gecko-dev/layout/base/nsDisplayList.cpp

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200 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* 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/.
*/
/*
* structures that represent things to be painted (ordered in z-order),
* used during painting and hit testing
*/
#include "nsDisplayList.h"
#include <stdint.h>
#include <algorithm>
#include "mozilla/dom/TabChild.h"
#include "mozilla/layers/PLayerTransaction.h"
#include "nsCSSRendering.h"
#include "nsRenderingContext.h"
#include "nsISelectionController.h"
#include "nsIPresShell.h"
#include "nsRegion.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "gfxMatrix.h"
#include "gfxPrefs.h"
#include "nsSVGIntegrationUtils.h"
#include "nsSVGUtils.h"
#include "nsLayoutUtils.h"
#include "nsIScrollableFrame.h"
#include "nsIFrameInlines.h"
#include "nsThemeConstants.h"
#include "LayerTreeInvalidation.h"
#include "imgIContainer.h"
#include "BasicLayers.h"
#include "nsBoxFrame.h"
#include "nsViewportFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsSVGEffects.h"
#include "nsSVGElement.h"
#include "nsSVGClipPathFrame.h"
#include "GeckoProfiler.h"
#include "nsAnimationManager.h"
#include "nsTransitionManager.h"
#include "nsViewManager.h"
#include "ImageLayers.h"
#include "ImageContainer.h"
#include "nsCanvasFrame.h"
#include "StickyScrollContainer.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Preferences.h"
#include "mozilla/UniquePtr.h"
#include "ActiveLayerTracker.h"
#include "nsContentUtils.h"
#include "nsPrintfCString.h"
#include "UnitTransforms.h"
#include "LayersLogging.h"
#include "FrameLayerBuilder.h"
#include "nsCaret.h"
#include "nsISelection.h"
using namespace mozilla;
using namespace mozilla::layers;
using namespace mozilla::dom;
using namespace mozilla::layout;
using namespace mozilla::gfx;
typedef FrameMetrics::ViewID ViewID;
#ifdef DEBUG
static bool
SpammyLayoutWarningsEnabled()
{
static bool sValue = false;
static bool sValueInitialized = false;
if (!sValueInitialized) {
Preferences::GetBool("layout.spammy_warnings.enabled", &sValue);
sValueInitialized = true;
}
return sValue;
}
#endif
static inline nsIFrame*
GetTransformRootFrame(nsIFrame* aFrame)
{
return nsLayoutUtils::GetTransformRootFrame(aFrame);
}
static void AddTransformFunctions(nsCSSValueList* aList,
nsStyleContext* aContext,
nsPresContext* aPresContext,
nsRect& aBounds,
InfallibleTArray<TransformFunction>& aFunctions)
{
if (aList->mValue.GetUnit() == eCSSUnit_None) {
return;
}
for (const nsCSSValueList* curr = aList; curr; curr = curr->mNext) {
const nsCSSValue& currElem = curr->mValue;
NS_ASSERTION(currElem.GetUnit() == eCSSUnit_Function,
"Stream should consist solely of functions!");
nsCSSValue::Array* array = currElem.GetArrayValue();
bool canStoreInRuleTree = true;
switch (nsStyleTransformMatrix::TransformFunctionOf(array)) {
case eCSSKeyword_rotatex:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationX(theta));
break;
}
case eCSSKeyword_rotatey:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationY(theta));
break;
}
case eCSSKeyword_rotatez:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationZ(theta));
break;
}
case eCSSKeyword_rotate:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(Rotation(theta));
break;
}
case eCSSKeyword_rotate3d:
{
double x = array->Item(1).GetFloatValue();
double y = array->Item(2).GetFloatValue();
double z = array->Item(3).GetFloatValue();
double theta = array->Item(4).GetAngleValueInRadians();
aFunctions.AppendElement(Rotation3D(x, y, z, theta));
break;
}
case eCSSKeyword_scalex:
{
double x = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(x, 1, 1));
break;
}
case eCSSKeyword_scaley:
{
double y = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(1, y, 1));
break;
}
case eCSSKeyword_scalez:
{
double z = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(1, 1, z));
break;
}
case eCSSKeyword_scale:
{
double x = array->Item(1).GetFloatValue();
// scale(x) is shorthand for scale(x, x);
double y = array->Count() == 2 ? x : array->Item(2).GetFloatValue();
aFunctions.AppendElement(Scale(x, y, 1));
break;
}
case eCSSKeyword_scale3d:
{
double x = array->Item(1).GetFloatValue();
double y = array->Item(2).GetFloatValue();
double z = array->Item(3).GetFloatValue();
aFunctions.AppendElement(Scale(x, y, z));
break;
}
case eCSSKeyword_translatex:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
aBounds.Width());
aFunctions.AppendElement(Translation(x, 0, 0));
break;
}
case eCSSKeyword_translatey:
{
double y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
aBounds.Height());
aFunctions.AppendElement(Translation(0, y, 0));
break;
}
case eCSSKeyword_translatez:
{
double z = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
0);
aFunctions.AppendElement(Translation(0, 0, z));
break;
}
case eCSSKeyword_translate:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
aBounds.Width());
// translate(x) is shorthand for translate(x, 0)
double y = 0;
if (array->Count() == 3) {
y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(2), aContext, aPresContext, canStoreInRuleTree,
aBounds.Height());
}
aFunctions.AppendElement(Translation(x, y, 0));
break;
}
case eCSSKeyword_translate3d:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
aBounds.Width());
double y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(2), aContext, aPresContext, canStoreInRuleTree,
aBounds.Height());
double z = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(3), aContext, aPresContext, canStoreInRuleTree,
0);
aFunctions.AppendElement(Translation(x, y, z));
break;
}
case eCSSKeyword_skewx:
{
double x = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(SkewX(x));
break;
}
case eCSSKeyword_skewy:
{
double y = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(SkewY(y));
break;
}
case eCSSKeyword_skew:
{
double x = array->Item(1).GetAngleValueInRadians();
// skew(x) is shorthand for skew(x, 0)
double y = 0;
if (array->Count() == 3) {
y = array->Item(2).GetAngleValueInRadians();
}
aFunctions.AppendElement(Skew(x, y));
break;
}
case eCSSKeyword_matrix:
{
gfx::Matrix4x4 matrix;
matrix._11 = array->Item(1).GetFloatValue();
matrix._12 = array->Item(2).GetFloatValue();
matrix._13 = 0;
matrix._14 = 0;
matrix._21 = array->Item(3).GetFloatValue();
matrix._22 = array->Item(4).GetFloatValue();
matrix._23 = 0;
matrix._24 = 0;
matrix._31 = 0;
matrix._32 = 0;
matrix._33 = 1;
matrix._34 = 0;
matrix._41 = array->Item(5).GetFloatValue();
matrix._42 = array->Item(6).GetFloatValue();
matrix._43 = 0;
matrix._44 = 1;
aFunctions.AppendElement(TransformMatrix(matrix));
break;
}
case eCSSKeyword_matrix3d:
{
gfx::Matrix4x4 matrix;
matrix._11 = array->Item(1).GetFloatValue();
matrix._12 = array->Item(2).GetFloatValue();
matrix._13 = array->Item(3).GetFloatValue();
matrix._14 = array->Item(4).GetFloatValue();
matrix._21 = array->Item(5).GetFloatValue();
matrix._22 = array->Item(6).GetFloatValue();
matrix._23 = array->Item(7).GetFloatValue();
matrix._24 = array->Item(8).GetFloatValue();
matrix._31 = array->Item(9).GetFloatValue();
matrix._32 = array->Item(10).GetFloatValue();
matrix._33 = array->Item(11).GetFloatValue();
matrix._34 = array->Item(12).GetFloatValue();
matrix._41 = array->Item(13).GetFloatValue();
matrix._42 = array->Item(14).GetFloatValue();
matrix._43 = array->Item(15).GetFloatValue();
matrix._44 = array->Item(16).GetFloatValue();
aFunctions.AppendElement(TransformMatrix(matrix));
break;
}
case eCSSKeyword_interpolatematrix:
{
gfx3DMatrix matrix;
nsStyleTransformMatrix::ProcessInterpolateMatrix(matrix, array,
aContext,
aPresContext,
canStoreInRuleTree,
aBounds);
aFunctions.AppendElement(TransformMatrix(gfx::ToMatrix4x4(matrix)));
break;
}
case eCSSKeyword_perspective:
{
aFunctions.AppendElement(Perspective(array->Item(1).GetFloatValue()));
break;
}
default:
NS_ERROR("Function not handled yet!");
}
}
}
static TimingFunction
ToTimingFunction(ComputedTimingFunction& aCTF)
{
if (aCTF.GetType() == nsTimingFunction::Function) {
const nsSMILKeySpline* spline = aCTF.GetFunction();
return TimingFunction(CubicBezierFunction(spline->X1(), spline->Y1(),
spline->X2(), spline->Y2()));
}
uint32_t type = aCTF.GetType() == nsTimingFunction::StepStart ? 1 : 2;
return TimingFunction(StepFunction(aCTF.GetSteps(), type));
}
static void
AddAnimationForProperty(nsIFrame* aFrame, nsCSSProperty aProperty,
AnimationPlayer* aPlayer, Layer* aLayer,
AnimationData& aData, bool aPending)
{
MOZ_ASSERT(aLayer->AsContainerLayer(), "Should only animate ContainerLayer");
MOZ_ASSERT(aPlayer->GetSource(),
"Should not be adding an animation for a player without"
" an animation");
nsStyleContext* styleContext = aFrame->StyleContext();
nsPresContext* presContext = aFrame->PresContext();
nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(aFrame);
layers::Animation* animation =
aPending ?
aLayer->AddAnimationForNextTransaction() :
aLayer->AddAnimation();
const AnimationTiming& timing = aPlayer->GetSource()->Timing();
animation->startTime() = aPlayer->Timeline()->ToTimeStamp(aPlayer->mStartTime.Value() + timing.mDelay);
animation->duration() = timing.mIterationDuration;
animation->iterationCount() = timing.mIterationCount;
animation->direction() = timing.mDirection;
animation->property() = aProperty;
animation->data() = aData;
dom::Animation* anim = aPlayer->GetSource();
for (size_t propIdx = 0;
propIdx < anim->Properties().Length();
propIdx++) {
AnimationProperty& property = anim->Properties()[propIdx];
if (aProperty != property.mProperty) {
continue;
}
for (uint32_t segIdx = 0; segIdx < property.mSegments.Length(); segIdx++) {
AnimationPropertySegment& segment = property.mSegments[segIdx];
AnimationSegment* animSegment = animation->segments().AppendElement();
if (aProperty == eCSSProperty_transform) {
animSegment->startState() = InfallibleTArray<TransformFunction>();
animSegment->endState() = InfallibleTArray<TransformFunction>();
nsCSSValueSharedList* list =
segment.mFromValue.GetCSSValueSharedListValue();
AddTransformFunctions(list->mHead, styleContext, presContext, bounds,
animSegment->startState().get_ArrayOfTransformFunction());
list = segment.mToValue.GetCSSValueSharedListValue();
AddTransformFunctions(list->mHead, styleContext, presContext, bounds,
animSegment->endState().get_ArrayOfTransformFunction());
} else if (aProperty == eCSSProperty_opacity) {
animSegment->startState() = segment.mFromValue.GetFloatValue();
animSegment->endState() = segment.mToValue.GetFloatValue();
}
animSegment->startPortion() = segment.mFromKey;
animSegment->endPortion() = segment.mToKey;
animSegment->sampleFn() = ToTimingFunction(segment.mTimingFunction);
}
}
}
static void
AddAnimationsForProperty(nsIFrame* aFrame, nsCSSProperty aProperty,
AnimationPlayerPtrArray& aPlayers,
Layer* aLayer, AnimationData& aData,
bool aPending) {
for (size_t playerIdx = 0; playerIdx < aPlayers.Length(); playerIdx++) {
AnimationPlayer* player = aPlayers[playerIdx];
dom::Animation* anim = player->GetSource();
if (!(anim && anim->HasAnimationOfProperty(aProperty) &&
player->IsRunning())) {
continue;
}
AddAnimationForProperty(aFrame, aProperty, player, aLayer, aData, aPending);
player->mIsRunningOnCompositor = true;
}
}
/* static */ void
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(Layer* aLayer,
nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
nsIFrame* aFrame,
nsCSSProperty aProperty)
{
// This function can be called in two ways: from
// nsDisplay*::BuildLayer while constructing a layer (with all
// pointers non-null), or from RestyleManager's handling of
// UpdateOpacityLayer/UpdateTransformLayer hints.
MOZ_ASSERT(!aBuilder == !aItem,
"should only be called in two configurations, with both "
"aBuilder and aItem, or with neither");
MOZ_ASSERT(!aItem || aFrame == aItem->Frame(), "frame mismatch");
bool pending = !aBuilder;
if (pending) {
aLayer->ClearAnimationsForNextTransaction();
} else {
aLayer->ClearAnimations();
}
nsIContent* content = aFrame->GetContent();
if (!content) {
return;
}
AnimationPlayerCollection* transitions =
nsTransitionManager::GetAnimationsForCompositor(content, aProperty);
AnimationPlayerCollection* animations =
nsAnimationManager::GetAnimationsForCompositor(content, aProperty);
if (!animations && !transitions) {
return;
}
// If the frame is not prerendered, bail out.
// Do this check only during layer construction; during updating the
// caller is required to check it appropriately.
if (aItem && !aItem->CanUseAsyncAnimations(aBuilder)) {
// AnimationManager or TransitionManager need to know that we refused to
// run this animation asynchronously so that they will not throttle the
// main thread animation.
aFrame->Properties().Set(nsIFrame::RefusedAsyncAnimation(),
reinterpret_cast<void*>(intptr_t(true)));
// We need to schedule another refresh driver run so that AnimationManager
// or TransitionManager get a chance to unthrottle the animation.
aFrame->SchedulePaint();
return;
}
AnimationData data;
if (aProperty == eCSSProperty_transform) {
nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(aFrame);
// all data passed directly to the compositor should be in css pixels
float scale = nsDeviceContext::AppUnitsPerCSSPixel();
Point3D offsetToTransformOrigin =
nsDisplayTransform::GetDeltaToTransformOrigin(aFrame, scale, &bounds);
Point3D offsetToPerspectiveOrigin =
nsDisplayTransform::GetDeltaToPerspectiveOrigin(aFrame, scale);
nscoord perspective = 0.0;
nsStyleContext* parentStyleContext = aFrame->StyleContext()->GetParent();
if (parentStyleContext) {
const nsStyleDisplay* disp = parentStyleContext->StyleDisplay();
if (disp && disp->mChildPerspective.GetUnit() == eStyleUnit_Coord) {
perspective = disp->mChildPerspective.GetCoordValue();
}
}
nsPoint origin;
if (aItem) {
origin = aItem->ToReferenceFrame();
} else {
// transform display items used a reference frame computed from
// their GetTransformRootFrame().
nsIFrame* referenceFrame =
nsLayoutUtils::GetReferenceFrame(GetTransformRootFrame(aFrame));
origin = aFrame->GetOffsetToCrossDoc(referenceFrame);
}
data = TransformData(origin, offsetToTransformOrigin,
offsetToPerspectiveOrigin, bounds, perspective,
aFrame->PresContext()->AppUnitsPerDevPixel());
} else if (aProperty == eCSSProperty_opacity) {
data = null_t();
}
if (transitions) {
AddAnimationsForProperty(aFrame, aProperty, transitions->mPlayers,
aLayer, data, pending);
aLayer->SetAnimationGeneration(transitions->mAnimationGeneration);
}
if (animations) {
AddAnimationsForProperty(aFrame, aProperty, animations->mPlayers,
aLayer, data, pending);
aLayer->SetAnimationGeneration(animations->mAnimationGeneration);
}
}
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
Mode aMode, bool aBuildCaret)
: mReferenceFrame(aReferenceFrame),
mIgnoreScrollFrame(nullptr),
mLayerEventRegions(nullptr),
mCurrentTableItem(nullptr),
mCurrentFrame(aReferenceFrame),
mCurrentReferenceFrame(aReferenceFrame),
mDirtyRect(-1,-1,-1,-1),
mGlassDisplayItem(nullptr),
mMode(aMode),
mCurrentScrollParentId(FrameMetrics::NULL_SCROLL_ID),
mCurrentScrollbarTarget(FrameMetrics::NULL_SCROLL_ID),
mCurrentScrollbarFlags(0),
mBuildCaret(aBuildCaret),
mIgnoreSuppression(false),
mHadToIgnoreSuppression(false),
mIsAtRootOfPseudoStackingContext(false),
mIncludeAllOutOfFlows(false),
mDescendIntoSubdocuments(true),
mSelectedFramesOnly(false),
mAccurateVisibleRegions(false),
mAllowMergingAndFlattening(true),
mWillComputePluginGeometry(false),
mInTransform(false),
mSyncDecodeImages(false),
mIsPaintingToWindow(false),
mIsCompositingCheap(false),
mContainsPluginItem(false),
mAncestorHasTouchEventHandler(false),
mHaveScrollableDisplayPort(false)
{
MOZ_COUNT_CTOR(nsDisplayListBuilder);
PL_InitArenaPool(&mPool, "displayListArena", 1024,
std::max(NS_ALIGNMENT_OF(void*),NS_ALIGNMENT_OF(double))-1);
nsPresContext* pc = aReferenceFrame->PresContext();
nsIPresShell *shell = pc->PresShell();
if (pc->IsRenderingOnlySelection()) {
nsCOMPtr<nsISelectionController> selcon(do_QueryInterface(shell));
if (selcon) {
selcon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mBoundingSelection));
}
}
nsCSSRendering::BeginFrameTreesLocked();
PR_STATIC_ASSERT(nsDisplayItem::TYPE_MAX < (1 << nsDisplayItem::TYPE_BITS));
}
static void MarkFrameForDisplay(nsIFrame* aFrame, nsIFrame* aStopAtFrame) {
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetParentOrPlaceholderFor(f)) {
if (f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)
return;
f->AddStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
if (f == aStopAtFrame) {
// we've reached a frame that we know will be painted, so we can stop.
break;
}
}
}
void nsDisplayListBuilder::SetContainsBlendMode(uint8_t aBlendMode)
{
MOZ_ASSERT(aBlendMode != NS_STYLE_BLEND_NORMAL);
gfxContext::GraphicsOperator op = nsCSSRendering::GetGFXBlendMode(aBlendMode);
mContainedBlendModes += gfx::CompositionOpForOp(op);
}
bool nsDisplayListBuilder::NeedToForceTransparentSurfaceForItem(nsDisplayItem* aItem)
{
return aItem == mGlassDisplayItem || aItem->ClearsBackground();
}
void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame,
nsIFrame* aFrame,
const nsRect& aDirtyRect)
{
nsRect dirtyRectRelativeToDirtyFrame = aDirtyRect;
if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(aFrame) &&
IsPaintingToWindow()) {
NS_ASSERTION(aDirtyFrame == aFrame->GetParent(), "Dirty frame should be viewport frame");
// position: fixed items are reflowed into and only drawn inside the
// viewport, or the scroll position clamping scrollport size, if one is
// set.
nsIPresShell* ps = aFrame->PresContext()->PresShell();
dirtyRectRelativeToDirtyFrame.MoveTo(0, 0);
if (ps->IsScrollPositionClampingScrollPortSizeSet()) {
dirtyRectRelativeToDirtyFrame.SizeTo(ps->GetScrollPositionClampingScrollPortSize());
} else {
dirtyRectRelativeToDirtyFrame.SizeTo(aDirtyFrame->GetSize());
}
}
nsRect dirty = dirtyRectRelativeToDirtyFrame - aFrame->GetOffsetTo(aDirtyFrame);
nsRect overflowRect = aFrame->GetVisualOverflowRect();
if (aFrame->IsTransformed() &&
nsLayoutUtils::HasAnimationsForCompositor(aFrame->GetContent(),
eCSSProperty_transform)) {
/**
* Add a fuzz factor to the overflow rectangle so that elements only just
* out of view are pulled into the display list, so they can be
* prerendered if necessary.
*/
overflowRect.Inflate(nsPresContext::CSSPixelsToAppUnits(32));
}
if (!dirty.IntersectRect(dirty, overflowRect))
return;
const DisplayItemClip* clip = mClipState.GetClipForContainingBlockDescendants();
OutOfFlowDisplayData* data = clip ? new OutOfFlowDisplayData(*clip, dirty)
: new OutOfFlowDisplayData(dirty);
aFrame->Properties().Set(nsDisplayListBuilder::OutOfFlowDisplayDataProperty(), data);
MarkFrameForDisplay(aFrame, aDirtyFrame);
}
static void UnmarkFrameForDisplay(nsIFrame* aFrame) {
nsPresContext* presContext = aFrame->PresContext();
presContext->PropertyTable()->
Delete(aFrame, nsDisplayListBuilder::OutOfFlowDisplayDataProperty());
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetParentOrPlaceholderFor(f)) {
if (!(f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO))
return;
f->RemoveStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
}
}
/* static */ FrameMetrics
nsDisplayScrollLayer::ComputeFrameMetrics(nsIFrame* aForFrame,
nsIFrame* aScrollFrame,
const nsIFrame* aReferenceFrame,
Layer* aLayer,
ViewID aScrollParentId,
const nsRect& aViewport,
bool aForceNullScrollId,
bool aIsRoot,
const ContainerLayerParameters& aContainerParameters)
{
nsPresContext* presContext = aForFrame->PresContext();
int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
LayoutDeviceToLayerScale resolution(aContainerParameters.mXScale, aContainerParameters.mYScale);
nsIPresShell* presShell = presContext->GetPresShell();
FrameMetrics metrics;
metrics.SetViewport(CSSRect::FromAppUnits(aViewport));
ViewID scrollId = FrameMetrics::NULL_SCROLL_ID;
nsIContent* content = aScrollFrame ? aScrollFrame->GetContent() : nullptr;
if (content) {
if (!aForceNullScrollId) {
scrollId = nsLayoutUtils::FindOrCreateIDFor(content);
}
nsRect dp;
if (nsLayoutUtils::GetDisplayPort(content, &dp)) {
metrics.mDisplayPort = CSSRect::FromAppUnits(dp);
nsLayoutUtils::LogTestDataForPaint(aLayer->Manager(), scrollId, "displayport",
metrics.mDisplayPort);
}
if (nsLayoutUtils::GetCriticalDisplayPort(content, &dp)) {
metrics.mCriticalDisplayPort = CSSRect::FromAppUnits(dp);
}
DisplayPortMarginsPropertyData* marginsData =
static_cast<DisplayPortMarginsPropertyData*>(content->GetProperty(nsGkAtoms::DisplayPortMargins));
if (marginsData) {
metrics.SetDisplayPortMargins(marginsData->mMargins);
}
}
nsIScrollableFrame* scrollableFrame = nullptr;
if (aScrollFrame)
scrollableFrame = aScrollFrame->GetScrollTargetFrame();
metrics.mScrollableRect = CSSRect::FromAppUnits(
nsLayoutUtils::CalculateScrollableRectForFrame(scrollableFrame, aForFrame));
if (scrollableFrame) {
nsPoint scrollPosition = scrollableFrame->GetScrollPosition();
metrics.SetScrollOffset(CSSPoint::FromAppUnits(scrollPosition));
nsPoint smoothScrollPosition = scrollableFrame->LastScrollDestination();
metrics.SetSmoothScrollOffset(CSSPoint::FromAppUnits(smoothScrollPosition));
// If the frame was scrolled since the last layers update, and by
// something other than the APZ code, we want to tell the APZ to update
// its scroll offset.
nsIAtom* lastScrollOrigin = scrollableFrame->LastScrollOrigin();
if (lastScrollOrigin && lastScrollOrigin != nsGkAtoms::apz) {
metrics.SetScrollOffsetUpdated(scrollableFrame->CurrentScrollGeneration());
}
nsIAtom* lastSmoothScrollOrigin = scrollableFrame->LastSmoothScrollOrigin();
if (lastSmoothScrollOrigin) {
metrics.SetSmoothScrollOffsetUpdated(scrollableFrame->CurrentScrollGeneration());
}
}
metrics.SetScrollId(scrollId);
metrics.SetIsRoot(aIsRoot);
metrics.SetScrollParentId(aScrollParentId);
// Only the root scrollable frame for a given presShell should pick up
// the presShell's resolution. All the other frames are 1.0.
if (aScrollFrame == presShell->GetRootScrollFrame()) {
metrics.mResolution = ParentLayerToLayerScale(presShell->GetXResolution(),
presShell->GetYResolution());
} else {
metrics.mResolution = ParentLayerToLayerScale(1.0f);
}
// For the cumulateive resolution, multiply the resolutions of all the
// presShells back up to the root
metrics.mCumulativeResolution = LayoutDeviceToLayerScale(1.0f);
nsIPresShell* curPresShell = presShell;
while (curPresShell != nullptr) {
ParentLayerToLayerScale presShellResolution(curPresShell->GetXResolution(),
curPresShell->GetYResolution());
metrics.mCumulativeResolution.scale *= presShellResolution.scale;
nsPresContext* parentContext = curPresShell->GetPresContext()->GetParentPresContext();
curPresShell = parentContext ? parentContext->GetPresShell() : nullptr;
}
metrics.mDevPixelsPerCSSPixel = CSSToLayoutDeviceScale(
(float)nsPresContext::AppUnitsPerCSSPixel() / auPerDevPixel);
// Initially, AsyncPanZoomController should render the content to the screen
// at the painted resolution.
const LayerToScreenScale layerToScreenScale(1.0f);
metrics.SetZoom(metrics.mCumulativeResolution * metrics.mDevPixelsPerCSSPixel
* layerToScreenScale);
if (presShell) {
nsIDocument* document = nullptr;
document = presShell->GetDocument();
if (document) {
nsCOMPtr<nsPIDOMWindow> innerWin(document->GetInnerWindow());
if (innerWin) {
metrics.mMayHaveTouchListeners = innerWin->HasTouchEventListeners();
}
}
metrics.mMayHaveTouchCaret = presShell->MayHaveTouchCaret();
}
LayoutDeviceToParentLayerScale layoutToParentLayerScale =
// The ScreenToParentLayerScale should be mTransformScale which is not calculated yet,
// but we don't yet handle CSS transforms, so we assume it's 1 here.
metrics.mCumulativeResolution * LayerToScreenScale(1.0) * ScreenToParentLayerScale(1.0);
// Calculate the composition bounds as the size of the scroll frame and
// its origin relative to the reference frame.
// If aScrollFrame is null, we are in a document without a root scroll frame,
// so it's a xul document. In this case, use the size of the viewport frame.
nsIFrame* frameForCompositionBoundsCalculation = aScrollFrame ? aScrollFrame : aForFrame;
nsRect compositionBounds(frameForCompositionBoundsCalculation->GetOffsetToCrossDoc(aReferenceFrame),
frameForCompositionBoundsCalculation->GetSize());
ParentLayerRect frameBounds = LayoutDeviceRect::FromAppUnits(compositionBounds, auPerDevPixel)
* layoutToParentLayerScale;
metrics.mCompositionBounds = frameBounds;
// For the root scroll frame of the root content document, the above calculation
// will yield the size of the viewport frame as the composition bounds, which
// doesn't actually correspond to what is visible when
// nsIDOMWindowUtils::setCSSViewport has been called to modify the visible area of
// the prescontext that the viewport frame is reflowed into. In that case if our
// document has a widget then the widget's bounds will correspond to what is
// visible. If we don't have a widget the root view's bounds correspond to what
// would be visible because they don't get modified by setCSSViewport.
bool isRootScrollFrame = aScrollFrame == presShell->GetRootScrollFrame();
bool isRootContentDocRootScrollFrame = isRootScrollFrame
&& presContext->IsRootContentDocument();
if (isRootContentDocRootScrollFrame) {
if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
// On Android, we need to do things a bit differently to get things
// right (see bug 983208, bug 988882). We use the bounds of the nearest
// widget, but clamp the height to the frame bounds height. This clamping
// is done to get correct results for a page where the page is sized to
// the screen and thus the dynamic toolbar never disappears. In such a
// case, we want the composition bounds to exclude the toolbar height,
// but the widget bounds includes it. We don't currently have a good way
// of knowing about the toolbar height, but clamping to the frame bounds
// height gives the correct answer in the cases we care about.
#ifdef MOZ_WIDGET_ANDROID
nsIWidget* widget = rootFrame->GetNearestWidget();
#else
nsView* view = rootFrame->GetView();
nsIWidget* widget = view ? view->GetWidget() : nullptr;
#endif
if (widget) {
nsIntRect widgetBounds;
widget->GetBounds(widgetBounds);
metrics.mCompositionBounds = ParentLayerRect(ViewAs<ParentLayerPixel>(widgetBounds));
#ifdef MOZ_WIDGET_ANDROID
if (frameBounds.height < metrics.mCompositionBounds.height) {
metrics.mCompositionBounds.height = frameBounds.height;
}
#endif
} else {
LayoutDeviceIntSize contentSize;
if (nsLayoutUtils::GetContentViewerSize(presContext, contentSize)) {
LayoutDeviceToParentLayerScale scale(1.0f);
if (presContext->GetParentPresContext()) {
gfxSize res = presContext->GetParentPresContext()->PresShell()->GetCumulativeResolution();
scale = LayoutDeviceToParentLayerScale(res.width, res.height);
}
metrics.mCompositionBounds.SizeTo(contentSize * scale);
}
}
}
}
// Adjust composition bounds for the size of scroll bars.
if (scrollableFrame && !LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) {
nsMargin sizes = scrollableFrame->GetActualScrollbarSizes();
// Scrollbars are not subject to scaling, so CSS pixels = layer pixels for them.
ParentLayerMargin boundMargins = CSSMargin::FromAppUnits(sizes) * CSSToParentLayerScale(1.0f);
metrics.mCompositionBounds.Deflate(boundMargins);
}
metrics.SetRootCompositionSize(
nsLayoutUtils::CalculateRootCompositionSize(aScrollFrame ? aScrollFrame : aForFrame,
isRootContentDocRootScrollFrame, metrics));
if (gfxPrefs::APZPrintTree()) {
if (nsIContent* content = frameForCompositionBoundsCalculation->GetContent()) {
nsAutoString contentDescription;
content->Describe(contentDescription);
metrics.SetContentDescription(NS_LossyConvertUTF16toASCII(contentDescription));
}
}
metrics.SetPresShellId(presShell->GetPresShellId());
// If the scroll frame's content is marked 'scrollgrab', record this
// in the FrameMetrics so APZ knows to provide the scroll grabbing
// behaviour.
if (aScrollFrame && nsContentUtils::HasScrollgrab(aScrollFrame->GetContent())) {
metrics.SetHasScrollgrab(true);
}
// Also compute and set the background color.
// This is needed for APZ overscrolling support.
if (aScrollFrame) {
if (isRootScrollFrame) {
metrics.SetBackgroundColor(presShell->GetCanvasBackground());
} else {
nsStyleContext* backgroundStyle;
if (nsCSSRendering::FindBackground(aScrollFrame, &backgroundStyle)) {
metrics.SetBackgroundColor(backgroundStyle->StyleBackground()->mBackgroundColor);
}
}
}
return metrics;
}
nsDisplayListBuilder::~nsDisplayListBuilder() {
NS_ASSERTION(mFramesMarkedForDisplay.Length() == 0,
"All frames should have been unmarked");
NS_ASSERTION(mPresShellStates.Length() == 0,
"All presshells should have been exited");
NS_ASSERTION(!mCurrentTableItem, "No table item should be active");
nsCSSRendering::EndFrameTreesLocked();
for (uint32_t i = 0; i < mDisplayItemClipsToDestroy.Length(); ++i) {
mDisplayItemClipsToDestroy[i]->DisplayItemClip::~DisplayItemClip();
}
PL_FinishArenaPool(&mPool);
MOZ_COUNT_DTOR(nsDisplayListBuilder);
}
uint32_t
nsDisplayListBuilder::GetBackgroundPaintFlags() {
uint32_t flags = 0;
if (mSyncDecodeImages) {
flags |= nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES;
}
if (mIsPaintingToWindow) {
flags |= nsCSSRendering::PAINTBG_TO_WINDOW;
}
return flags;
}
void
nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
const nsRegion& aRegion)
{
if (aRegion.IsEmpty())
return;
nsRegion tmp;
tmp.Sub(*aVisibleRegion, aRegion);
// Don't let *aVisibleRegion get too complex, but don't let it fluff out
// to its bounds either, which can be very bad (see bug 516740).
// Do let aVisibleRegion get more complex if by doing so we reduce its
// area by at least half.
if (GetAccurateVisibleRegions() || tmp.GetNumRects() <= 15 ||
tmp.Area() <= aVisibleRegion->Area()/2) {
*aVisibleRegion = tmp;
}
}
nsCaret *
nsDisplayListBuilder::GetCaret() {
nsRefPtr<nsCaret> caret = CurrentPresShellState()->mPresShell->GetCaret();
return caret;
}
void
nsDisplayListBuilder::EnterPresShell(nsIFrame* aReferenceFrame)
{
PresShellState* state = mPresShellStates.AppendElement();
state->mPresShell = aReferenceFrame->PresContext()->PresShell();
state->mCaretFrame = nullptr;
state->mFirstFrameMarkedForDisplay = mFramesMarkedForDisplay.Length();
state->mPresShell->UpdateCanvasBackground();
if (mIsPaintingToWindow) {
mReferenceFrame->AddPaintedPresShell(state->mPresShell);
state->mPresShell->IncrementPaintCount();
}
bool buildCaret = mBuildCaret;
if (mIgnoreSuppression || !state->mPresShell->IsPaintingSuppressed()) {
if (state->mPresShell->IsPaintingSuppressed()) {
mHadToIgnoreSuppression = true;
}
state->mIsBackgroundOnly = false;
} else {
state->mIsBackgroundOnly = true;
buildCaret = false;
}
if (!buildCaret)
return;
nsRefPtr<nsCaret> caret = state->mPresShell->GetCaret();
state->mCaretFrame = caret->GetPaintGeometry(&state->mCaretRect);
if (state->mCaretFrame) {
mFramesMarkedForDisplay.AppendElement(state->mCaretFrame);
MarkFrameForDisplay(state->mCaretFrame, nullptr);
}
}
void
nsDisplayListBuilder::LeavePresShell(nsIFrame* aReferenceFrame)
{
NS_ASSERTION(CurrentPresShellState()->mPresShell ==
aReferenceFrame->PresContext()->PresShell(),
"Presshell mismatch");
ResetMarkedFramesForDisplayList();
mPresShellStates.SetLength(mPresShellStates.Length() - 1);
}
void
nsDisplayListBuilder::ResetMarkedFramesForDisplayList()
{
// Unmark and pop off the frames marked for display in this pres shell.
uint32_t firstFrameForShell = CurrentPresShellState()->mFirstFrameMarkedForDisplay;
for (uint32_t i = firstFrameForShell;
i < mFramesMarkedForDisplay.Length(); ++i) {
UnmarkFrameForDisplay(mFramesMarkedForDisplay[i]);
}
mFramesMarkedForDisplay.SetLength(firstFrameForShell);
}
void
nsDisplayListBuilder::MarkFramesForDisplayList(nsIFrame* aDirtyFrame,
const nsFrameList& aFrames,
const nsRect& aDirtyRect) {
mFramesMarkedForDisplay.SetCapacity(mFramesMarkedForDisplay.Length() + aFrames.GetLength());
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
mFramesMarkedForDisplay.AppendElement(e.get());
MarkOutOfFlowFrameForDisplay(aDirtyFrame, e.get(), aDirtyRect);
}
}
void
nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(nsIFrame* aDirtyFrame, const nsRect& aDirtyRect)
{
nsAutoTArray<nsIFrame::ChildList,4> childListArray;
aDirtyFrame->GetChildLists(&childListArray);
nsIFrame::ChildListArrayIterator lists(childListArray);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame *child = childFrames.get();
if (child->Preserves3D()) {
mFramesMarkedForDisplay.AppendElement(child);
nsRect dirty = aDirtyRect - child->GetOffsetTo(aDirtyFrame);
child->Properties().Set(nsDisplayListBuilder::Preserve3DDirtyRectProperty(),
new nsRect(dirty));
MarkFrameForDisplay(child, aDirtyFrame);
}
}
}
}
void*
nsDisplayListBuilder::Allocate(size_t aSize) {
void *tmp;
PL_ARENA_ALLOCATE(tmp, &mPool, aSize);
if (!tmp) {
NS_RUNTIMEABORT("out of memory");
}
return tmp;
}
const DisplayItemClip*
nsDisplayListBuilder::AllocateDisplayItemClip(const DisplayItemClip& aOriginal)
{
void* p = Allocate(sizeof(DisplayItemClip));
if (!aOriginal.GetRoundedRectCount()) {
memcpy(p, &aOriginal, sizeof(DisplayItemClip));
return static_cast<DisplayItemClip*>(p);
}
DisplayItemClip* c = new (p) DisplayItemClip(aOriginal);
mDisplayItemClipsToDestroy.AppendElement(c);
return c;
}
const nsIFrame*
nsDisplayListBuilder::FindReferenceFrameFor(const nsIFrame *aFrame,
nsPoint* aOffset)
{
if (aFrame == mCurrentFrame) {
if (aOffset) {
*aOffset = mCurrentOffsetToReferenceFrame;
}
return mCurrentReferenceFrame;
}
for (const nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f))
{
if (f == mReferenceFrame || f->IsTransformed()) {
if (aOffset) {
*aOffset = aFrame->GetOffsetToCrossDoc(f);
}
return f;
}
}
if (aOffset) {
*aOffset = aFrame->GetOffsetToCrossDoc(mReferenceFrame);
}
return mReferenceFrame;
}
void
nsDisplayListBuilder::AdjustWindowDraggingRegion(nsIFrame* aFrame)
{
if (!IsForPainting() || IsInSubdocument() || IsInTransform()) {
return;
}
// We do some basic visibility checking on the frame's border box here.
// We intersect it both with the current dirty rect and with the current
// clip. Either one is just a conservative approximation on its own, but
// their intersection luckily works well enough for our purposes, so that
// we don't have to do full-blown visibility computations.
// The most important case we need to handle is the scrolled-off tab:
// If the tab bar overflows, tab parts that are clipped by the scrollbox
// should not be allowed to interfere with the window dragging region. Using
// just the current DisplayItemClip is not enough to cover this case
// completely because clips are reset while building stacking context
// contents, so for example we'd fail to clip frames that have a clip path
// applied to them. But the current dirty rect doesn't get reset in that
// case, so we use it to make this case work.
nsRect borderBox = aFrame->GetRectRelativeToSelf().Intersect(mDirtyRect);
borderBox += ToReferenceFrame(aFrame);
const DisplayItemClip* clip = ClipState().GetCurrentCombinedClip(this);
if (clip) {
borderBox = clip->ApplyNonRoundedIntersection(borderBox);
}
if (!borderBox.IsEmpty()) {
const nsStyleUserInterface* styleUI = aFrame->StyleUserInterface();
if (styleUI->mWindowDragging == NS_STYLE_WINDOW_DRAGGING_DRAG) {
mWindowDraggingRegion.OrWith(borderBox);
} else {
mWindowDraggingRegion.SubOut(borderBox);
}
}
}
void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const
{
aDestination.BorderBackground()->AppendToTop(BorderBackground());
aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds());
aDestination.Floats()->AppendToTop(Floats());
aDestination.Content()->AppendToTop(Content());
aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants());
aDestination.Outlines()->AppendToTop(Outlines());
}
static void
MoveListTo(nsDisplayList* aList, nsTArray<nsDisplayItem*>* aElements) {
nsDisplayItem* item;
while ((item = aList->RemoveBottom()) != nullptr) {
aElements->AppendElement(item);
}
}
nsRect
nsDisplayList::GetBounds(nsDisplayListBuilder* aBuilder) const {
nsRect bounds;
for (nsDisplayItem* i = GetBottom(); i != nullptr; i = i->GetAbove()) {
bounds.UnionRect(bounds, i->GetClippedBounds(aBuilder));
}
return bounds;
}
nsRect
nsDisplayList::GetVisibleRect() const {
nsRect result;
for (nsDisplayItem* i = GetBottom(); i != nullptr; i = i->GetAbove()) {
result.UnionRect(result, i->GetVisibleRect());
}
return result;
}
bool
nsDisplayList::ComputeVisibilityForRoot(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
nsIFrame* aDisplayPortFrame) {
PROFILER_LABEL("nsDisplayList", "ComputeVisibilityForRoot",
js::ProfileEntry::Category::GRAPHICS);
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
return ComputeVisibilityForSublist(aBuilder, aVisibleRegion,
r.GetBounds(), aDisplayPortFrame);
}
static nsRegion
TreatAsOpaque(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder)
{
bool snap;
nsRegion opaque = aItem->GetOpaqueRegion(aBuilder, &snap);
if (aBuilder->IsForPluginGeometry()) {
// Treat all leaf chrome items as opaque, unless their frames are opacity:0.
// Since opacity:0 frames generate an nsDisplayOpacity, that item will
// not be treated as opaque here, so opacity:0 chrome content will be
// effectively ignored, as it should be.
// We treat leaf chrome items as opaque to ensure that they cover
// content plugins, for security reasons.
// Non-leaf chrome items don't render contents of their own so shouldn't
// be treated as opaque (and their bounds is just the union of their
// children, which might be a large area their contents don't really cover).
nsIFrame* f = aItem->Frame();
if (f->PresContext()->IsChrome() && !aItem->GetChildren() &&
f->StyleDisplay()->mOpacity != 0.0) {
opaque = aItem->GetBounds(aBuilder, &snap);
}
}
if (opaque.IsEmpty()) {
return opaque;
}
nsRegion opaqueClipped;
nsRegionRectIterator iter(opaque);
for (const nsRect* r = iter.Next(); r; r = iter.Next()) {
opaqueClipped.Or(opaqueClipped, aItem->GetClip().ApproximateIntersectInward(*r));
}
return opaqueClipped;
}
bool
nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aListVisibleBounds,
nsIFrame* aDisplayPortFrame) {
#ifdef DEBUG
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
NS_ASSERTION(r.GetBounds().IsEqualInterior(aListVisibleBounds),
"bad aListVisibleBounds");
#endif
bool anyVisible = false;
nsAutoTArray<nsDisplayItem*, 512> elements;
MoveListTo(this, &elements);
for (int32_t i = elements.Length() - 1; i >= 0; --i) {
nsDisplayItem* item = elements[i];
nsRect bounds = item->GetClippedBounds(aBuilder);
nsRegion itemVisible;
itemVisible.And(*aVisibleRegion, bounds);
item->mVisibleRect = itemVisible.GetBounds();
if (item->ComputeVisibility(aBuilder, aVisibleRegion)) {
anyVisible = true;
nsRegion opaque = TreatAsOpaque(item, aBuilder);
// Subtract opaque item from the visible region
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
}
AppendToBottom(item);
}
mIsOpaque = !aVisibleRegion->Intersects(aListVisibleBounds);
return anyVisible;
}
void nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
uint32_t aFlags) {
PROFILER_LABEL("nsDisplayList", "PaintRoot",
js::ProfileEntry::Category::GRAPHICS);
PaintForFrame(aBuilder, aCtx, aBuilder->RootReferenceFrame(), aFlags);
}
/**
* We paint by executing a layer manager transaction, constructing a
* single layer representing the display list, and then making it the
* root of the layer manager, drawing into the PaintedLayers.
*/
void nsDisplayList::PaintForFrame(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
nsIFrame* aForFrame,
uint32_t aFlags) {
nsRefPtr<LayerManager> layerManager;
bool widgetTransaction = false;
bool allowRetaining = false;
bool doBeginTransaction = true;
nsView *view = nullptr;
if (aFlags & PAINT_USE_WIDGET_LAYERS) {
nsIFrame* rootReferenceFrame = aBuilder->RootReferenceFrame();
view = rootReferenceFrame->GetView();
NS_ASSERTION(rootReferenceFrame == nsLayoutUtils::GetDisplayRootFrame(rootReferenceFrame),
"Reference frame must be a display root for us to use the layer manager");
nsIWidget* window = rootReferenceFrame->GetNearestWidget();
if (window) {
layerManager = window->GetLayerManager(&allowRetaining);
if (layerManager) {
doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION);
widgetTransaction = true;
}
}
}
if (!layerManager) {
if (!aCtx) {
NS_WARNING("Nowhere to paint into");
return;
}
layerManager = new BasicLayerManager(BasicLayerManager::BLM_OFFSCREEN);
}
// Store the existing layer builder to reinstate it on return.
FrameLayerBuilder *oldBuilder = layerManager->GetLayerBuilder();
FrameLayerBuilder *layerBuilder = new FrameLayerBuilder();
layerBuilder->Init(aBuilder, layerManager);
if (aFlags & PAINT_COMPRESSED) {
layerBuilder->SetLayerTreeCompressionMode();
}
if (aFlags & PAINT_FLUSH_LAYERS) {
FrameLayerBuilder::InvalidateAllLayers(layerManager);
}
if (doBeginTransaction) {
if (aCtx) {
layerManager->BeginTransactionWithTarget(aCtx->ThebesContext());
} else {
layerManager->BeginTransaction();
}
}
if (widgetTransaction) {
layerBuilder->DidBeginRetainedLayerTransaction(layerManager);
}
nsPresContext* presContext = aForFrame->PresContext();
nsIPresShell* presShell = presContext->GetPresShell();
NotifySubDocInvalidationFunc computeInvalidFunc =
presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
bool computeInvalidRect = (computeInvalidFunc ||
(!layerManager->IsCompositingCheap() && layerManager->NeedsWidgetInvalidation())) &&
widgetTransaction;
UniquePtr<LayerProperties> props;
if (computeInvalidRect) {
props = Move(LayerProperties::CloneFrom(layerManager->GetRoot()));
}
ContainerLayerParameters containerParameters
(presShell->GetXResolution(), presShell->GetYResolution());
nsRefPtr<ContainerLayer> root = layerBuilder->
BuildContainerLayerFor(aBuilder, layerManager, aForFrame, nullptr, this,
containerParameters, nullptr);
nsIDocument* document = nullptr;
if (presShell) {
document = presShell->GetDocument();
}
if (!root) {
layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder);
return;
}
// Root is being scaled up by the X/Y resolution. Scale it back down.
root->SetPostScale(1.0f/containerParameters.mXScale,
1.0f/containerParameters.mYScale);
bool isRoot = presContext->IsRootContentDocument();
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
nsRect viewport(aBuilder->ToReferenceFrame(aForFrame), aForFrame->GetSize());
root->SetFrameMetrics(
nsDisplayScrollLayer::ComputeFrameMetrics(aForFrame, rootScrollFrame,
aBuilder->FindReferenceFrameFor(aForFrame),
root, FrameMetrics::NULL_SCROLL_ID, viewport,
!isRoot, isRoot, containerParameters));
// NS_WARNING is debug-only, so don't even bother checking the conditions in
// a release build.
#ifdef DEBUG
bool usingDisplayport = false;
if (rootScrollFrame) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayport = nsLayoutUtils::GetDisplayPort(content, nullptr);
}
}
if (usingDisplayport &&
!(root->GetContentFlags() & Layer::CONTENT_OPAQUE) &&
SpammyLayoutWarningsEnabled()) {
// See bug 693938, attachment 567017
NS_WARNING("Transparent content with displayports can be expensive.");
}
#endif
layerManager->SetRoot(root);
layerBuilder->WillEndTransaction();
if (widgetTransaction ||
// SVG-as-an-image docs don't paint as part of the retained layer tree,
// but they still need the invalidation state bits cleared in order for
// invalidation for CSS/SMIL animation to work properly.
(document && document->IsBeingUsedAsImage())) {
aForFrame->ClearInvalidationStateBits();
}
bool temp = aBuilder->SetIsCompositingCheap(layerManager->IsCompositingCheap());
LayerManager::EndTransactionFlags flags = LayerManager::END_DEFAULT;
if (layerManager->NeedsWidgetInvalidation()) {
if (aFlags & PAINT_NO_COMPOSITE) {
flags = LayerManager::END_NO_COMPOSITE;
}
} else {
// Client layer managers never composite directly, so
// we don't need to worry about END_NO_COMPOSITE.
if (aBuilder->WillComputePluginGeometry()) {
flags = LayerManager::END_NO_REMOTE_COMPOSITE;
}
}
MaybeSetupTransactionIdAllocator(layerManager, view);
layerManager->EndTransaction(FrameLayerBuilder::DrawPaintedLayer,
aBuilder, flags);
aBuilder->SetIsCompositingCheap(temp);
layerBuilder->DidEndTransaction();
nsIntRegion invalid;
if (props) {
invalid = props->ComputeDifferences(root, computeInvalidFunc);
} else if (widgetTransaction) {
LayerProperties::ClearInvalidations(root);
}
bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
if (view) {
if (props) {
if (!invalid.IsEmpty()) {
nsIntRect bounds = invalid.GetBounds();
nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
presContext->DevPixelsToAppUnits(bounds.y),
presContext->DevPixelsToAppUnits(bounds.width),
presContext->DevPixelsToAppUnits(bounds.height));
if (shouldInvalidate) {
view->GetViewManager()->InvalidateViewNoSuppression(view, rect);
}
presContext->NotifyInvalidation(bounds, 0);
}
} else if (shouldInvalidate) {
view->GetViewManager()->InvalidateView(view);
}
}
if (aFlags & PAINT_FLUSH_LAYERS) {
FrameLayerBuilder::InvalidateAllLayers(layerManager);
}
layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder);
}
uint32_t nsDisplayList::Count() const {
uint32_t count = 0;
for (nsDisplayItem* i = GetBottom(); i; i = i->GetAbove()) {
++count;
}
return count;
}
nsDisplayItem* nsDisplayList::RemoveBottom() {
nsDisplayItem* item = mSentinel.mAbove;
if (!item)
return nullptr;
mSentinel.mAbove = item->mAbove;
if (item == mTop) {
// must have been the only item
mTop = &mSentinel;
}
item->mAbove = nullptr;
return item;
}
void nsDisplayList::DeleteAll() {
nsDisplayItem* item;
while ((item = RemoveBottom()) != nullptr) {
item->~nsDisplayItem();
}
}
static bool
GetMouseThrough(const nsIFrame* aFrame)
{
if (!aFrame->IsBoxFrame())
return false;
const nsIFrame* frame = aFrame;
while (frame) {
if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_ALWAYS) {
return true;
} else if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_NEVER) {
return false;
}
frame = nsBox::GetParentBox(frame);
}
return false;
}
static bool
IsFrameReceivingPointerEvents(nsIFrame* aFrame)
{
nsSubDocumentFrame* frame = do_QueryFrame(aFrame);
if (frame && frame->PassPointerEventsToChildren()) {
return true;
}
return NS_STYLE_POINTER_EVENTS_NONE !=
aFrame->StyleVisibility()->GetEffectivePointerEvents(aFrame);
}
// A list of frames, and their z depth. Used for sorting
// the results of hit testing.
struct FramesWithDepth
{
explicit FramesWithDepth(float aDepth) :
mDepth(aDepth)
{}
bool operator<(const FramesWithDepth& aOther) const {
if (mDepth != aOther.mDepth) {
// We want to sort so that the shallowest item (highest depth value) is first
return mDepth > aOther.mDepth;
}
return this < &aOther;
}
bool operator==(const FramesWithDepth& aOther) const {
return this == &aOther;
}
float mDepth;
nsTArray<nsIFrame*> mFrames;
};
// Sort the frames by depth and then moves all the contained frames to the destination
void FlushFramesArray(nsTArray<FramesWithDepth>& aSource, nsTArray<nsIFrame*>* aDest)
{
if (aSource.IsEmpty()) {
return;
}
aSource.Sort();
uint32_t length = aSource.Length();
for (uint32_t i = 0; i < length; i++) {
aDest->MoveElementsFrom(aSource[i].mFrames);
}
aSource.Clear();
}
void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames) const {
int32_t itemBufferStart = aState->mItemBuffer.Length();
nsDisplayItem* item;
for (item = GetBottom(); item; item = item->GetAbove()) {
aState->mItemBuffer.AppendElement(item);
}
nsAutoTArray<FramesWithDepth, 16> temp;
for (int32_t i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart; --i) {
// Pop element off the end of the buffer. We want to shorten the buffer
// so that recursive calls to HitTest have more buffer space.
item = aState->mItemBuffer[i];
aState->mItemBuffer.SetLength(i);
bool snap;
nsRect r = item->GetBounds(aBuilder, &snap).Intersect(aRect);
if (item->GetClip().MayIntersect(r)) {
nsAutoTArray<nsIFrame*, 16> outFrames;
item->HitTest(aBuilder, aRect, aState, &outFrames);
// For 3d transforms with preserve-3d we add hit frames into the temp list
// so we can sort them later, otherwise we add them directly to the output list.
nsTArray<nsIFrame*> *writeFrames = aOutFrames;
if (item->GetType() == nsDisplayItem::TYPE_TRANSFORM &&
item->Frame()->Preserves3D()) {
if (outFrames.Length()) {
nsDisplayTransform *transform = static_cast<nsDisplayTransform*>(item);
nsPoint point = aRect.TopLeft();
// A 1x1 rect means a point, otherwise use the center of the rect
if (aRect.width != 1 || aRect.height != 1) {
point = aRect.Center();
}
temp.AppendElement(FramesWithDepth(transform->GetHitDepthAtPoint(aBuilder, point)));
writeFrames = &temp[temp.Length() - 1].mFrames;
}
} else {
// We may have just finished a run of consecutive preserve-3d transforms,
// so flush these into the destination array before processing our frame list.
FlushFramesArray(temp, aOutFrames);
}
for (uint32_t j = 0; j < outFrames.Length(); j++) {
nsIFrame *f = outFrames.ElementAt(j);
// Handle the XUL 'mousethrough' feature and 'pointer-events'.
if (!GetMouseThrough(f) && IsFrameReceivingPointerEvents(f)) {
writeFrames->AppendElement(f);
}
}
}
}
// Clear any remaining preserve-3d transforms.
FlushFramesArray(temp, aOutFrames);
NS_ASSERTION(aState->mItemBuffer.Length() == uint32_t(itemBufferStart),
"How did we forget to pop some elements?");
}
static void Sort(nsDisplayList* aList, int32_t aCount, nsDisplayList::SortLEQ aCmp,
void* aClosure) {
if (aCount < 2)
return;
nsDisplayList list1;
nsDisplayList list2;
int i;
int32_t half = aCount/2;
bool sorted = true;
nsDisplayItem* prev = nullptr;
for (i = 0; i < aCount; ++i) {
nsDisplayItem* item = aList->RemoveBottom();
(i < half ? &list1 : &list2)->AppendToTop(item);
if (sorted && prev && !aCmp(prev, item, aClosure)) {
sorted = false;
}
prev = item;
}
if (sorted) {
aList->AppendToTop(&list1);
aList->AppendToTop(&list2);
return;
}
Sort(&list1, half, aCmp, aClosure);
Sort(&list2, aCount - half, aCmp, aClosure);
for (i = 0; i < aCount; ++i) {
if (list1.GetBottom() &&
(!list2.GetBottom() ||
aCmp(list1.GetBottom(), list2.GetBottom(), aClosure))) {
aList->AppendToTop(list1.RemoveBottom());
} else {
aList->AppendToTop(list2.RemoveBottom());
}
}
}
static nsIContent* FindContentInDocument(nsDisplayItem* aItem, nsIDocument* aDoc) {
nsIFrame* f = aItem->Frame();
while (f) {
nsPresContext* pc = f->PresContext();
if (pc->Document() == aDoc) {
return f->GetContent();
}
f = nsLayoutUtils::GetCrossDocParentFrame(pc->PresShell()->GetRootFrame());
}
return nullptr;
}
static bool IsContentLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
nsIContent* commonAncestor = static_cast<nsIContent*>(aClosure);
// It's possible that the nsIContent for aItem1 or aItem2 is in a subdocument
// of commonAncestor, because display items for subdocuments have been
// mixed into the same list. Ensure that we're looking at content
// in commonAncestor's document.
nsIDocument* commonAncestorDoc = commonAncestor->OwnerDoc();
nsIContent* content1 = FindContentInDocument(aItem1, commonAncestorDoc);
nsIContent* content2 = FindContentInDocument(aItem2, commonAncestorDoc);
if (!content1 || !content2) {
NS_ERROR("Document trees are mixed up!");
// Something weird going on
return true;
}
return nsLayoutUtils::CompareTreePosition(content1, content2, commonAncestor) <= 0;
}
static bool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
// Note that we can't just take the difference of the two
// z-indices here, because that might overflow a 32-bit int.
return aItem1->ZIndex() <= aItem2->ZIndex();
}
void nsDisplayList::SortByZOrder(nsDisplayListBuilder* aBuilder,
nsIContent* aCommonAncestor) {
Sort(aBuilder, IsZOrderLEQ, aCommonAncestor);
}
void nsDisplayList::SortByContentOrder(nsDisplayListBuilder* aBuilder,
nsIContent* aCommonAncestor) {
Sort(aBuilder, IsContentLEQ, aCommonAncestor);
}
void nsDisplayList::Sort(nsDisplayListBuilder* aBuilder,
SortLEQ aCmp, void* aClosure) {
::Sort(this, Count(), aCmp, aClosure);
}
nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: mFrame(aFrame)
, mClip(aBuilder->ClipState().GetCurrentCombinedClip(aBuilder))
#ifdef MOZ_DUMP_PAINTING
, mPainted(false)
#endif
{
mReferenceFrame = aBuilder->FindReferenceFrameFor(aFrame, &mToReferenceFrame);
NS_ASSERTION(aBuilder->GetDirtyRect().width >= 0 ||
!aBuilder->IsForPainting(), "dirty rect not set");
// The dirty rect is for mCurrentFrame, so we have to use
// mCurrentOffsetToReferenceFrame
mVisibleRect = aBuilder->GetDirtyRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
}
void
nsDisplayItem::AddInvalidRegionForSyncDecodeBackgroundImages(
nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
if (aBuilder->ShouldSyncDecodeImages()) {
if (!nsCSSRendering::AreAllBackgroundImagesDecodedForFrame(mFrame)) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
}
}
/* static */ bool
nsDisplayItem::ForceActiveLayers()
{
static bool sForce = false;
static bool sForceCached = false;
if (!sForceCached) {
Preferences::AddBoolVarCache(&sForce, "layers.force-active", false);
sForceCached = true;
}
return sForce;
}
/* static */ int32_t
nsDisplayItem::MaxActiveLayers()
{
static int32_t sMaxLayers = false;
static bool sMaxLayersCached = false;
if (!sMaxLayersCached) {
Preferences::AddIntVarCache(&sMaxLayers, "layers.max-active", -1);
sMaxLayersCached = true;
}
return sMaxLayers;
}
int32_t
nsDisplayItem::ZIndex() const
{
if (!mFrame->IsPositioned() && !mFrame->IsFlexOrGridItem())
return 0;
const nsStylePosition* position = mFrame->StylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer)
return position->mZIndex.GetIntValue();
// sort the auto and 0 elements together
return 0;
}
bool
nsDisplayItem::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion)
{
return !mVisibleRect.IsEmpty() &&
!IsInvisibleInRect(aVisibleRegion->GetBounds());
}
bool
nsDisplayItem::RecomputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
nsRect bounds = GetClippedBounds(aBuilder);
nsRegion itemVisible;
itemVisible.And(*aVisibleRegion, bounds);
mVisibleRect = itemVisible.GetBounds();
// When we recompute visibility within layers we don't need to
// expand the visible region for content behind plugins (the plugin
// is not in the layer).
if (!ComputeVisibility(aBuilder, aVisibleRegion)) {
mVisibleRect = nsRect();
return false;
}
nsRegion opaque = TreatAsOpaque(this, aBuilder);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque);
return true;
}
nsRect
nsDisplayItem::GetClippedBounds(nsDisplayListBuilder* aBuilder)
{
bool snap;
nsRect r = GetBounds(aBuilder, &snap);
return GetClip().ApplyNonRoundedIntersection(r);
}
nsRect
nsDisplaySolidColor::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
*aSnap = true;
return mBounds;
}
void
nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
aCtx->SetColor(mColor);
aCtx->FillRect(mVisibleRect);
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplaySolidColor::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (rgba %d,%d,%d,%d)",
NS_GET_R(mColor), NS_GET_G(mColor),
NS_GET_B(mColor), NS_GET_A(mColor));
}
#endif
static void
RegisterThemeGeometry(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
{
if (!aBuilder->IsInSubdocument() && !aBuilder->IsInTransform()) {
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
nsRect borderBox(aFrame->GetOffsetTo(displayRoot), aFrame->GetSize());
aBuilder->RegisterThemeGeometry(aFrame->StyleDisplay()->mAppearance,
borderBox.ToNearestPixels(aFrame->PresContext()->AppUnitsPerDevPixel()));
}
}
nsDisplayBackgroundImage::nsDisplayBackgroundImage(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
uint32_t aLayer,
const nsStyleBackground* aBackgroundStyle)
: nsDisplayImageContainer(aBuilder, aFrame)
, mBackgroundStyle(aBackgroundStyle)
, mLayer(aLayer)
{
MOZ_COUNT_CTOR(nsDisplayBackgroundImage);
mBounds = GetBoundsInternal(aBuilder);
}
nsDisplayBackgroundImage::~nsDisplayBackgroundImage()
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_DTOR(nsDisplayBackgroundImage);
#endif
}
static nsStyleContext* GetBackgroundStyleContext(nsIFrame* aFrame)
{
nsStyleContext *sc;
if (!nsCSSRendering::FindBackground(aFrame, &sc)) {
// We don't want to bail out if moz-appearance is set on a root
// node. If it has a parent content node, bail because it's not
// a root, other wise keep going in order to let the theme stuff
// draw the background. The canvas really should be drawing the
// bg, but there's no way to hook that up via css.
if (!aFrame->StyleDisplay()->mAppearance) {
return nullptr;
}
nsIContent* content = aFrame->GetContent();
if (!content || content->GetParent()) {
return nullptr;
}
sc = aFrame->StyleContext();
}
return sc;
}
/* static */ void
SetBackgroundClipRegion(DisplayListClipState::AutoSaveRestore& aClipState,
nsIFrame* aFrame, const nsPoint& aToReferenceFrame,
const nsStyleBackground::Layer& aLayer,
bool aWillPaintBorder)
{
nsRect borderBox = nsRect(aToReferenceFrame, aFrame->GetSize());
nsCSSRendering::BackgroundClipState clip;
nsCSSRendering::GetBackgroundClip(aLayer, aFrame, *aFrame->StyleBorder(),
borderBox, borderBox, aWillPaintBorder,
aFrame->PresContext()->AppUnitsPerDevPixel(),
&clip);
if (clip.mHasAdditionalBGClipArea) {
aClipState.ClipContentDescendants(clip.mAdditionalBGClipArea, clip.mBGClipArea,
clip.mHasRoundedCorners ? clip.mRadii : nullptr);
} else {
aClipState.ClipContentDescendants(clip.mBGClipArea, clip.mHasRoundedCorners ? clip.mRadii : nullptr);
}
}
/*static*/ bool
nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
{
nsStyleContext* bgSC = nullptr;
const nsStyleBackground* bg = nullptr;
nsPresContext* presContext = aFrame->PresContext();
bool isThemed = aFrame->IsThemed();
if (!isThemed) {
bgSC = GetBackgroundStyleContext(aFrame);
if (bgSC) {
bg = bgSC->StyleBackground();
}
}
bool drawBackgroundColor = false;
nscolor color;
if (!nsCSSRendering::IsCanvasFrame(aFrame) && bg) {
bool drawBackgroundImage;
color =
nsCSSRendering::DetermineBackgroundColor(presContext, bgSC, aFrame,
drawBackgroundImage, drawBackgroundColor);
}
bool hasInsetShadow = aFrame->StyleBorder()->mBoxShadow &&
aFrame->StyleBorder()->mBoxShadow->HasShadowWithInset(true);
bool willPaintBorder = !isThemed && !hasInsetShadow &&
aFrame->StyleBorder()->HasBorder();
nsPoint toRef = aBuilder->ToReferenceFrame(aFrame);
// An auxiliary list is necessary in case we have background blending; if that
// is the case, background items need to be wrapped by a blend container to
// isolate blending to the background
nsDisplayList bgItemList;
// Even if we don't actually have a background color to paint, we may still need
// to create an item for hit testing.
if ((drawBackgroundColor && color != NS_RGBA(0,0,0,0)) ||
aBuilder->IsForEventDelivery()) {
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (bg && !aBuilder->IsForEventDelivery()) {
SetBackgroundClipRegion(clipState, aFrame, toRef,
bg->BottomLayer(),
willPaintBorder);
}
bgItemList.AppendNewToTop(
new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bg,
drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0)));
}
if (isThemed) {
nsITheme* theme = presContext->GetTheme();
if (theme->NeedToClearBackgroundBehindWidget(aFrame->StyleDisplay()->mAppearance)) {
bgItemList.AppendNewToTop(
new (aBuilder) nsDisplayClearBackground(aBuilder, aFrame));
}
nsDisplayThemedBackground* bgItem =
new (aBuilder) nsDisplayThemedBackground(aBuilder, aFrame);
bgItemList.AppendNewToTop(bgItem);
aList->AppendToTop(&bgItemList);
return true;
}
if (!bg) {
aList->AppendToTop(&bgItemList);
return false;
}
bool needBlendContainer = false;
// Passing bg == nullptr in this macro will result in one iteration with
// i = 0.
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
if (bg->mLayers[i].mImage.IsEmpty()) {
continue;
}
if (bg->mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) {
needBlendContainer = true;
}
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (!aBuilder->IsForEventDelivery()) {
const nsStyleBackground::Layer& layer = bg->mLayers[i];
SetBackgroundClipRegion(clipState, aFrame, toRef,
layer, willPaintBorder);
}
nsDisplayBackgroundImage* bgItem =
new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bg);
bgItemList.AppendNewToTop(bgItem);
}
if (needBlendContainer) {
bgItemList.AppendNewToTop(
new (aBuilder) nsDisplayBlendContainer(aBuilder, aFrame, &bgItemList));
}
aList->AppendToTop(&bgItemList);
return false;
}
// Check that the rounded border of aFrame, added to aToReferenceFrame,
// intersects aRect. Assumes that the unrounded border has already
// been checked for intersection.
static bool
RoundedBorderIntersectsRect(nsIFrame* aFrame,
const nsPoint& aFrameToReferenceFrame,
const nsRect& aTestRect)
{
if (!nsRect(aFrameToReferenceFrame, aFrame->GetSize()).Intersects(aTestRect))
return false;
nscoord radii[8];
return !aFrame->GetBorderRadii(radii) ||
nsLayoutUtils::RoundedRectIntersectsRect(nsRect(aFrameToReferenceFrame,
aFrame->GetSize()),
radii, aTestRect);
}
// Returns TRUE if aContainedRect is guaranteed to be contained in
// the rounded rect defined by aRoundedRect and aRadii. Complex cases are
// handled conservatively by returning FALSE in some situations where
// a more thorough analysis could return TRUE.
//
// See also RoundedRectIntersectsRect.
static bool RoundedRectContainsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect) {
nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(aRoundedRect, aRadii, aContainedRect);
return rgn.Contains(aContainedRect);
}
bool
nsDisplayBackgroundImage::IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder,
const nsRect& aClipRect,
gfxRect* aDestRect)
{
if (!mBackgroundStyle)
return false;
if (mBackgroundStyle->mLayers.Length() != 1)
return false;
nsPresContext* presContext = mFrame->PresContext();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer];
if (layer.mAttachment != NS_STYLE_BG_ATTACHMENT_FIXED)
return false;
nsBackgroundLayerState state =
nsCSSRendering::PrepareBackgroundLayer(presContext, mFrame, flags,
borderArea, aClipRect, layer);
nsImageRenderer* imageRenderer = &state.mImageRenderer;
// We only care about images here, not gradients.
if (!imageRenderer->IsRasterImage())
return false;
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
*aDestRect = nsLayoutUtils::RectToGfxRect(state.mFillArea, appUnitsPerDevPixel);
return true;
}
bool
nsDisplayBackgroundImage::ShouldFixToViewport(LayerManager* aManager)
{
// APZ doesn't (yet) know how to scroll the visible region for these type of
// items, so don't layerize them if it's enabled.
if (nsLayoutUtils::UsesAsyncScrolling() ||
(aManager && aManager->ShouldAvoidComponentAlphaLayers())) {
return false;
}
// Put background-attachment:fixed background images in their own
// compositing layer, unless we have APZ enabled
return mBackgroundStyle->mLayers[mLayer].mAttachment == NS_STYLE_BG_ATTACHMENT_FIXED &&
!mBackgroundStyle->mLayers[mLayer].mImage.IsEmpty();
}
bool
nsDisplayBackgroundImage::TryOptimizeToImageLayer(LayerManager* aManager,
nsDisplayListBuilder* aBuilder)
{
if (!mBackgroundStyle)
return false;
nsPresContext* presContext = mFrame->PresContext();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer];
if (layer.mClip != NS_STYLE_BG_CLIP_BORDER) {
return false;
}
nscoord radii[8];
if (mFrame->GetBorderRadii(radii)) {
return false;
}
nsBackgroundLayerState state =
nsCSSRendering::PrepareBackgroundLayer(presContext, mFrame, flags,
borderArea, borderArea, layer);
nsImageRenderer* imageRenderer = &state.mImageRenderer;
// We only care about images here, not gradients.
if (!imageRenderer->IsRasterImage())
return false;
nsRefPtr<ImageContainer> imageContainer = imageRenderer->GetContainer(aManager);
// Image is not ready to be made into a layer yet
if (!imageContainer)
return false;
// We currently can't handle tiled or partial backgrounds.
if (!state.mDestArea.IsEqualEdges(state.mFillArea)) {
return false;
}
// XXX Ignoring state.mAnchor. ImageLayer drawing snaps mDestArea edges to
// layer pixel boundaries. This should be OK for now.
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
mDestRect = nsLayoutUtils::RectToGfxRect(state.mDestArea, appUnitsPerDevPixel);
mImageContainer = imageContainer;
// Ok, we can turn this into a layer if needed.
return true;
}
already_AddRefed<ImageContainer>
nsDisplayBackgroundImage::GetContainer(LayerManager* aManager,
nsDisplayListBuilder *aBuilder)
{
if (!TryOptimizeToImageLayer(aManager, aBuilder)) {
return nullptr;
}
nsRefPtr<ImageContainer> container = mImageContainer;
return container.forget();
}
LayerState
nsDisplayBackgroundImage::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
bool animated = false;
if (mBackgroundStyle) {
const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer];
const nsStyleImage* image = &layer.mImage;
if (image->GetType() == eStyleImageType_Image) {
imgIRequest* imgreq = image->GetImageData();
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(imgreq->GetImage(getter_AddRefs(image))) && image) {
if (NS_FAILED(image->GetAnimated(&animated))) {
animated = false;
}
}
}
}
if (!animated ||
!nsLayoutUtils::AnimatedImageLayersEnabled()) {
if (!aManager->IsCompositingCheap() ||
!nsLayoutUtils::GPUImageScalingEnabled()) {
return LAYER_NONE;
}
}
if (!TryOptimizeToImageLayer(aManager, aBuilder)) {
return LAYER_NONE;
}
if (!animated) {
mozilla::gfx::IntSize imageSize = mImageContainer->GetCurrentSize();
NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!");
gfxRect destRect = mDestRect;
destRect.width *= aParameters.mXScale;
destRect.height *= aParameters.mYScale;
// Calculate the scaling factor for the frame.
gfxSize scale = gfxSize(destRect.width / imageSize.width, destRect.height / imageSize.height);
// If we are not scaling at all, no point in separating this into a layer.
if (scale.width == 1.0f && scale.height == 1.0f) {
return LAYER_NONE;
}
// If the target size is pretty small, no point in using a layer.
if (destRect.width * destRect.height < 64 * 64) {
return LAYER_NONE;
}
}
return LAYER_ACTIVE;
}
already_AddRefed<Layer>
nsDisplayBackgroundImage::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
nsRefPtr<ImageLayer> layer = static_cast<ImageLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateImageLayer();
if (!layer)
return nullptr;
}
layer->SetContainer(mImageContainer);
ConfigureLayer(layer, aParameters.mOffset);
return layer.forget();
}
void
nsDisplayBackgroundImage::ConfigureLayer(ImageLayer* aLayer, const nsIntPoint& aOffset)
{
aLayer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(mFrame));
mozilla::gfx::IntSize imageSize = mImageContainer->GetCurrentSize();
NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!");
gfxPoint p = mDestRect.TopLeft() + aOffset;
Matrix transform = Matrix::Translation(p.x, p.y);
transform.PreScale(mDestRect.width / imageSize.width,
mDestRect.height / imageSize.height);
aLayer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
}
void
nsDisplayBackgroundImage::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
bool
nsDisplayBackgroundImage::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion)
{
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion)) {
return false;
}
// Return false if the background was propagated away from this
// frame. We don't want this display item to show up and confuse
// anything.
return mBackgroundStyle;
}
/* static */ nsRegion
nsDisplayBackgroundImage::GetInsideClipRegion(nsDisplayItem* aItem,
nsPresContext* aPresContext,
uint8_t aClip, const nsRect& aRect,
bool* aSnap)
{
nsRegion result;
if (aRect.IsEmpty())
return result;
nsIFrame *frame = aItem->Frame();
nsRect clipRect;
if (frame->GetType() == nsGkAtoms::canvasFrame) {
nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
clipRect = canvasFrame->CanvasArea() + aItem->ToReferenceFrame();
} else {
switch (aClip) {
case NS_STYLE_BG_CLIP_BORDER:
clipRect = nsRect(aItem->ToReferenceFrame(), frame->GetSize());
break;
case NS_STYLE_BG_CLIP_PADDING:
clipRect = frame->GetPaddingRect() - frame->GetPosition() + aItem->ToReferenceFrame();
break;
case NS_STYLE_BG_CLIP_CONTENT:
clipRect = frame->GetContentRectRelativeToSelf() + aItem->ToReferenceFrame();
break;
default:
NS_NOTREACHED("Unknown clip type");
return result;
}
}
return clipRect.Intersect(aRect);
}
nsRegion
nsDisplayBackgroundImage::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
nsRegion result;
*aSnap = false;
if (!mBackgroundStyle)
return result;
*aSnap = true;
// For NS_STYLE_BOX_DECORATION_BREAK_SLICE, don't try to optimize here, since
// this could easily lead to O(N^2) behavior inside InlineBackgroundData,
// which expects frames to be sent to it in content order, not reverse
// content order which we'll produce here.
// Of course, if there's only one frame in the flow, it doesn't matter.
if (mFrame->StyleBorder()->mBoxDecorationBreak ==
NS_STYLE_BOX_DECORATION_BREAK_CLONE ||
(!mFrame->GetPrevContinuation() && !mFrame->GetNextContinuation())) {
const nsStyleBackground::Layer& layer = mBackgroundStyle->mLayers[mLayer];
if (layer.mImage.IsOpaque() && layer.mBlendMode == NS_STYLE_BLEND_NORMAL) {
nsPresContext* presContext = mFrame->PresContext();
result = GetInsideClipRegion(this, presContext, layer.mClip, mBounds, aSnap);
}
}
return result;
}
bool
nsDisplayBackgroundImage::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
if (!mBackgroundStyle) {
*aColor = NS_RGBA(0,0,0,0);
return true;
}
return false;
}
nsRect
nsDisplayBackgroundImage::GetPositioningArea()
{
if (!mBackgroundStyle) {
return nsRect();
}
nsIFrame* attachedToFrame;
return nsCSSRendering::ComputeBackgroundPositioningArea(
mFrame->PresContext(), mFrame,
nsRect(ToReferenceFrame(), mFrame->GetSize()),
mBackgroundStyle->mLayers[mLayer],
&attachedToFrame) + ToReferenceFrame();
}
bool
nsDisplayBackgroundImage::RenderingMightDependOnPositioningAreaSizeChange()
{
if (!mBackgroundStyle)
return false;
nscoord radii[8];
if (mFrame->GetBorderRadii(radii)) {
// A change in the size of the positioning area might change the position
// of the rounded corners.
return true;
}
const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer];
if (layer.RenderingMightDependOnPositioningAreaSizeChange()) {
return true;
}
return false;
}
static void CheckForBorderItem(nsDisplayItem *aItem, uint32_t& aFlags)
{
nsDisplayItem* nextItem = aItem->GetAbove();
while (nextItem && nextItem->GetType() == nsDisplayItem::TYPE_BACKGROUND) {
nextItem = nextItem->GetAbove();
}
if (nextItem &&
nextItem->Frame() == aItem->Frame() &&
nextItem->GetType() == nsDisplayItem::TYPE_BORDER) {
aFlags |= nsCSSRendering::PAINTBG_WILL_PAINT_BORDER;
}
}
void
nsDisplayBackgroundImage::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
PaintInternal(aBuilder, aCtx, mVisibleRect, &mBounds);
}
void
nsDisplayBackgroundImage::PaintInternal(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx, const nsRect& aBounds,
nsRect* aClipRect) {
nsPoint offset = ToReferenceFrame();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
CheckForBorderItem(this, flags);
nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame,
aBounds,
nsRect(offset, mFrame->GetSize()),
flags, aClipRect, mLayer);
}
void nsDisplayBackgroundImage::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
if (!mBackgroundStyle) {
return;
}
const nsDisplayBackgroundGeometry* geometry = static_cast<const nsDisplayBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (positioningArea.TopLeft() != geometry->mPositioningArea.TopLeft() ||
(positioningArea.Size() != geometry->mPositioningArea.Size() &&
RenderingMightDependOnPositioningAreaSizeChange())) {
// Positioning area changed in a way that could cause everything to change,
// so invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
if (positioningArea.Size() != geometry->mPositioningArea.Size()) {
NotifyRenderingChanged();
}
return;
}
if (aBuilder->ShouldSyncDecodeImages()) {
if (mBackgroundStyle &&
!nsCSSRendering::IsBackgroundImageDecodedForStyleContextAndLayer(mBackgroundStyle, mLayer)) {
aInvalidRegion->Or(*aInvalidRegion, bounds);
NotifyRenderingChanged();
}
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
NotifyRenderingChanged();
}
}
nsRect
nsDisplayBackgroundImage::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = true;
return mBounds;
}
nsRect
nsDisplayBackgroundImage::GetBoundsInternal(nsDisplayListBuilder* aBuilder) {
nsPresContext* presContext = mFrame->PresContext();
if (!mBackgroundStyle) {
return nsRect();
}
nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize());
nsRect clipRect = borderBox;
if (mFrame->GetType() == nsGkAtoms::canvasFrame) {
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
clipRect = frame->CanvasArea() + ToReferenceFrame();
}
const nsStyleBackground::Layer& layer = mBackgroundStyle->mLayers[mLayer];
return nsCSSRendering::GetBackgroundLayerRect(presContext, mFrame,
borderBox, clipRect, layer,
aBuilder->GetBackgroundPaintFlags());
}
uint32_t
nsDisplayBackgroundImage::GetPerFrameKey()
{
return (mLayer << nsDisplayItem::TYPE_BITS) |
nsDisplayItem::GetPerFrameKey();
}
nsDisplayThemedBackground::nsDisplayThemedBackground(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplayThemedBackground);
const nsStyleDisplay* disp = mFrame->StyleDisplay();
mAppearance = disp->mAppearance;
mFrame->IsThemed(disp, &mThemeTransparency);
// Perform necessary RegisterThemeGeometry
switch (disp->mAppearance) {
case NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR:
case NS_THEME_TOOLBAR:
case NS_THEME_WINDOW_TITLEBAR:
case NS_THEME_WINDOW_BUTTON_BOX:
case NS_THEME_MOZ_MAC_FULLSCREEN_BUTTON:
case NS_THEME_WINDOW_BUTTON_BOX_MAXIMIZED:
case NS_THEME_MAC_VIBRANCY_LIGHT:
case NS_THEME_MAC_VIBRANCY_DARK:
RegisterThemeGeometry(aBuilder, aFrame);
break;
case NS_THEME_WIN_BORDERLESS_GLASS:
case NS_THEME_WIN_GLASS:
aBuilder->SetGlassDisplayItem(this);
break;
}
mBounds = GetBoundsInternal();
}
nsDisplayThemedBackground::~nsDisplayThemedBackground()
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_DTOR(nsDisplayThemedBackground);
#endif
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayThemedBackground::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (themed, appearance:%d)", mAppearance);
}
#endif
void
nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
// Assume that any point in our border rect is a hit.
if (nsRect(ToReferenceFrame(), mFrame->GetSize()).Intersects(aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
nsRegion
nsDisplayThemedBackground::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
nsRegion result;
*aSnap = false;
if (mThemeTransparency == nsITheme::eOpaque) {
result = nsRect(ToReferenceFrame(), mFrame->GetSize());
}
return result;
}
bool
nsDisplayThemedBackground::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
if (mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
mAppearance == NS_THEME_WIN_GLASS) {
*aColor = NS_RGBA(0,0,0,0);
return true;
}
return false;
}
nsRect
nsDisplayThemedBackground::GetPositioningArea()
{
return nsRect(ToReferenceFrame(), mFrame->GetSize());
}
void
nsDisplayThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
PaintInternal(aBuilder, aCtx, mVisibleRect, nullptr);
}
void
nsDisplayThemedBackground::PaintInternal(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx, const nsRect& aBounds,
nsRect* aClipRect)
{
// XXXzw this ignores aClipRect.
nsPresContext* presContext = mFrame->PresContext();
nsITheme *theme = presContext->GetTheme();
nsRect borderArea(ToReferenceFrame(), mFrame->GetSize());
nsRect drawing(borderArea);
theme->GetWidgetOverflow(presContext->DeviceContext(), mFrame, mAppearance,
&drawing);
drawing.IntersectRect(drawing, aBounds);
theme->DrawWidgetBackground(aCtx, mFrame, mAppearance, borderArea, drawing);
}
bool nsDisplayThemedBackground::IsWindowActive()
{
EventStates docState = mFrame->GetContent()->OwnerDoc()->GetDocumentState();
return !docState.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE);
}
void nsDisplayThemedBackground::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsDisplayThemedBackgroundGeometry* geometry = static_cast<const nsDisplayThemedBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (!positioningArea.IsEqualInterior(geometry->mPositioningArea)) {
// Invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
}
nsITheme* theme = mFrame->PresContext()->GetTheme();
if (theme->WidgetAppearanceDependsOnWindowFocus(mAppearance) &&
IsWindowActive() != geometry->mWindowIsActive) {
aInvalidRegion->Or(*aInvalidRegion, bounds);
}
}
nsRect
nsDisplayThemedBackground::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = true;
return mBounds;
}
nsRect
nsDisplayThemedBackground::GetBoundsInternal() {
nsPresContext* presContext = mFrame->PresContext();
nsRect r(nsPoint(0,0), mFrame->GetSize());
presContext->GetTheme()->
GetWidgetOverflow(presContext->DeviceContext(), mFrame,
mFrame->StyleDisplay()->mAppearance, &r);
#ifdef XP_MACOSX
// Bug 748219
r.Inflate(mFrame->PresContext()->AppUnitsPerDevPixel());
#endif
return r + ToReferenceFrame();
}
bool
nsDisplayBackgroundColor::ApplyOpacity(nsDisplayListBuilder* aBuilder,
float aOpacity,
const DisplayItemClip* aClip)
{
mColor.a = mColor.a * aOpacity;
if (aClip) {
IntersectClip(aBuilder, *aClip);
}
return true;
}
void
nsDisplayBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
if (mColor == NS_RGBA(0, 0, 0, 0)) {
return;
}
gfxContext* ctx = aCtx->ThebesContext();
nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize());
gfxRect bounds =
nsLayoutUtils::RectToGfxRect(borderBox, mFrame->PresContext()->AppUnitsPerDevPixel());
ctx->SetColor(mColor);
ctx->NewPath();
ctx->Rectangle(bounds, true);
ctx->Fill();
}
nsRegion
nsDisplayBackgroundColor::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap)
{
if (mColor.a != 1) {
return nsRegion();
}
if (!mBackgroundStyle)
return nsRegion();
*aSnap = true;
const nsStyleBackground::Layer& bottomLayer = mBackgroundStyle->BottomLayer();
nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
return nsDisplayBackgroundImage::GetInsideClipRegion(this, presContext, bottomLayer.mClip, borderBox, aSnap);
}
bool
nsDisplayBackgroundColor::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor)
{
*aColor = NS_RGBA_FROM_GFXRGBA(mColor);
return true;
}
void
nsDisplayBackgroundColor::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayBackgroundColor::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (rgba %f,%f,%f,%f)",
mColor.r, mColor.g,
mColor.b, mColor.a);
}
#endif
already_AddRefed<Layer>
nsDisplayClearBackground::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
nsRefPtr<ColorLayer> layer = static_cast<ColorLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateColorLayer();
if (!layer)
return nullptr;
}
layer->SetColor(NS_RGBA(0, 0, 0, 0));
layer->SetMixBlendMode(gfx::CompositionOp::OP_SOURCE);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
layer->SetBounds(bounds.ToNearestPixels(appUnitsPerDevPixel)); // XXX Do we need to respect the parent layer's scale here?
return layer.forget();
}
nsRect
nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;
return mFrame->GetVisualOverflowRectRelativeToSelf() + ToReferenceFrame();
}
void
nsDisplayOutline::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
// TODO join outlines together
nsPoint offset = ToReferenceFrame();
nsCSSRendering::PaintOutline(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->StyleContext());
}
bool
nsDisplayOutline::IsInvisibleInRect(const nsRect& aRect)
{
const nsStyleOutline* outline = mFrame->StyleOutline();
nsRect borderBox(ToReferenceFrame(), mFrame->GetSize());
if (borderBox.Contains(aRect) &&
!nsLayoutUtils::HasNonZeroCorner(outline->mOutlineRadius)) {
if (outline->mOutlineOffset >= 0) {
// aRect is entirely inside the border-rect, and the outline isn't
// rendered inside the border-rect, so the outline is not visible.
return true;
}
}
return false;
}
void
nsDisplayEventReceiver::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
void
nsDisplayLayerEventRegions::AddFrame(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
{
NS_ASSERTION(aBuilder->FindReferenceFrameFor(aFrame) == aBuilder->FindReferenceFrameFor(mFrame),
"Reference frame mismatch");
uint8_t pointerEvents = aFrame->StyleVisibility()->mPointerEvents;
if (pointerEvents == NS_STYLE_POINTER_EVENTS_NONE) {
return;
}
// XXX handle other pointerEvents values for SVG
// XXX Do something clever here for the common case where the border box
// is obviously entirely inside mHitRegion.
nsRect borderBox(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize());
const DisplayItemClip* clip = aBuilder->ClipState().GetCurrentCombinedClip(aBuilder);
bool borderBoxHasRoundedCorners =
nsLayoutUtils::HasNonZeroCorner(aFrame->StyleBorder()->mBorderRadius);
if (clip) {
borderBox = clip->ApplyNonRoundedIntersection(borderBox);
if (clip->GetRoundedRectCount() > 0) {
borderBoxHasRoundedCorners = true;
}
}
if (borderBoxHasRoundedCorners ||
(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
mMaybeHitRegion.Or(mMaybeHitRegion, borderBox);
} else {
mHitRegion.Or(mHitRegion, borderBox);
}
if (aBuilder->GetAncestorHasTouchEventHandler()) {
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox);
}
}
nsDisplayCaret::nsDisplayCaret(nsDisplayListBuilder* aBuilder,
nsIFrame* aCaretFrame)
: nsDisplayItem(aBuilder, aCaretFrame)
, mCaret(aBuilder->GetCaret())
, mBounds(aBuilder->GetCaretRect() + ToReferenceFrame())
{
MOZ_COUNT_CTOR(nsDisplayCaret);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayCaret::~nsDisplayCaret()
{
MOZ_COUNT_DTOR(nsDisplayCaret);
}
#endif
nsRect
nsDisplayCaret::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
*aSnap = true;
// The caret returns a rect in the coordinates of mFrame.
return mBounds;
}
void
nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
// Note: Because we exist, we know that the caret is visible, so we don't
// need to check for the caret's visibility.
mCaret->PaintCaret(aBuilder, aCtx, mFrame, ToReferenceFrame());
}
bool
nsDisplayBorder::IsInvisibleInRect(const nsRect& aRect)
{
nsRect paddingRect = mFrame->GetPaddingRect() - mFrame->GetPosition() +
ToReferenceFrame();
const nsStyleBorder *styleBorder;
if (paddingRect.Contains(aRect) &&
!(styleBorder = mFrame->StyleBorder())->IsBorderImageLoaded() &&
!nsLayoutUtils::HasNonZeroCorner(styleBorder->mBorderRadius)) {
// aRect is entirely inside the content rect, and no part
// of the border is rendered inside the content rect, so we are not
// visible
// Skip this if there's a border-image (which draws a background
// too) or if there is a border-radius (which makes the border draw
// further in).
return true;
}
return false;
}
nsDisplayItemGeometry*
nsDisplayBorder::AllocateGeometry(nsDisplayListBuilder* aBuilder)
{
return new nsDisplayBorderGeometry(this, aBuilder);
}
void
nsDisplayBorder::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsDisplayBorderGeometry* geometry = static_cast<const nsDisplayBorderGeometry*>(aGeometry);
bool snap;
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
!geometry->mContentRect.IsEqualInterior(GetContentRect())) {
// We can probably get away with only invalidating the difference
// between the border and padding rects, but the XUL ui at least
// is apparently painting a background with this?
aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
}
}
void
nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->StyleContext(),
mFrame->GetSkipSides());
}
nsRect
nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
*aSnap = true;
return CalculateBounds(*mFrame->StyleBorder());
}
nsRect
nsDisplayBorder::CalculateBounds(const nsStyleBorder& aStyleBorder)
{
nsRect borderBounds(ToReferenceFrame(), mFrame->GetSize());
if (aStyleBorder.IsBorderImageLoaded()) {
borderBounds.Inflate(aStyleBorder.GetImageOutset());
return borderBounds;
} else {
nsMargin border = aStyleBorder.GetComputedBorder();
nsRect result;
if (border.top > 0) {
result = nsRect(borderBounds.X(), borderBounds.Y(), borderBounds.Width(), border.top);
}
if (border.right > 0) {
result.UnionRect(result, nsRect(borderBounds.XMost() - border.right, borderBounds.Y(), border.right, borderBounds.Height()));
}
if (border.bottom > 0) {
result.UnionRect(result, nsRect(borderBounds.X(), borderBounds.YMost() - border.bottom, borderBounds.Width(), border.bottom));
}
if (border.left > 0) {
result.UnionRect(result, nsRect(borderBounds.X(), borderBounds.Y(), border.left, borderBounds.Height()));
}
return result;
}
}
// Given a region, compute a conservative approximation to it as a list
// of rectangles that aren't vertically adjacent (i.e., vertically
// adjacent or overlapping rectangles are combined).
// Right now this is only approximate, some vertically overlapping rectangles
// aren't guaranteed to be combined.
static void
ComputeDisjointRectangles(const nsRegion& aRegion,
nsTArray<nsRect>* aRects) {
nscoord accumulationMargin = nsPresContext::CSSPixelsToAppUnits(25);
nsRect accumulated;
nsRegionRectIterator iter(aRegion);
while (true) {
const nsRect* r = iter.Next();
if (r && !accumulated.IsEmpty() &&
accumulated.YMost() >= r->y - accumulationMargin) {
accumulated.UnionRect(accumulated, *r);
continue;
}
if (!accumulated.IsEmpty()) {
aRects->AppendElement(accumulated);
accumulated.SetEmpty();
}
if (!r)
break;
accumulated = *r;
}
}
void
nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
PROFILER_LABEL("nsDisplayBoxShadowOuter", "Paint",
js::ProfileEntry::Category::GRAPHICS);
for (uint32_t i = 0; i < rects.Length(); ++i) {
nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame,
borderRect, rects[i], mOpacity);
}
}
nsRect
nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;
return mBounds;
}
nsRect
nsDisplayBoxShadowOuter::GetBoundsInternal() {
return nsLayoutUtils::GetBoxShadowRectForFrame(mFrame, mFrame->GetSize()) +
ToReferenceFrame();
}
bool
nsDisplayBoxShadowOuter::IsInvisibleInRect(const nsRect& aRect)
{
nsPoint origin = ToReferenceFrame();
nsRect frameRect(origin, mFrame->GetSize());
if (!frameRect.Contains(aRect))
return false;
// the visible region is entirely inside the border-rect, and box shadows
// never render within the border-rect (unless there's a border radius).
nscoord twipsRadii[8];
bool hasBorderRadii = mFrame->GetBorderRadii(twipsRadii);
if (!hasBorderRadii)
return true;
return RoundedRectContainsRect(frameRect, twipsRadii, aRect);
}
bool
nsDisplayBoxShadowOuter::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion)) {
return false;
}
// Store the actual visible region
mVisibleRegion.And(*aVisibleRegion, mVisibleRect);
return true;
}
void
nsDisplayBoxShadowOuter::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsDisplayBoxShadowOuterGeometry* geometry =
static_cast<const nsDisplayBoxShadowOuterGeometry*>(aGeometry);
bool snap;
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
!geometry->mBorderRect.IsEqualInterior(GetBorderRect()) ||
mOpacity != geometry->mOpacity) {
nsRegion oldShadow, newShadow;
nscoord dontCare[8];
bool hasBorderRadius = mFrame->GetBorderRadii(dontCare);
if (hasBorderRadius) {
// If we have rounded corners then we need to invalidate the frame area
// too since we paint into it.
oldShadow = geometry->mBounds;
newShadow = GetBounds(aBuilder, &snap);
} else {
oldShadow = oldShadow.Sub(geometry->mBounds, geometry->mBorderRect);
newShadow = newShadow.Sub(GetBounds(aBuilder, &snap), GetBorderRect());
}
aInvalidRegion->Or(oldShadow, newShadow);
}
}
void
nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
PROFILER_LABEL("nsDisplayBoxShadowInner", "Paint",
js::ProfileEntry::Category::GRAPHICS);
for (uint32_t i = 0; i < rects.Length(); ++i) {
aCtx->ThebesContext()->Save();
aCtx->IntersectClip(rects[i]);
nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame,
borderRect, rects[i]);
aCtx->ThebesContext()->Restore();
}
}
bool
nsDisplayBoxShadowInner::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion)) {
return false;
}
// Store the actual visible region
mVisibleRegion.And(*aVisibleRegion, mVisibleRect);
return true;
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayItem(aBuilder, aFrame)
, mOverrideZIndex(0)
, mHasZIndexOverride(false)
{
MOZ_COUNT_CTOR(nsDisplayWrapList);
mList.AppendToTop(aList);
UpdateBounds(aBuilder);
if (!aFrame || !aFrame->IsTransformed()) {
return;
}
// If the frame is a preserve-3d parent, then we will create transforms
// inside this list afterwards (see WrapPreserve3DList in nsFrame.cpp).
// In this case we will always be outside of the transform, so share
// our parents reference frame.
if (aFrame->Preserves3DChildren()) {
mReferenceFrame =
aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame));
mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame);
} else {
// If we're a transformed frame, then we need to find out if we're inside
// the nsDisplayTransform or outside of it. Frames inside the transform
// need mReferenceFrame == mFrame, outside needs the next ancestor
// reference frame.
// If we're inside the transform, then the nsDisplayItem constructor
// will have done the right thing.
// If we're outside the transform, then we should have only one child
// (since nsDisplayTransform wraps all actual content), and that child
// will have the correct reference frame set (since nsDisplayTransform
// handles this explictly).
//
// Preserve-3d can cause us to have multiple nsDisplayTransform
// children.
nsDisplayItem *i = mList.GetBottom();
if (i && (!i->GetAbove() || i->GetType() == TYPE_TRANSFORM) &&
i->Frame() == mFrame) {
mReferenceFrame = i->ReferenceFrame();
mToReferenceFrame = i->ToReferenceFrame();
}
}
mVisibleRect = aBuilder->GetDirtyRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayItem* aItem)
: nsDisplayItem(aBuilder, aFrame)
, mOverrideZIndex(0)
, mHasZIndexOverride(false)
{
MOZ_COUNT_CTOR(nsDisplayWrapList);
mList.AppendToTop(aItem);
UpdateBounds(aBuilder);
if (!aFrame || !aFrame->IsTransformed()) {
return;
}
if (aFrame->Preserves3DChildren()) {
mReferenceFrame =
aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame));
mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame);
} else {
// See the previous nsDisplayWrapList constructor
if (aItem->Frame() == aFrame) {
mReferenceFrame = aItem->ReferenceFrame();
mToReferenceFrame = aItem->ToReferenceFrame();
}
}
mVisibleRect = aBuilder->GetDirtyRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
}
nsDisplayWrapList::~nsDisplayWrapList() {
mList.DeleteAll();
MOZ_COUNT_DTOR(nsDisplayWrapList);
}
void
nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsRect
nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;
return mBounds;
}
bool
nsDisplayWrapList::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
// Convert the passed in visible region to our appunits.
nsRegion visibleRegion;
// mVisibleRect has been clipped to GetClippedBounds
visibleRegion.And(*aVisibleRegion, mVisibleRect);
nsRegion originalVisibleRegion = visibleRegion;
bool retval =
mList.ComputeVisibilityForSublist(aBuilder, &visibleRegion,
mVisibleRect);
nsRegion removed;
// removed = originalVisibleRegion - visibleRegion
removed.Sub(originalVisibleRegion, visibleRegion);
// aVisibleRegion = aVisibleRegion - removed (modulo any simplifications
// SubtractFromVisibleRegion does)
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
return retval;
}
nsRegion
nsDisplayWrapList::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
*aSnap = false;
nsRegion result;
if (mList.IsOpaque()) {
// Everything within GetBounds that's visible is opaque.
result = GetBounds(aBuilder, aSnap);
}
return result;
}
bool nsDisplayWrapList::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
// We could try to do something but let's conservatively just return false.
return false;
}
void nsDisplayWrapList::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
NS_ERROR("nsDisplayWrapList should have been flattened away for painting");
}
/**
* Returns true if all descendant display items can be placed in the same
* PaintedLayer --- GetLayerState returns LAYER_INACTIVE or LAYER_NONE,
* and they all have the expected animated geometry root.
*/
static LayerState
RequiredLayerStateForChildren(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters,
const nsDisplayList& aList,
nsIFrame* aExpectedAnimatedGeometryRootForChildren)
{
LayerState result = LAYER_INACTIVE;
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
if (result == LAYER_INACTIVE &&
nsLayoutUtils::GetAnimatedGeometryRootFor(i, aBuilder, aManager) !=
aExpectedAnimatedGeometryRootForChildren) {
result = LAYER_ACTIVE;
}
LayerState state = i->GetLayerState(aBuilder, aManager, aParameters);
if ((state == LAYER_ACTIVE || state == LAYER_ACTIVE_FORCE) &&
state > result) {
result = state;
}
if (state == LAYER_ACTIVE_EMPTY && state > result) {
result = LAYER_ACTIVE_FORCE;
}
if (state == LAYER_NONE) {
nsDisplayList* list = i->GetSameCoordinateSystemChildren();
if (list) {
LayerState childState =
RequiredLayerStateForChildren(aBuilder, aManager, aParameters, *list,
aExpectedAnimatedGeometryRootForChildren);
if (childState > result) {
result = childState;
}
}
}
}
return result;
}
nsRect nsDisplayWrapList::GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder)
{
nsRect bounds;
for (nsDisplayItem* i = mList.GetBottom(); i; i = i->GetAbove()) {
bounds.UnionRect(bounds, i->GetComponentAlphaBounds(aBuilder));
}
return bounds;
}
void
nsDisplayWrapList::SetVisibleRect(const nsRect& aRect)
{
mVisibleRect = aRect;
}
static nsresult
WrapDisplayList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayList* aList, nsDisplayWrapper* aWrapper) {
if (!aList->GetTop())
return NS_OK;
nsDisplayItem* item = aWrapper->WrapList(aBuilder, aFrame, aList);
if (!item)
return NS_ERROR_OUT_OF_MEMORY;
// aList was emptied
aList->AppendToTop(item);
return NS_OK;
}
static nsresult
WrapEachDisplayItem(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList, nsDisplayWrapper* aWrapper) {
nsDisplayList newList;
nsDisplayItem* item;
while ((item = aList->RemoveBottom())) {
item = aWrapper->WrapItem(aBuilder, item);
if (!item)
return NS_ERROR_OUT_OF_MEMORY;
newList.AppendToTop(item);
}
// aList was emptied
aList->AppendToTop(&newList);
return NS_OK;
}
nsresult nsDisplayWrapper::WrapLists(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsDisplayListSet& aIn, const nsDisplayListSet& aOut)
{
nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn);
NS_ENSURE_SUCCESS(rv, rv);
if (&aOut == &aIn)
return NS_OK;
aOut.BorderBackground()->AppendToTop(aIn.BorderBackground());
aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds());
aOut.Floats()->AppendToTop(aIn.Floats());
aOut.Content()->AppendToTop(aIn.Content());
aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants());
aOut.Outlines()->AppendToTop(aIn.Outlines());
return NS_OK;
}
nsresult nsDisplayWrapper::WrapListsInPlace(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, const nsDisplayListSet& aLists)
{
nsresult rv;
if (WrapBorderBackground()) {
// Our border-backgrounds are in-flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.BorderBackground(), this);
NS_ENSURE_SUCCESS(rv, rv);
}
// Our block border-backgrounds are in-flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.BlockBorderBackgrounds(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The floats are not in flow
rv = WrapEachDisplayItem(aBuilder, aLists.Floats(), this);
NS_ENSURE_SUCCESS(rv, rv);
// Our child content is in flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.Content(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The positioned descendants may not be in-flow
rv = WrapEachDisplayItem(aBuilder, aLists.PositionedDescendants(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The outlines may not be in-flow
return WrapEachDisplayItem(aBuilder, aLists.Outlines(), this);
}
nsDisplayOpacity::nsDisplayOpacity(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mOpacity(aFrame->StyleDisplay()->mOpacity) {
MOZ_COUNT_CTOR(nsDisplayOpacity);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayOpacity::~nsDisplayOpacity() {
MOZ_COUNT_DTOR(nsDisplayOpacity);
}
#endif
nsRegion nsDisplayOpacity::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
*aSnap = false;
// The only time where mOpacity == 1.0 should be when we have will-change.
// We could report this as opaque then but when the will-change value starts
// animating the element would become non opaque and could cause repaints.
return nsRegion();
}
// nsDisplayOpacity uses layers for rendering
already_AddRefed<Layer>
nsDisplayOpacity::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
if (mOpacity == 0 && mFrame->GetContent() &&
!nsLayoutUtils::HasAnimations(mFrame->GetContent(), eCSSProperty_opacity)) {
return nullptr;
}
nsRefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
aContainerParameters, nullptr);
if (!container)
return nullptr;
container->SetOpacity(mOpacity);
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, mFrame,
eCSSProperty_opacity);
return container.forget();
}
/**
* This doesn't take into account layer scaling --- the layer may be
* rendered at a higher (or lower) resolution, affecting the retained layer
* size --- but this should be good enough.
*/
static bool
IsItemTooSmallForActiveLayer(nsDisplayItem* aItem)
{
nsIntRect visibleDevPixels = aItem->GetVisibleRect().ToOutsidePixels(
aItem->Frame()->PresContext()->AppUnitsPerDevPixel());
static const int MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS = 16;
return visibleDevPixels.Size() <
nsIntSize(MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS, MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS);
}
bool
nsDisplayOpacity::NeedsActiveLayer()
{
if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_opacity) &&
!IsItemTooSmallForActiveLayer(this))
return true;
if (mFrame->GetContent()) {
if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(),
eCSSProperty_opacity)) {
return true;
}
}
return false;
}
bool
nsDisplayOpacity::ApplyOpacity(nsDisplayListBuilder* aBuilder,
float aOpacity,
const DisplayItemClip* aClip)
{
mOpacity = mOpacity * aOpacity;
if (aClip) {
IntersectClip(aBuilder, *aClip);
}
return true;
}
bool
nsDisplayOpacity::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
if (NeedsActiveLayer())
return false;
nsDisplayItem* child = mList.GetBottom();
// Only try folding our opacity down if we have a single
// child. We could potentially do this also if we had multiple
// children as long as they don't overlap.
if (!child || child->GetAbove()) {
return false;
}
return child->ApplyOpacity(aBuilder, mOpacity, mClip);
}
nsDisplayItem::LayerState
nsDisplayOpacity::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) {
if (NeedsActiveLayer())
return LAYER_ACTIVE;
return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, mList,
nsLayoutUtils::GetAnimatedGeometryRootFor(this, aBuilder, aManager));
}
bool
nsDisplayOpacity::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
// Our children are translucent so we should not allow them to subtract
// area from aVisibleRegion. We do need to find out what is visible under
// our children in the temporary compositing buffer, because if our children
// paint our entire bounds opaquely then we don't need an alpha channel in
// the temporary compositing buffer.
nsRect bounds = GetClippedBounds(aBuilder);
nsRegion visibleUnderChildren;
visibleUnderChildren.And(*aVisibleRegion, bounds);
return
nsDisplayWrapList::ComputeVisibility(aBuilder, &visibleUnderChildren);
}
bool nsDisplayOpacity::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_OPACITY)
return false;
// items for the same content element should be merged into a single
// compositing group
// aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity
if (aItem->Frame()->GetContent() != mFrame->GetContent())
return false;
if (aItem->GetClip() != GetClip())
return false;
MergeFromTrackingMergedFrames(static_cast<nsDisplayOpacity*>(aItem));
return true;
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayOpacity::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (opacity %f)", mOpacity);
}
#endif
nsDisplayMixBlendMode::nsDisplayMixBlendMode(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayMixBlendMode);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayMixBlendMode::~nsDisplayMixBlendMode() {
MOZ_COUNT_DTOR(nsDisplayMixBlendMode);
}
#endif
nsRegion nsDisplayMixBlendMode::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
*aSnap = false;
// We are never considered opaque
return nsRegion();
}
LayerState
nsDisplayMixBlendMode::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
gfxContext::GraphicsOperator op = nsCSSRendering::GetGFXBlendMode(mFrame->StyleDisplay()->mMixBlendMode);
if (aManager->SupportsMixBlendMode(gfx::CompositionOpForOp(op))) {
return LAYER_ACTIVE;
}
return LAYER_INACTIVE;
}
// nsDisplayMixBlendMode uses layers for rendering
already_AddRefed<Layer>
nsDisplayMixBlendMode::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
ContainerLayerParameters newContainerParameters = aContainerParameters;
newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true;
nsRefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr);
if (!container) {
return nullptr;
}
container->DeprecatedSetMixBlendMode(nsCSSRendering::GetGFXBlendMode(mFrame->StyleDisplay()->mMixBlendMode));
return container.forget();
}
bool nsDisplayMixBlendMode::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
// Our children are need their backdrop so we should not allow them to subtract
// area from aVisibleRegion. We do need to find out what is visible under
// our children in the temporary compositing buffer, because if our children
// paint our entire bounds opaquely then we don't need an alpha channel in
// the temporary compositing buffer.
nsRect bounds = GetClippedBounds(aBuilder);
nsRegion visibleUnderChildren;
visibleUnderChildren.And(*aVisibleRegion, bounds);
return nsDisplayWrapList::ComputeVisibility(aBuilder, &visibleUnderChildren);
}
bool nsDisplayMixBlendMode::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_MIX_BLEND_MODE)
return false;
// items for the same content element should be merged into a single
// compositing group
// aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity
if (aItem->Frame()->GetContent() != mFrame->GetContent())
return false;
if (aItem->GetClip() != GetClip())
return false;
MergeFromTrackingMergedFrames(static_cast<nsDisplayMixBlendMode*>(aItem));
return true;
}
nsDisplayBlendContainer::nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
BlendModeSet& aContainedBlendModes)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mContainedBlendModes(aContainedBlendModes)
, mCanBeActive(true)
{
MOZ_COUNT_CTOR(nsDisplayBlendContainer);
}
nsDisplayBlendContainer::nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mCanBeActive(false)
{
MOZ_COUNT_CTOR(nsDisplayBlendContainer);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayBlendContainer::~nsDisplayBlendContainer() {
MOZ_COUNT_DTOR(nsDisplayBlendContainer);
}
#endif
// nsDisplayBlendContainer uses layers for rendering
already_AddRefed<Layer>
nsDisplayBlendContainer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
// turn off anti-aliasing in the parent stacking context because it changes
// how the group is initialized.
ContainerLayerParameters newContainerParameters = aContainerParameters;
newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true;
nsRefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr);
if (!container) {
return nullptr;
}
container->SetForceIsolatedGroup(true);
return container.forget();
}
bool nsDisplayBlendContainer::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_BLEND_CONTAINER)
return false;
// items for the same content element should be merged into a single
// compositing group
// aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity
if (aItem->Frame()->GetContent() != mFrame->GetContent())
return false;
if (aItem->GetClip() != GetClip())
return false;
MergeFromTrackingMergedFrames(static_cast<nsDisplayBlendContainer*>(aItem));
return true;
}
nsDisplayOwnLayer::nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags, ViewID aScrollTarget)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mFlags(aFlags)
, mScrollTarget(aScrollTarget) {
MOZ_COUNT_CTOR(nsDisplayOwnLayer);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayOwnLayer::~nsDisplayOwnLayer() {
MOZ_COUNT_DTOR(nsDisplayOwnLayer);
}
#endif
// nsDisplayOpacity uses layers for rendering
already_AddRefed<Layer>
nsDisplayOwnLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
nsRefPtr<ContainerLayer> layer = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
aContainerParameters, nullptr);
if (mFlags & VERTICAL_SCROLLBAR) {
layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::VERTICAL);
}
if (mFlags & HORIZONTAL_SCROLLBAR) {
layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::HORIZONTAL);
}
if (mFlags & GENERATE_SUBDOC_INVALIDATIONS) {
mFrame->PresContext()->SetNotifySubDocInvalidationData(layer);
}
return layer.forget();
}
nsDisplaySubDocument::nsDisplaySubDocument(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags)
: nsDisplayOwnLayer(aBuilder, aFrame, aList, aFlags)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
{
MOZ_COUNT_CTOR(nsDisplaySubDocument);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplaySubDocument::~nsDisplaySubDocument() {
MOZ_COUNT_DTOR(nsDisplaySubDocument);
}
#endif
already_AddRefed<Layer>
nsDisplaySubDocument::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
nsPresContext* presContext = mFrame->PresContext();
nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
ContainerLayerParameters params = aContainerParameters;
if ((mFlags & GENERATE_SCROLLABLE_LAYER) &&
rootScrollFrame->GetContent() &&
nsLayoutUtils::GetCriticalDisplayPort(rootScrollFrame->GetContent(), nullptr)) {
params.mInLowPrecisionDisplayPort = true;
}
return nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, params);
}
UniquePtr<FrameMetrics>
nsDisplaySubDocument::ComputeFrameMetrics(Layer* aLayer,
const ContainerLayerParameters& aContainerParameters)
{
if (!(mFlags & GENERATE_SCROLLABLE_LAYER)) {
return UniquePtr<FrameMetrics>(nullptr);
}
nsPresContext* presContext = mFrame->PresContext();
nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
bool isRootContentDocument = presContext->IsRootContentDocument();
ContainerLayerParameters params = aContainerParameters;
if ((mFlags & GENERATE_SCROLLABLE_LAYER) &&
rootScrollFrame->GetContent() &&
nsLayoutUtils::GetCriticalDisplayPort(rootScrollFrame->GetContent(), nullptr)) {
params.mInLowPrecisionDisplayPort = true;
}
nsRect viewport = mFrame->GetRect() -
mFrame->GetPosition() +
mFrame->GetOffsetToCrossDoc(ReferenceFrame());
return MakeUnique<FrameMetrics>(
nsDisplayScrollLayer::ComputeFrameMetrics(mFrame, rootScrollFrame, ReferenceFrame(),
aLayer, mScrollParentId, viewport,
false, isRootContentDocument, params));
}
nsRect
nsDisplaySubDocument::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
bool usingDisplayPort =
nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext());
if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) {
*aSnap = false;
return mFrame->GetRect() + aBuilder->ToReferenceFrame(mFrame);
}
return nsDisplayOwnLayer::GetBounds(aBuilder, aSnap);
}
bool
nsDisplaySubDocument::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion)
{
nsRect displayport;
bool usingDisplayPort =
nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext(), &displayport);
if (!(mFlags & GENERATE_SCROLLABLE_LAYER) || !usingDisplayPort) {
return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion);
}
nsRegion childVisibleRegion;
// The visible region for the children may be much bigger than the hole we
// are viewing the children from, so that the compositor process has enough
// content to asynchronously pan while content is being refreshed.
childVisibleRegion = displayport + mFrame->GetOffsetToCrossDoc(ReferenceFrame());
nsRect boundedRect =
childVisibleRegion.GetBounds().Intersect(mList.GetBounds(aBuilder));
bool visible = mList.ComputeVisibilityForSublist(
aBuilder, &childVisibleRegion, boundedRect,
usingDisplayPort ? mFrame : nullptr);
// If APZ is enabled then don't allow this computation to influence
// aVisibleRegion, on the assumption that the layer can be asynchronously
// scrolled so we'll definitely need all the content under it.
if (!nsLayoutUtils::UsesAsyncScrolling()) {
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRegion removed;
removed.Sub(bounds, childVisibleRegion);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
}
return visible;
}
bool
nsDisplaySubDocument::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
bool usingDisplayPort =
nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext());
if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) {
return true;
}
return nsDisplayOwnLayer::ShouldBuildLayerEvenIfInvisible(aBuilder);
}
nsRegion
nsDisplaySubDocument::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
bool usingDisplayPort =
nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext());
if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) {
*aSnap = false;
return nsRegion();
}
return nsDisplayOwnLayer::GetOpaqueRegion(aBuilder, aSnap);
}
nsDisplayResolution::nsDisplayResolution(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags)
: nsDisplaySubDocument(aBuilder, aFrame, aList, aFlags) {
MOZ_COUNT_CTOR(nsDisplayResolution);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayResolution::~nsDisplayResolution() {
MOZ_COUNT_DTOR(nsDisplayResolution);
}
#endif
already_AddRefed<Layer>
nsDisplayResolution::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
nsIPresShell* presShell = mFrame->PresContext()->PresShell();
ContainerLayerParameters containerParameters(
presShell->GetXResolution(), presShell->GetYResolution(), nsIntPoint(),
aContainerParameters);
nsRefPtr<Layer> layer = nsDisplaySubDocument::BuildLayer(
aBuilder, aManager, containerParameters);
layer->SetPostScale(1.0f / presShell->GetXResolution(),
1.0f / presShell->GetYResolution());
return layer.forget();
}
nsDisplayStickyPosition::nsDisplayStickyPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: nsDisplayOwnLayer(aBuilder, aFrame, aList)
{
MOZ_COUNT_CTOR(nsDisplayStickyPosition);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayStickyPosition::~nsDisplayStickyPosition() {
MOZ_COUNT_DTOR(nsDisplayStickyPosition);
}
#endif
already_AddRefed<Layer>
nsDisplayStickyPosition::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
nsRefPtr<Layer> layer =
nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, aContainerParameters);
StickyScrollContainer* stickyScrollContainer = StickyScrollContainer::
GetStickyScrollContainerForFrame(mFrame);
if (!stickyScrollContainer) {
return layer.forget();
}
nsIFrame* scrollFrame = do_QueryFrame(stickyScrollContainer->ScrollFrame());
nsPresContext* presContext = scrollFrame->PresContext();
// Sticky position frames whose scroll frame is the root scroll frame are
// reflowed into the scroll-port size if one has been set.
nsSize scrollFrameSize = scrollFrame->GetSize();
if (scrollFrame == presContext->PresShell()->GetRootScrollFrame() &&
presContext->PresShell()->IsScrollPositionClampingScrollPortSizeSet()) {
scrollFrameSize = presContext->PresShell()->
GetScrollPositionClampingScrollPortSize();
}
nsLayoutUtils::SetFixedPositionLayerData(layer, scrollFrame,
nsRect(scrollFrame->GetOffsetToCrossDoc(ReferenceFrame()), scrollFrameSize),
mFrame, presContext, aContainerParameters);
ViewID scrollId = nsLayoutUtils::FindOrCreateIDFor(
stickyScrollContainer->ScrollFrame()->GetScrolledFrame()->GetContent());
float factor = presContext->AppUnitsPerDevPixel();
nsRect outer;
nsRect inner;
stickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner);
LayerRect stickyOuter(NSAppUnitsToFloatPixels(outer.x, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(outer.y, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(outer.width, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(outer.height, factor) *
aContainerParameters.mYScale);
LayerRect stickyInner(NSAppUnitsToFloatPixels(inner.x, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(inner.y, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(inner.width, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(inner.height, factor) *
aContainerParameters.mYScale);
layer->SetStickyPositionData(scrollId, stickyOuter, stickyInner);
return layer.forget();
}
bool nsDisplayStickyPosition::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_STICKY_POSITION)
return false;
// Items with the same fixed position frame can be merged.
nsDisplayStickyPosition* other = static_cast<nsDisplayStickyPosition*>(aItem);
if (other->mFrame != mFrame)
return false;
if (aItem->GetClip() != GetClip())
return false;
MergeFromTrackingMergedFrames(other);
return true;
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame, aList)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame, aItem)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aForFrame,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aForFrame)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
, mDisplayPortContentsOpaque(false)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollLayer);
#endif
NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(),
"Need a child frame with content");
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayScrollLayer::~nsDisplayScrollLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollLayer);
}
#endif
nsRect
nsDisplayScrollLayer::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
nsIScrollableFrame* sf = do_QueryFrame(mScrollFrame);
if (sf) {
*aSnap = false;
return sf->GetScrollPortRect() + aBuilder->ToReferenceFrame(mScrollFrame);
}
return nsDisplayWrapList::GetBounds(aBuilder, aSnap);
}
nsRect
nsDisplayScrollLayer::GetScrolledContentRectToDraw(nsDisplayListBuilder* aBuilder,
nsRect* aDisplayPort)
{
if (aDisplayPort) {
// The visible region for the children may be much bigger than the hole we
// are viewing the children from, so that the compositor process has enough
// content to asynchronously pan while content is being refreshed.
// XXX mScrollFrame seems wrong here; we should add the offset of the
// scrollport
return *aDisplayPort + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
}
bool snap;
return GetBounds(aBuilder, &snap);
}
already_AddRefed<Layer>
nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
ContainerLayerParameters params = aContainerParameters;
if (mScrolledFrame->GetContent() &&
nsLayoutUtils::GetCriticalDisplayPort(mScrolledFrame->GetContent(), nullptr)) {
params.mInLowPrecisionDisplayPort = true;
}
if (mList.IsOpaque()) {
nsRect displayport;
bool usingDisplayport =
nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport);
mDisplayPortContentsOpaque = mList.GetBounds(aBuilder).Contains(
GetScrolledContentRectToDraw(aBuilder, usingDisplayport ? &displayport : nullptr));
} else {
mDisplayPortContentsOpaque = false;
}
return aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
params, nullptr);
}
UniquePtr<FrameMetrics>
nsDisplayScrollLayer::ComputeFrameMetrics(Layer* aLayer,
const ContainerLayerParameters& aContainerParameters)
{
ContainerLayerParameters params = aContainerParameters;
if (mScrolledFrame->GetContent() &&
nsLayoutUtils::GetCriticalDisplayPort(mScrolledFrame->GetContent(), nullptr)) {
params.mInLowPrecisionDisplayPort = true;
}
nsRect viewport = mScrollFrame->GetRect() -
mScrollFrame->GetPosition() +
mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
return UniquePtr<FrameMetrics>(new FrameMetrics(
ComputeFrameMetrics(mScrolledFrame, mScrollFrame, ReferenceFrame(), aLayer,
mScrollParentId, viewport, false, false, params)));
}
bool
nsDisplayScrollLayer::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
if (nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), nullptr)) {
return true;
}
return nsDisplayWrapList::ShouldBuildLayerEvenIfInvisible(aBuilder);
}
bool
nsDisplayScrollLayer::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion)
{
if (aBuilder->IsForPluginGeometry()) {
return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion);
}
nsRect displayport;
bool usingDisplayPort =
nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport);
nsRect scrolledContentRect = GetScrolledContentRectToDraw(aBuilder,
usingDisplayPort ? &displayport : nullptr);
nsRect boundedRect = scrolledContentRect.Intersect(mList.GetBounds(aBuilder));
nsRegion childVisibleRegion = scrolledContentRect;
bool visible = mList.ComputeVisibilityForSublist(
aBuilder, &childVisibleRegion, boundedRect,
usingDisplayPort ? mScrollFrame : nullptr);
// If APZ is enabled then don't allow this computation to influence
// aVisibleRegion, on the assumption that the layer can be asynchronously
// scrolled so we'll definitely need all the content under it.
if (!nsLayoutUtils::UsesAsyncScrolling()) {
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRegion removed;
removed.Sub(bounds, childVisibleRegion);
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
}
return visible;
}
LayerState
nsDisplayScrollLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
// Force this as a layer so we can scroll asynchronously.
// This causes incorrect rendering for rounded clips!
return LAYER_ACTIVE_FORCE;
}
// Check if we are going to clip an abs pos item that we don't contain.
// Root scroll frames clip all their descendants, so we don't need to worry
// about them.
bool
WouldCauseIncorrectClippingOnAbsPosItem(nsDisplayListBuilder* aBuilder,
nsDisplayScrollLayer* aItem)
{
nsIFrame* scrollFrame = aItem->GetScrollFrame();
nsIPresShell* presShell = scrollFrame->PresContext()->PresShell();
if (scrollFrame == presShell->GetRootScrollFrame()) {
return false;
}
nsIFrame* scrolledFrame = aItem->GetScrolledFrame();
nsIFrame* frame = aItem->Frame();
if (frame == scrolledFrame || !frame->IsAbsolutelyPositioned() ||
nsLayoutUtils::IsAncestorFrameCrossDoc(scrollFrame, frame, presShell->GetRootFrame())) {
return false;
}
if (!aItem->GetClip().IsRectAffectedByClip(aItem->GetChildren()->GetBounds(aBuilder))) {
return false;
}
return true;
}
bool
nsDisplayScrollLayer::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
if (aItem->GetType() != TYPE_SCROLL_LAYER) {
return false;
}
nsDisplayScrollLayer* other = static_cast<nsDisplayScrollLayer*>(aItem);
if (other->mScrolledFrame != this->mScrolledFrame) {
return false;
}
if (aItem->GetClip() != GetClip()) {
return false;
}
if (WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, this) ||
WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, other)) {
return false;
}
NS_ASSERTION(other->mReferenceFrame == mReferenceFrame,
"Must have the same reference frame!");
FrameProperties props = mScrolledFrame->Properties();
props.Set(nsIFrame::ScrollLayerCount(),
reinterpret_cast<void*>(GetScrollLayerCount() - 1));
// Swap frames with the other item before doing MergeFrom.
// XXX - This ensures that the frame associated with a scroll layer after
// merging is the first, rather than the last. This tends to change less,
// ensuring we're more likely to retain the associated gfx layer.
// See Bug 729534 and Bug 731641.
nsIFrame* tmp = mFrame;
mFrame = other->mFrame;
other->mFrame = tmp;
MergeFromTrackingMergedFrames(other);
return true;
}
void
PropagateClip(nsDisplayListBuilder* aBuilder, const DisplayItemClip& aClip,
nsDisplayList* aList)
{
for (nsDisplayItem* i = aList->GetBottom(); i != nullptr; i = i->GetAbove()) {
DisplayItemClip clip(i->GetClip());
clip.IntersectWith(aClip);
i->SetClip(aBuilder, clip);
nsDisplayList* list = i->GetSameCoordinateSystemChildren();
if (list) {
PropagateClip(aBuilder, aClip, list);
}
}
}
bool
nsDisplayScrollLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
bool badAbsPosClip = WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, this);
if (GetScrollLayerCount() > 1 || badAbsPosClip) {
// Propagate our clip to our children. The clip for the scroll frame is
// on this item, but not our child items so that they can draw non-visible
// parts of the display port. But if we are flattening we failed and can't
// draw the extra content, so it needs to be clipped.
// But don't induce our clip on abs pos frames that we shouldn't be clipping.
if (!badAbsPosClip) {
PropagateClip(aBuilder, GetClip(), &mList);
}
// Output something so the failure can be noted.
nsresult status;
mScrolledFrame->GetContent()->GetProperty(nsGkAtoms::AsyncScrollLayerCreationFailed, &status);
if (status == NS_PROPTABLE_PROP_NOT_THERE) {
mScrolledFrame->GetContent()->SetProperty(nsGkAtoms::AsyncScrollLayerCreationFailed, nullptr);
if (badAbsPosClip) {
printf_stderr("Async scrollable layer creation failed: scroll layer would induce incorrent clipping to an abs pos item.\n");
} else {
printf_stderr("Async scrollable layer creation failed: scroll layer can't have scrollable and non-scrollable items interleaved.\n");
}
#ifdef MOZ_DUMP_PAINTING
std::stringstream ss;
nsFrame::PrintDisplayItem(aBuilder, this, ss, true, false);
printf_stderr("%s\n", ss.str().c_str());
#endif
}
return true;
}
if (mFrame != mScrolledFrame) {
mMergedFrames.AppendElement(mFrame);
mFrame = mScrolledFrame;
}
return false;
}
intptr_t
nsDisplayScrollLayer::GetScrollLayerCount()
{
FrameProperties props = mScrolledFrame->Properties();
#ifdef DEBUG
bool hasCount = false;
intptr_t result = reinterpret_cast<intptr_t>(
props.Get(nsIFrame::ScrollLayerCount(), &hasCount));
// If this aborts, then the property was either not added before scroll
// layers were created or the property was deleted to early. If the latter,
// make sure that nsDisplayScrollInfoLayer is on the bottom of the list so
// that it is processed last.
NS_ABORT_IF_FALSE(hasCount, "nsDisplayScrollLayer should always be defined");
return result;
#else
return reinterpret_cast<intptr_t>(props.Get(nsIFrame::ScrollLayerCount()));
#endif
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayScrollLayer::WriteDebugInfo(nsACString& aTo)
{
aTo += nsPrintfCString(" (scrollframe %p scrolledframe %p)",
mScrollFrame, mScrolledFrame);
}
#endif
nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
nsDisplayListBuilder* aBuilder,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayScrollLayer(aBuilder, aScrollFrame, aScrolledFrame, aScrollFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
#endif
}
nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer);
}
nsRect
nsDisplayScrollInfoLayer::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
return nsDisplayWrapList::GetBounds(aBuilder, aSnap);
}
LayerState
nsDisplayScrollInfoLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return LAYER_ACTIVE_EMPTY;
}
bool
nsDisplayScrollInfoLayer::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
return false;
}
bool
nsDisplayScrollInfoLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
// Layer metadata for a particular scroll frame needs to be unique. Only
// one nsDisplayScrollLayer (with rendered content) or one
// nsDisplayScrollInfoLayer (with only the metadata) should survive the
// visibility computation.
return GetScrollLayerCount() == 1;
}
nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
int32_t aAPD, int32_t aParentAPD,
uint32_t aFlags)
: nsDisplaySubDocument(aBuilder, aFrame, aList, aFlags)
, mAPD(aAPD), mParentAPD(aParentAPD) {
MOZ_COUNT_CTOR(nsDisplayZoom);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayZoom::~nsDisplayZoom() {
MOZ_COUNT_DTOR(nsDisplayZoom);
}
#endif
nsRect nsDisplayZoom::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
nsRect bounds = nsDisplaySubDocument::GetBounds(aBuilder, aSnap);
*aSnap = false;
return bounds.ConvertAppUnitsRoundOut(mAPD, mParentAPD);
}
void nsDisplayZoom::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
nsRect rect;
// A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1
// rect as well instead of possibly rounding the width or height to zero.
if (aRect.width == 1 && aRect.height == 1) {
rect.MoveTo(aRect.TopLeft().ConvertAppUnits(mParentAPD, mAPD));
rect.width = rect.height = 1;
} else {
rect = aRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
}
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
void nsDisplayZoom::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
mList.PaintForFrame(aBuilder, aCtx, mFrame, nsDisplayList::PAINT_DEFAULT);
}
bool nsDisplayZoom::ComputeVisibility(nsDisplayListBuilder *aBuilder,
nsRegion *aVisibleRegion)
{
// Convert the passed in visible region to our appunits.
nsRegion visibleRegion;
// mVisibleRect has been clipped to GetClippedBounds
visibleRegion.And(*aVisibleRegion, mVisibleRect);
visibleRegion = visibleRegion.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
nsRegion originalVisibleRegion = visibleRegion;
nsRect transformedVisibleRect =
mVisibleRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
bool retval;
// If we are to generate a scrollable layer we call
// nsDisplaySubDocument::ComputeVisibility to make the necessary adjustments
// for ComputeVisibility, it does all it's calculations in the child APD.
bool usingDisplayPort =
nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext());
if (!(mFlags & GENERATE_SCROLLABLE_LAYER) || !usingDisplayPort) {
retval =
mList.ComputeVisibilityForSublist(aBuilder, &visibleRegion,
transformedVisibleRect);
} else {
retval =
nsDisplaySubDocument::ComputeVisibility(aBuilder, &visibleRegion);
}
nsRegion removed;
// removed = originalVisibleRegion - visibleRegion
removed.Sub(originalVisibleRegion, visibleRegion);
// Convert removed region to parent appunits.
removed = removed.ConvertAppUnitsRoundIn(mAPD, mParentAPD);
// aVisibleRegion = aVisibleRegion - removed (modulo any simplifications
// SubtractFromVisibleRegion does)
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
return retval;
}
///////////////////////////////////////////////////
// nsDisplayTransform Implementation
//
// Write #define UNIFIED_CONTINUATIONS here to have the transform property try
// to transform content with continuations as one unified block instead of
// several smaller ones. This is currently disabled because it doesn't work
// correctly, since when the frames are initially being reflowed, their
// continuations all compute their bounding rects independently of each other
// and consequently get the wrong value. Write #define DEBUG_HIT here to have
// the nsDisplayTransform class dump out a bunch of information about hit
// detection.
#undef UNIFIED_CONTINUATIONS
#undef DEBUG_HIT
/* Returns the bounds of a frame as defined for transforms. If
* UNIFIED_CONTINUATIONS is not defined, this is simply the frame's bounding
* rectangle, translated to the origin. Otherwise, returns the smallest
* rectangle containing a frame and all of its continuations. For example, if
* there is a <span> element with several continuations split over several
* lines, this function will return the rectangle containing all of those
* continuations. This rectangle is relative to the origin of the frame's local
* coordinate space.
*/
#ifndef UNIFIED_CONTINUATIONS
nsRect
nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!");
if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
// TODO: SVG needs to define what percentage translations resolve against.
return nsRect();
}
return nsRect(nsPoint(0, 0), aFrame->GetSize());
}
#else
nsRect
nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!");
nsRect result;
if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
// TODO: SVG needs to define what percentage translations resolve against.
return result;
}
/* Iterate through the continuation list, unioning together all the
* bounding rects.
*/
for (const nsIFrame *currFrame = aFrame->FirstContinuation();
currFrame != nullptr;
currFrame = currFrame->GetNextContinuation())
{
/* Get the frame rect in local coordinates, then translate back to the
* original coordinates.
*/
result.UnionRect(result, nsRect(currFrame->GetOffsetTo(aFrame),
currFrame->GetSize()));
}
return result;
}
#endif
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame *aFrame, nsDisplayList *aList,
const nsRect& aChildrenVisibleRect,
ComputeTransformFunction aTransformGetter,
uint32_t aIndex)
: nsDisplayItem(aBuilder, aFrame)
, mStoredList(aBuilder, aFrame, aList)
, mTransformGetter(aTransformGetter)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
NS_ABORT_IF_FALSE(!aFrame->IsTransformed(), "Can't specify a transform getter for a transformed frame!");
Init(aBuilder);
}
void
nsDisplayTransform::SetReferenceFrameToAncestor(nsDisplayListBuilder* aBuilder)
{
mReferenceFrame =
aBuilder->FindReferenceFrameFor(GetTransformRootFrame(mFrame));
mToReferenceFrame = mFrame->GetOffsetToCrossDoc(mReferenceFrame);
mVisibleRect = aBuilder->GetDirtyRect() + mToReferenceFrame;
}
void
nsDisplayTransform::Init(nsDisplayListBuilder* aBuilder)
{
mStoredList.SetClip(aBuilder, DisplayItemClip::NoClip());
mStoredList.SetVisibleRect(mChildrenVisibleRect);
mPrerender = ShouldPrerenderTransformedContent(aBuilder, mFrame);
if (mPrerender) {
bool snap;
mVisibleRect = GetBounds(aBuilder, &snap);
}
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame *aFrame, nsDisplayList *aList,
const nsRect& aChildrenVisibleRect,
uint32_t aIndex)
: nsDisplayItem(aBuilder, aFrame)
, mStoredList(aBuilder, aFrame, aList)
, mTransformGetter(nullptr)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
SetReferenceFrameToAncestor(aBuilder);
Init(aBuilder);
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame *aFrame, nsDisplayItem *aItem,
const nsRect& aChildrenVisibleRect,
uint32_t aIndex)
: nsDisplayItem(aBuilder, aFrame)
, mStoredList(aBuilder, aFrame, aItem)
, mTransformGetter(nullptr)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
NS_ABORT_IF_FALSE(aFrame, "Must have a frame!");
SetReferenceFrameToAncestor(aBuilder);
Init(aBuilder);
}
/* Returns the delta specified by the -moz-transform-origin property.
* This is a positive delta, meaning that it indicates the direction to move
* to get from (0, 0) of the frame to the transform origin. This function is
* called off the main thread.
*/
/* static */ Point3D
nsDisplayTransform::GetDeltaToTransformOrigin(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride)
{
NS_PRECONDITION(aFrame, "Can't get delta for a null frame!");
NS_PRECONDITION(aFrame->IsTransformed() || aFrame->StyleDisplay()->BackfaceIsHidden(),
"Shouldn't get a delta for an untransformed frame!");
if (!aFrame->IsTransformed()) {
return Point3D();
}
/* For both of the coordinates, if the value of -moz-transform is a
* percentage, it's relative to the size of the frame. Otherwise, if it's
* a distance, it's already computed for us!
*/
const nsStyleDisplay* display = aFrame->StyleDisplay();
nsRect boundingRect = (aBoundsOverride ? *aBoundsOverride :
nsDisplayTransform::GetFrameBoundsForTransform(aFrame));
/* Allows us to access named variables by index. */
float coords[3];
const nscoord* dimensions[2] =
{&boundingRect.width, &boundingRect.height};
for (uint8_t index = 0; index < 2; ++index) {
/* If the -moz-transform-origin specifies a percentage, take the percentage
* of the size of the box.
*/
const nsStyleCoord &coord = display->mTransformOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
coord.GetPercentValue();
} else {
NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
coords[index] =
NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel);
}
if ((aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) &&
coord.GetUnit() != eStyleUnit_Percent) {
// <length> values represent offsets from the origin of the SVG element's
// user space, not the top left of its bounds, so we must adjust for that:
nscoord offset =
(index == 0) ? aFrame->GetPosition().x : aFrame->GetPosition().y;
coords[index] -= NSAppUnitsToFloatPixels(offset, aAppUnitsPerPixel);
}
}
coords[2] = NSAppUnitsToFloatPixels(display->mTransformOrigin[2].GetCoordValue(),
aAppUnitsPerPixel);
/* Adjust based on the origin of the rectangle. */
coords[0] += NSAppUnitsToFloatPixels(boundingRect.x, aAppUnitsPerPixel);
coords[1] += NSAppUnitsToFloatPixels(boundingRect.y, aAppUnitsPerPixel);
return Point3D(coords[0], coords[1], coords[2]);
}
/* Returns the delta specified by the -moz-perspective-origin property.
* This is a positive delta, meaning that it indicates the direction to move
* to get from (0, 0) of the frame to the perspective origin. This function is
* called off the main thread.
*/
/* static */ Point3D
nsDisplayTransform::GetDeltaToPerspectiveOrigin(const nsIFrame* aFrame,
float aAppUnitsPerPixel)
{
NS_PRECONDITION(aFrame, "Can't get delta for a null frame!");
NS_PRECONDITION(aFrame->IsTransformed() || aFrame->StyleDisplay()->BackfaceIsHidden(),
"Shouldn't get a delta for an untransformed frame!");
if (!aFrame->IsTransformed()) {
return Point3D();
}
/* For both of the coordinates, if the value of -moz-perspective-origin is a
* percentage, it's relative to the size of the frame. Otherwise, if it's
* a distance, it's already computed for us!
*/
//TODO: Should this be using our bounds or the parent's bounds?
// How do we handle aBoundsOverride in the latter case?
nsIFrame* parent = aFrame->GetParentStyleContextFrame();
if (!parent) {
return Point3D();
}
const nsStyleDisplay* display = parent->StyleDisplay();
nsRect boundingRect = nsDisplayTransform::GetFrameBoundsForTransform(parent);
/* Allows us to access named variables by index. */
Point3D result;
result.z = 0.0f;
gfx::Float* coords[2] = {&result.x, &result.y};
const nscoord* dimensions[2] =
{&boundingRect.width, &boundingRect.height};
for (uint8_t index = 0; index < 2; ++index) {
/* If the -moz-transform-origin specifies a percentage, take the percentage
* of the size of the box.
*/
const nsStyleCoord &coord = display->mPerspectiveOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
*coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
*coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
coord.GetPercentValue();
} else {
NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
*coords[index] =
NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel);
}
}
nsPoint parentOffset = aFrame->GetOffsetTo(parent);
Point3D gfxOffset(
NSAppUnitsToFloatPixels(parentOffset.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(parentOffset.y, aAppUnitsPerPixel),
0.0f);
return result - gfxOffset;
}
nsDisplayTransform::FrameTransformProperties::FrameTransformProperties(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride)
: mFrame(aFrame)
, mTransformList(aFrame->StyleDisplay()->mSpecifiedTransform)
, mToTransformOrigin(GetDeltaToTransformOrigin(aFrame, aAppUnitsPerPixel, aBoundsOverride))
, mToPerspectiveOrigin(GetDeltaToPerspectiveOrigin(aFrame, aAppUnitsPerPixel))
, mChildPerspective(0)
{
const nsStyleDisplay* parentDisp = nullptr;
nsStyleContext* parentStyleContext = aFrame->StyleContext()->GetParent();
if (parentStyleContext) {
parentDisp = parentStyleContext->StyleDisplay();
}
if (parentDisp && parentDisp->mChildPerspective.GetUnit() == eStyleUnit_Coord) {
mChildPerspective = parentDisp->mChildPerspective.GetCoordValue();
}
}
/* Wraps up the -moz-transform matrix in a change-of-basis matrix pair that
* translates from local coordinate space to transform coordinate space, then
* hands it back.
*/
gfx3DMatrix
nsDisplayTransform::GetResultingTransformMatrix(const FrameTransformProperties& aProperties,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor)
{
return GetResultingTransformMatrixInternal(aProperties, aOrigin, aAppUnitsPerPixel,
aBoundsOverride, aOutAncestor, false);
}
gfx3DMatrix
nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor,
bool aOffsetByOrigin)
{
FrameTransformProperties props(aFrame,
aAppUnitsPerPixel,
aBoundsOverride);
return GetResultingTransformMatrixInternal(props, aOrigin, aAppUnitsPerPixel,
aBoundsOverride, aOutAncestor,
aOffsetByOrigin);
}
gfx3DMatrix
nsDisplayTransform::GetResultingTransformMatrixInternal(const FrameTransformProperties& aProperties,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor,
bool aOffsetByOrigin)
{
const nsIFrame *frame = aProperties.mFrame;
if (aOutAncestor) {
*aOutAncestor = nsLayoutUtils::GetCrossDocParentFrame(frame);
}
/* Get the underlying transform matrix. This requires us to get the
* bounds of the frame.
*/
nsRect bounds = (aBoundsOverride ? *aBoundsOverride :
nsDisplayTransform::GetFrameBoundsForTransform(frame));
/* Get the matrix, then change its basis to factor in the origin. */
bool dummy;
gfx3DMatrix result;
// Call IsSVGTransformed() regardless of the value of
// disp->mSpecifiedTransform, since we still need any transformFromSVGParent.
Matrix svgTransform, transformFromSVGParent;
bool hasSVGTransforms =
frame && frame->IsSVGTransformed(&svgTransform, &transformFromSVGParent);
/* Transformed frames always have a transform, or are preserving 3d (and might still have perspective!) */
if (aProperties.mTransformList) {
result = nsStyleTransformMatrix::ReadTransforms(aProperties.mTransformList->mHead,
frame ? frame->StyleContext() : nullptr,
frame ? frame->PresContext() : nullptr,
dummy, bounds, aAppUnitsPerPixel);
} else if (hasSVGTransforms) {
// Correct the translation components for zoom:
float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() /
aAppUnitsPerPixel;
svgTransform._31 *= pixelsPerCSSPx;
svgTransform._32 *= pixelsPerCSSPx;
result = gfx3DMatrix::From2D(ThebesMatrix(svgTransform));
}
if (hasSVGTransforms && !transformFromSVGParent.IsIdentity()) {
// Correct the translation components for zoom:
float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() /
aAppUnitsPerPixel;
transformFromSVGParent._31 *= pixelsPerCSSPx;
transformFromSVGParent._32 *= pixelsPerCSSPx;
result = result * gfx3DMatrix::From2D(ThebesMatrix(transformFromSVGParent));
}
if (aProperties.mChildPerspective > 0.0) {
gfx3DMatrix perspective;
perspective._34 =
-1.0 / NSAppUnitsToFloatPixels(aProperties.mChildPerspective, aAppUnitsPerPixel);
/* At the point when perspective is applied, we have been translated to the transform origin.
* The translation to the perspective origin is the difference between these values.
*/
perspective.ChangeBasis(aProperties.mToPerspectiveOrigin - aProperties.mToTransformOrigin);
result = result * perspective;
}
/* Account for the -moz-transform-origin property by translating the
* coordinate space to the new origin.
*/
Point3D newOrigin =
Point3D(NSAppUnitsToFloatPixels(aOrigin.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aOrigin.y, aAppUnitsPerPixel),
0.0f);
Point3D roundedOrigin(hasSVGTransforms ? newOrigin.x : NS_round(newOrigin.x),
hasSVGTransforms ? newOrigin.y : NS_round(newOrigin.y),
0);
Point3D offsetBetweenOrigins = roundedOrigin + aProperties.mToTransformOrigin;
if (frame && frame->Preserves3D()) {
// Include the transform set on our parent
NS_ASSERTION(frame->GetParent() &&
frame->GetParent()->IsTransformed() &&
frame->GetParent()->Preserves3DChildren(),
"Preserve3D mismatch!");
FrameTransformProperties props(frame->GetParent(),
aAppUnitsPerPixel,
nullptr);
// If this frame isn't transformed (but we exist for backface-visibility),
// then we're not a reference frame so no offset to origin will be added. Our
// parent transform however *is* the reference frame, so we pass true for
// aOffsetByOrigin to convert into the correct coordinate space.
gfx3DMatrix parent =
GetResultingTransformMatrixInternal(props,
aOrigin - frame->GetPosition(),
aAppUnitsPerPixel, nullptr,
aOutAncestor, !frame->IsTransformed());
result.ChangeBasis(offsetBetweenOrigins);
result = result * parent;
if (aOffsetByOrigin) {
result.Translate(roundedOrigin);
}
return result;
}
if (aOffsetByOrigin) {
// We can fold the final translation by roundedOrigin into the first matrix
// basis change translation. This is more stable against variation due to
// insufficient floating point precision than reversing the translation
// afterwards.
result.Translate(-aProperties.mToTransformOrigin);
result.TranslatePost(offsetBetweenOrigins);
} else {
result.ChangeBasis(offsetBetweenOrigins);
}
return result;
}
bool
nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
{
if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_opacity)) {
return true;
}
if (nsLayoutUtils::IsAnimationLoggingEnabled()) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation disabled because frame was not marked active for opacity animation");
AnimationPlayerCollection::LogAsyncAnimationFailure(message,
Frame()->GetContent());
}
return false;
}
bool
nsDisplayTransform::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
{
if (mPrerender) {
return true;
}
DebugOnly<bool> prerender = ShouldPrerenderTransformedContent(aBuilder, mFrame, true);
NS_ASSERTION(!prerender, "Something changed under us!");
return false;
}
/* static */ bool
nsDisplayTransform::ShouldPrerenderTransformedContent(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
bool aLogAnimations)
{
// Elements whose transform has been modified recently, or which
// have a compositor-animated transform, can be prerendered. An element
// might have only just had its transform animated in which case
// the ActiveLayerManager may not have been notified yet.
if (!ActiveLayerTracker::IsStyleAnimated(aFrame, eCSSProperty_transform) &&
(!aFrame->GetContent() ||
!nsLayoutUtils::HasAnimationsForCompositor(aFrame->GetContent(),
eCSSProperty_transform))) {
if (aLogAnimations) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation disabled because frame was not marked active for transform animation");
AnimationPlayerCollection::LogAsyncAnimationFailure(message,
aFrame->GetContent());
}
return false;
}
nsSize refSize = aBuilder->RootReferenceFrame()->GetSize();
// Only prerender if the transformed frame's size is <= the
// reference frame size (~viewport), allowing a 1/8th fuzz factor
// for shadows, borders, etc.
refSize += nsSize(refSize.width / 8, refSize.height / 8);
nsSize frameSize = aFrame->GetVisualOverflowRectRelativeToSelf().Size();
nscoord maxInAppUnits = nscoord_MAX;
if (frameSize <= refSize) {
maxInAppUnits = aFrame->PresContext()->DevPixelsToAppUnits(4096);
nsRect visual = aFrame->GetVisualOverflowRect();
if (visual.width <= maxInAppUnits && visual.height <= maxInAppUnits) {
return true;
}
}
if (aLogAnimations) {
nsRect visual = aFrame->GetVisualOverflowRect();
nsCString message;
message.AppendLiteral("Performance warning: Async animation disabled because frame size (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameSize.width));
message.AppendLiteral(", ");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameSize.height));
message.AppendLiteral(") is bigger than the viewport (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.width));
message.AppendLiteral(", ");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.height));
message.AppendLiteral(") or the visual rectangle (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(visual.width));
message.AppendLiteral(", ");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(visual.height));
message.AppendLiteral(") is larger than the max allowable value (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(maxInAppUnits));
message.Append(')');
AnimationPlayerCollection::LogAsyncAnimationFailure(message,
aFrame->GetContent());
}
return false;
}
/* If the matrix is singular, or a hidden backface is shown, the frame won't be visible or hit. */
static bool IsFrameVisible(nsIFrame* aFrame, const Matrix4x4& aMatrix)
{
if (aMatrix.IsSingular()) {
return false;
}
if (aFrame->StyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN &&
aMatrix.IsBackfaceVisible()) {
return false;
}
return true;
}
const Matrix4x4&
nsDisplayTransform::GetTransform()
{
if (mTransform.IsIdentity()) {
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
Point3D newOrigin =
Point3D(NSAppUnitsToFloatPixels(mToReferenceFrame.x, scale),
NSAppUnitsToFloatPixels(mToReferenceFrame.y, scale),
0.0f);
if (mTransformGetter) {
mTransform = mTransformGetter(mFrame, scale);
mTransform.ChangeBasis(newOrigin.x, newOrigin.y, newOrigin.z);
} else {
/**
* Passing true as the final argument means that we want to shift the
* coordinates to be relative to our reference frame instead of relative
* to this frame.
* When we have preserve-3d, our reference frame is already guaranteed
* to be an ancestor of the preserve-3d chain, so we only need to do
* this once.
*/
mTransform = ToMatrix4x4(
GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale,
nullptr, nullptr, mFrame->IsTransformed()));
}
}
return mTransform;
}
bool
nsDisplayTransform::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
return ShouldPrerender();
}
already_AddRefed<Layer> nsDisplayTransform::BuildLayer(nsDisplayListBuilder *aBuilder,
LayerManager *aManager,
const ContainerLayerParameters& aContainerParameters)
{
const Matrix4x4& newTransformMatrix = GetTransform();
if (mFrame->StyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN &&
newTransformMatrix.IsBackfaceVisible()) {
return nullptr;
}
uint32_t flags = ShouldPrerender() ?
FrameLayerBuilder::CONTAINER_NOT_CLIPPED_BY_ANCESTORS : 0;
nsRefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mStoredList.GetChildren(),
aContainerParameters, &newTransformMatrix, flags);
if (!container) {
return nullptr;
}
// Add the preserve-3d flag for this layer, BuildContainerLayerFor clears all flags,
// so we never need to explicitely unset this flag.
if (mFrame->Preserves3D() || mFrame->Preserves3DChildren()) {
container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_PRESERVE_3D);
} else {
container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_PRESERVE_3D);
}
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, mFrame,
eCSSProperty_transform);
if (ShouldPrerender()) {
container->SetUserData(nsIFrame::LayerIsPrerenderedDataKey(),
/*the value is irrelevant*/nullptr);
container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_MAY_CHANGE_TRANSFORM);
} else {
container->RemoveUserData(nsIFrame::LayerIsPrerenderedDataKey());
container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_MAY_CHANGE_TRANSFORM);
}
return container.forget();
}
nsDisplayItem::LayerState
nsDisplayTransform::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) {
// If the transform is 3d, or the layer takes part in preserve-3d sorting
// then we *always* want this to be an active layer.
if (!GetTransform().Is2D() || mFrame->Preserves3D()) {
return LAYER_ACTIVE_FORCE;
}
// Here we check if the *post-transform* bounds of this item are big enough
// to justify an active layer.
if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_transform) &&
!IsItemTooSmallForActiveLayer(this))
return LAYER_ACTIVE;
if (mFrame->GetContent()) {
if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(),
eCSSProperty_transform)) {
return LAYER_ACTIVE;
}
}
const nsStyleDisplay* disp = mFrame->StyleDisplay();
if ((disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_TRANSFORM)) {
return LAYER_ACTIVE;
}
// Expect the child display items to have this frame as their animated
// geometry root (since it will be their reference frame). If they have a
// different animated geometry root, we'll make this an active layer so the
// animation can be accelerated.
return RequiredLayerStateForChildren(aBuilder, aManager, aParameters,
*mStoredList.GetChildren(), Frame());
}
bool nsDisplayTransform::ComputeVisibility(nsDisplayListBuilder *aBuilder,
nsRegion *aVisibleRegion)
{
/* As we do this, we need to be sure to
* untransform the visible rect, since we want everything that's painting to
* think that it's painting in its original rectangular coordinate space.
* If we can't untransform, take the entire overflow rect */
nsRect untransformedVisibleRect;
if (ShouldPrerender() ||
!UntransformVisibleRect(aBuilder, &untransformedVisibleRect))
{
untransformedVisibleRect = mFrame->GetVisualOverflowRectRelativeToSelf();
}
nsRegion untransformedVisible = untransformedVisibleRect;
// Call RecomputeVisiblity instead of ComputeVisibility since
// nsDisplayItem::ComputeVisibility should only be called from
// nsDisplayList::ComputeVisibility (which sets mVisibleRect on the item)
mStoredList.RecomputeVisibility(aBuilder, &untransformedVisible);
return true;
}
#ifdef DEBUG_HIT
#include <time.h>
#endif
/* HitTest does some fun stuff with matrix transforms to obtain the answer. */
void nsDisplayTransform::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
/* Here's how this works:
* 1. Get the matrix. If it's singular, abort (clearly we didn't hit
* anything).
* 2. Invert the matrix.
* 3. Use it to transform the rect into the correct space.
* 4. Pass that rect down through to the list's version of HitTest.
*/
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 matrix = GetTransform();
if (!IsFrameVisible(mFrame, matrix)) {
return;
}
/* We want to go from transformed-space to regular space.
* Thus we have to invert the matrix, which normally does
* the reverse operation (e.g. regular->transformed)
*/
/* Now, apply the transform and pass it down the channel. */
matrix.Invert();
nsRect resultingRect;
if (aRect.width == 1 && aRect.height == 1) {
// Magic width/height indicating we're hit testing a point, not a rect
Point4D point = matrix.ProjectPoint(Point(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor)));
if (!point.HasPositiveWCoord()) {
return;
}
Point point2d = point.As2DPoint();
resultingRect = nsRect(NSFloatPixelsToAppUnits(float(point2d.x), factor),
NSFloatPixelsToAppUnits(float(point2d.y), factor),
1, 1);
} else {
Rect originalRect(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor),
NSAppUnitsToFloatPixels(aRect.width, factor),
NSAppUnitsToFloatPixels(aRect.height, factor));
Rect rect = matrix.ProjectRectBounds(originalRect);
bool snap;
nsRect childBounds = mStoredList.GetBounds(aBuilder, &snap);
Rect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor),
NSAppUnitsToFloatPixels(childBounds.y, factor),
NSAppUnitsToFloatPixels(childBounds.width, factor),
NSAppUnitsToFloatPixels(childBounds.height, factor));
rect = rect.Intersect(childGfxBounds);
resultingRect = nsRect(NSFloatPixelsToAppUnits(float(rect.X()), factor),
NSFloatPixelsToAppUnits(float(rect.Y()), factor),
NSFloatPixelsToAppUnits(float(rect.Width()), factor),
NSFloatPixelsToAppUnits(float(rect.Height()), factor));
}
if (resultingRect.IsEmpty()) {
return;
}
#ifdef DEBUG_HIT
printf("Frame: %p\n", dynamic_cast<void *>(mFrame));
printf(" Untransformed point: (%f, %f)\n", resultingRect.X(), resultingRect.Y());
uint32_t originalFrameCount = aOutFrames.Length();
#endif
mStoredList.HitTest(aBuilder, resultingRect, aState, aOutFrames);
#ifdef DEBUG_HIT
if (originalFrameCount != aOutFrames.Length())
printf(" Hit! Time: %f, first frame: %p\n", static_cast<double>(clock()),
dynamic_cast<void *>(aOutFrames.ElementAt(0)));
printf("=== end of hit test ===\n");
#endif
}
float
nsDisplayTransform::GetHitDepthAtPoint(nsDisplayListBuilder* aBuilder, const nsPoint& aPoint)
{
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 matrix = GetTransform();
NS_ASSERTION(IsFrameVisible(mFrame, matrix), "We can't have hit a frame that isn't visible!");
Matrix4x4 inverse = matrix;
inverse.Invert();
Point4D point = inverse.ProjectPoint(Point(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor)));
NS_ASSERTION(point.HasPositiveWCoord(), "Why are we trying to get the depth for a point we didn't hit?");
Point point2d = point.As2DPoint();
Point3D transformed = matrix * Point3D(point2d.x, point2d.y, 0);
return transformed.z;
}
/* The bounding rectangle for the object is the overflow rectangle translated
* by the reference point.
*/
nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder *aBuilder, bool* aSnap)
{
nsRect untransformedBounds = ShouldPrerender() ?
mFrame->GetVisualOverflowRectRelativeToSelf() :
mStoredList.GetBounds(aBuilder, aSnap);
*aSnap = false;
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
return nsLayoutUtils::MatrixTransformRect(untransformedBounds,
To3DMatrix(GetTransform()),
factor);
}
/* The transform is opaque iff the transform consists solely of scales and
* translations and if the underlying content is opaque. Thus if the transform
* is of the form
*
* |a c e|
* |b d f|
* |0 0 1|
*
* We need b and c to be zero.
*
* We also need to check whether the underlying opaque content completely fills
* our visible rect. We use UntransformRect which expands to the axis-aligned
* bounding rect, but that's OK since if
* mStoredList.GetVisibleRect().Contains(untransformedVisible), then it
* certainly contains the actual (non-axis-aligned) untransformed rect.
*/
nsRegion nsDisplayTransform::GetOpaqueRegion(nsDisplayListBuilder *aBuilder,
bool* aSnap)
{
*aSnap = false;
nsRect untransformedVisible;
// If we're going to prerender all our content, pretend like we
// don't have opqaue content so that everything under us is rendered
// as well. That will increase graphics memory usage if our frame
// covers the entire window, but it allows our transform to be
// updated extremely cheaply, without invalidating any other
// content.
if (ShouldPrerender() ||
!UntransformVisibleRect(aBuilder, &untransformedVisible)) {
return nsRegion();
}
const Matrix4x4& matrix = GetTransform();
nsRegion result;
Matrix matrix2d;
bool tmpSnap;
if (matrix.Is2D(&matrix2d) &&
matrix2d.PreservesAxisAlignedRectangles() &&
mStoredList.GetOpaqueRegion(aBuilder, &tmpSnap).Contains(untransformedVisible)) {
result = mVisibleRect.Intersect(GetBounds(aBuilder, &tmpSnap));
}
return result;
}
/* The transform is uniform if it fills the entire bounding rect and the
* wrapped list is uniform. See GetOpaqueRegion for discussion of why this
* works.
*/
bool nsDisplayTransform::IsUniform(nsDisplayListBuilder *aBuilder, nscolor* aColor)
{
nsRect untransformedVisible;
if (!UntransformVisibleRect(aBuilder, &untransformedVisible)) {
return false;
}
const Matrix4x4& matrix = GetTransform();
Matrix matrix2d;
return matrix.Is2D(&matrix2d) &&
matrix2d.PreservesAxisAlignedRectangles() &&
mStoredList.GetVisibleRect().Contains(untransformedVisible) &&
mStoredList.IsUniform(aBuilder, aColor);
}
/* If UNIFIED_CONTINUATIONS is defined, we can merge two display lists that
* share the same underlying content. Otherwise, doing so results in graphical
* glitches.
*/
#ifndef UNIFIED_CONTINUATIONS
bool
nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder,
nsDisplayItem *aItem)
{
return false;
}
#else
bool
nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder,
nsDisplayItem *aItem)
{
NS_PRECONDITION(aItem, "Why did you try merging with a null item?");
NS_PRECONDITION(aBuilder, "Why did you try merging with a null builder?");
/* Make sure that we're dealing with two transforms. */
if (aItem->GetType() != TYPE_TRANSFORM)
return false;
/* Check to see that both frames are part of the same content. */
if (aItem->Frame()->GetContent() != mFrame->GetContent())
return false;
if (aItem->GetClip() != GetClip())
return false;
/* Now, move everything over to this frame and signal that
* we merged things!
*/
mStoredList.MergeFromTrackingMergedFrames(&static_cast<nsDisplayTransform*>(aItem)->mStoredList);
return true;
}
#endif
/* TransformRect takes in as parameters a rectangle (in app space) and returns
* the smallest rectangle (in app space) containing the transformed image of
* that rectangle. That is, it takes the four corners of the rectangle,
* transforms them according to the matrix associated with the specified frame,
* then returns the smallest rectangle containing the four transformed points.
*
* @param aUntransformedBounds The rectangle (in app units) to transform.
* @param aFrame The frame whose transformation should be applied.
* @param aOrigin The delta from the frame origin to the coordinate space origin
* @param aBoundsOverride (optional) Force the frame bounds to be the
* specified bounds.
* @return The smallest rectangle containing the image of the transformed
* rectangle.
*/
nsRect nsDisplayTransform::TransformRect(const nsRect &aUntransformedBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
const nsRect* aBoundsOverride)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
return nsLayoutUtils::MatrixTransformRect
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride),
factor);
}
nsRect nsDisplayTransform::TransformRectOut(const nsRect &aUntransformedBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
const nsRect* aBoundsOverride)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
return nsLayoutUtils::MatrixTransformRectOut
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride),
factor);
}
bool nsDisplayTransform::UntransformRect(const nsRect &aTransformedBounds,
const nsRect &aChildBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
nsRect *aOutRect)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
gfx3DMatrix transform = GetResultingTransformMatrix(aFrame, aOrigin, factor, nullptr);
if (transform.IsSingular()) {
return false;
}
Rect result(NSAppUnitsToFloatPixels(aTransformedBounds.x, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.y, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.width, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.height, factor));
Rect childGfxBounds(NSAppUnitsToFloatPixels(aChildBounds.x, factor),
NSAppUnitsToFloatPixels(aChildBounds.y, factor),
NSAppUnitsToFloatPixels(aChildBounds.width, factor),
NSAppUnitsToFloatPixels(aChildBounds.height, factor));
result = ToMatrix4x4(transform.Inverse()).ProjectRectBounds(result);
result = result.Intersect(childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
return true;
}
bool nsDisplayTransform::UntransformVisibleRect(nsDisplayListBuilder* aBuilder,
nsRect *aOutRect)
{
const gfx3DMatrix& matrix = To3DMatrix(GetTransform());
if (matrix.IsSingular())
return false;
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
Rect result(NSAppUnitsToFloatPixels(mVisibleRect.x, factor),
NSAppUnitsToFloatPixels(mVisibleRect.y, factor),
NSAppUnitsToFloatPixels(mVisibleRect.width, factor),
NSAppUnitsToFloatPixels(mVisibleRect.height, factor));
bool snap;
nsRect childBounds = mStoredList.GetBounds(aBuilder, &snap);
Rect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor),
NSAppUnitsToFloatPixels(childBounds.y, factor),
NSAppUnitsToFloatPixels(childBounds.width, factor),
NSAppUnitsToFloatPixels(childBounds.height, factor));
/* We want to untransform the matrix, so invert the transformation first! */
result = ToMatrix4x4(matrix.Inverse()).ProjectRectBounds(result);
result = result.Intersect(childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
return true;
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayTransform::WriteDebugInfo(nsACString& aTo)
{
std::stringstream ss;
AppendToString(ss, GetTransform());
aTo += ss.str().c_str();
}
#endif
nsDisplaySVGEffects::nsDisplaySVGEffects(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList),
mEffectsBounds(aFrame->GetVisualOverflowRectRelativeToSelf())
{
MOZ_COUNT_CTOR(nsDisplaySVGEffects);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplaySVGEffects::~nsDisplaySVGEffects()
{
MOZ_COUNT_DTOR(nsDisplaySVGEffects);
}
#endif
nsRegion nsDisplaySVGEffects::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap)
{
*aSnap = false;
return nsRegion();
}
void
nsDisplaySVGEffects::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2);
if (nsSVGIntegrationUtils::HitTestFrameForEffects(mFrame,
rectCenter - ToReferenceFrame())) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
}
void
nsDisplaySVGEffects::PaintAsLayer(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
LayerManager* aManager)
{
nsSVGIntegrationUtils::PaintFramesWithEffects(aCtx, mFrame,
mVisibleRect,
aBuilder, aManager);
}
LayerState
nsDisplaySVGEffects::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return LAYER_SVG_EFFECTS;
}
already_AddRefed<Layer>
nsDisplaySVGEffects::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
const nsIContent* content = mFrame->GetContent();
bool hasSVGLayout = (mFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT);
if (hasSVGLayout) {
nsISVGChildFrame *svgChildFrame = do_QueryFrame(mFrame);
if (!svgChildFrame || !mFrame->GetContent()->IsSVG()) {
NS_ASSERTION(false, "why?");
return nullptr;
}
if (!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return nullptr; // The SVG spec says not to draw filters for this
}
}
float opacity = mFrame->StyleDisplay()->mOpacity;
if (opacity == 0.0f)
return nullptr;
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
bool isOK = effectProperties.HasNoFilterOrHasValidFilter();
effectProperties.GetClipPathFrame(&isOK);
effectProperties.GetMaskFrame(&isOK);
if (!isOK) {
return nullptr;
}
ContainerLayerParameters newContainerParameters = aContainerParameters;
if (effectProperties.HasValidFilter()) {
newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true;
}
nsRefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr);
return container.forget();
}
bool nsDisplaySVGEffects::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
nsPoint offset = ToReferenceFrame();
nsRect dirtyRect =
nsSVGIntegrationUtils::GetRequiredSourceForInvalidArea(mFrame,
mVisibleRect - offset) +
offset;
// Our children may be made translucent or arbitrarily deformed so we should
// not allow them to subtract area from aVisibleRegion.
nsRegion childrenVisible(dirtyRect);
nsRect r = dirtyRect.Intersect(mList.GetBounds(aBuilder));
mList.ComputeVisibilityForSublist(aBuilder, &childrenVisible, r);
return true;
}
bool nsDisplaySVGEffects::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
{
if (aItem->GetType() != TYPE_SVG_EFFECTS)
return false;
// items for the same content element should be merged into a single
// compositing group
// aItem->GetUnderlyingFrame() returns non-null because it's nsDisplaySVGEffects
if (aItem->Frame()->GetContent() != mFrame->GetContent())
return false;
if (aItem->GetClip() != GetClip())
return false;
nsDisplaySVGEffects* other = static_cast<nsDisplaySVGEffects*>(aItem);
MergeFromTrackingMergedFrames(other);
mEffectsBounds.UnionRect(mEffectsBounds,
other->mEffectsBounds + other->mFrame->GetOffsetTo(mFrame));
return true;
}
gfxRect
nsDisplaySVGEffects::BBoxInUserSpace() const
{
return nsSVGUtils::GetBBox(mFrame);
}
gfxPoint
nsDisplaySVGEffects::UserSpaceOffset() const
{
return nsSVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(mFrame);
}
void
nsDisplaySVGEffects::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsDisplaySVGEffectsGeometry* geometry =
static_cast<const nsDisplaySVGEffectsGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
if (geometry->mFrameOffsetToReferenceFrame != ToReferenceFrame() ||
geometry->mUserSpaceOffset != UserSpaceOffset() ||
!geometry->mBBox.IsEqualInterior(BBoxInUserSpace())) {
// Filter and mask output can depend on the location of the frame's user
// space and on the frame's BBox. We need to invalidate if either of these
// change relative to the reference frame.
// Invalidations from our inactive layer manager are not enough to catch
// some of these cases because filters can produce output even if there's
// nothing in the filter input.
aInvalidRegion->Or(bounds, geometry->mBounds);
}
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplaySVGEffects::PrintEffects(nsACString& aTo)
{
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
bool isOK = true;
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame(&isOK);
bool first = true;
aTo += " effects=(";
if (mFrame->StyleDisplay()->mOpacity != 1.0f) {
first = false;
aTo += nsPrintfCString("opacity(%f)", mFrame->StyleDisplay()->mOpacity);
}
if (clipPathFrame) {
if (!first) {
aTo += ", ";
}
aTo += nsPrintfCString("clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial");
first = false;
}
if (effectProperties.HasValidFilter()) {
if (!first) {
aTo += ", ";
}
aTo += "filter";
first = false;
}
if (effectProperties.GetMaskFrame(&isOK)) {
if (!first) {
aTo += ", ";
}
aTo += "mask";
}
aTo += ")";
}
#endif