? aFallbackPrescontext->DevPixelsToAppUnits(
std::min(8192, gfxPlatform::MaxTextureSize()))
: nscoord_MAX;
nsIFrame* frame = aContent->GetPrimaryFrame();
if (!frame) {
return safeMaximum;
}
frame = nsLayoutUtils::GetDisplayRootFrame(frame);
nsIWidget* widget = frame->GetNearestWidget();
if (!widget) {
return safeMaximum;
}
LayerManager* lm = widget->GetLayerManager();
if (!lm) {
return safeMaximum;
}
nsPresContext* presContext = frame->PresContext();
int32_t maxSizeInDevPixels = lm->GetMaxTextureSize();
if (maxSizeInDevPixels < 0 || maxSizeInDevPixels == INT_MAX) {
return safeMaximum;
}
maxSizeInDevPixels = std::min(maxSizeInDevPixels, gfxPlatform::MaxTextureSize());
return presContext->DevPixelsToAppUnits(maxSizeInDevPixels);
}
static nsRect
GetDisplayPortFromRectData(nsIContent* aContent,
DisplayPortPropertyData* aRectData,
float aMultiplier)
{
// In the case where the displayport is set as a rect, we assume it is
// already aligned and clamped as necessary. The burden to do that is
// on the setter of the displayport. In practice very few places set the
// displayport directly as a rect (mostly tests). We still do need to
// expand it by the multiplier though.
return ApplyRectMultiplier(aRectData->mRect, aMultiplier);
}
static nsRect
GetDisplayPortFromMarginsData(nsIContent* aContent,
DisplayPortMarginsPropertyData* aMarginsData,
float aMultiplier)
{
// In the case where the displayport is set via margins, we apply the margins
// to a base rect. Then we align the expanded rect based on the alignment
// requested, further expand the rect by the multiplier, and finally, clamp it
// to the size of the scrollable rect.
nsRect base;
if (nsRect* baseData = static_cast<nsRect*>(aContent->GetProperty(nsGkAtoms::DisplayPortBase))) {
base = *baseData;
} else {
// In theory we shouldn't get here, but we do sometimes (see bug 1212136).
// Fall through for graceful handling.
}
nsIFrame* frame = GetScrollFrameFromContent(aContent);
if (!frame) {
// Turns out we can't really compute it. Oops. We still should return
// something sane. Note that since we can't clamp the rect without a
// frame, we don't apply the multiplier either as it can cause the result
// to leak outside the scrollable area.
NS_WARNING("Attempting to get a displayport from a content with no primary frame!");
return base;
}
bool isRoot = false;
if (aContent->OwnerDoc()->GetRootElement() == aContent) {
isRoot = true;
}
nsPoint scrollPos;
if (nsIScrollableFrame* scrollableFrame = frame->GetScrollTargetFrame()) {
scrollPos = scrollableFrame->GetScrollPosition();
}
nsPresContext* presContext = frame->PresContext();
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
LayoutDeviceToScreenScale2D res(presContext->PresShell()->GetCumulativeResolution()
* nsLayoutUtils::GetTransformToAncestorScale(frame));
// Calculate the expanded scrollable rect, which we'll be clamping the
// displayport to.
nsRect expandedScrollableRect =
nsLayoutUtils::CalculateExpandedScrollableRect(frame);
// GetTransformToAncestorScale() can return 0. In this case, just return the
// base rect (clamped to the expanded scrollable rect), as other calculations
// would run into divisions by zero.
if (res == LayoutDeviceToScreenScale2D(0, 0)) {
// Make sure the displayport remains within the scrollable rect.
return base.MoveInsideAndClamp(expandedScrollableRect - scrollPos);
}
// First convert the base rect to screen pixels
LayoutDeviceToScreenScale2D parentRes = res;
if (isRoot) {
// the base rect for root scroll frames is specified in the parent document
// coordinate space, so it doesn't include the local resolution.
float localRes = presContext->PresShell()->GetResolution();
parentRes.xScale /= localRes;
parentRes.yScale /= localRes;
}
ScreenRect screenRect = LayoutDeviceRect::FromAppUnits(base, auPerDevPixel)
* parentRes;
// Note on the correctness of applying the alignment in Screen space:
// The correct space to apply the alignment in would be Layer space, but
// we don't necessarily know the scale to convert to Layer space at this
// point because Layout may not yet have chosen the resolution at which to
// render (it chooses that in FrameLayerBuilder, but this can be called
// during display list building). Therefore, we perform the alignment in
// Screen space, which basically assumes that Layout chose to render at
// screen resolution; since this is what Layout does most of the time,
// this is a good approximation. A proper solution would involve moving
// the choosing of the resolution to display-list building time.
ScreenSize alignment;
if (APZCCallbackHelper::IsDisplayportSuppressed()) {
alignment = ScreenSize(1, 1);
} else if (gfxPrefs::LayersTilesEnabled()) {
// Don't align to tiles if they are too large, because we could expand
// the displayport by a lot which can take more paint time. It's a tradeoff
// though because if we don't align to tiles we have more waste on upload.
IntSize tileSize = gfxVars::TileSize();
alignment = ScreenSize(std::min(256, tileSize.width), std::min(256, tileSize.height));
} else {
// If we're not drawing with tiles then we need to be careful about not
// hitting the max texture size and we only need 1 draw call per layer
// so we can align to a smaller multiple.
alignment = ScreenSize(128, 128);
}
// Avoid division by zero.
if (alignment.width == 0) {
alignment.width = 128;
}
if (alignment.height == 0) {
alignment.height = 128;
}
if (gfxPrefs::LayersTilesEnabled()) {
// Expand the rect by the margins
screenRect.Inflate(aMarginsData->mMargins);
} else {
// Calculate the displayport to make sure we fit within the max texture size
// when not tiling.
nscoord maxSizeAppUnits = GetMaxDisplayPortSize(aContent, presContext);
MOZ_ASSERT(maxSizeAppUnits < nscoord_MAX);
// The alignment code can round up to 3 tiles, we want to make sure
// that the displayport can grow by up to 3 tiles without going
// over the max texture size.
const int MAX_ALIGN_ROUNDING = 3;
// Find the maximum size in screen pixels.
int32_t maxSizeDevPx = presContext->AppUnitsToDevPixels(maxSizeAppUnits);
int32_t maxWidthScreenPx = floor(double(maxSizeDevPx) * res.xScale) -
MAX_ALIGN_ROUNDING * alignment.width;
int32_t maxHeightScreenPx = floor(double(maxSizeDevPx) * res.yScale) -
MAX_ALIGN_ROUNDING * alignment.height;
// For each axis, inflate the margins up to the maximum size.
const ScreenMargin& margins = aMarginsData->mMargins;
if (screenRect.height < maxHeightScreenPx) {
int32_t budget = maxHeightScreenPx - screenRect.height;
// Scale the margins down to fit into the budget if necessary, maintaining
// their relative ratio.
float scale = 1.0f;
if (float(budget) < margins.TopBottom()) {
scale = float(budget) / margins.TopBottom();
}
float top = margins.top * scale;
float bottom = margins.bottom * scale;
screenRect.y -= top;
screenRect.height += top + bottom;
}
if (screenRect.width < maxWidthScreenPx) {
int32_t budget = maxWidthScreenPx - screenRect.width;
float scale = 1.0f;
if (float(budget) < margins.LeftRight()) {
scale = float(budget) / margins.LeftRight();
}
float left = margins.left * scale;
float right = margins.right * scale;
screenRect.x -= left;
screenRect.width += left + right;
}
}
ScreenPoint scrollPosScreen = LayoutDevicePoint::FromAppUnits(scrollPos, auPerDevPixel)
* res;
// Round-out the display port to the nearest alignment (tiles)
screenRect += scrollPosScreen;
float x = alignment.width * floor(screenRect.x / alignment.width);
float y = alignment.height * floor(screenRect.y / alignment.height);
float w = alignment.width * ceil(screenRect.width / alignment.width + 1);
float h = alignment.height * ceil(screenRect.height / alignment.height + 1);
screenRect = ScreenRect(x, y, w, h);
screenRect -= scrollPosScreen;
// Convert the aligned rect back into app units.
nsRect result = LayoutDeviceRect::ToAppUnits(screenRect / res, auPerDevPixel);
// If we have non-zero margins, expand the displayport for the low-res buffer
// if that's what we're drawing. If we have zero margins, we want the
// displayport to reflect the scrollport.
if (aMarginsData->mMargins != ScreenMargin()) {
result = ApplyRectMultiplier(result, aMultiplier);
}
// Make sure the displayport remains within the scrollable rect.
result = result.MoveInsideAndClamp(expandedScrollableRect - scrollPos);
return result;
}
static bool
HasVisibleAnonymousContents(nsIDocument* aDoc)
{
for (RefPtr<AnonymousContent>& ac : aDoc->GetAnonymousContents()) {
Element* elem = ac->GetContentNode();
// We check to see if the anonymous content node has a frame. If it doesn't,
// that means that's not visible to the user because e.g. it's display:none.
// For now we assume that if it has a frame, it is visible. We might be able
// to refine this further by adding complexity if it turns out this condition
// results in a lot of false positives.
if (elem && elem->GetPrimaryFrame()) {
return true;
}
}
return false;
}
bool
nsLayoutUtils::ShouldDisableApzForElement(nsIContent* aContent)
{
if (!aContent) {
return false;
}
nsIDocument* doc = aContent->GetComposedDoc();
nsIPresShell* rootShell = APZCCallbackHelper::GetRootContentDocumentPresShellForContent(aContent);
if (rootShell) {
if (nsIDocument* rootDoc = rootShell->GetDocument()) {
nsIContent* rootContent = rootShell->GetRootScrollFrame()
? rootShell->GetRootScrollFrame()->GetContent()
: rootDoc->GetDocumentElement();
// For the AccessibleCaret: disable APZ on any scrollable subframes that
// are not the root scrollframe of a document, if the document has any
// visible anonymous contents.
// If we find this is triggering in too many scenarios then we might
// want to tighten this check further. The main use cases for which we want
// to disable APZ as of this writing are listed in bug 1316318.
if (aContent != rootContent && HasVisibleAnonymousContents(rootDoc)) {
return true;
}
}
}
if (!doc) {
return false;
}
return gfxPrefs::APZDisableForScrollLinkedEffects() &&
doc->HasScrollLinkedEffect();
}
static bool
GetDisplayPortData(nsIContent* aContent,
DisplayPortPropertyData** aOutRectData,
DisplayPortMarginsPropertyData** aOutMarginsData)
{
MOZ_ASSERT(aOutRectData && aOutMarginsData);
*aOutRectData =
static_cast<DisplayPortPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPort));
*aOutMarginsData =
static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
if (!*aOutRectData && !*aOutMarginsData) {
// This content element has no displayport data at all
return false;
}
if (*aOutRectData && *aOutMarginsData) {
// choose margins if equal priority
if ((*aOutRectData)->mPriority > (*aOutMarginsData)->mPriority) {
*aOutMarginsData = nullptr;
} else {
*aOutRectData = nullptr;
}
}
NS_ASSERTION((*aOutRectData == nullptr) != (*aOutMarginsData == nullptr),
"Only one of aOutRectData or aOutMarginsData should be set!");
return true;
}
bool
nsLayoutUtils::IsMissingDisplayPortBaseRect(nsIContent* aContent)
{
DisplayPortPropertyData* rectData = nullptr;
DisplayPortMarginsPropertyData* marginsData = nullptr;
if (GetDisplayPortData(aContent, &rectData, &marginsData) && marginsData) {
return !aContent->GetProperty(nsGkAtoms::DisplayPortBase);
}
return false;
}
enum class MaxSizeExceededBehaviour {
// Ask GetDisplayPortImpl to assert if the calculated displayport exceeds
// the maximum allowed size.
eAssert,
// Ask GetDisplayPortImpl to pretend like there's no displayport at all, if
// the calculated displayport exceeds the maximum allowed size.
eDrop,
};
static bool
GetDisplayPortImpl(nsIContent* aContent, nsRect* aResult, float aMultiplier,
MaxSizeExceededBehaviour aBehaviour = MaxSizeExceededBehaviour::eAssert)
{
DisplayPortPropertyData* rectData = nullptr;
DisplayPortMarginsPropertyData* marginsData = nullptr;
if (!GetDisplayPortData(aContent, &rectData, &marginsData)) {
return false;
}
if (!aResult) {
// We have displayport data, but the caller doesn't want the actual
// rect, so we don't need to actually compute it.
return true;
}
nsRect result;
if (rectData) {
result = GetDisplayPortFromRectData(aContent, rectData, aMultiplier);
} else if (APZCCallbackHelper::IsDisplayportSuppressed() ||
nsLayoutUtils::ShouldDisableApzForElement(aContent)) {
DisplayPortMarginsPropertyData noMargins(ScreenMargin(), 1);
result = GetDisplayPortFromMarginsData(aContent, &noMargins, aMultiplier);
} else {
result = GetDisplayPortFromMarginsData(aContent, marginsData, aMultiplier);
}
if (!gfxPrefs::LayersTilesEnabled()) {
// Perform the desired error handling if the displayport dimensions
// exceeds the maximum allowed size
nscoord maxSize = GetMaxDisplayPortSize(aContent, nullptr);
if (result.width > maxSize || result.height > maxSize) {
switch (aBehaviour) {
case MaxSizeExceededBehaviour::eAssert:
NS_ASSERTION(false, "Displayport must be a valid texture size");
break;
case MaxSizeExceededBehaviour::eDrop:
return false;
}
}
}
*aResult = result;
return true;
}
void
TranslateFromScrollPortToScrollFrame(nsIContent* aContent, nsRect* aRect)
{
MOZ_ASSERT(aRect);
nsIFrame* frame = GetScrollFrameFromContent(aContent);
nsIScrollableFrame* scrollableFrame = frame ? frame->GetScrollTargetFrame() : nullptr;
if (scrollableFrame) {
*aRect += scrollableFrame->GetScrollPortRect().TopLeft();
}
}
bool
nsLayoutUtils::GetDisplayPort(nsIContent* aContent, nsRect *aResult,
RelativeTo aRelativeTo /* = RelativeTo::ScrollPort */)
{
float multiplier =
gfxPrefs::UseLowPrecisionBuffer() ? 1.0f / gfxPrefs::LowPrecisionResolution() : 1.0f;
bool usingDisplayPort = GetDisplayPortImpl(aContent, aResult, multiplier);
if (aResult && usingDisplayPort && aRelativeTo == RelativeTo::ScrollFrame) {
TranslateFromScrollPortToScrollFrame(aContent, aResult);
}
return usingDisplayPort;
}
bool
nsLayoutUtils::HasDisplayPort(nsIContent* aContent) {
return GetDisplayPort(aContent, nullptr);
}
/* static */ bool
nsLayoutUtils::GetDisplayPortForVisibilityTesting(
nsIContent* aContent,
nsRect* aResult,
RelativeTo aRelativeTo /* = RelativeTo::ScrollPort */)
{
MOZ_ASSERT(aResult);
// Since the base rect might not have been updated very recently, it's
// possible to end up with an extra-large displayport at this point, if the
// zoom level is changed by a lot. Instead of using the default behaviour of
// asserting, we can just ignore the displayport if that happens, as this
// call site is best-effort.
bool usingDisplayPort = GetDisplayPortImpl(aContent, aResult, 1.0f,
MaxSizeExceededBehaviour::eDrop);
if (usingDisplayPort && aRelativeTo == RelativeTo::ScrollFrame) {
TranslateFromScrollPortToScrollFrame(aContent, aResult);
}
return usingDisplayPort;
}
void
nsLayoutUtils::InvalidateForDisplayPortChange(nsIContent* aContent,
bool aHadDisplayPort,
const nsRect& aOldDisplayPort,
const nsRect& aNewDisplayPort,
RepaintMode aRepaintMode)
{
if (aRepaintMode != RepaintMode::Repaint) {
return;
}
bool changed = !aHadDisplayPort ||
!aOldDisplayPort.IsEqualEdges(aNewDisplayPort);
nsIFrame* frame = GetScrollFrameFromContent(aContent);
if (frame) {
frame = do_QueryFrame(frame->GetScrollTargetFrame());
}
if (changed && frame) {
// It is important to call SchedulePaint on the same frame that we set the dirty
// rect properties on so we can find the frame later to remove the properties.
frame->SchedulePaint();
if (!gfxPrefs::LayoutRetainDisplayList()) {
return;
}
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(frame);
RetainedDisplayListBuilder* retainedBuilder =
displayRoot->GetProperty(RetainedDisplayListBuilder::Cached());
if (!retainedBuilder) {
return;
}
nsRect* rect =
frame->GetProperty(nsDisplayListBuilder::DisplayListBuildingDisplayPortRect());
if (!rect) {
rect = new nsRect();
frame->SetProperty(nsDisplayListBuilder::DisplayListBuildingDisplayPortRect(), rect);
frame->SetHasOverrideDirtyRegion(true);
}
if (aHadDisplayPort) {
// We only need to build a display list for any new areas added
nsRegion newRegion(aNewDisplayPort);
newRegion.SubOut(aOldDisplayPort);
rect->UnionRect(*rect, newRegion.GetBounds());
} else {
rect->UnionRect(*rect, aNewDisplayPort);
}
}
}
bool
nsLayoutUtils::SetDisplayPortMargins(nsIContent* aContent,
nsIPresShell* aPresShell,
const ScreenMargin& aMargins,
uint32_t aPriority,
RepaintMode aRepaintMode)
{
MOZ_ASSERT(aContent);
MOZ_ASSERT(aContent->GetComposedDoc() == aPresShell->GetDocument());
DisplayPortMarginsPropertyData* currentData =
static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
if (currentData && currentData->mPriority > aPriority) {
return false;
}
nsRect oldDisplayPort;
bool hadDisplayPort = GetHighResolutionDisplayPort(aContent, &oldDisplayPort);
aContent->SetProperty(nsGkAtoms::DisplayPortMargins,
new DisplayPortMarginsPropertyData(
aMargins, aPriority),
nsINode::DeleteProperty<DisplayPortMarginsPropertyData>);
nsRect newDisplayPort;
DebugOnly<bool> hasDisplayPort = GetHighResolutionDisplayPort(aContent, &newDisplayPort);
MOZ_ASSERT(hasDisplayPort);
if (gfxPrefs::LayoutUseContainersForRootFrames()) {
nsIFrame* rootScrollFrame = aPresShell->GetRootScrollFrame();
if (rootScrollFrame &&
aContent == rootScrollFrame->GetContent() &&
nsLayoutUtils::UsesAsyncScrolling(rootScrollFrame))
{
// We are setting a root displayport for a document.
// If we have APZ, then set a special flag on the pres shell so
// that we don't get scrollbars drawn.
aPresShell->SetIgnoreViewportScrolling(true);
}
}
InvalidateForDisplayPortChange(aContent, hadDisplayPort, oldDisplayPort,
newDisplayPort, aRepaintMode);
nsIFrame* frame = GetScrollFrameFromContent(aContent);
nsIScrollableFrame* scrollableFrame = frame ? frame->GetScrollTargetFrame() : nullptr;
if (!scrollableFrame) {
return true;
}
scrollableFrame->TriggerDisplayPortExpiration();
// Display port margins changing means that the set of visible frames may
// have drastically changed. Check if we should schedule an update.
hadDisplayPort =
scrollableFrame->GetDisplayPortAtLastApproximateFrameVisibilityUpdate(&oldDisplayPort);
bool needVisibilityUpdate = !hadDisplayPort;
// Check if the total size has changed by a large factor.
if (!needVisibilityUpdate) {
if ((newDisplayPort.width > 2 * oldDisplayPort.width) ||
(oldDisplayPort.width > 2 * newDisplayPort.width) ||
(newDisplayPort.height > 2 * oldDisplayPort.height) ||
(oldDisplayPort.height > 2 * newDisplayPort.height)) {
needVisibilityUpdate = true;
}
}
// Check if it's moved by a significant amount.
if (!needVisibilityUpdate) {
if (nsRect* baseData = static_cast<nsRect*>(aContent->GetProperty(nsGkAtoms::DisplayPortBase))) {
nsRect base = *baseData;
if ((std::abs(newDisplayPort.X() - oldDisplayPort.X()) > base.width) ||
(std::abs(newDisplayPort.XMost() - oldDisplayPort.XMost()) > base.width) ||
(std::abs(newDisplayPort.Y() - oldDisplayPort.Y()) > base.height) ||
(std::abs(newDisplayPort.YMost() - oldDisplayPort.YMost()) > base.height)) {
needVisibilityUpdate = true;
}
}
}
if (needVisibilityUpdate) {
aPresShell->ScheduleApproximateFrameVisibilityUpdateNow();
}
return true;
}
void
nsLayoutUtils::SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase)
{
aContent->SetProperty(nsGkAtoms::DisplayPortBase, new nsRect(aBase),
nsINode::DeleteProperty<nsRect>);
}
void
nsLayoutUtils::SetDisplayPortBaseIfNotSet(nsIContent* aContent, const nsRect& aBase)
{
if (!aContent->GetProperty(nsGkAtoms::DisplayPortBase)) {
SetDisplayPortBase(aContent, aBase);
}
}
bool
nsLayoutUtils::GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult)
{
if (gfxPrefs::UseLowPrecisionBuffer()) {
return GetDisplayPortImpl(aContent, aResult, 1.0f);
}
return false;
}
bool
nsLayoutUtils::HasCriticalDisplayPort(nsIContent* aContent)
{
return GetCriticalDisplayPort(aContent, nullptr);
}
bool
nsLayoutUtils::GetHighResolutionDisplayPort(nsIContent* aContent, nsRect* aResult)
{
if (gfxPrefs::UseLowPrecisionBuffer()) {
return GetCriticalDisplayPort(aContent, aResult);
}
return GetDisplayPort(aContent, aResult);
}
void
nsLayoutUtils::RemoveDisplayPort(nsIContent* aContent)
{
aContent->DeleteProperty(nsGkAtoms::DisplayPort);
aContent->DeleteProperty(nsGkAtoms::DisplayPortMargins);
}
nsContainerFrame*
nsLayoutUtils::LastContinuationWithChild(nsContainerFrame* aFrame)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
nsIFrame* f = aFrame->LastContinuation();
while (!f->PrincipalChildList().FirstChild() && f->GetPrevContinuation()) {
f = f->GetPrevContinuation();
}
return static_cast<nsContainerFrame*>(f);
}
//static
FrameChildListID
nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame)
{
nsIFrame::ChildListID id = nsIFrame::kPrincipalList;
MOZ_DIAGNOSTIC_ASSERT(!(aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW));
if (aChildFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
nsIFrame* pif = aChildFrame->GetPrevInFlow();
if (pif->GetParent() == aChildFrame->GetParent()) {
id = nsIFrame::kExcessOverflowContainersList;
}
else {
id = nsIFrame::kOverflowContainersList;
}
} else {
LayoutFrameType childType = aChildFrame->Type();
if (LayoutFrameType::MenuPopup == childType) {
nsIFrame* parent = aChildFrame->GetParent();
MOZ_ASSERT(parent, "nsMenuPopupFrame can't be the root frame");
if (parent) {
if (parent->IsPopupSetFrame()) {
id = nsIFrame::kPopupList;
} else {
nsIFrame* firstPopup = parent->GetChildList(nsIFrame::kPopupList).FirstChild();
MOZ_ASSERT(!firstPopup || !firstPopup->GetNextSibling(),
"We assume popupList only has one child, but it has more.");
id = firstPopup == aChildFrame
? nsIFrame::kPopupList
: nsIFrame::kPrincipalList;
}
} else {
id = nsIFrame::kPrincipalList;
}
} else if (LayoutFrameType::TableColGroup == childType) {
id = nsIFrame::kColGroupList;
} else if (aChildFrame->IsTableCaption()) {
id = nsIFrame::kCaptionList;
} else {
id = nsIFrame::kPrincipalList;
}
}
#ifdef DEBUG
// Verify that the frame is actually in that child list or in the
// corresponding overflow list.
nsContainerFrame* parent = aChildFrame->GetParent();
bool found = parent->GetChildList(id).ContainsFrame(aChildFrame);
if (!found) {
found = parent->GetChildList(nsIFrame::kOverflowList)
.ContainsFrame(aChildFrame);
MOZ_ASSERT(found, "not in child list");
}
#endif
return id;
}
static Element*
GetPseudo(const nsIContent* aContent, nsAtom* aPseudoProperty)
{
MOZ_ASSERT(aPseudoProperty == nsGkAtoms::beforePseudoProperty ||
aPseudoProperty == nsGkAtoms::afterPseudoProperty);
if (!aContent->MayHaveAnonymousChildren()) {
return nullptr;
}
return static_cast<Element*>(aContent->GetProperty(aPseudoProperty));
}
/*static*/ Element*
nsLayoutUtils::GetBeforePseudo(const nsIContent* aContent)
{
return GetPseudo(aContent, nsGkAtoms::beforePseudoProperty);
}
/*static*/ nsIFrame*
nsLayoutUtils::GetBeforeFrame(const nsIContent* aContent)
{
Element* pseudo = GetBeforePseudo(aContent);
return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}
/*static*/ Element*
nsLayoutUtils::GetAfterPseudo(const nsIContent* aContent)
{
return GetPseudo(aContent, nsGkAtoms::afterPseudoProperty);
}
/*static*/ nsIFrame*
nsLayoutUtils::GetAfterFrame(const nsIContent* aContent)
{
Element* pseudo = GetAfterPseudo(aContent);
return pseudo ? pseudo->GetPrimaryFrame() : nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame,
LayoutFrameType aFrameType,
nsIFrame* aStopAt)
{
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
if (frame->Type() == aFrameType) {
return frame;
}
if (frame == aStopAt) {
break;
}
}
return nullptr;
}
/* static */ nsIFrame*
nsLayoutUtils::GetPageFrame(nsIFrame* aFrame)
{
return GetClosestFrameOfType(aFrame, LayoutFrameType::Page);
}
// static
nsIFrame*
nsLayoutUtils::GetStyleFrame(nsIFrame* aFrame)
{
if (aFrame->IsTableWrapperFrame()) {
nsIFrame* inner = aFrame->PrincipalChildList().FirstChild();
// inner may be null, if aFrame is mid-destruction
return inner;
}
return aFrame;
}
nsIFrame*
nsLayoutUtils::GetStyleFrame(const nsIContent* aContent)
{
nsIFrame *frame = aContent->GetPrimaryFrame();
if (!frame) {
return nullptr;
}
return nsLayoutUtils::GetStyleFrame(frame);
}
/* static */ nsIFrame*
nsLayoutUtils::GetRealPrimaryFrameFor(const nsIContent* aContent)
{
nsIFrame *frame = aContent->GetPrimaryFrame();
if (!frame) {
return nullptr;
}
return nsPlaceholderFrame::GetRealFrameFor(frame);
}
nsIFrame*
nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
NS_ASSERTION(aFrame->IsPlaceholderFrame(), "Must have a placeholder here");
if (aFrame->GetStateBits() & PLACEHOLDER_FOR_FLOAT) {
nsIFrame *outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
NS_ASSERTION(outOfFlowFrame->IsFloating(),
"How did that happen?");
return outOfFlowFrame;
}
return nullptr;
}
// static
nsIFrame*
nsLayoutUtils::GetCrossDocParentFrame(const nsIFrame* aFrame,
nsPoint* aExtraOffset)
{
nsIFrame* p = aFrame->GetParent();
if (p)
return p;
nsView* v = aFrame->GetView();
if (!v)
return nullptr;
v = v->GetParent(); // anonymous inner view
if (!v)
return nullptr;
if (aExtraOffset) {
*aExtraOffset += v->GetPosition();
}
v = v->GetParent(); // subdocumentframe's view
return v ? v->GetFrame() : nullptr;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
return IsAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
}
// static
bool
nsLayoutUtils::IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
const nsIFrame* aCommonAncestor)
{
for (const nsIFrame* f = aFrame; f != aCommonAncestor;
f = GetCrossDocParentFrame(f)) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
bool
nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
nsIFrame* aCommonAncestor)
{
if (aFrame == aAncestorFrame)
return false;
for (nsIFrame* f = aFrame; f != aCommonAncestor; f = f->GetParent()) {
if (f == aAncestorFrame)
return true;
}
return aCommonAncestor == aAncestorFrame;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
const nsIContent* aCommonAncestor)
{
NS_PRECONDITION(aContent1, "aContent1 must not be null");
NS_PRECONDITION(aContent2, "aContent2 must not be null");
AutoTArray<nsINode*, 32> content1Ancestors;
nsINode* c1;
for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetParentNode()) {
content1Ancestors.AppendElement(c1);
}
if (!c1 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c1. Oops.
// Never mind. We can continue as if aCommonAncestor was null.
aCommonAncestor = nullptr;
}
AutoTArray<nsINode*, 32> content2Ancestors;
nsINode* c2;
for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetParentNode()) {
content2Ancestors.AppendElement(c2);
}
if (!c2 && aCommonAncestor) {
// So, it turns out aCommonAncestor was not an ancestor of c2.
// We need to retry with no common ancestor hint.
return DoCompareTreePosition(aContent1, aContent2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int last1 = content1Ancestors.Length() - 1;
int last2 = content2Ancestors.Length() - 1;
nsINode* content1Ancestor = nullptr;
nsINode* content2Ancestor = nullptr;
while (last1 >= 0 && last2 >= 0
&& ((content1Ancestor = content1Ancestors.ElementAt(last1)) ==
(content2Ancestor = content2Ancestors.ElementAt(last2)))) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aContent1 == aContent2, "internal error?");
return 0;
}
// aContent1 is an ancestor of aContent2
return aIf1Ancestor;
}
if (last2 < 0) {
// aContent2 is an ancestor of aContent1
return aIf2Ancestor;
}
// content1Ancestor != content2Ancestor, so they must be siblings with the same parent
nsINode* parent = content1Ancestor->GetParentNode();
#ifdef DEBUG
// TODO: remove the uglyness, see bug 598468.
NS_ASSERTION(gPreventAssertInCompareTreePosition || parent,
"no common ancestor at all???");
#endif // DEBUG
if (!parent) { // different documents??
return 0;
}
int32_t index1 = parent->IndexOf(content1Ancestor);
int32_t index2 = parent->IndexOf(content2Ancestor);
if (index1 < 0 || index2 < 0) {
// one of them must be anonymous; we can't determine the order
return 0;
}
return index1 - index2;
}
// static
nsIFrame*
nsLayoutUtils::FillAncestors(nsIFrame* aFrame,
nsIFrame* aStopAtAncestor,
nsTArray<nsIFrame*>* aAncestors)
{
while (aFrame && aFrame != aStopAtAncestor) {
aAncestors->AppendElement(aFrame);
aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
}
return aFrame;
}
// Return true if aFrame1 is after aFrame2
static bool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsIFrame* f = aFrame2;
do {
f = f->GetNextSibling();
if (f == aFrame1)
return true;
} while (f);
return false;
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
nsIFrame* aCommonAncestor)
{
NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
AutoTArray<nsIFrame*,20> frame2Ancestors;
nsIFrame* nonCommonAncestor =
FillAncestors(aFrame2, aCommonAncestor, &frame2Ancestors);
return DoCompareTreePosition(aFrame1, aFrame2, frame2Ancestors,
aIf1Ancestor, aIf2Ancestor,
nonCommonAncestor ? aCommonAncestor : nullptr);
}
// static
int32_t
nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
nsTArray<nsIFrame*>& aFrame2Ancestors,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
nsIFrame* aCommonAncestor)
{
NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
nsPresContext* presContext = aFrame1->PresContext();
if (presContext != aFrame2->PresContext()) {
NS_ERROR("no common ancestor at all, different documents");
return 0;
}
AutoTArray<nsIFrame*,20> frame1Ancestors;
if (aCommonAncestor &&
!FillAncestors(aFrame1, aCommonAncestor, &frame1Ancestors)) {
// We reached the root of the frame tree ... if aCommonAncestor was set,
// it is wrong
return DoCompareTreePosition(aFrame1, aFrame2,
aIf1Ancestor, aIf2Ancestor, nullptr);
}
int32_t last1 = int32_t(frame1Ancestors.Length()) - 1;
int32_t last2 = int32_t(aFrame2Ancestors.Length()) - 1;
while (last1 >= 0 && last2 >= 0 &&
frame1Ancestors[last1] == aFrame2Ancestors[last2]) {
last1--;
last2--;
}
if (last1 < 0) {
if (last2 < 0) {
NS_ASSERTION(aFrame1 == aFrame2, "internal error?");
return 0;
}
// aFrame1 is an ancestor of aFrame2
return aIf1Ancestor;
}
if (last2 < 0) {
// aFrame2 is an ancestor of aFrame1
return aIf2Ancestor;
}
nsIFrame* ancestor1 = frame1Ancestors[last1];
nsIFrame* ancestor2 = aFrame2Ancestors[last2];
// Now we should be able to walk sibling chains to find which one is first
if (IsFrameAfter(ancestor2, ancestor1))
return -1;
if (IsFrameAfter(ancestor1, ancestor2))
return 1;
NS_WARNING("Frames were in different child lists???");
return 0;
}
// static
nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
if (!aFrame) {
return nullptr;
}
nsIFrame* next;
while ((next = aFrame->GetNextSibling()) != nullptr) {
aFrame = next;
}
return aFrame;
}
// static
nsView*
nsLayoutUtils::FindSiblingViewFor(nsView* aParentView, nsIFrame* aFrame) {
nsIFrame* parentViewFrame = aParentView->GetFrame();
nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nullptr;
for (nsView* insertBefore = aParentView->GetFirstChild(); insertBefore;
insertBefore = insertBefore->GetNextSibling()) {
nsIFrame* f = insertBefore->GetFrame();
if (!f) {
// this view could be some anonymous view attached to a meaningful parent
for (nsView* searchView = insertBefore->GetParent(); searchView;
searchView = searchView->GetParent()) {
f = searchView->GetFrame();
if (f) {
break;
}
}
NS_ASSERTION(f, "Can't find a frame anywhere!");
}
if (!f || !aFrame->GetContent() || !f->GetContent() ||
CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
// aFrame's content is after f's content (or we just don't know),
// so put our view before f's view
return insertBefore;
}
}
return nullptr;
}
//static
nsIScrollableFrame*
nsLayoutUtils::GetScrollableFrameFor(const nsIFrame *aScrolledFrame)
{
nsIFrame *frame = aScrolledFrame->GetParent();
nsIScrollableFrame *sf = do_QueryFrame(frame);
return (sf && sf->GetScrolledFrame() == aScrolledFrame) ? sf : nullptr;
}
/* static */ void
nsLayoutUtils::SetFixedPositionLayerData(Layer* aLayer,
const nsIFrame* aViewportFrame,
const nsRect& aAnchorRect,
const nsIFrame* aFixedPosFrame,
nsPresContext* aPresContext,
const ContainerLayerParameters& aContainerParameters) {
// Find out the rect of the viewport frame relative to the reference frame.
// This, in conjunction with the container scale, will correspond to the
// coordinate-space of the built layer.
float factor = aPresContext->AppUnitsPerDevPixel();
Rect anchorRect(NSAppUnitsToFloatPixels(aAnchorRect.x, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(aAnchorRect.y, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(aAnchorRect.width, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(aAnchorRect.height, factor) *
aContainerParameters.mYScale);
// Need to transform anchorRect from the container layer's coordinate system
// into aLayer's coordinate system.
Matrix transform2d;
if (aLayer->GetTransform().Is2D(&transform2d)) {
transform2d.Invert();
anchorRect = transform2d.TransformBounds(anchorRect);
} else {
NS_ERROR("3D transform found between fixedpos content and its viewport (should never happen)");
anchorRect = Rect(0,0,0,0);
}
// Work out the anchor point for this fixed position layer. We assume that
// any positioning set (left/top/right/bottom) indicates that the
// corresponding side of its container should be the anchor point,
// defaulting to top-left.
LayerPoint anchor(anchorRect.x, anchorRect.y);
int32_t sides = eSideBitsNone;
if (aFixedPosFrame != aViewportFrame) {
const nsStylePosition* position = aFixedPosFrame->StylePosition();
if (position->mOffset.GetRightUnit() != eStyleUnit_Auto) {
sides |= eSideBitsRight;
if (position->mOffset.GetLeftUnit() != eStyleUnit_Auto) {
sides |= eSideBitsLeft;
anchor.x = anchorRect.x + anchorRect.width / 2.f;
} else {
anchor.x = anchorRect.XMost();
}
} else if (position->mOffset.GetLeftUnit() != eStyleUnit_Auto) {
sides |= eSideBitsLeft;
}
if (position->mOffset.GetBottomUnit() != eStyleUnit_Auto) {
sides |= eSideBitsBottom;
if (position->mOffset.GetTopUnit() != eStyleUnit_Auto) {
sides |= eSideBitsTop;
anchor.y = anchorRect.y + anchorRect.height / 2.f;
} else {
anchor.y = anchorRect.YMost();
}
} else if (position->mOffset.GetTopUnit() != eStyleUnit_Auto) {
sides |= eSideBitsTop;
}
}
ViewID id = ScrollIdForRootScrollFrame(aPresContext);
aLayer->SetFixedPositionData(id, anchor, sides);
}
FrameMetrics::ViewID
nsLayoutUtils::ScrollIdForRootScrollFrame(nsPresContext* aPresContext)
{
ViewID id = FrameMetrics::NULL_SCROLL_ID;
if (nsIFrame* rootScrollFrame = aPresContext->PresShell()->GetRootScrollFrame()) {
if (nsIContent* content = rootScrollFrame->GetContent()) {
id = FindOrCreateIDFor(content);
}
}
return id;
}
bool
nsLayoutUtils::ViewportHasDisplayPort(nsPresContext* aPresContext)
{
nsIFrame* rootScrollFrame =
aPresContext->PresShell()->GetRootScrollFrame();
return rootScrollFrame &&
nsLayoutUtils::HasDisplayPort(rootScrollFrame->GetContent());
}
bool
nsLayoutUtils::IsFixedPosFrameInDisplayPort(const nsIFrame* aFrame)
{
// Fixed-pos frames are parented by the viewport frame or the page content frame.
// We'll assume that printing/print preview don't have displayports for their
// pages!
nsIFrame* parent = aFrame->GetParent();
if (!parent || parent->GetParent() ||
aFrame->StyleDisplay()->mPosition != NS_STYLE_POSITION_FIXED) {
return false;
}
return ViewportHasDisplayPort(aFrame->PresContext());
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
Direction aDirection)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
uint32_t directions = scrollableFrame->GetPerceivedScrollingDirections();
if (aDirection == eVertical ?
(ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::VERTICAL)) :
(ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
(directions & nsIScrollableFrame::HORIZONTAL)))
return scrollableFrame;
}
}
return nullptr;
}
// static
nsIScrollableFrame*
nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame, uint32_t aFlags)
{
NS_ASSERTION(aFrame, "GetNearestScrollableFrame expects a non-null frame");
for (nsIFrame* f = aFrame; f; f = (aFlags & SCROLLABLE_SAME_DOC) ?
f->GetParent() : nsLayoutUtils::GetCrossDocParentFrame(f)) {
nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
if (scrollableFrame) {
if (aFlags & SCROLLABLE_ONLY_ASYNC_SCROLLABLE) {
if (scrollableFrame->WantAsyncScroll()) {
return scrollableFrame;
}
} else {
ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
if ((aFlags & SCROLLABLE_INCLUDE_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) {
return scrollableFrame;
}
}
if (aFlags & SCROLLABLE_ALWAYS_MATCH_ROOT) {
nsIPresShell* ps = f->PresShell();
if (ps->GetRootScrollFrame() == f &&
ps->GetDocument() && ps->GetDocument()->IsRootDisplayDocument()) {
return scrollableFrame;
}
}
}
if ((aFlags & SCROLLABLE_FIXEDPOS_FINDS_ROOT) &&
f->StyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED &&
nsLayoutUtils::IsReallyFixedPos(f)) {
return f->PresShell()->GetRootScrollFrameAsScrollable();
}
}
return nullptr;
}
// static
nsRect
nsLayoutUtils::GetScrolledRect(nsIFrame* aScrolledFrame,
const nsRect& aScrolledFrameOverflowArea,
const nsSize& aScrollPortSize,
uint8_t aDirection)
{
WritingMode wm = aScrolledFrame->GetWritingMode();
// Potentially override the frame's direction to use the direction found
// by ScrollFrameHelper::GetScrolledFrameDir()
wm.SetDirectionFromBidiLevel(aDirection == NS_STYLE_DIRECTION_RTL ? 1 : 0);
nscoord x1 = aScrolledFrameOverflowArea.x,
x2 = aScrolledFrameOverflowArea.XMost(),
y1 = aScrolledFrameOverflowArea.y,
y2 = aScrolledFrameOverflowArea.YMost();
bool horizontal = !wm.IsVertical();
// Clamp the horizontal start-edge (x1 or x2, depending whether the logical
// axis that corresponds to horizontal progresses from L-R or R-L).
// In horizontal writing mode, we need to check IsInlineReversed() to see
// which side to clamp; in vertical mode, it depends on the block direction.
if ((horizontal && !wm.IsInlineReversed()) || wm.IsVerticalLR()) {
if (x1 < 0) {
x1 = 0;
}
} else {
if (x2 > aScrollPortSize.width) {
x2 = aScrollPortSize.width;
}
// When the scrolled frame chooses a size larger than its available width
// (because its padding alone is larger than the available width), we need
// to keep the start-edge of the scroll frame anchored to the start-edge of
// the scrollport.
// When the scrolled frame is RTL, this means moving it in our left-based
// coordinate system, so we need to compensate for its extra width here by
// effectively repositioning the frame.
nscoord extraWidth =
std::max(0, aScrolledFrame->GetSize().width - aScrollPortSize.width);
x2 += extraWidth;
}
// Similarly, clamp the vertical start-edge.
// In horizontal writing mode, the block direction is always top-to-bottom;
// in vertical writing mode, we need to check IsInlineReversed().
if (horizontal || !wm.IsInlineReversed()) {
if (y1 < 0) {
y1 = 0;
}
} else {
if (y2 > aScrollPortSize.height) {
y2 = aScrollPortSize.height;
}
nscoord extraHeight =
std::max(0, aScrolledFrame->GetSize().height - aScrollPortSize.height);
y2 += extraHeight;
}
return nsRect(x1, y1, x2 - x1, y2 - y1);
}
//static
bool
nsLayoutUtils::HasPseudoStyle(nsIContent* aContent,
nsStyleContext* aStyleContext,
CSSPseudoElementType aPseudoElement,
nsPresContext* aPresContext)
{
NS_PRECONDITION(aPresContext, "Must have a prescontext");
RefPtr<nsStyleContext> pseudoContext;
if (aContent) {
pseudoContext = aPresContext->StyleSet()->
ProbePseudoElementStyle(aContent->AsElement(), aPseudoElement,
aStyleContext);
}
return pseudoContext != nullptr;
}
nsPoint
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
{
if (!aDOMEvent)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
WidgetEvent* event = aDOMEvent->WidgetEventPtr();
if (!event)
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(event, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
nsIFrame* aFrame)
{
if (!aEvent || (aEvent->mClass != eMouseEventClass &&
aEvent->mClass != eMouseScrollEventClass &&
aEvent->mClass != eWheelEventClass &&
aEvent->mClass != eDragEventClass &&
aEvent->mClass != eSimpleGestureEventClass &&
aEvent->mClass != ePointerEventClass &&
aEvent->mClass != eGestureNotifyEventClass &&
aEvent->mClass != eTouchEventClass &&
aEvent->mClass != eQueryContentEventClass))
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
return GetEventCoordinatesRelativeTo(aEvent,
aEvent->AsGUIEvent()->mRefPoint,
aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
const LayoutDeviceIntPoint& aPoint,
nsIFrame* aFrame)
{
if (!aFrame) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsIWidget* widget = aEvent->AsGUIEvent()->mWidget;
if (!widget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
return GetEventCoordinatesRelativeTo(widget, aPoint, aFrame);
}
nsPoint
nsLayoutUtils::GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
const LayoutDeviceIntPoint& aPoint,
nsIFrame* aFrame)
{
if (!aFrame || !aWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsView* view = aFrame->GetView();
if (view) {
nsIWidget* frameWidget = view->GetWidget();
if (frameWidget && frameWidget == aWidget) {
// Special case this cause it happens a lot.
// This also fixes bug 664707, events in the extra-special case of select
// dropdown popups that are transformed.
nsPresContext* presContext = aFrame->PresContext();
nsPoint pt(presContext->DevPixelsToAppUnits(aPoint.x),
presContext->DevPixelsToAppUnits(aPoint.y));
pt = pt - view->ViewToWidgetOffset();
pt = pt.RemoveResolution(GetCurrentAPZResolutionScale(presContext->PresShell()));
return pt;
}
}
/* If we walk up the frame tree and discover that any of the frames are
* transformed, we need to do extra work to convert from the global
* space to the local space.
*/
nsIFrame* rootFrame = aFrame;
bool transformFound = false;
for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
if (f->IsTransformed()) {
transformFound = true;
}
rootFrame = f;
}
nsView* rootView = rootFrame->GetView();
if (!rootView) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsPoint widgetToView = TranslateWidgetToView(rootFrame->PresContext(),
aWidget, aPoint, rootView);
if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
// Convert from root document app units to app units of the document aFrame
// is in.
int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
int32_t localAPD = aFrame->PresContext()->AppUnitsPerDevPixel();
widgetToView = widgetToView.ScaleToOtherAppUnits(rootAPD, localAPD);
nsIPresShell* shell = aFrame->PresShell();
// XXX Bug 1224748 - Update nsLayoutUtils functions to correctly handle nsPresShell resolution
widgetToView = widgetToView.RemoveResolution(GetCurrentAPZResolutionScale(shell));
/* If we encountered a transform, we can't do simple arithmetic to figure
* out how to convert back to aFrame's coordinates and must use the CTM.
*/
if (transformFound || nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
return TransformRootPointToFrame(aFrame, widgetToView);
}
/* Otherwise, all coordinate systems are translations of one another,
* so we can just subtract out the difference.
*/
return widgetToView - aFrame->GetOffsetToCrossDoc(rootFrame);
}
nsIFrame*
nsLayoutUtils::GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
const WidgetEvent* aEvent)
{
#ifdef MOZ_XUL
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (!pm) {
return nullptr;
}
nsTArray<nsIFrame*> popups;
pm->GetVisiblePopups(popups);
uint32_t i;
// Search from top to bottom
for (i = 0; i < popups.Length(); i++) {
nsIFrame* popup = popups[i];
if (popup->PresContext()->GetRootPresContext() == aPresContext &&
popup->GetScrollableOverflowRect().Contains(
GetEventCoordinatesRelativeTo(aEvent, popup))) {
return popup;
}
}
#endif
return nullptr;
}
static void ConstrainToCoordValues(float& aStart, float& aSize)
{
MOZ_ASSERT(aSize >= 0);
// Here we try to make sure that the resulting nsRect will continue to cover
// as much of the area that was covered by the original gfx Rect as possible.
// We clamp the bounds of the rect to {nscoord_MIN,nscoord_MAX} since
// nsRect::X/Y() and nsRect::XMost/YMost() can't return values outwith this
// range:
float end = aStart + aSize;
aStart = clamped(aStart, float(nscoord_MIN), float(nscoord_MAX));
end = clamped(end, float(nscoord_MIN), float(nscoord_MAX));
aSize = end - aStart;
// We must also clamp aSize to {0,nscoord_MAX} since nsRect::Width/Height()
// can't return a value greater than nscoord_MAX. If aSize is greater than
// nscoord_MAX then we reduce it to nscoord_MAX while keeping the rect
// centered:
if (aSize > nscoord_MAX) {
float excess = aSize - nscoord_MAX;
excess /= 2;
aStart += excess;
aSize = (float)nscoord_MAX;
}
}
/**
* Given a gfxFloat, constrains its value to be between nscoord_MIN and nscoord_MAX.
*
* @param aVal The value to constrain (in/out)
*/
static void ConstrainToCoordValues(gfxFloat& aVal)
{
if (aVal <= nscoord_MIN)
aVal = nscoord_MIN;
else if (aVal >= nscoord_MAX)
aVal = nscoord_MAX;
}
static void ConstrainToCoordValues(gfxFloat& aStart, gfxFloat& aSize)
{
gfxFloat max = aStart + aSize;
// Clamp the end points to within nscoord range
ConstrainToCoordValues(aStart);
ConstrainToCoordValues(max);
aSize = max - aStart;
// If the width if still greater than the max nscoord, then bring both
// endpoints in by the same amount until it fits.
if (aSize > nscoord_MAX) {
gfxFloat excess = aSize - nscoord_MAX;
excess /= 2;
aStart += excess;
aSize = nscoord_MAX;
} else if (aSize < nscoord_MIN) {
gfxFloat excess = aSize - nscoord_MIN;
excess /= 2;
aStart -= excess;
aSize = nscoord_MIN;
}
}
nsRect
nsLayoutUtils::RoundGfxRectToAppRect(const Rect &aRect, float aFactor)
{
/* Get a new Rect whose units are app units by scaling by the specified factor. */
Rect scaledRect = aRect;
scaledRect.ScaleRoundOut(aFactor);
/* We now need to constrain our results to the max and min values for coords. */
ConstrainToCoordValues(scaledRect.x, scaledRect.width);
ConstrainToCoordValues(scaledRect.y, scaledRect.height);
/* Now typecast everything back. This is guaranteed to be safe. */
return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
}
nsRect
nsLayoutUtils::RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor)
{
/* Get a new gfxRect whose units are app units by scaling by the specified factor. */
gfxRect scaledRect = aRect;
scaledRect.ScaleRoundOut(aFactor);
/* We now need to constrain our results to the max and min values for coords. */
ConstrainToCoordValues(scaledRect.x, scaledRect.width);
ConstrainToCoordValues(scaledRect.y, scaledRect.height);
/* Now typecast everything back. This is guaranteed to be safe. */
return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
}
nsRegion
nsLayoutUtils::RoundedRectIntersectRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect)
{
// rectFullHeight and rectFullWidth together will approximately contain
// the total area of the frame minus the rounded corners.
nsRect rectFullHeight = aRoundedRect;
nscoord xDiff = std::max(aRadii[eCornerTopLeftX], aRadii[eCornerBottomLeftX]);
rectFullHeight.x += xDiff;
rectFullHeight.width -= std::max(aRadii[eCornerTopRightX],
aRadii[eCornerBottomRightX]) + xDiff;
nsRect r1;
r1.IntersectRect(rectFullHeight, aContainedRect);
nsRect rectFullWidth = aRoundedRect;
nscoord yDiff = std::max(aRadii[eCornerTopLeftY], aRadii[eCornerTopRightY]);
rectFullWidth.y += yDiff;
rectFullWidth.height -= std::max(aRadii[eCornerBottomLeftY],
aRadii[eCornerBottomRightY]) + yDiff;
nsRect r2;
r2.IntersectRect(rectFullWidth, aContainedRect);
nsRegion result;
result.Or(r1, r2);
return result;
}
nsIntRegion
nsLayoutUtils::RoundedRectIntersectIntRect(const nsIntRect& aRoundedRect,
const RectCornerRadii& aCornerRadii,
const nsIntRect& aContainedRect)
{
// rectFullHeight and rectFullWidth together will approximately contain
// the total area of the frame minus the rounded corners.
nsIntRect rectFullHeight = aRoundedRect;
uint32_t xDiff = std::max(aCornerRadii.TopLeft().width,
aCornerRadii.BottomLeft().width);
rectFullHeight.x += xDiff;
rectFullHeight.width -= std::max(aCornerRadii.TopRight().width,
aCornerRadii.BottomRight().width) + xDiff;
nsIntRect r1;
r1.IntersectRect(rectFullHeight, aContainedRect);
nsIntRect rectFullWidth = aRoundedRect;
uint32_t yDiff = std::max(aCornerRadii.TopLeft().height,
aCornerRadii.TopRight().height);
rectFullWidth.y += yDiff;
rectFullWidth.height -= std::max(aCornerRadii.BottomLeft().height,
aCornerRadii.BottomRight().height) + yDiff;
nsIntRect r2;
r2.IntersectRect(rectFullWidth, aContainedRect);
nsIntRegion result;
result.Or(r1, r2);
return result;
}
// Helper for RoundedRectIntersectsRect.
static bool
CheckCorner(nscoord aXOffset, nscoord aYOffset,
nscoord aXRadius, nscoord aYRadius)
{
MOZ_ASSERT(aXOffset > 0 && aYOffset > 0,
"must not pass nonpositives to CheckCorner");
MOZ_ASSERT(aXRadius >= 0 && aYRadius >= 0,
"must not pass negatives to CheckCorner");
// Avoid floating point math unless we're either (1) within the
// quarter-ellipse area at the rounded corner or (2) outside the
// rounding.
if (aXOffset >= aXRadius || aYOffset >= aYRadius)
return true;
// Convert coordinates to a unit circle with (0,0) as the center of
// curvature, and see if we're inside the circle or outside.
float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
return scaledX * scaledX + scaledY * scaledY < 1.0f;
}
bool
nsLayoutUtils::RoundedRectIntersectsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aTestRect)
{
if (!aTestRect.Intersects(aRoundedRect))
return false;
// distances from this edge of aRoundedRect to opposite edge of aTestRect,
// which we know are positive due to the Intersects check above.
nsMargin insets;
insets.top = aTestRect.YMost() - aRoundedRect.y;
insets.right = aRoundedRect.XMost() - aTestRect.x;
insets.bottom = aRoundedRect.YMost() - aTestRect.y;
insets.left = aTestRect.XMost() - aRoundedRect.x;
// Check whether the bottom-right corner of aTestRect is inside the
// top left corner of aBounds when rounded by aRadii, etc. If any
// corner is not, then fail; otherwise succeed.
return CheckCorner(insets.left, insets.top,
aRadii[eCornerTopLeftX],
aRadii[eCornerTopLeftY]) &&
CheckCorner(insets.right, insets.top,
aRadii[eCornerTopRightX],
aRadii[eCornerTopRightY]) &&
CheckCorner(insets.right, insets.bottom,
aRadii[eCornerBottomRightX],
aRadii[eCornerBottomRightY]) &&
CheckCorner(insets.left, insets.bottom,
aRadii[eCornerBottomLeftX],
aRadii[eCornerBottomLeftY]);
}
nsRect
nsLayoutUtils::MatrixTransformRect(const nsRect &aBounds,
const Matrix4x4 &aMatrix, float aFactor)
{
RectDouble image = RectDouble(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
NSAppUnitsToDoublePixels(aBounds.y, aFactor),
NSAppUnitsToDoublePixels(aBounds.width, aFactor),
NSAppUnitsToDoublePixels(aBounds.height, aFactor));
RectDouble maxBounds = RectDouble(double(nscoord_MIN) / aFactor * 0.5,
double(nscoord_MIN) / aFactor * 0.5,
double(nscoord_MAX) / aFactor,
double(nscoord_MAX) / aFactor);
image = aMatrix.TransformAndClipBounds(image, maxBounds);
return RoundGfxRectToAppRect(ThebesRect(image), aFactor);
}
nsPoint
nsLayoutUtils::MatrixTransformPoint(const nsPoint &aPoint,
const Matrix4x4 &aMatrix, float aFactor)
{
gfxPoint image = gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, aFactor),
NSAppUnitsToFloatPixels(aPoint.y, aFactor));
image = aMatrix.TransformPoint(image);
return nsPoint(NSFloatPixelsToAppUnits(float(image.x), aFactor),
NSFloatPixelsToAppUnits(float(image.y), aFactor));
}
void
nsLayoutUtils::PostTranslate(Matrix4x4& aTransform, const nsPoint& aOrigin, float aAppUnitsPerPixel, bool aRounded)
{
Point3D gfxOrigin =
Point3D(NSAppUnitsToFloatPixels(aOrigin.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aOrigin.y, aAppUnitsPerPixel),
0.0f);
if (aRounded) {
gfxOrigin.x = NS_round(gfxOrigin.x);
gfxOrigin.y = NS_round(gfxOrigin.y);
}
aTransform.PostTranslate(gfxOrigin);
}
// We want to this return true for the scroll frame, but not the
// scrolled frame (which has the same content).
bool
nsLayoutUtils::FrameHasDisplayPort(nsIFrame* aFrame, nsIFrame* aScrolledFrame)
{
if (!aFrame->GetContent() || !HasDisplayPort(aFrame->GetContent())) {
return false;
}
nsIScrollableFrame* sf = do_QueryFrame(aFrame);
if (sf) {
if (aScrolledFrame && aScrolledFrame != sf->GetScrolledFrame()) {
return false;
}
return true;
}
return false;
}
Matrix4x4
nsLayoutUtils::GetTransformToAncestor(nsIFrame *aFrame,
const nsIFrame *aAncestor,
uint32_t aFlags,
nsIFrame** aOutAncestor)
{
nsIFrame* parent;
Matrix4x4 ctm;
if (aFrame == aAncestor) {
return ctm;
}
ctm = aFrame->GetTransformMatrix(aAncestor, &parent, aFlags);
while (parent && parent != aAncestor &&
(!(aFlags & nsIFrame::STOP_AT_STACKING_CONTEXT_AND_DISPLAY_PORT) ||
(!parent->IsStackingContext() && !FrameHasDisplayPort(parent)))) {
if (!parent->Extend3DContext()) {
ctm.ProjectTo2D();
}
ctm = ctm * parent->GetTransformMatrix(aAncestor, &parent, aFlags);
}
if (aOutAncestor) {
*aOutAncestor = parent;
}
return ctm;
}
gfxSize
nsLayoutUtils::GetTransformToAncestorScale(nsIFrame* aFrame)
{
Matrix4x4 transform = GetTransformToAncestor(aFrame,
nsLayoutUtils::GetDisplayRootFrame(aFrame));
Matrix transform2D;
if (transform.Is2D(&transform2D)) {
return ThebesMatrix(transform2D).ScaleFactors(true);
}
return gfxSize(1, 1);
}
static Matrix4x4
GetTransformToAncestorExcludingAnimated(nsIFrame* aFrame,
const nsIFrame* aAncestor)
{
nsIFrame* parent;
Matrix4x4 ctm;
if (aFrame == aAncestor) {
return ctm;
}
if (ActiveLayerTracker::IsScaleSubjectToAnimation(aFrame)) {
return ctm;
}
ctm = aFrame->GetTransformMatrix(aAncestor, &parent);
while (parent && parent != aAncestor) {
if (ActiveLayerTracker::IsScaleSubjectToAnimation(parent)) {
return Matrix4x4();
}
if (!parent->Extend3DContext()) {
ctm.ProjectTo2D();
}
ctm = ctm * parent->GetTransformMatrix(aAncestor, &parent);
}
return ctm;
}
gfxSize
nsLayoutUtils::GetTransformToAncestorScaleExcludingAnimated(nsIFrame* aFrame)
{
Matrix4x4 transform = GetTransformToAncestorExcludingAnimated(aFrame,
nsLayoutUtils::GetDisplayRootFrame(aFrame));
Matrix transform2D;
if (transform.Is2D(&transform2D)) {
return ThebesMatrix(transform2D).ScaleFactors(true);
}
return gfxSize(1, 1);
}
nsIFrame*
nsLayoutUtils::FindNearestCommonAncestorFrame(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
AutoTArray<nsIFrame*,100> ancestors1;
AutoTArray<nsIFrame*,100> ancestors2;
nsIFrame* commonAncestor = nullptr;
if (aFrame1->PresContext() == aFrame2->PresContext()) {
commonAncestor = aFrame1->PresShell()->GetRootFrame();
}
for (nsIFrame* f = aFrame1; f != commonAncestor;
f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
ancestors1.AppendElement(f);
}
for (nsIFrame* f = aFrame2; f != commonAncestor;
f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
ancestors2.AppendElement(f);
}
uint32_t minLengths = std::min(ancestors1.Length(), ancestors2.Length());
for (uint32_t i = 1; i <= minLengths; ++i) {
if (ancestors1[ancestors1.Length() - i] == ancestors2[ancestors2.Length() - i]) {
commonAncestor = ancestors1[ancestors1.Length() - i];
} else {
break;
}
}
return commonAncestor;
}
nsLayoutUtils::TransformResult
nsLayoutUtils::TransformPoints(nsIFrame* aFromFrame, nsIFrame* aToFrame,
uint32_t aPointCount, CSSPoint* aPoints)
{
nsIFrame* nearestCommonAncestor = FindNearestCommonAncestorFrame(aFromFrame, aToFrame);
if (!nearestCommonAncestor) {
return NO_COMMON_ANCESTOR;
}
Matrix4x4 downToDest = GetTransformToAncestor(aToFrame, nearestCommonAncestor);
if (downToDest.IsSingular()) {
return NONINVERTIBLE_TRANSFORM;
}
downToDest.Invert();
Matrix4x4 upToAncestor = GetTransformToAncestor(aFromFrame, nearestCommonAncestor);
CSSToLayoutDeviceScale devPixelsPerCSSPixelFromFrame =
aFromFrame->PresContext()->CSSToDevPixelScale();
CSSToLayoutDeviceScale devPixelsPerCSSPixelToFrame =
aToFrame->PresContext()->CSSToDevPixelScale();
for (uint32_t i = 0; i < aPointCount; ++i) {
LayoutDevicePoint devPixels = aPoints[i] * devPixelsPerCSSPixelFromFrame;
// What should the behaviour be if some of the points aren't invertible
// and others are? Just assume all points are for now.
Point toDevPixels = downToDest.ProjectPoint(
(upToAncestor.TransformPoint(Point(devPixels.x, devPixels.y)))).As2DPoint();
// Divide here so that when the devPixelsPerCSSPixels are the same, we get the correct
// answer instead of some inaccuracy multiplying a number by its reciprocal.
aPoints[i] = LayoutDevicePoint(toDevPixels.x, toDevPixels.y) /
devPixelsPerCSSPixelToFrame;
}
return TRANSFORM_SUCCEEDED;
}
nsLayoutUtils::TransformResult
nsLayoutUtils::TransformPoint(nsIFrame* aFromFrame, nsIFrame* aToFrame,
nsPoint& aPoint)
{
nsIFrame* nearestCommonAncestor = FindNearestCommonAncestorFrame(aFromFrame, aToFrame);
if (!nearestCommonAncestor) {
return NO_COMMON_ANCESTOR;
}
Matrix4x4 downToDest = GetTransformToAncestor(aToFrame, nearestCommonAncestor);
if (downToDest.IsSingular()) {
return NONINVERTIBLE_TRANSFORM;
}
downToDest.Invert();
Matrix4x4 upToAncestor = GetTransformToAncestor(aFromFrame, nearestCommonAncestor);
float devPixelsPerAppUnitFromFrame =
1.0f / aFromFrame->PresContext()->AppUnitsPerDevPixel();
float devPixelsPerAppUnitToFrame =
1.0f / aToFrame->PresContext()->AppUnitsPerDevPixel();
Point4D toDevPixels = downToDest.ProjectPoint(
upToAncestor.TransformPoint(Point(aPoint.x * devPixelsPerAppUnitFromFrame,
aPoint.y * devPixelsPerAppUnitFromFrame)));
if (!toDevPixels.HasPositiveWCoord()) {
// Not strictly true, but we failed to get a valid point in this
// coordinate space.
return NONINVERTIBLE_TRANSFORM;
}
aPoint.x = NSToCoordRound(toDevPixels.x / devPixelsPerAppUnitToFrame);
aPoint.y = NSToCoordRound(toDevPixels.y / devPixelsPerAppUnitToFrame);
return TRANSFORM_SUCCEEDED;
}
nsLayoutUtils::TransformResult
nsLayoutUtils::TransformRect(nsIFrame* aFromFrame, nsIFrame* aToFrame,
nsRect& aRect)
{
nsIFrame* nearestCommonAncestor = FindNearestCommonAncestorFrame(aFromFrame, aToFrame);
if (!nearestCommonAncestor) {
return NO_COMMON_ANCESTOR;
}
Matrix4x4 downToDest = GetTransformToAncestor(aToFrame, nearestCommonAncestor);
if (downToDest.IsSingular()) {
return NONINVERTIBLE_TRANSFORM;
}
downToDest.Invert();
Matrix4x4 upToAncestor = GetTransformToAncestor(aFromFrame, nearestCommonAncestor);
float devPixelsPerAppUnitFromFrame =
1.0f / aFromFrame->PresContext()->AppUnitsPerDevPixel();
float devPixelsPerAppUnitToFrame =
1.0f / aToFrame->PresContext()->AppUnitsPerDevPixel();
gfx::Rect toDevPixels = downToDest.ProjectRectBounds(
upToAncestor.ProjectRectBounds(
gfx::Rect(aRect.x * devPixelsPerAppUnitFromFrame,
aRect.y * devPixelsPerAppUnitFromFrame,
aRect.width * devPixelsPerAppUnitFromFrame,
aRect.height * devPixelsPerAppUnitFromFrame),
Rect(-std::numeric_limits<Float>::max() * 0.5f,
-std::numeric_limits<Float>::max() * 0.5f,
std::numeric_limits<Float>::max(),
std::numeric_limits<Float>::max())),
Rect(-std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame * 0.5f,
-std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame * 0.5f,
std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame,
std::numeric_limits<Float>::max() * devPixelsPerAppUnitFromFrame));
aRect.x = NSToCoordRound(toDevPixels.x / devPixelsPerAppUnitToFrame);
aRect.y = NSToCoordRound(toDevPixels.y / devPixelsPerAppUnitToFrame);
aRect.width = NSToCoordRound(toDevPixels.width / devPixelsPerAppUnitToFrame);
aRect.height = NSToCoordRound(toDevPixels.height / devPixelsPerAppUnitToFrame);
return TRANSFORM_SUCCEEDED;
}
nsRect
nsLayoutUtils::GetRectRelativeToFrame(Element* aElement, nsIFrame* aFrame)
{
if (!aElement || !aFrame) {
return nsRect();
}
nsIFrame* frame = aElement->GetPrimaryFrame();
if (!frame) {
return nsRect();
}
nsRect rect = frame->GetRectRelativeToSelf();
nsLayoutUtils::TransformResult rv =
nsLayoutUtils::TransformRect(frame, aFrame, rect);
if (rv != nsLayoutUtils::TRANSFORM_SUCCEEDED) {
return nsRect();
}
return rect;
}
bool
nsLayoutUtils::ContainsPoint(const nsRect& aRect, const nsPoint& aPoint,
nscoord aInflateSize)
{
nsRect rect = aRect;
rect.Inflate(aInflateSize);
return rect.Contains(aPoint);
}
nsRect
nsLayoutUtils::ClampRectToScrollFrames(nsIFrame* aFrame, const nsRect& aRect)
{
nsIFrame* closestScrollFrame =
nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::Scroll);
nsRect resultRect = aRect;
while (closestScrollFrame) {
nsIScrollableFrame* sf = do_QueryFrame(closestScrollFrame);
nsRect scrollPortRect = sf->GetScrollPortRect();
nsLayoutUtils::TransformRect(closestScrollFrame, aFrame, scrollPortRect);
resultRect = resultRect.Intersect(scrollPortRect);
// Check whether aRect is visible in the scroll frame or not.
if (resultRect.IsEmpty()) {
break;
}
// Get next ancestor scroll frame.
closestScrollFrame = nsLayoutUtils::GetClosestFrameOfType(
closestScrollFrame->GetParent(), LayoutFrameType::Scroll);
}
return resultRect;
}
bool
nsLayoutUtils::GetLayerTransformForFrame(nsIFrame* aFrame,
Matrix4x4* aTransform)
{
// FIXME/bug 796690: we can sometimes compute a transform in these
// cases, it just increases complexity considerably. Punt for now.
if (aFrame->Extend3DContext() || aFrame->HasTransformGetter()) {
return false;
}
nsIFrame* root = nsLayoutUtils::GetDisplayRootFrame(aFrame);
if (root->HasAnyStateBits(NS_FRAME_UPDATE_LAYER_TREE)) {
// Content may have been invalidated, so we can't reliably compute
// the "layer transform" in general.
return false;
}
// If the caller doesn't care about the value, early-return to skip
// overhead below.
if (!aTransform) {
return true;
}
nsDisplayListBuilder builder(root,
nsDisplayListBuilderMode::TRANSFORM_COMPUTATION,
false/*don't build caret*/);
builder.BeginFrame();
nsDisplayList list;
nsDisplayTransform* item =
new (&builder) nsDisplayTransform(&builder, aFrame, &list, nsRect());
*aTransform = item->GetTransform();
item->Destroy(&builder);
builder.EndFrame();
return true;
}
static bool
TransformGfxPointFromAncestor(nsIFrame *aFrame,
const Point &aPoint,
nsIFrame *aAncestor,
Point* aOut)
{
Matrix4x4 ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
ctm.Invert();
Point4D point = ctm.ProjectPoint(aPoint);
if (!point.HasPositiveWCoord()) {
return false;
}
*aOut = point.As2DPoint();
return true;
}
static Rect
TransformGfxRectToAncestor(nsIFrame *aFrame,
const Rect &aRect,
const nsIFrame *aAncestor,
bool* aPreservesAxisAlignedRectangles = nullptr,
Maybe<Matrix4x4>* aMatrixCache = nullptr,
bool aStopAtStackingContextAndDisplayPort = false,
nsIFrame** aOutAncestor = nullptr)
{
Matrix4x4 ctm;
if (aMatrixCache && *aMatrixCache) {
// We are given a matrix to use, so use it
ctm = aMatrixCache->value();
} else {
// Else, compute it
uint32_t flags = 0;
if (aStopAtStackingContextAndDisplayPort) {
flags |= nsIFrame::STOP_AT_STACKING_CONTEXT_AND_DISPLAY_PORT;
}
ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor, flags, aOutAncestor);
if (aMatrixCache) {
// and put it in the cache, if provided
*aMatrixCache = Some(ctm);
}
}
// Fill out the axis-alignment flag
if (aPreservesAxisAlignedRectangles) {
Matrix matrix2d;
*aPreservesAxisAlignedRectangles =
ctm.Is2D(&matrix2d) && matrix2d.PreservesAxisAlignedRectangles();
}
const nsIFrame* ancestor = aOutAncestor ? *aOutAncestor : aAncestor;
float factor = ancestor->PresContext()->AppUnitsPerDevPixel();
Rect maxBounds = Rect(float(nscoord_MIN) / factor * 0.5,
float(nscoord_MIN) / factor * 0.5,
float(nscoord_MAX) / factor,
float(nscoord_MAX) / factor);
return ctm.TransformAndClipBounds(aRect, maxBounds);
}
static SVGTextFrame*
GetContainingSVGTextFrame(nsIFrame* aFrame)
{
if (!nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
return nullptr;
}
return static_cast<SVGTextFrame*>(nsLayoutUtils::GetClosestFrameOfType(
aFrame->GetParent(), LayoutFrameType::SVGText));
}
nsPoint
nsLayoutUtils::TransformAncestorPointToFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
nsIFrame* aAncestor)
{
SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
Point result(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor));
if (text) {
if (!TransformGfxPointFromAncestor(text, result, aAncestor, &result)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
result = text->TransformFramePointToTextChild(result, aFrame);
} else {
if (!TransformGfxPointFromAncestor(aFrame, result, nullptr, &result)) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
}
return nsPoint(NSFloatPixelsToAppUnits(float(result.x), factor),
NSFloatPixelsToAppUnits(float(result.y), factor));
}
nsRect
nsLayoutUtils::TransformFrameRectToAncestor(nsIFrame* aFrame,
const nsRect& aRect,
const nsIFrame* aAncestor,
bool* aPreservesAxisAlignedRectangles /* = nullptr */,
Maybe<Matrix4x4>* aMatrixCache /* = nullptr */,
bool aStopAtStackingContextAndDisplayPort /* = false */,
nsIFrame** aOutAncestor /* = nullptr */)
{
SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
float srcAppUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
Rect result;
if (text) {
result = ToRect(text->TransformFrameRectFromTextChild(aRect, aFrame));
result = TransformGfxRectToAncestor(text, result, aAncestor,
nullptr, aMatrixCache,
aStopAtStackingContextAndDisplayPort, aOutAncestor);
// TransformFrameRectFromTextChild could involve any kind of transform, we
// could drill down into it to get an answer out of it but we don't yet.
if (aPreservesAxisAlignedRectangles)
*aPreservesAxisAlignedRectangles = false;
} else {
result = Rect(NSAppUnitsToFloatPixels(aRect.x, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.y, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.width, srcAppUnitsPerDevPixel),
NSAppUnitsToFloatPixels(aRect.height, srcAppUnitsPerDevPixel));
result = TransformGfxRectToAncestor(aFrame, result, aAncestor,
aPreservesAxisAlignedRectangles, aMatrixCache,
aStopAtStackingContextAndDisplayPort, aOutAncestor);
}
float destAppUnitsPerDevPixel = aAncestor->PresContext()->AppUnitsPerDevPixel();
return nsRect(NSFloatPixelsToAppUnits(float(result.x), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.y), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.width), destAppUnitsPerDevPixel),
NSFloatPixelsToAppUnits(float(result.height), destAppUnitsPerDevPixel));
}
static LayoutDeviceIntPoint GetWidgetOffset(nsIWidget* aWidget, nsIWidget*& aRootWidget) {
LayoutDeviceIntPoint offset(0, 0);
while ((aWidget->WindowType() == eWindowType_child ||
aWidget->IsPlugin())) {
nsIWidget* parent = aWidget->GetParent();
if (!parent) {
break;
}
LayoutDeviceIntRect bounds = aWidget->GetBounds();
offset += bounds.TopLeft();
aWidget = parent;
}
aRootWidget = aWidget;
return offset;
}
LayoutDeviceIntPoint
nsLayoutUtils::WidgetToWidgetOffset(nsIWidget* aFrom, nsIWidget* aTo) {
nsIWidget* fromRoot;
LayoutDeviceIntPoint fromOffset = GetWidgetOffset(aFrom, fromRoot);
nsIWidget* toRoot;
LayoutDeviceIntPoint toOffset = GetWidgetOffset(aTo, toRoot);
if (fromRoot == toRoot) {
return fromOffset - toOffset;
}
return aFrom->WidgetToScreenOffset() - aTo->WidgetToScreenOffset();
}
nsPoint
nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget, const LayoutDeviceIntPoint& aPt,
nsView* aView)
{
nsPoint viewOffset;
nsIWidget* viewWidget = aView->GetNearestWidget(&viewOffset);
if (!viewWidget) {
return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
LayoutDeviceIntPoint widgetPoint = aPt + WidgetToWidgetOffset(aWidget, viewWidget);
nsPoint widgetAppUnits(aPresContext->DevPixelsToAppUnits(widgetPoint.x),
aPresContext->DevPixelsToAppUnits(widgetPoint.y));
return widgetAppUnits - viewOffset;
}
LayoutDeviceIntPoint
nsLayoutUtils::TranslateViewToWidget(nsPresContext* aPresContext,
nsView* aView, nsPoint aPt,
nsIWidget* aWidget)
{
nsPoint viewOffset;
nsIWidget* viewWidget = aView->GetNearestWidget(&viewOffset);
if (!viewWidget) {
return LayoutDeviceIntPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
}
nsPoint pt = (aPt +
viewOffset).ApplyResolution(GetCurrentAPZResolutionScale(aPresContext->PresShell()));
LayoutDeviceIntPoint relativeToViewWidget(aPresContext->AppUnitsToDevPixels(pt.x),
aPresContext->AppUnitsToDevPixels(pt.y));
return relativeToViewWidget + WidgetToWidgetOffset(viewWidget, aWidget);
}
// Combine aNewBreakType with aOrigBreakType, but limit the break types
// to StyleClear::Left, Right, Both.
StyleClear
nsLayoutUtils::CombineBreakType(StyleClear aOrigBreakType,
StyleClear aNewBreakType)
{
StyleClear breakType = aOrigBreakType;
switch(breakType) {
case StyleClear::Left:
if (StyleClear::Right == aNewBreakType ||
StyleClear::Both == aNewBreakType) {
breakType = StyleClear::Both;
}
break;
case StyleClear::Right:
if (StyleClear::Left == aNewBreakType ||
StyleClear::Both == aNewBreakType) {
breakType = StyleClear::Both;
}
break;
case StyleClear::None:
if (StyleClear::Left == aNewBreakType ||
StyleClear::Right == aNewBreakType ||
StyleClear::Both == aNewBreakType) {
breakType = aNewBreakType;
}
break;
default:
break;
}
return breakType;
}
#ifdef MOZ_DUMP_PAINTING
#include <stdio.h>
static bool gDumpEventList = false;
// nsLayoutUtils::PaintFrame() can call itself recursively, so rather than
// maintaining a single paint count, we need a stack.
StaticAutoPtr<nsTArray<int>> gPaintCountStack;
struct AutoNestedPaintCount {
AutoNestedPaintCount() {
gPaintCountStack->AppendElement(0);
}
~AutoNestedPaintCount() {
gPaintCountStack->RemoveElementAt(gPaintCountStack->Length() - 1);
}
};
#endif
nsIFrame*
nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt, uint32_t aFlags)
{
AUTO_PROFILER_LABEL("nsLayoutUtils::GetFrameForPoint", GRAPHICS);
nsresult rv;
AutoTArray<nsIFrame*,8> outFrames;
rv = GetFramesForArea(aFrame, nsRect(aPt, nsSize(1, 1)), outFrames, aFlags);
NS_ENSURE_SUCCESS(rv, nullptr);
return outFrames.Length() ? outFrames.ElementAt(0) : nullptr;
}
nsresult
nsLayoutUtils::GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
nsTArray<nsIFrame*> &aOutFrames,
uint32_t aFlags)
{
AUTO_PROFILER_LABEL("nsLayoutUtils::GetFramesForArea", GRAPHICS);
nsDisplayListBuilder builder(aFrame,
nsDisplayListBuilderMode::EVENT_DELIVERY,
false);
builder.BeginFrame();
nsDisplayList list;
if (aFlags & IGNORE_PAINT_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
if (aFlags & IGNORE_ROOT_SCROLL_FRAME) {
nsIFrame* rootScrollFrame = aFrame->PresShell()->GetRootScrollFrame();
if (rootScrollFrame) {
builder.SetIgnoreScrollFrame(rootScrollFrame);
}
}
if (aFlags & IGNORE_CROSS_DOC) {
builder.SetDescendIntoSubdocuments(false);
}
builder.SetHitTestIsForVisibility(aFlags & ONLY_VISIBLE);
builder.EnterPresShell(aFrame);
builder.SetVisibleRect(aRect);
builder.SetDirtyRect(aRect);
aFrame->BuildDisplayListForStackingContext(&builder, &list);
builder.LeavePresShell(aFrame, nullptr);
#ifdef MOZ_DUMP_PAINTING
if (gDumpEventList) {
fprintf_stderr(stderr, "Event handling --- (%d,%d):\n", aRect.x, aRect.y);
std::stringstream ss;
nsFrame::PrintDisplayList(&builder, list, ss);
print_stderr(ss);
}
#endif
nsDisplayItem::HitTestState hitTestState;
list.HitTest(&builder, aRect, &hitTestState, &aOutFrames);
list.DeleteAll(&builder);
builder.EndFrame();
return NS_OK;
}
// aScrollFrameAsScrollable must be non-nullptr and queryable to an nsIFrame
FrameMetrics
nsLayoutUtils::CalculateBasicFrameMetrics(nsIScrollableFrame* aScrollFrame) {
nsIFrame* frame = do_QueryFrame(aScrollFrame);
MOZ_ASSERT(frame);
// Calculate the metrics necessary for calculating the displayport.
// This code has a lot in common with the code in ComputeFrameMetrics();
// we may want to refactor this at some point.
FrameMetrics metrics;
nsPresContext* presContext = frame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
CSSToLayoutDeviceScale deviceScale = presContext->CSSToDevPixelScale();
float resolution = 1.0f;
if (frame == presShell->GetRootScrollFrame()) {
// Only the root scrollable frame for a given presShell should pick up
// the presShell's resolution. All the other frames are 1.0.
resolution = presShell->GetResolution();
}
// Note: unlike in ComputeFrameMetrics(), we don't know the full cumulative
// resolution including FrameMetrics::mExtraResolution, because layout hasn't
// chosen a resolution to paint at yet. However, the display port calculation
// divides out mExtraResolution anyways, so we get the correct result by
// setting the mCumulativeResolution to everything except the extra resolution
// and leaving mExtraResolution at 1.
LayoutDeviceToLayerScale2D cumulativeResolution(
presShell->GetCumulativeResolution()
* nsLayoutUtils::GetTransformToAncestorScale(frame));
LayerToParentLayerScale layerToParentLayerScale(1.0f);
metrics.SetDevPixelsPerCSSPixel(deviceScale);
metrics.SetPresShellResolution(resolution);
metrics.SetCumulativeResolution(cumulativeResolution);
metrics.SetZoom(deviceScale * cumulativeResolution * layerToParentLayerScale);
// Only the size of the composition bounds is relevant to the
// displayport calculation, not its origin.
nsSize compositionSize = nsLayoutUtils::CalculateCompositionSizeForFrame(frame);
LayoutDeviceToParentLayerScale2D compBoundsScale;
if (frame == presShell->GetRootScrollFrame() && presContext->IsRootContentDocument()) {
if (presContext->GetParentPresContext()) {
float res = presContext->GetParentPresContext()->PresShell()->GetCumulativeResolution();
compBoundsScale = LayoutDeviceToParentLayerScale2D(
LayoutDeviceToParentLayerScale(res));
}
} else {
compBoundsScale = cumulativeResolution * layerToParentLayerScale;
}
metrics.SetCompositionBounds(
LayoutDeviceRect::FromAppUnits(nsRect(nsPoint(0, 0), compositionSize),
presContext->AppUnitsPerDevPixel())
* compBoundsScale);
metrics.SetRootCompositionSize(
nsLayoutUtils::CalculateRootCompositionSize(frame, false, metrics));
metrics.SetScrollOffset(CSSPoint::FromAppUnits(
aScrollFrame->GetScrollPosition()));
metrics.SetScrollableRect(CSSRect::FromAppUnits(
nsLayoutUtils::CalculateScrollableRectForFrame(aScrollFrame, nullptr)));
return metrics;
}
bool
nsLayoutUtils::CalculateAndSetDisplayPortMargins(nsIScrollableFrame* aScrollFrame,
RepaintMode aRepaintMode) {
nsIFrame* frame = do_QueryFrame(aScrollFrame);
MOZ_ASSERT(frame);
nsIContent* content = frame->GetContent();
MOZ_ASSERT(content);
FrameMetrics metrics = CalculateBasicFrameMetrics(aScrollFrame);
ScreenMargin displayportMargins = APZCTreeManager::CalculatePendingDisplayPort(
metrics, ParentLayerPoint(0.0f, 0.0f));
nsIPresShell* presShell = frame->PresContext()->GetPresShell();
return nsLayoutUtils::SetDisplayPortMargins(
content, presShell, displayportMargins, 0, aRepaintMode);
}
bool
nsLayoutUtils::MaybeCreateDisplayPort(nsDisplayListBuilder& aBuilder,
nsIFrame* aScrollFrame,
RepaintMode aRepaintMode)
{
nsIContent* content = aScrollFrame->GetContent();
nsIScrollableFrame* scrollableFrame = do_QueryFrame(aScrollFrame);
if (!content || !scrollableFrame) {
return false;
}
bool haveDisplayPort = HasDisplayPort(content);
// We perform an optimization where we ensure that at least one
// async-scrollable frame (i.e. one that WantsAsyncScroll()) has a displayport.
// If that's not the case yet, and we are async-scrollable, we will get a
// displayport.
if (aBuilder.IsPaintingToWindow() &&
nsLayoutUtils::AsyncPanZoomEnabled(aScrollFrame) &&
!aBuilder.HaveScrollableDisplayPort() &&
scrollableFrame->WantAsyncScroll()) {
// If we don't already have a displayport, calculate and set one.
if (!haveDisplayPort) {
CalculateAndSetDisplayPortMargins(scrollableFrame, aRepaintMode);
#ifdef DEBUG
haveDisplayPort = HasDisplayPort(content);
MOZ_ASSERT(haveDisplayPort, "should have a displayport after having just set it");
#endif
}
// Record that the we now have a scrollable display port.
aBuilder.SetHaveScrollableDisplayPort();
return true;
}
return false;
}
nsIScrollableFrame*
nsLayoutUtils::GetAsyncScrollableAncestorFrame(nsIFrame* aTarget)
{
uint32_t flags = nsLayoutUtils::SCROLLABLE_ALWAYS_MATCH_ROOT
| nsLayoutUtils::SCROLLABLE_ONLY_ASYNC_SCROLLABLE
| nsLayoutUtils::SCROLLABLE_FIXEDPOS_FINDS_ROOT;
return nsLayoutUtils::GetNearestScrollableFrame(aTarget, flags);
}
void
nsLayoutUtils::SetZeroMarginDisplayPortOnAsyncScrollableAncestors(nsIFrame* aFrame,
RepaintMode aRepaintMode)
{
nsIFrame* frame = aFrame;
while (frame) {
frame = nsLayoutUtils::GetCrossDocParentFrame(frame);
if (!frame) {
break;
}
nsIScrollableFrame* scrollAncestor = GetAsyncScrollableAncestorFrame(frame);
if (!scrollAncestor) {
break;
}
frame = do_QueryFrame(scrollAncestor);
MOZ_ASSERT(frame);
MOZ_ASSERT(scrollAncestor->WantAsyncScroll() ||
frame->PresShell()->GetRootScrollFrame() == frame);
if (nsLayoutUtils::AsyncPanZoomEnabled(frame) &&
!nsLayoutUtils::HasDisplayPort(frame->GetContent())) {
nsLayoutUtils::SetDisplayPortMargins(
frame->GetContent(), frame->PresShell(), ScreenMargin(), 0,
aRepaintMode);
}
}
}
bool
nsLayoutUtils::MaybeCreateDisplayPortInFirstScrollFrameEncountered(
nsIFrame* aFrame, nsDisplayListBuilder& aBuilder)
{
nsIScrollableFrame* sf = do_QueryFrame(aFrame);
if (sf) {
if (MaybeCreateDisplayPort(aBuilder, aFrame, RepaintMode::Repaint)) {
return true;
}
}
if (aFrame->IsPlaceholderFrame()) {
nsPlaceholderFrame* placeholder = static_cast<nsPlaceholderFrame*>(aFrame);
if (MaybeCreateDisplayPortInFirstScrollFrameEncountered(
placeholder->GetOutOfFlowFrame(), aBuilder)) {
return true;
}
}
if (aFrame->IsSubDocumentFrame()) {
nsIPresShell* presShell =
static_cast<nsSubDocumentFrame*>(aFrame)->GetSubdocumentPresShellForPainting(0);
nsIFrame* root = presShell ? presShell->GetRootFrame() : nullptr;
if (root) {
if (MaybeCreateDisplayPortInFirstScrollFrameEncountered(root, aBuilder)) {
return true;
}
}
}
if (aFrame->IsDeckFrame()) {
// only descend the visible card of a decks
nsIFrame* child = static_cast<nsDeckFrame*>(aFrame)->GetSelectedBox();
if (child) {
return MaybeCreateDisplayPortInFirstScrollFrameEncountered(child, aBuilder);
}
}
for (nsIFrame* child : aFrame->PrincipalChildList()) {
if (MaybeCreateDisplayPortInFirstScrollFrameEncountered(child, aBuilder)) {
return true;
}
}
return false;
}
void
nsLayoutUtils::ExpireDisplayPortOnAsyncScrollableAncestor(nsIFrame* aFrame)
{
nsIFrame* frame = aFrame;
while (frame) {
frame = nsLayoutUtils::GetCrossDocParentFrame(frame);
if (!frame) {
break;
}
nsIScrollableFrame* scrollAncestor = GetAsyncScrollableAncestorFrame(frame);
if (!scrollAncestor) {
break;
}
frame = do_QueryFrame(scrollAncestor);
MOZ_ASSERT(frame);
if (!frame) {
break;
}
MOZ_ASSERT(scrollAncestor->WantAsyncScroll() ||
frame->PresShell()->GetRootScrollFrame() == frame);
if (nsLayoutUtils::HasDisplayPort(frame->GetContent())) {
scrollAncestor->TriggerDisplayPortExpiration();
// Stop after the first trigger. If it failed, there's no point in
// continuing because all the rest of the frames we encounter are going
// to be ancestors of |scrollAncestor| which will keep its displayport.
// If the trigger succeeded, we stop because when the trigger executes
// it will call this function again to trigger the next ancestor up the
// chain.
break;
}
}
}
void
nsLayoutUtils::AddExtraBackgroundItems(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aCanvasArea,
const nsRegion& aVisibleRegion,
nscolor aBackstop)
{
LayoutFrameType frameType = aFrame->Type();
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
// For the viewport frame in print preview/page layout we want to paint
// the grey background behind the page, not the canvas color.
if (frameType == LayoutFrameType::Viewport &&
nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
nsRect bounds = nsRect(aBuilder.ToReferenceFrame(aFrame),
aFrame->GetSize());
nsDisplayListBuilder::AutoBuildingDisplayList
buildingDisplayList(&aBuilder, aFrame, bounds, bounds, false);
presShell->AddPrintPreviewBackgroundItem(aBuilder, aList, aFrame, bounds);
} else if (frameType != LayoutFrameType::Page) {
// For printing, this function is first called on an nsPageFrame, which
// creates a display list with a PageContent item. The PageContent item's
// paint function calls this function on the nsPageFrame's child which is
// an nsPageContentFrame. We only want to add the canvas background color
// item once, for the nsPageContentFrame.
// Add the canvas background color to the bottom of the list. This
// happens after we've built the list so that AddCanvasBackgroundColorItem
// can monkey with the contents if necessary.
nsRect canvasArea = aVisibleRegion.GetBounds();
canvasArea.IntersectRect(aCanvasArea, canvasArea);
nsDisplayListBuilder::AutoBuildingDisplayList
buildingDisplayList(&aBuilder, aFrame, canvasArea, canvasArea, false);
presShell->AddCanvasBackgroundColorItem(
aBuilder, aList, aFrame, canvasArea, aBackstop);
}
}
/**
* Returns a retained display list builder for frame |aFrame|. If there is no
* retained display list builder property set for the frame, and if the flag
* |aRetainingEnabled| is true, a new retained display list builder is created,
* stored as a property for the frame, and returned.
*/
static RetainedDisplayListBuilder*
GetOrCreateRetainedDisplayListBuilder(nsIFrame* aFrame, bool aRetainingEnabled,
bool aBuildCaret)
{
RetainedDisplayListBuilder* retainedBuilder =
aFrame->GetProperty(RetainedDisplayListBuilder::Cached());
if (retainedBuilder) {
return retainedBuilder;
}
if (aRetainingEnabled) {
retainedBuilder =
new RetainedDisplayListBuilder(aFrame, nsDisplayListBuilderMode::PAINTING,
aBuildCaret);
aFrame->SetProperty(RetainedDisplayListBuilder::Cached(), retainedBuilder);
}
return retainedBuilder;
}
nsresult
nsLayoutUtils::PaintFrame(gfxContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
nsDisplayListBuilderMode aBuilderMode,
PaintFrameFlags aFlags)
{
AUTO_PROFILER_LABEL("nsLayoutUtils::PaintFrame", GRAPHICS);
#ifdef MOZ_DUMP_PAINTING
if (!gPaintCountStack) {
gPaintCountStack = new nsTArray<int>();
ClearOnShutdown(&gPaintCountStack);
gPaintCountStack->AppendElement(0);
}
++gPaintCountStack->LastElement();
AutoNestedPaintCount nestedPaintCount;
#endif
if (aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) {
nsView* view = aFrame->GetView();
if (!(view && view->GetWidget() && GetDisplayRootFrame(aFrame) == aFrame)) {
aFlags &= ~PaintFrameFlags::PAINT_WIDGET_LAYERS;
NS_ASSERTION(aRenderingContext, "need a rendering context");
}
}
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
if (!rootPresContext) {
return NS_OK;
}
TimeStamp startBuildDisplayList = TimeStamp::Now();
const bool buildCaret = !(aFlags & PaintFrameFlags::PAINT_HIDE_CARET);
const bool isForPainting = (aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) &&
aBuilderMode == nsDisplayListBuilderMode::PAINTING;
// Only allow retaining for painting when preffed on, and for root frames (since
// the modified frame tracking is per-root-frame).
const bool retainingEnabled =
isForPainting && AreRetainedDisplayListsEnabled() && !aFrame->GetParent();
RetainedDisplayListBuilder* retainedBuilder =
GetOrCreateRetainedDisplayListBuilder(aFrame, retainingEnabled, buildCaret);
// Only use the retained display list builder if the retaining is currently
// enabled. This check is needed because it is possible that the pref has been
// disabled after creating the retained display list builder.
const bool useRetainedBuilder = retainedBuilder && retainingEnabled;
Maybe<nsDisplayListBuilder> nonRetainedBuilder;
Maybe<nsDisplayList> nonRetainedList;
nsDisplayListBuilder* builderPtr = nullptr;
nsDisplayList* listPtr = nullptr;
if (useRetainedBuilder) {
builderPtr = retainedBuilder->Builder();
listPtr = retainedBuilder->List();
} else {
nonRetainedBuilder.emplace(aFrame, aBuilderMode, buildCaret);
builderPtr = nonRetainedBuilder.ptr();
nonRetainedList.emplace();
listPtr = nonRetainedList.ptr();
}
// Retained builder exists, but display list retaining is disabled.
if (!useRetainedBuilder && retainedBuilder) {
// Clear the modified frames lists and frame properties.
retainedBuilder->ClearModifiedFrameProps();
// Clear the retained display list.
retainedBuilder->List()->DeleteAll(retainedBuilder->Builder());
}
nsDisplayListBuilder& builder = *builderPtr;
nsDisplayList& list = *listPtr;
builder.BeginFrame();
if (aFlags & PaintFrameFlags::PAINT_IN_TRANSFORM) {
builder.SetInTransform(true);
}
if (aFlags & PaintFrameFlags::PAINT_SYNC_DECODE_IMAGES) {
builder.SetSyncDecodeImages(true);
}
if (aFlags & (PaintFrameFlags::PAINT_WIDGET_LAYERS |
PaintFrameFlags::PAINT_TO_WINDOW)) {
builder.SetPaintingToWindow(true);
}
if (aFlags & PaintFrameFlags::PAINT_IGNORE_SUPPRESSION) {
builder.IgnorePaintSuppression();
}
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
if (rootScrollFrame && !aFrame->GetParent()) {
nsIScrollableFrame* rootScrollableFrame = presShell->GetRootScrollFrameAsScrollable();
MOZ_ASSERT(rootScrollableFrame);
nsRect displayPortBase = aFrame->GetVisualOverflowRectRelativeToSelf();
nsRect temp = displayPortBase;
Unused << rootScrollableFrame->DecideScrollableLayer(&builder, &displayPortBase, &temp,
/* aSetBase = */ true);
}
nsRegion visibleRegion;
if (aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) {
// This layer tree will be reused, so we'll need to calculate it
// for the whole "visible" area of the window
//
// |ignoreViewportScrolling| and |usingDisplayPort| are persistent
// document-rendering state. We rely on PresShell to flush
// retained layers as needed when that persistent state changes.
visibleRegion = aFrame->GetVisualOverflowRectRelativeToSelf();
} else {
visibleRegion = aDirtyRegion;
}
// If the root has embedded plugins, flag the builder so we know we'll need
// to update plugin geometry after painting.
if ((aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) &&
!(aFlags & PaintFrameFlags::PAINT_DOCUMENT_RELATIVE) &&
rootPresContext->NeedToComputePluginGeometryUpdates()) {
builder.SetWillComputePluginGeometry(true);
}
nsRect canvasArea(nsPoint(0, 0), aFrame->GetSize());
bool ignoreViewportScrolling =
aFrame->GetParent() ? false : presShell->IgnoringViewportScrolling();
if (ignoreViewportScrolling && rootScrollFrame) {
nsIScrollableFrame* rootScrollableFrame =
presShell->GetRootScrollFrameAsScrollable();
if (aFlags & PaintFrameFlags::PAINT_DOCUMENT_RELATIVE) {
// Make visibleRegion and aRenderingContext relative to the
// scrolled frame instead of the root frame.
nsPoint pos = rootScrollableFrame->GetScrollPosition();
visibleRegion.MoveBy(-pos);
if (aRenderingContext) {
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(pos,
presContext->AppUnitsPerDevPixel());
aRenderingContext->SetMatrixDouble(
aRenderingContext->CurrentMatrixDouble().PreTranslate(devPixelOffset));
}
}
builder.SetIgnoreScrollFrame(rootScrollFrame);
nsCanvasFrame* canvasFrame =
do_QueryFrame(rootScrollableFrame->GetScrolledFrame());
if (canvasFrame) {
// Use UnionRect here to ensure that areas where the scrollbars
// were are still filled with the background color.
canvasArea.UnionRect(canvasArea,
canvasFrame->CanvasArea() + builder.ToReferenceFrame(canvasFrame));
}
}
builder.ClearHaveScrollableDisplayPort();
if (builder.IsPaintingToWindow()) {
MaybeCreateDisplayPortInFirstScrollFrameEncountered(aFrame, builder);
}
nsRect visibleRect = visibleRegion.GetBounds();
{
AUTO_PROFILER_LABEL("nsLayoutUtils::PaintFrame:BuildDisplayList",
GRAPHICS);
AUTO_PROFILER_TRACING("Paint", "DisplayList");
PaintTelemetry::AutoRecord record(PaintTelemetry::Metric::DisplayList);
TimeStamp dlStart = TimeStamp::Now();
{
// If a scrollable container layer is created in nsDisplayList::PaintForFrame,
// it will be the scroll parent for display items that are built in the
// BuildDisplayListForStackingContext call below. We need to set the scroll
// parent on the display list builder while we build those items, so that they
// can pick up their scroll parent's id.
ViewID id = FrameMetrics::NULL_SCROLL_ID;
if (ignoreViewportScrolling && presContext->IsRootContentDocument()) {
if (nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame()) {
if (nsIContent* content = rootScrollFrame->GetContent()) {
id = nsLayoutUtils::FindOrCreateIDFor(content);
}
}
}
else if (presShell->GetDocument() && presShell->GetDocument()->IsRootDisplayDocument()
&& !presShell->GetRootScrollFrame()) {
// In cases where the root document is a XUL document, we want to take
// the ViewID from the root element, as that will be the ViewID of the
// root APZC in the tree. Skip doing this in cases where we know
// nsGfxScrollFrame::BuilDisplayList will do it instead.
if (dom::Element* element = presShell->GetDocument()->GetDocumentElement()) {
id = nsLayoutUtils::FindOrCreateIDFor(element);
}
}
nsDisplayListBuilder::AutoCurrentScrollParentIdSetter idSetter(&builder, id);
builder.SetVisibleRect(visibleRect);
builder.SetIsBuilding(true);
builder.SetAncestorHasApzAwareEventHandler(
builder.IsBuildingLayerEventRegions() &&
nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(presShell));
DisplayListChecker beforeMergeChecker;
DisplayListChecker afterMergeChecker;
// Attempt to do a partial build and merge into the existing list.
// This calls BuildDisplayListForStacking context on a subset of the
// viewport.
bool merged = false;
if (useRetainedBuilder) {
if (gfxPrefs::LayoutVerifyRetainDisplayList()) {
beforeMergeChecker.Set(&list, "BM");
}
merged = retainedBuilder->AttemptPartialUpdate(aBackstop);
if (merged && beforeMergeChecker) {
afterMergeChecker.Set(&list, "AM");
}
}
if (merged &&
(gfxPrefs::LayoutDisplayListBuildTwice() || afterMergeChecker)) {
merged = false;
if (gfxPrefs::LayersDrawFPS()) {
if (RefPtr<LayerManager> lm = builder.GetWidgetLayerManager()) {
if (PaintTiming* pt = ClientLayerManager::MaybeGetPaintTiming(lm)) {
pt->dl2Ms() = (TimeStamp::Now() - dlStart).ToMilliseconds();
}
}
}
dlStart = TimeStamp::Now();
}
if (!merged) {
list.DeleteAll(&builder);
builder.EnterPresShell(aFrame);
builder.SetDirtyRect(visibleRect);
builder.ClearWindowDraggingRegion();
aFrame->BuildDisplayListForStackingContext(&builder, &list);
AddExtraBackgroundItems(builder, list, aFrame, canvasArea, visibleRegion, aBackstop);
builder.LeavePresShell(aFrame, &list);
if (afterMergeChecker) {
DisplayListChecker nonRetainedChecker(&list, "NR");
std::stringstream ss;
ss << "**** Differences between retained-after-merged (AM) and "
<< "non-retained (NR) display lists:";
if (!nonRetainedChecker.CompareList(afterMergeChecker, ss)) {
ss << "\n\n*** non-retained display items:";
nonRetainedChecker.Dump(ss);
ss << "\n\n*** before-merge retained display items:";
beforeMergeChecker.Dump(ss);
ss << "\n\n*** after-merge retained display items:";
afterMergeChecker.Dump(ss);
fprintf(stderr, "%s\n\n", ss.str().c_str());
#ifdef DEBUG_FRAME_DUMP
fprintf(stderr, "*** Frame tree:\n");
aFrame->DumpFrameTree();
#endif
}
}
}
}
builder.SetIsBuilding(false);
builder.IncrementPresShellPaintCount(presShell);
if (gfxPrefs::LayersDrawFPS()) {
if (RefPtr<LayerManager> lm = builder.GetWidgetLayerManager()) {
if (PaintTiming* pt = ClientLayerManager::MaybeGetPaintTiming(lm)) {
pt->dlMs() = (TimeStamp::Now() - dlStart).ToMilliseconds();
}
}
}
}
builder.Check();
Telemetry::AccumulateTimeDelta(Telemetry::PAINT_BUILD_DISPLAYLIST_TIME,
startBuildDisplayList);
bool consoleNeedsDisplayList = gfxUtils::DumpDisplayList() || gfxEnv::DumpPaint();
#ifdef MOZ_DUMP_PAINTING
FILE* savedDumpFile = gfxUtils::sDumpPaintFile;
#endif
UniquePtr<std::stringstream> ss;
if (consoleNeedsDisplayList) {
ss = MakeUnique<std::stringstream>();
#ifdef MOZ_DUMP_PAINTING
if (gfxEnv::DumpPaintToFile()) {
nsCString string("dump-");
// Include the process ID in the dump file name, to make sure that in an
// e10s setup different processes don't clobber each other's dump files.
string.AppendInt(getpid());
for (int paintCount : *gPaintCountStack) {
string.AppendLiteral("-");
string.AppendInt(paintCount);
}
string.AppendLiteral(".html");
gfxUtils::sDumpPaintFile = fopen(string.BeginReading(), "w");
} else {
gfxUtils::sDumpPaintFile = stderr;
}
if (gfxEnv::DumpPaintToFile()) {
*ss << "<html><head><script>\n"
"var array = {};\n"
"function ViewImage(index) { \n"
" var image = document.getElementById(index);\n"
" if (image.src) {\n"
" image.removeAttribute('src');\n"
" } else {\n"
" image.src = array[index];\n"
" }\n"
"}</script></head><body>";
}
#endif
*ss << nsPrintfCString("Painting --- before optimization (dirty %d,%d,%d,%d):\n",
visibleRect.x, visibleRect.y, visibleRect.width, visibleRect.height).get();
nsFrame::PrintDisplayList(&builder, list, *ss, gfxEnv::DumpPaintToFile());
if (gfxEnv::DumpPaint() || gfxEnv::DumpPaintItems()) {
// Flush stream now to avoid reordering dump output relative to
// messages dumped by PaintRoot below.
fprint_stderr(gfxUtils::sDumpPaintFile, *ss);
ss = MakeUnique<std::stringstream>();
}
}
uint32_t flags = nsDisplayList::PAINT_DEFAULT;
if (aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) {
flags |= nsDisplayList::PAINT_USE_WIDGET_LAYERS;
if (!(aFlags & PaintFrameFlags::PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
// If we're finished building display list items for painting of the outermost
// pres shell, notify the widget about any toolbars we've encountered.
widget->UpdateThemeGeometries(builder.GetThemeGeometries());
}
}
}
if (aFlags & PaintFrameFlags::PAINT_EXISTING_TRANSACTION) {
flags |= nsDisplayList::PAINT_EXISTING_TRANSACTION;
}
if (aFlags & PaintFrameFlags::PAINT_NO_COMPOSITE) {
flags |= nsDisplayList::PAINT_NO_COMPOSITE;
}
if (aFlags & PaintFrameFlags::PAINT_COMPRESSED) {
flags |= nsDisplayList::PAINT_COMPRESSED;
}
TimeStamp paintStart = TimeStamp::Now();
RefPtr<LayerManager> layerManager
= list.PaintRoot(&builder, aRenderingContext, flags);
Telemetry::AccumulateTimeDelta(Telemetry::PAINT_RASTERIZE_TIME,
paintStart);
builder.Check();
if (gfxPrefs::GfxLoggingPaintedPixelCountEnabled()) {
TimeStamp now = TimeStamp::Now();
float rasterizeTime = (now - paintStart).ToMilliseconds();
uint32_t pixelCount = layerManager->GetAndClearPaintedPixelCount();
static std::vector<std::pair<TimeStamp, uint32_t>> history;
if (pixelCount) {
history.push_back(std::make_pair(now, pixelCount));
}
uint32_t paintedInLastSecond = 0;
for (auto i = history.begin(); i != history.end(); i++) {
if ((now - i->first).ToMilliseconds() > 1000.0f) {
// more than 1000ms ago, don't count it
continue;
}
if (paintedInLastSecond == 0) {
// This is the first one in the last 1000ms, so drop everything earlier
history.erase(history.begin(), i);
i = history.begin();
}
paintedInLastSecond += i->second;
MOZ_ASSERT(paintedInLastSecond); // all historical pixel counts are > 0
}
printf_stderr("Painted %u pixels in %fms (%u in the last 1000ms)\n",
pixelCount, rasterizeTime, paintedInLastSecond);
}
if (consoleNeedsDisplayList) {
*ss << "Painting --- after optimization:\n";
nsFrame::PrintDisplayList(&builder, list, *ss, gfxEnv::DumpPaintToFile());
*ss << "Painting --- layer tree:\n";
if (layerManager) {
FrameLayerBuilder::DumpRetainedLayerTree(layerManager, *ss,
gfxEnv::DumpPaintToFile());
}
fprint_stderr(gfxUtils::sDumpPaintFile, *ss);
#ifdef MOZ_DUMP_PAINTING
if (gfxEnv::DumpPaintToFile()) {
*ss << "</body></html>";
}
if (gfxEnv::DumpPaintToFile()) {
fclose(gfxUtils::sDumpPaintFile);
}
gfxUtils::sDumpPaintFile = savedDumpFile;
#endif
std::stringstream lsStream;
nsFrame::PrintDisplayList(&builder, list, lsStream);
if (layerManager->GetRoot()) {
layerManager->GetRoot()->SetDisplayListLog(lsStream.str().c_str());
}
}
#ifdef MOZ_DUMP_PAINTING
if (gfxPrefs::DumpClientLayers()) {
std::stringstream ss;
FrameLayerBuilder::DumpRetainedLayerTree(layerManager, ss, false);
print_stderr(ss);
}
#endif
// Update the widget's opaque region information. This sets
// glass boundaries on Windows. Also set up the window dragging region
// and plugin clip regions and bounds.
if ((aFlags & PaintFrameFlags::PAINT_WIDGET_LAYERS) &&
!(aFlags & PaintFrameFlags::PAINT_DOCUMENT_RELATIVE)) {
nsIWidget *widget = aFrame->GetNearestWidget();
if (widget) {
nsRegion opaqueRegion;
opaqueRegion.And(builder.GetWindowExcludeGlassRegion(), builder.GetWindowOpaqueRegion());
widget->UpdateOpaqueRegion(
LayoutDeviceIntRegion::FromUnknownRegion(
opaqueRegion.ToNearestPixels(presContext->AppUnitsPerDevPixel())));
widget->UpdateWindowDraggingRegion(builder.GetWindowDraggingRegion());
}
}
if (builder.WillComputePluginGeometry()) {
// For single process compute and apply plugin geometry updates to plugin
// windows, then request composition. For content processes skip eveything
// except requesting composition. Geometry updates were calculated and
// shipped to the chrome process in nsDisplayList when the layer
// transaction completed.
if (XRE_IsParentProcess()) {
rootPresContext->ComputePluginGeometryUpdates(aFrame, &builder, &list);
// We're not going to get a WillPaintWindow event here if we didn't do
// widget invalidation, so just apply the plugin geometry update here
// instead. We could instead have the compositor send back an equivalent
// to WillPaintWindow, but it should be close enough to now not to matter.
if (layerManager && !layerManager->NeedsWidgetInvalidation()) {
rootPresContext->ApplyPluginGeometryUpdates();
}
}
// We told the compositor thread not to composite when it received the
// transaction because we wanted to update plugins first. Schedule the
// composite now.
if (layerManager) {
layerManager->ScheduleComposite();
}
}
builder.Check();
{
AUTO_PROFILER_TRACING("Paint", "DisplayListResources");
// Flush the list so we don't trigger the IsEmpty-on-destruction assertion
if (!useRetainedBuilder) {
list.DeleteAll(&builder);
}
builder.EndFrame();
}
return NS_OK;
}
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been measured
* so it doesn't have to keep measuring the same text over and over
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns the (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor falls
*/
bool
nsLayoutUtils::BinarySearchForPosition(DrawTarget* aDrawTarget,
nsFontMetrics& aFontMetrics,
const char16_t* aText,
int32_t aBaseWidth,
int32_t aBaseInx,
int32_t aStartInx,
int32_t aEndInx,
int32_t aCursorPos,
int32_t& aIndex,
int32_t& aTextWidth)
{
int32_t range = aEndInx - aStartInx;
if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) {
aIndex = aStartInx + aBaseInx;
aTextWidth = nsLayoutUtils::AppUnitWidthOfString(aText, aIndex,
aFontMetrics, aDrawTarget);
return true;
}
int32_t inx = aStartInx + (range / 2);
// Make sure we don't leave a dangling low surrogate
if (NS_IS_HIGH_SURROGATE(aText[inx-1]))
inx++;
int32_t textWidth = nsLayoutUtils::AppUnitWidthOfString(aText, inx,
aFontMetrics,
aDrawTarget);
int32_t fullWidth = aBaseWidth + textWidth;
if (fullWidth == aCursorPos) {
aTextWidth = textWidth;
aIndex = inx;
return true;
} else if (aCursorPos < fullWidth) {
aTextWidth = aBaseWidth;
if (BinarySearchForPosition(aDrawTarget, aFontMetrics, aText, aBaseWidth,
aBaseInx, aStartInx, inx, aCursorPos, aIndex,
aTextWidth)) {
return true;
}
} else {
aTextWidth = fullWidth;
if (BinarySearchForPosition(aDrawTarget, aFontMetrics, aText, aBaseWidth,
aBaseInx, inx, aEndInx, aCursorPos, aIndex,
aTextWidth)) {
return true;
}
}
return false;
}
void
nsLayoutUtils::AddBoxesForFrame(nsIFrame* aFrame,
nsLayoutUtils::BoxCallback* aCallback)
{
nsAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableWrapper) {
AddBoxesForFrame(aFrame->PrincipalChildList().FirstChild(), aCallback);
if (aCallback->mIncludeCaptionBoxForTable) {
nsIFrame* kid = aFrame->GetChildList(nsIFrame::kCaptionList).FirstChild();
if (kid) {
AddBoxesForFrame(kid, aCallback);
}
}
} else if (pseudoType == nsCSSAnonBoxes::mozBlockInsideInlineWrapper ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid : aFrame->PrincipalChildList()) {
AddBoxesForFrame(kid, aCallback);
}
} else {
aCallback->AddBox(aFrame);
}
}
void
nsLayoutUtils::GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback)
{
while (aFrame) {
AddBoxesForFrame(aFrame, aCallback);
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
}
}
nsIFrame*
nsLayoutUtils::GetFirstNonAnonymousFrame(nsIFrame* aFrame)
{
while (aFrame) {
nsAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
if (pseudoType == nsCSSAnonBoxes::tableWrapper) {
nsIFrame* f = GetFirstNonAnonymousFrame(aFrame->PrincipalChildList().FirstChild());
if (f) {
return f;
}
nsIFrame* kid = aFrame->GetChildList(nsIFrame::kCaptionList).FirstChild();
if (kid) {
f = GetFirstNonAnonymousFrame(kid);
if (f) {
return f;
}
}
} else if (pseudoType == nsCSSAnonBoxes::mozBlockInsideInlineWrapper ||
pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
for (nsIFrame* kid : aFrame->PrincipalChildList()) {
nsIFrame* f = GetFirstNonAnonymousFrame(kid);
if (f) {
return f;
}
}
} else {
return aFrame;
}
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
}
return nullptr;
}
struct BoxToRect : public nsLayoutUtils::BoxCallback {
nsIFrame* mRelativeTo;
nsLayoutUtils::RectCallback* mCallback;
uint32_t mFlags;
BoxToRect(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback,
uint32_t aFlags)
: mRelativeTo(aRelativeTo), mCallback(aCallback), mFlags(aFlags) {}
virtual void AddBox(nsIFrame* aFrame) override {
nsRect r;
nsIFrame* outer = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(aFrame, &r);
if (!outer) {
outer = aFrame;
switch (mFlags & nsLayoutUtils::RECTS_WHICH_BOX_MASK) {
case nsLayoutUtils::RECTS_USE_CONTENT_BOX:
r = aFrame->GetContentRectRelativeToSelf();
break;
case nsLayoutUtils::RECTS_USE_PADDING_BOX:
r = aFrame->GetPaddingRectRelativeToSelf();
break;
case nsLayoutUtils::RECTS_USE_MARGIN_BOX:
r = aFrame->GetMarginRectRelativeToSelf();
break;
default: // Use the border box
r = aFrame->GetRectRelativeToSelf();
}
}
if (mFlags & nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS) {
r = nsLayoutUtils::TransformFrameRectToAncestor(outer, r, mRelativeTo);
} else {
r += outer->GetOffsetTo(mRelativeTo);
}
mCallback->AddRect(r);
}
};
struct MOZ_RAII BoxToRectAndText : public BoxToRect {
Sequence<nsString>* mTextList;
BoxToRectAndText(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback,
Sequence<nsString>* aTextList, uint32_t aFlags)
: BoxToRect(aRelativeTo, aCallback, aFlags), mTextList(aTextList) {}
static void AccumulateText(nsIFrame* aFrame, nsAString& aResult) {
MOZ_ASSERT(aFrame);
// Get all the text in aFrame and child frames, while respecting
// the content offsets in each of the nsTextFrames.
if (aFrame->IsTextFrame()) {
nsTextFrame* textFrame = static_cast<nsTextFrame*>(aFrame);
nsIFrame::RenderedText renderedText = textFrame->GetRenderedText(
textFrame->GetContentOffset(),
textFrame->GetContentOffset() + textFrame->GetContentLength(),
nsIFrame::TextOffsetType::OFFSETS_IN_CONTENT_TEXT,
nsIFrame::TrailingWhitespace::DONT_TRIM_TRAILING_WHITESPACE);
aResult.Append(renderedText.mString);
}
for (nsIFrame* child = aFrame->PrincipalChildList().FirstChild();
child;
child = child->GetNextSibling()) {
AccumulateText(child, aResult);
}
}
virtual void AddBox(nsIFrame* aFrame) override {
BoxToRect::AddBox(aFrame);
if (mTextList) {
nsString* textForFrame = mTextList->AppendElement(fallible);
if (textForFrame) {
AccumulateText(aFrame, *textForFrame);
}
}
}
};
void
nsLayoutUtils::GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback, uint32_t aFlags)
{
BoxToRect converter(aRelativeTo, aCallback, aFlags);
GetAllInFlowBoxes(aFrame, &converter);
}
void
nsLayoutUtils::GetAllInFlowRectsAndTexts(nsIFrame* aFrame, nsIFrame* aRelativeTo,
RectCallback* aCallback,
Sequence<nsString>* aTextList,
uint32_t aFlags)
{
BoxToRectAndText converter(aRelativeTo, aCallback, aTextList, aFlags);
GetAllInFlowBoxes(aFrame, &converter);
}
nsLayoutUtils::RectAccumulator::RectAccumulator() : mSeenFirstRect(false) {}
void nsLayoutUtils::RectAccumulator::AddRect(const nsRect& aRect) {
mResultRect.UnionRect(mResultRect, aRect);
if (!mSeenFirstRect) {
mSeenFirstRect = true;
mFirstRect = aRect;
}
}
nsLayoutUtils::RectListBuilder::RectListBuilder(DOMRectList* aList)
: mRectList(aList)
{
}
void nsLayoutUtils::RectListBuilder::AddRect(const nsRect& aRect) {
RefPtr<DOMRect> rect = new DOMRect(mRectList);
rect->SetLayoutRect(aRect);
mRectList->Append(rect);
}
nsIFrame* nsLayoutUtils::GetContainingBlockForClientRect(nsIFrame* aFrame)
{
return aFrame->PresShell()->GetRootFrame();
}
nsRect
nsLayoutUtils::GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo,
uint32_t aFlags) {
RectAccumulator accumulator;
GetAllInFlowRects(aFrame, aRelativeTo, &accumulator, aFlags);
return accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect
: accumulator.mResultRect;
}
nsRect
nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame,
uint32_t aFlags)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow())
return aTextAndDecorationsRect;
nsRect resultRect = aTextAndDecorationsRect;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < textStyle->mTextShadow->Length(); ++i) {
nsCSSShadowItem* shadow = textStyle->mTextShadow->ShadowAt(i);
nsMargin blur = nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D);
if ((aFlags & EXCLUDE_BLUR_SHADOWS) && blur != nsMargin(0, 0, 0, 0))
continue;
nsRect tmpRect(aTextAndDecorationsRect);
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(blur);
resultRect.UnionRect(resultRect, tmpRect);
}
return resultRect;
}
enum ObjectDimensionType { eWidth, eHeight };
static nscoord
ComputeMissingDimension(const nsSize& aDefaultObjectSize,
const nsSize& aIntrinsicRatio,
const Maybe<nscoord>& aSpecifiedWidth,
const Maybe<nscoord>& aSpecifiedHeight,
ObjectDimensionType aDimensionToCompute)
{
// The "default sizing algorithm" computes the missing dimension as follows:
// (source: http://dev.w3.org/csswg/css-images-3/#default-sizing )
// 1. "If the object has an intrinsic aspect ratio, the missing dimension of
// the concrete object size is calculated using the intrinsic aspect
// ratio and the present dimension."
if (aIntrinsicRatio.width > 0 && aIntrinsicRatio.height > 0) {
// Fill in the missing dimension using the intrinsic aspect ratio.
nscoord knownDimensionSize;
float ratio;
if (aDimensionToCompute == eWidth) {
knownDimensionSize = *aSpecifiedHeight;
ratio = aIntrinsicRatio.width / aIntrinsicRatio.height;
} else {
knownDimensionSize = *aSpecifiedWidth;
ratio = aIntrinsicRatio.height / aIntrinsicRatio.width;
}
return NSCoordSaturatingNonnegativeMultiply(knownDimensionSize, ratio);
}
// 2. "Otherwise, if the missing dimension is present in the object’s
// intrinsic dimensions, [...]"
// NOTE: *Skipping* this case, because we already know it's not true -- we're
// in this function because the missing dimension is *not* present in
// the object's intrinsic dimensions.
// 3. "Otherwise, the missing dimension of the concrete object size is taken
// from the default object size. "
return (aDimensionToCompute == eWidth) ?
aDefaultObjectSize.width : aDefaultObjectSize.height;
}
/*
* This computes & returns the concrete object size of replaced content, if
* that content were to be rendered with "object-fit: none". (Or, if the
* element has neither an intrinsic height nor width, this method returns an
* empty Maybe<> object.)
*
* As specced...
* http://dev.w3.org/csswg/css-images-3/#valdef-object-fit-none
* ..we use "the default sizing algorithm with no specified size,
* and a default object size equal to the replaced element's used width and
* height."
*
* The default sizing algorithm is described here:
* http://dev.w3.org/csswg/css-images-3/#default-sizing
* Quotes in the function-impl are taken from that ^ spec-text.
*
* Per its final bulleted section: since there's no specified size,
* we run the default sizing algorithm using the object's intrinsic size in
* place of the specified size. But if the object has neither an intrinsic
* height nor an intrinsic width, then we instead return without populating our
* outparam, and we let the caller figure out the size (using a contain
* constraint).
*/
static Maybe<nsSize>
MaybeComputeObjectFitNoneSize(const nsSize& aDefaultObjectSize,
const IntrinsicSize& aIntrinsicSize,
const nsSize& aIntrinsicRatio)
{
// "If the object has an intrinsic height or width, its size is resolved as
// if its intrinsic dimensions were given as the specified size."
//
// So, first we check if we have an intrinsic height and/or width:
Maybe<nscoord> specifiedWidth;
if (aIntrinsicSize.width.GetUnit() == eStyleUnit_Coord) {
specifiedWidth.emplace(aIntrinsicSize.width.GetCoordValue());
}
Maybe<nscoord> specifiedHeight;
if (aIntrinsicSize.height.GetUnit() == eStyleUnit_Coord) {
specifiedHeight.emplace(aIntrinsicSize.height.GetCoordValue());
}
Maybe<nsSize> noneSize; // (the value we'll return)
if (specifiedWidth || specifiedHeight) {
// We have at least one specified dimension; use whichever dimension is
// specified, and compute the other one using our intrinsic ratio, or (if
// no valid ratio) using the default object size.
noneSize.emplace();
noneSize->width = specifiedWidth ?
*specifiedWidth :
ComputeMissingDimension(aDefaultObjectSize, aIntrinsicRatio,
specifiedWidth, specifiedHeight,
eWidth);
noneSize->height = specifiedHeight ?
*specifiedHeight :
ComputeMissingDimension(aDefaultObjectSize, aIntrinsicRatio,
specifiedWidth, specifiedHeight,
eHeight);
}
// [else:] "Otherwise [if there's neither an intrinsic height nor width], its
// size is resolved as a contain constraint against the default object size."
// We'll let our caller do that, to share code & avoid redundant
// computations; so, we return w/out populating noneSize.
return noneSize;
}
// Computes the concrete object size to render into, as described at
// http://dev.w3.org/csswg/css-images-3/#concrete-size-resolution
static nsSize
ComputeConcreteObjectSize(const nsSize& aConstraintSize,
const IntrinsicSize& aIntrinsicSize,
const nsSize& aIntrinsicRatio,
uint8_t aObjectFit)
{
// Handle default behavior (filling the container) w/ fast early return.
// (Also: if there's no valid intrinsic ratio, then we have the "fill"
// behavior & just use the constraint size.)
if (MOZ_LIKELY(aObjectFit == NS_STYLE_OBJECT_FIT_FILL) ||
aIntrinsicRatio.width == 0 ||
aIntrinsicRatio.height == 0) {
return aConstraintSize;
}
// The type of constraint to compute (cover/contain), if needed:
Maybe<nsImageRenderer::FitType> fitType;
Maybe<nsSize> noneSize;
if (aObjectFit == NS_STYLE_OBJECT_FIT_NONE ||
aObjectFit == NS_STYLE_OBJECT_FIT_SCALE_DOWN) {
noneSize = MaybeComputeObjectFitNoneSize(aConstraintSize, aIntrinsicSize,
aIntrinsicRatio);
if (!noneSize || aObjectFit == NS_STYLE_OBJECT_FIT_SCALE_DOWN) {
// Need to compute a 'CONTAIN' constraint (either for the 'none' size
// itself, or for comparison w/ the 'none' size to resolve 'scale-down'.)
fitType.emplace(nsImageRenderer::CONTAIN);
}
} else if (aObjectFit == NS_STYLE_OBJECT_FIT_COVER) {
fitType.emplace(nsImageRenderer::COVER);
} else if (aObjectFit == NS_STYLE_OBJECT_FIT_CONTAIN) {
fitType.emplace(nsImageRenderer::CONTAIN);
}
Maybe<nsSize> constrainedSize;
if (fitType) {
constrainedSize.emplace(
nsImageRenderer::ComputeConstrainedSize(aConstraintSize,
aIntrinsicRatio,
*fitType));
}
// Now, we should have all the sizing information that we need.
switch (aObjectFit) {
// skipping NS_STYLE_OBJECT_FIT_FILL; we handled it w/ early-return.
case NS_STYLE_OBJECT_FIT_CONTAIN:
case NS_STYLE_OBJECT_FIT_COVER:
MOZ_ASSERT(constrainedSize);
return *constrainedSize;
case NS_STYLE_OBJECT_FIT_NONE:
if (noneSize) {
return *noneSize;
}
MOZ_ASSERT(constrainedSize);
return *constrainedSize;
case NS_STYLE_OBJECT_FIT_SCALE_DOWN:
MOZ_ASSERT(constrainedSize);
if (noneSize) {
constrainedSize->width =
std::min(constrainedSize->width, noneSize->width);
constrainedSize->height =
std::min(constrainedSize->height, noneSize->height);
}
return *constrainedSize;
default:
MOZ_ASSERT_UNREACHABLE("Unexpected enum value for 'object-fit'");
return aConstraintSize; // fall back to (default) 'fill' behavior
}
}
// (Helper for HasInitialObjectFitAndPosition, to check
// each "object-position" coord.)
static bool
IsCoord50Pct(const mozilla::Position::Coord& aCoord)
{
return (aCoord.mLength == 0 &&
aCoord.mHasPercent &&
aCoord.mPercent == 0.5f);
}
// Indicates whether the given nsStylePosition has the initial values
// for the "object-fit" and "object-position" properties.
static bool
HasInitialObjectFitAndPosition(const nsStylePosition* aStylePos)
{
const mozilla::Position& objectPos = aStylePos->mObjectPosition;
return aStylePos->mObjectFit == NS_STYLE_OBJECT_FIT_FILL &&
IsCoord50Pct(objectPos.mXPosition) &&
IsCoord50Pct(objectPos.mYPosition);
}
/* static */ nsRect
nsLayoutUtils::ComputeObjectDestRect(const nsRect& aConstraintRect,
const IntrinsicSize& aIntrinsicSize,
const nsSize& aIntrinsicRatio,
const nsStylePosition* aStylePos,
nsPoint* aAnchorPoint)
{
// Step 1: Figure out our "concrete object size"
// (the size of the region we'll actually draw our image's pixels into).
nsSize concreteObjectSize =
ComputeConcreteObjectSize(aConstraintRect.Size(), aIntrinsicSize,
aIntrinsicRatio, aStylePos->mObjectFit);
// Step 2: Figure out how to align that region in the element's content-box.
nsPoint imageTopLeftPt, imageAnchorPt;
nsImageRenderer::ComputeObjectAnchorPoint(aStylePos->mObjectPosition,
aConstraintRect.Size(),
concreteObjectSize,
&imageTopLeftPt, &imageAnchorPt);
// Right now, we're with respect to aConstraintRect's top-left point. We add
// that point here, to convert to the same broader coordinate space that
// aConstraintRect is in.
imageTopLeftPt += aConstraintRect.TopLeft();
imageAnchorPt += aConstraintRect.TopLeft();
if (aAnchorPoint) {
// Special-case: if our "object-fit" and "object-position" properties have
// their default values ("object-fit: fill; object-position:50% 50%"), then
// we'll override the calculated imageAnchorPt, and instead use the
// object's top-left corner.
//
// This special case is partly for backwards compatibility (since
// traditionally we've pixel-aligned the top-left corner of e.g. <img>
// elements), and partly because ComputeSnappedDrawingParameters produces
// less error if the anchor point is at the top-left corner. So, all other
// things being equal, we prefer that code path with less error.
if (HasInitialObjectFitAndPosition(aStylePos)) {
*aAnchorPoint = imageTopLeftPt;
} else {
*aAnchorPoint = imageAnchorPt;
}
}
return nsRect(imageTopLeftPt, concreteObjectSize);
}
already_AddRefed<nsFontMetrics>
nsLayoutUtils::GetFontMetricsForFrame(const nsIFrame* aFrame, float aInflation)
{
nsStyleContext* styleContext = aFrame->StyleContext();
uint8_t variantWidth = NS_FONT_VARIANT_WIDTH_NORMAL;
if (styleContext->IsTextCombined()) {
MOZ_ASSERT(aFrame->IsTextFrame());
auto textFrame = static_cast<const nsTextFrame*>(aFrame);
auto clusters = textFrame->CountGraphemeClusters();
if (clusters == 2) {
variantWidth = NS_FONT_VARIANT_WIDTH_HALF;
} else if (clusters == 3) {
variantWidth = NS_FONT_VARIANT_WIDTH_THIRD;
} else if (clusters == 4) {
variantWidth = NS_FONT_VARIANT_WIDTH_QUARTER;
}
}
return GetFontMetricsForStyleContext(styleContext, aInflation, variantWidth);
}
already_AddRefed<nsFontMetrics>
nsLayoutUtils::GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
float aInflation,
uint8_t aVariantWidth)
{
nsPresContext* pc = aStyleContext->PresContext();
WritingMode wm(aStyleContext);
const nsStyleFont* styleFont = aStyleContext->StyleFont();
nsFontMetrics::Params params;
params.language = styleFont->mLanguage;
params.explicitLanguage = styleFont->mExplicitLanguage;
params.orientation =
wm.IsVertical() && !wm.IsSideways() ? gfxFont::eVertical
: gfxFont::eHorizontal;
// pass the user font set object into the device context to
// pass along to CreateFontGroup
params.userFontSet = pc->GetUserFontSet();
params.textPerf = pc->GetTextPerfMetrics();
// When aInflation is 1.0 and we don't require width variant, avoid
// making a local copy of the nsFont.
// This also avoids running font.size through floats when it is large,
// which would be lossy. Fortunately, in such cases, aInflation is
// guaranteed to be 1.0f.
if (aInflation == 1.0f && aVariantWidth == NS_FONT_VARIANT_WIDTH_NORMAL) {
return pc->DeviceContext()->GetMetricsFor(styleFont->mFont, params);
}
nsFont font = styleFont->mFont;
font.size = NSToCoordRound(font.size * aInflation);
font.variantWidth = aVariantWidth;
return pc->DeviceContext()->GetMetricsFor(font, params);
}
nsIFrame*
nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame)
{
nsIFrame* result = aDescendantFrame;
while (result) {
nsIFrame* parent = result->GetParent();
if (parent == aParent) {
break;
}
// The frame is not an immediate child of aParent so walk up another level
result = parent;
}
return result;
}
nsBlockFrame*
nsLayoutUtils::GetAsBlock(nsIFrame* aFrame)
{
nsBlockFrame* block = do_QueryFrame(aFrame);
return block;
}
nsBlockFrame*
nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame)
{
nsIFrame* nextAncestor;
for (nextAncestor = aFrame->GetParent(); nextAncestor;
nextAncestor = nextAncestor->GetParent()) {
nsBlockFrame* block = GetAsBlock(nextAncestor);
if (block)
return block;
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::GetNonGeneratedAncestor(nsIFrame* aFrame)
{
if (!(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT))
return aFrame;
nsIFrame* f = aFrame;
do {
f = GetParentOrPlaceholderFor(f);
} while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT);
return f;
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderFor(nsIFrame* aFrame)
{
if ((aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
&& !aFrame->GetPrevInFlow()) {
return aFrame->GetProperty(nsIFrame::PlaceholderFrameProperty());
}
return aFrame->GetParent();
}
nsIFrame*
nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(nsIFrame* aFrame)
{
nsIFrame* f = GetParentOrPlaceholderFor(aFrame);
if (f)
return f;
return GetCrossDocParentFrame(aFrame);
}
nsIFrame*
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(nsIFrame *aFrame)
{
nsIFrame *result = aFrame->GetNextContinuation();
if (result)
return result;
if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) != 0) {
// We only store the ib-split sibling annotation with the first
// frame in the continuation chain. Walk back to find that frame now.
aFrame = aFrame->FirstContinuation();
return aFrame->GetProperty(nsIFrame::IBSplitSibling());
}
return nullptr;
}
nsIFrame*
nsLayoutUtils::FirstContinuationOrIBSplitSibling(const nsIFrame* aFrame)
{
nsIFrame* result = aFrame->FirstContinuation();
if (result->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
while (auto* f = result->GetProperty(nsIFrame::IBSplitPrevSibling())) {
result = f;
}
}
return result;
}
nsIFrame*
nsLayoutUtils::LastContinuationOrIBSplitSibling(const nsIFrame* aFrame)
{
nsIFrame* result = aFrame->FirstContinuation();
if (result->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
while (auto* f = result->GetProperty(nsIFrame::IBSplitSibling())) {
result = f;
}
}
return result->LastContinuation();
}
bool
nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(nsIFrame *aFrame)
{
if (aFrame->GetPrevContinuation()) {
return false;
}
if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) &&
aFrame->GetProperty(nsIFrame::IBSplitPrevSibling())) {
return false;
}
return true;
}
bool
nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame)
{
if (!aFrame)
return false;
nsIFrame* rootScrollFrame = aFrame->PresShell()->GetRootScrollFrame();
if (!rootScrollFrame)
return false;
nsIScrollableFrame* rootScrollableFrame = do_QueryFrame(rootScrollFrame);
NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null");
if (!IsProperAncestorFrame(rootScrollFrame, aFrame))
return false;
nsIFrame* rootScrolledFrame = rootScrollableFrame->GetScrolledFrame();
return !(rootScrolledFrame == aFrame ||
IsProperAncestorFrame(rootScrolledFrame, aFrame));
}
// Use only for widths/heights (or their min/max), since it clamps
// negative calc() results to 0.
static bool GetAbsoluteCoord(const nsStyleCoord& aStyle, nscoord& aResult)
{
if (aStyle.IsCalcUnit()) {
if (aStyle.CalcHasPercent()) {
return false;
}
// If it has no percents, we can pass 0 for the percentage basis.
aResult = aStyle.ComputeComputedCalc(0);
if (aResult < 0)
aResult = 0;
return true;
}
if (eStyleUnit_Coord != aStyle.GetUnit())
return false;
aResult = aStyle.GetCoordValue();
NS_ASSERTION(aResult >= 0, "negative widths not allowed");
return true;
}
static nscoord
GetBSizeTakenByBoxSizing(StyleBoxSizing aBoxSizing,
nsIFrame* aFrame,
bool aHorizontalAxis,
bool aIgnorePadding);
// Only call on style coords for which GetAbsoluteCoord returned false.
static bool
GetPercentBSize(const nsStyleCoord& aStyle,
nsIFrame* aFrame,
bool aHorizontalAxis,
nscoord& aResult)
{
if (eStyleUnit_Percent != aStyle.GetUnit() &&
!aStyle.IsCalcUnit())
return false;
MOZ_ASSERT(!aStyle.IsCalcUnit() || aStyle.CalcHasPercent(),
"GetAbsoluteCoord should have handled this");
// During reflow, nsHTMLScrollFrame::ReflowScrolledFrame uses
// SetComputedHeight on the reflow state for its child to propagate its
// computed height to the scrolled content. So here we skip to the scroll
// frame that contains this scrolled content in order to get the same
// behavior as layout when computing percentage heights.
nsIFrame *f = aFrame->GetContainingBlock(nsIFrame::SKIP_SCROLLED_FRAME);
if (!f) {
NS_NOTREACHED("top of frame tree not a containing block");
return false;
}
WritingMode wm = f->GetWritingMode();
const nsStylePosition *pos = f->StylePosition();
const nsStyleCoord& bSizeCoord = pos->BSize(wm);
nscoord h;
if (!GetAbsoluteCoord(bSizeCoord, h) &&
!GetPercentBSize(bSizeCoord, f, aHorizontalAxis, h)) {
NS_ASSERTION(bSizeCoord.GetUnit() == eStyleUnit_Auto ||
bSizeCoord.HasPercent(),
"unknown block-size unit");
LayoutFrameType fType = f->Type();
if (fType != LayoutFrameType::Viewport &&
fType != LayoutFrameType::Canvas &&
fType != LayoutFrameType::PageContent) {
// There's no basis for the percentage height, so it acts like auto.
// Should we consider a max-height < min-height pair a basis for
// percentage heights? The spec is somewhat unclear, and not doing
// so is simpler and avoids troubling discontinuities in behavior,
// so I'll choose not to. -LDB
return false;
}
NS_ASSERTION(bSizeCoord.GetUnit() == eStyleUnit_Auto,
"Unexpected block-size unit for viewport or canvas or page-content");
// For the viewport, canvas, and page-content kids, the percentage
// basis is just the parent block-size.
h = f->BSize(wm);
if (h == NS_UNCONSTRAINEDSIZE) {
// We don't have a percentage basis after all
return false;
}
}
const nsStyleCoord& maxBSizeCoord = pos->MaxBSize(wm);
nscoord maxh;
if (GetAbsoluteCoord(maxBSizeCoord, maxh) ||
GetPercentBSize(maxBSizeCoord, f, aHorizontalAxis, maxh)) {
if (maxh < h)
h = maxh;
} else {
NS_ASSERTION(maxBSizeCoord.GetUnit() == eStyleUnit_None ||
maxBSizeCoord.HasPercent(),
"unknown max block-size unit");
}
const nsStyleCoord& minBSizeCoord = pos->MinBSize(wm);
nscoord minh;
if (GetAbsoluteCoord(minBSizeCoord, minh) ||
GetPercentBSize(minBSizeCoord, f, aHorizontalAxis, minh)) {
if (minh > h)
h = minh;
} else {
NS_ASSERTION(minBSizeCoord.HasPercent() ||
minBSizeCoord.GetUnit() == eStyleUnit_Auto,
"unknown min block-size unit");
}
// Now adjust h for box-sizing styles on the parent. We never ignore padding
// here. That could conceivably cause some problems with fieldsets (which are
// the one place that wants to ignore padding), but solving that here without
// hardcoding a check for f being a fieldset-content frame is a bit of a pain.
nscoord bSizeTakenByBoxSizing =
GetBSizeTakenByBoxSizing(pos->mBoxSizing, f, aHorizontalAxis, false);
h = std::max(0, h - bSizeTakenByBoxSizing);
if (aStyle.IsCalcUnit()) {
aResult = std::max(aStyle.ComputeComputedCalc(h), 0);
return true;
}
aResult = NSToCoordRound(aStyle.GetPercentValue() * h);
return true;
}
// Return true if aStyle can be resolved to a definite value and if so
// return that value in aResult.
static bool
GetDefiniteSize(const nsStyleCoord& aStyle,
nsIFrame* aFrame,
bool aIsInlineAxis,
const Maybe<LogicalSize>& aPercentageBasis,
nscoord* aResult)
{
switch (aStyle.GetUnit()) {
case eStyleUnit_Coord:
*aResult = aStyle.GetCoordValue();
return true;
case eStyleUnit_Percent: {
if (aPercentageBasis.isNothing()) {
return false;
}
auto wm = aFrame->GetWritingMode();
nscoord pb = aIsInlineAxis ? aPercentageBasis.value().ISize(wm)
: aPercentageBasis.value().BSize(wm);
if (pb != NS_UNCONSTRAINEDSIZE) {
nscoord p = NSToCoordFloorClamped(pb * aStyle.GetPercentValue());
*aResult = std::max(nscoord(0), p);
return true;
}
return false;
}
case eStyleUnit_Calc: {
nsStyleCoord::Calc* calc = aStyle.GetCalcValue();
if (calc->mPercent != 0.0f) {
if (aPercentageBasis.isNothing()) {
return false;
}
auto wm = aFrame->GetWritingMode();
nscoord pb = aIsInlineAxis ? aPercentageBasis.value().ISize(wm)
: aPercentageBasis.value().BSize(wm);
if (pb == NS_UNCONSTRAINEDSIZE) {
// XXXmats given that we're calculating an intrinsic size here,
// maybe we should back-compute the calc-size using AddPercents?
return false;
}
*aResult = std::max(0, calc->mLength +
NSToCoordFloorClamped(pb * calc->mPercent));
} else {
*aResult = std::max(0, calc->mLength);
}
return true;
}
default:
return false;
}
}
//
// NOTE: this function will be replaced by GetDefiniteSizeTakenByBoxSizing (bug 1363918).
// Please do not add new uses of this function.
//
// Get the amount of vertical space taken out of aFrame's content area due to
// its borders and paddings given the box-sizing value in aBoxSizing. We don't
// get aBoxSizing from the frame because some callers want to compute this for
// specific box-sizing values. aHorizontalAxis is true if our inline direction
// is horisontal and our block direction is vertical. aIgnorePadding is true if
// padding should be ignored.
static nscoord
GetBSizeTakenByBoxSizing(StyleBoxSizing aBoxSizing,
nsIFrame* aFrame,
bool aHorizontalAxis,
bool aIgnorePadding)
{
nscoord bSizeTakenByBoxSizing = 0;
if (aBoxSizing == StyleBoxSizing::Border) {
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
bSizeTakenByBoxSizing +=
aHorizontalAxis ? styleBorder->GetComputedBorder().TopBottom()
: styleBorder->GetComputedBorder().LeftRight();
if (!aIgnorePadding) {
const nsStyleSides& stylePadding =
aFrame->StylePadding()->mPadding;
const nsStyleCoord& paddingStart =
stylePadding.Get(aHorizontalAxis ? eSideTop : eSideLeft);
const nsStyleCoord& paddingEnd =
stylePadding.Get(aHorizontalAxis ? eSideBottom : eSideRight);
nscoord pad;
// XXXbz Calling GetPercentBSize on padding values looks bogus, since
// percent padding is always a percentage of the inline-size of the
// containing block. We should perhaps just treat non-absolute paddings
// here as 0 instead, except that in some cases the width may in fact be
// known. See bug 1231059.
if (GetAbsoluteCoord(paddingStart, pad) ||
GetPercentBSize(paddingStart, aFrame, aHorizontalAxis, pad)) {
bSizeTakenByBoxSizing += pad;
}
if (GetAbsoluteCoord(paddingEnd, pad) ||
GetPercentBSize(paddingEnd, aFrame, aHorizontalAxis, pad)) {
bSizeTakenByBoxSizing += pad;
}
}
}
return bSizeTakenByBoxSizing;
}
// Get the amount of space taken out of aFrame's content area due to its
// borders and paddings given the box-sizing value in aBoxSizing. We don't
// get aBoxSizing from the frame because some callers want to compute this for
// specific box-sizing values.
// aIsInlineAxis is true if we're computing for aFrame's inline axis.
// aIgnorePadding is true if padding should be ignored.
static nscoord
GetDefiniteSizeTakenByBoxSizing(StyleBoxSizing aBoxSizing,
nsIFrame* aFrame,
bool aIsInlineAxis,
bool aIgnorePadding,
const Maybe<LogicalSize>& aPercentageBasis)
{
nscoord sizeTakenByBoxSizing = 0;
if (MOZ_UNLIKELY(aBoxSizing == StyleBoxSizing::Border)) {
const bool isHorizontalAxis =
aIsInlineAxis == !aFrame->GetWritingMode().IsVertical();
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
sizeTakenByBoxSizing =
isHorizontalAxis ? styleBorder->GetComputedBorder().LeftRight()
: styleBorder->GetComputedBorder().TopBottom();
if (!aIgnorePadding) {
const nsStyleSides& stylePadding = aFrame->StylePadding()->mPadding;
const nsStyleCoord& pStart =
stylePadding.Get(isHorizontalAxis ? eSideLeft : eSideTop);
const nsStyleCoord& pEnd =
stylePadding.Get(isHorizontalAxis ? eSideRight : eSideBottom);
nscoord pad;
// XXXbz Calling GetPercentBSize on padding values looks bogus, since
// percent padding is always a percentage of the inline-size of the
// containing block. We should perhaps just treat non-absolute paddings
// here as 0 instead, except that in some cases the width may in fact be
// known. See bug 1231059.
if (GetDefiniteSize(pStart, aFrame, aIsInlineAxis, aPercentageBasis, &pad) ||
(aPercentageBasis.isNothing() &&
GetPercentBSize(pStart, aFrame, isHorizontalAxis, pad))) {
sizeTakenByBoxSizing += pad;
}
if (GetDefiniteSize(pEnd, aFrame, aIsInlineAxis, aPercentageBasis, &pad) ||
(aPercentageBasis.isNothing() &&
GetPercentBSize(pEnd, aFrame, isHorizontalAxis, pad))) {
sizeTakenByBoxSizing += pad;
}
}
}
return sizeTakenByBoxSizing;
}
// Handles only -moz-max-content and -moz-min-content, and
// -moz-fit-content for min-width and max-width, since the others
// (-moz-fit-content for width, and -moz-available) have no effect on
// intrinsic widths.
enum eWidthProperty { PROP_WIDTH, PROP_MAX_WIDTH, PROP_MIN_WIDTH };
static bool
GetIntrinsicCoord(const nsStyleCoord& aStyle,
gfxContext* aRenderingContext,
nsIFrame* aFrame,
eWidthProperty aProperty,
nscoord& aResult)
{
NS_PRECONDITION(aProperty == PROP_WIDTH || aProperty == PROP_MAX_WIDTH ||
aProperty == PROP_MIN_WIDTH, "unexpected property");
if (aStyle.GetUnit() != eStyleUnit_Enumerated)
return false;
int32_t val = aStyle.GetIntValue();
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT ||
val == NS_STYLE_WIDTH_FIT_CONTENT ||
val == NS_STYLE_WIDTH_AVAILABLE,
"unexpected enumerated value for width property");
if (val == NS_STYLE_WIDTH_AVAILABLE)
return false;
if (val == NS_STYLE_WIDTH_FIT_CONTENT) {
if (aProperty == PROP_WIDTH)
return false; // handle like 'width: auto'
if (aProperty == PROP_MAX_WIDTH)
// constrain large 'width' values down to -moz-max-content
val = NS_STYLE_WIDTH_MAX_CONTENT;
else
// constrain small 'width' or 'max-width' values up to -moz-min-content
val = NS_STYLE_WIDTH_MIN_CONTENT;
}
NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
val == NS_STYLE_WIDTH_MIN_CONTENT,
"should have reduced everything remaining to one of these");
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
if (val == NS_STYLE_WIDTH_MAX_CONTENT)
aResult = aFrame->GetPrefISize(aRenderingContext);
else
aResult = aFrame->GetMinISize(aRenderingContext);
return true;
}
#undef DEBUG_INTRINSIC_WIDTH
#ifdef DEBUG_INTRINSIC_WIDTH
static int32_t gNoiseIndent = 0;
#endif
// Return true for form controls whose minimum intrinsic inline-size
// shrinks to 0 when they have a percentage inline-size (but not
// percentage max-inline-size). (Proper replaced elements, whose
// intrinsic minimium inline-size shrinks to 0 for both percentage
// inline-size and percentage max-inline-size, are handled elsewhere.)
inline static bool
FormControlShrinksForPercentISize(nsIFrame* aFrame)
{
if (!aFrame->IsFrameOfType(nsIFrame::eReplaced)) {
// Quick test to reject most frames.
return false;
}
LayoutFrameType fType = aFrame->Type();
if (fType == LayoutFrameType::Meter || fType == LayoutFrameType::Progress) {
// progress and meter do have this shrinking behavior
// FIXME: Maybe these should be nsIFormControlFrame?
return true;
}
if (!static_cast<nsIFormControlFrame*>(do_QueryFrame(aFrame))) {
// Not a form control. This includes fieldsets, which do not
// shrink.
return false;
}
if (fType == LayoutFrameType::GfxButtonControl ||
fType == LayoutFrameType::HTMLButtonControl) {
// Buttons don't have this shrinking behavior. (Note that color
// inputs do, even though they inherit from button, so we can't use
// do_QueryFrame here.)
return false;
}
return true;
}
/**
* Add aOffsets which describes what to add on outside of the content box
* aContentSize (controlled by 'box-sizing') and apply min/max properties.
* We have to account for these properties after getting all the offsets
* (margin, border, padding) because percentages do not operate linearly.
* Doing this is ok because although percentages aren't handled linearly,
* they are handled monotonically.
*
* @param aContentSize the content size calculated so far
(@see IntrinsicForContainer)
* @param aContentMinSize ditto min content size
* @param aStyleSize a 'width' or 'height' property value
* @param aFixedMinSize if aStyleMinSize is a definite size then this points to
* the value, otherwise nullptr
* @param aStyleMinSize a 'min-width' or 'min-height' property value
* @param aFixedMaxSize if aStyleMaxSize is a definite size then this points to
* the value, otherwise nullptr
* @param aStyleMaxSize a 'max-width' or 'max-height' property value
* @param aFlags same as for IntrinsicForContainer
* @param aContainerWM the container's WM
*/
static nscoord
AddIntrinsicSizeOffset(gfxContext* aRenderingContext,
nsIFrame* aFrame,
const nsIFrame::IntrinsicISizeOffsetData& aOffsets,
nsLayoutUtils::IntrinsicISizeType aType,
StyleBoxSizing aBoxSizing,
nscoord aContentSize,
nscoord aContentMinSize,
const nsStyleCoord& aStyleSize,
const nscoord* aFixedMinSize,
const nsStyleCoord& aStyleMinSize,
const nscoord* aFixedMaxSize,
const nsStyleCoord& aStyleMaxSize,
uint32_t aFlags,
PhysicalAxis aAxis)
{
nscoord result = aContentSize;
nscoord min = aContentMinSize;
nscoord coordOutsideSize = 0;
float pctOutsideSize = 0;
float pctTotal = 0.0f;
if (!(aFlags & nsLayoutUtils::IGNORE_PADDING)) {
coordOutsideSize += aOffsets.hPadding;
pctOutsideSize += aOffsets.hPctPadding;
}
coordOutsideSize += aOffsets.hBorder;
if (aBoxSizing == StyleBoxSizing::Border) {
min += coordOutsideSize;
result = NSCoordSaturatingAdd(result, coordOutsideSize);
pctTotal += pctOutsideSize;
coordOutsideSize = 0;
pctOutsideSize = 0.0f;
}
coordOutsideSize += aOffsets.hMargin;
pctOutsideSize += aOffsets.hPctMargin;
min += coordOutsideSize;
result = NSCoordSaturatingAdd(result, coordOutsideSize);
pctTotal += pctOutsideSize;
const bool shouldAddPercent = aType == nsLayoutUtils::PREF_ISIZE ||
(aFlags & nsLayoutUtils::ADD_PERCENTS);
nscoord size;
if (aType == nsLayoutUtils::MIN_ISIZE &&
(((aStyleSize.HasPercent() || aStyleMaxSize.HasPercent()) &&
aFrame->IsFrameOfType(nsIFrame::eReplacedSizing)) ||
(aStyleSize.HasPercent() &&
FormControlShrinksForPercentISize(aFrame)))) {
// A percentage width or max-width on replaced elements means they
// can shrink to 0.
// This is also true for percentage widths (but not max-widths) on
// text inputs.
// Note that if this is max-width, this overrides the fixed-width
// rule in the next condition.
result = 0; // let |min| handle padding/border/margin
} else if (GetAbsoluteCoord(aStyleSize, size) ||
GetIntrinsicCoord(aStyleSize, aRenderingContext, aFrame,
PROP_WIDTH, size)) {
result = size + coordOutsideSize;
if (shouldAddPercent) {
result = nsLayoutUtils::AddPercents(result, pctOutsideSize);
}
} else {
// NOTE: We could really do a lot better for percents and for some
// cases of calc() containing percent (certainly including any where
// the coefficient on the percent is positive and there are no max()
// expressions). However, doing better for percents wouldn't be
// backwards compatible.
if (shouldAddPercent) {
result = nsLayoutUtils::AddPercents(result, pctTotal);
}
}
nscoord maxSize = aFixedMaxSize ? *aFixedMaxSize : 0;
if (aFixedMaxSize ||
GetIntrinsicCoord(aStyleMaxSize, aRenderingContext, aFrame,
PROP_MAX_WIDTH, maxSize)) {
maxSize += coordOutsideSize;
if (shouldAddPercent) {
maxSize = nsLayoutUtils::AddPercents(maxSize, pctOutsideSize);
}
if (result > maxSize) {
result = maxSize;
}
}
nscoord minSize = aFixedMinSize ? *aFixedMinSize : 0;
if (aFixedMinSize ||
GetIntrinsicCoord(aStyleMinSize, aRenderingContext, aFrame,
PROP_MIN_WIDTH, minSize)) {
minSize += coordOutsideSize;
if (shouldAddPercent) {
minSize = nsLayoutUtils::AddPercents(minSize, pctOutsideSize);
}
if (result < minSize) {
result = minSize;
}
}
if (shouldAddPercent) {
min = nsLayoutUtils::AddPercents(min, pctTotal);
}
if (result < min) {
result = min;
}
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if (aFrame->IsThemed(disp)) {
LayoutDeviceIntSize devSize;
bool canOverride = true;
nsPresContext* pc = aFrame->PresContext();
pc->GetTheme()->GetMinimumWidgetSize(pc, aFrame, disp->mAppearance,
&devSize, &canOverride);
nscoord themeSize =
pc->DevPixelsToAppUnits(aAxis == eAxisVertical ? devSize.height
: devSize.width);
// GetMinimumWidgetSize() returns a border-box width.
themeSize += aOffsets.hMargin;
if (shouldAddPercent) {
themeSize = nsLayoutUtils::AddPercents(themeSize, aOffsets.hPctMargin);
}
if (themeSize > result || !canOverride) {
result = themeSize;
}
}
return result;
}
static void
AddStateBitToAncestors(nsIFrame* aFrame, nsFrameState aBit)
{
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
if (f->HasAnyStateBits(aBit)) {
break;
}
f->AddStateBits(aBit);
}
}
/* static */ nscoord
nsLayoutUtils::IntrinsicForAxis(PhysicalAxis aAxis,
gfxContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicISizeType aType,
const Maybe<LogicalSize>& aPercentageBasis,
uint32_t aFlags,
nscoord aMarginBoxMinSizeClamp)
{
NS_PRECONDITION(aFrame, "null frame");
NS_PRECONDITION(aFrame->GetParent(),
"IntrinsicForAxis called on frame not in tree");
NS_PRECONDITION(aType == MIN_ISIZE || aType == PREF_ISIZE, "bad type");
MOZ_ASSERT(aFrame->GetParent()->Type() != LayoutFrameType::GridContainer ||
aPercentageBasis.isSome(),
"grid layout should always pass a percentage basis");
const bool horizontalAxis = MOZ_LIKELY(aAxis == eAxisHorizontal);
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s %s intrinsic size for container:\n",
aType == MIN_ISIZE ? "min" : "pref",
horizontalAxis ? "horizontal" : "vertical");
#endif
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
// We want the size this frame will contribute to the parent's inline-size,
// so we work in the parent's writing mode; but if aFrame is orthogonal to
// its parent, we'll need to look at its BSize instead of min/pref-ISize.
const nsStylePosition* stylePos = aFrame->StylePosition();
StyleBoxSizing boxSizing = stylePos->mBoxSizing;
const nsStyleCoord& styleMinISize =
horizontalAxis ? stylePos->mMinWidth : stylePos->mMinHeight;
const nsStyleCoord& styleISize =
(aFlags & MIN_INTRINSIC_ISIZE) ? styleMinISize :
(horizontalAxis ? stylePos->mWidth : stylePos->mHeight);
MOZ_ASSERT(!(aFlags & MIN_INTRINSIC_ISIZE) ||
styleISize.GetUnit() == eStyleUnit_Auto ||
styleISize.GetUnit() == eStyleUnit_Enumerated,
"should only use MIN_INTRINSIC_ISIZE for intrinsic values");
const nsStyleCoord& styleMaxISize =
horizontalAxis ? stylePos->mMaxWidth : stylePos->mMaxHeight;
// We build up two values starting with the content box, and then
// adding padding, border and margin. The result is normally
// |result|. Then, when we handle 'width', 'min-width', and
// 'max-width', we use the results we've been building in |min| as a
// minimum, overriding 'min-width'. This ensures two things:
// * that we don't let a value of 'box-sizing' specifying a width
// smaller than the padding/border inside the box-sizing box give
// a content width less than zero
// * that we prevent tables from becoming smaller than their
// intrinsic minimum width
nscoord result = 0, min = 0;
nscoord maxISize;
bool haveFixedMaxISize = GetAbsoluteCoord(styleMaxISize, maxISize);
nscoord minISize;
// Treat "min-width: auto" as 0.
bool haveFixedMinISize;
if (eStyleUnit_Auto == styleMinISize.GetUnit()) {
// NOTE: Technically, "auto" is supposed to behave like "min-content" on
// flex items. However, we don't need to worry about that here, because
// flex items' min-sizes are intentionally ignored until the flex
// container explicitly considers them during space distribution.
minISize = 0;
haveFixedMinISize = true;
} else {
haveFixedMinISize = GetAbsoluteCoord(styleMinISize, minISize);
}
PhysicalAxis ourInlineAxis =
aFrame->GetWritingMode().PhysicalAxis(eLogicalAxisInline);
const bool isInlineAxis = aAxis == ourInlineAxis;
// If we have a specified width (or a specified 'min-width' greater
// than the specified 'max-width', which works out to the same thing),
// don't even bother getting the frame's intrinsic width, because in
// this case GetAbsoluteCoord(styleISize, w) will always succeed, so
// we'll never need the intrinsic dimensions.
if (styleISize.GetUnit() == eStyleUnit_Enumerated &&
(styleISize.GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
styleISize.GetIntValue() == NS_STYLE_WIDTH_MIN_CONTENT)) {
// -moz-fit-content and -moz-available enumerated widths compute intrinsic
// widths just like auto.
// For -moz-max-content and -moz-min-content, we handle them like
// specified widths, but ignore box-sizing.
boxSizing = StyleBoxSizing::Content;
if (aMarginBoxMinSizeClamp != NS_MAXSIZE &&
styleISize.GetIntValue() == NS_STYLE_WIDTH_MIN_CONTENT) {
// We need |result| to be the 'min-content size' for the clamping below.
result = aFrame->GetMinISize(aRenderingContext);
}
} else if (!styleISize.ConvertsToLength() &&
!(haveFixedMinISize && haveFixedMaxISize && maxISize <= minISize)) {
#ifdef DEBUG_INTRINSIC_WIDTH
++gNoiseIndent;
#endif
if (aType != MIN_ISIZE) {
// At this point, |styleISize| is auto/-moz-fit-content/-moz-available or
// has a percentage. The intrinisic size for those under a max-content
// constraint is the max-content contribution which we shouldn't clamp.
aMarginBoxMinSizeClamp = NS_MAXSIZE;
}
if (MOZ_UNLIKELY(!isInlineAxis)) {
IntrinsicSize intrinsicSize = aFrame->GetIntrinsicSize();
const nsStyleCoord intrinsicBCoord =
horizontalAxis ? intrinsicSize.width : intrinsicSize.height;
if (intrinsicBCoord.GetUnit() == eStyleUnit_Coord) {
result = intrinsicBCoord.GetCoordValue();
} else {
// We don't have an intrinsic bsize and we need aFrame's block-dir size.
if (aFlags & BAIL_IF_REFLOW_NEEDED) {
return NS_INTRINSIC_WIDTH_UNKNOWN;
}
// XXX Unfortunately, we probably don't know this yet, so this is wrong...
// but it's not clear what we should do. If aFrame's inline size hasn't
// been determined yet, we can't necessarily figure out its block size
// either. For now, authors who put orthogonal elements into things like
// buttons or table cells may have to explicitly provide sizes rather
// than expecting intrinsic sizing to work "perfectly" in underspecified
// cases.
result = aFrame->BSize();
}
} else {
result = aType == MIN_ISIZE
? aFrame->GetMinISize(aRenderingContext)
: aFrame->GetPrefISize(aRenderingContext);
}
#ifdef DEBUG_INTRINSIC_WIDTH
--gNoiseIndent;
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s %s intrinsic size from frame is %d.\n",
aType == MIN_ISIZE ? "min" : "pref",
horizontalAxis ? "horizontal" : "vertical",
result);
#endif
// Handle elements with an intrinsic ratio (or size) and a specified
// height, min-height, or max-height.
// NOTE: We treat "min-height:auto" as "0" for the purpose of this code,
// since that's what it means in all cases except for on flex items -- and
// even there, we're supposed to ignore it (i.e. treat it as 0) until the
// flex container explicitly considers it.
const nsStyleCoord& styleBSize =
horizontalAxis ? stylePos->mHeight : stylePos->mWidth;
const nsStyleCoord& styleMinBSize =
horizontalAxis ? stylePos->mMinHeight : stylePos->mMinWidth;
const nsStyleCoord& styleMaxBSize =
horizontalAxis ? stylePos->mMaxHeight : stylePos->mMaxWidth;
if (styleBSize.GetUnit() != eStyleUnit_Auto ||
!(styleMinBSize.GetUnit() == eStyleUnit_Auto ||
(styleMinBSize.GetUnit() == eStyleUnit_Coord &&
styleMinBSize.GetCoordValue() == 0)) ||
styleMaxBSize.GetUnit() != eStyleUnit_None) {
nsSize ratio(aFrame->GetIntrinsicRatio());
nscoord ratioISize = (horizontalAxis ? ratio.width : ratio.height);
nscoord ratioBSize = (horizontalAxis ? ratio.height : ratio.width);
if (ratioBSize != 0) {
AddStateBitToAncestors(aFrame,
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE);
nscoord bSizeTakenByBoxSizing =
GetDefiniteSizeTakenByBoxSizing(boxSizing, aFrame, !isInlineAxis,
aFlags & IGNORE_PADDING,
aPercentageBasis);
// NOTE: This is only the minContentSize if we've been passed MIN_INTRINSIC_ISIZE
// (which is fine, because this should only be used inside a check for that flag).
nscoord minContentSize = result;
nscoord h;
if (GetDefiniteSize(styleBSize, aFrame, !isInlineAxis, aPercentageBasis, &h) ||
(aPercentageBasis.isNothing() &&
GetPercentBSize(styleBSize, aFrame, horizontalAxis, h))) {
h = std::max(0, h - bSizeTakenByBoxSizing);
result = NSCoordMulDiv(h, ratioISize, ratioBSize);
}
if (GetDefiniteSize(styleMaxBSize, aFrame, !isInlineAxis, aPercentageBasis, &h) ||
(aPercentageBasis.isNothing() &&
GetPercentBSize(styleMaxBSize, aFrame, horizontalAxis, h))) {
h = std::max(0, h - bSizeTakenByBoxSizing);
nscoord maxISize = NSCoordMulDiv(h, ratioISize, ratioBSize);
if (maxISize < result) {
result = maxISize;
}
if (maxISize < minContentSize) {
minContentSize = maxISize;
}
}
if (GetDefiniteSize(styleMinBSize, aFrame, !isInlineAxis, aPercentageBasis, &h) ||
(aPercentageBasis.isNothing() &&
GetPercentBSize(styleMinBSize, aFrame, horizontalAxis, h))) {
h = std::max(0, h - bSizeTakenByBoxSizing);
nscoord minISize = NSCoordMulDiv(h, ratioISize, ratioBSize);
if (minISize > result) {
result = minISize;
}
if (minISize > minContentSize) {
minContentSize = minISize;
}
}
if (MOZ_UNLIKELY(aFlags & nsLayoutUtils::MIN_INTRINSIC_ISIZE)) {
// This is the 'min-width/height:auto' "transferred size" piece of:
// https://www.w3.org/TR/css-flexbox-1/#min-width-automatic-minimum-size
// https://drafts.csswg.org/css-grid/#min-size-auto
result = std::min(result, minContentSize);
}
}
}
}
if (aFrame->IsTableFrame()) {
// Tables can't shrink smaller than their intrinsic minimum width,
// no matter what.
min = aFrame->GetMinISize(aRenderingContext);
}
nsIFrame::IntrinsicISizeOffsetData offsets =
MOZ_LIKELY(isInlineAxis) ? aFrame->IntrinsicISizeOffsets()
: aFrame->IntrinsicBSizeOffsets();
nscoord contentBoxSize = result;
result = AddIntrinsicSizeOffset(aRenderingContext, aFrame, offsets, aType,
boxSizing, result, min, styleISize,
haveFixedMinISize ? &minISize : nullptr,
styleMinISize,
haveFixedMaxISize ? &maxISize : nullptr,
styleMaxISize,
aFlags, aAxis);
nscoord overflow = result - aMarginBoxMinSizeClamp;
if (MOZ_UNLIKELY(overflow > 0)) {
nscoord newContentBoxSize = std::max(nscoord(0), contentBoxSize - overflow);
result -= contentBoxSize - newContentBoxSize;
}
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s %s intrinsic size for container is %d twips.\n",
aType == MIN_ISIZE ? "min" : "pref",
horizontalAxis ? "horizontal" : "vertical",
result);
#endif
return result;
}
/* static */ nscoord
nsLayoutUtils::IntrinsicForContainer(gfxContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicISizeType aType,
uint32_t aFlags)
{
MOZ_ASSERT(aFrame && aFrame->GetParent());
// We want the size aFrame will contribute to its parent's inline-size.
PhysicalAxis axis =
aFrame->GetParent()->GetWritingMode().PhysicalAxis(eLogicalAxisInline);
return IntrinsicForAxis(axis, aRenderingContext, aFrame, aType, Nothing(), aFlags);
}
/* static */ nscoord
nsLayoutUtils::MinSizeContributionForAxis(PhysicalAxis aAxis,
gfxContext* aRC,
nsIFrame* aFrame,
IntrinsicISizeType aType,
uint32_t aFlags)
{
MOZ_ASSERT(aFrame);
MOZ_ASSERT(aFrame->IsFlexOrGridItem(),
"only grid/flex items have this behavior currently");
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s min-isize for %s WM:\n",
aType == MIN_ISIZE ? "min" : "pref",
aWM.IsVertical() ? "vertical" : "horizontal");
#endif
// Note: this method is only meant for grid/flex items which always
// include percentages in their intrinsic size.
aFlags |= nsLayoutUtils::ADD_PERCENTS;
const nsStylePosition* const stylePos = aFrame->StylePosition();
const nsStyleCoord* style = aAxis == eAxisHorizontal ? &stylePos->mMinWidth
: &stylePos->mMinHeight;
nscoord minSize;
nscoord* fixedMinSize = nullptr;
auto minSizeUnit = style->GetUnit();
if (minSizeUnit == eStyleUnit_Auto) {
if (aFrame->StyleDisplay()->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE) {
style = aAxis == eAxisHorizontal ? &stylePos->mWidth
: &stylePos->mHeight;
if (GetAbsoluteCoord(*style, minSize)) {
// We have a definite width/height. This is the "specified size" in:
// https://drafts.csswg.org/css-grid/#min-size-auto
fixedMinSize = &minSize;
}
// fall through - the caller will have to deal with "transferred size"
} else {
// min-[width|height]:auto with overflow != visible computes to zero.
minSize = 0;
fixedMinSize = &minSize;
}
} else if (GetAbsoluteCoord(*style, minSize)) {
fixedMinSize = &minSize;
} else if (minSizeUnit != eStyleUnit_Enumerated) {
MOZ_ASSERT(style->HasPercent());
minSize = 0;
fixedMinSize = &minSize;
}
if (!fixedMinSize) {
// Let the caller deal with the "content size" cases.
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s min-isize is indefinite.\n",
aType == MIN_ISIZE ? "min" : "pref");
#endif
return NS_UNCONSTRAINEDSIZE;
}
// If aFrame is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(aFrame);
PhysicalAxis ourInlineAxis =
aFrame->GetWritingMode().PhysicalAxis(eLogicalAxisInline);
nsIFrame::IntrinsicISizeOffsetData offsets =
ourInlineAxis == aAxis ? aFrame->IntrinsicISizeOffsets()
: aFrame->IntrinsicBSizeOffsets();
nscoord result = 0;
nscoord min = 0;
const nsStyleCoord& maxISize =
aAxis == eAxisHorizontal ? stylePos->mMaxWidth : stylePos->mMaxHeight;
result = AddIntrinsicSizeOffset(aRC, aFrame, offsets, aType,
stylePos->mBoxSizing,
result, min, *style, fixedMinSize,
*style, nullptr, maxISize, aFlags, aAxis);
#ifdef DEBUG_INTRINSIC_WIDTH
nsFrame::IndentBy(stderr, gNoiseIndent);
static_cast<nsFrame*>(aFrame)->ListTag(stderr);
printf_stderr(" %s min-isize is %d twips.\n",
aType == MIN_ISIZE ? "min" : "pref", result);
#endif
return result;
}
/* static */ nscoord
nsLayoutUtils::ComputeCBDependentValue(nscoord aPercentBasis,
const nsStyleCoord& aCoord)
{
NS_WARNING_ASSERTION(
aPercentBasis != NS_UNCONSTRAINEDSIZE,
"have unconstrained width or height; this should only result from very "
"large sizes, not attempts at intrinsic size calculation");
if (aCoord.IsCoordPercentCalcUnit()) {
return aCoord.ComputeCoordPercentCalc(aPercentBasis);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected width value");
return 0;
}
/* static */ nscoord
nsLayoutUtils::ComputeBSizeDependentValue(
nscoord aContainingBlockBSize,
const nsStyleCoord& aCoord)
{
// XXXldb Some callers explicitly check aContainingBlockBSize
// against NS_AUTOHEIGHT *and* unit against eStyleUnit_Percent or
// calc()s containing percents before calling this function.
// However, it would be much more likely to catch problems without
// the unit conditions.
// XXXldb Many callers pass a non-'auto' containing block height when
// according to CSS2.1 they should be passing 'auto'.
NS_PRECONDITION(NS_AUTOHEIGHT != aContainingBlockBSize ||
!aCoord.HasPercent(),
"unexpected containing block block-size");
if (aCoord.IsCoordPercentCalcUnit()) {
return aCoord.ComputeCoordPercentCalc(aContainingBlockBSize);
}
NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
aCoord.GetUnit() == eStyleUnit_Auto,
"unexpected block-size value");
return 0;
}
/* static */ void
nsLayoutUtils::MarkDescendantsDirty(nsIFrame *aSubtreeRoot)
{
AutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aSubtreeRoot);
// dirty descendants, iterating over subtrees that may include
// additional subtrees associated with placeholders
do {
nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
subtrees.RemoveElementAt(subtrees.Length() - 1);
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that ReflowInput::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
f->MarkIntrinsicISizesDirty();
if (f->IsPlaceholderFrame()) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* kid = childFrames.get();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
} while (subtrees.Length() != 0);
}
/* static */
void
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(nsIFrame* aFrame)
{
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(aFrame);
do {
nsIFrame* f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
if (!f->HasAnyStateBits(
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
continue;
}
f->MarkIntrinsicISizesDirty();
for (nsIFrame::ChildListIterator lists(f); !lists.IsDone(); lists.Next()) {
for (nsIFrame* kid : lists.CurrentList()) {
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
nsSize
nsLayoutUtils::ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
nscoord maxWidth, nscoord maxHeight,
nscoord tentWidth, nscoord tentHeight)
{
// Now apply min/max-width/height - CSS 2.1 sections 10.4 and 10.7:
if (minWidth > maxWidth)
maxWidth = minWidth;
if (minHeight > maxHeight)
maxHeight = minHeight;
nscoord heightAtMaxWidth, heightAtMinWidth,
widthAtMaxHeight, widthAtMinHeight;
if (tentWidth > 0) {
heightAtMaxWidth = NSCoordMulDiv(maxWidth, tentHeight, tentWidth);
if (heightAtMaxWidth < minHeight)
heightAtMaxWidth = minHeight;
heightAtMinWidth = NSCoordMulDiv(minWidth, tentHeight, tentWidth);
if (heightAtMinWidth > maxHeight)
heightAtMinWidth = maxHeight;
} else {
heightAtMaxWidth = heightAtMinWidth = NS_CSS_MINMAX(tentHeight, minHeight, maxHeight);
}
if (tentHeight > 0) {
widthAtMaxHeight = NSCoordMulDiv(maxHeight, tentWidth, tentHeight);
if (widthAtMaxHeight < minWidth)
widthAtMaxHeight = minWidth;
widthAtMinHeight = NSCoordMulDiv(minHeight, tentWidth, tentHeight);
if (widthAtMinHeight > maxWidth)
widthAtMinHeight = maxWidth;
} else {
widthAtMaxHeight = widthAtMinHeight = NS_CSS_MINMAX(tentWidth, minWidth, maxWidth);
}
// The table at http://www.w3.org/TR/CSS21/visudet.html#min-max-widths :
nscoord width, height;
if (tentWidth > maxWidth) {
if (tentHeight > maxHeight) {
if (int64_t(maxWidth) * int64_t(tentHeight) <=
int64_t(maxHeight) * int64_t(tentWidth)) {
width = maxWidth;
height = heightAtMaxWidth;
} else {
width = widthAtMaxHeight;
height = maxHeight;
}
} else {
// This also covers "(w > max-width) and (h < min-height)" since in
// that case (max-width/w < 1), and with (h < min-height):
// max(max-width * h/w, min-height) == min-height
width = maxWidth;
height = heightAtMaxWidth;
}
} else if (tentWidth < minWidth) {
if (tentHeight < minHeight) {
if (int64_t(minWidth) * int64_t(tentHeight) <=
int64_t(minHeight) * int64_t(tentWidth)) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = minWidth;
height = heightAtMinWidth;
}
} else {
// This also covers "(w < min-width) and (h > max-height)" since in
// that case (min-width/w > 1), and with (h > max-height):
// min(min-width * h/w, max-height) == max-height
width = minWidth;
height = heightAtMinWidth;
}
} else {
if (tentHeight > maxHeight) {
width = widthAtMaxHeight;
height = maxHeight;
} else if (tentHeight < minHeight) {
width = widthAtMinHeight;
height = minHeight;
} else {
width = tentWidth;
height = tentHeight;
}
}
return nsSize(width, height);
}
/* static */ nscoord
nsLayoutUtils::MinISizeFromInline(nsIFrame* aFrame,
gfxContext* aRenderingContext)
{
NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
"should not be container for font size inflation");
nsIFrame::InlineMinISizeData data;
DISPLAY_MIN_WIDTH(aFrame, data.mPrevLines);
aFrame->AddInlineMinISize(aRenderingContext, &data);
data.ForceBreak();
return data.mPrevLines;
}
/* static */ nscoord
nsLayoutUtils::PrefISizeFromInline(nsIFrame* aFrame,
gfxContext* aRenderingContext)
{
NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
"should not be container for font size inflation");
nsIFrame::InlinePrefISizeData data;
DISPLAY_PREF_WIDTH(aFrame, data.mPrevLines);
aFrame->AddInlinePrefISize(aRenderingContext, &data);
data.ForceBreak();
return data.mPrevLines;
}
static nscolor
DarkenColor(nscolor aColor)
{
uint16_t hue, sat, value;
uint8_t alpha;
// convert the RBG to HSV so we can get the lightness (which is the v)
NS_RGB2HSV(aColor, hue, sat, value, alpha);
// The goal here is to send white to black while letting colored
// stuff stay colored... So we adopt the following approach.
// Something with sat = 0 should end up with value = 0. Something
// with a high sat can end up with a high value and it's ok.... At
// the same time, we don't want to make things lighter. Do
// something simple, since it seems to work.
if (value > sat) {
value = sat;
// convert this color back into the RGB color space.
NS_HSV2RGB(aColor, hue, sat, value, alpha);
}
return aColor;
}
// Check whether we should darken text/decoration colors. We need to do this if
// background images and colors are being suppressed, because that means
// light text will not be visible against the (presumed light-colored) background.
static bool
ShouldDarkenColors(nsPresContext* aPresContext)
{
return !aPresContext->GetBackgroundColorDraw() &&
!aPresContext->GetBackgroundImageDraw();
}
nscolor
nsLayoutUtils::DarkenColorIfNeeded(nsIFrame* aFrame, nscolor aColor)
{
if (ShouldDarkenColors(aFrame->PresContext())) {
return DarkenColor(aColor);
}
return aColor;
}
gfxFloat
nsLayoutUtils::GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
nscoord aY, nscoord aAscent)
{
gfxFloat appUnitsPerDevUnit = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxFloat baseline = gfxFloat(aY) + aAscent;
gfxRect putativeRect(0, baseline/appUnitsPerDevUnit, 1, 1);
if (!aContext->UserToDevicePixelSnapped(putativeRect, true))
return baseline;
return aContext->DeviceToUser(putativeRect.TopLeft()).y * appUnitsPerDevUnit;
}
gfxFloat
nsLayoutUtils::GetSnappedBaselineX(nsIFrame* aFrame, gfxContext* aContext,
nscoord aX, nscoord aAscent)
{
gfxFloat appUnitsPerDevUnit = aFrame->PresContext()->AppUnitsPerDevPixel();
gfxFloat baseline = gfxFloat(aX) + aAscent;
gfxRect putativeRect(baseline / appUnitsPerDevUnit, 0, 1, 1);
if (!aContext->UserToDevicePixelSnapped(putativeRect, true)) {
return baseline;
}
return aContext->DeviceToUser(putativeRect.TopLeft()).x * appUnitsPerDevUnit;
}
// Hard limit substring lengths to 8000 characters ... this lets us statically
// size the cluster buffer array in FindSafeLength
#define MAX_GFX_TEXT_BUF_SIZE 8000
static int32_t FindSafeLength(const char16_t *aString, uint32_t aLength,
uint32_t aMaxChunkLength)
{
if (aLength <= aMaxChunkLength)
return aLength;
int32_t len = aMaxChunkLength;
// Ensure that we don't break inside a surrogate pair
while (len > 0 && NS_IS_LOW_SURROGATE(aString[len])) {
len--;
}
if (len == 0) {
// We don't want our caller to go into an infinite loop, so don't
// return zero. It's hard to imagine how we could actually get here
// unless there are languages that allow clusters of arbitrary size.
// If there are and someone feeds us a 500+ character cluster, too
// bad.
return aMaxChunkLength;
}
return len;
}
static int32_t GetMaxChunkLength(nsFontMetrics& aFontMetrics)
{
return std::min(aFontMetrics.GetMaxStringLength(), MAX_GFX_TEXT_BUF_SIZE);
}
nscoord
nsLayoutUtils::AppUnitWidthOfString(const char16_t *aString,
uint32_t aLength,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget)
{
uint32_t maxChunkLength = GetMaxChunkLength(aFontMetrics);
nscoord width = 0;
while (aLength > 0) {
int32_t len = FindSafeLength(aString, aLength, maxChunkLength);
width += aFontMetrics.GetWidth(aString, len, aDrawTarget);
aLength -= len;
aString += len;
}
return width;
}
nscoord
nsLayoutUtils::AppUnitWidthOfStringBidi(const char16_t* aString,
uint32_t aLength,
const nsIFrame* aFrame,
nsFontMetrics& aFontMetrics,
gfxContext& aContext)
{
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiLevel level =
nsBidiPresUtils::BidiLevelFromStyle(aFrame->StyleContext());
return nsBidiPresUtils::MeasureTextWidth(aString, aLength, level,
presContext, aContext,
aFontMetrics);
}
aFontMetrics.SetTextRunRTL(false);
aFontMetrics.SetVertical(aFrame->GetWritingMode().IsVertical());
aFontMetrics.SetTextOrientation(aFrame->StyleVisibility()->mTextOrientation);
return nsLayoutUtils::AppUnitWidthOfString(aString, aLength, aFontMetrics,
aContext.GetDrawTarget());
}
bool
nsLayoutUtils::StringWidthIsGreaterThan(const nsString& aString,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget,
nscoord aWidth)
{
const char16_t *string = aString.get();
uint32_t length = aString.Length();
uint32_t maxChunkLength = GetMaxChunkLength(aFontMetrics);
nscoord width = 0;
while (length > 0) {
int32_t len = FindSafeLength(string, length, maxChunkLength);
width += aFontMetrics.GetWidth(string, len, aDrawTarget);
if (width > aWidth) {
return true;
}
length -= len;
string += len;
}
return false;
}
nsBoundingMetrics
nsLayoutUtils::AppUnitBoundsOfString(const char16_t* aString,
uint32_t aLength,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget)
{
uint32_t maxChunkLength = GetMaxChunkLength(aFontMetrics);
int32_t len = FindSafeLength(aString, aLength, maxChunkLength);
// Assign directly in the first iteration. This ensures that
// negative ascent/descent can be returned and the left bearing
// is properly initialized.
nsBoundingMetrics totalMetrics =
aFontMetrics.GetBoundingMetrics(aString, len, aDrawTarget);
aLength -= len;
aString += len;
while (aLength > 0) {
len = FindSafeLength(aString, aLength, maxChunkLength);
nsBoundingMetrics metrics =
aFontMetrics.GetBoundingMetrics(aString, len, aDrawTarget);
totalMetrics += metrics;
aLength -= len;
aString += len;
}
return totalMetrics;
}
void
nsLayoutUtils::DrawString(const nsIFrame* aFrame,
nsFontMetrics& aFontMetrics,
gfxContext* aContext,
const char16_t* aString,
int32_t aLength,
nsPoint aPoint,
nsStyleContext* aStyleContext,
DrawStringFlags aFlags)
{
nsresult rv = NS_ERROR_FAILURE;
// If caller didn't pass a style context, use the frame's.
if (!aStyleContext) {
aStyleContext = aFrame->StyleContext();
}
if (aFlags & DrawStringFlags::eForceHorizontal) {
aFontMetrics.SetVertical(false);
} else {
aFontMetrics.SetVertical(WritingMode(aStyleContext).IsVertical());
}
aFontMetrics.SetTextOrientation(
aStyleContext->StyleVisibility()->mTextOrientation);
nsPresContext* presContext = aFrame->PresContext();
if (presContext->BidiEnabled()) {
nsBidiLevel level =
nsBidiPresUtils::BidiLevelFromStyle(aStyleContext);
rv = nsBidiPresUtils::RenderText(aString, aLength, level,
presContext, *aContext,
aContext->GetDrawTarget(), aFontMetrics,
aPoint.x, aPoint.y);
}
if (NS_FAILED(rv))
{
aFontMetrics.SetTextRunRTL(false);
DrawUniDirString(aString, aLength, aPoint, aFontMetrics, *aContext);
}
}
void
nsLayoutUtils::DrawUniDirString(const char16_t* aString,
uint32_t aLength,
const nsPoint& aPoint,
nsFontMetrics& aFontMetrics,
gfxContext& aContext)
{
nscoord x = aPoint.x;
nscoord y = aPoint.y;
uint32_t maxChunkLength = GetMaxChunkLength(aFontMetrics);
if (aLength <= maxChunkLength) {
aFontMetrics.DrawString(aString, aLength, x, y, &aContext,
aContext.GetDrawTarget());
return;
}
bool isRTL = aFontMetrics.GetTextRunRTL();
// If we're drawing right to left, we must start at the end.
if (isRTL) {
x += nsLayoutUtils::AppUnitWidthOfString(aString, aLength, aFontMetrics,
aContext.GetDrawTarget());
}
while (aLength > 0) {
int32_t len = FindSafeLength(aString, aLength, maxChunkLength);
nscoord width = aFontMetrics.GetWidth(aString, len, aContext.GetDrawTarget());
if (isRTL) {
x -= width;
}
aFontMetrics.DrawString(aString, len, x, y, &aContext,
aContext.GetDrawTarget());
if (!isRTL) {
x += width;
}
aLength -= len;
aString += len;
}
}
/* static */ void
nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
gfxContext* aContext,
const nsRect& aTextRect,
const nsRect& aDirtyRect,
const nscolor& aForegroundColor,
TextShadowCallback aCallback,
void* aCallbackData)
{
const nsStyleText* textStyle = aFrame->StyleText();
if (!textStyle->HasTextShadow())
return;
// Text shadow happens with the last value being painted at the back,
// ie. it is painted first.
gfxContext* aDestCtx = aContext;
for (uint32_t i = textStyle->mTextShadow->Length(); i > 0; --i) {
nsCSSShadowItem* shadowDetails = textStyle->mTextShadow->ShadowAt(i - 1);
nsPoint shadowOffset(shadowDetails->mXOffset,
shadowDetails->mYOffset);
nscoord blurRadius = std::max(shadowDetails->mRadius, 0);
nsRect shadowRect(aTextRect);
shadowRect.MoveBy(shadowOffset);
nsPresContext* presCtx = aFrame->PresContext();
nsContextBoxBlur contextBoxBlur;
nscolor shadowColor;
if (shadowDetails->mHasColor)
shadowColor = shadowDetails->mColor;
else
shadowColor = aForegroundColor;
// Webrender just needs the shadow details
if (auto* textDrawer = aContext->GetTextDrawer()) {
wr::Shadow wrShadow;
wrShadow.offset = {
presCtx->AppUnitsToFloatDevPixels(shadowDetails->mXOffset),
presCtx->AppUnitsToFloatDevPixels(shadowDetails->mYOffset)
};
wrShadow.blur_radius = presCtx->AppUnitsToFloatDevPixels(shadowDetails->mRadius);
wrShadow.color = wr::ToColorF(ToDeviceColor(shadowColor));
textDrawer->AppendShadow(wrShadow);
return;
}
gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, 0, blurRadius,
presCtx->AppUnitsPerDevPixel(),
aDestCtx, aDirtyRect, nullptr,
nsContextBoxBlur::DISABLE_HARDWARE_ACCELERATION_BLUR);
if (!shadowContext)
continue;
aDestCtx->Save();
aDestCtx->NewPath();
aDestCtx->SetColor(Color::FromABGR(shadowColor));
// The callback will draw whatever we want to blur as a shadow.
aCallback(shadowContext, shadowOffset, shadowColor, aCallbackData);
contextBoxBlur.DoPaint();
aDestCtx->Restore();
}
}
/* static */ nscoord
nsLayoutUtils::GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight,
bool aIsInverted)
{
nscoord fontAscent = aIsInverted ? aFontMetrics->MaxDescent()
: aFontMetrics->MaxAscent();
nscoord fontHeight = aFontMetrics->MaxHeight();
nscoord leading = aLineHeight - fontHeight;
return fontAscent + leading/2;
}
/* static */ bool
nsLayoutUtils::GetFirstLineBaseline(WritingMode aWritingMode,
const nsIFrame* aFrame, nscoord* aResult)
{
LinePosition position;
if (!GetFirstLinePosition(aWritingMode, aFrame, &position))
return false;
*aResult = position.mBaseline;
return true;
}
/* static */ bool
nsLayoutUtils::GetFirstLinePosition(WritingMode aWM,
const nsIFrame* aFrame,
LinePosition* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block) {
// For the first-line baseline we also have to check for a table, and if
// so, use the baseline of its first row.
LayoutFrameType fType = aFrame->Type();
if (fType == LayoutFrameType::TableWrapper ||
fType == LayoutFrameType::FlexContainer ||
fType == LayoutFrameType::GridContainer) {
if ((fType == LayoutFrameType::GridContainer &&
aFrame->HasAnyStateBits(NS_STATE_GRID_SYNTHESIZE_BASELINE)) ||
(fType == LayoutFrameType::FlexContainer &&
aFrame->HasAnyStateBits(NS_STATE_FLEX_SYNTHESIZE_BASELINE)) ||
(fType == LayoutFrameType::TableWrapper &&
static_cast<const nsTableWrapperFrame*>(aFrame)->GetRowCount() == 0)) {
// empty grid/flex/table container
aResult->mBStart = 0;
aResult->mBaseline = aFrame->SynthesizeBaselineBOffsetFromBorderBox(aWM,
BaselineSharingGroup::eFirst);
aResult->mBEnd = aFrame->BSize(aWM);
return true;
}
aResult->mBStart = 0;
aResult->mBaseline = aFrame->GetLogicalBaseline(aWM);
// This is what we want for the list bullet caller; not sure if
// other future callers will want the same.
aResult->mBEnd = aFrame->BSize(aWM);
return true;
}
// For first-line baselines, we have to consider scroll frames.
if (fType == LayoutFrameType::Scroll) {
nsIScrollableFrame *sFrame = do_QueryFrame(const_cast<nsIFrame*>(aFrame));
if (!sFrame) {
NS_NOTREACHED("not scroll frame");
}
LinePosition kidPosition;
if (GetFirstLinePosition(aWM,
sFrame->GetScrolledFrame(), &kidPosition)) {
// Consider only the border and padding that contributes to the
// kid's position, not the scrolling, so we get the initial
// position.
*aResult = kidPosition +
aFrame->GetLogicalUsedBorderAndPadding(aWM).BStart(aWM);
return true;
}
return false;
}
if (fType == LayoutFrameType::FieldSet) {
LinePosition kidPosition;
nsIFrame* kid = aFrame->PrincipalChildList().FirstChild();
// kid might be a legend frame here, but that's ok.
if (GetFirstLinePosition(aWM, kid, &kidPosition)) {
*aResult = kidPosition +
kid->GetLogicalNormalPosition(aWM, aFrame->GetSize()).B(aWM);
return true;
}
return false;
}
// No baseline.
return false;
}
for (nsBlockFrame::ConstLineIterator line = block->LinesBegin(),
line_end = block->LinesEnd();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
LinePosition kidPosition;
if (GetFirstLinePosition(aWM, kid, &kidPosition)) {
//XXX Not sure if this is the correct value to use for container
// width here. It will only be used in vertical-rl layout,
// which we don't have full support and testing for yet.
const nsSize& containerSize = line->mContainerSize;
*aResult = kidPosition +
kid->GetLogicalNormalPosition(aWM, containerSize).B(aWM);
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->BSize() != 0 || !line->IsEmpty()) {
nscoord bStart = line->BStart();
aResult->mBStart = bStart;
aResult->mBaseline = bStart + line->GetLogicalAscent();
aResult->mBEnd = bStart + line->BSize();
return true;
}
}
}
return false;
}
/* static */ bool
nsLayoutUtils::GetLastLineBaseline(WritingMode aWM,
const nsIFrame* aFrame, nscoord* aResult)
{
const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
if (!block)
// No baseline. (We intentionally don't descend into scroll frames.)
return false;
for (nsBlockFrame::ConstReverseLineIterator line = block->LinesRBegin(),
line_end = block->LinesREnd();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame *kid = line->mFirstChild;
nscoord kidBaseline;
const nsSize& containerSize = line->mContainerSize;
if (GetLastLineBaseline(aWM, kid, &kidBaseline)) {
// Ignore relative positioning for baseline calculations
*aResult = kidBaseline +
kid->GetLogicalNormalPosition(aWM, containerSize).B(aWM);
return true;
} else if (kid->IsScrollFrame()) {
// Defer to nsFrame::GetLogicalBaseline (which synthesizes a baseline
// from the margin-box).
kidBaseline = kid->GetLogicalBaseline(aWM);
*aResult = kidBaseline +
kid->GetLogicalNormalPosition(aWM, containerSize).B(aWM);
return true;
}
} else {
// XXX Is this the right test? We have some bogus empty lines
// floating around, but IsEmpty is perhaps too weak.
if (line->BSize() != 0 || !line->IsEmpty()) {
*aResult = line->BStart() + line->GetLogicalAscent();
return true;
}
}
}
return false;
}
static nscoord
CalculateBlockContentBEnd(WritingMode aWM, nsBlockFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBEnd = 0;
for (nsBlockFrame::LineIterator line = aFrame->LinesBegin(),
line_end = aFrame->LinesEnd();
line != line_end; ++line) {
if (line->IsBlock()) {
nsIFrame* child = line->mFirstChild;
const nsSize& containerSize = line->mContainerSize;
nscoord offset =
child->GetLogicalNormalPosition(aWM, containerSize).B(aWM);
contentBEnd =
std::max(contentBEnd,
nsLayoutUtils::CalculateContentBEnd(aWM, child) + offset);
}
else {
contentBEnd = std::max(contentBEnd, line->BEnd());
}
}
return contentBEnd;
}
/* static */ nscoord
nsLayoutUtils::CalculateContentBEnd(WritingMode aWM, nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "null ptr");
nscoord contentBEnd = aFrame->BSize(aWM);
// We want scrollable overflow rather than visual because this
// calculation is intended to affect layout.
LogicalSize overflowSize(aWM, aFrame->GetScrollableOverflowRect().Size());
if (overflowSize.BSize(aWM) > contentBEnd) {
nsIFrame::ChildListIDs skip(nsIFrame::kOverflowList |
nsIFrame::kExcessOverflowContainersList |
nsIFrame::kOverflowOutOfFlowList);
nsBlockFrame* blockFrame = GetAsBlock(aFrame);
if (blockFrame) {
contentBEnd =
std::max(contentBEnd, CalculateBlockContentBEnd(aWM, blockFrame));
skip |= nsIFrame::kPrincipalList;
}
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
if (!skip.Contains(lists.CurrentID())) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
nscoord offset =
child->GetLogicalNormalPosition(aWM,
aFrame->GetSize()).B(aWM);
contentBEnd = std::max(contentBEnd,
CalculateContentBEnd(aWM, child) + offset);
}
}
}
}
return contentBEnd;
}
/* static */ nsIFrame*
nsLayoutUtils::GetClosestLayer(nsIFrame* aFrame)
{
nsIFrame* layer;
for (layer = aFrame; layer; layer = layer->GetParent()) {
if (layer->IsAbsPosContainingBlock() ||
(layer->GetParent() && layer->GetParent()->IsScrollFrame()))
break;
}
if (layer)
return layer;
return aFrame->PresShell()->FrameManager()->GetRootFrame();
}
SamplingFilter
nsLayoutUtils::GetSamplingFilterForFrame(nsIFrame* aForFrame)
{
SamplingFilter defaultFilter = SamplingFilter::GOOD;
nsStyleContext *sc;
if (nsCSSRendering::IsCanvasFrame(aForFrame)) {
nsCSSRendering::FindBackground(aForFrame, &sc);
} else {
sc = aForFrame->StyleContext();
}
switch (sc->StyleVisibility()->mImageRendering) {
case NS_STYLE_IMAGE_RENDERING_OPTIMIZESPEED:
return SamplingFilter::POINT;
case NS_STYLE_IMAGE_RENDERING_OPTIMIZEQUALITY:
return SamplingFilter::LINEAR;
case NS_STYLE_IMAGE_RENDERING_CRISPEDGES:
return SamplingFilter::POINT;
default:
return defaultFilter;
}
}
/**
* Given an image being drawn into an appunit coordinate system, and
* a point in that coordinate system, map the point back into image
* pixel space.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in the same coordinate system as the rectangle
*/
static gfxPoint
MapToFloatImagePixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(((aPt.x - aDest.X())*aSize.width)/aDest.Width(),
((aPt.y - aDest.Y())*aSize.height)/aDest.Height());
}
/**
* Given an image being drawn into an pixel-based coordinate system, and
* a point in image space, map the point into the pixel-based coordinate
* system.
* @param aSize the size of the image, in pixels
* @param aDest the rectangle that the image is being mapped into
* @param aPt a point in image space
*/
static gfxPoint
MapToFloatUserPixels(const gfxSize& aSize,
const gfxRect& aDest, const gfxPoint& aPt)
{
return gfxPoint(aPt.x*aDest.Width()/aSize.width + aDest.X(),
aPt.y*aDest.Height()/aSize.height + aDest.Y());
}
/* static */ gfxRect
nsLayoutUtils::RectToGfxRect(const nsRect& aRect, int32_t aAppUnitsPerDevPixel)
{
return gfxRect(gfxFloat(aRect.x) / aAppUnitsPerDevPixel,
gfxFloat(aRect.y) / aAppUnitsPerDevPixel,
gfxFloat(aRect.width) / aAppUnitsPerDevPixel,
gfxFloat(aRect.height) / aAppUnitsPerDevPixel);
}
struct SnappedImageDrawingParameters {
// A transform from image space to device space.
gfxMatrix imageSpaceToDeviceSpace;
// The size at which the image should be drawn (which may not be its
// intrinsic size due to, for example, HQ scaling).
nsIntSize size;
// The region in tiled image space which will be drawn, with an associated
// region to which sampling should be restricted.
ImageRegion region;
// The default viewport size for SVG images, which we use unless a different
// one has been explicitly specified. This is the same as |size| except that
// it does not take into account any transformation on the gfxContext we're
// drawing to - for example, CSS transforms are not taken into account.
CSSIntSize svgViewportSize;
// Whether there's anything to draw at all.
bool shouldDraw;
SnappedImageDrawingParameters()
: region(ImageRegion::Empty())
, shouldDraw(false)
{}
SnappedImageDrawingParameters(const gfxMatrix& aImageSpaceToDeviceSpace,
const nsIntSize& aSize,
const ImageRegion& aRegion,
const CSSIntSize& aSVGViewportSize)
: imageSpaceToDeviceSpace(aImageSpaceToDeviceSpace)
, size(aSize)
, region(aRegion)
, svgViewportSize(aSVGViewportSize)
, shouldDraw(true)
{}
};
/**
* Given two axis-aligned rectangles, returns the transformation that maps the
* first onto the second.
*
* @param aFrom The rect to be transformed.
* @param aTo The rect that aFrom should be mapped onto by the transformation.
*/
static gfxMatrix
TransformBetweenRects(const gfxRect& aFrom, const gfxRect& aTo)
{
gfxSize scale(aTo.width / aFrom.width,
aTo.height / aFrom.height);
gfxPoint translation(aTo.x - aFrom.x * scale.width,
aTo.y - aFrom.y * scale.height);
return gfxMatrix(scale.width, 0, 0, scale.height,
translation.x, translation.y);
}
static nsRect
TileNearRect(const nsRect& aAnyTile, const nsRect& aTargetRect)
{
nsPoint distance = aTargetRect.TopLeft() - aAnyTile.TopLeft();
return aAnyTile + nsPoint(distance.x / aAnyTile.width * aAnyTile.width,
distance.y / aAnyTile.height * aAnyTile.height);
}
static gfxFloat
StableRound(gfxFloat aValue)
{
// Values slightly less than 0.5 should round up like 0.5 would; we're
// assuming they were meant to be 0.5.
return floor(aValue + 0.5001);
}
static gfxPoint
StableRound(const gfxPoint& aPoint)
{
return gfxPoint(StableRound(aPoint.x), StableRound(aPoint.y));
}
/**
* Given a set of input parameters, compute certain output parameters
* for drawing an image with the image snapping algorithm.
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
*
* @see nsLayoutUtils::DrawImage() for the descriptions of input parameters
*/
static SnappedImageDrawingParameters
ComputeSnappedImageDrawingParameters(gfxContext* aCtx,
int32_t aAppUnitsPerDevPixel,
const nsRect aDest,
const nsRect aFill,
const nsPoint aAnchor,
const nsRect aDirty,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
uint32_t aImageFlags,
ExtendMode aExtendMode)
{
if (aDest.IsEmpty() || aFill.IsEmpty())
return SnappedImageDrawingParameters();
// Avoid unnecessarily large offsets.
bool doTile = !aDest.Contains(aFill);
nsRect appUnitDest = doTile ? TileNearRect(aDest, aFill.Intersect(aDirty))
: aDest;
nsPoint anchor = aAnchor + (appUnitDest.TopLeft() - aDest.TopLeft());
gfxRect devPixelDest =
nsLayoutUtils::RectToGfxRect(appUnitDest, aAppUnitsPerDevPixel);
gfxRect devPixelFill =
nsLayoutUtils::RectToGfxRect(aFill, aAppUnitsPerDevPixel);
gfxRect devPixelDirty =
nsLayoutUtils::RectToGfxRect(aDirty, aAppUnitsPerDevPixel);
gfxMatrix currentMatrix = aCtx->CurrentMatrixDouble();
gfxRect fill = devPixelFill;
gfxRect dest = devPixelDest;
bool didSnap;
// Snap even if we have a scale in the context. But don't snap if
// we have something that's not translation+scale, or if the scale flips in
// the X or Y direction, because snapped image drawing can't handle that yet.
// Any changes to this algorithm will need to be reflected in
// ComputeImageContainerDrawingParameters.
if (!currentMatrix.HasNonAxisAlignedTransform() &&
currentMatrix._11 > 0.0 && currentMatrix._22 > 0.0 &&
aCtx->UserToDevicePixelSnapped(fill, true) &&
aCtx->UserToDevicePixelSnapped(dest, true)) {
// We snapped. On this code path, |fill| and |dest| take into account
// currentMatrix's transform.
didSnap = true;
} else {
// We didn't snap. On this code path, |fill| and |dest| do not take into
// account currentMatrix's transform.
didSnap = false;
fill = devPixelFill;
dest = devPixelDest;
}
// If we snapped above, |dest| already takes into account |currentMatrix|'s scale
// and has integer coordinates. If not, we need these properties to compute
// the optimal drawn image size, so compute |snappedDestSize| here.
gfxSize snappedDestSize = dest.Size();
gfxSize scaleFactors = currentMatrix.ScaleFactors(true);
if (!didSnap) {
snappedDestSize.Scale(scaleFactors.width, scaleFactors.height);
snappedDestSize.width = NS_round(snappedDestSize.width);
snappedDestSize.height = NS_round(snappedDestSize.height);
}
// We need to be sure that this is at least one pixel in width and height,
// or we'll end up drawing nothing even if we have a nonempty fill.
snappedDestSize.width = std::max(snappedDestSize.width, 1.0);
snappedDestSize.height = std::max(snappedDestSize.height, 1.0);
// Bail if we're not going to end up drawing anything.
if (fill.IsEmpty()) {
return SnappedImageDrawingParameters();
}
nsIntSize intImageSize =
aImage->OptimalImageSizeForDest(snappedDestSize,
imgIContainer::FRAME_CURRENT,
aSamplingFilter, aImageFlags);
nsIntSize svgViewportSize;
if (scaleFactors.width == 1.0 && scaleFactors.height == 1.0) {
// intImageSize is scaled by currentMatrix. But since there are no scale
// factors in currentMatrix, it is safe to assign intImageSize to
// svgViewportSize directly.
svgViewportSize = intImageSize;
} else {
// We should not take into account any transformation of currentMatrix
// when computing svg viewport size. Since currentMatrix contains scale
// factors, we need to recompute SVG viewport by unscaled devPixelDest.
svgViewportSize = aImage->OptimalImageSizeForDest(devPixelDest.Size(),
imgIContainer::FRAME_CURRENT,
aSamplingFilter,
aImageFlags);
}
gfxSize imageSize(intImageSize.width, intImageSize.height);
// Compute the set of pixels that would be sampled by an ideal rendering
gfxPoint subimageTopLeft =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.TopLeft());
gfxPoint subimageBottomRight =
MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.BottomRight());
gfxRect subimage;
subimage.MoveTo(NSToIntFloor(subimageTopLeft.x),
NSToIntFloor(subimageTopLeft.y));
subimage.SizeTo(NSToIntCeil(subimageBottomRight.x) - subimage.x,
NSToIntCeil(subimageBottomRight.y) - subimage.y);
if (subimage.IsEmpty()) {
// Bail if the subimage is empty (we're not going to be drawing anything).
return SnappedImageDrawingParameters();
}
gfxMatrix transform;
gfxMatrix invTransform;
bool anchorAtUpperLeft = anchor.x == appUnitDest.x &&
anchor.y == appUnitDest.y;
bool exactlyOneImageCopy = aFill.IsEqualEdges(appUnitDest);
if (anchorAtUpperLeft && exactlyOneImageCopy) {
// The simple case: we can ignore the anchor point and compute the
// transformation from the sampled region (the subimage) to the fill rect.
// This approach is preferable when it works since it tends to produce
// less numerical error.
transform = TransformBetweenRects(subimage, fill);
invTransform = TransformBetweenRects(fill, subimage);
} else {
// The more complicated case: we compute the transformation from the
// image rect positioned at the image space anchor point to the dest rect
// positioned at the device space anchor point.
// Compute the anchor point in both device space and image space. This
// code assumes that pixel-based devices have one pixel per device unit!
gfxPoint anchorPoint(gfxFloat(anchor.x)/aAppUnitsPerDevPixel,
gfxFloat(anchor.y)/aAppUnitsPerDevPixel);
gfxPoint imageSpaceAnchorPoint =
MapToFloatImagePixels(imageSize, devPixelDest, anchorPoint);
if (didSnap) {
imageSpaceAnchorPoint = StableRound(imageSpaceAnchorPoint);
anchorPoint = imageSpaceAnchorPoint;
anchorPoint = MapToFloatUserPixels(imageSize, devPixelDest, anchorPoint);
anchorPoint = currentMatrix.TransformPoint(anchorPoint);
anchorPoint = StableRound(anchorPoint);
}
// Compute an unsnapped version of the dest rect's size. We continue to
// follow the pattern that we take |currentMatrix| into account only if
// |didSnap| is true.
gfxSize unsnappedDestSize
= didSnap ? devPixelDest.Size() * currentMatrix.ScaleFactors(true)
: devPixelDest.Size();
gfxRect anchoredDestRect(anchorPoint, unsnappedDestSize);
gfxRect anchoredImageRect(imageSpaceAnchorPoint, imageSize);
// Calculate anchoredDestRect with snapped fill rect when the devPixelFill rect
// corresponds to just a single tile in that direction
if (fill.Width() != devPixelFill.Width() &&
devPixelDest.x == devPixelFill.x &&
devPixelDest.XMost() == devPixelFill.XMost()) {
anchoredDestRect.width = fill.width;
}
if (fill.Height() != devPixelFill.Height() &&
devPixelDest.y == devPixelFill.y &&
devPixelDest.YMost() == devPixelFill.YMost()) {
anchoredDestRect.height = fill.height;
}
transform = TransformBetweenRects(anchoredImageRect, anchoredDestRect);
invTransform = TransformBetweenRects(anchoredDestRect, anchoredImageRect);
}
// If the transform is not a straight translation by integers, then
// filtering will occur, and restricting the fill rect to the dirty rect
// would change the values computed for edge pixels, which we can't allow.
// Also, if 'didSnap' is false then rounding out 'devPixelDirty' might not
// produce pixel-aligned coordinates, which would also break the values
// computed for edge pixels.
if (didSnap && !invTransform.HasNonIntegerTranslation()) {
// This form of Transform is safe to call since non-axis-aligned
// transforms wouldn't be snapped.
devPixelDirty = currentMatrix.TransformRect(devPixelDirty);
devPixelDirty.RoundOut();
fill = fill.Intersect(devPixelDirty);
}
if (fill.IsEmpty())
return SnappedImageDrawingParameters();
gfxRect imageSpaceFill(didSnap ? invTransform.TransformRect(fill)
: invTransform.TransformBounds(fill));
// If we didn't snap, we need to post-multiply the matrix on the context to
// get the final matrix we'll draw with, because we didn't take it into
// account when computing the matrices above.
if (!didSnap) {
transform = transform * currentMatrix;
}
ExtendMode extendMode = (aImageFlags & imgIContainer::FLAG_CLAMP)
? ExtendMode::CLAMP
: aExtendMode;
// We were passed in the default extend mode but need to tile.
if (extendMode == ExtendMode::CLAMP && doTile) {
MOZ_ASSERT(!(aImageFlags & imgIContainer::FLAG_CLAMP));
extendMode = ExtendMode::REPEAT;
}
ImageRegion region =
ImageRegion::CreateWithSamplingRestriction(imageSpaceFill, subimage, extendMode);
return SnappedImageDrawingParameters(transform, intImageSize,
region,
CSSIntSize(svgViewportSize.width,
svgViewportSize.height));
}
static ImgDrawResult
DrawImageInternal(gfxContext& aContext,
nsPresContext* aPresContext,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aImageFlags,
ExtendMode aExtendMode = ExtendMode::CLAMP,
float aOpacity = 1.0)
{
ImgDrawResult result = ImgDrawResult::SUCCESS;
aImageFlags |= imgIContainer::FLAG_ASYNC_NOTIFY;
if (aPresContext->Type() == nsPresContext::eContext_Print) {
// We want vector images to be passed on as vector commands, not a raster
// image.
aImageFlags |= imgIContainer::FLAG_BYPASS_SURFACE_CACHE;
}
if (aDest.Contains(aFill)) {
aImageFlags |= imgIContainer::FLAG_CLAMP;
}
int32_t appUnitsPerDevPixel =
aPresContext->AppUnitsPerDevPixel();
SnappedImageDrawingParameters params =
ComputeSnappedImageDrawingParameters(&aContext, appUnitsPerDevPixel, aDest,
aFill, aAnchor, aDirty, aImage,
aSamplingFilter, aImageFlags, aExtendMode);
if (!params.shouldDraw) {
return result;
}
{
gfxContextMatrixAutoSaveRestore contextMatrixRestorer(&aContext);
aContext.SetMatrixDouble(params.imageSpaceToDeviceSpace);
Maybe<SVGImageContext> fallbackContext;
if (!aSVGContext) {
// Use the default viewport.
fallbackContext.emplace(Some(params.svgViewportSize));
}
result = aImage->Draw(&aContext, params.size, params.region,
imgIContainer::FRAME_CURRENT, aSamplingFilter,
aSVGContext ? aSVGContext : fallbackContext,
aImageFlags, aOpacity);
}
return result;
}
/* static */ ImgDrawResult
nsLayoutUtils::DrawSingleUnscaledImage(gfxContext& aContext,
nsPresContext* aPresContext,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
const nsPoint& aDest,
const nsRect* aDirty,
uint32_t aImageFlags,
const nsRect* aSourceArea)
{
CSSIntSize imageSize;
aImage->GetWidth(&imageSize.width);
aImage->GetHeight(&imageSize.height);
if (imageSize.width < 1 || imageSize.height < 1) {
NS_WARNING("Image width or height is non-positive");
return ImgDrawResult::TEMPORARY_ERROR;
}
nsSize size(CSSPixel::ToAppUnits(imageSize));
nsRect source;
if (aSourceArea) {
source = *aSourceArea;
} else {
source.SizeTo(size);
}
nsRect dest(aDest - source.TopLeft(), size);
nsRect fill(aDest, source.Size());
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// translation but we don't want to actually tile the image.
fill.IntersectRect(fill, dest);
return DrawImageInternal(aContext, aPresContext,
aImage, aSamplingFilter,
dest, fill, aDest, aDirty ? *aDirty : dest,
/* no SVGImageContext */ Nothing(), aImageFlags);
}
/* static */ ImgDrawResult
nsLayoutUtils::DrawSingleImage(gfxContext& aContext,
nsPresContext* aPresContext,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
const nsRect& aDest,
const nsRect& aDirty,
const Maybe<SVGImageContext>& aSVGContext,
uint32_t aImageFlags,
const nsPoint* aAnchorPoint,
const nsRect* aSourceArea)
{
nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
CSSIntSize pixelImageSize(ComputeSizeForDrawingWithFallback(aImage, aDest.Size()));
if (pixelImageSize.width < 1 || pixelImageSize.height < 1) {
NS_ASSERTION(pixelImageSize.width >= 0 && pixelImageSize.height >= 0,
"Image width or height is negative");
return ImgDrawResult::SUCCESS; // no point in drawing a zero size image
}
nsSize imageSize(CSSPixel::ToAppUnits(pixelImageSize));
nsRect source;
nsCOMPtr<imgIContainer> image;
if (aSourceArea) {
source = *aSourceArea;
nsIntRect subRect(source.x, source.y, source.width, source.height);
subRect.ScaleInverseRoundOut(appUnitsPerCSSPixel);
image = ImageOps::Clip(aImage, subRect);
nsRect imageRect;
imageRect.SizeTo(imageSize);
nsRect clippedSource = imageRect.Intersect(source);
source -= clippedSource.TopLeft();
imageSize = clippedSource.Size();
} else {
source.SizeTo(imageSize);
image = aImage;
}
nsRect dest = GetWholeImageDestination(imageSize, source, aDest);
// Ensure that only a single image tile is drawn. If aSourceArea extends
// outside the image bounds, we want to honor the aSourceArea-to-aDest
// transform but we don't want to actually tile the image.
nsRect fill;
fill.IntersectRect(aDest, dest);
return DrawImageInternal(aContext, aPresContext, image,
aSamplingFilter, dest, fill,
aAnchorPoint ? *aAnchorPoint : fill.TopLeft(),
aDirty, aSVGContext, aImageFlags);
}
/* static */ void
nsLayoutUtils::ComputeSizeForDrawing(imgIContainer *aImage,
CSSIntSize& aImageSize, /*outparam*/
nsSize& aIntrinsicRatio, /*outparam*/
bool& aGotWidth, /*outparam*/
bool& aGotHeight /*outparam*/)
{
aGotWidth = NS_SUCCEEDED(aImage->GetWidth(&aImageSize.width));
aGotHeight = NS_SUCCEEDED(aImage->GetHeight(&aImageSize.height));
bool gotRatio = NS_SUCCEEDED(aImage->GetIntrinsicRatio(&aIntrinsicRatio));
if (!(aGotWidth && aGotHeight) && !gotRatio) {
// We hit an error (say, because the image failed to load or couldn't be
// decoded) and should return zero size.
aGotWidth = aGotHeight = true;
aImageSize = CSSIntSize(0, 0);
aIntrinsicRatio = nsSize(0, 0);
}
}
/* static */ CSSIntSize
nsLayoutUtils::ComputeSizeForDrawingWithFallback(imgIContainer* aImage,
const nsSize& aFallbackSize)
{
CSSIntSize imageSize;
nsSize imageRatio;
bool gotHeight, gotWidth;
ComputeSizeForDrawing(aImage, imageSize, imageRatio, gotWidth, gotHeight);
// If we didn't get both width and height, try to compute them using the
// intrinsic ratio of the image.
if (gotWidth != gotHeight) {
if (!gotWidth) {
if (imageRatio.height != 0) {
imageSize.width =
NSCoordSaturatingNonnegativeMultiply(imageSize.height,
float(imageRatio.width) /
float(imageRatio.height));
gotWidth = true;
}
} else {
if (imageRatio.width != 0) {
imageSize.height =
NSCoordSaturatingNonnegativeMultiply(imageSize.width,
float(imageRatio.height) /
float(imageRatio.width));
gotHeight = true;
}
}
}
// If we still don't have a width or height, just use the fallback size the
// caller provided.
if (!gotWidth) {
imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aFallbackSize.width);
}
if (!gotHeight) {
imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aFallbackSize.height);
}
return imageSize;
}
/* static */ IntSize
nsLayoutUtils::ComputeImageContainerDrawingParameters(imgIContainer* aImage,
nsIFrame* aForFrame,
const LayoutDeviceRect& aDestRect,
const StackingContextHelper& aSc,
uint32_t aFlags,
Maybe<SVGImageContext>& aSVGContext)
{
MOZ_ASSERT(aImage);
MOZ_ASSERT(aForFrame);
gfx::Size scaleFactors = aSc.GetInheritedScale();
SamplingFilter samplingFilter =
nsLayoutUtils::GetSamplingFilterForFrame(aForFrame);
// Compute our SVG context parameters, if any.
SVGImageContext::MaybeStoreContextPaint(aSVGContext, aForFrame, aImage);
if ((scaleFactors.width != 1.0 || scaleFactors.height != 1.0) &&
aImage->GetType() == imgIContainer::TYPE_VECTOR) {
if (!aSVGContext) {
aSVGContext.emplace();
}
gfxSize gfxDestSize(aDestRect.Width(), aDestRect.Height());
IntSize viewportSize =
aImage->OptimalImageSizeForDest(gfxDestSize,
imgIContainer::FRAME_CURRENT,
samplingFilter, aFlags);
aSVGContext->SetViewportSize(Some(CSSIntSize(viewportSize.width,
viewportSize.height)));
}
// Attempt to snap pixels, the same as ComputeSnappedImageDrawingParameters.
// Any changes to the algorithm here will need to be reflected there.
bool snapped = false;
gfxSize gfxLayerSize;
const gfx::Matrix& itm = aSc.GetInheritedTransform();
if (!itm.HasNonAxisAlignedTransform() &&
itm._11 > 0.0 &&
itm._22 > 0.0) {
gfxRect rect(gfxPoint(aDestRect.X(), aDestRect.Y()),
gfxSize(aDestRect.Width(), aDestRect.Height()));
gfxPoint p1 = ThebesPoint(itm.TransformPoint(ToPoint(rect.TopLeft())));
gfxPoint p2 = ThebesPoint(itm.TransformPoint(ToPoint(rect.TopRight())));
gfxPoint p3 = ThebesPoint(itm.TransformPoint(ToPoint(rect.BottomRight())));
if (p2 == gfxPoint(p1.x, p3.y) || p2 == gfxPoint(p3.x, p1.y)) {
p1.Round();
p3.Round();
rect.MoveTo(gfxPoint(std::min(p1.x, p3.x), std::min(p1.y, p3.y)));
rect.SizeTo(gfxSize(std::max(p1.x, p3.x) - rect.X(),
std::max(p1.y, p3.y) - rect.Y()));
// An empty size is unacceptable so we ensure our suggested size is at
// least 1 pixel wide/tall.
gfxLayerSize = gfxSize(std::max(rect.Width(), 1.0),
std::max(rect.Height(), 1.0));
snapped = true;
}
}
if (!snapped) {
// Compute our size in layer pixels.
const LayerIntSize layerSize =
RoundedToInt(LayerSize(aDestRect.Width() * scaleFactors.width,
aDestRect.Height() * scaleFactors.height));
// An empty size is unacceptable so we ensure our suggested size is at least
// 1 pixel wide/tall.
gfxLayerSize = gfxSize(std::max(layerSize.width, 1),
std::max(layerSize.height, 1));
}
return aImage->OptimalImageSizeForDest(gfxLayerSize,
imgIContainer::FRAME_CURRENT,
samplingFilter, aFlags);
}
/* static */ nsPoint
nsLayoutUtils::GetBackgroundFirstTilePos(const nsPoint& aDest,
const nsPoint& aFill,
const nsSize& aRepeatSize)
{
return nsPoint(NSToIntFloor(float(aFill.x - aDest.x) / aRepeatSize.width) * aRepeatSize.width,
NSToIntFloor(float(aFill.y - aDest.y) / aRepeatSize.height) * aRepeatSize.height) +
aDest;
}
/* static */ ImgDrawResult
nsLayoutUtils::DrawBackgroundImage(gfxContext& aContext,
nsIFrame* aForFrame,
nsPresContext* aPresContext,
imgIContainer* aImage,
const CSSIntSize& aImageSize,
SamplingFilter aSamplingFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsSize& aRepeatSize,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags,
ExtendMode aExtendMode,
float aOpacity)
{
AUTO_PROFILER_LABEL("nsLayoutUtils::DrawBackgroundImage", GRAPHICS);
Maybe<SVGImageContext> svgContext(Some(SVGImageContext(Some(aImageSize))));
SVGImageContext::MaybeStoreContextPaint(svgContext, aForFrame, aImage);
/* Fast path when there is no need for image spacing */
if (aRepeatSize.width == aDest.width && aRepeatSize.height == aDest.height) {
return DrawImageInternal(aContext, aPresContext, aImage,
aSamplingFilter, aDest, aFill, aAnchor,
aDirty, svgContext, aImageFlags, aExtendMode,
aOpacity);
}
nsPoint firstTilePos = GetBackgroundFirstTilePos(aDest.TopLeft(), aFill.TopLeft(), aRepeatSize);
for (int32_t i = firstTilePos.x; i < aFill.XMost(); i += aRepeatSize.width) {
for (int32_t j = firstTilePos.y; j < aFill.YMost(); j += aRepeatSize.height) {
nsRect dest(i, j, aDest.width, aDest.height);
ImgDrawResult result = DrawImageInternal(aContext, aPresContext, aImage, aSamplingFilter,
dest, dest, aAnchor, aDirty, svgContext,
aImageFlags, ExtendMode::CLAMP,
aOpacity);
if (result != ImgDrawResult::SUCCESS) {
return result;
}
}
}
return ImgDrawResult::SUCCESS;
}
/* static */ ImgDrawResult
nsLayoutUtils::DrawImage(gfxContext& aContext,
nsStyleContext* aStyleContext,
nsPresContext* aPresContext,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags,
float aOpacity)
{
Maybe<SVGImageContext> svgContext;
SVGImageContext::MaybeStoreContextPaint(svgContext, aStyleContext, aImage);
return DrawImageInternal(aContext, aPresContext, aImage,
aSamplingFilter, aDest, aFill, aAnchor,
aDirty,
svgContext,
aImageFlags, ExtendMode::CLAMP,
aOpacity);
}
/* static */ nsRect
nsLayoutUtils::GetWholeImageDestination(const nsSize& aWholeImageSize,
const nsRect& aImageSourceArea,
const nsRect& aDestArea)
{
double scaleX = double(aDestArea.width)/aImageSourceArea.width;
double scaleY = double(aDestArea.height)/aImageSourceArea.height;
nscoord destOffsetX = NSToCoordRound(aImageSourceArea.x*scaleX);
nscoord destOffsetY = NSToCoordRound(aImageSourceArea.y*scaleY);
nscoord wholeSizeX = NSToCoordRound(aWholeImageSize.width*scaleX);
nscoord wholeSizeY = NSToCoordRound(aWholeImageSize.height*scaleY);
return nsRect(aDestArea.TopLeft() - nsPoint(destOffsetX, destOffsetY),
nsSize(wholeSizeX, wholeSizeY));
}
/* static */ already_AddRefed<imgIContainer>
nsLayoutUtils::OrientImage(imgIContainer* aContainer,
const nsStyleImageOrientation& aOrientation)
{
MOZ_ASSERT(aContainer, "Should have an image container");
nsCOMPtr<imgIContainer> img(aContainer);
if (aOrientation.IsFromImage()) {
img = ImageOps::Orient(img, img->GetOrientation());
} else if (!aOrientation.IsDefault()) {
Angle angle = aOrientation.Angle();
Flip flip = aOrientation.IsFlipped() ? Flip::Horizontal
: Flip::Unflipped;
img = ImageOps::Orient(img, Orientation(angle, flip));
}
return img.forget();
}
static bool NonZeroStyleCoord(const nsStyleCoord& aCoord)
{
if (aCoord.IsCoordPercentCalcUnit()) {
// Since negative results are clamped to 0, check > 0.
return aCoord.ComputeCoordPercentCalc(nscoord_MAX) > 0 ||
aCoord.ComputeCoordPercentCalc(0) > 0;
}
return true;
}
/* static */ bool
nsLayoutUtils::HasNonZeroCorner(const nsStyleCorners& aCorners)
{
NS_FOR_CSS_HALF_CORNERS(corner) {
if (NonZeroStyleCoord(aCorners.Get(corner)))
return true;
}
return false;
}
// aCorner is a "full corner" value, i.e. eCornerTopLeft etc.
static bool IsCornerAdjacentToSide(uint8_t aCorner, Side aSide)
{
static_assert((int)eSideTop == eCornerTopLeft, "Check for Full Corner");
static_assert((int)eSideRight == eCornerTopRight, "Check for Full Corner");
static_assert((int)eSideBottom == eCornerBottomRight, "Check for Full Corner");
static_assert((int)eSideLeft == eCornerBottomLeft, "Check for Full Corner");
static_assert((int)eSideTop == ((eCornerTopRight - 1)&3), "Check for Full Corner");
static_assert((int)eSideRight == ((eCornerBottomRight - 1)&3), "Check for Full Corner");
static_assert((int)eSideBottom == ((eCornerBottomLeft - 1)&3), "Check for Full Corner");
static_assert((int)eSideLeft == ((eCornerTopLeft - 1)&3), "Check for Full Corner");
return aSide == aCorner || aSide == ((aCorner - 1)&3);
}
/* static */ bool
nsLayoutUtils::HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
Side aSide)
{
static_assert(eCornerTopLeftX/2 == eCornerTopLeft, "Check for Non Zero on side");
static_assert(eCornerTopLeftY/2 == eCornerTopLeft, "Check for Non Zero on side");
static_assert(eCornerTopRightX/2 == eCornerTopRight, "Check for Non Zero on side");
static_assert(eCornerTopRightY/2 == eCornerTopRight, "Check for Non Zero on side");
static_assert(eCornerBottomRightX/2 == eCornerBottomRight, "Check for Non Zero on side");
static_assert(eCornerBottomRightY/2 == eCornerBottomRight, "Check for Non Zero on side");
static_assert(eCornerBottomLeftX/2 == eCornerBottomLeft, "Check for Non Zero on side");
static_assert(eCornerBottomLeftY/2 == eCornerBottomLeft, "Check for Non Zero on side");
NS_FOR_CSS_HALF_CORNERS(corner) {
// corner is a "half corner" value, so dividing by two gives us a
// "full corner" value.
if (NonZeroStyleCoord(aCorners.Get(corner)) &&
IsCornerAdjacentToSide(corner/2, aSide))
return true;
}
return false;
}
/* static */ nsTransparencyMode
nsLayoutUtils::GetFrameTransparency(nsIFrame* aBackgroundFrame,
nsIFrame* aCSSRootFrame) {
if (aCSSRootFrame->StyleEffects()->mOpacity < 1.0f)
return eTransparencyTransparent;
if (HasNonZeroCorner(aCSSRootFrame->StyleBorder()->mBorderRadius))
return eTransparencyTransparent;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_GLASS)
return eTransparencyGlass;
if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS)
return eTransparencyBorderlessGlass;
nsITheme::Transparency transparency;
if (aCSSRootFrame->IsThemed(&transparency))
return transparency == nsITheme::eTransparent
? eTransparencyTransparent
: eTransparencyOpaque;
// We need an uninitialized window to be treated as opaque because
// doing otherwise breaks window display effects on some platforms,
// specifically Vista. (bug 450322)
if (aBackgroundFrame->IsViewportFrame() &&
!aBackgroundFrame->PrincipalChildList().FirstChild()) {
return eTransparencyOpaque;
}
nsStyleContext* bgSC;
if (!nsCSSRendering::FindBackground(aBackgroundFrame, &bgSC)) {
return eTransparencyTransparent;
}
const nsStyleBackground* bg = bgSC->StyleBackground();
if (NS_GET_A(bg->BackgroundColor(bgSC)) < 255 ||
// bottom layer's clip is used for the color
bg->BottomLayer().mClip != StyleGeometryBox::BorderBox)
return eTransparencyTransparent;
return eTransparencyOpaque;
}
static bool IsPopupFrame(nsIFrame* aFrame)
{
// aFrame is a popup it's the list control frame dropdown for a combobox.
LayoutFrameType frameType = aFrame->Type();
if (frameType == LayoutFrameType::ListControl) {
nsListControlFrame* lcf = static_cast<nsListControlFrame*>(aFrame);
return lcf->IsInDropDownMode();
}
// ... or if it's a XUL menupopup frame.
return frameType == LayoutFrameType::MenuPopup;
}
/* static */ bool
nsLayoutUtils::IsPopup(nsIFrame* aFrame)
{
// Optimization: the frame can't possibly be a popup if it has no view.
if (!aFrame->HasView()) {
NS_ASSERTION(!IsPopupFrame(aFrame), "popup frame must have a view");
return false;
}
return IsPopupFrame(aFrame);
}
/* static */ nsIFrame*
nsLayoutUtils::GetDisplayRootFrame(nsIFrame* aFrame)
{
// We could use GetRootPresContext() here if the
// NS_FRAME_IN_POPUP frame bit is set.
nsIFrame* f = aFrame;
for (;;) {
if (!f->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
f = f->PresContext()->FrameManager()->GetRootFrame();
if (!f) {
return aFrame;
}
} else if (IsPopup(f)) {
return f;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent)
return f;
f = parent;
}
}
/* static */ nsIFrame*
nsLayoutUtils::GetReferenceFrame(nsIFrame* aFrame)
{
nsIFrame *f = aFrame;
for (;;) {
const nsStyleDisplay* disp = f->StyleDisplay();
if (f->IsTransformed(disp) || f->IsPreserve3DLeaf(disp) || IsPopup(f)) {
return f;
}
nsIFrame* parent = GetCrossDocParentFrame(f);
if (!parent) {
return f;
}
f = parent;
}
}
/* static */ gfx::ShapedTextFlags
nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
const nsStyleFont* aStyleFont,
const nsStyleText* aStyleText,
nscoord aLetterSpacing)
{
gfx::ShapedTextFlags result = gfx::ShapedTextFlags();
if (aLetterSpacing != 0 ||
aStyleText->mTextJustify == StyleTextJustify::InterCharacter) {
result |= gfx::ShapedTextFlags::TEXT_DISABLE_OPTIONAL_LIGATURES;
}
if (aStyleText->mControlCharacterVisibility == NS_STYLE_CONTROL_CHARACTER_VISIBILITY_HIDDEN) {
result |= gfx::ShapedTextFlags::TEXT_HIDE_CONTROL_CHARACTERS;
}
switch (aStyleContext->StyleText()->mTextRendering) {
case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
result |= gfx::ShapedTextFlags::TEXT_OPTIMIZE_SPEED;
break;
case NS_STYLE_TEXT_RENDERING_AUTO:
if (aStyleFont->mFont.size <
aStyleContext->PresContext()->GetAutoQualityMinFontSize()) {
result |= gfx::ShapedTextFlags::TEXT_OPTIMIZE_SPEED;
}
break;
default:
break;
}
return result | GetTextRunOrientFlagsForStyle(aStyleContext);
}
/* static */ gfx::ShapedTextFlags
nsLayoutUtils::GetTextRunOrientFlagsForStyle(nsStyleContext* aStyleContext)
{
uint8_t writingMode = aStyleContext->StyleVisibility()->mWritingMode;
switch (writingMode) {
case NS_STYLE_WRITING_MODE_HORIZONTAL_TB:
return gfx::ShapedTextFlags::TEXT_ORIENT_HORIZONTAL;
case NS_STYLE_WRITING_MODE_VERTICAL_LR:
case NS_STYLE_WRITING_MODE_VERTICAL_RL:
switch (aStyleContext->StyleVisibility()->mTextOrientation) {
case NS_STYLE_TEXT_ORIENTATION_MIXED:
return gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_MIXED;
case NS_STYLE_TEXT_ORIENTATION_UPRIGHT:
return gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_UPRIGHT;
case NS_STYLE_TEXT_ORIENTATION_SIDEWAYS:
return gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
default:
NS_NOTREACHED("unknown text-orientation");
return gfx::ShapedTextFlags();
}
case NS_STYLE_WRITING_MODE_SIDEWAYS_LR:
return gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_LEFT;
case NS_STYLE_WRITING_MODE_SIDEWAYS_RL:
return gfx::ShapedTextFlags::TEXT_ORIENT_VERTICAL_SIDEWAYS_RIGHT;
default:
NS_NOTREACHED("unknown writing-mode");
return gfx::ShapedTextFlags();
}
}
/* static */ void
nsLayoutUtils::GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
nsRect* aHStrip, nsRect* aVStrip) {
NS_ASSERTION(aR1.TopLeft() == aR2.TopLeft(),
"expected rects at the same position");
nsRect unionRect(aR1.x, aR1.y, std::max(aR1.width, aR2.width),
std::max(aR1.height, aR2.height));
nscoord VStripStart = std::min(aR1.width, aR2.width);
nscoord HStripStart = std::min(aR1.height, aR2.height);
*aVStrip = unionRect;
aVStrip->x += VStripStart;
aVStrip->width -= VStripStart;
*aHStrip = unionRect;
aHStrip->y += HStripStart;
aHStrip->height -= HStripStart;
}
nsDeviceContext*
nsLayoutUtils::GetDeviceContextForScreenInfo(nsPIDOMWindowOuter* aWindow)
{
if (!aWindow) {
return nullptr;
}
nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
while (docShell) {
// Now make sure our size is up to date. That will mean that the device
// context does the right thing on multi-monitor systems when we return it to
// the caller. It will also make sure that our prescontext has been created,
// if we're supposed to have one.
nsCOMPtr<nsPIDOMWindowOuter> win = docShell->GetWindow();
if (!win) {
// No reason to go on
return nullptr;
}
win->EnsureSizeAndPositionUpToDate();
RefPtr<nsPresContext> presContext;
docShell->GetPresContext(getter_AddRefs(presContext));
if (presContext) {
nsDeviceContext* context = presContext->DeviceContext();
if (context) {
return context;
}
}
nsCOMPtr<nsIDocShellTreeItem> parentItem;
docShell->GetParent(getter_AddRefs(parentItem));
docShell = do_QueryInterface(parentItem);
}
return nullptr;
}
/* static */ bool
nsLayoutUtils::IsReallyFixedPos(const nsIFrame* aFrame)
{
MOZ_ASSERT(aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED,
"IsReallyFixedPos called on non-'position:fixed' frame");
return MayBeReallyFixedPos(aFrame);
}
/* static */ bool
nsLayoutUtils::MayBeReallyFixedPos(const nsIFrame* aFrame)
{
MOZ_ASSERT(aFrame->GetParent(),
"MayBeReallyFixedPos called on frame not in tree");
LayoutFrameType parentType = aFrame->GetParent()->Type();
return parentType == LayoutFrameType::Viewport ||
parentType == LayoutFrameType::PageContent;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromOffscreenCanvas(OffscreenCanvas* aOffscreenCanvas,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
SurfaceFromElementResult result;
nsIntSize size = aOffscreenCanvas->GetWidthHeight();
result.mSourceSurface = aOffscreenCanvas->GetSurfaceSnapshot(&result.mAlphaType);
if (!result.mSourceSurface) {
// If the element doesn't have a context then we won't get a snapshot. The canvas spec wants us to not error and just
// draw nothing, so return an empty surface.
result.mAlphaType = gfxAlphaType::Opaque;
RefPtr<DrawTarget> ref =
aTarget ? aTarget
: gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<DrawTarget> dt = ref->CreateSimilarDrawTarget(IntSize(size.width, size.height),
SurfaceFormat::B8G8R8A8);
if (dt) {
result.mSourceSurface = dt->Snapshot();
}
} else if (aTarget) {
RefPtr<SourceSurface> opt = aTarget->OptimizeSourceSurface(result.mSourceSurface);
if (opt) {
result.mSourceSurface = opt;
}
}
result.mHasSize = true;
result.mSize = size;
result.mIsWriteOnly = aOffscreenCanvas->IsWriteOnly();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(nsIImageLoadingContent* aElement,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
SurfaceFromElementResult result;
nsresult rv;
nsCOMPtr<imgIRequest> imgRequest;
rv = aElement->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (NS_FAILED(rv)) {
return result;
}
if (!imgRequest) {
// There's no image request. This is either because a request for
// a non-empty URI failed, or the URI is the empty string.
nsCOMPtr<nsIURI> currentURI;
aElement->GetCurrentURI(getter_AddRefs(currentURI));
if (!currentURI) {
// Treat the empty URI as available instead of broken state.
result.mHasSize = true;
}
return result;
}
uint32_t status;
imgRequest->GetImageStatus(&status);
result.mHasSize = status & imgIRequest::STATUS_SIZE_AVAILABLE;
if ((status & imgIRequest::STATUS_LOAD_COMPLETE) == 0) {
// Spec says to use GetComplete, but that only works on
// HTMLImageElement, and we support all sorts of other stuff
// here. Do this for now pending spec clarification.
result.mIsStillLoading = (status & imgIRequest::STATUS_ERROR) == 0;
return result;
}
nsCOMPtr<nsIPrincipal> principal;
rv = imgRequest->GetImagePrincipal(getter_AddRefs(principal));
if (NS_FAILED(rv)) {
return result;
}
nsCOMPtr<imgIContainer> imgContainer;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
if (NS_FAILED(rv)) {
return result;
}
uint32_t noRasterize = aSurfaceFlags & SFE_NO_RASTERIZING_VECTORS;
uint32_t whichFrame = (aSurfaceFlags & SFE_WANT_FIRST_FRAME_IF_IMAGE)
? (uint32_t) imgIContainer::FRAME_FIRST
: (uint32_t) imgIContainer::FRAME_CURRENT;
uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE
| imgIContainer::FLAG_ASYNC_NOTIFY;
if (aSurfaceFlags & SFE_NO_COLORSPACE_CONVERSION)
frameFlags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
if (aSurfaceFlags & SFE_PREFER_NO_PREMULTIPLY_ALPHA) {
frameFlags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
}
int32_t imgWidth, imgHeight;
nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
HTMLImageElement* element = HTMLImageElement::FromContentOrNull(content);
if (aSurfaceFlags & SFE_USE_ELEMENT_SIZE_IF_VECTOR &&
element &&
imgContainer->GetType() == imgIContainer::TYPE_VECTOR) {
// We're holding a strong ref to "element" via "content".
imgWidth = MOZ_KnownLive(element)->Width();
imgHeight = MOZ_KnownLive(element)->Height();
} else {
rv = imgContainer->GetWidth(&imgWidth);
nsresult rv2 = imgContainer->GetHeight(&imgHeight);
if (NS_FAILED(rv) || NS_FAILED(rv2))
return result;
}
result.mSize = IntSize(imgWidth, imgHeight);
if (!noRasterize || imgContainer->GetType() == imgIContainer::TYPE_RASTER) {
if (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) {
frameFlags |= imgIContainer::FLAG_WANT_DATA_SURFACE;
}
result.mSourceSurface = imgContainer->GetFrameAtSize(result.mSize, whichFrame, frameFlags);
if (!result.mSourceSurface) {
return result;
}
// The surface we return is likely to be cached. We don't want to have to
// convert to a surface that's compatible with aTarget each time it's used
// (that would result in terrible performance), so we convert once here
// upfront if aTarget is specified.
if (aTarget) {
RefPtr<SourceSurface> optSurface =
aTarget->OptimizeSourceSurface(result.mSourceSurface);
if (optSurface) {
result.mSourceSurface = optSurface;
}
}
const auto& format = result.mSourceSurface->GetFormat();
if (IsOpaque(format)) {
result.mAlphaType = gfxAlphaType::Opaque;
} else if (frameFlags & imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA) {
result.mAlphaType = gfxAlphaType::NonPremult;
} else {
result.mAlphaType = gfxAlphaType::Premult;
}
} else {
result.mDrawInfo.mImgContainer = imgContainer;
result.mDrawInfo.mWhichFrame = whichFrame;
result.mDrawInfo.mDrawingFlags = frameFlags;
}
int32_t corsmode;
if (NS_SUCCEEDED(imgRequest->GetCORSMode(&corsmode))) {
result.mCORSUsed = (corsmode != imgIRequest::CORS_NONE);
}
result.mPrincipal = principal.forget();
// no images, including SVG images, can load content from another domain.
result.mIsWriteOnly = false;
result.mImageRequest = imgRequest.forget();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLImageElement *aElement,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
return SurfaceFromElement(static_cast<nsIImageLoadingContent*>(aElement),
aSurfaceFlags, aTarget);
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLCanvasElement* aElement,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
SurfaceFromElementResult result;
IntSize size = aElement->GetSize();
result.mSourceSurface = aElement->GetSurfaceSnapshot(&result.mAlphaType);
if (!result.mSourceSurface) {
// If the element doesn't have a context then we won't get a snapshot. The canvas spec wants us to not error and just
// draw nothing, so return an empty surface.
result.mAlphaType = gfxAlphaType::Opaque;
RefPtr<DrawTarget> ref =
aTarget ? aTarget
: gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
RefPtr<DrawTarget> dt = ref->CreateSimilarDrawTarget(IntSize(size.width, size.height),
SurfaceFormat::B8G8R8A8);
if (dt) {
result.mSourceSurface = dt->Snapshot();
}
} else if (aTarget) {
RefPtr<SourceSurface> opt = aTarget->OptimizeSourceSurface(result.mSourceSurface);
if (opt) {
result.mSourceSurface = opt;
}
}
// Ensure that any future changes to the canvas trigger proper invalidation,
// in case this is being used by -moz-element()
aElement->MarkContextClean();
result.mHasSize = true;
result.mSize = size;
result.mPrincipal = aElement->NodePrincipal();
result.mIsWriteOnly = aElement->IsWriteOnly();
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(HTMLVideoElement* aElement,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
SurfaceFromElementResult result;
result.mAlphaType = gfxAlphaType::Opaque; // Assume opaque.
if (aElement->ContainsRestrictedContent()) {
return result;
}
uint16_t readyState;
if (NS_SUCCEEDED(aElement->GetReadyState(&readyState)) &&
(readyState == nsIDOMHTMLMediaElement::HAVE_NOTHING ||
readyState == nsIDOMHTMLMediaElement::HAVE_METADATA)) {
result.mIsStillLoading = true;
return result;
}
// If it doesn't have a principal, just bail
nsCOMPtr<nsIPrincipal> principal = aElement->GetCurrentVideoPrincipal();
if (!principal)
return result;
result.mLayersImage = aElement->GetCurrentImage();
if (!result.mLayersImage)
return result;
if (aTarget) {
// They gave us a DrawTarget to optimize for, so even though we have a layers::Image,
// we should unconditionally grab a SourceSurface and try to optimize it.
result.mSourceSurface = result.mLayersImage->GetAsSourceSurface();
if (!result.mSourceSurface)
return result;
RefPtr<SourceSurface> opt = aTarget->OptimizeSourceSurface(result.mSourceSurface);
if (opt) {
result.mSourceSurface = opt;
}
}
result.mCORSUsed = aElement->GetCORSMode() != CORS_NONE;
result.mHasSize = true;
result.mSize = result.mLayersImage->GetSize();
result.mPrincipal = principal.forget();
result.mIsWriteOnly = false;
return result;
}
nsLayoutUtils::SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElement(dom::Element* aElement,
uint32_t aSurfaceFlags,
RefPtr<DrawTarget>& aTarget)
{
// If it's a <canvas>, we may be able to just grab its internal surface
if (HTMLCanvasElement* canvas =
HTMLCanvasElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(canvas, aSurfaceFlags, aTarget);
}
// Maybe it's <video>?
if (HTMLVideoElement* video =
HTMLVideoElement::FromContentOrNull(aElement)) {
return SurfaceFromElement(video, aSurfaceFlags, aTarget);
}
// Finally, check if it's a normal image
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aElement);
if (!imageLoader) {
return SurfaceFromElementResult();
}
return SurfaceFromElement(imageLoader, aSurfaceFlags, aTarget);
}
/* static */
Element*
nsLayoutUtils::GetEditableRootContentByContentEditable(nsIDocument* aDocument)
{
// If the document is in designMode we should return nullptr.
if (!aDocument || aDocument->HasFlag(NODE_IS_EDITABLE)) {
return nullptr;
}
// contenteditable only works with HTML document.
// Note: Use nsIDOMHTMLDocument rather than nsIHTMLDocument for getting the
// body node because nsIDOMHTMLDocument::GetBody() does something
// additional work for some cases and EditorBase uses them.
nsCOMPtr<nsIDOMHTMLDocument> domHTMLDoc = do_QueryInterface(aDocument);
if (!domHTMLDoc) {
return nullptr;
}
Element* rootElement = aDocument->GetRootElement();
if (rootElement && rootElement->IsEditable()) {
return rootElement;
}
// If there are no editable root element, check its <body> element.
// Note that the body element could be <frameset> element.
nsCOMPtr<nsIDOMHTMLElement> body;
nsresult rv = domHTMLDoc->GetBody(getter_AddRefs(body));
nsCOMPtr<Element> content = do_QueryInterface(body);
if (NS_SUCCEEDED(rv) && content && content->IsEditable()) {
return content;
}
return nullptr;
}
#ifdef DEBUG
/* static */ void
nsLayoutUtils::AssertNoDuplicateContinuations(nsIFrame* aContainer,
const nsFrameList& aFrameList)
{
for (nsIFrame* f : aFrameList) {
// Check only later continuations of f; we deal with checking the
// earlier continuations when we hit those earlier continuations in
// the frame list.
for (nsIFrame *c = f; (c = c->GetNextInFlow());) {
NS_ASSERTION(c->GetParent() != aContainer ||
!aFrameList.ContainsFrame(c),
"Two continuations of the same frame in the same "
"frame list");
}
}
}
// Is one of aFrame's ancestors a letter frame?
static bool
IsInLetterFrame(nsIFrame *aFrame)
{
for (nsIFrame *f = aFrame->GetParent(); f; f = f->GetParent()) {
if (f->IsLetterFrame()) {
return true;
}
}
return false;
}
/* static */ void
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot)
{
NS_ASSERTION(aSubtreeRoot->GetPrevInFlow(),
"frame tree not empty, but caller reported complete status");
// Also assert that text frames map no text.
int32_t start, end;
nsresult rv = aSubtreeRoot->GetOffsets(start, end);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetOffsets failed");
// In some cases involving :first-letter, we'll partially unlink a
// continuation in the middle of a continuation chain from its
// previous and next continuations before destroying it, presumably so
// that we don't also destroy the later continuations. Once we've
// done this, GetOffsets returns incorrect values.
// For examples, see list of tests in
// https://bugzilla.mozilla.org/show_bug.cgi?id=619021#c29
NS_ASSERTION(start == end || IsInLetterFrame(aSubtreeRoot),
"frame tree not empty, but caller reported complete status");
nsIFrame::ChildListIterator lists(aSubtreeRoot);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(childFrames.get());
}
}
}
#endif
static void
GetFontFacesForFramesInner(nsIFrame* aFrame, nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (aFrame->IsTextFrame()) {
if (!aFrame->GetPrevContinuation()) {
nsLayoutUtils::GetFontFacesForText(aFrame, 0, INT32_MAX, true,
aFontFaceList);
}
return;
}
nsIFrame::ChildListID childLists[] = { nsIFrame::kPrincipalList,
nsIFrame::kPopupList };
for (size_t i = 0; i < ArrayLength(childLists); ++i) {
nsFrameList children(aFrame->GetChildList(childLists[i]));
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
child = nsPlaceholderFrame::GetRealFrameFor(child);
GetFontFacesForFramesInner(child, aFontFaceList);
}
}
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForFrames(nsIFrame* aFrame,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
while (aFrame) {
GetFontFacesForFramesInner(aFrame, aFontFaceList);
aFrame = GetNextContinuationOrIBSplitSibling(aFrame);
}
return NS_OK;
}
/* static */
nsresult
nsLayoutUtils::GetFontFacesForText(nsIFrame* aFrame,
int32_t aStartOffset, int32_t aEndOffset,
bool aFollowContinuations,
nsFontFaceList* aFontFaceList)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
if (!aFrame->IsTextFrame()) {
return NS_OK;
}
nsTextFrame* curr = static_cast<nsTextFrame*>(aFrame);
do {
int32_t fstart = std::max(curr->GetContentOffset(), aStartOffset);
int32_t fend = std::min(curr->GetContentEnd(), aEndOffset);
if (fstart >= fend) {
curr = static_cast<nsTextFrame*>(curr->GetNextContinuation());
continue;
}
// curr is overlapping with the offset we want
gfxSkipCharsIterator iter = curr->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = curr->GetTextRun(nsTextFrame::eInflated);
NS_ENSURE_TRUE(textRun, NS_ERROR_OUT_OF_MEMORY);
// include continuations in the range that share the same textrun
nsTextFrame* next = nullptr;
if (aFollowContinuations && fend < aEndOffset) {
next = static_cast<nsTextFrame*>(curr->GetNextContinuation());
while (next && next->GetTextRun(nsTextFrame::eInflated) == textRun) {
fend = std::min(next->GetContentEnd(), aEndOffset);
next = fend < aEndOffset ?
static_cast<nsTextFrame*>(next->GetNextContinuation()) : nullptr;
}
}
uint32_t skipStart = iter.ConvertOriginalToSkipped(fstart);
uint32_t skipEnd = iter.ConvertOriginalToSkipped(fend);
aFontFaceList->AddFontsFromTextRun(textRun, skipStart, skipEnd - skipStart);
curr = next;
} while (aFollowContinuations && curr);
return NS_OK;
}
/* static */
size_t
nsLayoutUtils::SizeOfTextRunsForFrames(nsIFrame* aFrame,
MallocSizeOf aMallocSizeOf,
bool clear)
{
NS_PRECONDITION(aFrame, "NULL frame pointer");
size_t total = 0;
if (aFrame->IsTextFrame()) {
nsTextFrame* textFrame = static_cast<nsTextFrame*>(aFrame);
for (uint32_t i = 0; i < 2; ++i) {
gfxTextRun *run = textFrame->GetTextRun(
(i != 0) ? nsTextFrame::eInflated : nsTextFrame::eNotInflated);
if (run) {
if (clear) {
run->ResetSizeOfAccountingFlags();
} else {
total += run->MaybeSizeOfIncludingThis(aMallocSizeOf);
}
}
}
return total;
}
AutoTArray<nsIFrame::ChildList,4> childListArray;
aFrame->GetChildLists(&childListArray);
for (nsIFrame::ChildListArrayIterator childLists(childListArray);
!childLists.IsDone(); childLists.Next()) {
for (nsFrameList::Enumerator e(childLists.CurrentList());
!e.AtEnd(); e.Next()) {
total += SizeOfTextRunsForFrames(e.get(), aMallocSizeOf, clear);
}
}
return total;
}
struct PrefCallbacks
{
const char* name;
PrefChangedFunc func;
};
static const PrefCallbacks kPrefCallbacks[] = {
{ WEBKIT_PREFIXES_ENABLED_PREF_NAME,
WebkitPrefixEnabledPrefChangeCallback },
{ TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME,
TextAlignUnsafeEnabledPrefChangeCallback },
{ FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME,
FloatLogicalValuesEnabledPrefChangeCallback },
};
/* static */
void
nsLayoutUtils::Initialize()
{
Preferences::AddUintVarCache(&sFontSizeInflationMaxRatio,
"font.size.inflation.maxRatio");
Preferences::AddUintVarCache(&sFontSizeInflationEmPerLine,
"font.size.inflation.emPerLine");
Preferences::AddUintVarCache(&sFontSizeInflationMinTwips,
"font.size.inflation.minTwips");
Preferences::AddUintVarCache(&sFontSizeInflationLineThreshold,
"font.size.inflation.lineThreshold");
Preferences::AddIntVarCache(&sFontSizeInflationMappingIntercept,
"font.size.inflation.mappingIntercept");
Preferences::AddBoolVarCache(&sFontSizeInflationForceEnabled,
"font.size.inflation.forceEnabled");
Preferences::AddBoolVarCache(&sFontSizeInflationDisabledInMasterProcess,
"font.size.inflation.disabledInMasterProcess");
Preferences::AddUintVarCache(&sSystemFontScale,
"font.size.systemFontScale", 100);
Preferences::AddUintVarCache(&sZoomMaxPercent,
"zoom.maxPercent", 300);
Preferences::AddUintVarCache(&sZoomMinPercent,
"zoom.minPercent", 30);
Preferences::AddBoolVarCache(&sInvalidationDebuggingIsEnabled,
"nglayout.debug.invalidation");
Preferences::AddBoolVarCache(&sInterruptibleReflowEnabled,
"layout.interruptible-reflow.enabled");
Preferences::AddBoolVarCache(&sSVGTransformBoxEnabled,
"svg.transform-box.enabled");
Preferences::AddBoolVarCache(&sTextCombineUprightDigitsEnabled,
"layout.css.text-combine-upright-digits.enabled");
#ifdef MOZ_STYLO
if (PR_GetEnv("STYLO_FORCE_ENABLED")) {
sStyloEnabled = true;
} else if (PR_GetEnv("STYLO_FORCE_DISABLED")) {
sStyloEnabled = false;
} else {
Preferences::AddBoolVarCache(&sStyloEnabled,
"layout.css.servo.enabled");
}
// We should only create the blocklist ONCE, and ignore any blocklist
// reloads happen. Because otherwise we could have a top level page that
// uses Stylo (if its load happens before the blocklist reload) and a
// child iframe that uses Gecko (if its load happens after the blocklist
// reload). If some page contains both backends, and they try to move
// element across backend boundary, it could crash (see bug 1404020).
sStyloBlocklistEnabled =
Preferences::GetBool("layout.css.stylo-blocklist.enabled");
if (sStyloBlocklistEnabled && !sStyloBlocklist) {
nsAutoCString blocklist;
Preferences::GetCString("layout.css.stylo-blocklist.blocked_domains", blocklist);
if (!blocklist.IsEmpty()) {
sStyloBlocklist = new nsTArray<nsCString>;
for (const nsACString& domainString : blocklist.Split(',')) {
sStyloBlocklist->AppendElement(domainString);
}
}
}
#endif
Preferences::AddUintVarCache(&sIdlePeriodDeadlineLimit,
"layout.idle_period.time_limit",
DEFAULT_IDLE_PERIOD_TIME_LIMIT);
Preferences::AddUintVarCache(&sQuiescentFramesBeforeIdlePeriod,
"layout.idle_period.required_quiescent_frames",
DEFAULT_QUIESCENT_FRAMES);
for (auto& callback : kPrefCallbacks) {
Preferences::RegisterCallbackAndCall(callback.func, callback.name);
}
nsComputedDOMStyle::RegisterPrefChangeCallbacks();
}
/* static */
void
nsLayoutUtils::Shutdown()
{
if (sContentMap) {
delete sContentMap;
sContentMap = nullptr;
}
#ifdef MOZ_STYLO
if (sStyloBlocklist) {
sStyloBlocklist->Clear();
delete sStyloBlocklist;
sStyloBlocklist = nullptr;
}
#endif
for (auto& callback : kPrefCallbacks) {
Preferences::UnregisterCallback(callback.func, callback.name);
}
nsComputedDOMStyle::UnregisterPrefChangeCallbacks();
// so the cached initial quotes array doesn't appear to be a leak
nsStyleList::Shutdown();
}
#ifdef MOZ_STYLO
/* static */
bool
nsLayoutUtils::ShouldUseStylo(nsIURI* aDocumentURI, nsIPrincipal* aPrincipal)
{
// Disable stylo for system principal because XUL hasn't been fully
// supported. Other principal aren't able to use XUL by default, and
// the back door to enable XUL is mostly just for testing, which means
// they don't matter, and we shouldn't respect them at the same time.
if (!StyloChromeEnabled() &&
nsContentUtils::IsSystemPrincipal(aPrincipal)) {
return false;
}
// Check any internal page which we need to explicitly blacklist.
if (aDocumentURI) {
bool isAbout = false;
if (NS_SUCCEEDED(aDocumentURI->SchemeIs("about", &isAbout)) && isAbout) {
nsAutoCString path;
aDocumentURI->GetFilePath(path);
// about:reader requires support of scoped style, so we have to
// use Gecko backend for now. See bug 1402094.
// This should be fixed by bug 1204818.
if (path.EqualsLiteral("reader")) {
return false;
}
}
}
// Check the stylo block list.
if (IsInStyloBlocklist(aPrincipal)) {
return false;
}
return true;
}
/* static */
bool
nsLayoutUtils::IsInStyloBlocklist(nsIPrincipal* aPrincipal)
{
if (!sStyloBlocklist) {
return false;
}
// Note that a non-codebase principal (eg the system principal) will return
// a null URI.
nsCOMPtr<nsIURI> codebaseURI;
aPrincipal->GetURI(getter_AddRefs(codebaseURI));
if (!codebaseURI) {
return false;
}
nsCOMPtr<nsIEffectiveTLDService> tldService =
do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
NS_ENSURE_TRUE(tldService, false);
// Check if a document's eTLD+1 domain belongs to one of the stylo blocklist.
nsAutoCString baseDomain;
NS_SUCCEEDED(tldService->GetBaseDomain(codebaseURI, 0, baseDomain));
for (const nsCString& domains : *sStyloBlocklist) {
if (baseDomain.Equals(domains)) {
return true;
}
}
return false;
}
/* static */
void
nsLayoutUtils::AddToStyloBlocklist(const nsACString& aBlockedDomain)
{
if (!sStyloBlocklist) {
sStyloBlocklist = new nsTArray<nsCString>;
}
sStyloBlocklist->AppendElement(aBlockedDomain);
}
/* static */
void
nsLayoutUtils::RemoveFromStyloBlocklist(const nsACString& aBlockedDomain)
{
if (!sStyloBlocklist) {
return;
}
sStyloBlocklist->RemoveElement(aBlockedDomain);
if (sStyloBlocklist->IsEmpty()) {
delete sStyloBlocklist;
sStyloBlocklist = nullptr;
}
}
/* static */
bool
nsLayoutUtils::StyloChromeEnabled()
{
static bool sInitialized = false;
static bool sEnabled = false;
if (!sInitialized) {
// We intentionally don't allow dynamic toggling of this pref
// because it is rather risky to mix style backend in XUL.
sEnabled = Preferences::GetBool("layout.css.servo.chrome.enabled");
sInitialized = true;
}
return sEnabled;
}
#endif
/* static */
void
nsLayoutUtils::RegisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
/* static */
void
nsLayoutUtils::RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
if (aRequestRegistered && *aRequestRegistered) {
// Our request is already registered with the refresh driver, so
// no need to register it again.
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
// Check to verify that the image is animated. If so, then add it to the
// list of images tracked by the refresh driver.
bool isAnimated = false;
nsresult rv = image->GetAnimated(&isAnimated);
if (NS_SUCCEEDED(rv) && isAnimated) {
if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
NS_WARNING("Unable to add image request");
return;
}
if (aRequestRegistered) {
*aRequestRegistered = true;
}
}
}
}
}
/* static */
void
nsLayoutUtils::DeregisterImageRequest(nsPresContext* aPresContext,
imgIRequest* aRequest,
bool* aRequestRegistered)
{
if (!aPresContext) {
return;
}
// Deregister our imgIRequest with the refresh driver to
// complete tear-down, but only if it has been registered
if (aRequestRegistered && !*aRequestRegistered) {
return;
}
if (aRequest) {
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
aPresContext->RefreshDriver()->RemoveImageRequest(aRequest);
if (aRequestRegistered) {
*aRequestRegistered = false;
}
}
}
}
/* static */
void
nsLayoutUtils::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
nsIDocument* doc = aElement->GetComposedDoc();
if (doc) {
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (presShell) {
presShell->GetPresContext()->RestyleManager()->PostRestyleEvent(
aElement, aRestyleHint, aMinChangeHint);
}
}
}
nsSetAttrRunnable::nsSetAttrRunnable(Element* aElement,
nsAtom* aAttrName,
const nsAString& aValue)
: mozilla::Runnable("nsSetAttrRunnable")
, mElement(aElement)
, mAttrName(aAttrName)
, mValue(aValue)
{
NS_ASSERTION(aElement && aAttrName, "Missing stuff, prepare to crash");
}
nsSetAttrRunnable::nsSetAttrRunnable(Element* aElement,
nsAtom* aAttrName,
int32_t aValue)
: mozilla::Runnable("nsSetAttrRunnable")
, mElement(aElement)
, mAttrName(aAttrName)
{
NS_ASSERTION(aElement && aAttrName, "Missing stuff, prepare to crash");
mValue.AppendInt(aValue);
}
NS_IMETHODIMP
nsSetAttrRunnable::Run()
{
return mElement->SetAttr(kNameSpaceID_None, mAttrName, mValue, true);
}
nsUnsetAttrRunnable::nsUnsetAttrRunnable(Element* aElement,
nsAtom* aAttrName)
: mozilla::Runnable("nsUnsetAttrRunnable")
, mElement(aElement)
, mAttrName(aAttrName)
{
NS_ASSERTION(aElement && aAttrName, "Missing stuff, prepare to crash");
}
NS_IMETHODIMP
nsUnsetAttrRunnable::Run()
{
return mElement->UnsetAttr(kNameSpaceID_None, mAttrName, true);
}
/**
* Compute the minimum font size inside of a container with the given
* width, such that **when the user zooms the container to fill the full
* width of the device**, the fonts satisfy our minima.
*/
static nscoord
MinimumFontSizeFor(nsPresContext* aPresContext, WritingMode aWritingMode,
nscoord aContainerISize)
{
nsIPresShell* presShell = aPresContext->PresShell();
uint32_t emPerLine = presShell->FontSizeInflationEmPerLine();
uint32_t minTwips = presShell->FontSizeInflationMinTwips();
if (emPerLine == 0 && minTwips == 0) {
return 0;
}
// Clamp the container width to the device dimensions
nscoord iFrameISize = aWritingMode.IsVertical()
? aPresContext->GetVisibleArea().height
: aPresContext->GetVisibleArea().width;
nscoord effectiveContainerISize = std::min(iFrameISize, aContainerISize);
nscoord byLine = 0, byInch = 0;
if (emPerLine != 0) {
byLine = effectiveContainerISize / emPerLine;
}
if (minTwips != 0) {
// REVIEW: Is this giving us app units and sizes *not* counting
// viewport scaling?
gfxSize screenSize = aPresContext->ScreenSizeInchesForFontInflation();
float deviceISizeInches = aWritingMode.IsVertical()
? screenSize.height : screenSize.width;
byInch = NSToCoordRound(effectiveContainerISize /
(deviceISizeInches * 1440 /
minTwips ));
}
return std::max(byLine, byInch);
}
/* static */ float
nsLayoutUtils::FontSizeInflationInner(const nsIFrame *aFrame,
nscoord aMinFontSize)
{
// Note that line heights should be inflated by the same ratio as the
// font size of the same text; thus we operate only on the font size
// even when we're scaling a line height.
nscoord styleFontSize = aFrame->StyleFont()->mFont.size;
if (styleFontSize <= 0) {
// Never scale zero font size.
return 1.0;
}
if (aMinFontSize <= 0) {
// No need to scale.
return 1.0;
}
// If between this current frame and its font inflation container there is a
// non-inline element with fixed width or height, then we should not inflate
// fonts for this frame.
for (const nsIFrame* f = aFrame;
f && !f->IsContainerForFontSizeInflation();
f = f->GetParent()) {
nsIContent* content = f->GetContent();
LayoutFrameType fType = f->Type();
nsIFrame* parent = f->GetParent();
// Also, if there is more than one frame corresponding to a single
// content node, we want the outermost one.
if (!(parent && parent->GetContent() == content) &&
// ignore width/height on inlines since they don't apply
fType != LayoutFrameType::Inline &&
// ignore width on radios and checkboxes since we enlarge them and
// they have width/height in ua.css
fType != LayoutFrameType::CheckboxRadio) {
// ruby annotations should have the same inflation as its
// grandparent, which is the ruby frame contains the annotation.
if (fType == LayoutFrameType::RubyText) {
MOZ_ASSERT(parent && parent->IsRubyTextContainerFrame());
nsIFrame* grandparent = parent->GetParent();
MOZ_ASSERT(grandparent && grandparent->IsRubyFrame());
return FontSizeInflationFor(grandparent);
}
nsStyleCoord stylePosWidth = f->StylePosition()->mWidth;
nsStyleCoord stylePosHeight = f->StylePosition()->mHeight;
if (stylePosWidth.GetUnit() != eStyleUnit_Auto ||
stylePosHeight.GetUnit() != eStyleUnit_Auto) {
return 1.0;
}
}
}
int32_t interceptParam = nsLayoutUtils::FontSizeInflationMappingIntercept();
float maxRatio = (float)nsLayoutUtils::FontSizeInflationMaxRatio() / 100.0f;
float ratio = float(styleFontSize) / float(aMinFontSize);
float inflationRatio;
// Given a minimum inflated font size m, a specified font size s, we want to
// find the inflated font size i and then return the ratio of i to s (i/s).
if (interceptParam >= 0) {
// Since the mapping intercept parameter P is greater than zero, we use it
// to determine the point where our mapping function intersects the i=s
// line. This means that we have an equation of the form:
//
// i = m + s·(P/2)/(1 + P/2), if s <= (1 + P/2)·m
// i = s, if s >= (1 + P/2)·m
float intercept = 1 + float(interceptParam)/2.0f;
if (ratio >= intercept) {
// If we're already at 1+P/2 or more times the minimum, don't scale.
return 1.0;
}
// The point (intercept, intercept) is where the part of the i vs. s graph
// that's not slope 1 meets the i=s line. (This part of the
// graph is a line from (0, m), to that point). We calculate the
// intersection point to be ((1+P/2)m, (1+P/2)m), where P is the
// intercept parameter above. We then need to return i/s.
inflationRatio = (1.0f + (ratio * (intercept - 1) / intercept)) / ratio;
} else {
// This is the case where P is negative. We essentially want to implement
// the case for P=infinity here, so we make i = s + m, which means that
// i/s = s/s + m/s = 1 + 1/ratio
inflationRatio = 1 + 1.0f / ratio;
}
if (maxRatio > 1.0 && inflationRatio > maxRatio) {
return maxRatio;
} else {
return inflationRatio;
}
}
static bool
ShouldInflateFontsForContainer(const nsIFrame *aFrame)
{
// We only want to inflate fonts for text that is in a place
// with room to expand. The question is what the best heuristic for
// that is...
// For now, we're going to use NS_FRAME_IN_CONSTRAINED_BSIZE, which
// indicates whether the frame is inside something with a constrained
// block-size (propagating down the tree), but the propagation stops when
// we hit overflow-y [or -x, for vertical mode]: scroll or auto.
const nsStyleText* styleText = aFrame->StyleText();
return styleText->mTextSizeAdjust != NS_STYLE_TEXT_SIZE_ADJUST_NONE &&
!(aFrame->GetStateBits() & NS_FRAME_IN_CONSTRAINED_BSIZE) &&
// We also want to disable font inflation for containers that have
// preformatted text.
// MathML cells need special treatment. See bug 1002526 comment 56.
(styleText->WhiteSpaceCanWrap(aFrame) ||
aFrame->IsFrameOfType(nsIFrame::eMathML));
}
nscoord
nsLayoutUtils::InflationMinFontSizeFor(const nsIFrame *aFrame)
{
nsPresContext *presContext = aFrame->PresContext();
if (!FontSizeInflationEnabled(presContext) ||
presContext->mInflationDisabledForShrinkWrap) {
return 0;
}
for (const nsIFrame *f = aFrame; f; f = f->GetParent()) {
if (f->IsContainerForFontSizeInflation()) {
if (!ShouldInflateFontsForContainer(f)) {
return 0;
}
nsFontInflationData *data =
nsFontInflationData::FindFontInflationDataFor(aFrame);
// FIXME: The need to null-check here is sort of a bug, and might
// lead to incorrect results.
if (!data || !data->InflationEnabled()) {
return 0;
}
return MinimumFontSizeFor(aFrame->PresContext(),
aFrame->GetWritingMode(),
data->EffectiveISize());
}
}
MOZ_ASSERT(false, "root should always be container");
return 0;
}
float
nsLayoutUtils::FontSizeInflationFor(const nsIFrame *aFrame)
{
if (nsSVGUtils::IsInSVGTextSubtree(aFrame)) {
const nsIFrame* container = aFrame;
while (!container->IsSVGTextFrame()) {
container = container->GetParent();
}
NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
return
static_cast<const SVGTextFrame*>(container)->GetFontSizeScaleFactor();
}
if (!FontSizeInflationEnabled(aFrame->PresContext())) {
return 1.0f;
}
return FontSizeInflationInner(aFrame, InflationMinFontSizeFor(aFrame));
}
/* static */ bool
nsLayoutUtils::FontSizeInflationEnabled(nsPresContext *aPresContext)
{
nsIPresShell* presShell = aPresContext->GetPresShell();
if (!presShell) {
return false;
}
return presShell->FontSizeInflationEnabled();
}
/* static */ nsRect
nsLayoutUtils::GetBoxShadowRectForFrame(nsIFrame* aFrame,
const nsSize& aFrameSize)
{
nsCSSShadowArray* boxShadows = aFrame->StyleEffects()->mBoxShadow;
if (!boxShadows) {
return nsRect();
}
bool nativeTheme;
const nsStyleDisplay* styleDisplay = aFrame->StyleDisplay();
nsITheme::Transparency transparency;
if (aFrame->IsThemed(styleDisplay, &transparency)) {
// For opaque (rectangular) theme widgets we can take the generic
// border-box path with border-radius disabled.
nativeTheme = transparency != nsITheme::eOpaque;
} else {
nativeTheme = false;
}
nsRect frameRect = nativeTheme ?
aFrame->GetVisualOverflowRectRelativeToSelf() :
nsRect(nsPoint(0, 0), aFrameSize);
nsRect shadows;
int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < boxShadows->Length(); ++i) {
nsRect tmpRect = frameRect;
nsCSSShadowItem* shadow = boxShadows->ShadowAt(i);
// inset shadows are never painted outside the frame
if (shadow->mInset)
continue;
tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
tmpRect.Inflate(shadow->mSpread);
tmpRect.Inflate(
nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D));
shadows.UnionRect(shadows, tmpRect);
}
return shadows;
}
/* static */ bool
nsLayoutUtils::GetContentViewerSize(nsPresContext* aPresContext,
LayoutDeviceIntSize& aOutSize)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
if (!cv) {
return false;
}
nsIntRect bounds;
cv->GetBounds(bounds);
aOutSize = LayoutDeviceIntRect::FromUnknownRect(bounds).Size();
return true;
}
static bool
UpdateCompositionBoundsForRCDRSF(ParentLayerRect& aCompBounds,
nsPresContext* aPresContext,
bool aScaleContentViewerSize)
{
nsIFrame* rootFrame = aPresContext->PresShell()->GetRootFrame();
if (!rootFrame) {
return false;
}
#if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_UIKIT)
nsIWidget* widget = rootFrame->GetNearestWidget();
#else
nsView* view = rootFrame->GetView();
nsIWidget* widget = view ? view->GetWidget() : nullptr;
#endif
if (widget) {
LayoutDeviceIntRect widgetBounds = widget->GetBounds();
widgetBounds.MoveTo(0, 0);
aCompBounds = ParentLayerRect(
ViewAs<ParentLayerPixel>(
widgetBounds,
PixelCastJustification::LayoutDeviceIsParentLayerForRCDRSF));
return true;
}
LayoutDeviceIntSize contentSize;
if (nsLayoutUtils::GetContentViewerSize(aPresContext, contentSize)) {
LayoutDeviceToParentLayerScale scale;
if (aScaleContentViewerSize && aPresContext->GetParentPresContext()) {
scale = LayoutDeviceToParentLayerScale(
aPresContext->GetParentPresContext()->PresShell()->GetCumulativeResolution());
}
aCompBounds.SizeTo(contentSize * scale);
return true;
}
return false;
}
/* static */ nsMargin
nsLayoutUtils::ScrollbarAreaToExcludeFromCompositionBoundsFor(nsIFrame* aScrollFrame)
{
if (!aScrollFrame || !aScrollFrame->GetScrollTargetFrame()) {
return nsMargin();
}
nsPresContext* presContext = aScrollFrame->PresContext();
nsIPresShell* presShell = presContext->GetPresShell();
if (!presShell) {
return nsMargin();
}
bool isRootScrollFrame = aScrollFrame == presShell->GetRootScrollFrame();
bool isRootContentDocRootScrollFrame = isRootScrollFrame
&& presContext->IsRootContentDocument();
if (!isRootContentDocRootScrollFrame) {
return nsMargin();
}
if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) {
return nsMargin();
}
nsIScrollableFrame* scrollableFrame = aScrollFrame->GetScrollTargetFrame();
if (!scrollableFrame) {
return nsMargin();
}
return scrollableFrame->GetActualScrollbarSizes();
}
/* static */ nsSize
nsLayoutUtils::CalculateCompositionSizeForFrame(nsIFrame* aFrame, bool aSubtractScrollbars)
{
// If we have a scrollable frame, restrict the composition bounds to its
// scroll port. The scroll port excludes the frame borders and the scroll
// bars, which we don't want to be part of the composition bounds.
nsIScrollableFrame* scrollableFrame = aFrame->GetScrollTargetFrame();
nsRect rect = scrollableFrame ? scrollableFrame->GetScrollPortRect() : aFrame->GetRect();
nsSize size = rect.Size();
nsPresContext* presContext = aFrame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
bool isRootContentDocRootScrollFrame = presContext->IsRootContentDocument()
&& aFrame == presShell->GetRootScrollFrame();
if (isRootContentDocRootScrollFrame) {
ParentLayerRect compBounds;
if (UpdateCompositionBoundsForRCDRSF(compBounds, presContext, false)) {
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
size = nsSize(compBounds.width * auPerDevPixel, compBounds.height * auPerDevPixel);
}
}
if (aSubtractScrollbars) {
nsMargin margins = ScrollbarAreaToExcludeFromCompositionBoundsFor(aFrame);
size.width -= margins.LeftRight();
size.height -= margins.TopBottom();
}
return size;
}
/* static */ CSSSize
nsLayoutUtils::CalculateRootCompositionSize(nsIFrame* aFrame,
bool aIsRootContentDocRootScrollFrame,
const FrameMetrics& aMetrics)
{
if (aIsRootContentDocRootScrollFrame) {
return ViewAs<LayerPixel>(aMetrics.GetCompositionBounds().Size(),
PixelCastJustification::ParentLayerToLayerForRootComposition)
* LayerToScreenScale(1.0f)
/ aMetrics.DisplayportPixelsPerCSSPixel();
}
nsPresContext* presContext = aFrame->PresContext();
ScreenSize rootCompositionSize;
nsPresContext* rootPresContext =
presContext->GetToplevelContentDocumentPresContext();
if (!rootPresContext) {
rootPresContext = presContext->GetRootPresContext();
}
nsIPresShell* rootPresShell = nullptr;
if (rootPresContext) {
rootPresShell = rootPresContext->PresShell();
if (nsIFrame* rootFrame = rootPresShell->GetRootFrame()) {
LayoutDeviceToLayerScale2D cumulativeResolution(
rootPresShell->GetCumulativeResolution()
* nsLayoutUtils::GetTransformToAncestorScale(rootFrame));
ParentLayerRect compBounds;
if (UpdateCompositionBoundsForRCDRSF(compBounds, rootPresContext, true)) {
rootCompositionSize = ViewAs<ScreenPixel>(compBounds.Size(),
PixelCastJustification::ScreenIsParentLayerForRoot);
} else {
int32_t rootAUPerDevPixel = rootPresContext->AppUnitsPerDevPixel();
LayerSize frameSize =
(LayoutDeviceRect::FromAppUnits(rootFrame->GetRect(), rootAUPerDevPixel)
* cumulativeResolution).Size();
rootCompositionSize = frameSize * LayerToScreenScale(1.0f);
}
}
} else {
nsIWidget* widget = aFrame->GetNearestWidget();
LayoutDeviceIntRect widgetBounds = widget->GetBounds();
rootCompositionSize = ScreenSize(
ViewAs<ScreenPixel>(widgetBounds.Size(),
PixelCastJustification::LayoutDeviceIsScreenForBounds));
}
// Adjust composition size for the size of scroll bars.
nsIFrame* rootRootScrollFrame = rootPresShell ? rootPresShell->GetRootScrollFrame() : nullptr;
nsMargin scrollbarMargins = ScrollbarAreaToExcludeFromCompositionBoundsFor(rootRootScrollFrame);
LayoutDeviceMargin margins = LayoutDeviceMargin::FromAppUnits(scrollbarMargins,
rootPresContext->AppUnitsPerDevPixel());
// Scrollbars are not subject to resolution scaling, so LD pixels = layer pixels for them.
rootCompositionSize.width -= margins.LeftRight();
rootCompositionSize.height -= margins.TopBottom();
return rootCompositionSize / aMetrics.DisplayportPixelsPerCSSPixel();
}
/* static */ nsRect
nsLayoutUtils::CalculateScrollableRectForFrame(nsIScrollableFrame* aScrollableFrame, nsIFrame* aRootFrame)
{
nsRect contentBounds;
if (aScrollableFrame) {
contentBounds = aScrollableFrame->GetScrollRange();
nsPoint scrollPosition = aScrollableFrame->GetScrollPosition();
if (aScrollableFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
contentBounds.y = scrollPosition.y;
contentBounds.height = 0;
}
if (aScrollableFrame->GetScrollbarStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
contentBounds.x = scrollPosition.x;
contentBounds.width = 0;
}
contentBounds.width += aScrollableFrame->GetScrollPortRect().width;
contentBounds.height += aScrollableFrame->GetScrollPortRect().height;
} else {
contentBounds = aRootFrame->GetRect();
}
return contentBounds;
}
/* static */ nsRect
nsLayoutUtils::CalculateExpandedScrollableRect(nsIFrame* aFrame)
{
nsRect scrollableRect =
CalculateScrollableRectForFrame(aFrame->GetScrollTargetFrame(),
aFrame->PresShell()->GetRootFrame());
nsSize compSize = CalculateCompositionSizeForFrame(aFrame);
if (aFrame == aFrame->PresShell()->GetRootScrollFrame()) {
// the composition size for the root scroll frame does not include the
// local resolution, so we adjust.
float res = aFrame->PresShell()->GetResolution();
compSize.width = NSToCoordRound(compSize.width / res);
compSize.height = NSToCoordRound(compSize.height / res);
}
if (scrollableRect.width < compSize.width) {
scrollableRect.x = std::max(0,
scrollableRect.x - (compSize.width - scrollableRect.width));
scrollableRect.width = compSize.width;
}
if (scrollableRect.height < compSize.height) {
scrollableRect.y = std::max(0,
scrollableRect.y - (compSize.height - scrollableRect.height));
scrollableRect.height = compSize.height;
}
return scrollableRect;
}
/* static */ void
nsLayoutUtils::DoLogTestDataForPaint(LayerManager* aManager,
ViewID aScrollId,
const std::string& aKey,
const std::string& aValue)
{
MOZ_ASSERT(nsLayoutUtils::IsAPZTestLoggingEnabled(), "don't call me");
if (ClientLayerManager* mgr = aManager->AsClientLayerManager()) {
mgr->LogTestDataForCurrentPaint(aScrollId, aKey, aValue);
} else if (WebRenderLayerManager* wrlm = aManager->AsWebRenderLayerManager()) {
wrlm->LogTestDataForCurrentPaint(aScrollId, aKey, aValue);
}
}
/* static */ bool
nsLayoutUtils::IsAPZTestLoggingEnabled()
{
return gfxPrefs::APZTestLoggingEnabled();
}
////////////////////////////////////////
// SurfaceFromElementResult
nsLayoutUtils::SurfaceFromElementResult::SurfaceFromElementResult()
// Use safe default values here
: mIsWriteOnly(true)
, mIsStillLoading(false)
, mHasSize(false)
, mCORSUsed(false)
, mAlphaType(gfxAlphaType::Opaque)
{
}
const RefPtr<mozilla::gfx::SourceSurface>&
nsLayoutUtils::SurfaceFromElementResult::GetSourceSurface()
{
if (!mSourceSurface && mLayersImage) {
mSourceSurface = mLayersImage->GetAsSourceSurface();
}
return mSourceSurface;
}
////////////////////////////////////////
bool
nsLayoutUtils::IsNonWrapperBlock(nsIFrame* aFrame)
{
return GetAsBlock(aFrame) && !aFrame->IsBlockWrapper();
}
bool
nsLayoutUtils::NeedsPrintPreviewBackground(nsPresContext* aPresContext)
{
return aPresContext->IsRootPaginatedDocument() &&
(aPresContext->Type() == nsPresContext::eContext_PrintPreview ||
aPresContext->Type() == nsPresContext::eContext_PageLayout);
}
AutoMaybeDisableFontInflation::AutoMaybeDisableFontInflation(nsIFrame *aFrame)
{
// FIXME: Now that inflation calculations are based on the flow
// root's NCA's (nearest common ancestor of its inflatable
// descendants) width, we could probably disable inflation in
// fewer cases than we currently do.
// MathML cells need special treatment. See bug 1002526 comment 56.
if (aFrame->IsContainerForFontSizeInflation() &&
!aFrame->IsFrameOfType(nsIFrame::eMathML)) {
mPresContext = aFrame->PresContext();
mOldValue = mPresContext->mInflationDisabledForShrinkWrap;
mPresContext->mInflationDisabledForShrinkWrap = true;
} else {
// indicate we have nothing to restore
mPresContext = nullptr;
}
}
AutoMaybeDisableFontInflation::~AutoMaybeDisableFontInflation()
{
if (mPresContext) {
mPresContext->mInflationDisabledForShrinkWrap = mOldValue;
}
}
namespace mozilla {
Rect NSRectToRect(const nsRect& aRect, double aAppUnitsPerPixel)
{
// Note that by making aAppUnitsPerPixel a double we're doing floating-point
// division using a larger type and avoiding rounding error.
return Rect(Float(aRect.x / aAppUnitsPerPixel),
Float(aRect.y / aAppUnitsPerPixel),
Float(aRect.width / aAppUnitsPerPixel),
Float(aRect.height / aAppUnitsPerPixel));
}
Rect NSRectToSnappedRect(const nsRect& aRect, double aAppUnitsPerPixel,
const gfx::DrawTarget& aSnapDT)
{
// Note that by making aAppUnitsPerPixel a double we're doing floating-point
// division using a larger type and avoiding rounding error.
Rect rect(Float(aRect.x / aAppUnitsPerPixel),
Float(aRect.y / aAppUnitsPerPixel),
Float(aRect.width / aAppUnitsPerPixel),
Float(aRect.height / aAppUnitsPerPixel));
MaybeSnapToDevicePixels(rect, aSnapDT, true);
return rect;
}
// Similar to a snapped rect, except an axis is left unsnapped if the snapping
// process results in a length of 0.
Rect NSRectToNonEmptySnappedRect(const nsRect& aRect, double aAppUnitsPerPixel,
const gfx::DrawTarget& aSnapDT)
{
// Note that by making aAppUnitsPerPixel a double we're doing floating-point
// division using a larger type and avoiding rounding error.
Rect rect(Float(aRect.x / aAppUnitsPerPixel),
Float(aRect.y / aAppUnitsPerPixel),
Float(aRect.width / aAppUnitsPerPixel),
Float(aRect.height / aAppUnitsPerPixel));
MaybeSnapToDevicePixels(rect, aSnapDT, true, false);
return rect;
}
void StrokeLineWithSnapping(const nsPoint& aP1, const nsPoint& aP2,
int32_t aAppUnitsPerDevPixel,
DrawTarget& aDrawTarget,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aDrawOptions)
{
Point p1 = NSPointToPoint(aP1, aAppUnitsPerDevPixel);
Point p2 = NSPointToPoint(aP2, aAppUnitsPerDevPixel);
SnapLineToDevicePixelsForStroking(p1, p2, aDrawTarget,
aStrokeOptions.mLineWidth);
aDrawTarget.StrokeLine(p1, p2, aPattern, aStrokeOptions, aDrawOptions);
}
namespace layout {
void
MaybeSetupTransactionIdAllocator(layers::LayerManager* aManager,
nsPresContext* aPresContext)
{
auto backendType = aManager->GetBackendType();
if (backendType == LayersBackend::LAYERS_CLIENT ||
backendType == LayersBackend::LAYERS_WR) {
aManager->SetTransactionIdAllocator(aPresContext->RefreshDriver());
}
}
} // namespace layout
} // namespace mozilla
/* static */ bool
nsLayoutUtils::IsOutlineStyleAutoEnabled()
{
static bool sOutlineStyleAutoEnabled;
static bool sOutlineStyleAutoPrefCached = false;
if (!sOutlineStyleAutoPrefCached) {
sOutlineStyleAutoPrefCached = true;
Preferences::AddBoolVarCache(&sOutlineStyleAutoEnabled,
"layout.css.outline-style-auto.enabled",
false);
}
return sOutlineStyleAutoEnabled;
}
/* static */ void
nsLayoutUtils::SetBSizeFromFontMetrics(const nsIFrame* aFrame,
ReflowOutput& aMetrics,
const LogicalMargin& aFramePadding,
WritingMode aLineWM,
WritingMode aFrameWM)
{
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
if (fm) {
// Compute final height of the frame.
//
// Do things the standard css2 way -- though it's hard to find it
// in the css2 spec! It's actually found in the css1 spec section
// 4.4 (you will have to read between the lines to really see
// it).
//
// The height of our box is the sum of our font size plus the top
// and bottom border and padding. The height of children do not
// affect our height.
aMetrics.SetBlockStartAscent(aLineWM.IsLineInverted() ? fm->MaxDescent()
: fm->MaxAscent());
aMetrics.BSize(aLineWM) = fm->MaxHeight();
} else {
NS_WARNING("Cannot get font metrics - defaulting sizes to 0");
aMetrics.SetBlockStartAscent(aMetrics.BSize(aLineWM) = 0);
}
aMetrics.SetBlockStartAscent(aMetrics.BlockStartAscent() +
aFramePadding.BStart(aFrameWM));
aMetrics.BSize(aLineWM) += aFramePadding.BStartEnd(aFrameWM);
}
/* static */ bool
nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(nsIPresShell* aShell)
{
if (nsIDocument* doc = aShell->GetDocument()) {
WidgetEvent event(true, eVoidEvent);
nsTArray<EventTarget*> targets;
nsresult rv = EventDispatcher::Dispatch(doc, nullptr, &event, nullptr,
nullptr, nullptr, &targets);
NS_ENSURE_SUCCESS(rv, false);
for (size_t i = 0; i < targets.Length(); i++) {
if (targets[i]->IsApzAware()) {
return true;
}
}
}
return false;
}
static void
MaybeReflowForInflationScreenSizeChange(nsPresContext *aPresContext)
{
if (aPresContext) {
nsIPresShell* presShell = aPresContext->GetPresShell();
const bool fontInflationWasEnabled = presShell->FontSizeInflationEnabled();
presShell->RecomputeFontSizeInflationEnabled();
bool changed = false;
if (presShell->FontSizeInflationEnabled() &&
presShell->FontSizeInflationMinTwips() != 0) {
aPresContext->ScreenSizeInchesForFontInflation(&changed);
}
changed = changed ||
fontInflationWasEnabled != presShell->FontSizeInflationEnabled();
if (changed) {
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
if (cv) {
nsTArray<nsCOMPtr<nsIContentViewer> > array;
cv->AppendSubtree(array);
for (uint32_t i = 0, iEnd = array.Length(); i < iEnd; ++i) {
nsCOMPtr<nsIPresShell> shell;
nsCOMPtr<nsIContentViewer> cv = array[i];
cv->GetPresShell(getter_AddRefs(shell));
if (shell) {
nsIFrame *rootFrame = shell->GetRootFrame();
if (rootFrame) {
shell->FrameNeedsReflow(rootFrame,
nsIPresShell::eStyleChange,
NS_FRAME_IS_DIRTY);
}
}
}
}
}
}
}
}
/* static */ void
nsLayoutUtils::SetScrollPositionClampingScrollPortSize(nsIPresShell* aPresShell, CSSSize aSize)
{
MOZ_ASSERT(aSize.width >= 0.0 && aSize.height >= 0.0);
aPresShell->SetScrollPositionClampingScrollPortSize(
nsPresContext::CSSPixelsToAppUnits(aSize.width),
nsPresContext::CSSPixelsToAppUnits(aSize.height));
// When the "font.size.inflation.minTwips" preference is set, the
// layout depends on the size of the screen. Since when the size
// of the screen changes, the scroll position clamping scroll port
// size also changes, we hook in the needed updates here rather
// than adding a separate notification just for this change.
nsPresContext* presContext = aPresShell->GetPresContext();
MaybeReflowForInflationScreenSizeChange(presContext);
}
/* static */ bool
nsLayoutUtils::CanScrollOriginClobberApz(nsAtom* aScrollOrigin)
{
return aScrollOrigin != nullptr
&& aScrollOrigin != nsGkAtoms::apz
&& aScrollOrigin != nsGkAtoms::restore;
}
/* static */ ScrollMetadata
nsLayoutUtils::ComputeScrollMetadata(nsIFrame* aForFrame,
nsIFrame* aScrollFrame,
nsIContent* aContent,
const nsIFrame* aReferenceFrame,
LayerManager* aLayerManager,
ViewID aScrollParentId,
const nsRect& aViewport,
const Maybe<nsRect>& aClipRect,
bool aIsRootContent,
const ContainerLayerParameters& aContainerParameters)
{
nsPresContext* presContext = aForFrame->PresContext();
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
nsIPresShell* presShell = presContext->GetPresShell();
ScrollMetadata metadata;
FrameMetrics& metrics = metadata.GetMetrics();
metrics.SetViewport(CSSRect::FromAppUnits(aViewport));
ViewID scrollId = FrameMetrics::NULL_SCROLL_ID;
if (aContent) {
if (void* paintRequestTime = aContent->GetProperty(nsGkAtoms::paintRequestTime)) {
metrics.SetPaintRequestTime(*static_cast<TimeStamp*>(paintRequestTime));
aContent->DeleteProperty(nsGkAtoms::paintRequestTime);
}
scrollId = nsLayoutUtils::FindOrCreateIDFor(aContent);
nsRect dp;
if (nsLayoutUtils::GetDisplayPort(aContent, &dp)) {
metrics.SetDisplayPort(CSSRect::FromAppUnits(dp));
if (IsAPZTestLoggingEnabled()) {
LogTestDataForPaint(aLayerManager, scrollId, "displayport",
metrics.GetDisplayPort());
}
}
if (nsLayoutUtils::GetCriticalDisplayPort(aContent, &dp)) {
metrics.SetCriticalDisplayPort(CSSRect::FromAppUnits(dp));
if (IsAPZTestLoggingEnabled()) {
LogTestDataForPaint(aLayerManager, scrollId, "criticalDisplayport",
metrics.GetCriticalDisplayPort());
}
}
DisplayPortMarginsPropertyData* marginsData =
static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
if (marginsData) {
metrics.SetDisplayPortMargins(marginsData->mMargins);
}
}
nsIScrollableFrame* scrollableFrame = nullptr;
if (aScrollFrame)
scrollableFrame = aScrollFrame->GetScrollTargetFrame();
metrics.SetScrollableRect(CSSRect::FromAppUnits(
nsLayoutUtils::CalculateScrollableRectForFrame(scrollableFrame, aForFrame)));
if (scrollableFrame) {
nsPoint scrollPosition = scrollableFrame->GetScrollPosition();
metrics.SetScrollOffset(CSSPoint::FromAppUnits(scrollPosition));
nsPoint smoothScrollPosition = scrollableFrame->LastScrollDestination();
metrics.SetSmoothScrollOffset(CSSPoint::FromAppUnits(smoothScrollPosition));
// If the frame was scrolled since the last layers update, and by something
// that is higher priority than APZ, we want to tell the APZ to update
// its scroll offset. We want to distinguish the case where the scroll offset
// was "restored" because in that case the restored scroll position should
// not overwrite a user-driven scroll.
if (scrollableFrame->LastScrollOrigin() == nsGkAtoms::restore) {
metrics.SetScrollOffsetRestored(scrollableFrame->CurrentScrollGeneration());
} else if (CanScrollOriginClobberApz(scrollableFrame->LastScrollOrigin())) {
metrics.SetScrollOffsetUpdated(scrollableFrame->CurrentScrollGeneration());
}
scrollableFrame->AllowScrollOriginDowngrade();
nsAtom* lastSmoothScrollOrigin = scrollableFrame->LastSmoothScrollOrigin();
if (lastSmoothScrollOrigin) {
metrics.SetSmoothScrollOffsetUpdated(scrollableFrame->CurrentScrollGeneration());
}
nsSize lineScrollAmount = scrollableFrame->GetLineScrollAmount();
LayoutDeviceIntSize lineScrollAmountInDevPixels =
LayoutDeviceIntSize::FromAppUnitsRounded(lineScrollAmount, presContext->AppUnitsPerDevPixel());
metadata.SetLineScrollAmount(lineScrollAmountInDevPixels);
nsSize pageScrollAmount = scrollableFrame->GetPageScrollAmount();
LayoutDeviceIntSize pageScrollAmountInDevPixels =
LayoutDeviceIntSize::FromAppUnitsRounded(pageScrollAmount, presContext->AppUnitsPerDevPixel());
metadata.SetPageScrollAmount(pageScrollAmountInDevPixels);
if (!aScrollFrame->GetParent() ||
EventStateManager::CanVerticallyScrollFrameWithWheel(aScrollFrame->GetParent()))
{
metadata.SetAllowVerticalScrollWithWheel(true);
}
metadata.SetUsesContainerScrolling(scrollableFrame->UsesContainerScrolling());
metadata.SetSnapInfo(scrollableFrame->GetScrollSnapInfo());
ScrollbarStyles scrollbarStyles = scrollableFrame->GetScrollbarStyles();
metadata.SetOverscrollBehavior(OverscrollBehaviorInfo::FromStyleConstants(
scrollbarStyles.mOverscrollBehaviorX,
scrollbarStyles.mOverscrollBehaviorY));
}
// If we have the scrollparent being the same as the scroll id, the
// compositor-side code could get into an infinite loop while building the
// overscroll handoff chain.
MOZ_ASSERT(aScrollParentId == FrameMetrics::NULL_SCROLL_ID || scrollId != aScrollParentId);
metrics.SetScrollId(scrollId);
metrics.SetIsRootContent(aIsRootContent);
metadata.SetScrollParentId(aScrollParentId);
if (scrollId != FrameMetrics::NULL_SCROLL_ID && !presContext->GetParentPresContext()) {
if ((aScrollFrame && (aScrollFrame == presShell->GetRootScrollFrame())) ||
aContent == presShell->GetDocument()->GetDocumentElement()) {
metadata.SetIsLayersIdRoot(true);
}
}
// Only the root scrollable frame for a given presShell should pick up
// the presShell's resolution. All the other frames are 1.0.
if (aScrollFrame == presShell->GetRootScrollFrame()) {
metrics.SetPresShellResolution(presShell->GetResolution());
} else {
metrics.SetPresShellResolution(1.0f);
}
// The cumulative resolution is the resolution at which the scroll frame's
// content is actually rendered. It includes the pres shell resolutions of
// all the pres shells from here up to the root, as well as any css-driven
// resolution. We don't need to compute it as it's already stored in the
// container parameters.
metrics.SetCumulativeResolution(aContainerParameters.Scale());
LayoutDeviceToScreenScale2D resolutionToScreen(
presShell->GetCumulativeResolution()
* nsLayoutUtils::GetTransformToAncestorScale(aScrollFrame ? aScrollFrame : aForFrame));
metrics.SetExtraResolution(metrics.GetCumulativeResolution() / resolutionToScreen);
metrics.SetDevPixelsPerCSSPixel(presContext->CSSToDevPixelScale());
// Initially, AsyncPanZoomController should render the content to the screen
// at the painted resolution.
const LayerToParentLayerScale layerToParentLayerScale(1.0f);
metrics.SetZoom(metrics.GetCumulativeResolution() * metrics.GetDevPixelsPerCSSPixel()
* layerToParentLayerScale);
// Calculate the composition bounds as the size of the scroll frame and
// its origin relative to the reference frame.
// If aScrollFrame is null, we are in a document without a root scroll frame,
// so it's a xul document. In this case, use the size of the viewport frame.
nsIFrame* frameForCompositionBoundsCalculation = aScrollFrame ? aScrollFrame : aForFrame;
nsRect compositionBounds(frameForCompositionBoundsCalculation->GetOffsetToCrossDoc(aReferenceFrame),
frameForCompositionBoundsCalculation->GetSize());
if (scrollableFrame) {
// If we have a scrollable frame, restrict the composition bounds to its
// scroll port. The scroll port excludes the frame borders and the scroll
// bars, which we don't want to be part of the composition bounds.
nsRect scrollPort = scrollableFrame->GetScrollPortRect();
compositionBounds = nsRect(compositionBounds.TopLeft() + scrollPort.TopLeft(),
scrollPort.Size());
}
ParentLayerRect frameBounds = LayoutDeviceRect::FromAppUnits(compositionBounds, auPerDevPixel)
* metrics.GetCumulativeResolution()
* layerToParentLayerScale;
if (aClipRect) {
ParentLayerRect rect = LayoutDeviceRect::FromAppUnits(*aClipRect, auPerDevPixel)
* metrics.GetCumulativeResolution()
* layerToParentLayerScale;
metadata.SetScrollClip(Some(LayerClip(RoundedToInt(rect))));
}
// For the root scroll frame of the root content document (RCD-RSF), the above calculation
// will yield the size of the viewport frame as the composition bounds, which
// doesn't actually correspond to what is visible when
// nsIDOMWindowUtils::setCSSViewport has been called to modify the visible area of
// the prescontext that the viewport frame is reflowed into. In that case if our
// document has a widget then the widget's bounds will correspond to what is
// visible. If we don't have a widget the root view's bounds correspond to what
// would be visible because they don't get modified by setCSSViewport.
bool isRootScrollFrame = aScrollFrame == presShell->GetRootScrollFrame();
bool isRootContentDocRootScrollFrame = isRootScrollFrame
&& presContext->IsRootContentDocument();
if (isRootContentDocRootScrollFrame) {
UpdateCompositionBoundsForRCDRSF(frameBounds, presContext, true);
}
nsMargin sizes = ScrollbarAreaToExcludeFromCompositionBoundsFor(aScrollFrame);
// Scrollbars are not subject to resolution scaling, so LD pixels = layer pixels for them.
ParentLayerMargin boundMargins = LayoutDeviceMargin::FromAppUnits(sizes, auPerDevPixel)
* LayoutDeviceToParentLayerScale(1.0f);
frameBounds.Deflate(boundMargins);
metrics.SetCompositionBounds(frameBounds);
metrics.SetRootCompositionSize(
nsLayoutUtils::CalculateRootCompositionSize(aScrollFrame ? aScrollFrame : aForFrame,
isRootContentDocRootScrollFrame, metrics));
if (gfxPrefs::APZPrintTree() || gfxPrefs::APZTestLoggingEnabled()) {
if (nsIContent* content = frameForCompositionBoundsCalculation->GetContent()) {
nsAutoString contentDescription;
content->Describe(contentDescription);
metadata.SetContentDescription(NS_LossyConvertUTF16toASCII(contentDescription));
if (IsAPZTestLoggingEnabled()) {
LogTestDataForPaint(aLayerManager, scrollId, "contentDescription",
metadata.GetContentDescription().get());
}
}
}
metrics.SetPresShellId(presShell->GetPresShellId());
// If the scroll frame's content is marked 'scrollgrab', record this
// in the FrameMetrics so APZ knows to provide the scroll grabbing
// behaviour.
if (aScrollFrame && nsContentUtils::HasScrollgrab(aScrollFrame->GetContent())) {
metadata.SetHasScrollgrab(true);
}
// Also compute and set the background color.
// This is needed for APZ overscrolling support.
if (aScrollFrame) {
if (isRootScrollFrame) {
metadata.SetBackgroundColor(Color::FromABGR(
presShell->GetCanvasBackground()));
} else {
nsStyleContext* backgroundStyle;
if (nsCSSRendering::FindBackground(aScrollFrame, &backgroundStyle)) {
nscolor backgroundColor = backgroundStyle->
StyleBackground()->BackgroundColor(backgroundStyle);
metadata.SetBackgroundColor(Color::FromABGR(backgroundColor));
}
}
}
if (ShouldDisableApzForElement(aContent)) {
metadata.SetForceDisableApz(true);
}
return metadata;
}
/*static*/ Maybe<ScrollMetadata>
nsLayoutUtils::GetRootMetadata(nsDisplayListBuilder* aBuilder,
LayerManager* aLayerManager,
const ContainerLayerParameters& aContainerParameters,
const std::function<bool(ViewID& aScrollId)>& aCallback)
{
nsIFrame* frame = aBuilder->RootReferenceFrame();
nsPresContext* presContext = frame->PresContext();
nsIPresShell* presShell = presContext->PresShell();
nsIDocument* document = presShell->GetDocument();
// If we're using containerless scrolling, there is still one case where we
// want the root container layer to have metrics. If the parent process is
// using XUL windows, there is no root scrollframe, and without explicitly
// creating metrics there will be no guaranteed top-level APZC.
bool addMetrics = gfxPrefs::LayoutUseContainersForRootFrames() ||
(XRE_IsParentProcess() && !presShell->GetRootScrollFrame());
// Add metrics if there are none in the layer tree with the id (create an id
// if there isn't one already) of the root scroll frame/root content.
bool ensureMetricsForRootId =
nsLayoutUtils::AsyncPanZoomEnabled(frame) &&
!gfxPrefs::LayoutUseContainersForRootFrames() &&
aBuilder->IsPaintingToWindow() &&
!presContext->GetParentPresContext();
nsIContent* content = nullptr;
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
if (rootScrollFrame) {
content = rootScrollFrame->GetContent();
} else {
// If there is no root scroll frame, pick the document element instead.
// The only case we don't want to do this is in non-APZ fennec, where
// we want the root xul document to get a null scroll id so that the root
// content document gets the first non-null scroll id.
content = document->GetDocumentElement();
}
if (ensureMetricsForRootId && content) {
ViewID scrollId = nsLayoutUtils::FindOrCreateIDFor(content);
if (aCallback(scrollId)) {
ensureMetricsForRootId = false;
}
}
if (addMetrics || ensureMetricsForRootId) {
bool isRootContent = presContext->IsRootContentDocument();
nsRect viewport(aBuilder->ToReferenceFrame(frame), frame->GetSize());
return Some(nsLayoutUtils::ComputeScrollMetadata(frame,
rootScrollFrame, content,
aBuilder->FindReferenceFrameFor(frame),
aLayerManager, FrameMetrics::NULL_SCROLL_ID, viewport, Nothing(),
isRootContent, aContainerParameters));
}
return Nothing();
}
/* static */ bool
nsLayoutUtils::ContainsMetricsWithId(const Layer* aLayer, const ViewID& aScrollId)
{
for (uint32_t i = aLayer->GetScrollMetadataCount(); i > 0; i--) {
if (aLayer->GetFrameMetrics(i-1).GetScrollId() == aScrollId) {
return true;
}
}
for (Layer* child = aLayer->GetFirstChild(); child; child = child->GetNextSibling()) {
if (ContainsMetricsWithId(child, aScrollId)) {
return true;
}
}
return false;
}
/* static */ uint32_t
nsLayoutUtils::GetTouchActionFromFrame(nsIFrame* aFrame)
{
// If aFrame is null then return default value
if (!aFrame) {
return NS_STYLE_TOUCH_ACTION_AUTO;
}
// The touch-action CSS property applies to: all elements except:
// non-replaced inline elements, table rows, row groups, table columns, and column groups
bool isNonReplacedInlineElement = aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
if (isNonReplacedInlineElement) {
return NS_STYLE_TOUCH_ACTION_AUTO;
}
const nsStyleDisplay* disp = aFrame->StyleDisplay();
bool isTableElement = disp->IsInnerTableStyle() &&
disp->mDisplay != StyleDisplay::TableCell &&
disp->mDisplay != StyleDisplay::TableCaption;
if (isTableElement) {
return NS_STYLE_TOUCH_ACTION_AUTO;
}
return disp->mTouchAction;
}
/* static */ void
nsLayoutUtils::TransformToAncestorAndCombineRegions(
const nsRegion& aRegion,
nsIFrame* aFrame,
const nsIFrame* aAncestorFrame,
nsRegion* aPreciseTargetDest,
nsRegion* aImpreciseTargetDest,
Maybe<Matrix4x4>* aMatrixCache,
const DisplayItemClip* aClip)
{
if (aRegion.IsEmpty()) {
return;
}
bool isPrecise;
RegionBuilder<nsRegion> transformedRegion;
for (nsRegion::RectIterator it = aRegion.RectIter(); !it.Done(); it.Next()) {
nsRect transformed = TransformFrameRectToAncestor(
aFrame, it.Get(), aAncestorFrame, &isPrecise, aMatrixCache);
if (aClip) {
transformed = aClip->ApplyNonRoundedIntersection(transformed);
if (aClip->GetRoundedRectCount() > 0) {
isPrecise = false;
}
}
transformedRegion.OrWith(transformed);
}
nsRegion* dest = isPrecise ? aPreciseTargetDest : aImpreciseTargetDest;
dest->OrWith(transformedRegion.ToRegion());
}
/* static */ bool
nsLayoutUtils::ShouldUseNoScriptSheet(nsIDocument* aDocument)
{
// also handle the case where print is done from print preview
// see bug #342439 for more details
if (aDocument->IsStaticDocument()) {
aDocument = aDocument->GetOriginalDocument();
}
return aDocument->IsScriptEnabled();
}
/* static */ bool
nsLayoutUtils::ShouldUseNoFramesSheet(nsIDocument* aDocument)
{
bool allowSubframes = true;
nsIDocShell* docShell = aDocument->GetDocShell();
if (docShell) {
docShell->GetAllowSubframes(&allowSubframes);
}
return !allowSubframes;
}
/* static */ void
nsLayoutUtils::GetFrameTextContent(nsIFrame* aFrame, nsAString& aResult)
{
aResult.Truncate();
AppendFrameTextContent(aFrame, aResult);
}
/* static */ void
nsLayoutUtils::AppendFrameTextContent(nsIFrame* aFrame, nsAString& aResult)
{
if (aFrame->IsTextFrame()) {
auto textFrame = static_cast<nsTextFrame*>(aFrame);
auto offset = textFrame->GetContentOffset();
auto length = textFrame->GetContentLength();
textFrame->GetContent()->
GetText()->AppendTo(aResult, offset, length);
} else {
for (nsIFrame* child : aFrame->PrincipalChildList()) {
AppendFrameTextContent(child, aResult);
}
}
}
/* static */
nsRect
nsLayoutUtils::GetSelectionBoundingRect(Selection* aSel)
{
nsRect res;
// Bounding client rect may be empty after calling GetBoundingClientRect
// when range is collapsed. So we get caret's rect when range is
// collapsed.
if (aSel->IsCollapsed()) {
nsIFrame* frame = nsCaret::GetGeometry(aSel, &res);
if (frame) {
nsIFrame* relativeTo = GetContainingBlockForClientRect(frame);
res = TransformFrameRectToAncestor(frame, res, relativeTo);
}
} else {
int32_t rangeCount = aSel->RangeCount();
RectAccumulator accumulator;
for (int32_t idx = 0; idx < rangeCount; ++idx) {
nsRange* range = aSel->GetRangeAt(idx);
nsRange::CollectClientRectsAndText(&accumulator, nullptr, range,
range->GetStartContainer(),
range->StartOffset(),
range->GetEndContainer(),
range->EndOffset(),
true, false);
}
res = accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect :
accumulator.mResultRect;
}
return res;
}
/* static */ nsBlockFrame*
nsLayoutUtils::GetFloatContainingBlock(nsIFrame* aFrame)
{
nsIFrame* ancestor = aFrame->GetParent();
while (ancestor && !ancestor->IsFloatContainingBlock()) {
ancestor = ancestor->GetParent();
}
MOZ_ASSERT(!ancestor || GetAsBlock(ancestor),
"Float containing block can only be block frame");
return static_cast<nsBlockFrame*>(ancestor);
}
// The implementation of this calculation is adapted from
// Element::GetBoundingClientRect().
/* static */ CSSRect
nsLayoutUtils::GetBoundingContentRect(const nsIContent* aContent,
const nsIScrollableFrame* aRootScrollFrame) {
CSSRect result;
if (nsIFrame* frame = aContent->GetPrimaryFrame()) {
nsIFrame* relativeTo = aRootScrollFrame->GetScrolledFrame();
result = CSSRect::FromAppUnits(
nsLayoutUtils::GetAllInFlowRectsUnion(
frame,
relativeTo,
nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS));
// If the element is contained in a scrollable frame that is not
// the root scroll frame, make sure to clip the result so that it is
// not larger than the containing scrollable frame's bounds.
nsIScrollableFrame* scrollFrame = nsLayoutUtils::GetNearestScrollableFrame(frame);
if (scrollFrame && scrollFrame != aRootScrollFrame) {
nsIFrame* subFrame = do_QueryFrame(scrollFrame);
MOZ_ASSERT(subFrame);
// Get the bounds of the scroll frame in the same coordinate space
// as |result|.
CSSRect subFrameRect = CSSRect::FromAppUnits(
nsLayoutUtils::TransformFrameRectToAncestor(
subFrame,
subFrame->GetRectRelativeToSelf(),
relativeTo));
result = subFrameRect.Intersect(result);
}
}
return result;
}
static already_AddRefed<nsIPresShell>
GetPresShell(const nsIContent* aContent)
{
nsCOMPtr<nsIPresShell> result;
if (nsIDocument* doc = aContent->GetComposedDoc()) {
result = doc->GetShell();
}
return result.forget();
}
static void UpdateDisplayPortMarginsForPendingMetrics(FrameMetrics& aMetrics) {
nsIContent* content = nsLayoutUtils::FindContentFor(aMetrics.GetScrollId());
if (!content) {
return;
}
nsCOMPtr<nsIPresShell> shell = GetPresShell(content);
if (!shell) {
return;
}
MOZ_ASSERT(aMetrics.GetUseDisplayPortMargins());
if (gfxPrefs::APZAllowZooming() && aMetrics.IsRootContent()) {
// See APZCCallbackHelper::UpdateRootFrame for details.
float presShellResolution = shell->GetResolution();
if (presShellResolution != aMetrics.GetPresShellResolution()) {
return;
}
}
nsIScrollableFrame* frame = nsLayoutUtils::FindScrollableFrameFor(aMetrics.GetScrollId());
if (!frame) {
return;
}
if (APZCCallbackHelper::IsScrollInProgress(frame)) {
// If these conditions are true, then the UpdateFrame
// message may be ignored by the main-thread, so we
// shouldn't update the displayport based on it.
return;
}
DisplayPortMarginsPropertyData* currentData =
static_cast<DisplayPortMarginsPropertyData*>(content->GetProperty(nsGkAtoms::DisplayPortMargins));
if (!currentData) {
return;
}
CSSPoint frameScrollOffset = CSSPoint::FromAppUnits(frame->GetScrollPosition());
APZCCallbackHelper::AdjustDisplayPortForScrollDelta(aMetrics, frameScrollOffset);
nsLayoutUtils::SetDisplayPortMargins(content, shell,
aMetrics.GetDisplayPortMargins(), 0);
}
/* static */ void
nsLayoutUtils::UpdateDisplayPortMarginsFromPendingMessages()
{
if (XRE_IsContentProcess() &&
mozilla::layers::CompositorBridgeChild::Get() &&
mozilla::layers::CompositorBridgeChild::Get()->GetIPCChannel()) {
CompositorBridgeChild::Get()->GetIPCChannel()->PeekMessages(
[](const IPC::Message& aMsg) -> bool {
if (aMsg.type() == mozilla::layers::PAPZ::Msg_RequestContentRepaint__ID) {
PickleIterator iter(aMsg);
FrameMetrics frame;
if (!IPC::ReadParam(&aMsg, &iter, &frame)) {
MOZ_ASSERT(false);
return true;
}
UpdateDisplayPortMarginsForPendingMetrics(frame);
}
return true;
});
}
}
/* static */ bool
nsLayoutUtils::IsTransformed(nsIFrame* aForFrame, nsIFrame* aTopFrame)
{
for (nsIFrame* f = aForFrame; f != aTopFrame; f = f->GetParent()) {
if (f->IsTransformed()) {
return true;
}
}
return false;
}
/*static*/ CSSPoint
nsLayoutUtils::GetCumulativeApzCallbackTransform(nsIFrame* aFrame)
{
CSSPoint delta;
if (!aFrame) {
return delta;
}
nsIFrame* frame = aFrame;
nsCOMPtr<nsIContent> content = frame->GetContent();
nsCOMPtr<nsIContent> lastContent;
while (frame) {
if (content && (content != lastContent)) {
void* property = content->GetProperty(nsGkAtoms::apzCallbackTransform);
if (property) {
delta += *static_cast<CSSPoint*>(property);
}
}
frame = GetCrossDocParentFrame(frame);
lastContent = content;
content = frame ? frame->GetContent() : nullptr;
}
return delta;
}
/* static */ nsRect
nsLayoutUtils::ComputePartialPrerenderArea(const nsRect& aDirtyRect,
const nsRect& aOverflow,
const nsSize& aPrerenderSize)
{
// Simple calculation for now: center the pre-render area on the dirty rect,
// and clamp to the overflow area. Later we can do more advanced things like
// redistributing from one axis to another, or from one side to another.
nscoord xExcess = std::max(aPrerenderSize.width - aDirtyRect.width, 0);
nscoord yExcess = std::max(aPrerenderSize.height - aDirtyRect.height, 0);
nsRect result = aDirtyRect;
result.Inflate(xExcess / 2, yExcess / 2);
return result.MoveInsideAndClamp(aOverflow);
}
static
bool
LineHasNonEmptyContentWorker(nsIFrame* aFrame)
{
// Look for non-empty frames, but ignore inline and br frames.
// For inline frames, descend into the children, if any.
if (aFrame->IsInlineFrame()) {
for (nsIFrame* child : aFrame->PrincipalChildList()) {
if (LineHasNonEmptyContentWorker(child)) {
return true;
}
}
} else {
if (!aFrame->IsBrFrame() && !aFrame->IsEmpty()) {
return true;
}
}
return false;
}
static
bool
LineHasNonEmptyContent(nsLineBox* aLine)
{
int32_t count = aLine->GetChildCount();
for (nsIFrame* frame = aLine->mFirstChild; count > 0;
--count, frame = frame->GetNextSibling()) {
if (LineHasNonEmptyContentWorker(frame)) {
return true;
}
}
return false;
}
/* static */ bool
nsLayoutUtils::IsInvisibleBreak(nsINode* aNode, nsIFrame** aNextLineFrame)
{
if (aNextLineFrame) {
*aNextLineFrame = nullptr;
}
if (!aNode->IsElement() || !aNode->IsEditable()) {
return false;
}
nsIFrame* frame = aNode->AsElement()->GetPrimaryFrame();
if (!frame || !frame->IsBrFrame()) {
return false;
}
nsContainerFrame* f = frame->GetParent();
while (f && f->IsFrameOfType(nsBox::eLineParticipant)) {
f = f->GetParent();
}
nsBlockFrame* blockAncestor = do_QueryFrame(f);
if (!blockAncestor) {
// The container frame doesn't support line breaking.
return false;
}
bool valid = false;
nsBlockInFlowLineIterator iter(blockAncestor, frame, &valid);
if (!valid) {
return false;
}
bool lineNonEmpty = LineHasNonEmptyContent(iter.GetLine());
if (!lineNonEmpty) {
return false;
}
while (iter.Next()) {
auto currentLine = iter.GetLine();
// Completely skip empty lines.
if (!currentLine->IsEmpty()) {
// If we come across an inline line, the BR has caused a visible line break.
if (currentLine->IsInline()) {
if (aNextLineFrame) {
*aNextLineFrame = currentLine->mFirstChild;
}
return false;
}
break;
}
}
return lineNonEmpty;
}
static nsRect
ComputeSVGReferenceRect(nsIFrame* aFrame,
StyleGeometryBox aGeometryBox)
{
MOZ_ASSERT(aFrame->GetContent()->IsSVGElement());
nsRect r;
// For SVG elements without associated CSS layout box, the used value for
// content-box, padding-box, border-box and margin-box is fill-box.
switch (aGeometryBox) {
case StyleGeometryBox::StrokeBox: {
// XXX Bug 1299876
// The size of srtoke-box is not correct if this graphic element has
// specific stroke-linejoin or stroke-linecap.
gfxRect bbox = nsSVGUtils::GetBBox(aFrame,
nsSVGUtils::eBBoxIncludeFill | nsSVGUtils::eBBoxIncludeStroke);
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
nsPresContext::AppUnitsPerCSSPixel());
break;
}
case StyleGeometryBox::ViewBox: {
nsIContent* content = aFrame->GetContent();
nsSVGElement* element = static_cast<nsSVGElement*>(content);
SVGViewportElement* svgElement = element->GetCtx();
MOZ_ASSERT(svgElement);
if (svgElement && svgElement->HasViewBoxRect()) {
// If a ‘viewBox‘ attribute is specified for the SVG viewport creating
// element:
// 1. The reference box is positioned at the origin of the coordinate
// system established by the ‘viewBox‘ attribute.
// 2. The dimension of the reference box is set to the width and height
// values of the ‘viewBox‘ attribute.
nsSVGViewBox* viewBox = svgElement->GetViewBox();
const nsSVGViewBoxRect& value = viewBox->GetAnimValue();
r = nsRect(nsPresContext::CSSPixelsToAppUnits(value.x),
nsPresContext::CSSPixelsToAppUnits(value.y),
nsPresContext::CSSPixelsToAppUnits(value.width),
nsPresContext::CSSPixelsToAppUnits(value.height));
} else {
// No viewBox is specified, uses the nearest SVG viewport as reference
// box.
svgFloatSize viewportSize = svgElement->GetViewportSize();
r = nsRect(0, 0,
nsPresContext::CSSPixelsToAppUnits(viewportSize.width),
nsPresContext::CSSPixelsToAppUnits(viewportSize.height));
}
break;
}
case StyleGeometryBox::NoBox:
case StyleGeometryBox::BorderBox:
case StyleGeometryBox::ContentBox:
case StyleGeometryBox::PaddingBox:
case StyleGeometryBox::MarginBox:
case StyleGeometryBox::FillBox: {
gfxRect bbox = nsSVGUtils::GetBBox(aFrame,
nsSVGUtils::eBBoxIncludeFill);
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
nsPresContext::AppUnitsPerCSSPixel());
break;
}
default:{
MOZ_ASSERT_UNREACHABLE("unknown StyleGeometryBox type");
gfxRect bbox = nsSVGUtils::GetBBox(aFrame,
nsSVGUtils::eBBoxIncludeFill);
r = nsLayoutUtils::RoundGfxRectToAppRect(bbox,
nsPresContext::AppUnitsPerCSSPixel());
break;
}
}
return r;
}
static nsRect
ComputeHTMLReferenceRect(nsIFrame* aFrame,
StyleGeometryBox aGeometryBox)
{
nsRect r;
// For elements with associated CSS layout box, the used value for fill-box,
// stroke-box and view-box is border-box.
switch (aGeometryBox) {
case StyleGeometryBox::ContentBox:
r = aFrame->GetContentRectRelativeToSelf();
break;
case StyleGeometryBox::PaddingBox:
r = aFrame->GetPaddingRectRelativeToSelf();
break;
case StyleGeometryBox::MarginBox:
r = aFrame->GetMarginRectRelativeToSelf();
break;
case StyleGeometryBox::NoBox:
case StyleGeometryBox::BorderBox:
case StyleGeometryBox::FillBox:
case StyleGeometryBox::StrokeBox:
case StyleGeometryBox::ViewBox:
r = aFrame->GetRectRelativeToSelf();
break;
default:
MOZ_ASSERT_UNREACHABLE("unknown StyleGeometryBox type");
r = aFrame->GetRectRelativeToSelf();
break;
}
return r;
}
/* static */ nsRect
nsLayoutUtils::ComputeGeometryBox(nsIFrame* aFrame,
StyleGeometryBox aGeometryBox)
{
// We use ComputeSVGReferenceRect for all SVG elements, except <svg>
// element, which does have an associated CSS layout box. In this case we
// should still use ComputeHTMLReferenceRect for region computing.
nsRect r = (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)
? ComputeSVGReferenceRect(aFrame, aGeometryBox)
: ComputeHTMLReferenceRect(aFrame, aGeometryBox);
return r;
}
/* static */ nsPoint
nsLayoutUtils::ComputeOffsetToUserSpace(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
{
nsPoint offsetToBoundingBox = aBuilder->ToReferenceFrame(aFrame) -
nsSVGIntegrationUtils::GetOffsetToBoundingBox(aFrame);
if (!aFrame->IsFrameOfType(nsIFrame::eSVG)) {
// Snap the offset if the reference frame is not a SVG frame, since other
// frames will be snapped to pixel when rendering.
offsetToBoundingBox = nsPoint(
aFrame->PresContext()->RoundAppUnitsToNearestDevPixels(offsetToBoundingBox.x),
aFrame->PresContext()->RoundAppUnitsToNearestDevPixels(offsetToBoundingBox.y));
}
// During SVG painting, the offset computed here is applied to the gfxContext
// "ctx" used to paint the mask. After applying only "offsetToBoundingBox",
// "ctx" would have its origin at the top left corner of frame's bounding box
// (over all continuations).
// However, SVG painting needs the origin to be located at the origin of the
// SVG frame's "user space", i.e. the space in which, for example, the
// frame's BBox lives.
// SVG geometry frames and foreignObject frames apply their own offsets, so
// their position is relative to their user space. So for these frame types,
// if we want "ctx" to be in user space, we first need to subtract the
// frame's position so that SVG painting can later add it again and the
// frame is painted in the right place.
gfxPoint toUserSpaceGfx = nsSVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(aFrame);
nsPoint toUserSpace =
nsPoint(nsPresContext::CSSPixelsToAppUnits(float(toUserSpaceGfx.x)),
nsPresContext::CSSPixelsToAppUnits(float(toUserSpaceGfx.y)));
return (offsetToBoundingBox - toUserSpace);
}
/* static */ uint8_t
nsLayoutUtils::ControlCharVisibilityDefault()
{
return StylePrefs::sControlCharVisibility
? NS_STYLE_CONTROL_CHARACTER_VISIBILITY_VISIBLE
: NS_STYLE_CONTROL_CHARACTER_VISIBILITY_HIDDEN;
}
/* static */
already_AddRefed<nsFontMetrics>
nsLayoutUtils::GetMetricsFor(nsPresContext* aPresContext,
bool aIsVertical,
const nsStyleFont* aStyleFont,
nscoord aFontSize,
bool aUseUserFontSet,
FlushUserFontSet aFlushUserFontSet)
{
nsFont font = aStyleFont->mFont;
font.size = aFontSize;
gfxFont::Orientation orientation
= aIsVertical ? gfxFont::eVertical : gfxFont::eHorizontal;
nsFontMetrics::Params params;
params.language = aStyleFont->mLanguage;
params.explicitLanguage = aStyleFont->mExplicitLanguage;
params.orientation = orientation;
params.userFontSet = aUseUserFontSet
? aPresContext->GetUserFontSet(aFlushUserFontSet == FlushUserFontSet::Yes)
: nullptr;
params.textPerf = aPresContext->GetTextPerfMetrics();
return aPresContext->DeviceContext()->GetMetricsFor(font, params);
}
/* static */ void
nsLayoutUtils::FixupNoneGeneric(nsFont* aFont,
const nsPresContext* aPresContext,
uint8_t aGenericFontID,
const nsFont* aDefaultVariableFont)
{
bool useDocumentFonts =
aPresContext->GetCachedBoolPref(kPresContext_UseDocumentFonts);
if (aGenericFontID == kGenericFont_NONE ||
(!useDocumentFonts && (aGenericFontID == kGenericFont_cursive ||
aGenericFontID == kGenericFont_fantasy))) {
FontFamilyType defaultGeneric =
aDefaultVariableFont->fontlist.GetDefaultFontType();
MOZ_ASSERT(aDefaultVariableFont->fontlist.IsEmpty() &&
(defaultGeneric == eFamily_serif ||
defaultGeneric == eFamily_sans_serif));
if (defaultGeneric != eFamily_none) {
if (useDocumentFonts) {
aFont->fontlist.SetDefaultFontType(defaultGeneric);
} else {
// Either prioritize the first generic in the list,
// or (if there isn't one) prepend the default variable font.
if (!aFont->fontlist.PrioritizeFirstGeneric()) {
aFont->fontlist.PrependGeneric(defaultGeneric);
}
}
}
} else {
aFont->fontlist.SetDefaultFontType(eFamily_none);
}
}
/* static */ void
nsLayoutUtils::ApplyMinFontSize(nsStyleFont* aFont,
const nsPresContext* aPresContext,
nscoord aMinFontSize)
{
nscoord fontSize = aFont->mSize;
// enforce the user' specified minimum font-size on the value that we expose
// (but don't change font-size:0, since that would unhide hidden text)
if (fontSize > 0) {
if (aMinFontSize < 0) {
aMinFontSize = 0;
} else {
aMinFontSize = (aMinFontSize * aFont->mMinFontSizeRatio) / 100;
}
if (fontSize < aMinFontSize && !aPresContext->IsChrome()) {
// override the minimum font-size constraint
fontSize = aMinFontSize;
}
}
aFont->mFont.size = fontSize;
}
/* static */ void
nsLayoutUtils::ComputeSystemFont(nsFont* aSystemFont, LookAndFeel::FontID aFontID,
const nsPresContext* aPresContext,
const nsFont* aDefaultVariableFont)
{
gfxFontStyle fontStyle;
float devPerCSS =
(float)nsPresContext::AppUnitsPerCSSPixel() /
aPresContext->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom();
nsAutoString systemFontName;
if (LookAndFeel::GetFont(aFontID, systemFontName, fontStyle, devPerCSS)) {
systemFontName.Trim("\"'");
aSystemFont->fontlist = FontFamilyList(systemFontName, eUnquotedName);
aSystemFont->fontlist.SetDefaultFontType(eFamily_none);
aSystemFont->style = fontStyle.style;
aSystemFont->systemFont = fontStyle.systemFont;
aSystemFont->weight = fontStyle.weight;
aSystemFont->stretch = fontStyle.stretch;
aSystemFont->size =
NSFloatPixelsToAppUnits(fontStyle.size,
aPresContext->DeviceContext()->
AppUnitsPerDevPixelAtUnitFullZoom());
//aSystemFont->langGroup = fontStyle.langGroup;
aSystemFont->sizeAdjust = fontStyle.sizeAdjust;
#ifdef XP_WIN
// XXXldb This platform-specific stuff should be in the
// LookAndFeel implementation, not here.
// XXXzw Should we even still *have* this code? It looks to be making
// old, probably obsolete assumptions.
if (aFontID == LookAndFeel::eFont_Field ||
aFontID == LookAndFeel::eFont_Button ||
aFontID == LookAndFeel::eFont_List) {
// As far as I can tell the system default fonts and sizes
// on MS-Windows for Buttons, Listboxes/Comboxes and Text Fields are
// all pre-determined and cannot be changed by either the control panel
// or programmatically.
// Fields (text fields)
// Button and Selects (listboxes/comboboxes)
// We use whatever font is defined by the system. Which it appears
// (and the assumption is) it is always a proportional font. Then we
// always use 2 points smaller than what the browser has defined as
// the default proportional font.
// Assumption: system defined font is proportional
aSystemFont->size =
std::max(aDefaultVariableFont->size -
nsPresContext::CSSPointsToAppUnits(2), 0);
}
#endif
}
}
static inline void
AssertValidFontTag(const nsString& aString)
{
// To be valid as a font feature tag, a string MUST be:
MOZ_ASSERT(aString.Length() == 4 && // (1) exactly 4 chars long
NS_IsAscii(aString.BeginReading()) && // (2) entirely ASCII
isprint(aString[0]) && // (3) all printable chars
isprint(aString[1]) &&
isprint(aString[2]) &&
isprint(aString[3]));
}
/* static */ void
nsLayoutUtils::ComputeFontFeatures(const nsCSSValuePairList *aFeaturesList,
nsTArray<gfxFontFeature>& aFeatureSettings)
{
aFeatureSettings.Clear();
for (const nsCSSValuePairList* p = aFeaturesList; p; p = p->mNext) {
gfxFontFeature feat;
MOZ_ASSERT(aFeaturesList->mXValue.GetUnit() == eCSSUnit_String,
"unexpected value unit");
// tag is a 4-byte ASCII sequence
nsAutoString tag;
p->mXValue.GetStringValue(tag);
AssertValidFontTag(tag);
if (tag.Length() != 4) {
continue;
}
// parsing validates that these are ASCII chars
// tags are always big-endian
feat.mTag = (tag[0] << 24) | (tag[1] << 16) | (tag[2] << 8) | tag[3];
// value
NS_ASSERTION(p->mYValue.GetUnit() == eCSSUnit_Integer,
"should have found an integer unit");
feat.mValue = p->mYValue.GetIntValue();
aFeatureSettings.AppendElement(feat);
}
}
/* static */ void
nsLayoutUtils::ComputeFontVariations(const nsCSSValuePairList* aVariationsList,
nsTArray<gfxFontVariation>& aVariationSettings)
{
aVariationSettings.Clear();
for (const nsCSSValuePairList* p = aVariationsList; p; p = p->mNext) {
gfxFontVariation var;
MOZ_ASSERT(aVariationsList->mXValue.GetUnit() == eCSSUnit_String,
"unexpected value unit");
// tag is a 4-byte ASCII sequence
nsAutoString tag;
p->mXValue.GetStringValue(tag);
AssertValidFontTag(tag);
if (tag.Length() != 4) {
continue;
}
// parsing validates that these are ASCII chars
// tags are always big-endian
var.mTag = (tag[0] << 24) | (tag[1] << 16) | (tag[2] << 8) | tag[3];
// value
NS_ASSERTION(p->mYValue.GetUnit() == eCSSUnit_Number,
"should have found a number unit");
var.mValue = p->mYValue.GetFloatValue();
aVariationSettings.AppendElement(var);
}
}
/* static */ uint32_t
nsLayoutUtils::ParseFontLanguageOverride(const nsAString& aLangTag)
{
if (!aLangTag.Length() || aLangTag.Length() > 4) {
return NO_FONT_LANGUAGE_OVERRIDE;
}
uint32_t index, result = 0;
for (index = 0; index < aLangTag.Length(); ++index) {
char16_t ch = aLangTag[index];
if (!nsCRT::IsAscii(ch)) { // valid tags are pure ASCII
return NO_FONT_LANGUAGE_OVERRIDE;
}
result = (result << 8) + ch;
}
while (index++ < 4) {
result = (result << 8) + 0x20;
}
return result;
}
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