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gecko-dev/layout/base/nsPresContext.cpp

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/* -*- 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/. */
/* a presentation of a document, part 1 */
#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Encoding.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "base/basictypes.h"
#include "nsCOMPtr.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsIPresShellInlines.h"
#include "nsDocShell.h"
#include "nsIContentViewer.h"
#include "nsPIDOMWindow.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsIDocument.h"
#include "nsIDocumentInlines.h"
#include "nsIPrintSettings.h"
#include "nsLanguageAtomService.h"
#include "mozilla/LookAndFeel.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIDOMHTMLDocument.h"
#include "nsHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsIWeakReferenceUtils.h"
#include "nsThreadUtils.h"
#include "nsFrameManager.h"
#include "nsLayoutUtils.h"
#include "nsViewManager.h"
#include "mozilla/GeckoRestyleManager.h"
#include "mozilla/RestyleManager.h"
#include "mozilla/RestyleManagerInlines.h"
#include "SurfaceCacheUtils.h"
#include "nsMediaFeatures.h"
#include "nsRuleNode.h"
#include "gfxPlatform.h"
#include "nsCSSRules.h"
#include "nsFontFaceLoader.h"
#include "mozilla/AnimationEventDispatcher.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EventListenerManager.h"
#include "prenv.h"
#include "nsPluginFrame.h"
#include "nsTransitionManager.h"
#include "nsAnimationManager.h"
#include "CounterStyleManager.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Element.h"
#include "nsIMessageManager.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/MediaQueryList.h"
#include "nsSMILAnimationController.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/PBrowserParent.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/TabParent.h"
#include "nsRefreshDriver.h"
#include "Layers.h"
#include "LayerUserData.h"
#include "ClientLayerManager.h"
#include "mozilla/dom/NotifyPaintEvent.h"
#include "gfxPrefs.h"
#include "nsIDOMChromeWindow.h"
#include "nsFrameLoader.h"
#include "mozilla/dom/FontFaceSet.h"
#include "nsContentUtils.h"
#include "nsPIWindowRoot.h"
#include "mozilla/Preferences.h"
#include "gfxTextRun.h"
#include "nsFontFaceUtils.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/Performance.h"
#include "mozilla/dom/PerformanceTiming.h"
#include "mozilla/layers/APZThreadUtils.h"
// Needed for Start/Stop of Image Animation
#include "imgIContainer.h"
#include "nsIImageLoadingContent.h"
#include "nsCSSParser.h"
#include "nsBidiUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsBidi.h"
#include "mozilla/dom/URL.h"
#include "mozilla/ServoCSSParser.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
uint8_t gNotifySubDocInvalidationData;
// This preference was first introduced in Bug 232227, in order to prevent
// system colors from being exposed to CSS or canvas.
constexpr char kUseStandinsForNativeColors[] = "ui.use_standins_for_native_colors";
/**
* Layer UserData for ContainerLayers that want to be notified
* of local invalidations of them and their descendant layers.
* Pass a callback to ComputeDifferences to have these called.
*/
class ContainerLayerPresContext : public LayerUserData {
public:
nsPresContext* mPresContext;
};
namespace {
class CharSetChangingRunnable : public Runnable
{
public:
CharSetChangingRunnable(nsPresContext* aPresContext,
NotNull<const Encoding*> aCharSet)
: Runnable("CharSetChangingRunnable"),
mPresContext(aPresContext),
mCharSet(aCharSet)
{
}
NS_IMETHOD Run() override
{
mPresContext->DoChangeCharSet(mCharSet);
return NS_OK;
}
private:
RefPtr<nsPresContext> mPresContext;
NotNull<const Encoding*> mCharSet;
};
} // namespace
nscolor
nsPresContext::MakeColorPref(const nsString& aColor)
{
bool ok;
nscolor result;
ServoStyleSet* servoStyleSet = mShell && mShell->StyleSet()
? mShell->StyleSet()->GetAsServo()
: nullptr;
if (servoStyleSet) {
ok = ServoCSSParser::ComputeColor(servoStyleSet, NS_RGB(0, 0, 0), aColor,
&result);
} else {
nsCSSParser parser;
nsCSSValue value;
ok = parser.ParseColorString(aColor, nullptr, 0, value) &&
nsRuleNode::ComputeColor(value, this, nullptr, result);
}
if (!ok) {
// Any better choices?
result = NS_RGB(0, 0, 0);
}
return result;
}
bool
nsPresContext::IsDOMPaintEventPending()
{
if (mFireAfterPaintEvents) {
return true;
}
nsRootPresContext* drpc = GetRootPresContext();
if (drpc && drpc->mRefreshDriver->ViewManagerFlushIsPending()) {
// Since we're promising that there will be a MozAfterPaint event
// fired, we record an empty invalidation in case display list
// invalidation doesn't invalidate anything further.
NotifyInvalidation(drpc->mRefreshDriver->LastTransactionId() + 1, nsRect(0, 0, 0, 0));
NS_ASSERTION(mFireAfterPaintEvents, "Why aren't we planning to fire the event?");
return true;
}
return false;
}
void
nsPresContext::PrefChangedCallback(const char* aPrefName, void* instance_data)
{
RefPtr<nsPresContext> presContext =
static_cast<nsPresContext*>(instance_data);
NS_ASSERTION(nullptr != presContext, "bad instance data");
if (nullptr != presContext) {
presContext->PreferenceChanged(aPrefName);
}
}
void
nsPresContext::PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure)
{
nsPresContext* presContext = (nsPresContext*)aClosure;
NS_ASSERTION(presContext != nullptr, "bad instance data");
if (presContext)
presContext->UpdateAfterPreferencesChanged();
}
static bool
IsVisualCharset(NotNull<const Encoding*> aCharset)
{
return aCharset == ISO_8859_8_ENCODING;
}
nsPresContext::nsPresContext(nsIDocument* aDocument, nsPresContextType aType)
: mType(aType),
mShell(nullptr),
mDocument(aDocument),
mMedium(aType == eContext_Galley ? nsGkAtoms::screen : nsGkAtoms::print),
mMediaEmulated(mMedium),
mLinkHandler(nullptr),
mInflationDisabledForShrinkWrap(false),
mBaseMinFontSize(0),
mSystemFontScale(1.0),
mTextZoom(1.0),
mEffectiveTextZoom(1.0),
mFullZoom(1.0),
mOverrideDPPX(0.0),
mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
mCurAppUnitsPerDevPixel(0),
mAutoQualityMinFontSizePixelsPref(0),
// origin nscoord_MIN is impossible, so the first ResizeReflow always fires
mLastResizeEventVisibleArea(nsRect(nscoord_MIN, nscoord_MIN,
NS_UNCONSTRAINEDSIZE,
NS_UNCONSTRAINEDSIZE)),
mPageSize(-1, -1),
mPageScale(0.0),
mPPScale(1.0f),
mDefaultColor(NS_RGBA(0,0,0,0)),
mBackgroundColor(NS_RGB(0xFF, 0xFF, 0xFF)),
mLinkColor(NS_RGB(0x00, 0x00, 0xEE)),
mActiveLinkColor(NS_RGB(0xEE, 0x00, 0x00)),
mVisitedLinkColor(NS_RGB(0x55, 0x1A, 0x8B)),
mFocusBackgroundColor(mBackgroundColor),
mFocusTextColor(mDefaultColor),
mBodyTextColor(mDefaultColor),
mViewportScrollbarOverrideElement(nullptr),
mViewportStyleScrollbar(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO),
mFocusRingWidth(1),
mExistThrottledUpdates(false),
// mImageAnimationMode is initialised below, in constructor body
mImageAnimationModePref(imgIContainer::kNormalAnimMode),
mFontGroupCacheDirty(true),
mInterruptChecksToSkip(0),
mElementsRestyled(0),
mFramesConstructed(0),
mFramesReflowed(0),
mInteractionTimeEnabled(true),
mTelemetryScrollLastY(0),
mTelemetryScrollMaxY(0),
mTelemetryScrollTotalY(0),
mHasPendingInterrupt(false),
mPendingInterruptFromTest(false),
mInterruptsEnabled(false),
mUseDocumentFonts(true),
mUseDocumentColors(true),
mUnderlineLinks(true),
mSendAfterPaintToContent(false),
mUseFocusColors(false),
mFocusRingOnAnything(false),
mFocusRingStyle(false),
mDrawImageBackground(true), // always draw the background
mDrawColorBackground(true),
// mNeverAnimate is initialised below, in constructor body
mIsRenderingOnlySelection(false),
mPaginated(aType != eContext_Galley),
mCanPaginatedScroll(false),
mDoScaledTwips(true),
mIsRootPaginatedDocument(false),
mPrefBidiDirection(false),
mPrefScrollbarSide(0),
mPendingSysColorChanged(false),
mPendingThemeChanged(false),
mPendingUIResolutionChanged(false),
mPendingMediaFeatureValuesChanged(false),
mPrefChangePendingNeedsReflow(false),
mIsEmulatingMedia(false),
mIsGlyph(false),
mUsesRootEMUnits(false),
mUsesExChUnits(false),
mPendingViewportChange(false),
mCounterStylesDirty(true),
mPostedFlushCounterStyles(false),
mFontFeatureValuesDirty(true),
mPostedFlushFontFeatureValues(false),
mSuppressResizeReflow(false),
mIsVisual(false),
mFireAfterPaintEvents(false),
mIsChrome(false),
mIsChromeOriginImage(false),
mPaintFlashing(false),
mPaintFlashingInitialized(false),
mHasWarnedAboutPositionedTableParts(false),
mHasWarnedAboutTooLargeDashedOrDottedRadius(false),
mQuirkSheetAdded(false),
mNeedsPrefUpdate(false),
mHadNonBlankPaint(false)
#ifdef RESTYLE_LOGGING
, mRestyleLoggingEnabled(false)
#endif
#ifdef DEBUG
, mInitialized(false)
#endif
{
PodZero(&mBorderWidthTable);
#ifdef DEBUG
PodZero(&mLayoutPhaseCount);
#endif
if (!IsDynamic()) {
mImageAnimationMode = imgIContainer::kDontAnimMode;
mNeverAnimate = true;
} else {
mImageAnimationMode = imgIContainer::kNormalAnimMode;
mNeverAnimate = false;
}
NS_ASSERTION(mDocument, "Null document");
// if text perf logging enabled, init stats struct
if (MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_textperf), LogLevel::Warning)) {
mTextPerf = new gfxTextPerfMetrics();
}
if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
mMissingFonts = new gfxMissingFontRecorder();
}
}
void
nsPresContext::Destroy()
{
if (mEventManager) {
// unclear if these are needed, but can't hurt
mEventManager->NotifyDestroyPresContext(this);
mEventManager->SetPresContext(nullptr);
mEventManager = nullptr;
}
if (mPrefChangedTimer)
{
mPrefChangedTimer->Cancel();
mPrefChangedTimer = nullptr;
}
// Unregister preference callbacks
Preferences::UnregisterPrefixCallback(nsPresContext::PrefChangedCallback,
"font.",
this);
Preferences::UnregisterPrefixCallback(nsPresContext::PrefChangedCallback,
"browser.display.",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"browser.underline_anchors",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"browser.anchor_color",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"browser.active_color",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"browser.visited_color",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"image.animation_mode",
this);
Preferences::UnregisterPrefixCallback(nsPresContext::PrefChangedCallback,
"bidi.",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"dom.send_after_paint_to_content",
this);
Preferences::UnregisterPrefixCallback(nsPresContext::PrefChangedCallback,
"gfx.font_rendering.",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"layout.css.dpi",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"layout.css.devPixelsPerPx",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"nglayout.debug.paint_flashing",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"nglayout.debug.paint_flashing_chrome",
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
kUseStandinsForNativeColors,
this);
Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
"intl.accept_languages",
this);
mRefreshDriver = nullptr;
}
nsPresContext::~nsPresContext()
{
NS_PRECONDITION(!mShell, "Presshell forgot to clear our mShell pointer");
DetachShell();
Destroy();
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPresContext)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPresContext)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsPresContext, LastRelease())
void
nsPresContext::LastRelease()
{
if (IsRoot()) {
static_cast<nsRootPresContext*>(this)->CancelAllDidPaintTimers();
}
if (mMissingFonts) {
mMissingFonts->Clear();
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsPresContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsPresContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnimationEventDispatcher);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument);
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mDeviceContext); // not xpcom
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEffectCompositor);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEventManager);
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mLanguage); // an atom
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTheme); // a service
// NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLangService); // a service
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrintSettings);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrefChangedTimer);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsPresContext)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnimationEventDispatcher);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDeviceContext); // worth bothering?
NS_IMPL_CYCLE_COLLECTION_UNLINK(mEffectCompositor);
// NS_RELEASE(tmp->mLanguage); // an atom
// NS_IMPL_CYCLE_COLLECTION_UNLINK(mTheme); // a service
// NS_IMPL_CYCLE_COLLECTION_UNLINK(mLangService); // a service
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPrintSettings);
tmp->Destroy();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
// whether no native theme service exists;
// if this gets set to true, we'll stop asking for it.
static bool sNoTheme = false;
// Set to true when LookAndFeelChanged needs to be called. This is used
// because the look and feel is a service, so there's no need to notify it from
// more than one prescontext.
static bool sLookAndFeelChanged;
// Set to true when ThemeChanged needs to be called on mTheme. This is used
// because mTheme is a service, so there's no need to notify it from more than
// one prescontext.
static bool sThemeChanged;
void
nsPresContext::GetDocumentColorPreferences()
{
// Make sure the preferences are initialized. In the normal run,
// they would already be, because gfxPlatform would have been created,
// but in some reference tests, that is not the case.
gfxPrefs::GetSingleton();
int32_t useAccessibilityTheme = 0;
bool usePrefColors = true;
bool isChromeDocShell = false;
static int32_t sDocumentColorsSetting;
static bool sDocumentColorsSettingPrefCached = false;
static bool sUseStandinsForNativeColors = false;
if (!sDocumentColorsSettingPrefCached) {
sDocumentColorsSettingPrefCached = true;
Preferences::AddIntVarCache(&sDocumentColorsSetting,
"browser.display.document_color_use",
0);
// The preference "ui.use_standins_for_native_colors" also affects
// default foreground and background colors.
Preferences::AddBoolVarCache(&sUseStandinsForNativeColors,
kUseStandinsForNativeColors);
}
nsIDocument* doc = mDocument->GetDisplayDocument();
if (doc && doc->GetDocShell()) {
isChromeDocShell = nsIDocShellTreeItem::typeChrome ==
doc->GetDocShell()->ItemType();
} else {
nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
if (docShell) {
isChromeDocShell = nsIDocShellTreeItem::typeChrome == docShell->ItemType();
}
}
mIsChromeOriginImage = mDocument->IsBeingUsedAsImage() &&
IsChromeURI(mDocument->GetDocumentURI());
if (isChromeDocShell || mIsChromeOriginImage) {
usePrefColors = false;
} else {
useAccessibilityTheme =
LookAndFeel::GetInt(LookAndFeel::eIntID_UseAccessibilityTheme, 0);
usePrefColors = !useAccessibilityTheme;
}
if (usePrefColors) {
usePrefColors =
!Preferences::GetBool("browser.display.use_system_colors", false);
}
if (sUseStandinsForNativeColors) {
// Once the preference "ui.use_standins_for_native_colors" is enabled,
// use fixed color values instead of prefered colors and system colors.
mDefaultColor = LookAndFeel::GetColorUsingStandins(
LookAndFeel::eColorID_windowtext, NS_RGB(0x00, 0x00, 0x00));
mBackgroundColor = LookAndFeel::GetColorUsingStandins(
LookAndFeel::eColorID_window, NS_RGB(0xff, 0xff, 0xff));
} else if (usePrefColors) {
nsAutoString colorStr;
Preferences::GetString("browser.display.foreground_color", colorStr);
if (!colorStr.IsEmpty()) {
mDefaultColor = MakeColorPref(colorStr);
}
colorStr.Truncate();
Preferences::GetString("browser.display.background_color", colorStr);
if (!colorStr.IsEmpty()) {
mBackgroundColor = MakeColorPref(colorStr);
}
}
else {
mDefaultColor =
LookAndFeel::GetColor(LookAndFeel::eColorID_WindowForeground,
NS_RGB(0x00, 0x00, 0x00));
mBackgroundColor =
LookAndFeel::GetColor(LookAndFeel::eColorID_WindowBackground,
NS_RGB(0xFF, 0xFF, 0xFF));
}
// Wherever we got the default background color from, ensure it is
// opaque.
mBackgroundColor = NS_ComposeColors(NS_RGB(0xFF, 0xFF, 0xFF),
mBackgroundColor);
// Now deal with the pref:
// 0 = default: always, except in high contrast mode
// 1 = always
// 2 = never
if (sDocumentColorsSetting == 1 || mDocument->IsBeingUsedAsImage()) {
mUseDocumentColors = true;
} else if (sDocumentColorsSetting == 2) {
mUseDocumentColors = isChromeDocShell || mIsChromeOriginImage;
} else {
MOZ_ASSERT(!useAccessibilityTheme ||
!(isChromeDocShell || mIsChromeOriginImage),
"The accessibility theme should only be on for non-chrome");
mUseDocumentColors = !useAccessibilityTheme;
}
}
void
nsPresContext::GetUserPreferences()
{
if (!GetPresShell()) {
// No presshell means nothing to do here. We'll do this when we
// get a presshell.
return;
}
mAutoQualityMinFontSizePixelsPref =
Preferences::GetInt("browser.display.auto_quality_min_font_size");
// * document colors
GetDocumentColorPreferences();
mSendAfterPaintToContent =
Preferences::GetBool("dom.send_after_paint_to_content",
mSendAfterPaintToContent);
// * link colors
mUnderlineLinks =
Preferences::GetBool("browser.underline_anchors", mUnderlineLinks);
nsAutoString colorStr;
Preferences::GetString("browser.anchor_color", colorStr);
if (!colorStr.IsEmpty()) {
mLinkColor = MakeColorPref(colorStr);
}
colorStr.Truncate();
Preferences::GetString("browser.active_color", colorStr);
if (!colorStr.IsEmpty()) {
mActiveLinkColor = MakeColorPref(colorStr);
}
colorStr.Truncate();
Preferences::GetString("browser.visited_color", colorStr);
if (!colorStr.IsEmpty()) {
mVisitedLinkColor = MakeColorPref(colorStr);
}
mUseFocusColors =
Preferences::GetBool("browser.display.use_focus_colors", mUseFocusColors);
mFocusTextColor = mDefaultColor;
mFocusBackgroundColor = mBackgroundColor;
colorStr.Truncate();
Preferences::GetString("browser.display.focus_text_color", colorStr);
if (!colorStr.IsEmpty()) {
mFocusTextColor = MakeColorPref(colorStr);
}
colorStr.Truncate();
Preferences::GetString("browser.display.focus_background_color", colorStr);
if (!colorStr.IsEmpty()) {
mFocusBackgroundColor = MakeColorPref(colorStr);
}
mFocusRingWidth =
Preferences::GetInt("browser.display.focus_ring_width", mFocusRingWidth);
mFocusRingOnAnything =
Preferences::GetBool("browser.display.focus_ring_on_anything",
mFocusRingOnAnything);
mFocusRingStyle =
Preferences::GetInt("browser.display.focus_ring_style", mFocusRingStyle);
mBodyTextColor = mDefaultColor;
// * use fonts?
mUseDocumentFonts =
Preferences::GetInt("browser.display.use_document_fonts") != 0;
mPrefScrollbarSide = Preferences::GetInt("layout.scrollbar.side");
mLangGroupFontPrefs.Reset();
mFontGroupCacheDirty = true;
StaticPresData::Get()->ResetCachedFontPrefs();
// * image animation
nsAutoCString animatePref;
Preferences::GetCString("image.animation_mode", animatePref);
if (animatePref.EqualsLiteral("normal"))
mImageAnimationModePref = imgIContainer::kNormalAnimMode;
else if (animatePref.EqualsLiteral("none"))
mImageAnimationModePref = imgIContainer::kDontAnimMode;
else if (animatePref.EqualsLiteral("once"))
mImageAnimationModePref = imgIContainer::kLoopOnceAnimMode;
else // dynamic change to invalid value should act like it does initially
mImageAnimationModePref = imgIContainer::kNormalAnimMode;
uint32_t bidiOptions = GetBidi();
int32_t prefInt =
Preferences::GetInt(IBMBIDI_TEXTDIRECTION_STR,
GET_BIDI_OPTION_DIRECTION(bidiOptions));
SET_BIDI_OPTION_DIRECTION(bidiOptions, prefInt);
mPrefBidiDirection = prefInt;
prefInt =
Preferences::GetInt(IBMBIDI_TEXTTYPE_STR,
GET_BIDI_OPTION_TEXTTYPE(bidiOptions));
SET_BIDI_OPTION_TEXTTYPE(bidiOptions, prefInt);
prefInt =
Preferences::GetInt(IBMBIDI_NUMERAL_STR,
GET_BIDI_OPTION_NUMERAL(bidiOptions));
SET_BIDI_OPTION_NUMERAL(bidiOptions, prefInt);
// We don't need to force reflow: either we are initializing a new
// prescontext or we are being called from UpdateAfterPreferencesChanged()
// which triggers a reflow anyway.
SetBidi(bidiOptions);
}
void
nsPresContext::InvalidatePaintedLayers()
{
if (!mShell)
return;
nsIFrame* rootFrame = mShell->FrameManager()->GetRootFrame();
if (rootFrame) {
// FrameLayerBuilder caches invalidation-related values that depend on the
// appunits-per-dev-pixel ratio, so ensure that all PaintedLayer drawing
// is completely flushed.
rootFrame->InvalidateFrameSubtree();
}
}
void
nsPresContext::AppUnitsPerDevPixelChanged()
{
InvalidatePaintedLayers();
if (mDeviceContext) {
mDeviceContext->FlushFontCache();
}
if (HasCachedStyleData()) {
// All cached style data must be recomputed.
MediaFeatureValuesChanged(eRestyle_ForceDescendants, NS_STYLE_HINT_REFLOW);
}
mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
}
void
nsPresContext::PreferenceChanged(const char* aPrefName)
{
nsDependentCString prefName(aPrefName);
if (prefName.EqualsLiteral("layout.css.dpi") ||
prefName.EqualsLiteral("layout.css.devPixelsPerPx")) {
int32_t oldAppUnitsPerDevPixel = AppUnitsPerDevPixel();
if (mDeviceContext->CheckDPIChange() && mShell) {
nsCOMPtr<nsIPresShell> shell = mShell;
// Re-fetch the view manager's window dimensions in case there's a deferred
// resize which hasn't affected our mVisibleArea yet
nscoord oldWidthAppUnits, oldHeightAppUnits;
RefPtr<nsViewManager> vm = shell->GetViewManager();
if (!vm) {
return;
}
vm->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
float oldWidthDevPixels = oldWidthAppUnits/oldAppUnitsPerDevPixel;
float oldHeightDevPixels = oldHeightAppUnits/oldAppUnitsPerDevPixel;
nscoord width = NSToCoordRound(oldWidthDevPixels*AppUnitsPerDevPixel());
nscoord height = NSToCoordRound(oldHeightDevPixels*AppUnitsPerDevPixel());
vm->SetWindowDimensions(width, height);
AppUnitsPerDevPixelChanged();
}
return;
}
if (prefName.EqualsLiteral(GFX_MISSING_FONTS_NOTIFY_PREF)) {
if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
if (!mMissingFonts) {
mMissingFonts = new gfxMissingFontRecorder();
// trigger reflow to detect missing fonts on the current page
mPrefChangePendingNeedsReflow = true;
}
} else {
if (mMissingFonts) {
mMissingFonts->Clear();
}
mMissingFonts = nullptr;
}
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("font.")) ||
prefName.EqualsLiteral("intl.accept_languages")) {
// Changes to font family preferences don't change anything in the
// computed style data, so the style system won't generate a reflow
// hint for us. We need to do that manually.
// FIXME We could probably also handle changes to
// browser.display.auto_quality_min_font_size here, but that
// probably also requires clearing the text run cache, so don't
// bother (yet, anyway).
mPrefChangePendingNeedsReflow = true;
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("bidi."))) {
// Changes to bidi prefs need to trigger a reflow (see bug 443629)
mPrefChangePendingNeedsReflow = true;
// Changes to bidi.numeral also needs to empty the text run cache.
// This is handled in gfxTextRunWordCache.cpp.
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("gfx.font_rendering."))) {
// Changes to font_rendering prefs need to trigger a reflow
mPrefChangePendingNeedsReflow = true;
}
// we use a zero-delay timer to coalesce multiple pref updates
if (!mPrefChangedTimer)
{
// We will end up calling InvalidatePreferenceSheets one from each pres
// context, but all it's doing is clearing its cached sheet pointers,
// so it won't be wastefully recreating the sheet multiple times.
// The first pres context that has its mPrefChangedTimer called will
// be the one to cause the reconstruction of the pref style sheet.
nsLayoutStylesheetCache::InvalidatePreferenceSheets();
mPrefChangedTimer = CreateTimer(PrefChangedUpdateTimerCallback,
"PrefChangedUpdateTimerCallback", 0);
if (!mPrefChangedTimer) {
return;
}
}
if (prefName.EqualsLiteral("nglayout.debug.paint_flashing") ||
prefName.EqualsLiteral("nglayout.debug.paint_flashing_chrome")) {
mPaintFlashingInitialized = false;
return;
}
}
void
nsPresContext::UpdateAfterPreferencesChanged()
{
mPrefChangedTimer = nullptr;
if (!mContainer) {
// Delay updating until there is a container
mNeedsPrefUpdate = true;
return;
}
nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
if (docShell && nsIDocShellTreeItem::typeChrome == docShell->ItemType()) {
return;
}
// Initialize our state from the user preferences
GetUserPreferences();
// update the presShell: tell it to set the preference style rules up
if (mShell) {
mShell->UpdatePreferenceStyles();
}
InvalidatePaintedLayers();
mDeviceContext->FlushFontCache();
nsChangeHint hint = nsChangeHint(0);
if (mPrefChangePendingNeedsReflow) {
hint |= NS_STYLE_HINT_REFLOW;
}
// Preferences require rerunning selector matching because we rebuild
// the pref style sheet for some preference changes.
RebuildAllStyleData(hint, eRestyle_Subtree);
}
nsresult
nsPresContext::Init(nsDeviceContext* aDeviceContext)
{
NS_ASSERTION(!mInitialized, "attempt to reinit pres context");
NS_ENSURE_ARG(aDeviceContext);
mDeviceContext = aDeviceContext;
// In certain rare cases (such as changing page mode), we tear down layout
// state and re-initialize a new prescontext for a document. Given that we
// hang style state off the DOM, we detect that re-initialization case and
// lazily drop the servo data. We don't do this eagerly during layout teardown
// because that would incur an extra whole-tree traversal that's unnecessary
// most of the time.
if (mDocument->IsStyledByServo()) {
Element* root = mDocument->GetRootElement();
if (root && root->HasServoData()) {
ServoRestyleManager::ClearServoDataFromSubtree(root);
}
}
if (mDeviceContext->SetFullZoom(mFullZoom))
mDeviceContext->FlushFontCache();
mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
mEventManager = new mozilla::EventStateManager();
mAnimationEventDispatcher = new mozilla::AnimationEventDispatcher(this);
mEffectCompositor = new mozilla::EffectCompositor(this);
mTransitionManager = new nsTransitionManager(this);
mAnimationManager = new nsAnimationManager(this);
if (mDocument->GetDisplayDocument()) {
NS_ASSERTION(mDocument->GetDisplayDocument()->GetShell() &&
mDocument->GetDisplayDocument()->GetShell()->GetPresContext(),
"Why are we being initialized?");
mRefreshDriver = mDocument->GetDisplayDocument()->GetShell()->
GetPresContext()->RefreshDriver();
} else {
nsIDocument* parent = mDocument->GetParentDocument();
// Unfortunately, sometimes |parent| here has no presshell because
// printing screws up things. Assert that in other cases it does,
// but whenever the shell is null just fall back on using our own
// refresh driver.
NS_ASSERTION(!parent || mDocument->IsStaticDocument() || parent->GetShell(),
"How did we end up with a presshell if our parent doesn't "
"have one?");
if (parent && parent->GetShell()) {
NS_ASSERTION(parent->GetShell()->GetPresContext(),
"How did we get a presshell?");
// We don't have our container set yet at this point
nsCOMPtr<nsIDocShellTreeItem> ourItem = mDocument->GetDocShell();
if (ourItem) {
nsCOMPtr<nsIDocShellTreeItem> parentItem;
ourItem->GetSameTypeParent(getter_AddRefs(parentItem));
if (parentItem) {
Element* containingElement =
parent->FindContentForSubDocument(mDocument);
if (!containingElement->IsXULElement() ||
!containingElement->
HasAttr(kNameSpaceID_None,
nsGkAtoms::forceOwnRefreshDriver)) {
mRefreshDriver = parent->GetShell()->GetPresContext()->RefreshDriver();
}
}
}
}
if (!mRefreshDriver) {
mRefreshDriver = new nsRefreshDriver(this);
}
}
mLangService = nsLanguageAtomService::GetService();
// Register callbacks so we're notified when the preferences change
Preferences::RegisterPrefixCallback(nsPresContext::PrefChangedCallback,
"font.",
this);
Preferences::RegisterPrefixCallback(nsPresContext::PrefChangedCallback,
"browser.display.",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"browser.underline_anchors",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"browser.anchor_color",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"browser.active_color",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"browser.visited_color",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"image.animation_mode",
this);
Preferences::RegisterPrefixCallback(nsPresContext::PrefChangedCallback,
"bidi.",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"dom.send_after_paint_to_content",
this);
Preferences::RegisterPrefixCallback(nsPresContext::PrefChangedCallback,
"gfx.font_rendering.",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"layout.css.dpi",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"layout.css.devPixelsPerPx",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"nglayout.debug.paint_flashing",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"nglayout.debug.paint_flashing_chrome",
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
kUseStandinsForNativeColors,
this);
Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
"intl.accept_languages",
this);
nsresult rv = mEventManager->Init();
NS_ENSURE_SUCCESS(rv, rv);
mEventManager->SetPresContext(this);
#ifdef RESTYLE_LOGGING
mRestyleLoggingEnabled = GeckoRestyleManager::RestyleLoggingInitiallyEnabled();
#endif
#ifdef DEBUG
mInitialized = true;
#endif
return NS_OK;
}
// Note: We don't hold a reference on the shell; it has a reference to
// us
void
nsPresContext::AttachShell(nsIPresShell* aShell, StyleBackendType aBackendType)
{
MOZ_ASSERT(!mShell);
mShell = aShell;
if (aBackendType == StyleBackendType::Servo) {
mRestyleManager = new ServoRestyleManager(this);
} else {
mRestyleManager = new GeckoRestyleManager(this);
}
// Since CounterStyleManager is also the name of a method of
// nsPresContext, it is necessary to prefix the class with the mozilla
// namespace here.
mCounterStyleManager = new mozilla::CounterStyleManager(this);
nsIDocument *doc = mShell->GetDocument();
NS_ASSERTION(doc, "expect document here");
if (doc) {
// Have to update PresContext's mDocument before calling any other methods.
mDocument = doc;
}
// Initialize our state from the user preferences, now that we
// have a presshell, and hence a document.
GetUserPreferences();
if (doc) {
nsIURI *docURI = doc->GetDocumentURI();
if (IsDynamic() && docURI) {
bool isChrome = false;
bool isRes = false;
docURI->SchemeIs("chrome", &isChrome);
docURI->SchemeIs("resource", &isRes);
if (!isChrome && !isRes)
mImageAnimationMode = mImageAnimationModePref;
else
mImageAnimationMode = imgIContainer::kNormalAnimMode;
}
UpdateCharSet(doc->GetDocumentCharacterSet());
}
}
void
nsPresContext::DetachShell()
{
// The counter style manager's destructor needs to deallocate with the
// presshell arena. Disconnect it before nulling out the shell.
//
// XXXbholley: Given recent refactorings, it probably makes more sense to
// just null our mShell at the bottom of this function. I'm leaving it
// this way to preserve the old ordering, but I doubt anything would break.
if (mCounterStyleManager) {
mCounterStyleManager->Disconnect();
mCounterStyleManager = nullptr;
}
mShell = nullptr;
if (mAnimationEventDispatcher) {
mAnimationEventDispatcher->Disconnect();
mAnimationEventDispatcher = nullptr;
}
if (mEffectCompositor) {
mEffectCompositor->Disconnect();
mEffectCompositor = nullptr;
}
if (mTransitionManager) {
mTransitionManager->Disconnect();
mTransitionManager = nullptr;
}
if (mAnimationManager) {
mAnimationManager->Disconnect();
mAnimationManager = nullptr;
}
if (mRestyleManager) {
mRestyleManager->Disconnect();
mRestyleManager = nullptr;
}
if (mRefreshDriver && mRefreshDriver->GetPresContext() == this) {
mRefreshDriver->Disconnect();
// Can't null out the refresh driver here.
}
if (IsRoot()) {
nsRootPresContext* thisRoot = static_cast<nsRootPresContext*>(this);
// Have to cancel our plugin geometry timer, because the
// callback for that depends on a non-null presshell.
thisRoot->CancelApplyPluginGeometryTimer();
// The did-paint timer also depends on a non-null pres shell.
thisRoot->CancelAllDidPaintTimers();
}
}
void
nsPresContext::DoChangeCharSet(NotNull<const Encoding*> aCharSet)
{
UpdateCharSet(aCharSet);
mDeviceContext->FlushFontCache();
// In Stylo, if a document contains one or more <script> elements, frame
// construction might happen earlier than the UpdateCharSet(), so we need to
// restyle descendants to make their style data up-to-date.
RebuildAllStyleData(NS_STYLE_HINT_REFLOW,
mDocument->IsStyledByServo()
? eRestyle_ForceDescendants : nsRestyleHint(0));
}
void
nsPresContext::UpdateCharSet(NotNull<const Encoding*> aCharSet)
{
mLanguage = mLangService->LookupCharSet(aCharSet);
// this will be a language group (or script) code rather than a true language code
// bug 39570: moved from nsLanguageAtomService::LookupCharSet()
if (mLanguage == nsGkAtoms::Unicode) {
mLanguage = mLangService->GetLocaleLanguage();
}
mLangGroupFontPrefs.Reset();
mFontGroupCacheDirty = true;
switch (GET_BIDI_OPTION_TEXTTYPE(GetBidi())) {
case IBMBIDI_TEXTTYPE_LOGICAL:
SetVisualMode(false);
break;
case IBMBIDI_TEXTTYPE_VISUAL:
SetVisualMode(true);
break;
case IBMBIDI_TEXTTYPE_CHARSET:
default:
SetVisualMode(IsVisualCharset(aCharSet));
}
}
void
nsPresContext::DispatchCharSetChange(NotNull<const Encoding*> aEncoding)
{
RefPtr<CharSetChangingRunnable> runnable =
new CharSetChangingRunnable(this, aEncoding);
Document()->Dispatch(TaskCategory::Other, runnable.forget());
}
nsPresContext*
nsPresContext::GetParentPresContext()
{
nsIPresShell* shell = GetPresShell();
if (shell) {
nsViewManager* viewManager = shell->GetViewManager();
if (viewManager) {
nsView* view = viewManager->GetRootView();
if (view) {
view = view->GetParent(); // anonymous inner view
if (view) {
view = view->GetParent(); // subdocumentframe's view
if (view) {
nsIFrame* f = view->GetFrame();
if (f) {
return f->PresContext();
}
}
}
}
}
}
return nullptr;
}
nsPresContext*
nsPresContext::GetToplevelContentDocumentPresContext()
{
if (IsChrome())
return nullptr;
nsPresContext* pc = this;
for (;;) {
nsPresContext* parent = pc->GetParentPresContext();
if (!parent || parent->IsChrome())
return pc;
pc = parent;
}
}
nsIWidget*
nsPresContext::GetNearestWidget(nsPoint* aOffset)
{
NS_ENSURE_TRUE(mShell, nullptr);
nsIFrame* frame = mShell->GetRootFrame();
NS_ENSURE_TRUE(frame, nullptr);
return frame->GetView()->GetNearestWidget(aOffset);
}
nsIWidget*
nsPresContext::GetRootWidget()
{
NS_ENSURE_TRUE(mShell, nullptr);
nsViewManager* vm = mShell->GetViewManager();
if (!vm) {
return nullptr;
}
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
return widget.get();
}
// We may want to replace this with something faster, maybe caching the root prescontext
nsRootPresContext*
nsPresContext::GetRootPresContext()
{
nsPresContext* pc = this;
for (;;) {
nsPresContext* parent = pc->GetParentPresContext();
if (!parent)
break;
pc = parent;
}
return pc->IsRoot() ? static_cast<nsRootPresContext*>(pc) : nullptr;
}
void
nsPresContext::CompatibilityModeChanged()
{
if (!mShell) {
return;
}
nsIDocument* doc = mShell->GetDocument();
if (!doc) {
return;
}
StyleSetHandle styleSet = mShell->StyleSet();
if (styleSet->IsServo()) {
styleSet->AsServo()->CompatibilityModeChanged();
}
if (doc->IsSVGDocument()) {
// SVG documents never load quirk.css.
return;
}
bool needsQuirkSheet = CompatibilityMode() == eCompatibility_NavQuirks;
if (mQuirkSheetAdded == needsQuirkSheet) {
return;
}
auto cache = nsLayoutStylesheetCache::For(styleSet->BackendType());
StyleSheet* sheet = cache->QuirkSheet();
if (needsQuirkSheet) {
// quirk.css needs to come after html.css; we just keep it at the end.
DebugOnly<nsresult> rv =
styleSet->AppendStyleSheet(SheetType::Agent, sheet);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "failed to insert quirk.css");
} else {
DebugOnly<nsresult> rv =
styleSet->RemoveStyleSheet(SheetType::Agent, sheet);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "failed to remove quirk.css");
}
mQuirkSheetAdded = needsQuirkSheet;
}
// Helper function for setting Anim Mode on image
static void SetImgAnimModeOnImgReq(imgIRequest* aImgReq, uint16_t aMode)
{
if (aImgReq) {
nsCOMPtr<imgIContainer> imgCon;
aImgReq->GetImage(getter_AddRefs(imgCon));
if (imgCon) {
imgCon->SetAnimationMode(aMode);
}
}
}
// IMPORTANT: Assumption is that all images for a Presentation
// have the same Animation Mode (pavlov said this was OK)
//
// Walks content and set the animation mode
// this is a way to turn on/off image animations
void nsPresContext::SetImgAnimations(nsIContent *aParent, uint16_t aMode)
{
nsCOMPtr<nsIImageLoadingContent> imgContent(do_QueryInterface(aParent));
if (imgContent) {
nsCOMPtr<imgIRequest> imgReq;
imgContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgReq));
SetImgAnimModeOnImgReq(imgReq, aMode);
}
for (nsIContent* childContent = aParent->GetFirstChild();
childContent; childContent = childContent->GetNextSibling()) {
SetImgAnimations(childContent, aMode);
}
}
void
nsPresContext::SetSMILAnimations(nsIDocument *aDoc, uint16_t aNewMode,
uint16_t aOldMode)
{
if (aDoc->HasAnimationController()) {
nsSMILAnimationController* controller = aDoc->GetAnimationController();
switch (aNewMode)
{
case imgIContainer::kNormalAnimMode:
case imgIContainer::kLoopOnceAnimMode:
if (aOldMode == imgIContainer::kDontAnimMode)
controller->Resume(nsSMILTimeContainer::PAUSE_USERPREF);
break;
case imgIContainer::kDontAnimMode:
if (aOldMode != imgIContainer::kDontAnimMode)
controller->Pause(nsSMILTimeContainer::PAUSE_USERPREF);
break;
}
}
}
void
nsPresContext::SetImageAnimationMode(uint16_t aMode)
{
NS_ASSERTION(aMode == imgIContainer::kNormalAnimMode ||
aMode == imgIContainer::kDontAnimMode ||
aMode == imgIContainer::kLoopOnceAnimMode, "Wrong Animation Mode is being set!");
// Image animation mode cannot be changed when rendering to a printer.
if (!IsDynamic())
return;
// Now walk the content tree and set the animation mode
// on all the images.
if (mShell != nullptr) {
nsIDocument *doc = mShell->GetDocument();
if (doc) {
doc->StyleImageLoader()->SetAnimationMode(aMode);
Element *rootElement = doc->GetRootElement();
if (rootElement) {
SetImgAnimations(rootElement, aMode);
}
SetSMILAnimations(doc, aMode, mImageAnimationMode);
}
}
mImageAnimationMode = aMode;
}
already_AddRefed<nsAtom>
nsPresContext::GetContentLanguage() const
{
nsAutoString language;
Document()->GetContentLanguage(language);
language.StripWhitespace();
// Content-Language may be a comma-separated list of language codes,
// in which case the HTML5 spec says to treat it as unknown
if (!language.IsEmpty() &&
!language.Contains(char16_t(','))) {
return NS_Atomize(language);
// NOTE: This does *not* count as an explicit language; in other
// words, it doesn't trigger language-specific hyphenation.
}
return nullptr;
}
void
nsPresContext::UpdateEffectiveTextZoom()
{
float newZoom = mSystemFontScale * mTextZoom;
float minZoom = nsLayoutUtils::MinZoom();
float maxZoom = nsLayoutUtils::MaxZoom();
if (newZoom < minZoom) {
newZoom = minZoom;
} else if (newZoom > maxZoom) {
newZoom = maxZoom;
}
mEffectiveTextZoom = newZoom;
// In case of servo, stylist.device might have already generated the default
// computed values with the previous effective text zoom value even if the
// pres shell has not initialized yet.
if (mDocument->IsStyledByServo() || HasCachedStyleData()) {
// Media queries could have changed, since we changed the meaning
// of 'em' units in them.
MediaFeatureValuesChanged(eRestyle_ForceDescendants,
NS_STYLE_HINT_REFLOW);
}
}
float
nsPresContext::GetDeviceFullZoom()
{
return mDeviceContext->GetFullZoom();
}
void
nsPresContext::SetFullZoom(float aZoom)
{
if (!mShell || mFullZoom == aZoom) {
return;
}
// Re-fetch the view manager's window dimensions in case there's a deferred
// resize which hasn't affected our mVisibleArea yet
nscoord oldWidthAppUnits, oldHeightAppUnits;
mShell->GetViewManager()->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
float oldWidthDevPixels = oldWidthAppUnits / float(mCurAppUnitsPerDevPixel);
float oldHeightDevPixels = oldHeightAppUnits / float(mCurAppUnitsPerDevPixel);
mDeviceContext->SetFullZoom(aZoom);
NS_ASSERTION(!mSuppressResizeReflow, "two zooms happening at the same time? impossible!");
mSuppressResizeReflow = true;
mFullZoom = aZoom;
mShell->GetViewManager()->
SetWindowDimensions(NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
AppUnitsPerDevPixelChanged();
mSuppressResizeReflow = false;
}
void
nsPresContext::SetOverrideDPPX(float aDPPX)
{
// SetOverrideDPPX is called during navigations, including history
// traversals. In that case, it's typically called with our current value,
// and we don't need to actually do anything.
if (aDPPX != mOverrideDPPX) {
mOverrideDPPX = aDPPX;
if (HasCachedStyleData()) {
MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
}
}
}
gfxSize
nsPresContext::ScreenSizeInchesForFontInflation(bool* aChanged)
{
if (aChanged) {
*aChanged = false;
}
nsDeviceContext *dx = DeviceContext();
nsRect clientRect;
dx->GetClientRect(clientRect); // FIXME: GetClientRect looks expensive
float unitsPerInch = dx->AppUnitsPerPhysicalInch();
gfxSize deviceSizeInches(float(clientRect.width) / unitsPerInch,
float(clientRect.height) / unitsPerInch);
if (mLastFontInflationScreenSize == gfxSize(-1.0, -1.0)) {
mLastFontInflationScreenSize = deviceSizeInches;
}
if (deviceSizeInches != mLastFontInflationScreenSize && aChanged) {
*aChanged = true;
mLastFontInflationScreenSize = deviceSizeInches;
}
return deviceSizeInches;
}
static bool
CheckOverflow(const nsStyleDisplay* aDisplay, ScrollbarStyles* aStyles)
{
if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE &&
aDisplay->mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_AUTO &&
aDisplay->mScrollSnapTypeX == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
aDisplay->mScrollSnapTypeY == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
aDisplay->mScrollSnapPointsX == nsStyleCoord(eStyleUnit_None) &&
aDisplay->mScrollSnapPointsY == nsStyleCoord(eStyleUnit_None) &&
!aDisplay->mScrollSnapDestination.mXPosition.mHasPercent &&
!aDisplay->mScrollSnapDestination.mYPosition.mHasPercent &&
aDisplay->mScrollSnapDestination.mXPosition.mLength == 0 &&
aDisplay->mScrollSnapDestination.mYPosition.mLength == 0) {
return false;
}
if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_CLIP) {
*aStyles = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
NS_STYLE_OVERFLOW_HIDDEN, aDisplay);
} else {
*aStyles = ScrollbarStyles(aDisplay);
}
return true;
}
static Element*
GetPropagatedScrollbarStylesForViewport(nsPresContext* aPresContext,
ScrollbarStyles *aStyles)
{
nsIDocument* document = aPresContext->Document();
Element* docElement = document->GetRootElement();
// docElement might be null if we're doing this after removing it.
if (!docElement) {
return nullptr;
}
// Check the style on the document root element
StyleSetHandle styleSet = aPresContext->StyleSet();
RefPtr<nsStyleContext> rootStyle =
styleSet->ResolveStyleFor(docElement, nullptr, LazyComputeBehavior::Allow);
if (CheckOverflow(rootStyle->StyleDisplay(), aStyles)) {
// tell caller we stole the overflow style from the root element
return docElement;
}
// Don't look in the BODY for non-HTML documents or HTML documents
// with non-HTML roots.
// XXX this should be earlier; we shouldn't even look at the document root
// for non-HTML documents. Fix this once we support explicit CSS styling
// of the viewport
// XXX what about XHTML?
nsHTMLDocument* htmlDoc = document->AsHTMLDocument();
if (!htmlDoc || !docElement->IsHTMLElement()) {
return nullptr;
}
Element* bodyElement = htmlDoc->GetBodyElement();
if (!bodyElement) {
// No body, nothing to do here.
return nullptr;
}
MOZ_ASSERT(bodyElement->IsHTMLElement(nsGkAtoms::body),
"GetBodyElement returned something bogus");
RefPtr<nsStyleContext> bodyStyle =
styleSet->ResolveStyleFor(bodyElement, rootStyle,
LazyComputeBehavior::Allow);
if (CheckOverflow(bodyStyle->StyleDisplay(), aStyles)) {
// tell caller we stole the overflow style from the body element
return bodyElement;
}
return nullptr;
}
Element*
nsPresContext::UpdateViewportScrollbarStylesOverride()
{
// Start off with our default styles, and then update them as needed.
mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_AUTO,
NS_STYLE_OVERFLOW_AUTO);
mViewportScrollbarOverrideElement = nullptr;
// Don't propagate the scrollbar state in printing or print preview.
if (!IsPaginated()) {
mViewportScrollbarOverrideElement =
GetPropagatedScrollbarStylesForViewport(this, &mViewportStyleScrollbar);
}
nsIDocument* document = Document();
if (Element* fullscreenElement = document->GetFullscreenElement()) {
// If the document is in fullscreen, but the fullscreen element is
// not the root element, we should explicitly suppress the scrollbar
// here. Note that, we still need to return the original element
// the styles are from, so that the state of those elements is not
// affected across fullscreen change.
if (fullscreenElement != document->GetRootElement() &&
fullscreenElement != mViewportScrollbarOverrideElement) {
mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
NS_STYLE_OVERFLOW_HIDDEN);
}
}
return mViewportScrollbarOverrideElement;
}
bool
nsPresContext::ElementWouldPropagateScrollbarStyles(Element* aElement)
{
MOZ_ASSERT(IsPaginated(), "Should only be called on paginated contexts");
if (aElement->GetParent() && !aElement->IsHTMLElement(nsGkAtoms::body)) {
// We certainly won't be propagating from this element.
return false;
}
// Go ahead and just call GetPropagatedScrollbarStylesForViewport, but update
// a dummy ScrollbarStyles we don't care about. It'll do a bit of extra work,
// but saves us having to have more complicated code or more code duplication;
// in practice we will make this call quite rarely, because we checked for all
// the common cases above.
ScrollbarStyles dummy(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO);
return GetPropagatedScrollbarStylesForViewport(this, &dummy) == aElement;
}
void
nsPresContext::SetContainer(nsIDocShell* aDocShell)
{
if (aDocShell) {
NS_ASSERTION(!(mContainer && mNeedsPrefUpdate),
"Should only need pref update if mContainer is null.");
mContainer = static_cast<nsDocShell*>(aDocShell);
if (mNeedsPrefUpdate) {
if (!mPrefChangedTimer) {
mPrefChangedTimer = CreateTimer(PrefChangedUpdateTimerCallback,
"PrefChangedUpdateTimerCallback", 0);
}
mNeedsPrefUpdate = false;
}
} else {
mContainer = WeakPtr<nsDocShell>();
}
UpdateIsChrome();
if (mContainer) {
GetDocumentColorPreferences();
}
}
nsISupports*
nsPresContext::GetContainerWeak() const
{
return static_cast<nsIDocShell*>(mContainer);
}
nsIDocShell*
nsPresContext::GetDocShell() const
{
return mContainer;
}
/* virtual */ void
nsPresContext::Detach()
{
SetContainer(nullptr);
SetLinkHandler(nullptr);
}
bool
nsPresContext::BidiEnabled() const
{
return Document()->GetBidiEnabled();
}
void
nsPresContext::SetBidiEnabled() const
{
if (mShell) {
nsIDocument *doc = mShell->GetDocument();
if (doc) {
doc->SetBidiEnabled();
}
}
}
void
nsPresContext::SetBidi(uint32_t aSource)
{
// Don't do all this stuff unless the options have changed.
if (aSource == GetBidi()) {
return;
}
Document()->SetBidiOptions(aSource);
if (IBMBIDI_TEXTDIRECTION_RTL == GET_BIDI_OPTION_DIRECTION(aSource)
|| IBMBIDI_NUMERAL_HINDI == GET_BIDI_OPTION_NUMERAL(aSource)) {
SetBidiEnabled();
}
if (IBMBIDI_TEXTTYPE_VISUAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
SetVisualMode(true);
}
else if (IBMBIDI_TEXTTYPE_LOGICAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
SetVisualMode(false);
}
else {
nsIDocument* doc = mShell->GetDocument();
if (doc) {
SetVisualMode(IsVisualCharset(doc->GetDocumentCharacterSet()));
}
}
}
uint32_t
nsPresContext::GetBidi() const
{
return Document()->GetBidiOptions();
}
bool
nsPresContext::IsTopLevelWindowInactive()
{
return Document()->IsTopLevelWindowInactive();
}
void
nsPresContext::RecordInteractionTime(InteractionType aType,
const TimeStamp& aTimeStamp)
{
if (!mInteractionTimeEnabled || aTimeStamp.IsNull()) {
return;
}
// Array of references to the member variable of each time stamp
// for the different interaction types, keyed by InteractionType.
TimeStamp nsPresContext::*interactionTimes[] = {
&nsPresContext::mFirstClickTime,
&nsPresContext::mFirstKeyTime,
&nsPresContext::mFirstMouseMoveTime,
&nsPresContext::mFirstScrollTime
};
// Array of histogram IDs for the different interaction types,
// keyed by InteractionType.
Telemetry::HistogramID histogramIds[] = {
Telemetry::TIME_TO_FIRST_CLICK_MS,
Telemetry::TIME_TO_FIRST_KEY_INPUT_MS,
Telemetry::TIME_TO_FIRST_MOUSE_MOVE_MS,
Telemetry::TIME_TO_FIRST_SCROLL_MS
};
TimeStamp& interactionTime = this->*(
interactionTimes[static_cast<uint32_t>(aType)]);
if (!interactionTime.IsNull()) {
// We have already recorded an interaction time.
return;
}
// Record the interaction time if it occurs after the first paint
// of the top level content document.
nsPresContext* topContentPresContext =
GetToplevelContentDocumentPresContext();
if (!topContentPresContext) {
// There is no top content pres context so we don't care
// about the interaction time. Record a value anyways to avoid
// trying to find the top content pres context in future interactions.
interactionTime = TimeStamp::Now();
return;
}
if (topContentPresContext->mFirstNonBlankPaintTime.IsNull() ||
topContentPresContext->mFirstNonBlankPaintTime > aTimeStamp) {
// Top content pres context has not had a non-blank paint yet
// or the event timestamp is before the first non-blank paint,
// so don't record interaction time.
return;
}
// Check if we are recording the first of any of the interaction types.
bool isFirstInteraction = true;
for (TimeStamp nsPresContext::* memberPtr : interactionTimes) {
TimeStamp& timeStamp = this->*(memberPtr);
if (!timeStamp.IsNull()) {
isFirstInteraction = false;
break;
}
}
interactionTime = TimeStamp::Now();
// Only the top level content pres context reports first interaction
// time to telemetry (if it hasn't already done so).
if (this == topContentPresContext) {
if (Telemetry::CanRecordExtended()) {
double millis =
(interactionTime - mFirstNonBlankPaintTime).ToMilliseconds();
Telemetry::Accumulate(histogramIds[static_cast<uint32_t>(aType)],
millis);
if (isFirstInteraction) {
Telemetry::Accumulate(Telemetry::TIME_TO_FIRST_INTERACTION_MS, millis);
}
}
} else {
topContentPresContext->RecordInteractionTime(aType, aTimeStamp);
}
}
nsITheme*
nsPresContext::GetTheme()
{
if (!sNoTheme && !mTheme) {
mTheme = do_GetService("@mozilla.org/chrome/chrome-native-theme;1");
if (!mTheme)
sNoTheme = true;
}
return mTheme;
}
void
nsPresContext::ThemeChanged()
{
if (!mPendingThemeChanged) {
sLookAndFeelChanged = true;
sThemeChanged = true;
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::ThemeChangedInternal",
this,
&nsPresContext::ThemeChangedInternal);
nsresult rv = Document()->Dispatch(TaskCategory::Other,
ev.forget());
if (NS_SUCCEEDED(rv)) {
mPendingThemeChanged = true;
}
}
}
static bool
NotifyThemeChanged(TabParent* aTabParent, void* aArg)
{
aTabParent->ThemeChanged();
return false;
}
void
nsPresContext::ThemeChangedInternal()
{
mPendingThemeChanged = false;
// Tell the theme that it changed, so it can flush any handles to stale theme
// data.
if (mTheme && sThemeChanged) {
mTheme->ThemeChanged();
sThemeChanged = false;
}
if (sLookAndFeelChanged) {
// Clear all cached LookAndFeel colors.
LookAndFeel::Refresh();
sLookAndFeelChanged = false;
// Vector images (SVG) may be using theme colors so we discard all cached
// surfaces. (We could add a vector image only version of DiscardAll, but
// in bug 940625 we decided theme changes are rare enough not to bother.)
image::SurfaceCacheUtils::DiscardAll();
}
RefreshSystemMetrics();
// Recursively notify all remote leaf descendants that the
// system theme has changed.
nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
NotifyThemeChanged, nullptr);
}
void
nsPresContext::SysColorChanged()
{
if (!mPendingSysColorChanged) {
sLookAndFeelChanged = true;
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::SysColorChangedInternal",
this,
&nsPresContext::SysColorChangedInternal);
nsresult rv = Document()->Dispatch(TaskCategory::Other,
ev.forget());
if (NS_SUCCEEDED(rv)) {
mPendingSysColorChanged = true;
}
}
}
void
nsPresContext::SysColorChangedInternal()
{
mPendingSysColorChanged = false;
if (sLookAndFeelChanged) {
// Don't use the cached values for the system colors
LookAndFeel::Refresh();
sLookAndFeelChanged = false;
}
// Invalidate cached '-moz-windows-accent-color-applies' media query:
RefreshSystemMetrics();
// Reset default background and foreground colors for the document since
// they may be using system colors
GetDocumentColorPreferences();
// The system color values are computed to colors in the style data,
// so normal style data comparison is sufficient here.
RebuildAllStyleData(nsChangeHint(0), nsRestyleHint(0));
}
void
nsPresContext::RefreshSystemMetrics()
{
// This will force the system metrics to be generated the next time they're
// used.
nsMediaFeatures::FreeSystemMetrics();
// Changes to system metrics can change media queries on them.
//
// Changes in theme can change system colors (whose changes are
// properly reflected in computed style data), system fonts (whose
// changes are not), and -moz-appearance (whose changes likewise are
// not), so we need to recascade for the first, and reflow for the rest.
MediaFeatureValuesChanged(eRestyle_ForceDescendants, NS_STYLE_HINT_REFLOW);
}
void
nsPresContext::UIResolutionChanged()
{
if (!mPendingUIResolutionChanged) {
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::UIResolutionChangedInternal",
this,
&nsPresContext::UIResolutionChangedInternal);
nsresult rv =
Document()->Dispatch(TaskCategory::Other, ev.forget());
if (NS_SUCCEEDED(rv)) {
mPendingUIResolutionChanged = true;
}
}
}
void
nsPresContext::UIResolutionChangedSync()
{
if (!mPendingUIResolutionChanged) {
mPendingUIResolutionChanged = true;
UIResolutionChangedInternalScale(0.0);
}
}
/*static*/ bool
nsPresContext::UIResolutionChangedSubdocumentCallback(nsIDocument* aDocument,
void* aData)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
nsPresContext* pc = shell->GetPresContext();
if (pc) {
// For subdocuments, we want to apply the parent's scale, because there
// are cases where the subdoc's device context is connected to a widget
// that has an out-of-date resolution (it's on a different screen, but
// currently hidden, and will not be updated until shown): bug 1249279.
double scale = *static_cast<double*>(aData);
pc->UIResolutionChangedInternalScale(scale);
}
}
return true;
}
static void
NotifyTabUIResolutionChanged(TabParent* aTab, void *aArg)
{
aTab->UIResolutionChanged();
}
static void
NotifyChildrenUIResolutionChanged(nsPIDOMWindowOuter* aWindow)
{
nsCOMPtr<nsIDocument> doc = aWindow->GetExtantDoc();
RefPtr<nsPIWindowRoot> topLevelWin = nsContentUtils::GetWindowRoot(doc);
if (!topLevelWin) {
return;
}
topLevelWin->EnumerateBrowsers(NotifyTabUIResolutionChanged, nullptr);
}
void
nsPresContext::UIResolutionChangedInternal()
{
UIResolutionChangedInternalScale(0.0);
}
void
nsPresContext::UIResolutionChangedInternalScale(double aScale)
{
mPendingUIResolutionChanged = false;
mDeviceContext->CheckDPIChange(&aScale);
if (mCurAppUnitsPerDevPixel != AppUnitsPerDevPixel()) {
AppUnitsPerDevPixelChanged();
}
// Recursively notify all remote leaf descendants of the change.
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
NotifyChildrenUIResolutionChanged(window);
}
mDocument->EnumerateSubDocuments(UIResolutionChangedSubdocumentCallback,
&aScale);
}
void
nsPresContext::EmulateMedium(const nsAString& aMediaType)
{
nsAtom* previousMedium = Medium();
mIsEmulatingMedia = true;
nsAutoString mediaType;
nsContentUtils::ASCIIToLower(aMediaType, mediaType);
mMediaEmulated = NS_Atomize(mediaType);
if (mMediaEmulated != previousMedium && mShell) {
MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
}
}
void nsPresContext::StopEmulatingMedium()
{
nsAtom* previousMedium = Medium();
mIsEmulatingMedia = false;
if (Medium() != previousMedium) {
MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
}
}
void
nsPresContext::ForceCacheLang(nsAtom *aLanguage)
{
// force it to be cached
GetDefaultFont(kPresContext_DefaultVariableFont_ID, aLanguage);
mLanguagesUsed.PutEntry(aLanguage);
}
void
nsPresContext::CacheAllLangs()
{
if (mFontGroupCacheDirty) {
RefPtr<nsAtom> thisLang = nsStyleFont::GetLanguage(this);
GetDefaultFont(kPresContext_DefaultVariableFont_ID, thisLang.get());
GetDefaultFont(kPresContext_DefaultVariableFont_ID, nsGkAtoms::x_math);
// https://bugzilla.mozilla.org/show_bug.cgi?id=1362599#c12
GetDefaultFont(kPresContext_DefaultVariableFont_ID, nsGkAtoms::Unicode);
for (auto iter = mLanguagesUsed.Iter(); !iter.Done(); iter.Next()) {
GetDefaultFont(kPresContext_DefaultVariableFont_ID, iter.Get()->GetKey());
}
}
mFontGroupCacheDirty = false;
}
void
nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint,
nsRestyleHint aRestyleHint)
{
if (!mShell) {
// We must have been torn down. Nothing to do here.
return;
}
mUsesRootEMUnits = false;
mUsesExChUnits = false;
if (nsStyleSet* styleSet = mShell->StyleSet()->GetAsGecko()) {
styleSet->SetUsesViewportUnits(false);
}
mDocument->RebuildUserFontSet();
RebuildCounterStyles();
RebuildFontFeatureValues();
RestyleManager()->RebuildAllStyleData(aExtraHint, aRestyleHint);
}
void
nsPresContext::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
nsRestyleHint aRestyleHint)
{
if (!mShell) {
// We must have been torn down. Nothing to do here.
return;
}
RestyleManager()->PostRebuildAllStyleDataEvent(aExtraHint, aRestyleHint);
}
struct MediaFeatureHints
{
nsRestyleHint restyleHint;
nsChangeHint changeHint;
};
static bool
MediaFeatureValuesChangedAllDocumentsCallback(nsIDocument* aDocument, void* aHints)
{
MediaFeatureHints* hints = static_cast<MediaFeatureHints*>(aHints);
if (nsIPresShell* shell = aDocument->GetShell()) {
if (nsPresContext* pc = shell->GetPresContext()) {
pc->MediaFeatureValuesChangedAllDocuments(hints->restyleHint,
hints->changeHint);
}
}
return true;
}
void
nsPresContext::MediaFeatureValuesChangedAllDocuments(nsRestyleHint aRestyleHint,
nsChangeHint aChangeHint)
{
MediaFeatureValuesChanged(aRestyleHint, aChangeHint);
MediaFeatureHints hints = {
aRestyleHint,
aChangeHint
};
mDocument->EnumerateSubDocuments(MediaFeatureValuesChangedAllDocumentsCallback,
&hints);
}
void
nsPresContext::MediaFeatureValuesChanged(nsRestyleHint aRestyleHint,
nsChangeHint aChangeHint)
{
mPendingMediaFeatureValuesChanged = false;
// MediumFeaturesChanged updates the applied rules, so it always gets called.
if (mShell) {
aRestyleHint |= mShell->
StyleSet()->MediumFeaturesChanged(mPendingViewportChange);
}
if (aRestyleHint || aChangeHint) {
RebuildAllStyleData(aChangeHint, aRestyleHint);
}
mPendingViewportChange = false;
if (!mShell || !mShell->DidInitialize()) {
return;
}
if (mDocument->IsBeingUsedAsImage()) {
MOZ_ASSERT(mDocument->MediaQueryLists().isEmpty());
return;
}
mDocument->NotifyMediaFeatureValuesChanged();
MOZ_DIAGNOSTIC_ASSERT(nsContentUtils::IsSafeToRunScript());
// Media query list listeners should be notified from a queued task
// (in HTML5 terms), although we also want to notify them on certain
// flushes. (We're already running off an event.)
//
// Note that we do this after the new style from media queries in
// style sheets has been computed.
if (!mDocument->MediaQueryLists().isEmpty()) {
// We build a list of all the notifications we're going to send
// before we send any of them.
// Copy pointers to all the lists into a new array, in case one of our
// notifications modifies the list.
nsTArray<RefPtr<mozilla::dom::MediaQueryList>> localMediaQueryLists;
for (auto* mql : mDocument->MediaQueryLists()) {
localMediaQueryLists.AppendElement(mql);
}
// Now iterate our local array of the lists.
for (const auto& mql : localMediaQueryLists) {
nsAutoMicroTask mt;
mql->MaybeNotify();
}
}
}
void
nsPresContext::PostMediaFeatureValuesChangedEvent()
{
// FIXME: We should probably replace this event with use of
// nsRefreshDriver::AddStyleFlushObserver (except the pres shell would
// need to track whether it's been added).
if (!mPendingMediaFeatureValuesChanged && mShell) {
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::HandleMediaFeatureValuesChangedEvent",
this, &nsPresContext::HandleMediaFeatureValuesChangedEvent);
nsresult rv =
Document()->Dispatch(TaskCategory::Other, ev.forget());
if (NS_SUCCEEDED(rv)) {
mPendingMediaFeatureValuesChanged = true;
mShell->SetNeedStyleFlush();
}
}
}
void
nsPresContext::HandleMediaFeatureValuesChangedEvent()
{
// Null-check mShell in case the shell has been destroyed (and the
// event is the only thing holding the pres context alive).
if (mPendingMediaFeatureValuesChanged && mShell) {
MediaFeatureValuesChanged(nsRestyleHint(0));
}
}
static bool
NotifyTabSizeModeChanged(TabParent* aTab, void* aArg)
{
nsSizeMode* sizeMode = static_cast<nsSizeMode*>(aArg);
aTab->SizeModeChanged(*sizeMode);
return false;
}
void
nsPresContext::SizeModeChanged(nsSizeMode aSizeMode)
{
if (HasCachedStyleData()) {
nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
NotifyTabSizeModeChanged,
&aSizeMode);
MediaFeatureValuesChangedAllDocuments(nsRestyleHint(0));
}
}
nsCompatibility
nsPresContext::CompatibilityMode() const
{
return Document()->GetCompatibilityMode();
}
void
nsPresContext::SetPaginatedScrolling(bool aPaginated)
{
if (mType == eContext_PrintPreview || mType == eContext_PageLayout)
mCanPaginatedScroll = aPaginated;
}
void
nsPresContext::SetPrintSettings(nsIPrintSettings *aPrintSettings)
{
if (mMedium == nsGkAtoms::print)
mPrintSettings = aPrintSettings;
}
bool
nsPresContext::EnsureVisible()
{
nsCOMPtr<nsIDocShell> docShell(mContainer);
if (docShell) {
nsCOMPtr<nsIContentViewer> cv;
docShell->GetContentViewer(getter_AddRefs(cv));
// Make sure this is the content viewer we belong with
if (cv) {
RefPtr<nsPresContext> currentPresContext;
cv->GetPresContext(getter_AddRefs(currentPresContext));
if (currentPresContext == this) {
// OK, this is us. We want to call Show() on the content viewer.
nsresult result = cv->Show();
if (NS_SUCCEEDED(result)) {
return true;
}
}
}
}
return false;
}
#ifdef MOZ_REFLOW_PERF
void
nsPresContext::CountReflows(const char * aName, nsIFrame * aFrame)
{
if (mShell) {
mShell->CountReflows(aName, aFrame);
}
}
#endif
void
nsPresContext::UpdateIsChrome()
{
mIsChrome = mContainer &&
nsIDocShellTreeItem::typeChrome == mContainer->ItemType();
}
bool
nsPresContext::HasAuthorSpecifiedRules(const nsIFrame* aFrame,
uint32_t aRuleTypeMask) const
{
if (auto* geckoStyleContext = aFrame->StyleContext()->GetAsGecko()) {
return
nsRuleNode::HasAuthorSpecifiedRules(geckoStyleContext,
aRuleTypeMask,
UseDocumentColors());
}
Element* elem = aFrame->GetContent()->AsElement();
// We need to handle non-generated content pseudos too, so we use
// the parent of generated content pseudo to be consistent.
if (elem->GetPseudoElementType() != CSSPseudoElementType::NotPseudo) {
MOZ_ASSERT(elem->GetParent(), "Pseudo element has no parent element?");
elem = elem->GetParent()->AsElement();
}
if (MOZ_UNLIKELY(!elem->HasServoData())) {
// Probably shouldn't happen, but does. See bug 1387953
return false;
}
nsStyleContext* styleContext = aFrame->StyleContext();
CSSPseudoElementType pseudoType = styleContext->GetPseudoType();
// Anonymous boxes are more complicated, and we just assume that they
// cannot have any author-specified rules here.
if (pseudoType == CSSPseudoElementType::InheritingAnonBox ||
pseudoType == CSSPseudoElementType::NonInheritingAnonBox) {
return false;
}
return Servo_HasAuthorSpecifiedRules(styleContext->AsServo(),
elem, pseudoType,
aRuleTypeMask,
UseDocumentColors());
}
gfxUserFontSet*
nsPresContext::GetUserFontSet(bool aFlushUserFontSet)
{
return mDocument->GetUserFontSet(aFlushUserFontSet);
}
void
nsPresContext::UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont)
{
if (!mShell)
return;
// Note: this method is called without a font when rules in the userfont set
// are updated, which may occur during reflow as a result of the lazy
// initialization of the userfont set. It would be better to avoid a full
// restyle but until this method is only called outside of reflow, schedule a
// full restyle in these cases.
if (!aUpdatedFont) {
PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, eRestyle_ForceDescendants);
return;
}
// Special case - if either the 'ex' or 'ch' units are used, these
// depend upon font metrics. Updating this information requires
// rebuilding the rule tree from the top, avoiding the reuse of cached
// data even when no style rules have changed.
if (UsesExChUnits()) {
PostRebuildAllStyleDataEvent(nsChangeHint(0), eRestyle_ForceDescendants);
}
// Iterate over the frame tree looking for frames associated with the
// downloadable font family in question. If a frame's nsStyleFont has
// the name, check the font group associated with the metrics to see if
// it contains that specific font (i.e. the one chosen within the family
// given the weight, width, and slant from the nsStyleFont). If it does,
// mark that frame dirty and skip inspecting its descendants.
nsIFrame* root = mShell->GetRootFrame();
if (root) {
nsFontFaceUtils::MarkDirtyForFontChange(root, aUpdatedFont);
}
}
class CounterStyleCleaner : public nsAPostRefreshObserver
{
public:
CounterStyleCleaner(nsRefreshDriver* aRefreshDriver,
CounterStyleManager* aCounterStyleManager)
: mRefreshDriver(aRefreshDriver)
, mCounterStyleManager(aCounterStyleManager)
{
}
virtual ~CounterStyleCleaner() {}
void DidRefresh() final override
{
mRefreshDriver->RemovePostRefreshObserver(this);
mCounterStyleManager->CleanRetiredStyles();
delete this;
}
private:
RefPtr<nsRefreshDriver> mRefreshDriver;
RefPtr<CounterStyleManager> mCounterStyleManager;
};
void
nsPresContext::FlushCounterStyles()
{
if (!mShell) {
return; // we've been torn down
}
if (mCounterStyleManager->IsInitial()) {
// Still in its initial state, no need to clean.
return;
}
if (mCounterStylesDirty) {
bool changed = mCounterStyleManager->NotifyRuleChanged();
if (changed) {
PresShell()->NotifyCounterStylesAreDirty();
PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW,
eRestyle_ForceDescendants);
RefreshDriver()->AddPostRefreshObserver(
new CounterStyleCleaner(RefreshDriver(), mCounterStyleManager));
}
mCounterStylesDirty = false;
}
}
void
nsPresContext::RebuildCounterStyles()
{
if (mCounterStyleManager->IsInitial()) {
// Still in its initial state, no need to reset.
return;
}
mCounterStylesDirty = true;
if (mShell) {
mShell->SetNeedStyleFlush();
}
if (!mPostedFlushCounterStyles) {
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::HandleRebuildCounterStyles",
this, &nsPresContext::HandleRebuildCounterStyles);
nsresult rv =
Document()->Dispatch(TaskCategory::Other, ev.forget());
if (NS_SUCCEEDED(rv)) {
mPostedFlushCounterStyles = true;
}
}
}
void
nsPresContext::NotifyMissingFonts()
{
if (mMissingFonts) {
mMissingFonts->Flush();
}
}
void
nsPresContext::EnsureSafeToHandOutCSSRules()
{
if (!mShell->StyleSet()->EnsureUniqueInnerOnCSSSheets()) {
// Nothing to do.
return;
}
RebuildAllStyleData(nsChangeHint(0), eRestyle_Subtree);
}
void
nsPresContext::FireDOMPaintEvent(nsTArray<nsRect>* aList, uint64_t aTransactionId,
mozilla::TimeStamp aTimeStamp /* = mozilla::TimeStamp() */)
{
nsPIDOMWindowInner* ourWindow = mDocument->GetInnerWindow();
if (!ourWindow)
return;
nsCOMPtr<EventTarget> dispatchTarget = do_QueryInterface(ourWindow);
nsCOMPtr<EventTarget> eventTarget = dispatchTarget;
if (!IsChrome() && !mSendAfterPaintToContent) {
// Don't tell the window about this event, it should not know that
// something happened in a subdocument. Tell only the chrome event handler.
// (Events sent to the window get propagated to the chrome event handler
// automatically.)
dispatchTarget = do_QueryInterface(ourWindow->GetParentTarget());
if (!dispatchTarget) {
return;
}
}
if (aTimeStamp.IsNull()) {
aTimeStamp = mozilla::TimeStamp::Now();
}
DOMHighResTimeStamp timeStamp = 0;
if (ourWindow) {
mozilla::dom::Performance* perf = ourWindow->GetPerformance();
if (perf) {
timeStamp = perf->GetDOMTiming()->TimeStampToDOMHighRes(aTimeStamp);
}
}
// Events sent to the window get propagated to the chrome event handler
// automatically.
//
// This will empty our list in case dispatching the event causes more damage
// (hopefully it won't, or we're likely to get an infinite loop! At least
// it won't be blocking app execution though).
RefPtr<NotifyPaintEvent> event =
NS_NewDOMNotifyPaintEvent(eventTarget, this, nullptr, eAfterPaint, aList,
aTransactionId, timeStamp);
// Even if we're not telling the window about the event (so eventTarget is
// the chrome event handler, not the window), the window is still
// logically the event target.
event->SetTarget(eventTarget);
event->SetTrusted(true);
EventDispatcher::DispatchDOMEvent(dispatchTarget, nullptr,
static_cast<Event*>(event), this, nullptr);
}
static bool
MayHavePaintEventListenerSubdocumentCallback(nsIDocument* aDocument, void* aData)
{
bool *result = static_cast<bool*>(aData);
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
nsPresContext* pc = shell->GetPresContext();
if (pc) {
*result = pc->MayHavePaintEventListenerInSubDocument();
// If we found a paint event listener, then we can stop enumerating
// sub documents.
return !*result;
}
}
return true;
}
static bool
MayHavePaintEventListener(nsPIDOMWindowInner* aInnerWindow)
{
if (!aInnerWindow)
return false;
if (aInnerWindow->HasPaintEventListeners())
return true;
EventTarget* parentTarget = aInnerWindow->GetParentTarget();
if (!parentTarget)
return false;
EventListenerManager* manager = nullptr;
if ((manager = parentTarget->GetExistingListenerManager()) &&
manager->MayHavePaintEventListener()) {
return true;
}
nsCOMPtr<nsINode> node;
if (parentTarget != aInnerWindow->GetChromeEventHandler()) {
nsCOMPtr<nsIInProcessContentFrameMessageManager> mm =
do_QueryInterface(parentTarget);
if (mm) {
node = mm->GetOwnerContent();
}
}
if (!node) {
node = do_QueryInterface(parentTarget);
}
if (node)
return MayHavePaintEventListener(node->OwnerDoc()->GetInnerWindow());
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentTarget);
if (window)
return MayHavePaintEventListener(window);
nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(parentTarget);
EventTarget* tabChildGlobal;
return root &&
(tabChildGlobal = root->GetParentTarget()) &&
(manager = tabChildGlobal->GetExistingListenerManager()) &&
manager->MayHavePaintEventListener();
}
bool
nsPresContext::MayHavePaintEventListener()
{
return ::MayHavePaintEventListener(mDocument->GetInnerWindow());
}
bool
nsPresContext::MayHavePaintEventListenerInSubDocument()
{
if (MayHavePaintEventListener()) {
return true;
}
bool result = false;
mDocument->EnumerateSubDocuments(MayHavePaintEventListenerSubdocumentCallback, &result);
return result;
}
void
nsPresContext::NotifyInvalidation(uint64_t aTransactionId, const nsIntRect& aRect)
{
// Prevent values from overflow after DevPixelsToAppUnits().
//
// DevPixelsTopAppUnits() will multiple a factor (60) to the value,
// it may make the result value over the edge (overflow) of max or
// min value of int32_t. Compute the max sized dev pixel rect that
// we can support and intersect with it.
nsIntRect clampedRect = nsIntRect::MaxIntRect();
clampedRect.ScaleInverseRoundIn(AppUnitsPerDevPixel());
clampedRect = clampedRect.Intersect(aRect);
nsRect rect(DevPixelsToAppUnits(clampedRect.x),
DevPixelsToAppUnits(clampedRect.y),
DevPixelsToAppUnits(clampedRect.width),
DevPixelsToAppUnits(clampedRect.height));
NotifyInvalidation(aTransactionId, rect);
}
void
nsPresContext::NotifyInvalidation(uint64_t aTransactionId, const nsRect& aRect)
{
MOZ_ASSERT(GetContainerWeak(), "Invalidation in detached pres context");
// If there is no paint event listener, then we don't need to fire
// the asynchronous event. We don't even need to record invalidation.
// MayHavePaintEventListener is pretty cheap and we could make it
// even cheaper by providing a more efficient
// nsPIDOMWindow::GetListenerManager.
nsPresContext* pc;
for (pc = this; pc; pc = pc->GetParentPresContext()) {
if (pc->mFireAfterPaintEvents)
break;
pc->mFireAfterPaintEvents = true;
}
if (!pc) {
nsRootPresContext* rpc = GetRootPresContext();
if (rpc) {
rpc->EnsureEventualDidPaintEvent(aTransactionId);
}
}
TransactionInvalidations* transaction = nullptr;
for (TransactionInvalidations& t : mTransactions) {
if (t.mTransactionId == aTransactionId) {
transaction = &t;
break;
}
}
if (!transaction) {
transaction = mTransactions.AppendElement();
transaction->mTransactionId = aTransactionId;
}
transaction->mInvalidations.AppendElement(aRect);
}
/* static */ void
nsPresContext::NotifySubDocInvalidation(ContainerLayer* aContainer,
const nsIntRegion* aRegion)
{
ContainerLayerPresContext *data =
static_cast<ContainerLayerPresContext*>(
aContainer->GetUserData(&gNotifySubDocInvalidationData));
if (!data) {
return;
}
uint64_t transactionId = aContainer->Manager()->GetLastTransactionId();
IntRect visibleBounds = aContainer->GetVisibleRegion().GetBounds().ToUnknownRect();
if (!aRegion) {
IntRect rect(IntPoint(0, 0), visibleBounds.Size());
data->mPresContext->NotifyInvalidation(transactionId, rect);
return;
}
nsIntPoint topLeft = visibleBounds.TopLeft();
for (auto iter = aRegion->RectIter(); !iter.Done(); iter.Next()) {
nsIntRect rect(iter.Get());
//PresContext coordinate space is relative to the start of our visible
// region. Is this really true? This feels like the wrong way to get the right
// answer.
rect.MoveBy(-topLeft);
data->mPresContext->NotifyInvalidation(transactionId, rect);
}
}
void
nsPresContext::SetNotifySubDocInvalidationData(ContainerLayer* aContainer)
{
ContainerLayerPresContext* pres = new ContainerLayerPresContext;
pres->mPresContext = this;
aContainer->SetUserData(&gNotifySubDocInvalidationData, pres);
}
/* static */ void
nsPresContext::ClearNotifySubDocInvalidationData(ContainerLayer* aContainer)
{
aContainer->SetUserData(&gNotifySubDocInvalidationData, nullptr);
}
struct NotifyDidPaintSubdocumentCallbackClosure {
uint64_t mTransactionId;
const mozilla::TimeStamp& mTimeStamp;
bool mNeedsAnotherDidPaintNotification;
};
/* static */ bool
nsPresContext::NotifyDidPaintSubdocumentCallback(nsIDocument* aDocument, void* aData)
{
NotifyDidPaintSubdocumentCallbackClosure* closure =
static_cast<NotifyDidPaintSubdocumentCallbackClosure*>(aData);
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
nsPresContext* pc = shell->GetPresContext();
if (pc) {
pc->NotifyDidPaintForSubtree(closure->mTransactionId,
closure->mTimeStamp);
if (pc->mFireAfterPaintEvents) {
closure->mNeedsAnotherDidPaintNotification = true;
}
}
}
return true;
}
class DelayedFireDOMPaintEvent : public Runnable {
public:
DelayedFireDOMPaintEvent(
nsPresContext* aPresContext,
nsTArray<nsRect>* aList,
uint64_t aTransactionId,
const mozilla::TimeStamp& aTimeStamp = mozilla::TimeStamp())
: mozilla::Runnable("DelayedFireDOMPaintEvent")
, mPresContext(aPresContext)
, mTransactionId(aTransactionId)
, mTimeStamp(aTimeStamp)
{
MOZ_ASSERT(mPresContext->GetContainerWeak(),
"DOMPaintEvent requested for a detached pres context");
mList.SwapElements(*aList);
}
NS_IMETHOD Run() override
{
// The pres context might have been detached during the delay -
// that's fine, just don't fire the event.
if (mPresContext->GetContainerWeak()) {
mPresContext->FireDOMPaintEvent(&mList, mTransactionId, mTimeStamp);
}
return NS_OK;
}
RefPtr<nsPresContext> mPresContext;
uint64_t mTransactionId;
const mozilla::TimeStamp mTimeStamp;
nsTArray<nsRect> mList;
};
void
nsPresContext::NotifyDidPaintForSubtree(uint64_t aTransactionId,
const mozilla::TimeStamp& aTimeStamp)
{
if (IsRoot()) {
static_cast<nsRootPresContext*>(this)->CancelDidPaintTimers(aTransactionId);
if (!mFireAfterPaintEvents) {
return;
}
}
if (!PresShell()->IsVisible() && !mFireAfterPaintEvents) {
return;
}
// Non-root prescontexts fire MozAfterPaint to all their descendants
// unconditionally, even if no invalidations have been collected. This is
// because we don't want to eat the cost of collecting invalidations for
// every subdocument (which would require putting every subdocument in its
// own layer).
bool sent = false;
uint32_t i = 0;
while (i < mTransactions.Length()) {
if (mTransactions[i].mTransactionId <= aTransactionId) {
nsCOMPtr<nsIRunnable> ev =
new DelayedFireDOMPaintEvent(this, &mTransactions[i].mInvalidations,
mTransactions[i].mTransactionId, aTimeStamp);
nsContentUtils::AddScriptRunner(ev);
sent = true;
mTransactions.RemoveElementAt(i);
} else {
i++;
}
}
if (!sent) {
nsTArray<nsRect> dummy;
nsCOMPtr<nsIRunnable> ev =
new DelayedFireDOMPaintEvent(this, &dummy,
aTransactionId, aTimeStamp);
nsContentUtils::AddScriptRunner(ev);
}
NotifyDidPaintSubdocumentCallbackClosure closure = { aTransactionId, aTimeStamp, false };
mDocument->EnumerateSubDocuments(nsPresContext::NotifyDidPaintSubdocumentCallback, &closure);
if (!closure.mNeedsAnotherDidPaintNotification &&
mTransactions.IsEmpty()) {
// Nothing more to do for the moment.
mFireAfterPaintEvents = false;
}
}
bool
nsPresContext::HasCachedStyleData()
{
if (!mShell) {
return false;
}
nsStyleSet* styleSet = mShell->StyleSet()->GetAsGecko();
if (!styleSet) {
// XXXheycam ServoStyleSets do not use the rule tree, so just assume for now
// that we need to restyle when e.g. dppx changes assuming we're sufficiently
// bootstrapped.
return mShell->DidInitialize();
}
return styleSet->HasCachedStyleData();
}
already_AddRefed<nsITimer>
nsPresContext::CreateTimer(nsTimerCallbackFunc aCallback,
const char* aName,
uint32_t aDelay)
{
nsCOMPtr<nsITimer> timer;
NS_NewTimerWithFuncCallback(getter_AddRefs(timer),
aCallback, this, aDelay,
nsITimer::TYPE_ONE_SHOT,
aName,
Document()->EventTargetFor(TaskCategory::Other));
return timer.forget();
}
static bool sGotInterruptEnv = false;
enum InterruptMode {
ModeRandom,
ModeCounter,
ModeEvent
};
// Controlled by the GECKO_REFLOW_INTERRUPT_MODE env var; allowed values are
// "random" (except on Windows) or "counter". If neither is used, the mode is
// ModeEvent.
static InterruptMode sInterruptMode = ModeEvent;
#ifndef XP_WIN
// Used for the "random" mode. Controlled by the GECKO_REFLOW_INTERRUPT_SEED
// env var.
static uint32_t sInterruptSeed = 1;
#endif
// Used for the "counter" mode. This is the number of unskipped interrupt
// checks that have to happen before we interrupt. Controlled by the
// GECKO_REFLOW_INTERRUPT_FREQUENCY env var.
static uint32_t sInterruptMaxCounter = 10;
// Used for the "counter" mode. This counts up to sInterruptMaxCounter and is
// then reset to 0.
static uint32_t sInterruptCounter;
// Number of interrupt checks to skip before really trying to interrupt.
// Controlled by the GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP env var.
static uint32_t sInterruptChecksToSkip = 200;
// Number of milliseconds that a reflow should be allowed to run for before we
// actually allow interruption. Controlled by the
// GECKO_REFLOW_MIN_NOINTERRUPT_DURATION env var. Can't be initialized here,
// because TimeDuration/TimeStamp is not safe to use in static constructors..
static TimeDuration sInterruptTimeout;
static void GetInterruptEnv()
{
char *ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_MODE");
if (ev) {
#ifndef XP_WIN
if (PL_strcasecmp(ev, "random") == 0) {
ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_SEED");
if (ev) {
sInterruptSeed = atoi(ev);
}
srandom(sInterruptSeed);
sInterruptMode = ModeRandom;
} else
#endif
if (PL_strcasecmp(ev, "counter") == 0) {
ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_FREQUENCY");
if (ev) {
sInterruptMaxCounter = atoi(ev);
}
sInterruptCounter = 0;
sInterruptMode = ModeCounter;
}
}
ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP");
if (ev) {
sInterruptChecksToSkip = atoi(ev);
}
ev = PR_GetEnv("GECKO_REFLOW_MIN_NOINTERRUPT_DURATION");
int duration_ms = ev ? atoi(ev) : 100;
sInterruptTimeout = TimeDuration::FromMilliseconds(duration_ms);
}
bool
nsPresContext::HavePendingInputEvent()
{
switch (sInterruptMode) {
#ifndef XP_WIN
case ModeRandom:
return (random() & 1);
#endif
case ModeCounter:
if (sInterruptCounter < sInterruptMaxCounter) {
++sInterruptCounter;
return false;
}
sInterruptCounter = 0;
return true;
default:
case ModeEvent: {
nsIFrame* f = PresShell()->GetRootFrame();
if (f) {
nsIWidget* w = f->GetNearestWidget();
if (w) {
return w->HasPendingInputEvent();
}
}
return false;
}
}
}
void
nsPresContext::NotifyFontFaceSetOnRefresh()
{
FontFaceSet* set = mDocument->GetFonts();
if (set) {
set->DidRefresh();
}
}
bool
nsPresContext::HasPendingRestyleOrReflow()
{
nsIPresShell* shell = PresShell();
return shell->NeedStyleFlush() || shell->HasPendingReflow();
}
void
nsPresContext::ReflowStarted(bool aInterruptible)
{
#ifdef NOISY_INTERRUPTIBLE_REFLOW
if (!aInterruptible) {
printf("STARTING NONINTERRUPTIBLE REFLOW\n");
}
#endif
// We don't support interrupting in paginated contexts, since page
// sequences only handle initial reflow
mInterruptsEnabled = aInterruptible && !IsPaginated() &&
nsLayoutUtils::InterruptibleReflowEnabled();
// Don't set mHasPendingInterrupt based on HavePendingInputEvent() here. If
// we ever change that, then we need to update the code in
// PresShell::DoReflow to only add the just-reflown root to dirty roots if
// it's actually dirty. Otherwise we can end up adding a root that has no
// interruptible descendants, just because we detected an interrupt at reflow
// start.
mHasPendingInterrupt = false;
mInterruptChecksToSkip = sInterruptChecksToSkip;
if (mInterruptsEnabled) {
mReflowStartTime = TimeStamp::Now();
}
}
bool
nsPresContext::CheckForInterrupt(nsIFrame* aFrame)
{
if (mHasPendingInterrupt) {
mShell->FrameNeedsToContinueReflow(aFrame);
return true;
}
if (!sGotInterruptEnv) {
sGotInterruptEnv = true;
GetInterruptEnv();
}
if (!mInterruptsEnabled) {
return false;
}
if (mInterruptChecksToSkip > 0) {
--mInterruptChecksToSkip;
return false;
}
mInterruptChecksToSkip = sInterruptChecksToSkip;
// Don't interrupt if it's been less than sInterruptTimeout since we started
// the reflow.
mHasPendingInterrupt =
TimeStamp::Now() - mReflowStartTime > sInterruptTimeout &&
HavePendingInputEvent() &&
!IsChrome();
if (mPendingInterruptFromTest) {
mPendingInterruptFromTest = false;
mHasPendingInterrupt = true;
}
if (mHasPendingInterrupt) {
#ifdef NOISY_INTERRUPTIBLE_REFLOW
printf("*** DETECTED pending interrupt (time=%lld)\n", PR_Now());
#endif /* NOISY_INTERRUPTIBLE_REFLOW */
mShell->FrameNeedsToContinueReflow(aFrame);
}
return mHasPendingInterrupt;
}
nsIFrame*
nsPresContext::GetPrimaryFrameFor(nsIContent* aContent)
{
NS_PRECONDITION(aContent, "Don't do that");
if (GetPresShell() &&
GetPresShell()->GetDocument() == aContent->GetComposedDoc()) {
return aContent->GetPrimaryFrame();
}
return nullptr;
}
size_t
nsPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return mLangGroupFontPrefs.SizeOfExcludingThis(aMallocSizeOf);
// Measurement of other members may be added later if DMD finds it is
// worthwhile.
}
bool
nsPresContext::IsRootContentDocument() const
{
// We are a root content document if: we are not a resource doc, we are
// not chrome, and we either have no parent or our parent is chrome.
if (mDocument->IsResourceDoc()) {
return false;
}
if (IsChrome()) {
return false;
}
// We may not have a root frame, so use views.
nsView* view = PresShell()->GetViewManager()->GetRootView();
if (!view) {
return false;
}
view = view->GetParent(); // anonymous inner view
if (!view) {
return true;
}
view = view->GetParent(); // subdocumentframe's view
if (!view) {
return true;
}
nsIFrame* f = view->GetFrame();
return (f && f->PresContext()->IsChrome());
}
void
nsPresContext::NotifyNonBlankPaint()
{
MOZ_ASSERT(!mHadNonBlankPaint);
mHadNonBlankPaint = true;
if (IsRootContentDocument()) {
RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
if (timing) {
timing->NotifyNonBlankPaintForRootContentDocument();
}
mFirstNonBlankPaintTime = TimeStamp::Now();
}
}
bool nsPresContext::GetPaintFlashing() const
{
if (!mPaintFlashingInitialized) {
bool pref = Preferences::GetBool("nglayout.debug.paint_flashing");
if (!pref && IsChrome()) {
pref = Preferences::GetBool("nglayout.debug.paint_flashing_chrome");
}
mPaintFlashing = pref;
mPaintFlashingInitialized = true;
}
return mPaintFlashing;
}
int32_t
nsPresContext::AppUnitsPerDevPixel() const
{
return mDeviceContext->AppUnitsPerDevPixel();
}
nscoord
nsPresContext::GfxUnitsToAppUnits(gfxFloat aGfxUnits) const
{
return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits);
}
gfxFloat
nsPresContext::AppUnitsToGfxUnits(nscoord aAppUnits) const
{
return mDeviceContext->AppUnitsToGfxUnits(aAppUnits);
}
nscoord
nsPresContext::PhysicalMillimetersToAppUnits(float aMM) const
{
float inches = aMM / MM_PER_INCH_FLOAT;
return NSToCoordFloorClamped(
inches * float(DeviceContext()->AppUnitsPerPhysicalInch()));
}
bool
nsPresContext::IsDeviceSizePageSize()
{
bool isDeviceSizePageSize = false;
nsCOMPtr<nsIDocShell> docShell(mContainer);
if (docShell) {
isDeviceSizePageSize = docShell->GetDeviceSizeIsPageSize();
}
return isDeviceSizePageSize;
}
uint64_t
nsPresContext::GetRestyleGeneration() const
{
if (!mRestyleManager) {
return 0;
}
return mRestyleManager->GetRestyleGeneration();
}
uint64_t
nsPresContext::GetUndisplayedRestyleGeneration() const
{
if (!mRestyleManager) {
return 0;
}
return mRestyleManager->GetUndisplayedRestyleGeneration();
}
nsBidi&
nsPresContext::GetBidiEngine()
{
MOZ_ASSERT(NS_IsMainThread());
if (!mBidiEngine) {
mBidiEngine.reset(new nsBidi());
}
return *mBidiEngine;
}
void
nsPresContext::FlushFontFeatureValues()
{
if (!mShell) {
return; // we've been torn down
}
if (mFontFeatureValuesDirty) {
StyleSetHandle styleSet = mShell->StyleSet();
mFontFeatureValuesLookup = styleSet->BuildFontFeatureValueSet();
mFontFeatureValuesDirty = false;
}
}
void
nsPresContext::RebuildFontFeatureValues()
{
if (!mShell) {
return; // we've been torn down
}
mFontFeatureValuesDirty = true;
mShell->SetNeedStyleFlush();
if (!mPostedFlushFontFeatureValues) {
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::HandleRebuildFontFeatureValues",
this, &nsPresContext::HandleRebuildFontFeatureValues);
nsresult rv =
Document()->Dispatch(TaskCategory::Other, ev.forget());
if (NS_SUCCEEDED(rv)) {
mPostedFlushFontFeatureValues = true;
}
}
}
nsRootPresContext::nsRootPresContext(nsIDocument* aDocument,
nsPresContextType aType)
: nsPresContext(aDocument, aType)
{
}
nsRootPresContext::~nsRootPresContext()
{
NS_ASSERTION(mRegisteredPlugins.Count() == 0,
"All plugins should have been unregistered");
CancelAllDidPaintTimers();
CancelApplyPluginGeometryTimer();
}
/* virtual */ void
nsRootPresContext::Detach()
{
CancelAllDidPaintTimers();
// XXXmats maybe also CancelApplyPluginGeometryTimer(); ?
nsPresContext::Detach();
}
void
nsRootPresContext::RegisterPluginForGeometryUpdates(nsIContent* aPlugin)
{
mRegisteredPlugins.PutEntry(aPlugin);
}
void
nsRootPresContext::UnregisterPluginForGeometryUpdates(nsIContent* aPlugin)
{
mRegisteredPlugins.RemoveEntry(aPlugin);
}
void
nsRootPresContext::ComputePluginGeometryUpdates(nsIFrame* aFrame,
nsDisplayListBuilder* aBuilder,
nsDisplayList* aList)
{
if (mRegisteredPlugins.Count() == 0) {
return;
}
// Initially make the next state for each plugin descendant of aFrame be
// "hidden". Plugins that are visible will have their next state set to
// unhidden by nsDisplayPlugin::ComputeVisibility.
for (auto iter = mRegisteredPlugins.Iter(); !iter.Done(); iter.Next()) {
auto f = static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
if (!f) {
NS_WARNING("Null frame in ComputePluginGeometryUpdates");
continue;
}
if (!nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, f)) {
// f is not managed by this frame so we should ignore it.
continue;
}
f->SetEmptyWidgetConfiguration();
}
if (aBuilder) {
MOZ_ASSERT(aList);
nsIFrame* rootFrame = FrameManager()->GetRootFrame();
if (rootFrame && aBuilder->ContainsPluginItem()) {
aBuilder->SetForPluginGeometry(true);
// Merging and flattening has already been done and we should not do it
// again. nsDisplayScroll(Info)Layer doesn't support trying to flatten
// again.
aBuilder->SetAllowMergingAndFlattening(false);
nsRegion region = rootFrame->GetVisualOverflowRectRelativeToSelf();
// nsDisplayPlugin::ComputeVisibility will automatically set a non-hidden
// widget configuration for the plugin, if it's visible.
aList->ComputeVisibilityForRoot(aBuilder, &region);
aBuilder->SetForPluginGeometry(false);
}
}
#ifdef XP_MACOSX
// We control painting of Mac plugins, so just apply geometry updates now.
// This is not happening during a paint event.
ApplyPluginGeometryUpdates();
#else
if (XRE_IsParentProcess()) {
InitApplyPluginGeometryTimer();
}
#endif
}
static void
ApplyPluginGeometryUpdatesCallback(nsITimer *aTimer, void *aClosure)
{
static_cast<nsRootPresContext*>(aClosure)->ApplyPluginGeometryUpdates();
}
void
nsRootPresContext::InitApplyPluginGeometryTimer()
{
if (mApplyPluginGeometryTimer) {
return;
}
// We'll apply the plugin geometry updates during the next compositing paint in this
// presContext (either from nsPresShell::WillPaintWindow or from
// nsPresShell::DidPaintWindow, depending on the platform). But paints might
// get optimized away if the old plugin geometry covers the invalid region,
// so set a backup timer to do this too. We want to make sure this
// won't fire before our normal paint notifications, if those would
// update the geometry, so set it for double the refresh driver interval.
mApplyPluginGeometryTimer = CreateTimer(ApplyPluginGeometryUpdatesCallback,
"ApplyPluginGeometryUpdatesCallback",
nsRefreshDriver::DefaultInterval() * 2);
}
void
nsRootPresContext::CancelApplyPluginGeometryTimer()
{
if (mApplyPluginGeometryTimer) {
mApplyPluginGeometryTimer->Cancel();
mApplyPluginGeometryTimer = nullptr;
}
}
#ifndef XP_MACOSX
static bool
HasOverlap(const LayoutDeviceIntPoint& aOffset1,
const nsTArray<LayoutDeviceIntRect>& aClipRects1,
const LayoutDeviceIntPoint& aOffset2,
const nsTArray<LayoutDeviceIntRect>& aClipRects2)
{
LayoutDeviceIntPoint offsetDelta = aOffset1 - aOffset2;
for (uint32_t i = 0; i < aClipRects1.Length(); ++i) {
for (uint32_t j = 0; j < aClipRects2.Length(); ++j) {
if ((aClipRects1[i] + offsetDelta).Intersects(aClipRects2[j])) {
return true;
}
}
}
return false;
}
/**
* Given a list of plugin windows to move to new locations, sort the list
* so that for each window move, the window moves to a location that
* does not intersect other windows. This minimizes flicker and repainting.
* It's not always possible to do this perfectly, since in general
* we might have cycles. But we do our best.
* We need to take into account that windows are clipped to particular
* regions and the clip regions change as the windows are moved.
*/
static void
SortConfigurations(nsTArray<nsIWidget::Configuration>* aConfigurations)
{
if (aConfigurations->Length() > 10) {
// Give up, we don't want to get bogged down here
return;
}
nsTArray<nsIWidget::Configuration> pluginsToMove;
pluginsToMove.SwapElements(*aConfigurations);
// Our algorithm is quite naive. At each step we try to identify
// a window that can be moved to its new location that won't overlap
// any other windows at the new location. If there is no such
// window, we just move the last window in the list anyway.
while (!pluginsToMove.IsEmpty()) {
// Find a window whose destination does not overlap any other window
uint32_t i;
for (i = 0; i + 1 < pluginsToMove.Length(); ++i) {
nsIWidget::Configuration* config = &pluginsToMove[i];
bool foundOverlap = false;
for (uint32_t j = 0; j < pluginsToMove.Length(); ++j) {
if (i == j)
continue;
LayoutDeviceIntRect bounds = pluginsToMove[j].mChild->GetBounds();
AutoTArray<LayoutDeviceIntRect,1> clipRects;
pluginsToMove[j].mChild->GetWindowClipRegion(&clipRects);
if (HasOverlap(bounds.TopLeft(), clipRects,
config->mBounds.TopLeft(),
config->mClipRegion)) {
foundOverlap = true;
break;
}
}
if (!foundOverlap)
break;
}
// Note that we always move the last plugin in pluginsToMove, if we
// can't find any other plugin to move
aConfigurations->AppendElement(pluginsToMove[i]);
pluginsToMove.RemoveElementAt(i);
}
}
static void
PluginGetGeometryUpdate(nsTHashtable<nsRefPtrHashKey<nsIContent>>& aPlugins,
nsTArray<nsIWidget::Configuration>* aConfigurations)
{
for (auto iter = aPlugins.Iter(); !iter.Done(); iter.Next()) {
auto f = static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
if (!f) {
NS_WARNING("Null frame in PluginGeometryUpdate");
continue;
}
f->GetWidgetConfiguration(aConfigurations);
}
}
#endif // #ifndef XP_MACOSX
static void
PluginDidSetGeometry(nsTHashtable<nsRefPtrHashKey<nsIContent>>& aPlugins)
{
for (auto iter = aPlugins.Iter(); !iter.Done(); iter.Next()) {
auto f = static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
if (!f) {
NS_WARNING("Null frame in PluginDidSetGeometry");
continue;
}
f->DidSetWidgetGeometry();
}
}
void
nsRootPresContext::ApplyPluginGeometryUpdates()
{
#ifndef XP_MACOSX
CancelApplyPluginGeometryTimer();
nsTArray<nsIWidget::Configuration> configurations;
PluginGetGeometryUpdate(mRegisteredPlugins, &configurations);
// Walk mRegisteredPlugins and ask each plugin for its configuration
if (!configurations.IsEmpty()) {
nsIWidget* widget = configurations[0].mChild->GetParent();
NS_ASSERTION(widget, "Plugins must have a parent window");
SortConfigurations(&configurations);
widget->ConfigureChildren(configurations);
}
#endif // #ifndef XP_MACOSX
PluginDidSetGeometry(mRegisteredPlugins);
}
void
nsRootPresContext::CollectPluginGeometryUpdates(LayerManager* aLayerManager)
{
#ifndef XP_MACOSX
// Collect and pass plugin widget configurations down to the compositor
// for transmission to the chrome process.
NS_ASSERTION(aLayerManager, "layer manager is invalid!");
mozilla::layers::ClientLayerManager* clm = aLayerManager->AsClientLayerManager();
nsTArray<nsIWidget::Configuration> configurations;
// If there aren't any plugins to configure, clear the plugin data cache
// in the layer system.
if (!mRegisteredPlugins.Count() && clm) {
clm->StorePluginWidgetConfigurations(configurations);
return;
}
PluginGetGeometryUpdate(mRegisteredPlugins, &configurations);
if (configurations.IsEmpty()) {
PluginDidSetGeometry(mRegisteredPlugins);
return;
}
SortConfigurations(&configurations);
if (clm) {
clm->StorePluginWidgetConfigurations(configurations);
}
PluginDidSetGeometry(mRegisteredPlugins);
#endif // #ifndef XP_MACOSX
}
void
nsRootPresContext::EnsureEventualDidPaintEvent(uint64_t aTransactionId)
{
for (NotifyDidPaintTimer& t : mNotifyDidPaintTimers) {
if (t.mTransactionId == aTransactionId) {
return;
}
}
nsCOMPtr<nsITimer> timer;
RefPtr<nsRootPresContext> self = this;
nsresult rv = NS_NewTimerWithCallback(
getter_AddRefs(timer),
NewNamedTimerCallback([self, aTransactionId](){
nsAutoScriptBlocker blockScripts;
self->NotifyDidPaintForSubtree(aTransactionId);
}, "NotifyDidPaintForSubtree"), 100, nsITimer::TYPE_ONE_SHOT,
Document()->EventTargetFor(TaskCategory::Other));
if (NS_SUCCEEDED(rv)) {
NotifyDidPaintTimer* t = mNotifyDidPaintTimers.AppendElement();
t->mTransactionId = aTransactionId;
t->mTimer = timer;
}
}
void
nsRootPresContext::CancelDidPaintTimers(uint64_t aTransactionId)
{
uint32_t i = 0;
while (i < mNotifyDidPaintTimers.Length()) {
if (mNotifyDidPaintTimers[i].mTransactionId <= aTransactionId) {
mNotifyDidPaintTimers[i].mTimer->Cancel();
mNotifyDidPaintTimers.RemoveElementAt(i);
} else {
i++;
}
}
}
void
nsRootPresContext::CancelAllDidPaintTimers()
{
for (uint32_t i = 0; i < mNotifyDidPaintTimers.Length(); i++) {
mNotifyDidPaintTimers[i].mTimer->Cancel();
}
mNotifyDidPaintTimers.Clear();
}
void
nsRootPresContext::AddWillPaintObserver(nsIRunnable* aRunnable)
{
if (!mWillPaintFallbackEvent.IsPending()) {
mWillPaintFallbackEvent = new RunWillPaintObservers(this);
Document()->Dispatch(TaskCategory::Other,
do_AddRef(mWillPaintFallbackEvent));
}
mWillPaintObservers.AppendElement(aRunnable);
}
/**
* Run all runnables that need to get called before the next paint.
*/
void
nsRootPresContext::FlushWillPaintObservers()
{
mWillPaintFallbackEvent = nullptr;
nsTArray<nsCOMPtr<nsIRunnable> > observers;
observers.SwapElements(mWillPaintObservers);
for (uint32_t i = 0; i < observers.Length(); ++i) {
observers[i]->Run();
}
}
size_t
nsRootPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
return nsPresContext::SizeOfExcludingThis(aMallocSizeOf);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mNotifyDidPaintTimer
// - mRegisteredPlugins
// - mWillPaintObservers
// - mWillPaintFallbackEvent
}
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