gecko-dev/layout/base/nsDisplayList.cpp
CJKu ffc22638a9 Bug 1269971 - Part 5. Correct draw region in nsDisplayBackgroundColor::Paint; r=jfkthame
MozReview-Commit-ID: LV8lP6NuV85

--HG--
extra : rebase_source : 43a33cf310b644daf55676962c4f5e9ce510e0af
2016-05-13 00:09:16 +08:00

6844 lines
244 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 "gfxUtils.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "mozilla/gfx/2D.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 "gfxVR.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 "nsViewManager.h"
#include "ImageLayers.h"
#include "ImageContainer.h"
#include "nsCanvasFrame.h"
#include "StickyScrollContainer.h"
#include "mozilla/AnimationPerformanceWarning.h"
#include "mozilla/AnimationUtils.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/PendingAnimationTracker.h"
#include "mozilla/Poison.h"
#include "mozilla/Preferences.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/unused.h"
#include "ActiveLayerTracker.h"
#include "nsContentUtils.h"
#include "nsPrintfCString.h"
#include "UnitTransforms.h"
#include "LayersLogging.h"
#include "FrameLayerBuilder.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/RestyleManager.h"
#include "nsCaret.h"
#include "nsISelection.h"
#include "nsDOMTokenList.h"
#include "mozilla/RuleNodeCacheConditions.h"
#include "nsCSSProps.h"
#include "nsPluginFrame.h"
#include "DisplayItemScrollClip.h"
// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
// GetTickCount().
#ifdef GetCurrentTime
#undef GetCurrentTime
#endif
using namespace mozilla;
using namespace mozilla::layers;
using namespace mozilla::dom;
using namespace mozilla::layout;
using namespace mozilla::gfx;
typedef FrameMetrics::ViewID ViewID;
typedef nsStyleTransformMatrix::TransformReferenceBox TransformReferenceBox;
#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
void*
AnimatedGeometryRoot::operator new(size_t aSize, nsDisplayListBuilder* aBuilder)
{
return aBuilder->Allocate(aSize);
}
static inline CSSAngle
MakeCSSAngle(const nsCSSValue& aValue)
{
return CSSAngle(aValue.GetAngleValue(), aValue.GetUnit());
}
static void AddTransformFunctions(nsCSSValueList* aList,
nsStyleContext* aContext,
nsPresContext* aPresContext,
TransformReferenceBox& aRefBox,
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();
RuleNodeCacheConditions conditions;
switch (nsStyleTransformMatrix::TransformFunctionOf(array)) {
case eCSSKeyword_rotatex:
{
CSSAngle theta = MakeCSSAngle(array->Item(1));
aFunctions.AppendElement(RotationX(theta));
break;
}
case eCSSKeyword_rotatey:
{
CSSAngle theta = MakeCSSAngle(array->Item(1));
aFunctions.AppendElement(RotationY(theta));
break;
}
case eCSSKeyword_rotatez:
{
CSSAngle theta = MakeCSSAngle(array->Item(1));
aFunctions.AppendElement(RotationZ(theta));
break;
}
case eCSSKeyword_rotate:
{
CSSAngle theta = MakeCSSAngle(array->Item(1));
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();
CSSAngle theta = MakeCSSAngle(array->Item(4));
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, conditions,
&aRefBox, &TransformReferenceBox::Width);
aFunctions.AppendElement(Translation(x, 0, 0));
break;
}
case eCSSKeyword_translatey:
{
double y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, conditions,
&aRefBox, &TransformReferenceBox::Height);
aFunctions.AppendElement(Translation(0, y, 0));
break;
}
case eCSSKeyword_translatez:
{
double z = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, conditions,
nullptr);
aFunctions.AppendElement(Translation(0, 0, z));
break;
}
case eCSSKeyword_translate:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, conditions,
&aRefBox, &TransformReferenceBox::Width);
// translate(x) is shorthand for translate(x, 0)
double y = 0;
if (array->Count() == 3) {
y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(2), aContext, aPresContext, conditions,
&aRefBox, &TransformReferenceBox::Height);
}
aFunctions.AppendElement(Translation(x, y, 0));
break;
}
case eCSSKeyword_translate3d:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, conditions,
&aRefBox, &TransformReferenceBox::Width);
double y = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(2), aContext, aPresContext, conditions,
&aRefBox, &TransformReferenceBox::Height);
double z = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(3), aContext, aPresContext, conditions,
nullptr);
aFunctions.AppendElement(Translation(x, y, z));
break;
}
case eCSSKeyword_skewx:
{
CSSAngle x = MakeCSSAngle(array->Item(1));
aFunctions.AppendElement(SkewX(x));
break;
}
case eCSSKeyword_skewy:
{
CSSAngle y = MakeCSSAngle(array->Item(1));
aFunctions.AppendElement(SkewY(y));
break;
}
case eCSSKeyword_skew:
{
CSSAngle x = MakeCSSAngle(array->Item(1));
// skew(x) is shorthand for skew(x, 0)
CSSAngle y(0.0f, eCSSUnit_Degree);
if (array->Count() == 3) {
y = MakeCSSAngle(array->Item(2));
}
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:
{
bool dummy;
Matrix4x4 matrix;
nsStyleTransformMatrix::ProcessInterpolateMatrix(matrix, array,
aContext,
aPresContext,
conditions,
aRefBox,
&dummy);
aFunctions.AppendElement(TransformMatrix(matrix));
break;
}
case eCSSKeyword_perspective:
{
aFunctions.AppendElement(Perspective(array->Item(1).GetFloatValue()));
break;
}
default:
NS_ERROR("Function not handled yet!");
}
}
}
static TimingFunction
ToTimingFunction(const Maybe<ComputedTimingFunction>& aCTF)
{
if (aCTF.isNothing()) {
return TimingFunction(null_t());
}
if (aCTF->HasSpline()) {
const nsSMILKeySpline* spline = aCTF->GetFunction();
return TimingFunction(CubicBezierFunction(spline->X1(), spline->Y1(),
spline->X2(), spline->Y2()));
}
uint32_t type = aCTF->GetType() == nsTimingFunction::Type::StepStart ? 1 : 2;
return TimingFunction(StepFunction(aCTF->GetSteps(), type));
}
static void
AddAnimationForProperty(nsIFrame* aFrame, const AnimationProperty& aProperty,
dom::Animation* aAnimation, Layer* aLayer,
AnimationData& aData, bool aPending)
{
MOZ_ASSERT(aLayer->AsContainerLayer(), "Should only animate ContainerLayer");
MOZ_ASSERT(aAnimation->GetEffect(),
"Should not be adding an animation without an effect");
MOZ_ASSERT(!aAnimation->GetCurrentOrPendingStartTime().IsNull() ||
(aAnimation->GetTimeline() &&
aAnimation->GetTimeline()->TracksWallclockTime()),
"Animation should either have a resolved start time or "
"a timeline that tracks wallclock time");
nsStyleContext* styleContext = aFrame->StyleContext();
nsPresContext* presContext = aFrame->PresContext();
TransformReferenceBox refBox(aFrame);
layers::Animation* animation =
aPending ?
aLayer->AddAnimationForNextTransaction() :
aLayer->AddAnimation();
const TimingParams& timing = aAnimation->GetEffect()->SpecifiedTiming();
const ComputedTiming computedTiming =
aAnimation->GetEffect()->GetComputedTiming();
Nullable<TimeDuration> startTime = aAnimation->GetCurrentOrPendingStartTime();
animation->startTime() = startTime.IsNull()
? TimeStamp()
: aAnimation->AnimationTimeToTimeStamp(
StickyTimeDuration(timing.mDelay));
animation->initialCurrentTime() = aAnimation->GetCurrentTime().Value()
- timing.mDelay;
animation->duration() = computedTiming.mDuration;
animation->iterations() = computedTiming.mIterations;
animation->iterationStart() = computedTiming.mIterationStart;
animation->direction() = static_cast<uint32_t>(timing.mDirection);
animation->property() = aProperty.mProperty;
animation->playbackRate() = aAnimation->PlaybackRate();
animation->data() = aData;
animation->easingFunction() = ToTimingFunction(timing.mFunction);
for (uint32_t segIdx = 0; segIdx < aProperty.mSegments.Length(); segIdx++) {
const AnimationPropertySegment& segment = aProperty.mSegments[segIdx];
AnimationSegment* animSegment = animation->segments().AppendElement();
if (aProperty.mProperty == eCSSProperty_transform) {
animSegment->startState() = InfallibleTArray<TransformFunction>();
animSegment->endState() = InfallibleTArray<TransformFunction>();
nsCSSValueSharedList* list =
segment.mFromValue.GetCSSValueSharedListValue();
AddTransformFunctions(list->mHead, styleContext, presContext, refBox,
animSegment->startState().get_ArrayOfTransformFunction());
list = segment.mToValue.GetCSSValueSharedListValue();
AddTransformFunctions(list->mHead, styleContext, presContext, refBox,
animSegment->endState().get_ArrayOfTransformFunction());
} else if (aProperty.mProperty == 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,
nsTArray<RefPtr<dom::Animation>>& aAnimations,
Layer* aLayer, AnimationData& aData,
bool aPending)
{
MOZ_ASSERT(nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR),
"inconsistent property flags");
// Add from first to last (since last overrides)
for (size_t animIdx = 0; animIdx < aAnimations.Length(); animIdx++) {
dom::Animation* anim = aAnimations[animIdx];
if (!anim->IsPlaying()) {
continue;
}
dom::KeyframeEffectReadOnly* effect = anim->GetEffect();
MOZ_ASSERT(effect, "A playing animation should have an effect");
const AnimationProperty* property =
effect->GetAnimationOfProperty(aProperty);
if (!property) {
continue;
}
// Note that if mWinsInCascade on property was false,
// GetAnimationOfProperty returns null instead.
// This is what we want, since if we have an animation or transition
// that isn't actually winning in the CSS cascade, we don't want to
// send it to the compositor.
// I believe that anything that changes mWinsInCascade should
// trigger this code again, either because of a restyle that changes
// the properties in question, or because of the main-thread style
// update that results when an animation stops being in effect.
MOZ_ASSERT(property->mWinsInCascade,
"GetAnimationOfProperty already tested mWinsInCascade");
// Don't add animations that are pending if their timeline does not
// track wallclock time. This is because any pending animations on layers
// will have their start time updated with the current wallclock time.
// If we can't convert that wallclock time back to an equivalent timeline
// time, we won't be able to update the content animation and it will end
// up being out of sync with the layer animation.
//
// Currently this only happens when the timeline is driven by a refresh
// driver under test control. In this case, the next time the refresh
// driver is advanced it will trigger any pending animations.
if (anim->PlayState() == AnimationPlayState::Pending &&
(!anim->GetTimeline() ||
!anim->GetTimeline()->TracksWallclockTime())) {
continue;
}
AddAnimationForProperty(aFrame, *property, anim, aLayer, aData, aPending);
effect->SetIsRunningOnCompositor(aProperty, true);
}
}
static void
GenerateAndPushTextMask(nsIFrame* aFrame, nsRenderingContext* aContext,
const nsRect& aFillRect)
{
// The main function of enabling background-clip:text property value.
// When a nsDisplayBackgroundImage detects "text" bg-clip style, it will call
// this function to
// 1. Paint background color of the selection text if any.
// 2. Generate a mask by all descendant text frames
// 3. Push the generated mask into aContext.
//
// TBD: we actually generate display list of aFrame twice here. It's better
// to reuse the same display list and paint that one twice, one for selection
// background, one for generating text mask.
gfxContext* sourceCtx = aContext->ThebesContext();
gfxRect bounds =
nsLayoutUtils::RectToGfxRect(aFillRect,
aFrame->PresContext()->AppUnitsPerDevPixel());
{
// Paint text selection background into sourceCtx.
gfxContextMatrixAutoSaveRestore save(sourceCtx);
sourceCtx->SetMatrix(sourceCtx->CurrentMatrix().Translate(bounds.TopLeft()));
nsLayoutUtils::PaintFrame(aContext, aFrame,
nsRect(nsPoint(0, 0), aFrame->GetSize()),
NS_RGB(255, 255, 255),
nsDisplayListBuilderMode::PAINTING_SELECTION_BACKGROUND);
}
// Evaluate required surface size.
IntRect drawRect;
{
gfxContextMatrixAutoSaveRestore matRestore(sourceCtx);
sourceCtx->SetMatrix(gfxMatrix());
gfxRect clipRect = sourceCtx->GetClipExtents();
drawRect = RoundedOut(ToRect(clipRect));
}
// Create a mask surface.
RefPtr<DrawTarget> sourceTarget = sourceCtx->GetDrawTarget();
RefPtr<DrawTarget> maskDT =
sourceTarget->CreateSimilarDrawTarget(drawRect.Size(),
SurfaceFormat::A8);
if (!maskDT) {
NS_ABORT_OOM(drawRect.width * drawRect.height);
}
RefPtr<gfxContext> maskCtx = gfxContext::ForDrawTargetWithTransform(maskDT);
gfxMatrix currentMatrix = sourceCtx->CurrentMatrix();
maskCtx->SetMatrix(gfxMatrix::Translation(bounds.TopLeft()) *
currentMatrix *
gfxMatrix::Translation(-drawRect.TopLeft()));
// Shade text shape into mask A8 surface.
nsRenderingContext rc(maskCtx);
nsLayoutUtils::PaintFrame(&rc, aFrame,
nsRect(nsPoint(0, 0), aFrame->GetSize()),
NS_RGB(255, 255, 255),
nsDisplayListBuilderMode::GENERATE_GLYPH);
// Push the generated mask into aContext, so that the caller can pop and
// blend with it.
Matrix maskTransform = ToMatrix(currentMatrix) *
Matrix::Translation(-drawRect.x, -drawRect.y);
maskTransform.Invert();
RefPtr<SourceSurface> maskSurface = maskDT->Snapshot();
sourceCtx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, 1.0, maskSurface, maskTransform);
}
/* static */ void
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(Layer* aLayer,
nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem,
nsIFrame* aFrame,
nsCSSProperty aProperty)
{
MOZ_ASSERT(nsCSSProps::PropHasFlags(aProperty,
CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR),
"inconsistent property flags");
// 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");
// Only send animations to a layer that is actually using
// off-main-thread compositing.
if (aLayer->Manager()->GetBackendType() !=
layers::LayersBackend::LAYERS_CLIENT) {
return;
}
bool pending = !aBuilder;
if (pending) {
aLayer->ClearAnimationsForNextTransaction();
} else {
aLayer->ClearAnimations();
}
// Update the animation generation on the layer. We need to do this before
// any early returns since even if we don't add any animations to the
// layer, we still need to mark it as up-to-date with regards to animations.
// Otherwise, in RestyleManager we'll notice the discrepancy between the
// animation generation numbers and update the layer indefinitely.
uint64_t animationGeneration =
RestyleManager::GetAnimationGenerationForFrame(aFrame);
aLayer->SetAnimationGeneration(animationGeneration);
EffectCompositor::ClearIsRunningOnCompositor(aFrame, aProperty);
nsTArray<RefPtr<dom::Animation>> compositorAnimations =
EffectCompositor::GetAnimationsForCompositor(aFrame, aProperty);
if (compositorAnimations.IsEmpty()) {
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)) {
// EffectCompositor needs to know that we refused to run this animation
// asynchronously so that it will not throttle the main thread
// animation.
aFrame->Properties().Set(nsIFrame::RefusedAsyncAnimationProperty(), true);
// We need to schedule another refresh driver run so that EffectCompositor
// gets a chance to unthrottle the animation.
aFrame->SchedulePaint();
return;
}
AnimationData data;
if (aProperty == eCSSProperty_transform) {
// XXX Performance here isn't ideal for SVG. We'd prefer to avoid resolving
// the dimensions of refBox. That said, we only get here if there are CSS
// animations or transitions on this element, and that is likely to be a
// lot rarer than transforms on SVG (the frequency of which drives the need
// for TransformReferenceBox).
TransformReferenceBox refBox(aFrame);
nsRect bounds(0, 0, refBox.Width(), refBox.Height());
// all data passed directly to the compositor should be in dev pixels
int32_t devPixelsToAppUnits = aFrame->PresContext()->AppUnitsPerDevPixel();
float scale = devPixelsToAppUnits;
Point3D offsetToTransformOrigin =
nsDisplayTransform::GetDeltaToTransformOrigin(aFrame, scale, &bounds);
nsPoint origin;
if (aItem) {
// This branch is for display items to leverage the cache of
// nsDisplayListBuilder.
origin = aItem->ToReferenceFrame();
} else {
// This branch is running for restyling.
// Animations are animated at the coordination of the reference
// frame outside, not the given frame itself. The given frame
// is also reference frame too, so the parent's reference frame
// are used.
nsIFrame* referenceFrame =
nsLayoutUtils::GetReferenceFrame(nsLayoutUtils::GetCrossDocParentFrame(aFrame));
origin = aFrame->GetOffsetToCrossDoc(referenceFrame);
}
data = TransformData(origin, offsetToTransformOrigin,
bounds, devPixelsToAppUnits);
} else if (aProperty == eCSSProperty_opacity) {
data = null_t();
}
AddAnimationsForProperty(aFrame, aProperty, compositorAnimations,
aLayer, data, pending);
}
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
nsDisplayListBuilderMode aMode, bool aBuildCaret)
: mReferenceFrame(aReferenceFrame),
mIgnoreScrollFrame(nullptr),
mLayerEventRegions(nullptr),
mCurrentTableItem(nullptr),
mCurrentFrame(aReferenceFrame),
mCurrentReferenceFrame(aReferenceFrame),
mCurrentAGR(&mRootAGR),
mRootAGR(aReferenceFrame, nullptr),
mUsedAGRBudget(0),
mDirtyRect(-1,-1,-1,-1),
mGlassDisplayItem(nullptr),
mScrollInfoItemsForHoisting(nullptr),
mMode(aMode),
mCurrentScrollParentId(FrameMetrics::NULL_SCROLL_ID),
mCurrentScrollbarTarget(FrameMetrics::NULL_SCROLL_ID),
mCurrentScrollbarFlags(0),
mPerspectiveItemIndex(0),
mSVGEffectsBuildingDepth(0),
mContainsBlendMode(false),
mIsBuildingScrollbar(false),
mCurrentScrollbarWillHaveLayer(false),
mBuildCaret(aBuildCaret),
mIgnoreSuppression(false),
mHadToIgnoreSuppression(false),
mIsAtRootOfPseudoStackingContext(false),
mIncludeAllOutOfFlows(false),
mDescendIntoSubdocuments(true),
mSelectedFramesOnly(false),
mAccurateVisibleRegions(false),
mAllowMergingAndFlattening(true),
mWillComputePluginGeometry(false),
mInTransform(false),
mIsInChromePresContext(false),
mSyncDecodeImages(false),
mIsPaintingToWindow(false),
mIsCompositingCheap(false),
mContainsPluginItem(false),
mAncestorHasApzAwareEventHandler(false),
mHaveScrollableDisplayPort(false),
mWindowDraggingAllowed(false),
mIsBuildingForPopup(nsLayoutUtils::IsPopup(aReferenceFrame)),
mForceLayerForScrollParent(false),
mAsyncPanZoomEnabled(nsLayoutUtils::AsyncPanZoomEnabled(aReferenceFrame))
{
MOZ_COUNT_CTOR(nsDisplayListBuilder);
PL_InitArenaPool(&mPool, "displayListArena", 4096,
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));
}
}
mFrameToAnimatedGeometryRootMap.Put(aReferenceFrame, &mRootAGR);
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;
}
}
}
bool nsDisplayListBuilder::NeedToForceTransparentSurfaceForItem(nsDisplayItem* aItem)
{
return aItem == mGlassDisplayItem || aItem->ClearsBackground();
}
AnimatedGeometryRoot*
nsDisplayListBuilder::WrapAGRForFrame(nsIFrame* aAnimatedGeometryRoot,
AnimatedGeometryRoot* aParent /* = nullptr */)
{
MOZ_ASSERT(IsAnimatedGeometryRoot(aAnimatedGeometryRoot));
AnimatedGeometryRoot* result = nullptr;
if (!mFrameToAnimatedGeometryRootMap.Get(aAnimatedGeometryRoot, &result)) {
MOZ_ASSERT(nsLayoutUtils::IsAncestorFrameCrossDoc(RootReferenceFrame(), aAnimatedGeometryRoot));
AnimatedGeometryRoot* parent = aParent;
if (!parent) {
nsIFrame* parentFrame = nsLayoutUtils::GetCrossDocParentFrame(aAnimatedGeometryRoot);
if (parentFrame) {
nsIFrame* parentAGRFrame = FindAnimatedGeometryRootFrameFor(parentFrame);
parent = WrapAGRForFrame(parentAGRFrame);
}
}
result = new (this) AnimatedGeometryRoot(aAnimatedGeometryRoot, parent);
mFrameToAnimatedGeometryRootMap.Put(aAnimatedGeometryRoot, result);
}
MOZ_ASSERT(!aParent || result->mParentAGR == aParent);
return result;
}
AnimatedGeometryRoot*
nsDisplayListBuilder::FindAnimatedGeometryRootFor(nsIFrame* aFrame)
{
if (!IsPaintingToWindow()) {
return &mRootAGR;
}
if (aFrame == mCurrentFrame) {
return mCurrentAGR;
}
AnimatedGeometryRoot* result = nullptr;
if (mFrameToAnimatedGeometryRootMap.Get(aFrame, &result)) {
return result;
}
nsIFrame* agrFrame = FindAnimatedGeometryRootFrameFor(aFrame);
result = WrapAGRForFrame(agrFrame);
mFrameToAnimatedGeometryRootMap.Put(aFrame, result);
return result;
}
AnimatedGeometryRoot*
nsDisplayListBuilder::FindAnimatedGeometryRootFor(nsDisplayItem* aItem)
{
if (aItem->ShouldFixToViewport(this)) {
// Make its active scrolled root be the active scrolled root of
// the enclosing viewport, since it shouldn't be scrolled by scrolled
// frames in its document. InvalidateFixedBackgroundFramesFromList in
// nsGfxScrollFrame will not repaint this item when scrolling occurs.
nsIFrame* viewportFrame =
nsLayoutUtils::GetClosestFrameOfType(aItem->Frame(), nsGkAtoms::viewportFrame, RootReferenceFrame());
if (viewportFrame) {
return FindAnimatedGeometryRootFor(viewportFrame);
}
}
return FindAnimatedGeometryRootFor(aItem->Frame());
}
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() &&
EffectCompositor::HasAnimationsForCompositor(aFrame,
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* oldClip = mClipState.GetClipForContainingBlockDescendants();
const DisplayItemScrollClip* sc = mClipState.GetCurrentInnermostScrollClip();
OutOfFlowDisplayData* data = new OutOfFlowDisplayData(oldClip, sc, 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);
}
}
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 (DisplayItemClip* c : mDisplayItemClipsToDestroy) {
c->DisplayItemClip::~DisplayItemClip();
}
for (DisplayItemScrollClip* c : mScrollClipsToDestroy) {
c->DisplayItemScrollClip::~DisplayItemScrollClip();
}
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() {
RefPtr<nsCaret> caret = CurrentPresShellState()->mPresShell->GetCaret();
return caret;
}
void
nsDisplayListBuilder::EnterPresShell(nsIFrame* aReferenceFrame,
bool aPointerEventsNoneDoc)
{
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;
}
bool pointerEventsNone = aPointerEventsNoneDoc;
if (IsInSubdocument()) {
pointerEventsNone |= mPresShellStates[mPresShellStates.Length() - 2].mInsidePointerEventsNoneDoc;
}
state->mInsidePointerEventsNoneDoc = pointerEventsNone;
if (!buildCaret)
return;
RefPtr<nsCaret> caret = state->mPresShell->GetCaret();
state->mCaretFrame = caret->GetPaintGeometry(&state->mCaretRect);
if (state->mCaretFrame) {
mFramesMarkedForDisplay.AppendElement(state->mCaretFrame);
MarkFrameForDisplay(state->mCaretFrame, nullptr);
}
nsPresContext* pc = aReferenceFrame->PresContext();
pc->GetDocShell()->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
mIsInChromePresContext = pc->IsChrome();
}
void
nsDisplayListBuilder::LeavePresShell(nsIFrame* aReferenceFrame)
{
NS_ASSERTION(CurrentPresShellState()->mPresShell ==
aReferenceFrame->PresContext()->PresShell(),
"Presshell mismatch");
ResetMarkedFramesForDisplayList();
mPresShellStates.SetLength(mPresShellStates.Length() - 1);
if (!mPresShellStates.IsEmpty()) {
nsPresContext* pc = CurrentPresContext();
pc->GetDocShell()->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
mIsInChromePresContext = pc->IsChrome();
}
}
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 (nsIFrame* e : aFrames) {
// Skip the AccessibleCaret frame when building no caret.
if (!IsBuildingCaret()) {
nsIContent* content = e->GetContent();
if (content && content->IsInNativeAnonymousSubtree() && content->IsElement()) {
auto classList = content->AsElement()->ClassList();
if (classList->Contains(NS_LITERAL_STRING("moz-accessiblecaret"))) {
continue;
}
}
}
mFramesMarkedForDisplay.AppendElement(e);
MarkOutOfFlowFrameForDisplay(aDirtyFrame, e, aDirtyRect);
}
}
/**
* Mark all preserve-3d children with
* NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO to make sure
* nsFrame::BuildDisplayListForChild() would visit them. Also compute
* dirty rect for preserve-3d children.
*
* @param aDirtyFrame is the frame to mark children extending context.
*/
void
nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(nsIFrame* aDirtyFrame)
{
AutoTArray<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->Combines3DTransformWithAncestors()) {
mFramesMarkedForDisplay.AppendElement(child);
MarkFrameForDisplay(child, aDirtyFrame);
}
}
}
}
void*
nsDisplayListBuilder::Allocate(size_t aSize)
{
void *tmp;
PL_ARENA_ALLOCATE(tmp, &mPool, aSize);
if (!tmp) {
NS_ABORT_OOM(aSize);
}
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;
}
DisplayItemScrollClip*
nsDisplayListBuilder::AllocateDisplayItemScrollClip(const DisplayItemScrollClip* aParent,
nsIScrollableFrame* aScrollableFrame,
const DisplayItemClip* aClip,
bool aIsAsyncScrollable)
{
void* p = Allocate(sizeof(DisplayItemScrollClip));
DisplayItemScrollClip* c =
new (p) DisplayItemScrollClip(aParent, aScrollableFrame, aClip, aIsAsyncScrollable);
mScrollClipsToDestroy.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;
}
// Sticky frames are active if their nearest scrollable frame is also active.
static bool
IsStickyFrameActive(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aParent)
{
MOZ_ASSERT(aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY);
// Find the nearest scrollframe.
nsIFrame* cursor = aFrame;
nsIFrame* parent = aParent;
if (!parent) {
parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
}
while (parent->GetType() != nsGkAtoms::scrollFrame) {
cursor = parent;
if ((parent = nsLayoutUtils::GetCrossDocParentFrame(cursor)) == nullptr) {
return false;
}
}
nsIScrollableFrame* sf = do_QueryFrame(parent);
return sf->IsScrollingActive(aBuilder) && sf->GetScrolledFrame() == cursor;
}
bool
nsDisplayListBuilder::IsAnimatedGeometryRoot(nsIFrame* aFrame, nsIFrame** aParent)
{
if (aFrame == mReferenceFrame) {
return true;
}
if (!IsPaintingToWindow()) {
if (aParent) {
*aParent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
}
return false;
}
if (nsLayoutUtils::IsPopup(aFrame))
return true;
if (ActiveLayerTracker::IsOffsetOrMarginStyleAnimated(aFrame)) {
const bool inBudget = AddToAGRBudget(aFrame);
if (inBudget) {
return true;
}
}
if (!aFrame->GetParent() &&
nsLayoutUtils::ViewportHasDisplayPort(aFrame->PresContext())) {
// Viewport frames in a display port need to be animated geometry roots
// for background-attachment:fixed elements.
return true;
}
if (aFrame->IsTransformed()) {
return true;
}
nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
if (!parent)
return true;
nsIAtom* parentType = parent->GetType();
// Treat the slider thumb as being as an active scrolled root when it wants
// its own layer so that it can move without repainting.
if (parentType == nsGkAtoms::sliderFrame && nsLayoutUtils::IsScrollbarThumbLayerized(aFrame)) {
return true;
}
if (aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY &&
IsStickyFrameActive(this, aFrame, parent))
{
return true;
}
if (parentType == nsGkAtoms::scrollFrame || parentType == nsGkAtoms::listControlFrame) {
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf->IsScrollingActive(this) && sf->GetScrolledFrame() == aFrame) {
return true;
}
}
// Fixed-pos frames are parented by the viewport frame, which has no parent.
if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(aFrame)) {
return true;
}
if (aParent) {
*aParent = parent;
}
return false;
}
nsIFrame*
nsDisplayListBuilder::FindAnimatedGeometryRootFrameFor(nsIFrame* aFrame)
{
MOZ_ASSERT(nsLayoutUtils::IsAncestorFrameCrossDoc(RootReferenceFrame(), aFrame));
nsIFrame* cursor = aFrame;
while (cursor != RootReferenceFrame()) {
nsIFrame* next;
if (IsAnimatedGeometryRoot(cursor, &next))
return cursor;
cursor = next;
}
return cursor;
}
void
nsDisplayListBuilder::RecomputeCurrentAnimatedGeometryRoot()
{
if (*mCurrentAGR != mCurrentFrame &&
IsAnimatedGeometryRoot(const_cast<nsIFrame*>(mCurrentFrame))) {
AnimatedGeometryRoot* oldAGR = mCurrentAGR;
mCurrentAGR = WrapAGRForFrame(const_cast<nsIFrame*>(mCurrentFrame), mCurrentAGR);
// Iterate the AGR cache and look for any objects that reference the old AGR and check
// to see if they need to be updated. AGRs can be in the cache multiple times, so we may
// end up doing the work multiple times for AGRs that don't change.
for (auto iter = mFrameToAnimatedGeometryRootMap.Iter(); !iter.Done(); iter.Next()) {
AnimatedGeometryRoot* cached = iter.UserData();
if (cached->mParentAGR == oldAGR && cached != mCurrentAGR) {
// It's possible that this cached AGR struct that has the old AGR as a parent
// should instead have mCurrentFrame has a parent.
nsIFrame* parent = FindAnimatedGeometryRootFrameFor(*cached);
MOZ_ASSERT(parent == mCurrentFrame || parent == *oldAGR);
if (parent == mCurrentFrame) {
cached->mParentAGR = mCurrentAGR;
}
}
}
}
}
void
nsDisplayListBuilder::AdjustWindowDraggingRegion(nsIFrame* aFrame)
{
if (!mWindowDraggingAllowed || !IsForPainting()) {
return;
}
const nsStyleUIReset* styleUI = aFrame->StyleUIReset();
if (styleUI->mWindowDragging == NS_STYLE_WINDOW_DRAGGING_DEFAULT) {
// This frame has the default value and doesn't influence the window
// dragging region.
return;
}
LayoutDeviceToLayoutDeviceMatrix4x4 referenceFrameToRootReferenceFrame;
// The const_cast is for nsLayoutUtils::GetTransformToAncestor.
nsIFrame* referenceFrame = const_cast<nsIFrame*>(FindReferenceFrameFor(aFrame));
if (IsInTransform()) {
// Only support 2d rectilinear transforms. Transform support is needed for
// the horizontal flip transform that's applied to the urlbar textbox in
// RTL mode - it should be able to exclude itself from the draggable region.
referenceFrameToRootReferenceFrame =
ViewAs<LayoutDeviceToLayoutDeviceMatrix4x4>(
nsLayoutUtils::GetTransformToAncestor(referenceFrame, mReferenceFrame));
Matrix referenceFrameToRootReferenceFrame2d;
if (!referenceFrameToRootReferenceFrame.Is2D(&referenceFrameToRootReferenceFrame2d) ||
!referenceFrameToRootReferenceFrame2d.IsRectilinear()) {
return;
}
} else {
MOZ_ASSERT(referenceFrame == mReferenceFrame,
"referenceFrameToRootReferenceFrame needs to be adjusted");
}
// 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()) {
LayoutDeviceRect devPixelBorderBox =
LayoutDevicePixel::FromAppUnits(borderBox, aFrame->PresContext()->AppUnitsPerDevPixel());
LayoutDeviceRect transformedDevPixelBorderBox =
TransformBy(referenceFrameToRootReferenceFrame, devPixelBorderBox);
transformedDevPixelBorderBox.Round();
LayoutDeviceIntRect transformedDevPixelBorderBoxInt;
if (transformedDevPixelBorderBox.ToIntRect(&transformedDevPixelBorderBoxInt)) {
if (styleUI->mWindowDragging == NS_STYLE_WINDOW_DRAGGING_DRAG) {
mWindowDraggingRegion.OrWith(transformedDevPixelBorderBoxInt);
} else {
mWindowNoDraggingRegion.OrWith(transformedDevPixelBorderBoxInt);
}
}
}
}
LayoutDeviceIntRegion
nsDisplayListBuilder::GetWindowDraggingRegion() const
{
LayoutDeviceIntRegion result;
result.Sub(mWindowDraggingRegion, mWindowNoDraggingRegion);;
return result;
}
const uint32_t gWillChangeAreaMultiplier = 3;
static uint32_t GetLayerizationCost(const nsSize& aSize) {
// There's significant overhead for each layer created from Gecko
// (IPC+Shared Objects) and from the backend (like an OpenGL texture).
// Therefore we set a minimum cost threshold of a 64x64 area.
int minBudgetCost = 64 * 64;
uint32_t budgetCost =
std::max(minBudgetCost,
nsPresContext::AppUnitsToIntCSSPixels(aSize.width) *
nsPresContext::AppUnitsToIntCSSPixels(aSize.height));
return budgetCost;
}
bool
nsDisplayListBuilder::AddToWillChangeBudget(nsIFrame* aFrame,
const nsSize& aSize) {
if (mWillChangeBudgetSet.Contains(aFrame)) {
return true; // Already accounted
}
nsPresContext* key = aFrame->PresContext();
if (!mWillChangeBudget.Contains(key)) {
mWillChangeBudget.Put(key, DocumentWillChangeBudget());
}
DocumentWillChangeBudget budget;
mWillChangeBudget.Get(key, &budget);
nsRect area = aFrame->PresContext()->GetVisibleArea();
uint32_t budgetLimit = nsPresContext::AppUnitsToIntCSSPixels(area.width) *
nsPresContext::AppUnitsToIntCSSPixels(area.height);
uint32_t cost = GetLayerizationCost(aSize);
bool onBudget = (budget.mBudget + cost) /
gWillChangeAreaMultiplier < budgetLimit;
if (onBudget) {
budget.mBudget += cost;
mWillChangeBudget.Put(key, budget);
mWillChangeBudgetSet.PutEntry(aFrame);
}
return onBudget;
}
bool
nsDisplayListBuilder::IsInWillChangeBudget(nsIFrame* aFrame,
const nsSize& aSize) {
bool onBudget = AddToWillChangeBudget(aFrame, aSize);
if (!onBudget) {
nsString usageStr;
usageStr.AppendInt(GetLayerizationCost(aSize));
nsString multiplierStr;
multiplierStr.AppendInt(gWillChangeAreaMultiplier);
nsString limitStr;
nsRect area = aFrame->PresContext()->GetVisibleArea();
uint32_t budgetLimit = nsPresContext::AppUnitsToIntCSSPixels(area.width) *
nsPresContext::AppUnitsToIntCSSPixels(area.height);
limitStr.AppendInt(budgetLimit);
const char16_t* params[] = { multiplierStr.get(), limitStr.get() };
aFrame->PresContext()->Document()->WarnOnceAbout(
nsIDocument::eIgnoringWillChangeOverBudget, false,
params, ArrayLength(params));
}
return onBudget;
}
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
const float gAGRBudgetAreaMultiplier = 0.3;
#else
const float gAGRBudgetAreaMultiplier = 3.0;
#endif
bool
nsDisplayListBuilder::AddToAGRBudget(nsIFrame* aFrame)
{
if (mAGRBudgetSet.Contains(aFrame)) {
return true;
}
const nsPresContext* presContext = aFrame->PresContext()->GetRootPresContext();
if (!presContext) {
return false;
}
const nsRect area = presContext->GetVisibleArea();
const uint32_t budgetLimit = gAGRBudgetAreaMultiplier *
nsPresContext::AppUnitsToIntCSSPixels(area.width) *
nsPresContext::AppUnitsToIntCSSPixels(area.height);
const uint32_t cost = GetLayerizationCost(aFrame->GetSize());
const bool onBudget = mUsedAGRBudget + cost < budgetLimit;
if (onBudget) {
mUsedAGRBudget += cost;
mAGRBudgetSet.PutEntry(aFrame);
}
return onBudget;
}
void
nsDisplayListBuilder::EnterSVGEffectsContents(nsDisplayList* aHoistedItemsStorage)
{
MOZ_ASSERT(mSVGEffectsBuildingDepth >= 0);
MOZ_ASSERT(aHoistedItemsStorage);
if (mSVGEffectsBuildingDepth == 0) {
MOZ_ASSERT(!mScrollInfoItemsForHoisting);
mScrollInfoItemsForHoisting = aHoistedItemsStorage;
}
mSVGEffectsBuildingDepth++;
}
void
nsDisplayListBuilder::ExitSVGEffectsContents()
{
mSVGEffectsBuildingDepth--;
MOZ_ASSERT(mSVGEffectsBuildingDepth >= 0);
MOZ_ASSERT(mScrollInfoItemsForHoisting);
if (mSVGEffectsBuildingDepth == 0) {
mScrollInfoItemsForHoisting = nullptr;
}
}
void
nsDisplayListBuilder::AppendNewScrollInfoItemForHoisting(nsDisplayScrollInfoLayer* aScrollInfoItem)
{
MOZ_ASSERT(ShouldBuildScrollInfoItemsForHoisting());
MOZ_ASSERT(mScrollInfoItemsForHoisting);
mScrollInfoItemsForHoisting->AppendNewToTop(aScrollInfoItem);
}
bool
nsDisplayListBuilder::IsBuildingLayerEventRegions()
{
if (IsPaintingToWindow()) {
// Note: this function and LayerEventRegionsEnabled are the only places
// that get to query LayoutEventRegionsEnabled 'directly' - other code
// should call this function.
return gfxPrefs::LayoutEventRegionsEnabledDoNotUseDirectly() ||
mAsyncPanZoomEnabled;
}
return false;
}
/* static */ bool
nsDisplayListBuilder::LayerEventRegionsEnabled()
{
// Note: this function and IsBuildingLayerEventRegions are the only places
// that get to query LayoutEventRegionsEnabled 'directly' - other code
// should call this function.
return gfxPrefs::LayoutEventRegionsEnabledDoNotUseDirectly() ||
gfxPlatform::AsyncPanZoomEnabled();
}
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::GetScrollClippedBoundsUpTo(nsDisplayListBuilder* aBuilder,
const DisplayItemScrollClip* aIncludeScrollClipsUpTo) const {
nsRect bounds;
for (nsDisplayItem* i = GetBottom(); i != nullptr; i = i->GetAbove()) {
nsRect r = i->GetClippedBounds(aBuilder);
if (r.IsEmpty()) {
continue;
}
for (auto* sc = i->ScrollClip(); sc && sc != aIncludeScrollClipsUpTo; sc = sc->mParent) {
if (sc->mClip && sc->mClip->HasClip()) {
if (sc->mIsAsyncScrollable) {
// Assume the item can move anywhere in the scroll clip's clip rect.
r = sc->mClip->GetClipRect();
} else {
r = sc->mClip->ApplyNonRoundedIntersection(r);
}
}
}
bounds.UnionRect(bounds, r);
}
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) {
PROFILER_LABEL("nsDisplayList", "ComputeVisibilityForRoot",
js::ProfileEntry::Category::GRAPHICS);
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
return ComputeVisibilityForSublist(aBuilder, aVisibleRegion, r.GetBounds());
}
static nsRegion
TreatAsOpaque(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder)
{
bool snap;
nsRegion opaque = aItem->GetOpaqueRegion(aBuilder, &snap);
if (aBuilder->IsForPluginGeometry() &&
aItem->GetType() != nsDisplayItem::TYPE_LAYER_EVENT_REGIONS)
{
// 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->StyleEffects()->mOpacity != 0.0) {
opaque = aItem->GetBounds(aBuilder, &snap);
}
}
if (opaque.IsEmpty()) {
return opaque;
}
nsRegion opaqueClipped;
for (auto iter = opaque.RectIter(); !iter.Done(); iter.Next()) {
opaqueClipped.Or(opaqueClipped,
aItem->GetClip().ApproximateIntersectInward(iter.Get()));
}
return opaqueClipped;
}
bool
nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aListVisibleBounds)
{
#ifdef DEBUG
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
NS_ASSERTION(r.GetBounds().IsEqualInterior(aListVisibleBounds),
"bad aListVisibleBounds");
#endif
bool anyVisible = false;
AutoTArray<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;
}
static bool
TriggerPendingAnimationsOnSubDocuments(nsIDocument* aDocument, void* aReadyTime)
{
PendingAnimationTracker* tracker = aDocument->GetPendingAnimationTracker();
if (tracker) {
nsIPresShell* shell = aDocument->GetShell();
// If paint-suppression is in effect then we haven't finished painting
// this document yet so we shouldn't start animations
if (!shell || !shell->IsPaintingSuppressed()) {
const TimeStamp& readyTime = *static_cast<TimeStamp*>(aReadyTime);
tracker->TriggerPendingAnimationsOnNextTick(readyTime);
}
}
aDocument->EnumerateSubDocuments(TriggerPendingAnimationsOnSubDocuments,
aReadyTime);
return true;
}
static void
TriggerPendingAnimations(nsIDocument* aDocument,
const TimeStamp& aReadyTime) {
MOZ_ASSERT(!aReadyTime.IsNull(),
"Animation ready time is not set. Perhaps we're using a layer"
" manager that doesn't update it");
TriggerPendingAnimationsOnSubDocuments(aDocument,
const_cast<TimeStamp*>(&aReadyTime));
}
LayerManager*
nsDisplayListBuilder::GetWidgetLayerManager(nsView** aView, bool* aAllowRetaining)
{
nsView* view = RootReferenceFrame()->GetView();
if (aView) {
*aView = view;
}
if (RootReferenceFrame() != nsLayoutUtils::GetDisplayRootFrame(RootReferenceFrame())) {
return nullptr;
}
nsIWidget* window = RootReferenceFrame()->GetNearestWidget();
if (window) {
return window->GetLayerManager(aAllowRetaining);
}
return nullptr;
}
/**
* 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.
*/
already_AddRefed<LayerManager> nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
uint32_t aFlags) {
PROFILER_LABEL("nsDisplayList", "PaintRoot",
js::ProfileEntry::Category::GRAPHICS);
RefPtr<LayerManager> layerManager;
bool widgetTransaction = false;
bool allowRetaining = false;
bool doBeginTransaction = true;
nsView *view = nullptr;
if (aFlags & PAINT_USE_WIDGET_LAYERS) {
layerManager = aBuilder->GetWidgetLayerManager(&view, &allowRetaining);
if (layerManager) {
doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION);
widgetTransaction = true;
}
}
if (!layerManager) {
if (!aCtx) {
NS_WARNING("Nowhere to paint into");
return nullptr;
}
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 (doBeginTransaction) {
if (aCtx) {
layerManager->BeginTransactionWithTarget(aCtx->ThebesContext());
} else {
layerManager->BeginTransaction();
}
}
if (widgetTransaction) {
layerBuilder->DidBeginRetainedLayerTransaction(layerManager);
}
nsIFrame* frame = aBuilder->RootReferenceFrame();
nsPresContext* presContext = frame->PresContext();
nsIPresShell* presShell = presContext->GetPresShell();
nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
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()));
}
// Clear any ScrollMetadata that may have been set on the root layer on a
// previous paint. This paint will set new metrics if necessary, and if we
// don't clear the old one here, we may be left with extra metrics.
if (Layer* root = layerManager->GetRoot()) {
root->SetScrollMetadata(nsTArray<ScrollMetadata>());
}
ContainerLayerParameters containerParameters
(presShell->GetResolution(), presShell->GetResolution());
RefPtr<ContainerLayer> root = layerBuilder->
BuildContainerLayerFor(aBuilder, layerManager, frame, nullptr, this,
containerParameters, nullptr);
nsIDocument* document = nullptr;
if (presShell) {
document = presShell->GetDocument();
}
if (!root) {
layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder);
return nullptr;
}
// Root is being scaled up by the X/Y resolution. Scale it back down.
root->SetPostScale(1.0f/containerParameters.mXScale,
1.0f/containerParameters.mYScale);
root->SetScaleToResolution(presShell->ScaleToResolution(),
containerParameters.mXScale);
if (aBuilder->IsBuildingLayerEventRegions() &&
nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(presShell)) {
root->SetEventRegionsOverride(EventRegionsOverride::ForceDispatchToContent);
} else {
root->SetEventRegionsOverride(EventRegionsOverride::NoOverride);
}
// If we're using containerless scrolling, there is still one case where we
// want the root container layer to have metrics. If the parent process is
// using XUL windows, there is no root scrollframe, and without explicitly
// creating metrics there will be no guaranteed top-level APZC.
bool addMetrics = gfxPrefs::LayoutUseContainersForRootFrames() ||
(XRE_IsParentProcess() && !presShell->GetRootScrollFrame());
// Add metrics if there are none in the layer tree with the id (create an id
// if there isn't one already) of the root scroll frame/root content.
bool ensureMetricsForRootId =
nsLayoutUtils::AsyncPanZoomEnabled(frame) &&
!gfxPrefs::LayoutUseContainersForRootFrames() &&
aBuilder->IsPaintingToWindow() &&
!presContext->GetParentPresContext();
nsIContent* content = nullptr;
nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
if (rootScrollFrame) {
content = rootScrollFrame->GetContent();
} else {
// If there is no root scroll frame, pick the document element instead.
// The only case we don't want to do this is in non-APZ fennec, where
// we want the root xul document to get a null scroll id so that the root
// content document gets the first non-null scroll id.
#if !defined(MOZ_WIDGET_ANDROID) || defined(MOZ_ANDROID_APZ)
content = document->GetDocumentElement();
#endif
}
if (ensureMetricsForRootId && content) {
ViewID scrollId = nsLayoutUtils::FindOrCreateIDFor(content);
if (nsLayoutUtils::ContainsMetricsWithId(root, scrollId)) {
ensureMetricsForRootId = false;
}
}
if (addMetrics || ensureMetricsForRootId) {
bool isRootContent = presContext->IsRootContentDocument();
nsRect viewport(aBuilder->ToReferenceFrame(frame), frame->GetSize());
root->SetScrollMetadata(
nsLayoutUtils::ComputeScrollMetadata(frame,
rootScrollFrame, content,
aBuilder->FindReferenceFrameFor(frame),
root, FrameMetrics::NULL_SCROLL_ID, viewport, Nothing(),
isRootContent, containerParameters));
}
// NS_WARNING is debug-only, so don't even bother checking the conditions in
// a release build.
#ifdef DEBUG
bool usingDisplayport = false;
if (nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame()) {
nsIContent* content = rootScrollFrame->GetContent();
if (content) {
usingDisplayport = nsLayoutUtils::HasDisplayPort(content);
}
}
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())) {
frame->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;
}
}
// If this is the content process, we ship plugin geometry updates over with layer
// updates, so calculate that now before we call EndTransaction.
if (rootPresContext && XRE_IsContentProcess()) {
if (aBuilder->WillComputePluginGeometry()) {
rootPresContext->ComputePluginGeometryUpdates(aBuilder->RootReferenceFrame(), aBuilder, this);
}
// The layer system caches plugin configuration information for forwarding
// with layer updates which needs to get set during reflow. This must be
// called even if there are no windowed plugins in the page.
rootPresContext->CollectPluginGeometryUpdates(layerManager);
}
MaybeSetupTransactionIdAllocator(layerManager, view);
layerManager->EndTransaction(FrameLayerBuilder::DrawPaintedLayer,
aBuilder, flags);
aBuilder->SetIsCompositingCheap(temp);
layerBuilder->DidEndTransaction();
if (document && widgetTransaction) {
TriggerPendingAnimations(document, layerManager->GetAnimationReadyTime());
}
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);
}
}
layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder);
return layerManager.forget();
}
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->IsXULBoxFrame())
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::GetParentXULBox(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->StyleUserInterface()->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 (!FuzzyEqual(mDepth, aOther.mDepth, 0.1f)) {
// 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->AppendElements(Move(aSource[i].mFrames));
}
aSource.Clear();
}
void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames) const {
nsDisplayItem* item;
if (aState->mInPreserves3D) {
// Collect leaves of the current 3D rendering context.
for (item = GetBottom(); item; item = item->GetAbove()) {
auto itemType = item->GetType();
if (itemType != nsDisplayItem::TYPE_TRANSFORM ||
!static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
item->HitTest(aBuilder, aRect, aState, aOutFrames);
} else {
// One of leaves in the current 3D rendering context.
aState->mItemBuffer.AppendElement(item);
}
}
return;
}
int32_t itemBufferStart = aState->mItemBuffer.Length();
for (item = GetBottom(); item; item = item->GetAbove()) {
aState->mItemBuffer.AppendElement(item);
}
AutoTArray<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);
auto itemType = item->GetType();
bool same3DContext =
(itemType == nsDisplayItem::TYPE_TRANSFORM &&
static_cast<nsDisplayTransform*>(item)->IsParticipating3DContext()) ||
((itemType == nsDisplayItem::TYPE_PERSPECTIVE ||
itemType == nsDisplayItem::TYPE_OPACITY) &&
static_cast<nsDisplayPerspective*>(item)->Frame()->Extend3DContext());
if (same3DContext &&
!static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
if (!item->GetClip().MayIntersect(aRect)) {
continue;
}
AutoTArray<nsIFrame*, 1> neverUsed;
// Start gethering leaves of the 3D rendering context, and
// append leaves at the end of mItemBuffer. Leaves are
// processed at following iterations.
aState->mInPreserves3D = true;
item->HitTest(aBuilder, aRect, aState, &neverUsed);
aState->mInPreserves3D = false;
i = aState->mItemBuffer.Length();
continue;
}
if (same3DContext || item->GetClip().MayIntersect(r)) {
AutoTArray<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 &&
static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
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) {
{
// TEMPORARY debugging code for bug 1265280
nsIFrame* f2 = aItem2->Frame();
if (uintptr_t(f2->StyleContext()) == mozPoisonValue()) {
NS_RUNTIMEABORT(nsPrintfCString("bad display item %p type %s frame %p",
aItem2, aItem2->Name(), f2).get());
}
}
// 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() {
Sort(IsZOrderLEQ, nullptr);
}
void nsDisplayList::SortByContentOrder(nsIContent* aCommonAncestor) {
Sort(IsContentLEQ, aCommonAncestor);
}
void nsDisplayList::Sort(SortLEQ aCmp, void* aClosure) {
::Sort(this, Count(), aCmp, aClosure);
}
nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame, aBuilder->ClipState().GetCurrentInnermostScrollClip())
{}
nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const DisplayItemScrollClip* aScrollClip)
: mFrame(aFrame)
, mClip(aBuilder->ClipState().GetCurrentCombinedClip(aBuilder))
, mScrollClip(aScrollClip)
, mAnimatedGeometryRoot(nullptr)
#ifdef MOZ_DUMP_PAINTING
, mPainted(false)
#endif
{
mReferenceFrame = aBuilder->FindReferenceFrameFor(aFrame, &mToReferenceFrame);
// This can return the wrong result if the item override ShouldFixToViewport(),
// the item needs to set it again in its constructor.
mAnimatedGeometryRoot = aBuilder->FindAnimatedGeometryRootFor(aFrame);
MOZ_ASSERT(nsLayoutUtils::IsAncestorFrameCrossDoc(aBuilder->RootReferenceFrame(),
*mAnimatedGeometryRoot), "Bad");
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();
}
/* 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 ZIndexForFrame(nsIFrame* aFrame)
{
if (!aFrame->IsAbsPosContaininingBlock() && !aFrame->IsFlexOrGridItem())
return 0;
const nsStylePosition* position = aFrame->StylePosition();
if (position->mZIndex.GetUnit() == eStyleUnit_Integer)
return position->mZIndex.GetIntValue();
// sort the auto and 0 elements together
return 0;
}
int32_t
nsDisplayItem::ZIndex() const
{
return ZIndexForFrame(mFrame);
}
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)
{
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
DrawTarget* drawTarget = aCtx->GetDrawTarget();
Rect rect =
NSRectToSnappedRect(mVisibleRect, appUnitsPerDevPixel, *drawTarget);
drawTarget->FillRect(rect, ColorPattern(ToDeviceColor(mColor)));
}
void
nsDisplaySolidColor::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (rgba "
<< (int)NS_GET_R(mColor) << ","
<< (int)NS_GET_G(mColor) << ","
<< (int)NS_GET_B(mColor) << ","
<< (int)NS_GET_A(mColor) << ")";
}
static void
RegisterThemeGeometry(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsITheme::ThemeGeometryType aType)
{
if (aBuilder->IsInRootChromeDocumentOrPopup() && !aBuilder->IsInTransform()) {
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
nsRect borderBox(aFrame->GetOffsetTo(displayRoot), aFrame->GetSize());
aBuilder->RegisterThemeGeometry(aType,
LayoutDeviceIntRect::FromUnknownRect(
borderBox.ToNearestPixels(
aFrame->PresContext()->AppUnitsPerDevPixel())));
}
}
nsDisplayBackgroundImage::nsDisplayBackgroundImage(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
uint32_t aLayer,
const nsRect& aBackgroundRect,
const nsStyleBackground* aBackgroundStyle)
: nsDisplayImageContainer(aBuilder, aFrame)
, mBackgroundStyle(aBackgroundStyle)
, mBackgroundRect(aBackgroundRect)
, mLayer(aLayer)
, mIsRasterImage(false)
{
MOZ_COUNT_CTOR(nsDisplayBackgroundImage);
nsPresContext* presContext = mFrame->PresContext();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
const nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.mLayers[mLayer];
bool isTransformedFixed;
nsBackgroundLayerState state =
nsCSSRendering::PrepareImageLayer(presContext, mFrame, flags,
mBackgroundRect, mBackgroundRect, layer,
&isTransformedFixed);
mShouldTreatAsFixed = ComputeShouldTreatAsFixed(isTransformedFixed);
mBounds = GetBoundsInternal(aBuilder);
if (ShouldFixToViewport(aBuilder)) {
mAnimatedGeometryRoot = aBuilder->FindAnimatedGeometryRootFor(this);
}
mFillRect = state.mFillArea;
mDestRect = state.mDestArea;
nsImageRenderer* imageRenderer = &state.mImageRenderer;
// We only care about images here, not gradients.
if (imageRenderer->IsRasterImage()) {
mIsRasterImage = true;
mImage = imageRenderer->GetImage();
}
}
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 nsStyleImageLayers::Layer& aLayer,
const nsRect& aBackgroundRect,
bool aWillPaintBorder)
{
nsCSSRendering::ImageLayerClipState clip;
nsCSSRendering::GetImageLayerClip(aLayer, aFrame, *aFrame->StyleBorder(),
aBackgroundRect, aBackgroundRect, 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,
const nsRect& aBackgroundRect,
nsDisplayList* aList,
bool aAllowWillPaintBorderOptimization)
{
if (aBuilder->IsForGenerateGlyphMask() ||
aBuilder->IsForPaintingSelectionBG()) {
return true;
}
nsStyleContext* bgSC = nullptr;
const nsStyleBackground* bg = nullptr;
nsRect bgRect = aBackgroundRect + aBuilder->ToReferenceFrame(aFrame);
nsPresContext* presContext = aFrame->PresContext();
bool isThemed = aFrame->IsThemed();
if (!isThemed) {
bgSC = GetBackgroundStyleContext(aFrame);
if (bgSC) {
bg = bgSC->StyleBackground();
}
}
bool drawBackgroundColor = false;
// Dummy initialisation to keep Valgrind/Memcheck happy.
// See bug 1122375 comment 1.
nscolor color = NS_RGBA(0,0,0,0);
if (!nsCSSRendering::IsCanvasFrame(aFrame) && bg) {
bool drawBackgroundImage;
color =
nsCSSRendering::DetermineBackgroundColor(presContext, bgSC, aFrame,
drawBackgroundImage, drawBackgroundColor);
}
const nsStyleBorder* borderStyle = aFrame->StyleBorder();
const nsStyleEffects* effectsStyle = aFrame->StyleEffects();
bool hasInsetShadow = effectsStyle->mBoxShadow &&
effectsStyle->mBoxShadow->HasShadowWithInset(true);
bool willPaintBorder = aAllowWillPaintBorderOptimization &&
!isThemed && !hasInsetShadow &&
borderStyle->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()) {
// Disable the will-paint-border optimization for background
// colors with no border-radius. Enabling it for background colors
// doesn't help much (there are no tiling issues) and clipping the
// background breaks detection of the element's border-box being
// opaque. For nonzero border-radius we still need it because we
// want to inset the background if possible to avoid antialiasing
// artifacts along the rounded corners.
bool useWillPaintBorderOptimization = willPaintBorder &&
nsLayoutUtils::HasNonZeroCorner(borderStyle->mBorderRadius);
SetBackgroundClipRegion(clipState, aFrame, toRef,
bg->BottomLayer(), bgRect,
useWillPaintBorderOptimization);
}
bgItemList.AppendNewToTop(
new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bgRect, bg,
drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0)));
}
if (isThemed) {
nsITheme* theme = presContext->GetTheme();
if (theme->NeedToClearBackgroundBehindWidget(aFrame, aFrame->StyleDisplay()->mAppearance) &&
aBuilder->IsInRootChromeDocumentOrPopup() && !aBuilder->IsInTransform()) {
bgItemList.AppendNewToTop(
new (aBuilder) nsDisplayClearBackground(aBuilder, aFrame));
}
nsDisplayThemedBackground* bgItem =
new (aBuilder) nsDisplayThemedBackground(aBuilder, aFrame, bgRect);
bgItemList.AppendNewToTop(bgItem);
aList->AppendToTop(&bgItemList);
return true;
}
if (!bg) {
aList->AppendToTop(&bgItemList);
return false;
}
const DisplayItemScrollClip* scrollClip =
aBuilder->ClipState().GetCurrentInnermostScrollClip();
bool needBlendContainer = false;
// Passing bg == nullptr in this macro will result in one iteration with
// i = 0.
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, bg->mImage) {
if (bg->mImage.mLayers[i].mImage.IsEmpty()) {
continue;
}
if (bg->mImage.mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) {
needBlendContainer = true;
}
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (!aBuilder->IsForEventDelivery()) {
const nsStyleImageLayers::Layer& layer = bg->mImage.mLayers[i];
SetBackgroundClipRegion(clipState, aFrame, toRef,
layer, bgRect, willPaintBorder);
}
nsDisplayList thisItemList;
nsDisplayBackgroundImage* bgItem =
new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bgRect, bg);
if (bgItem->ShouldFixToViewport(aBuilder)) {
thisItemList.AppendNewToTop(
nsDisplayFixedPosition::CreateForFixedBackground(aBuilder, aFrame, bgItem, i));
} else {
thisItemList.AppendNewToTop(bgItem);
}
if (bg->mImage.mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) {
thisItemList.AppendNewToTop(
new (aBuilder) nsDisplayBlendMode(aBuilder, aFrame, &thisItemList,
bg->mImage.mLayers[i].mBlendMode,
scrollClip, i + 1));
}
bgItemList.AppendToTop(&thisItemList);
}
if (needBlendContainer) {
bgItemList.AppendNewToTop(
nsDisplayBlendContainer::CreateForBackgroundBlendMode(aBuilder, aFrame, &bgItemList, scrollClip));
}
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::ShouldTreatAsFixed() const
{
return mShouldTreatAsFixed;
}
bool
nsDisplayBackgroundImage::ComputeShouldTreatAsFixed(bool isTransformedFixed) const
{
if (!mBackgroundStyle)
return false;
const nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.mLayers[mLayer];
if (layer.mAttachment != NS_STYLE_IMAGELAYER_ATTACHMENT_FIXED)
return false;
// background-attachment:fixed is treated as background-attachment:scroll
// if it's affected by a transform.
// See https://www.w3.org/Bugs/Public/show_bug.cgi?id=17521.
return !isTransformedFixed;
}
bool
nsDisplayBackgroundImage::IsNonEmptyFixedImage() const
{
return ShouldTreatAsFixed() &&
!mBackgroundStyle->mImage.mLayers[mLayer].mImage.IsEmpty();
}
bool
nsDisplayBackgroundImage::ShouldFixToViewport(nsDisplayListBuilder* aBuilder)
{
// APZ needs background-attachment:fixed images layerized for correctness.
RefPtr<LayerManager> layerManager = aBuilder->GetWidgetLayerManager();
if (!nsLayoutUtils::UsesAsyncScrolling(mFrame) &&
layerManager && layerManager->ShouldAvoidComponentAlphaLayers()) {
return false;
}
// Put background-attachment:fixed background images in their own
// compositing layer.
return IsNonEmptyFixedImage();
}
bool
nsDisplayBackgroundImage::CanOptimizeToImageLayer(LayerManager* aManager,
nsDisplayListBuilder* aBuilder)
{
if (!mBackgroundStyle) {
return false;
}
// We currently can't handle tiled backgrounds.
if (!mDestRect.Contains(mFillRect)) {
return false;
}
// For 'contain' and 'cover', we allow any pixel of the image to be sampled
// because there isn't going to be any spriting/atlasing going on.
const nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.mLayers[mLayer];
bool allowPartialImages =
(layer.mSize.mWidthType == nsStyleImageLayers::Size::eContain ||
layer.mSize.mWidthType == nsStyleImageLayers::Size::eCover);
if (!allowPartialImages && !mFillRect.Contains(mDestRect)) {
return false;
}
return nsDisplayImageContainer::CanOptimizeToImageLayer(aManager, aBuilder);
}
nsRect
nsDisplayBackgroundImage::GetDestRect()
{
return mDestRect;
}
already_AddRefed<imgIContainer>
nsDisplayBackgroundImage::GetImage()
{
nsCOMPtr<imgIContainer> image = mImage;
return image.forget();
}
nsDisplayBackgroundImage::ImageLayerization
nsDisplayBackgroundImage::ShouldCreateOwnLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager)
{
nsIFrame* backgroundStyleFrame = nsCSSRendering::FindBackgroundStyleFrame(mFrame);
if (ActiveLayerTracker::IsBackgroundPositionAnimated(aBuilder,
backgroundStyleFrame)) {
return WHENEVER_POSSIBLE;
}
if (nsLayoutUtils::AnimatedImageLayersEnabled() && mBackgroundStyle) {
const nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.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) {
bool animated = false;
if (NS_SUCCEEDED(image->GetAnimated(&animated)) && animated) {
return WHENEVER_POSSIBLE;
}
}
}
}
if (nsLayoutUtils::GPUImageScalingEnabled() &&
aManager->IsCompositingCheap()) {
return ONLY_FOR_SCALING;
}
return NO_LAYER_NEEDED;
}
LayerState
nsDisplayBackgroundImage::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
ImageLayerization shouldLayerize = ShouldCreateOwnLayer(aBuilder, aManager);
if (shouldLayerize == NO_LAYER_NEEDED) {
// We can skip the call to CanOptimizeToImageLayer if we don't want a
// layer anyway.
return LAYER_NONE;
}
if (CanOptimizeToImageLayer(aManager, aBuilder)) {
if (shouldLayerize == WHENEVER_POSSIBLE) {
return LAYER_ACTIVE;
}
MOZ_ASSERT(shouldLayerize == ONLY_FOR_SCALING, "unhandled ImageLayerization value?");
MOZ_ASSERT(mImage);
int32_t imageWidth;
int32_t imageHeight;
mImage->GetWidth(&imageWidth);
mImage->GetHeight(&imageHeight);
NS_ASSERTION(imageWidth != 0 && imageHeight != 0, "Invalid image size!");
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
LayoutDeviceRect destRect = LayoutDeviceRect::FromAppUnits(GetDestRect(), appUnitsPerDevPixel);
const LayerRect destLayerRect = destRect * aParameters.Scale();
// Calculate the scaling factor for the frame.
const gfxSize scale = gfxSize(destLayerRect.width / imageWidth,
destLayerRect.height / imageHeight);
if ((scale.width != 1.0f || scale.height != 1.0f) &&
(destLayerRect.width * destLayerRect.height >= 64 * 64)) {
// Separate this image into a layer.
// There's no point in doing this if we are not scaling at all or if the
// target size is pretty small.
return LAYER_ACTIVE;
}
}
return LAYER_NONE;
}
already_AddRefed<Layer>
nsDisplayBackgroundImage::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
RefPtr<ImageLayer> layer = static_cast<ImageLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateImageLayer();
if (!layer)
return nullptr;
}
RefPtr<ImageContainer> imageContainer = GetContainer(aManager, aBuilder);
layer->SetContainer(imageContainer);
ConfigureLayer(layer, aParameters);
return layer.forget();
}
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,
uint8_t aClip,
const nsRect& aRect,
const nsRect& aBackgroundRect)
{
nsRegion result;
if (aRect.IsEmpty())
return result;
nsIFrame *frame = aItem->Frame();
nsRect clipRect = aBackgroundRect;
if (frame->GetType() == nsGkAtoms::canvasFrame) {
nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
clipRect = canvasFrame->CanvasArea() + aItem->ToReferenceFrame();
} else if (aClip == NS_STYLE_IMAGELAYER_CLIP_PADDING ||
aClip == NS_STYLE_IMAGELAYER_CLIP_CONTENT) {
nsMargin border = frame->GetUsedBorder();
if (aClip == NS_STYLE_IMAGELAYER_CLIP_CONTENT) {
border += frame->GetUsedPadding();
}
border.ApplySkipSides(frame->GetSkipSides());
clipRect.Deflate(border);
}
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 nsStyleImageLayers::Layer& layer = mBackgroundStyle->mImage.mLayers[mLayer];
if (layer.mImage.IsOpaque() && layer.mBlendMode == NS_STYLE_BLEND_NORMAL &&
layer.mClip != NS_STYLE_IMAGELAYER_CLIP_TEXT) {
result = GetInsideClipRegion(this, layer.mClip, mBounds, mBackgroundRect);
}
}
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;
bool transformedFixed;
return nsCSSRendering::ComputeImageLayerPositioningArea(
mFrame->PresContext(), mFrame,
mBackgroundRect,
mBackgroundStyle->mImage.mLayers[mLayer],
&attachedToFrame,
&transformedFixed) + 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 nsStyleImageLayers::Layer &layer = mBackgroundStyle->mImage.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) {
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
CheckForBorderItem(this, flags);
gfxContext* ctx = aCtx->ThebesContext();
uint8_t clip = mBackgroundStyle->mImage.mLayers[mLayer].mClip;
if (clip == NS_STYLE_IMAGELAYER_CLIP_TEXT) {
GenerateAndPushTextMask(mFrame, aCtx, mBackgroundRect);
}
image::DrawResult result =
nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame,
aBounds,
mBackgroundRect,
flags, aClipRect, mLayer,
CompositionOp::OP_OVER);
if (clip == NS_STYLE_IMAGELAYER_CLIP_TEXT) {
ctx->PopGroupAndBlend();
}
nsDisplayBackgroundGeometry::UpdateDrawResult(this, result);
}
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 (!mDestRect.IsEqualInterior(geometry->mDestRect)) {
// Dest 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);
NotifyRenderingChanged();
return;
}
if (aBuilder->ShouldSyncDecodeImages()) {
const nsStyleImage& image = mBackgroundStyle->mImage.mLayers[mLayer].mImage;
if (image.GetType() == eStyleImageType_Image &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
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 clipRect = mBackgroundRect;
if (mFrame->GetType() == nsGkAtoms::canvasFrame) {
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
clipRect = frame->CanvasArea() + ToReferenceFrame();
} else if (nsLayoutUtils::UsesAsyncScrolling(mFrame) && IsNonEmptyFixedImage()) {
// If this is a background-attachment:fixed image, and APZ is enabled,
// async scrolling could reveal additional areas of the image, so don't
// clip it beyond clipping to the document's viewport.
nsIFrame* rootFrame = presContext->PresShell()->GetRootFrame();
nsRect rootRect = rootFrame->GetRectRelativeToSelf();
if (nsLayoutUtils::TransformRect(rootFrame, mFrame, rootRect) == nsLayoutUtils::TRANSFORM_SUCCEEDED) {
clipRect = clipRect.Union(rootRect + aBuilder->ToReferenceFrame(mFrame));
}
}
const nsStyleImageLayers::Layer& layer = mBackgroundStyle->mImage.mLayers[mLayer];
return nsCSSRendering::GetBackgroundLayerRect(presContext, mFrame,
mBackgroundRect, clipRect, layer,
aBuilder->GetBackgroundPaintFlags());
}
uint32_t
nsDisplayBackgroundImage::GetPerFrameKey()
{
return (mLayer << nsDisplayItem::TYPE_BITS) |
nsDisplayItem::GetPerFrameKey();
}
nsDisplayThemedBackground::nsDisplayThemedBackground(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
const nsRect& aBackgroundRect)
: nsDisplayItem(aBuilder, aFrame)
, mBackgroundRect(aBackgroundRect)
{
MOZ_COUNT_CTOR(nsDisplayThemedBackground);
const nsStyleDisplay* disp = mFrame->StyleDisplay();
mAppearance = disp->mAppearance;
mFrame->IsThemed(disp, &mThemeTransparency);
// Perform necessary RegisterThemeGeometry
nsITheme* theme = mFrame->PresContext()->GetTheme();
nsITheme::ThemeGeometryType type =
theme->ThemeGeometryTypeForWidget(mFrame, disp->mAppearance);
if (type != nsITheme::eThemeGeometryTypeUnknown) {
RegisterThemeGeometry(aBuilder, aFrame, type);
}
if (disp->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
disp->mAppearance == NS_THEME_WIN_GLASS) {
aBuilder->SetGlassDisplayItem(this);
}
mBounds = GetBoundsInternal();
}
nsDisplayThemedBackground::~nsDisplayThemedBackground()
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_DTOR(nsDisplayThemedBackground);
#endif
}
void
nsDisplayThemedBackground::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (themed, appearance:" << (int)mAppearance << ")";
}
void
nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
// Assume that any point in our background rect is a hit.
if (mBackgroundRect.Intersects(aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
nsRegion
nsDisplayThemedBackground::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
nsRegion result;
*aSnap = false;
if (mThemeTransparency == nsITheme::eOpaque) {
result = mBackgroundRect;
}
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;
}
bool
nsDisplayThemedBackground::ProvidesFontSmoothingBackgroundColor(nscolor* aColor)
{
nsITheme* theme = mFrame->PresContext()->GetTheme();
return theme->WidgetProvidesFontSmoothingBackgroundColor(mFrame, mAppearance, aColor);
}
nsRect
nsDisplayThemedBackground::GetPositioningArea()
{
return mBackgroundRect;
}
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 drawing(mBackgroundRect);
theme->GetWidgetOverflow(presContext->DeviceContext(), mFrame, mAppearance,
&drawing);
drawing.IntersectRect(drawing, aBounds);
theme->DrawWidgetBackground(aCtx, mFrame, mAppearance, mBackgroundRect, 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 = mBackgroundRect - ToReferenceFrame();
presContext->GetTheme()->
GetWidgetOverflow(presContext->DeviceContext(), mFrame,
mFrame->StyleDisplay()->mAppearance, &r);
return r + ToReferenceFrame();
}
void
nsDisplayImageContainer::ConfigureLayer(ImageLayer* aLayer,
const ContainerLayerParameters& aParameters)
{
aLayer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(mFrame));
nsCOMPtr<imgIContainer> image = GetImage();
MOZ_ASSERT(image);
int32_t imageWidth;
int32_t imageHeight;
image->GetWidth(&imageWidth);
image->GetHeight(&imageHeight);
NS_ASSERTION(imageWidth != 0 && imageHeight != 0, "Invalid image size!");
if (imageWidth > 0 && imageHeight > 0) {
// We're actually using the ImageContainer. Let our frame know that it
// should consider itself to have painted successfully.
nsDisplayBackgroundGeometry::UpdateDrawResult(this,
image::DrawResult::SUCCESS);
}
// XXX(seth): Right now we ignore aParameters.Scale() and
// aParameters.Offset(), because FrameLayerBuilder already applies
// aParameters.Scale() via the layer's post-transform, and
// aParameters.Offset() is always zero.
MOZ_ASSERT(aParameters.Offset() == LayerIntPoint(0,0));
// It's possible (for example, due to downscale-during-decode) that the
// ImageContainer this ImageLayer is holding has a different size from the
// intrinsic size of the image. For this reason we compute the transform using
// the ImageContainer's size rather than the image's intrinsic size.
// XXX(seth): In reality, since the size of the ImageContainer may change
// asynchronously, this is not enough. Bug 1183378 will provide a more
// complete fix, but this solution is safe in more cases than simply relying
// on the intrinsic size.
IntSize containerSize = aLayer->GetContainer()
? aLayer->GetContainer()->GetCurrentSize()
: IntSize(imageWidth, imageHeight);
const int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel();
const LayoutDeviceRect destRect =
LayoutDeviceRect::FromAppUnits(GetDestRect(), factor);
const LayoutDevicePoint p = destRect.TopLeft();
Matrix transform = Matrix::Translation(p.x, p.y);
transform.PreScale(destRect.width / containerSize.width,
destRect.height / containerSize.height);
aLayer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
}
already_AddRefed<ImageContainer>
nsDisplayImageContainer::GetContainer(LayerManager* aManager,
nsDisplayListBuilder *aBuilder)
{
nsCOMPtr<imgIContainer> image = GetImage();
if (!image) {
MOZ_ASSERT_UNREACHABLE("Must call CanOptimizeToImage() and get true "
"before calling GetContainer()");
return nullptr;
}
uint32_t flags = aBuilder->ShouldSyncDecodeImages()
? imgIContainer::FLAG_SYNC_DECODE
: imgIContainer::FLAG_NONE;
return image->GetImageContainer(aManager, flags);
}
bool
nsDisplayImageContainer::CanOptimizeToImageLayer(LayerManager* aManager,
nsDisplayListBuilder* aBuilder)
{
uint32_t flags = aBuilder->ShouldSyncDecodeImages()
? imgIContainer::FLAG_SYNC_DECODE
: imgIContainer::FLAG_NONE;
nsCOMPtr<imgIContainer> image = GetImage();
if (!image) {
return false;
}
if (!image->IsImageContainerAvailable(aManager, flags)) {
return false;
}
int32_t imageWidth;
int32_t imageHeight;
image->GetWidth(&imageWidth);
image->GetHeight(&imageHeight);
if (imageWidth == 0 || imageHeight == 0) {
NS_ASSERTION(false, "invalid image size");
return false;
}
const int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel();
const LayoutDeviceRect destRect =
LayoutDeviceRect::FromAppUnits(GetDestRect(), factor);
// Calculate the scaling factor for the frame.
const gfxSize scale = gfxSize(destRect.width / imageWidth,
destRect.height / imageHeight);
if (scale.width < 0.34 || scale.height < 0.34) {
// This would look awful as long as we can't use high-quality downscaling
// for image layers (bug 803703), so don't turn this into an image layer.
return false;
}
return true;
}
void
nsDisplayBackgroundColor::ApplyOpacity(nsDisplayListBuilder* aBuilder,
float aOpacity,
const DisplayItemClip* aClip)
{
NS_ASSERTION(CanApplyOpacity(), "ApplyOpacity should be allowed");
mColor.a = mColor.a * aOpacity;
if (aClip) {
IntersectClip(aBuilder, *aClip);
}
}
bool
nsDisplayBackgroundColor::CanApplyOpacity() const
{
return true;
}
void
nsDisplayBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
if (mColor == Color()) {
return;
}
#if 0
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1148418#c21 for why this
// results in a precision induced rounding issue that makes the rect one
// pixel shorter in rare cases. Disabled in favor of the old code for now.
// Note that the pref layout.css.devPixelsPerPx needs to be set to 1 to
// reproduce the bug.
//
// TODO:
// This new path does not include support for background-clip:text; need to
// be fixed if/when we switch to this new code path.
DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
Rect rect = NSRectToSnappedRect(mBackgroundRect,
mFrame->PresContext()->AppUnitsPerDevPixel(),
aDrawTarget);
ColorPattern color(ToDeviceColor(mColor));
aDrawTarget.FillRect(rect, color);
#else
gfxContext* ctx = aCtx->ThebesContext();
gfxRect bounds =
nsLayoutUtils::RectToGfxRect(mBackgroundRect,
mFrame->PresContext()->AppUnitsPerDevPixel());
uint8_t clip = mBackgroundStyle->mImage.mLayers[0].mClip;
if (clip == NS_STYLE_IMAGELAYER_CLIP_TEXT) {
GenerateAndPushTextMask(mFrame, aCtx, mBackgroundRect);
ctx->SetColor(mColor);
ctx->Rectangle(bounds, true);
ctx->Fill();
ctx->PopGroupAndBlend();
return;
}
ctx->SetColor(mColor);
ctx->NewPath();
ctx->Rectangle(bounds, true);
ctx->Fill();
#endif
}
nsRegion
nsDisplayBackgroundColor::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap)
{
*aSnap = false;
if (mColor.a != 1) {
return nsRegion();
}
if (!mBackgroundStyle)
return nsRegion();
*aSnap = true;
const nsStyleImageLayers::Layer& bottomLayer = mBackgroundStyle->BottomLayer();
return nsDisplayBackgroundImage::GetInsideClipRegion(this, bottomLayer.mClip,
mBackgroundRect, mBackgroundRect);
}
bool
nsDisplayBackgroundColor::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor)
{
*aColor = mColor.ToABGR();
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);
}
void
nsDisplayBackgroundColor::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (rgba " << mColor.r << "," << mColor.g << ","
<< mColor.b << "," << mColor.a << ")";
}
already_AddRefed<Layer>
nsDisplayClearBackground::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
RefPtr<ColorLayer> layer = static_cast<ColorLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateColorLayer();
if (!layer)
return nullptr;
}
layer->SetColor(Color());
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");
if (aBuilder->IsInsidePointerEventsNoneDoc()) {
// Somewhere up the parent document chain is a subdocument with pointer-
// events:none set on it (and without a mozpasspointerevents).
return;
}
if (!aFrame->GetParent()) {
MOZ_ASSERT(aFrame->GetType() == nsGkAtoms::viewportFrame);
// Viewport frames are never event targets, other frames, like canvas frames,
// are the event targets for any regions viewport frames may cover.
return;
}
uint8_t pointerEvents =
aFrame->StyleUserInterface()->GetEffectivePointerEvents(aFrame);
if (pointerEvents == NS_STYLE_POINTER_EVENTS_NONE) {
return;
}
bool simpleRegions = aFrame->HasAnyStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS);
if (!simpleRegions) {
if (!aFrame->StyleVisibility()->IsVisible()) {
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;
if (nsLayoutUtils::GetScrollableFrameFor(aFrame)) {
// If the frame is content of a scrollframe, then we need to pick up the
// area corresponding to the overflow rect as well. Otherwise the parts of
// the overflow that are not occupied by descendants get skipped and the
// APZ code sends touch events to the content underneath instead.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1127773#c15.
borderBox = aFrame->GetScrollableOverflowRect();
} else {
borderBox = nsRect(nsPoint(0, 0), aFrame->GetSize());
}
borderBox += aBuilder->ToReferenceFrame(aFrame);
bool borderBoxHasRoundedCorners = false;
if (!simpleRegions) {
if (nsLayoutUtils::HasNonZeroCorner(aFrame->StyleBorder()->mBorderRadius)) {
borderBoxHasRoundedCorners = true;
} else {
aFrame->AddStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS);
}
}
const DisplayItemClip* clip = aBuilder->ClipState().GetCurrentCombinedClip(aBuilder);
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->IsBuildingNonLayerizedScrollbar() ||
aBuilder->GetAncestorHasApzAwareEventHandler())
{
// Scrollbars may be painted into a layer below the actual layer they will
// scroll, and therefore wheel events may be dispatched to the outer frame
// instead of the intended scrollframe. To address this, we force a d-t-c
// region on scrollbar frames that won't be placed in their own layer. See
// bug 1213324 for details.
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox);
} else if (aFrame->GetType() == nsGkAtoms::objectFrame) {
// If the frame is a plugin frame and wants to handle wheel events as
// default action, we should add the frame to dispatch-to-content region.
nsPluginFrame* pluginFrame = do_QueryFrame(aFrame);
if (pluginFrame && pluginFrame->WantsToHandleWheelEventAsDefaultAction()) {
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox);
}
}
// Touch action region
uint32_t touchAction = nsLayoutUtils::GetTouchActionFromFrame(aFrame);
if (touchAction & NS_STYLE_TOUCH_ACTION_NONE) {
mNoActionRegion.Or(mNoActionRegion, borderBox);
} else {
if ((touchAction & NS_STYLE_TOUCH_ACTION_PAN_X)) {
mHorizontalPanRegion.Or(mHorizontalPanRegion, borderBox);
}
if ((touchAction & NS_STYLE_TOUCH_ACTION_PAN_Y)) {
mVerticalPanRegion.Or(mVerticalPanRegion, borderBox);
}
}
}
void
nsDisplayLayerEventRegions::AddInactiveScrollPort(const nsRect& aRect)
{
mHitRegion.Or(mHitRegion, aRect);
mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, aRect);
}
void
nsDisplayLayerEventRegions::WriteDebugInfo(std::stringstream& aStream)
{
if (!mHitRegion.IsEmpty()) {
AppendToString(aStream, mHitRegion, " (hitRegion ", ")");
}
if (!mMaybeHitRegion.IsEmpty()) {
AppendToString(aStream, mMaybeHitRegion, " (maybeHitRegion ", ")");
}
if (!mDispatchToContentHitRegion.IsEmpty()) {
AppendToString(aStream, mDispatchToContentHitRegion, " (dispatchToContentRegion ", ")");
}
}
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(*aCtx->GetDrawTarget(), mFrame, ToReferenceFrame());
}
nsDisplayBorder::nsDisplayBorder(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplayBorder);
mBounds = CalculateBounds(*mFrame->StyleBorder());
}
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);
}
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
}
void
nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
? PaintBorderFlags::SYNC_DECODE_IMAGES
: PaintBorderFlags();
image::DrawResult result =
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->StyleContext(),
flags,
mFrame->GetSkipSides());
nsDisplayBorderGeometry::UpdateDrawResult(this, result);
}
nsRect
nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
*aSnap = true;
return mBounds;
}
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()));
}
nscoord radii[8];
if (mFrame->GetBorderRadii(radii)) {
if (border.left > 0 || border.top > 0) {
nsSize cornerSize(radii[NS_CORNER_TOP_LEFT_X], radii[NS_CORNER_TOP_LEFT_Y]);
result.UnionRect(result, nsRect(borderBounds.TopLeft(), cornerSize));
}
if (border.top > 0 || border.right > 0) {
nsSize cornerSize(radii[NS_CORNER_TOP_RIGHT_X], radii[NS_CORNER_TOP_RIGHT_Y]);
result.UnionRect(result, nsRect(borderBounds.TopRight() - nsPoint(cornerSize.width, 0), cornerSize));
}
if (border.right > 0 || border.bottom > 0) {
nsSize cornerSize(radii[NS_CORNER_BOTTOM_RIGHT_X], radii[NS_CORNER_BOTTOM_RIGHT_Y]);
result.UnionRect(result, nsRect(borderBounds.BottomRight() - nsPoint(cornerSize.width, cornerSize.height), cornerSize));
}
if (border.bottom > 0 || border.left > 0) {
nsSize cornerSize(radii[NS_CORNER_BOTTOM_LEFT_X], radii[NS_CORNER_BOTTOM_LEFT_Y]);
result.UnionRect(result, nsRect(borderBounds.BottomLeft() - nsPoint(0, cornerSize.height), cornerSize));
}
}
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;
for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
const nsRect& r = iter.Get();
if (accumulated.IsEmpty()) {
accumulated = r;
continue;
}
if (accumulated.YMost() >= r.y - accumulationMargin) {
accumulated.UnionRect(accumulated, r);
} else {
aRects->AppendElement(accumulated);
accumulated = r;
}
}
// Finish the in-flight rectangle, if there is one.
if (!accumulated.IsEmpty()) {
aRects->AppendElement(accumulated);
}
}
void
nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
nsPresContext* presContext = mFrame->PresContext();
AutoTArray<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.Sub(geometry->mBounds, geometry->mBorderRect);
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();
AutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
PROFILER_LABEL("nsDisplayBoxShadowInner", "Paint",
js::ProfileEntry::Category::GRAPHICS);
DrawTarget* drawTarget = aCtx->GetDrawTarget();
gfxContext* gfx = aCtx->ThebesContext();
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
for (uint32_t i = 0; i < rects.Length(); ++i) {
gfx->Save();
gfx->Clip(NSRectToSnappedRect(rects[i], appUnitsPerDevPixel, *drawTarget));
nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame, borderRect);
gfx->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)
: nsDisplayWrapList(aBuilder, aFrame, aList,
aBuilder->ClipState().GetCurrentInnermostScrollClip())
{}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const DisplayItemScrollClip* aScrollClip)
: nsDisplayItem(aBuilder, aFrame, aScrollClip)
, mOverrideZIndex(0)
, mHasZIndexOverride(false)
{
MOZ_COUNT_CTOR(nsDisplayWrapList);
mBaseVisibleRect = mVisibleRect;
mList.AppendToTop(aList);
UpdateBounds(aBuilder);
if (!aFrame || !aFrame->IsTransformed()) {
return;
}
// 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).
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);
mBaseVisibleRect = mVisibleRect;
mList.AppendToTop(aItem);
UpdateBounds(aBuilder);
if (!aFrame || !aFrame->IsTransformed()) {
return;
}
// 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,
AnimatedGeometryRoot* aExpectedAnimatedGeometryRootForChildren)
{
LayerState result = LAYER_INACTIVE;
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
if (result == LAYER_INACTIVE &&
i->GetAnimatedGeometryRoot() != aExpectedAnimatedGeometryRootForChildren) {
result = LAYER_ACTIVE;
}
LayerState state = i->GetLayerState(aBuilder, aManager, aParameters);
if (state == LAYER_ACTIVE && i->GetType() == nsDisplayItem::TYPE_BLEND_MODE) {
// nsDisplayBlendMode always returns LAYER_ACTIVE to ensure that the
// blending operation happens in the intermediate surface of its parent
// display item (usually an nsDisplayBlendContainer). But this does not
// mean that it needs all its ancestor display items to become active.
// So we ignore its layer state and look at its children instead.
state = RequiredLayerStateForChildren(aBuilder, aManager, aParameters,
*i->GetSameCoordinateSystemChildren(), i->GetAnimatedGeometryRoot());
}
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;
}
void
nsDisplayWrapList::SetReferenceFrame(const nsIFrame* aFrame)
{
mReferenceFrame = aFrame;
mToReferenceFrame = mFrame->GetOffsetToCrossDoc(mReferenceFrame);
}
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,
const DisplayItemScrollClip* aScrollClip,
bool aForEventsOnly)
: nsDisplayWrapList(aBuilder, aFrame, aList, aScrollClip)
, mOpacity(aFrame->StyleEffects()->mOpacity)
, mForEventsOnly(aForEventsOnly)
, mParticipatesInPreserve3D(false)
{
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) {
ContainerLayerParameters params = aContainerParameters;
params.mForEventsOnly = mForEventsOnly;
RefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
params, nullptr,
FrameLayerBuilder::CONTAINER_ALLOW_PULL_BACKGROUND_COLOR);
if (!container)
return nullptr;
container->SetOpacity(mOpacity);
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, mFrame,
eCSSProperty_opacity);
if (mParticipatesInPreserve3D) {
container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_EXTEND_3D_CONTEXT);
} else {
container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_EXTEND_3D_CONTEXT);
}
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);
}
static void
SetAnimationPerformanceWarningForTooSmallItem(nsDisplayItem* aItem,
nsCSSProperty aProperty)
{
// We use ToNearestPixels() here since ToOutsidePixels causes some sort of
// errors. See https://bugzilla.mozilla.org/show_bug.cgi?id=1258904#c19
nsIntRect visibleDevPixels = aItem->GetVisibleRect().ToNearestPixels(
aItem->Frame()->PresContext()->AppUnitsPerDevPixel());
// Set performance warning only if the visible dev pixels is not empty
// because dev pixels is empty if the frame has 'preserve-3d' style.
if (visibleDevPixels.IsEmpty()) {
return;
}
EffectCompositor::SetPerformanceWarning(aItem->Frame(), aProperty,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::ContentTooSmall,
{ visibleDevPixels.Width(), visibleDevPixels.Height() }));
}
bool
nsDisplayOpacity::NeedsActiveLayer(nsDisplayListBuilder* aBuilder)
{
if (ActiveLayerTracker::IsStyleAnimated(aBuilder, mFrame,
eCSSProperty_opacity) ||
EffectCompositor::HasAnimationsForCompositor(mFrame,
eCSSProperty_opacity)) {
if (!IsItemTooSmallForActiveLayer(this)) {
return true;
}
SetAnimationPerformanceWarningForTooSmallItem(this, eCSSProperty_opacity);
}
return false;
}
void
nsDisplayOpacity::ApplyOpacity(nsDisplayListBuilder* aBuilder,
float aOpacity,
const DisplayItemClip* aClip)
{
NS_ASSERTION(CanApplyOpacity(), "ApplyOpacity should be allowed");
mOpacity = mOpacity * aOpacity;
if (aClip) {
IntersectClip(aBuilder, *aClip);
}
}
bool
nsDisplayOpacity::CanApplyOpacity() const
{
return true;
}
bool
nsDisplayOpacity::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
if (NeedsActiveLayer(aBuilder) || mOpacity == 0.0) {
// If our opacity is zero then we'll discard all descendant display items
// except for layer event regions, so there's no point in doing this
// optimization (and if we do do it, then invalidations of those descendants
// might trigger repainting).
return false;
}
nsDisplayItem* child = mList.GetBottom();
// Only try folding our opacity down if we have at most three children
// that don't overlap and can all apply the opacity to themselves.
if (!child) {
return false;
}
struct {
nsDisplayItem* item;
nsRect bounds;
} children[3];
bool snap;
uint32_t numChildren = 0;
for (; numChildren < ArrayLength(children) && child; numChildren++, child = child->GetAbove()) {
if (child->GetType() == nsDisplayItem::TYPE_LAYER_EVENT_REGIONS) {
numChildren--;
continue;
}
if (!child->CanApplyOpacity()) {
return false;
}
children[numChildren].item = child;
children[numChildren].bounds = child->GetBounds(aBuilder, &snap);
}
if (child) {
// we have a fourth (or more) child
return false;
}
for (uint32_t i = 0; i < numChildren; i++) {
for (uint32_t j = i+1; j < numChildren; j++) {
if (children[i].bounds.Intersects(children[j].bounds)) {
return false;
}
}
}
for (uint32_t i = 0; i < numChildren; i++) {
children[i].item->ApplyOpacity(aBuilder, mOpacity, mClip);
}
return true;
}
nsDisplayItem::LayerState
nsDisplayOpacity::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) {
// If we only created this item so that we'd get correct nsDisplayEventRegions for child
// frames, then force us to inactive to avoid unnecessary layerization changes for content
// that won't ever be painted.
if (mForEventsOnly) {
MOZ_ASSERT(mOpacity == 0);
return LAYER_INACTIVE;
}
if (NeedsActiveLayer(aBuilder)) {
// Returns LAYER_ACTIVE_FORCE to avoid flatterning the layer for async
// animations.
return LAYER_ACTIVE_FORCE;
}
return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, mList, GetAnimatedGeometryRoot());
}
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(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;
if (aItem->ScrollClip() != ScrollClip())
return false;
MergeFromTrackingMergedFrames(static_cast<nsDisplayOpacity*>(aItem));
return true;
}
void
nsDisplayOpacity::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (opacity " << mOpacity << ")";
}
nsDisplayBlendMode::nsDisplayBlendMode(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint8_t aBlendMode,
const DisplayItemScrollClip* aScrollClip,
uint32_t aIndex)
: nsDisplayWrapList(aBuilder, aFrame, aList, aScrollClip)
, mBlendMode(aBlendMode)
, mIndex(aIndex)
{
MOZ_COUNT_CTOR(nsDisplayBlendMode);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayBlendMode::~nsDisplayBlendMode() {
MOZ_COUNT_DTOR(nsDisplayBlendMode);
}
#endif
nsRegion nsDisplayBlendMode::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
*aSnap = false;
// We are never considered opaque
return nsRegion();
}
LayerState
nsDisplayBlendMode::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return LAYER_ACTIVE;
}
// nsDisplayBlendMode uses layers for rendering
already_AddRefed<Layer>
nsDisplayBlendMode::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
ContainerLayerParameters newContainerParameters = aContainerParameters;
newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true;
RefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr);
if (!container) {
return nullptr;
}
container->SetMixBlendMode(nsCSSRendering::GetGFXBlendMode(mBlendMode));
return container.forget();
}
bool nsDisplayBlendMode::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 nsDisplayBlendMode::TryMerge(nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_BLEND_MODE)
return false;
nsDisplayBlendMode* item = static_cast<nsDisplayBlendMode*>(aItem);
// items for the same content element should be merged into a single
// compositing group
if (item->Frame()->GetContent() != mFrame->GetContent())
return false;
if (item->mIndex != 0 || mIndex != 0)
return false; // don't merge background-blend-mode items
if (item->GetClip() != GetClip())
return false;
if (item->ScrollClip() != ScrollClip())
return false;
MergeFromTrackingMergedFrames(item);
return true;
}
/* static */ nsDisplayBlendContainer*
nsDisplayBlendContainer::CreateForMixBlendMode(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const DisplayItemScrollClip* aScrollClip)
{
return new (aBuilder) nsDisplayBlendContainer(aBuilder, aFrame, aList, aScrollClip, false);
}
/* static */ nsDisplayBlendContainer*
nsDisplayBlendContainer::CreateForBackgroundBlendMode(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const DisplayItemScrollClip* aScrollClip)
{
return new (aBuilder) nsDisplayBlendContainer(aBuilder, aFrame, aList, aScrollClip, true);
}
nsDisplayBlendContainer::nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const DisplayItemScrollClip* aScrollClip,
bool aIsForBackground)
: nsDisplayWrapList(aBuilder, aFrame, aList, aScrollClip)
, mIsForBackground(aIsForBackground)
{
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;
RefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr);
if (!container) {
return nullptr;
}
container->SetForceIsolatedGroup(true);
return container.forget();
}
LayerState
nsDisplayBlendContainer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, mList, GetAnimatedGeometryRoot());
}
bool nsDisplayBlendContainer::TryMerge(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;
if (aItem->ScrollClip() != ScrollClip())
return false;
MergeFromTrackingMergedFrames(static_cast<nsDisplayBlendContainer*>(aItem));
return true;
}
nsDisplayOwnLayer::nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags, ViewID aScrollTarget,
float aScrollbarThumbRatio)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mFlags(aFlags)
, mScrollTarget(aScrollTarget)
, mScrollbarThumbRatio(aScrollbarThumbRatio)
{
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)
{
RefPtr<ContainerLayer> layer = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
aContainerParameters, nullptr,
FrameLayerBuilder::CONTAINER_ALLOW_PULL_BACKGROUND_COLOR);
if (mFlags & VERTICAL_SCROLLBAR) {
layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::VERTICAL, mScrollbarThumbRatio);
}
if (mFlags & HORIZONTAL_SCROLLBAR) {
layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::HORIZONTAL, mScrollbarThumbRatio);
}
if (mFlags & SCROLLBAR_CONTAINER) {
layer->SetIsScrollbarContainer();
}
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);
mForceDispatchToContentRegion =
aBuilder->IsBuildingLayerEventRegions() &&
nsLayoutUtils::HasDocumentLevelListenersForApzAwareEvents(aFrame->PresContext()->PresShell());
}
#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::HasCriticalDisplayPort(rootScrollFrame->GetContent())) {
params.mInLowPrecisionDisplayPort = true;
}
RefPtr<Layer> layer = nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, params);
layer->AsContainerLayer()->SetEventRegionsOverride(mForceDispatchToContentRegion
? EventRegionsOverride::ForceDispatchToContent
: EventRegionsOverride::NoOverride);
return layer.forget();
}
UniquePtr<ScrollMetadata>
nsDisplaySubDocument::ComputeScrollMetadata(Layer* aLayer,
const ContainerLayerParameters& aContainerParameters)
{
if (!(mFlags & GENERATE_SCROLLABLE_LAYER)) {
return UniquePtr<ScrollMetadata>(nullptr);
}
nsPresContext* presContext = mFrame->PresContext();
nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame();
bool isRootContentDocument = presContext->IsRootContentDocument();
nsIPresShell* presShell = presContext->PresShell();
ContainerLayerParameters params(
aContainerParameters.mXScale * presShell->GetResolution(),
aContainerParameters.mYScale * presShell->GetResolution(),
nsIntPoint(), aContainerParameters);
if ((mFlags & GENERATE_SCROLLABLE_LAYER) &&
rootScrollFrame->GetContent() &&
nsLayoutUtils::HasCriticalDisplayPort(rootScrollFrame->GetContent())) {
params.mInLowPrecisionDisplayPort = true;
}
nsRect viewport = mFrame->GetRect() -
mFrame->GetPosition() +
mFrame->GetOffsetToCrossDoc(ReferenceFrame());
return MakeUnique<ScrollMetadata>(
nsLayoutUtils::ComputeScrollMetadata(
mFrame, rootScrollFrame, rootScrollFrame->GetContent(), ReferenceFrame(),
aLayer, mScrollParentId, viewport, Nothing(),
isRootContentDocument, params));
}
static bool
UseDisplayPortForViewport(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
{
return aBuilder->IsPaintingToWindow() &&
nsLayoutUtils::ViewportHasDisplayPort(aFrame->PresContext());
}
nsRect
nsDisplaySubDocument::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
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)
{
bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
if (!(mFlags & GENERATE_SCROLLABLE_LAYER) || !usingDisplayPort) {
return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion);
}
nsRect displayport;
nsIFrame* rootScrollFrame = mFrame->PresContext()->PresShell()->GetRootScrollFrame();
MOZ_ASSERT(rootScrollFrame);
Unused << nsLayoutUtils::GetDisplayPort(rootScrollFrame->GetContent(), &displayport,
RelativeTo::ScrollFrame);
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);
// 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(mFrame)) {
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 = UseDisplayPortForViewport(aBuilder, mFrame);
if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) {
return true;
}
return nsDisplayOwnLayer::ShouldBuildLayerEvenIfInvisible(aBuilder);
}
nsRegion
nsDisplaySubDocument::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
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
void
nsDisplayResolution::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
nsIPresShell* presShell = mFrame->PresContext()->PresShell();
nsRect rect = aRect.RemoveResolution(presShell->ScaleToResolution() ? presShell->GetResolution () : 1.0f);
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
already_AddRefed<Layer>
nsDisplayResolution::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
nsIPresShell* presShell = mFrame->PresContext()->PresShell();
ContainerLayerParameters containerParameters(
presShell->GetResolution(), presShell->GetResolution(), nsIntPoint(),
aContainerParameters);
RefPtr<Layer> layer = nsDisplaySubDocument::BuildLayer(
aBuilder, aManager, containerParameters);
layer->SetPostScale(1.0f / presShell->GetResolution(),
1.0f / presShell->GetResolution());
layer->AsContainerLayer()->SetScaleToResolution(
presShell->ScaleToResolution(), presShell->GetResolution());
return layer.forget();
}
nsDisplayFixedPosition::nsDisplayFixedPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: nsDisplayOwnLayer(aBuilder, aFrame, aList)
, mIndex(0)
, mIsFixedBackground(false)
{
MOZ_COUNT_CTOR(nsDisplayFixedPosition);
Init(aBuilder);
}
nsDisplayFixedPosition::nsDisplayFixedPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList,
uint32_t aIndex)
: nsDisplayOwnLayer(aBuilder, aFrame, aList)
, mIndex(aIndex)
, mIsFixedBackground(true)
{
MOZ_COUNT_CTOR(nsDisplayFixedPosition);
Init(aBuilder);
}
void
nsDisplayFixedPosition::Init(nsDisplayListBuilder* aBuilder)
{
bool snap;
mVisibleRect = GetBounds(aBuilder, &snap);
mAnimatedGeometryRootForScrollMetadata = mAnimatedGeometryRoot;
if (ShouldFixToViewport(aBuilder)) {
mAnimatedGeometryRoot = aBuilder->FindAnimatedGeometryRootFor(this);
}
}
/* static */ nsDisplayFixedPosition*
nsDisplayFixedPosition::CreateForFixedBackground(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayBackgroundImage* aImage,
uint32_t aIndex)
{
// Clear clipping on the child item, since we will apply it to the
// fixed position item as well.
aImage->SetClip(aBuilder, DisplayItemClip());
aImage->SetScrollClip(nullptr);
nsDisplayList temp;
temp.AppendToTop(aImage);
return new (aBuilder) nsDisplayFixedPosition(aBuilder, aFrame, &temp, aIndex + 1);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayFixedPosition::~nsDisplayFixedPosition() {
MOZ_COUNT_DTOR(nsDisplayFixedPosition);
}
#endif
already_AddRefed<Layer>
nsDisplayFixedPosition::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) {
RefPtr<Layer> layer =
nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, aContainerParameters);
layer->SetIsFixedPosition(true);
nsPresContext* presContext = Frame()->PresContext();
nsIFrame* fixedFrame = mIsFixedBackground ? presContext->PresShell()->GetRootFrame() : Frame();
const nsIFrame* viewportFrame = fixedFrame->GetParent();
// anchorRect will be in the container's coordinate system (aLayer's parent layer).
// This is the same as the display items' reference frame.
nsRect anchorRect;
if (viewportFrame) {
// Fixed position frames are reflowed into the scroll-port size if one has
// been set.
if (presContext->PresShell()->IsScrollPositionClampingScrollPortSizeSet()) {
anchorRect.SizeTo(presContext->PresShell()->GetScrollPositionClampingScrollPortSize());
} else {
anchorRect.SizeTo(viewportFrame->GetSize());
}
} else {
// A display item directly attached to the viewport.
// For background-attachment:fixed items, the anchor point is always the
// top-left of the viewport currently.
viewportFrame = fixedFrame;
}
// The anchorRect top-left is always the viewport top-left.
anchorRect.MoveTo(viewportFrame->GetOffsetToCrossDoc(ReferenceFrame()));
nsLayoutUtils::SetFixedPositionLayerData(layer,
viewportFrame, anchorRect, fixedFrame, presContext, aContainerParameters);
return layer.forget();
}
bool nsDisplayFixedPosition::TryMerge(nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_FIXED_POSITION)
return false;
// Items with the same fixed position frame can be merged.
nsDisplayFixedPosition* other = static_cast<nsDisplayFixedPosition*>(aItem);
if (other->mFrame != mFrame)
return false;
if (aItem->GetClip() != GetClip())
return false;
MergeFromTrackingMergedFrames(other);
return true;
}
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) {
RefPtr<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(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;
if (aItem->ScrollClip() != ScrollClip())
return false;
MergeFromTrackingMergedFrames(other);
return true;
}
nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
nsDisplayListBuilder* aBuilder,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayWrapList(aBuilder, aScrollFrame)
, mScrollFrame(aScrollFrame)
, mScrolledFrame(aScrolledFrame)
, mScrollParentId(aBuilder->GetCurrentScrollParentId())
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
#endif
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer);
}
#endif
already_AddRefed<Layer>
nsDisplayScrollInfoLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
// In general for APZ with event-regions we no longer have a need for
// scrollinfo layers. However, in some cases, there might be content that
// cannot be layerized, and so needs to scroll synchronously. To handle those
// cases, we still want to generate scrollinfo layers.
ContainerLayerParameters params = aContainerParameters;
if (mScrolledFrame->GetContent() &&
nsLayoutUtils::HasCriticalDisplayPort(mScrolledFrame->GetContent())) {
params.mInLowPrecisionDisplayPort = true;
}
return aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
params, nullptr,
FrameLayerBuilder::CONTAINER_ALLOW_PULL_BACKGROUND_COLOR);
}
LayerState
nsDisplayScrollInfoLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return LAYER_ACTIVE_EMPTY;
}
UniquePtr<ScrollMetadata>
nsDisplayScrollInfoLayer::ComputeScrollMetadata(Layer* aLayer,
const ContainerLayerParameters& aContainerParameters)
{
ContainerLayerParameters params = aContainerParameters;
if (mScrolledFrame->GetContent() &&
nsLayoutUtils::HasCriticalDisplayPort(mScrolledFrame->GetContent())) {
params.mInLowPrecisionDisplayPort = true;
}
nsRect viewport = mScrollFrame->GetRect() -
mScrollFrame->GetPosition() +
mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
ScrollMetadata metadata = nsLayoutUtils::ComputeScrollMetadata(
mScrolledFrame, mScrollFrame, mScrollFrame->GetContent(),
ReferenceFrame(), aLayer,
mScrollParentId, viewport, Nothing(), false, params);
metadata.GetMetrics().SetIsScrollInfoLayer(true);
return UniquePtr<ScrollMetadata>(new ScrollMetadata(metadata));
}
void
nsDisplayScrollInfoLayer::WriteDebugInfo(std::stringstream& aStream)
{
aStream << " (scrollframe " << mScrollFrame
<< " scrolledFrame " << mScrolledFrame << ")";
}
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.ScaleToOtherAppUnitsRoundOut(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().ScaleToOtherAppUnits(mParentAPD, mAPD));
rect.width = rect.height = 1;
} else {
rect = aRect.ScaleToOtherAppUnitsRoundOut(mParentAPD, mAPD);
}
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
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.ScaleToOtherAppUnitsRoundOut(mParentAPD, mAPD);
nsRegion originalVisibleRegion = visibleRegion;
nsRect transformedVisibleRect =
mVisibleRect.ScaleToOtherAppUnitsRoundOut(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 = UseDisplayPortForViewport(aBuilder, mFrame);
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.ScaleToOtherAppUnitsRoundIn(mAPD, mParentAPD);
// aVisibleRegion = aVisibleRegion - removed (modulo any simplifications
// SubtractFromVisibleRegion does)
aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed);
return retval;
}
///////////////////////////////////////////////////
// nsDisplayTransform Implementation
//
// Write #define UNIFIED_CONTINUATIONS here and in
// TransformReferenceBox::Initialize 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
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)
, mAnimatedGeometryRootForChildren(mAnimatedGeometryRoot)
, mAnimatedGeometryRootForScrollMetadata(mAnimatedGeometryRoot)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
, mNoExtendContext(false)
, mIsTransformSeparator(false)
, mTransformPreserves3DInited(false)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
Init(aBuilder);
}
void
nsDisplayTransform::SetReferenceFrameToAncestor(nsDisplayListBuilder* aBuilder)
{
if (mFrame == aBuilder->RootReferenceFrame()) {
return;
}
nsIFrame *outerFrame = nsLayoutUtils::GetCrossDocParentFrame(mFrame);
mReferenceFrame =
aBuilder->FindReferenceFrameFor(outerFrame);
mToReferenceFrame = mFrame->GetOffsetToCrossDoc(mReferenceFrame);
if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(mFrame)) {
// This is an odd special case. If we are both IsFixedPosFrameInDisplayPort
// and transformed that we are our own AGR parent.
// We want our frame to be our AGR because FrameLayerBuilder uses our AGR to
// determine if we are inside a fixed pos subtree. If we use the outer AGR
// from outside the fixed pos subtree FLB can't tell that we are fixed pos.
mAnimatedGeometryRoot = mAnimatedGeometryRootForChildren;
} else if (mFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY &&
IsStickyFrameActive(aBuilder, mFrame, nullptr)) {
// Similar to the IsFixedPosFrameInDisplayPort case we are our own AGR.
// We are inside the sticky position, so our AGR is the sticky positioned
// frame, which is our AGR, not the parent AGR.
mAnimatedGeometryRoot = mAnimatedGeometryRootForChildren;
} else if (mAnimatedGeometryRoot->mParentAGR) {
mAnimatedGeometryRootForScrollMetadata = mAnimatedGeometryRoot->mParentAGR;
if (!MayBeAnimated(aBuilder)) {
// If we're an animated transform then we want the same AGR as our children
// so that FrameLayerBuilder knows that this layer moves with the transform
// and won't compute occlusions. If we're not animated then use our parent
// AGR so that inactive transform layers can go in the same PaintedLayer as
// surrounding content.
mAnimatedGeometryRoot = mAnimatedGeometryRoot->mParentAGR;
}
}
mVisibleRect = aBuilder->GetDirtyRect() + mToReferenceFrame;
}
void
nsDisplayTransform::Init(nsDisplayListBuilder* aBuilder)
{
mHasBounds = false;
mStoredList.SetClip(aBuilder, DisplayItemClip::NoClip());
mStoredList.SetVisibleRect(mChildrenVisibleRect);
mMaybePrerender = ShouldPrerenderTransformedContent(aBuilder, mFrame);
const nsStyleDisplay* disp = mFrame->StyleDisplay();
if ((disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_TRANSFORM)) {
// We will only pre-render if this will-change is on budget.
mMaybePrerender = true;
}
if (mMaybePrerender) {
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)
, mAnimatedGeometryRootForChildren(mAnimatedGeometryRoot)
, mAnimatedGeometryRootForScrollMetadata(mAnimatedGeometryRoot)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
, mNoExtendContext(false)
, mIsTransformSeparator(false)
, mTransformPreserves3DInited(false)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
SetReferenceFrameToAncestor(aBuilder);
Init(aBuilder);
UpdateBoundsFor3D(aBuilder);
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame *aFrame, nsDisplayItem *aItem,
const nsRect& aChildrenVisibleRect,
uint32_t aIndex)
: nsDisplayItem(aBuilder, aFrame)
, mStoredList(aBuilder, aFrame, aItem)
, mTransformGetter(nullptr)
, mAnimatedGeometryRootForChildren(mAnimatedGeometryRoot)
, mAnimatedGeometryRootForScrollMetadata(mAnimatedGeometryRoot)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
, mNoExtendContext(false)
, mIsTransformSeparator(false)
, mTransformPreserves3DInited(false)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
SetReferenceFrameToAncestor(aBuilder);
Init(aBuilder);
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame *aFrame, nsDisplayList *aList,
const nsRect& aChildrenVisibleRect,
const Matrix4x4& aTransform,
uint32_t aIndex)
: nsDisplayItem(aBuilder, aFrame)
, mStoredList(aBuilder, aFrame, aList)
, mTransform(aTransform)
, mTransformGetter(nullptr)
, mAnimatedGeometryRootForChildren(mAnimatedGeometryRoot)
, mAnimatedGeometryRootForScrollMetadata(mAnimatedGeometryRoot)
, mChildrenVisibleRect(aChildrenVisibleRect)
, mIndex(aIndex)
, mNoExtendContext(false)
, mIsTransformSeparator(true)
, mTransformPreserves3DInited(false)
{
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
Init(aBuilder);
UpdateBoundsFor3D(aBuilder);
}
/* Returns the delta specified by the 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() ||
aFrame->Combines3DTransformWithAncestors(),
"Shouldn't get a delta for an untransformed frame!");
if (!aFrame->IsTransformed()) {
return Point3D();
}
/* For both of the coordinates, if the value of 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();
// We don't use aBoundsOverride for SVG since we need to account for
// refBox.X/Y(). This happens to work because ReflowSVG sets the frame's
// mRect before calling FinishAndStoreOverflow so we don't need the override.
TransformReferenceBox refBox;
if (aBoundsOverride &&
!(aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
refBox.Init(aBoundsOverride->Size());
} else {
refBox.Init(aFrame);
}
/* Allows us to access dimension getters by index. */
float coords[2];
TransformReferenceBox::DimensionGetter dimensionGetter[] =
{ &TransformReferenceBox::Width, &TransformReferenceBox::Height };
TransformReferenceBox::DimensionGetter offsetGetter[] =
{ &TransformReferenceBox::X, &TransformReferenceBox::Y };
for (uint8_t index = 0; index < 2; ++index) {
/* If the 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((refBox.*dimensionGetter[index])(), aAppUnitsPerPixel) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
coords[index] =
NSAppUnitsToFloatPixels((refBox.*dimensionGetter[index])(), aAppUnitsPerPixel) *
coord.GetPercentValue();
} else {
MOZ_ASSERT(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
coords[index] =
NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel);
}
if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
// SVG frames (unlike other frames) have a reference box that can be (and
// typically is) offset from the TopLeft() of the frame. We need to
// account for that here.
coords[index] +=
NSAppUnitsToFloatPixels((refBox.*offsetGetter[index])(), aAppUnitsPerPixel);
}
}
return Point3D(coords[0], coords[1],
NSAppUnitsToFloatPixels(display->mTransformOrigin[2].GetCoordValue(),
aAppUnitsPerPixel));
}
/* static */ bool
nsDisplayTransform::ComputePerspectiveMatrix(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
Matrix4x4& aOutMatrix)
{
NS_PRECONDITION(aFrame, "Can't get delta for a null frame!");
NS_PRECONDITION(aFrame->IsTransformed() ||
aFrame->StyleDisplay()->BackfaceIsHidden() ||
aFrame->Combines3DTransformWithAncestors(),
"Shouldn't get a delta for an untransformed frame!");
NS_PRECONDITION(aOutMatrix.IsIdentity(), "Must have a blank output matrix");
if (!aFrame->IsTransformed()) {
return false;
}
/* Find our containing block, which is the element that provides the
* value for perspective we need to use
*/
//TODO: Is it possible that the cbFrame's bounds haven't been set correctly yet
// (similar to the aBoundsOverride case for GetResultingTransformMatrix)?
nsIFrame* cbFrame = aFrame->GetContainingBlock(nsIFrame::SKIP_SCROLLED_FRAME);
if (!cbFrame) {
return false;
}
/* Grab the values for perspective and perspective-origin (if present) */
const nsStyleDisplay* cbDisplay = cbFrame->StyleDisplay();
if (cbDisplay->mChildPerspective.GetUnit() != eStyleUnit_Coord) {
return false;
}
nscoord perspective = cbDisplay->mChildPerspective.GetCoordValue();
if (perspective <= 0) {
return true;
}
TransformReferenceBox refBox(cbFrame);
/* Allows us to access named variables by index. */
Point3D perspectiveOrigin;
gfx::Float* coords[2] = {&perspectiveOrigin.x, &perspectiveOrigin.y};
TransformReferenceBox::DimensionGetter dimensionGetter[] =
{ &TransformReferenceBox::Width, &TransformReferenceBox::Height };
/* For both of the coordinates, if the value of 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!
*/
for (uint8_t index = 0; index < 2; ++index) {
/* If the -transform-origin specifies a percentage, take the percentage
* of the size of the box.
*/
const nsStyleCoord &coord = cbDisplay->mPerspectiveOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
*coords[index] =
NSAppUnitsToFloatPixels((refBox.*dimensionGetter[index])(), aAppUnitsPerPixel) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
*coords[index] =
NSAppUnitsToFloatPixels((refBox.*dimensionGetter[index])(), aAppUnitsPerPixel) *
coord.GetPercentValue();
} else {
MOZ_ASSERT(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
*coords[index] =
NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel);
}
}
/* GetOffsetTo computes the offset required to move from 0,0 in cbFrame to 0,0
* in aFrame. Although we actually want the inverse of this, it's faster to
* compute this way.
*/
nsPoint frameToCbOffset = -aFrame->GetOffsetTo(cbFrame);
Point3D frameToCbGfxOffset(
NSAppUnitsToFloatPixels(frameToCbOffset.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(frameToCbOffset.y, aAppUnitsPerPixel),
0.0f);
/* Move the perspective origin to be relative to aFrame, instead of relative
* to the containing block which is how it was specified in the style system.
*/
perspectiveOrigin += frameToCbGfxOffset;
aOutMatrix._34 =
-1.0 / NSAppUnitsToFloatPixels(perspective, aAppUnitsPerPixel);
aOutMatrix.ChangeBasis(perspectiveOrigin);
return true;
}
nsDisplayTransform::FrameTransformProperties::FrameTransformProperties(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride)
: mFrame(aFrame)
, mTransformList(aFrame->StyleDisplay()->mSpecifiedTransform)
, mToTransformOrigin(GetDeltaToTransformOrigin(aFrame, aAppUnitsPerPixel, aBoundsOverride))
{
}
/* Wraps up the transform matrix in a change-of-basis matrix pair that
* translates from local coordinate space to transform coordinate space, then
* hands it back.
*/
Matrix4x4
nsDisplayTransform::GetResultingTransformMatrix(const FrameTransformProperties& aProperties,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
uint32_t aFlags,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor)
{
return GetResultingTransformMatrixInternal(aProperties, aOrigin, aAppUnitsPerPixel,
aFlags, aBoundsOverride, aOutAncestor);
}
Matrix4x4
nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
uint32_t aFlags,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor)
{
FrameTransformProperties props(aFrame,
aAppUnitsPerPixel,
aBoundsOverride);
return GetResultingTransformMatrixInternal(props, aOrigin, aAppUnitsPerPixel,
aFlags, aBoundsOverride, aOutAncestor);
}
Matrix4x4
nsDisplayTransform::GetResultingTransformMatrixInternal(const FrameTransformProperties& aProperties,
const nsPoint& aOrigin,
float aAppUnitsPerPixel,
uint32_t aFlags,
const nsRect* aBoundsOverride,
nsIFrame** aOutAncestor)
{
const nsIFrame *frame = aProperties.mFrame;
NS_ASSERTION(frame || !(aFlags & INCLUDE_PERSPECTIVE), "Must have a frame to compute perspective!");
MOZ_ASSERT((aFlags & (OFFSET_BY_ORIGIN|BASIS_AT_ORIGIN)) != (OFFSET_BY_ORIGIN|BASIS_AT_ORIGIN),
"Can't specify offset by origin as well as basis at origin!");
if (aOutAncestor) {
*aOutAncestor = nsLayoutUtils::GetCrossDocParentFrame(frame);
}
// Get the underlying transform matrix:
// We don't use aBoundsOverride for SVG since we need to account for
// refBox.X/Y(). This happens to work because ReflowSVG sets the frame's
// mRect before calling FinishAndStoreOverflow so we don't need the override.
TransformReferenceBox refBox;
if (aBoundsOverride &&
(!frame || !(frame->GetStateBits() & NS_FRAME_SVG_LAYOUT))) {
refBox.Init(aBoundsOverride->Size());
} else {
refBox.Init(frame);
}
/* Get the matrix, then change its basis to factor in the origin. */
RuleNodeCacheConditions dummy;
bool dummyBool;
Matrix4x4 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);
bool hasTransformFromSVGParent =
hasSVGTransforms && !transformFromSVGParent.IsIdentity();
/* 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, refBox, aAppUnitsPerPixel,
&dummyBool);
} else if (hasSVGTransforms) {
// Correct the translation components for zoom:
float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() /
aAppUnitsPerPixel;
svgTransform._31 *= pixelsPerCSSPx;
svgTransform._32 *= pixelsPerCSSPx;
result = Matrix4x4::From2D(svgTransform);
}
/* Account for the 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);
Matrix4x4 perspectiveMatrix;
bool hasPerspective = aFlags & INCLUDE_PERSPECTIVE;
if (hasPerspective) {
hasPerspective = ComputePerspectiveMatrix(frame, aAppUnitsPerPixel,
perspectiveMatrix);
}
if (!hasSVGTransforms || !hasTransformFromSVGParent) {
// This is a simplification of the following |else| block, the
// simplification being possible because we don't need to apply
// mToTransformOrigin between two transforms.
if ((aFlags & OFFSET_BY_ORIGIN) &&
!hasPerspective) {
// 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.PreTranslate(-aProperties.mToTransformOrigin);
result.PostTranslate(roundedOrigin + aProperties.mToTransformOrigin);
} else {
result.ChangeBasis(aProperties.mToTransformOrigin);
}
} else {
Point3D refBoxOffset(NSAppUnitsToFloatPixels(refBox.X(), aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(refBox.Y(), aAppUnitsPerPixel),
0);
// We have both a transform and children-only transform. The
// 'transform-origin' must apply between the two, so we need to apply it
// now before we apply transformFromSVGParent. Since mToTransformOrigin is
// relative to the frame's TopLeft(), we need to convert it to SVG user
// space by subtracting refBoxOffset. (Then after applying
// transformFromSVGParent we have to reapply refBoxOffset below.)
result.ChangeBasis(aProperties.mToTransformOrigin - refBoxOffset);
// Now apply the children-only transforms, converting the translation
// components to device pixels:
float pixelsPerCSSPx =
frame->PresContext()->AppUnitsPerCSSPixel() / aAppUnitsPerPixel;
transformFromSVGParent._31 *= pixelsPerCSSPx;
transformFromSVGParent._32 *= pixelsPerCSSPx;
result = result * Matrix4x4::From2D(transformFromSVGParent);
// Similar to the code in the |if| block above, but since we've accounted
// for mToTransformOrigin so we don't include that. We also need to reapply
// refBoxOffset.
if ((aFlags & OFFSET_BY_ORIGIN) &&
!hasPerspective) {
result.PreTranslate(-refBoxOffset);
result.PostTranslate(roundedOrigin + refBoxOffset);
} else {
result.ChangeBasis(refBoxOffset);
}
}
if (hasPerspective) {
result = result * perspectiveMatrix;
if (aFlags & OFFSET_BY_ORIGIN) {
result.PostTranslate(roundedOrigin);
}
}
if (aFlags & BASIS_AT_ORIGIN) {
result.ChangeBasis(roundedOrigin);
}
if ((aFlags & INCLUDE_PRESERVE3D_ANCESTORS) &&
frame && frame->Combines3DTransformWithAncestors()) {
// Include the transform set on our parent
NS_ASSERTION(frame->GetParent() &&
frame->GetParent()->IsTransformed() &&
frame->GetParent()->Extend3DContext(),
"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
// OFFSET_BY_ORIGIN to convert into the correct coordinate space.
uint32_t flags = aFlags & (INCLUDE_PRESERVE3D_ANCESTORS|INCLUDE_PERSPECTIVE);
if (!frame->IsTransformed()) {
flags |= OFFSET_BY_ORIGIN;
} else {
flags |= BASIS_AT_ORIGIN;
}
Matrix4x4 parent =
GetResultingTransformMatrixInternal(props,
aOrigin - frame->GetPosition(),
aAppUnitsPerPixel, flags,
nullptr, aOutAncestor);
result = result * parent;
}
return result;
}
bool
nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
{
if (ActiveLayerTracker::IsStyleAnimated(aBuilder, mFrame, eCSSProperty_opacity)) {
return true;
}
EffectCompositor::SetPerformanceWarning(
mFrame, eCSSProperty_transform,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::OpacityFrameInactive));
return false;
}
bool
nsDisplayTransform::ShouldPrerender(nsDisplayListBuilder* aBuilder) {
if (!mMaybePrerender) {
return false;
}
if (ShouldPrerenderTransformedContent(aBuilder, mFrame)) {
return true;
}
const nsStyleDisplay* disp = mFrame->StyleDisplay();
if ((disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_TRANSFORM) &&
aBuilder->IsInWillChangeBudget(mFrame, mFrame->GetSize())) {
return true;
}
return false;
}
bool
nsDisplayTransform::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
{
if (mMaybePrerender) {
// TODO We need to make sure that if we use async animation we actually
// pre-render even if we're out of will change budget.
return true;
}
DebugOnly<bool> prerender = ShouldPrerenderTransformedContent(aBuilder, mFrame);
NS_ASSERTION(!prerender, "Something changed under us!");
return false;
}
/* static */ bool
nsDisplayTransform::ShouldPrerenderTransformedContent(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
{
// 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::IsStyleMaybeAnimated(aFrame, eCSSProperty_transform) &&
!EffectCompositor::HasAnimationsForCompositor(aFrame,
eCSSProperty_transform)) {
EffectCompositor::SetPerformanceWarning(
aFrame, eCSSProperty_transform,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::TransformFrameInactive));
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;
}
}
nsRect visual = aFrame->GetVisualOverflowRect();
EffectCompositor::SetPerformanceWarning(
aFrame, eCSSProperty_transform,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::ContentTooLarge,
{
nsPresContext::AppUnitsToIntCSSPixels(frameSize.width),
nsPresContext::AppUnitsToIntCSSPixels(frameSize.height),
nsPresContext::AppUnitsToIntCSSPixels(refSize.width),
nsPresContext::AppUnitsToIntCSSPixels(refSize.height),
nsPresContext::AppUnitsToIntCSSPixels(visual.width),
nsPresContext::AppUnitsToIntCSSPixels(visual.height),
nsPresContext::AppUnitsToIntCSSPixels(maxInAppUnits)
}));
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 if (!mIsTransformSeparator) {
DebugOnly<bool> isReference =
mFrame->IsTransformed() ||
mFrame->Combines3DTransformWithAncestors() || mFrame->Extend3DContext();
MOZ_ASSERT(isReference);
mTransform =
GetResultingTransformMatrix(mFrame, ToReferenceFrame(),
scale, INCLUDE_PERSPECTIVE|OFFSET_BY_ORIGIN);
}
}
return mTransform;
}
Matrix4x4
nsDisplayTransform::GetTransformForRendering()
{
if (!mFrame->HasPerspective() || mTransformGetter || mIsTransformSeparator) {
return GetTransform();
}
MOZ_ASSERT(!mTransformGetter);
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
// Don't include perspective transform, or the offset to origin, since
// nsDisplayPerspective will handle both of those.
return GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale, 0);
}
const Matrix4x4&
nsDisplayTransform::GetAccumulatedPreserved3DTransform(nsDisplayListBuilder* aBuilder)
{
MOZ_ASSERT(!mFrame->Extend3DContext() || IsLeafOf3DContext());
// XXX: should go back to fix mTransformGetter.
if (!mTransformPreserves3DInited) {
mTransformPreserves3DInited = true;
if (!IsLeafOf3DContext()) {
mTransformPreserves3D = GetTransform();
return mTransformPreserves3D;
}
const nsIFrame* establisher; // Establisher of the 3D rendering context.
for (establisher = mFrame;
establisher && establisher->Combines3DTransformWithAncestors();
establisher = nsLayoutUtils::GetCrossDocParentFrame(establisher)) {
}
establisher = nsLayoutUtils::GetCrossDocParentFrame(establisher);
const nsIFrame* establisherReference =
aBuilder->FindReferenceFrameFor(establisher);
nsPoint offset = mFrame->GetOffsetToCrossDoc(establisherReference);
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
uint32_t flags = INCLUDE_PRESERVE3D_ANCESTORS|INCLUDE_PERSPECTIVE|OFFSET_BY_ORIGIN;
mTransformPreserves3D =
GetResultingTransformMatrix(mFrame, offset, scale, flags);
}
return mTransformPreserves3D;
}
bool
nsDisplayTransform::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
// The visible rect of a Preserves-3D frame is just an intermediate
// result. It should always build a layer to make sure it is
// rendering correctly.
return ShouldPrerender(aBuilder) || mFrame->Combines3DTransformWithAncestors();
}
already_AddRefed<Layer> nsDisplayTransform::BuildLayer(nsDisplayListBuilder *aBuilder,
LayerManager *aManager,
const ContainerLayerParameters& aContainerParameters)
{
/* For frames without transform, it would not be removed for
* backface hidden here. But, it would be removed by the init
* function of nsDisplayTransform.
*/
const Matrix4x4& newTransformMatrix = GetTransformForRendering();
uint32_t flags = ShouldPrerender(aBuilder) ?
FrameLayerBuilder::CONTAINER_NOT_CLIPPED_BY_ANCESTORS : 0;
flags |= FrameLayerBuilder::CONTAINER_ALLOW_PULL_BACKGROUND_COLOR;
RefPtr<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->Extend3DContext() && !mNoExtendContext) {
container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_EXTEND_3D_CONTEXT);
} else {
container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_EXTEND_3D_CONTEXT);
}
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, mFrame,
eCSSProperty_transform);
if (ShouldPrerender(aBuilder)) {
if (MayBeAnimated(aBuilder)) {
// Only allow async updates to the transform if we're an animated layer, since that's what
// triggers us to set the correct AGR in the constructor and makes sure FrameLayerBuilder
// won't compute occlusions for this layer.
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();
}
bool
nsDisplayTransform::MayBeAnimated(nsDisplayListBuilder* aBuilder)
{
// Here we check if the *post-transform* bounds of this item are big enough
// to justify an active layer.
if (ActiveLayerTracker::IsStyleAnimated(aBuilder,
mFrame,
eCSSProperty_transform) ||
EffectCompositor::HasAnimationsForCompositor(mFrame,
eCSSProperty_transform)) {
if (!IsItemTooSmallForActiveLayer(this)) {
return true;
}
SetAnimationPerformanceWarningForTooSmallItem(this, eCSSProperty_transform);
}
return false;
}
nsDisplayItem::LayerState
nsDisplayTransform::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) {
// If the transform is 3d, the layer takes part in preserve-3d
// sorting, or the layer is a separator then we *always* want this
// to be an active layer.
if (!GetTransform().Is2D() || mFrame->Combines3DTransformWithAncestors() ||
mIsTransformSeparator) {
return LAYER_ACTIVE_FORCE;
}
if (MayBeAnimated(aBuilder)) {
// Returns LAYER_ACTIVE_FORCE to avoid flatterning the layer for async
// animations.
return LAYER_ACTIVE_FORCE;
}
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(), mAnimatedGeometryRootForChildren);
}
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(aBuilder) ||
!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)
{
if (aState->mInPreserves3D) {
mStoredList.HitTest(aBuilder, aRect, aState, aOutFrames);
return;
}
/* 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 = GetAccumulatedPreserved3DTransform(aBuilder);
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));
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 = matrix.ProjectRectBounds(originalRect, 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 = GetAccumulatedPreserved3DTransform(aBuilder);
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)));
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)
{
*aSnap = false;
if (mHasBounds) {
return mBounds;
}
if (mFrame->Extend3DContext() && !mIsTransformSeparator) {
return nsRect();
}
nsRect untransformedBounds = MaybePrerender() ?
mFrame->GetVisualOverflowRectRelativeToSelf() :
mStoredList.GetBounds(aBuilder, aSnap);
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
mBounds = nsLayoutUtils::MatrixTransformRect(untransformedBounds,
GetTransform(),
factor);
mHasBounds = true;
return mBounds;
}
void
nsDisplayTransform::ComputeBounds(nsDisplayListBuilder* aBuilder)
{
MOZ_ASSERT(mFrame->Extend3DContext() || IsLeafOf3DContext());
/* For some cases, the transform would make an empty bounds, but it
* may be turned back again to get a non-empty bounds. We should
* not depend on transforming bounds level by level.
*
* Here, it applies accumulated transforms on the leaf frames of the
* 3d rendering context, and track and accmulate bounds at
* nsDisplayListBuilder.
*/
nsDisplayListBuilder::AutoAccumulateTransform accTransform(aBuilder);
accTransform.Accumulate(GetTransform());
if (!IsLeafOf3DContext()) {
// Do not dive into another 3D context.
mStoredList.DoUpdateBoundsPreserves3D(aBuilder);
}
/* For Preserves3D, it is bounds of only children as leaf frames.
* For non-leaf frames, their bounds are accumulated and kept at
* nsDisplayListBuilder.
*/
bool snap;
nsRect untransformedBounds = MaybePrerender() ?
mFrame->GetVisualOverflowRectRelativeToSelf() :
mStoredList.GetBounds(aBuilder, &snap);
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
nsRect rect =
nsLayoutUtils::MatrixTransformRect(untransformedBounds,
accTransform.GetCurrentTransform(),
factor);
aBuilder->AccumulateRect(rect);
}
/* 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 (MaybePrerender() ||
!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(nsDisplayItem *aItem)
{
return false;
}
#else
bool
nsDisplayTransform::TryMerge(nsDisplayItem *aItem)
{
NS_PRECONDITION(aItem, "Why did you try merging with a null item?");
/* 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;
if (aItem->ScrollClip() != ScrollClip())
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,
bool aPreserves3D)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
uint32_t flags = INCLUDE_PERSPECTIVE|BASIS_AT_ORIGIN;
if (aPreserves3D) {
flags |= INCLUDE_PRESERVE3D_ANCESTORS;
}
return nsLayoutUtils::MatrixTransformRect
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, flags, aBoundsOverride),
factor);
}
bool nsDisplayTransform::UntransformRect(const nsRect &aTransformedBounds,
const nsRect &aChildBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
nsRect *aOutRect,
bool aPreserves3D)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
uint32_t flags = INCLUDE_PERSPECTIVE|BASIS_AT_ORIGIN;
if (aPreserves3D) {
flags |= INCLUDE_PRESERVE3D_ANCESTORS;
}
Matrix4x4 transform = GetResultingTransformMatrix(aFrame, aOrigin, factor, flags);
if (transform.IsSingular()) {
return false;
}
RectDouble result(NSAppUnitsToFloatPixels(aTransformedBounds.x, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.y, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.width, factor),
NSAppUnitsToFloatPixels(aTransformedBounds.height, factor));
RectDouble childGfxBounds(NSAppUnitsToFloatPixels(aChildBounds.x, factor),
NSAppUnitsToFloatPixels(aChildBounds.y, factor),
NSAppUnitsToFloatPixels(aChildBounds.width, factor),
NSAppUnitsToFloatPixels(aChildBounds.height, factor));
result = transform.Inverse().ProjectRectBounds(result, childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
return true;
}
bool nsDisplayTransform::UntransformVisibleRect(nsDisplayListBuilder* aBuilder,
nsRect *aOutRect)
{
const Matrix4x4& matrix = GetTransform();
if (matrix.IsSingular())
return false;
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
RectDouble 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);
RectDouble 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 = matrix.Inverse().ProjectRectBounds(result, childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
return true;
}
void
nsDisplayTransform::WriteDebugInfo(std::stringstream& aStream)
{
AppendToString(aStream, GetTransform());
if (IsTransformSeparator()) {
aStream << " transform-separator";
}
if (IsLeafOf3DContext()) {
aStream << " 3d-context-leaf";
}
if (mFrame->Extend3DContext()) {
aStream << " extends-3d-context";
}
if (mFrame->Combines3DTransformWithAncestors()) {
aStream << " combines-3d-with-ancestors";
}
}
nsDisplayPerspective::nsDisplayPerspective(nsDisplayListBuilder* aBuilder,
nsIFrame* aTransformFrame,
nsIFrame* aPerspectiveFrame,
nsDisplayList* aList)
: nsDisplayItem(aBuilder, aPerspectiveFrame)
, mList(aBuilder, aPerspectiveFrame, aList)
, mTransformFrame(aTransformFrame)
, mIndex(aBuilder->AllocatePerspectiveItemIndex())
{
MOZ_ASSERT(mList.GetChildren()->Count() == 1);
MOZ_ASSERT(mList.GetChildren()->GetTop()->GetType() == TYPE_TRANSFORM);
}
already_AddRefed<Layer>
nsDisplayPerspective::BuildLayer(nsDisplayListBuilder *aBuilder,
LayerManager *aManager,
const ContainerLayerParameters& aContainerParameters)
{
float appUnitsPerPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 perspectiveMatrix;
DebugOnly<bool> hasPerspective =
nsDisplayTransform::ComputePerspectiveMatrix(mTransformFrame, appUnitsPerPixel,
perspectiveMatrix);
MOZ_ASSERT(hasPerspective, "Why did we create nsDisplayPerspective?");
/*
* ClipListToRange can remove our child after we were created.
*/
if (!mList.GetChildren()->GetTop()) {
return nullptr;
}
/*
* The resulting matrix is still in the coordinate space of the transformed
* frame. Append a translation to the reference frame coordinates.
*/
nsDisplayTransform* transform =
static_cast<nsDisplayTransform*>(mList.GetChildren()->GetTop());
Point3D newOrigin =
Point3D(NSAppUnitsToFloatPixels(transform->ToReferenceFrame().x, appUnitsPerPixel),
NSAppUnitsToFloatPixels(transform->ToReferenceFrame().y, appUnitsPerPixel),
0.0f);
Point3D roundedOrigin(NS_round(newOrigin.x),
NS_round(newOrigin.y),
0);
perspectiveMatrix.PostTranslate(roundedOrigin);
RefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList.GetChildren(),
aContainerParameters, &perspectiveMatrix, 0);
if (!container) {
return nullptr;
}
// Sort of a lie, but we want to pretend that the perspective layer extends a 3d context
// so that it gets its transform combined with children. Might need a better name that reflects
// this use case and isn't specific to preserve-3d.
container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_EXTEND_3D_CONTEXT);
container->SetTransformIsPerspective(true);
return container.forget();
}
LayerState
nsDisplayPerspective::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
return LAYER_ACTIVE_FORCE;
}
int32_t
nsDisplayPerspective::ZIndex() const
{
return ZIndexForFrame(mTransformFrame);
}
nsDisplayItemGeometry*
nsCharClipDisplayItem::AllocateGeometry(nsDisplayListBuilder* aBuilder)
{
return new nsCharClipGeometry(this, aBuilder);
}
void
nsCharClipDisplayItem::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsCharClipGeometry* geometry = static_cast<const nsCharClipGeometry*>(aGeometry);
bool snap;
nsRect newRect = geometry->mBounds;
nsRect oldRect = GetBounds(aBuilder, &snap);
if (mVisIStartEdge != geometry->mVisIStartEdge ||
mVisIEndEdge != geometry->mVisIEndEdge ||
!oldRect.IsEqualInterior(newRect) ||
!geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
aInvalidRegion->Or(oldRect, newRect);
}
}
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
nsDisplayVR::nsDisplayVR(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsDisplayList* aList, mozilla::gfx::VRDeviceProxy* aHMD)
: nsDisplayOwnLayer(aBuilder, aFrame, aList)
, mHMD(aHMD)
{
}
already_AddRefed<Layer>
nsDisplayVR::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
ContainerLayerParameters newContainerParameters = aContainerParameters;
uint32_t flags = FrameLayerBuilder::CONTAINER_NOT_CLIPPED_BY_ANCESTORS |
FrameLayerBuilder::CONTAINER_ALLOW_PULL_BACKGROUND_COLOR;
RefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, &mList,
newContainerParameters, nullptr, flags);
container->SetVRDeviceID(mHMD->GetDeviceInfo().GetDeviceID());
container->SetInputFrameID(mHMD->GetSensorState().inputFrameID);
container->SetUserData(nsIFrame::LayerIsPrerenderedDataKey(),
/*the value is irrelevant*/nullptr);
return container.forget();
}
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)
{
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
nsSVGIntegrationUtils::PaintFramesWithEffects(*aCtx->ThebesContext(), mFrame,
mVisibleRect,
borderArea,
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()->IsSVGElement()) {
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->StyleEffects()->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);
if (!isOK) {
return nullptr;
}
ContainerLayerParameters newContainerParameters = aContainerParameters;
if (effectProperties.HasValidFilter()) {
newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true;
}
RefPtr<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(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;
if (aItem->ScrollClip() != ScrollClip())
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->StyleEffects()->mOpacity != 1.0f) {
first = false;
aTo += nsPrintfCString("opacity(%f)", mFrame->StyleEffects()->mOpacity);
}
if (clipPathFrame) {
if (!first) {
aTo += ", ";
}
aTo += nsPrintfCString("clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial");
first = false;
}
const nsStyleSVGReset *style = mFrame->StyleSVGReset();
if (style->HasClipPath() && !clipPathFrame) {
if (!first) {
aTo += ", ";
}
aTo += "clip(basic-shape)";
first = false;
}
if (effectProperties.HasValidFilter()) {
if (!first) {
aTo += ", ";
}
aTo += "filter";
first = false;
}
if (effectProperties.GetMaskFrame(&isOK)) {
if (!first) {
aTo += ", ";
}
aTo += "mask";
}
aTo += ")";
}
#endif