diff -r 000000000000 -r 6474c204b198 layout/base/nsDisplayList.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/layout/base/nsDisplayList.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,5347 @@ +/* -*- 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 "mozilla/dom/TabChild.h" +#include "mozilla/layers/PLayerTransaction.h" + +#include "nsDisplayList.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 "nsSVGIntegrationUtils.h" +#include "nsLayoutUtils.h" +#include "nsIScrollableFrame.h" +#include "nsIFrameInlines.h" +#include "nsThemeConstants.h" +#include "LayerTreeInvalidation.h" + +#include "imgIContainer.h" +#include "BasicLayers.h" +#include "nsBoxFrame.h" +#include "nsViewportFrame.h" +#include "nsSubDocumentFrame.h" +#include "nsSVGEffects.h" +#include "nsSVGElement.h" +#include "nsSVGClipPathFrame.h" +#include "GeckoProfiler.h" +#include "nsAnimationManager.h" +#include "nsTransitionManager.h" +#include "nsViewManager.h" +#include "ImageLayers.h" +#include "ImageContainer.h" +#include "nsCanvasFrame.h" +#include "StickyScrollContainer.h" +#include "mozilla/EventStates.h" +#include "mozilla/LookAndFeel.h" +#include "mozilla/Preferences.h" +#include "ActiveLayerTracker.h" +#include "nsContentUtils.h" +#include "nsPrintfCString.h" +#include "UnitTransforms.h" + +#include +#include + +using namespace mozilla; +using namespace mozilla::css; +using namespace mozilla::layers; +using namespace mozilla::dom; +typedef FrameMetrics::ViewID ViewID; + +static inline nsIFrame* +GetTransformRootFrame(nsIFrame* aFrame) +{ + return nsLayoutUtils::GetTransformRootFrame(aFrame); +} + +static void AddTransformFunctions(nsCSSValueList* aList, + nsStyleContext* aContext, + nsPresContext* aPresContext, + nsRect& aBounds, + float aAppUnitsPerPixel, + InfallibleTArray& aFunctions) +{ + if (aList->mValue.GetUnit() == eCSSUnit_None) { + return; + } + + for (const nsCSSValueList* curr = aList; curr; curr = curr->mNext) { + const nsCSSValue& currElem = curr->mValue; + NS_ASSERTION(currElem.GetUnit() == eCSSUnit_Function, + "Stream should consist solely of functions!"); + nsCSSValue::Array* array = currElem.GetArrayValue(); + bool canStoreInRuleTree = true; + switch (nsStyleTransformMatrix::TransformFunctionOf(array)) { + case eCSSKeyword_rotatex: + { + double theta = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(RotationX(theta)); + break; + } + case eCSSKeyword_rotatey: + { + double theta = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(RotationY(theta)); + break; + } + case eCSSKeyword_rotatez: + { + double theta = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(RotationZ(theta)); + break; + } + case eCSSKeyword_rotate: + { + double theta = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(Rotation(theta)); + break; + } + case eCSSKeyword_rotate3d: + { + double x = array->Item(1).GetFloatValue(); + double y = array->Item(2).GetFloatValue(); + double z = array->Item(3).GetFloatValue(); + double theta = array->Item(4).GetAngleValueInRadians(); + aFunctions.AppendElement(Rotation3D(x, y, z, theta)); + break; + } + case eCSSKeyword_scalex: + { + double x = array->Item(1).GetFloatValue(); + aFunctions.AppendElement(Scale(x, 1, 1)); + break; + } + case eCSSKeyword_scaley: + { + double y = array->Item(1).GetFloatValue(); + aFunctions.AppendElement(Scale(1, y, 1)); + break; + } + case eCSSKeyword_scalez: + { + double z = array->Item(1).GetFloatValue(); + aFunctions.AppendElement(Scale(1, 1, z)); + break; + } + case eCSSKeyword_scale: + { + double x = array->Item(1).GetFloatValue(); + // scale(x) is shorthand for scale(x, x); + double y = array->Count() == 2 ? x : array->Item(2).GetFloatValue(); + aFunctions.AppendElement(Scale(x, y, 1)); + break; + } + case eCSSKeyword_scale3d: + { + double x = array->Item(1).GetFloatValue(); + double y = array->Item(2).GetFloatValue(); + double z = array->Item(3).GetFloatValue(); + aFunctions.AppendElement(Scale(x, y, z)); + break; + } + case eCSSKeyword_translatex: + { + double x = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(1), aContext, aPresContext, canStoreInRuleTree, + aBounds.Width(), aAppUnitsPerPixel); + aFunctions.AppendElement(Translation(x, 0, 0)); + break; + } + case eCSSKeyword_translatey: + { + double y = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(1), aContext, aPresContext, canStoreInRuleTree, + aBounds.Height(), aAppUnitsPerPixel); + aFunctions.AppendElement(Translation(0, y, 0)); + break; + } + case eCSSKeyword_translatez: + { + double z = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(1), aContext, aPresContext, canStoreInRuleTree, + 0, aAppUnitsPerPixel); + aFunctions.AppendElement(Translation(0, 0, z)); + break; + } + case eCSSKeyword_translate: + { + double x = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(1), aContext, aPresContext, canStoreInRuleTree, + aBounds.Width(), aAppUnitsPerPixel); + // translate(x) is shorthand for translate(x, 0) + double y = 0; + if (array->Count() == 3) { + y = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(2), aContext, aPresContext, canStoreInRuleTree, + aBounds.Height(), aAppUnitsPerPixel); + } + aFunctions.AppendElement(Translation(x, y, 0)); + break; + } + case eCSSKeyword_translate3d: + { + double x = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(1), aContext, aPresContext, canStoreInRuleTree, + aBounds.Width(), aAppUnitsPerPixel); + double y = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(2), aContext, aPresContext, canStoreInRuleTree, + aBounds.Height(), aAppUnitsPerPixel); + double z = nsStyleTransformMatrix::ProcessTranslatePart( + array->Item(3), aContext, aPresContext, canStoreInRuleTree, + 0, aAppUnitsPerPixel); + + aFunctions.AppendElement(Translation(x, y, z)); + break; + } + case eCSSKeyword_skewx: + { + double x = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(SkewX(x)); + break; + } + case eCSSKeyword_skewy: + { + double y = array->Item(1).GetAngleValueInRadians(); + aFunctions.AppendElement(SkewY(y)); + break; + } + case eCSSKeyword_skew: + { + double x = array->Item(1).GetAngleValueInRadians(); + // skew(x) is shorthand for skew(x, 0) + double y = 0; + if (array->Count() == 3) { + y = array->Item(2).GetAngleValueInRadians(); + } + aFunctions.AppendElement(Skew(x, y)); + break; + } + case eCSSKeyword_matrix: + { + gfx::Matrix4x4 matrix; + matrix._11 = array->Item(1).GetFloatValue(); + matrix._12 = array->Item(2).GetFloatValue(); + matrix._13 = 0; + matrix._14 = 0; + matrix._21 = array->Item(3).GetFloatValue(); + matrix._22 = array->Item(4).GetFloatValue(); + matrix._23 = 0; + matrix._24 = 0; + matrix._31 = 0; + matrix._32 = 0; + matrix._33 = 1; + matrix._34 = 0; + matrix._41 = array->Item(5).GetFloatValue(); + matrix._42 = array->Item(6).GetFloatValue(); + matrix._43 = 0; + matrix._44 = 1; + aFunctions.AppendElement(TransformMatrix(matrix)); + break; + } + case eCSSKeyword_matrix3d: + { + gfx::Matrix4x4 matrix; + matrix._11 = array->Item(1).GetFloatValue(); + matrix._12 = array->Item(2).GetFloatValue(); + matrix._13 = array->Item(3).GetFloatValue(); + matrix._14 = array->Item(4).GetFloatValue(); + matrix._21 = array->Item(5).GetFloatValue(); + matrix._22 = array->Item(6).GetFloatValue(); + matrix._23 = array->Item(7).GetFloatValue(); + matrix._24 = array->Item(8).GetFloatValue(); + matrix._31 = array->Item(9).GetFloatValue(); + matrix._32 = array->Item(10).GetFloatValue(); + matrix._33 = array->Item(11).GetFloatValue(); + matrix._34 = array->Item(12).GetFloatValue(); + matrix._41 = array->Item(13).GetFloatValue(); + matrix._42 = array->Item(14).GetFloatValue(); + matrix._43 = array->Item(15).GetFloatValue(); + matrix._44 = array->Item(16).GetFloatValue(); + aFunctions.AppendElement(TransformMatrix(matrix)); + break; + } + case eCSSKeyword_interpolatematrix: + { + gfx3DMatrix matrix; + nsStyleTransformMatrix::ProcessInterpolateMatrix(matrix, array, + aContext, + aPresContext, + canStoreInRuleTree, + aBounds, + aAppUnitsPerPixel); + gfx::Matrix4x4 transform; + gfx::ToMatrix4x4(matrix, transform); + aFunctions.AppendElement(TransformMatrix(transform)); + break; + } + case eCSSKeyword_perspective: + { + aFunctions.AppendElement(Perspective(array->Item(1).GetFloatValue())); + break; + } + default: + NS_ERROR("Function not handled yet!"); + } + } +} + +static TimingFunction +ToTimingFunction(css::ComputedTimingFunction& aCTF) +{ + if (aCTF.GetType() == nsTimingFunction::Function) { + const nsSMILKeySpline* spline = aCTF.GetFunction(); + return TimingFunction(CubicBezierFunction(spline->X1(), spline->Y1(), + spline->X2(), spline->Y2())); + } + + uint32_t type = aCTF.GetType() == nsTimingFunction::StepStart ? 1 : 2; + return TimingFunction(StepFunction(aCTF.GetSteps(), type)); +} + +static void +AddAnimationForProperty(nsIFrame* aFrame, nsCSSProperty aProperty, + mozilla::StyleAnimation* ea, Layer* aLayer, + AnimationData& aData, bool aPending) +{ + NS_ASSERTION(aLayer->AsContainerLayer(), "Should only animate ContainerLayer"); + nsStyleContext* styleContext = aFrame->StyleContext(); + nsPresContext* presContext = aFrame->PresContext(); + nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(aFrame); + // all data passed directly to the compositor should be in css pixels + float scale = nsDeviceContext::AppUnitsPerCSSPixel(); + + mozilla::layers::Animation* animation = + aPending ? + aLayer->AddAnimationForNextTransaction() : + aLayer->AddAnimation(); + + animation->startTime() = ea->mStartTime + ea->mDelay; + animation->duration() = ea->mIterationDuration; + animation->numIterations() = + ea->mIterationCount != NS_IEEEPositiveInfinity() ? ea->mIterationCount : -1; + animation->direction() = ea->mDirection; + animation->property() = aProperty; + animation->data() = aData; + + for (uint32_t propIdx = 0; propIdx < ea->mProperties.Length(); propIdx++) { + AnimationProperty* property = &ea->mProperties[propIdx]; + + if (aProperty != property->mProperty) { + continue; + } + + for (uint32_t segIdx = 0; segIdx < property->mSegments.Length(); segIdx++) { + AnimationPropertySegment* segment = &property->mSegments[segIdx]; + + AnimationSegment* animSegment = animation->segments().AppendElement(); + if (aProperty == eCSSProperty_transform) { + animSegment->startState() = InfallibleTArray(); + animSegment->endState() = InfallibleTArray(); + + nsCSSValueSharedList* list = segment->mFromValue.GetCSSValueSharedListValue(); + AddTransformFunctions(list->mHead, styleContext, presContext, bounds, scale, + animSegment->startState().get_ArrayOfTransformFunction()); + + list = segment->mToValue.GetCSSValueSharedListValue(); + AddTransformFunctions(list->mHead, styleContext, presContext, bounds, scale, + animSegment->endState().get_ArrayOfTransformFunction()); + } else if (aProperty == eCSSProperty_opacity) { + animSegment->startState() = segment->mFromValue.GetFloatValue(); + animSegment->endState() = segment->mToValue.GetFloatValue(); + } + + animSegment->startPortion() = segment->mFromKey; + animSegment->endPortion() = segment->mToKey; + animSegment->sampleFn() = ToTimingFunction(segment->mTimingFunction); + } + } +} + +template +static void +AddAnimationsForProperty(nsIFrame* aFrame, nsCSSProperty aProperty, + nsTArray& aAnimations, + Layer* aLayer, AnimationData& aData, + bool aPending) { + mozilla::TimeStamp currentTime = + aFrame->PresContext()->RefreshDriver()->MostRecentRefresh(); + for (uint32_t animIdx = 0; animIdx < aAnimations.Length(); animIdx++) { + mozilla::StyleAnimation* anim = &aAnimations[animIdx]; + if (!(anim->HasAnimationOfProperty(aProperty) && + anim->IsRunningAt(currentTime))) { + continue; + } + AddAnimationForProperty(aFrame, aProperty, anim, aLayer, aData, aPending); + anim->mIsRunningOnCompositor = true; + } +} + +/* static */ void +nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(Layer* aLayer, + nsDisplayListBuilder* aBuilder, + nsDisplayItem* aItem, + nsIFrame* aFrame, + nsCSSProperty aProperty) +{ + // This function can be called in two ways: from + // nsDisplay*::BuildLayer while constructing a layer (with all + // pointers non-null), or from RestyleManager's handling of + // UpdateOpacityLayer/UpdateTransformLayer hints. + MOZ_ASSERT(!aBuilder == !aItem, + "should only be called in two configurations, with both " + "aBuilder and aItem, or with neither"); + MOZ_ASSERT(!aItem || aFrame == aItem->Frame(), "frame mismatch"); + + bool pending = !aBuilder; + + if (pending) { + aLayer->ClearAnimationsForNextTransaction(); + } else { + aLayer->ClearAnimations(); + } + + nsIContent* content = aFrame->GetContent(); + if (!content) { + return; + } + ElementTransitions* et = + nsTransitionManager::GetTransitionsForCompositor(content, aProperty); + + ElementAnimations* ea = + nsAnimationManager::GetAnimationsForCompositor(content, aProperty); + + if (!ea && !et) { + return; + } + + // If the frame is not prerendered, bail out. + // Do this check only during layer construction; during updating the + // caller is required to check it appropriately. + if (aItem && !aItem->CanUseAsyncAnimations(aBuilder)) { + // AnimationManager or TransitionManager need to know that we refused to + // run this animation asynchronously so that they will not throttle the + // main thread animation. + aFrame->Properties().Set(nsIFrame::RefusedAsyncAnimation(), + reinterpret_cast(intptr_t(true))); + + // We need to schedule another refresh driver run so that AnimationManager + // or TransitionManager get a chance to unthrottle the animation. + aFrame->SchedulePaint(); + return; + } + + AnimationData data; + if (aProperty == eCSSProperty_transform) { + nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(aFrame); + // all data passed directly to the compositor should be in css pixels + float scale = nsDeviceContext::AppUnitsPerCSSPixel(); + gfxPoint3D offsetToTransformOrigin = + nsDisplayTransform::GetDeltaToTransformOrigin(aFrame, scale, &bounds); + gfxPoint3D offsetToPerspectiveOrigin = + nsDisplayTransform::GetDeltaToPerspectiveOrigin(aFrame, scale); + nscoord perspective = 0.0; + nsStyleContext* parentStyleContext = aFrame->StyleContext()->GetParent(); + if (parentStyleContext) { + const nsStyleDisplay* disp = parentStyleContext->StyleDisplay(); + if (disp && disp->mChildPerspective.GetUnit() == eStyleUnit_Coord) { + perspective = disp->mChildPerspective.GetCoordValue(); + } + } + nsPoint origin; + if (aItem) { + origin = aItem->ToReferenceFrame(); + } else { + // transform display items used a reference frame computed from + // their GetTransformRootFrame(). + nsIFrame* referenceFrame = + nsLayoutUtils::GetReferenceFrame(GetTransformRootFrame(aFrame)); + origin = aFrame->GetOffsetToCrossDoc(referenceFrame); + } + + data = TransformData(origin, offsetToTransformOrigin, + offsetToPerspectiveOrigin, bounds, perspective, + aFrame->PresContext()->AppUnitsPerDevPixel()); + } else if (aProperty == eCSSProperty_opacity) { + data = null_t(); + } + + if (et) { + AddAnimationsForProperty(aFrame, aProperty, et->mPropertyTransitions, + aLayer, data, pending); + aLayer->SetAnimationGeneration(et->mAnimationGeneration); + } + + if (ea) { + AddAnimationsForProperty(aFrame, aProperty, ea->mAnimations, + aLayer, data, pending); + aLayer->SetAnimationGeneration(ea->mAnimationGeneration); + } +} + +nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame, + Mode aMode, bool aBuildCaret) + : mReferenceFrame(aReferenceFrame), + mIgnoreScrollFrame(nullptr), + mLayerEventRegions(nullptr), + mCurrentTableItem(nullptr), + mFinalTransparentRegion(nullptr), + mCachedOffsetFrame(aReferenceFrame), + mCachedReferenceFrame(aReferenceFrame), + mCachedOffset(0, 0), + mGlassDisplayItem(nullptr), + mMode(aMode), + mCurrentScrollParentId(FrameMetrics::NULL_SCROLL_ID), + mBuildCaret(aBuildCaret), + mIgnoreSuppression(false), + mHadToIgnoreSuppression(false), + mIsAtRootOfPseudoStackingContext(false), + mIncludeAllOutOfFlows(false), + mDescendIntoSubdocuments(true), + mSelectedFramesOnly(false), + mAccurateVisibleRegions(false), + mAllowMergingAndFlattening(true), + mWillComputePluginGeometry(false), + mInTransform(false), + mInFixedPos(false), + mSyncDecodeImages(false), + mIsPaintingToWindow(false), + mIsCompositingCheap(false), + mContainsPluginItem(false), + mContainsBlendMode(false), + mAncestorHasTouchEventHandler(false), + mHaveScrollableDisplayPort(false) +{ + MOZ_COUNT_CTOR(nsDisplayListBuilder); + PL_InitArenaPool(&mPool, "displayListArena", 1024, + std::max(NS_ALIGNMENT_OF(void*),NS_ALIGNMENT_OF(double))-1); + + nsPresContext* pc = aReferenceFrame->PresContext(); + nsIPresShell *shell = pc->PresShell(); + if (pc->IsRenderingOnlySelection()) { + nsCOMPtr selcon(do_QueryInterface(shell)); + if (selcon) { + selcon->GetSelection(nsISelectionController::SELECTION_NORMAL, + getter_AddRefs(mBoundingSelection)); + } + } + + nsCSSRendering::BeginFrameTreesLocked(); + PR_STATIC_ASSERT(nsDisplayItem::TYPE_MAX < (1 << nsDisplayItem::TYPE_BITS)); +} + +static void MarkFrameForDisplay(nsIFrame* aFrame, nsIFrame* aStopAtFrame) { + for (nsIFrame* f = aFrame; f; + f = nsLayoutUtils::GetParentOrPlaceholderFor(f)) { + if (f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) + return; + f->AddStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO); + if (f == aStopAtFrame) { + // we've reached a frame that we know will be painted, so we can stop. + break; + } + } +} + +void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame, + nsIFrame* aFrame, + const nsRect& aDirtyRect) +{ + nsRect dirtyRectRelativeToDirtyFrame = aDirtyRect; + if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(aFrame)) { + NS_ASSERTION(aDirtyFrame == aFrame->GetParent(), "Dirty frame should be viewport frame"); + // position: fixed items are reflowed into and only drawn inside the + // viewport, or the scroll position clamping scrollport size, if one is + // set. + nsIPresShell* ps = aFrame->PresContext()->PresShell(); + dirtyRectRelativeToDirtyFrame.MoveTo(0, 0); + if (ps->IsScrollPositionClampingScrollPortSizeSet()) { + dirtyRectRelativeToDirtyFrame.SizeTo(ps->GetScrollPositionClampingScrollPortSize()); + } else { + dirtyRectRelativeToDirtyFrame.SizeTo(aDirtyFrame->GetSize()); + } + } + + nsRect dirty = dirtyRectRelativeToDirtyFrame - aFrame->GetOffsetTo(aDirtyFrame); + nsRect overflowRect = aFrame->GetVisualOverflowRect(); + + if (aFrame->IsTransformed() && + nsLayoutUtils::HasAnimationsForCompositor(aFrame->GetContent(), + eCSSProperty_transform)) { + /** + * Add a fuzz factor to the overflow rectangle so that elements only just + * out of view are pulled into the display list, so they can be + * prerendered if necessary. + */ + overflowRect.Inflate(nsPresContext::CSSPixelsToAppUnits(32)); + } + + if (!dirty.IntersectRect(dirty, overflowRect)) + return; + const DisplayItemClip* clip = mClipState.GetClipForContainingBlockDescendants(); + OutOfFlowDisplayData* data = clip ? new OutOfFlowDisplayData(*clip, dirty) + : new OutOfFlowDisplayData(dirty); + aFrame->Properties().Set(nsDisplayListBuilder::OutOfFlowDisplayDataProperty(), data); + + MarkFrameForDisplay(aFrame, aDirtyFrame); +} + +static void UnmarkFrameForDisplay(nsIFrame* aFrame) { + nsPresContext* presContext = aFrame->PresContext(); + presContext->PropertyTable()-> + Delete(aFrame, nsDisplayListBuilder::OutOfFlowDisplayDataProperty()); + + for (nsIFrame* f = aFrame; f; + f = nsLayoutUtils::GetParentOrPlaceholderFor(f)) { + if (!(f->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) + return; + f->RemoveStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO); + } +} + +static bool gPrintApzcTree = false; + +static bool GetApzcTreePrintPref() { + static bool initialized = false; + if (!initialized) { + Preferences::AddBoolVarCache(&gPrintApzcTree, "apz.printtree", gPrintApzcTree); + initialized = true; + } + return gPrintApzcTree; +} + +static void RecordFrameMetrics(nsIFrame* aForFrame, + nsIFrame* aScrollFrame, + const nsIFrame* aReferenceFrame, + ContainerLayer* aRoot, + const nsRect& aVisibleRect, + const nsRect& aViewport, + nsRect* aDisplayPort, + nsRect* aCriticalDisplayPort, + ViewID aScrollId, + bool aIsRoot, + const ContainerLayerParameters& aContainerParameters) { + nsPresContext* presContext = aForFrame->PresContext(); + int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel(); + LayoutDeviceToLayerScale resolution(aContainerParameters.mXScale, aContainerParameters.mYScale); + + nsIntRect visible = aVisibleRect.ScaleToNearestPixels( + resolution.scale, resolution.scale, auPerDevPixel); + aRoot->SetVisibleRegion(visible); + + FrameMetrics metrics; + metrics.mViewport = CSSRect::FromAppUnits(aViewport); + if (aDisplayPort) { + metrics.mDisplayPort = CSSRect::FromAppUnits(*aDisplayPort); + if (aCriticalDisplayPort) { + metrics.mCriticalDisplayPort = CSSRect::FromAppUnits(*aCriticalDisplayPort); + } + } + + nsIScrollableFrame* scrollableFrame = nullptr; + if (aScrollFrame) + scrollableFrame = aScrollFrame->GetScrollTargetFrame(); + + metrics.mScrollableRect = CSSRect::FromAppUnits( + nsLayoutUtils::CalculateScrollableRectForFrame(scrollableFrame, aForFrame)); + + if (scrollableFrame) { + nsPoint scrollPosition = scrollableFrame->GetScrollPosition(); + metrics.SetScrollOffset(CSSPoint::FromAppUnits(scrollPosition)); + + // If the frame was scrolled since the last layers update, and by + // something other than the APZ code, we want to tell the APZ to update + // its scroll offset. + nsIAtom* originOfLastScroll = scrollableFrame->OriginOfLastScroll(); + if (originOfLastScroll && originOfLastScroll != nsGkAtoms::apz) { + metrics.SetScrollOffsetUpdated(scrollableFrame->CurrentScrollGeneration()); + } + } + + metrics.SetScrollId(aScrollId); + metrics.mIsRoot = aIsRoot; + + // Only the root scrollable frame for a given presShell should pick up + // the presShell's resolution. All the other frames are 1.0. + nsIPresShell* presShell = presContext->GetPresShell(); + if (aScrollFrame == presShell->GetRootScrollFrame()) { + metrics.mResolution = ParentLayerToLayerScale(presShell->GetXResolution(), + presShell->GetYResolution()); + } else { + metrics.mResolution = ParentLayerToLayerScale(1.0f); + } + + // For the cumulateive resolution, multiply the resolutions of all the + // presShells back up to the root + metrics.mCumulativeResolution = LayoutDeviceToLayerScale(1.0f); + nsIPresShell* curPresShell = presShell; + while (curPresShell != nullptr) { + ParentLayerToLayerScale presShellResolution(curPresShell->GetXResolution(), + curPresShell->GetYResolution()); + metrics.mCumulativeResolution.scale *= presShellResolution.scale; + nsPresContext* parentContext = curPresShell->GetPresContext()->GetParentPresContext(); + curPresShell = parentContext ? parentContext->GetPresShell() : nullptr; + } + + metrics.mDevPixelsPerCSSPixel = CSSToLayoutDeviceScale( + (float)nsPresContext::AppUnitsPerCSSPixel() / auPerDevPixel); + + // Initially, AsyncPanZoomController should render the content to the screen + // at the painted resolution. + const LayerToScreenScale layerToScreenScale(1.0f); + metrics.SetZoom(metrics.mCumulativeResolution * metrics.mDevPixelsPerCSSPixel + * layerToScreenScale); + + if (presShell) { + nsIDocument* document = nullptr; + document = presShell->GetDocument(); + if (document) { + nsCOMPtr innerWin(document->GetInnerWindow()); + if (innerWin) { + metrics.mMayHaveTouchListeners = innerWin->HasTouchEventListeners(); + } + } + } + + LayoutDeviceToParentLayerScale layoutToParentLayerScale = + // The ScreenToParentLayerScale should be mTransformScale which is not calculated yet, + // but we don't yet handle CSS transforms, so we assume it's 1 here. + metrics.mCumulativeResolution * LayerToScreenScale(1.0) * ScreenToParentLayerScale(1.0); + + // Calculate the composition bounds as the size of the scroll frame and + // its origin relative to the reference frame. + // If aScrollFrame is null, we are in a document without a root scroll frame, + // so it's a xul document. In this case, use the size of the viewport frame. + nsIFrame* frameForCompositionBoundsCalculation = aScrollFrame ? aScrollFrame : aForFrame; + nsRect compositionBounds(frameForCompositionBoundsCalculation->GetOffsetToCrossDoc(aReferenceFrame), + frameForCompositionBoundsCalculation->GetSize()); + metrics.mCompositionBounds = RoundedToInt(LayoutDeviceRect::FromAppUnits(compositionBounds, auPerDevPixel) + * layoutToParentLayerScale); + + + // For the root scroll frame of the root content document, the above calculation + // will yield the size of the viewport frame as the composition bounds, which + // doesn't actually correspond to what is visible when + // nsIDOMWindowUtils::setCSSViewport has been called to modify the visible area of + // the prescontext that the viewport frame is reflowed into. In that case if our + // document has a widget then the widget's bounds will correspond to what is + // visible. If we don't have a widget the root view's bounds correspond to what + // would be visible because they don't get modified by setCSSViewport. + bool isRootContentDocRootScrollFrame = presContext->IsRootContentDocument() + && aScrollFrame == presShell->GetRootScrollFrame(); + if (isRootContentDocRootScrollFrame) { + if (nsIFrame* rootFrame = presShell->GetRootFrame()) { + if (nsView* view = rootFrame->GetView()) { + nsRect viewBoundsAppUnits = view->GetBounds() + rootFrame->GetOffsetToCrossDoc(aReferenceFrame); + ParentLayerIntRect viewBounds = RoundedToInt(LayoutDeviceRect::FromAppUnits(viewBoundsAppUnits, auPerDevPixel) + * layoutToParentLayerScale); + + // On Android, we need to do things a bit differently to get things + // right (see bug 983208, bug 988882). We use the bounds of the nearest + // widget, but clamp the height to the view bounds height. This clamping + // is done to get correct results for a page where the page is sized to + // the screen and thus the dynamic toolbar never disappears. In such a + // case, we want the composition bounds to exclude the toolbar height, + // but the widget bounds includes it. We don't currently have a good way + // of knowing about the toolbar height, but clamping to the view bounds + // height gives the correct answer in the cases we care about. + nsIWidget* widget = +#ifdef MOZ_WIDGET_ANDROID + rootFrame->GetNearestWidget(); +#else + view->GetWidget(); +#endif + if (widget) { + nsIntRect widgetBounds; + widget->GetBounds(widgetBounds); + metrics.mCompositionBounds = ViewAs(widgetBounds); +#ifdef MOZ_WIDGET_ANDROID + if (viewBounds.height < metrics.mCompositionBounds.height) { + metrics.mCompositionBounds.height = viewBounds.height; + } +#endif + } else { + metrics.mCompositionBounds = viewBounds; + } + } + } + } + + // Adjust composition bounds for the size of scroll bars. + if (scrollableFrame && !LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) { + nsMargin sizes = scrollableFrame->GetActualScrollbarSizes(); + // Scrollbars are not subject to scaling, so CSS pixels = layer pixels for them. + ParentLayerIntMargin boundMargins = RoundedToInt(CSSMargin::FromAppUnits(sizes) * CSSToParentLayerScale(1.0f)); + metrics.mCompositionBounds.Deflate(boundMargins); + } + + metrics.SetRootCompositionSize( + nsLayoutUtils::CalculateRootCompositionSize(aScrollFrame ? aScrollFrame : aForFrame, + isRootContentDocRootScrollFrame, metrics)); + + if (GetApzcTreePrintPref()) { + if (nsIContent* content = frameForCompositionBoundsCalculation->GetContent()) { + nsAutoString contentDescription; + content->Describe(contentDescription); + metrics.SetContentDescription(NS_LossyConvertUTF16toASCII(contentDescription).get()); + } + } + + metrics.mPresShellId = presShell->GetPresShellId(); + + // If the scroll frame's content is marked 'scrollgrab', record this + // in the FrameMetrics so APZ knows to provide the scroll grabbing + // behaviour. + if (aScrollFrame && nsContentUtils::HasScrollgrab(aScrollFrame->GetContent())) { + metrics.mHasScrollgrab = true; + } + + aRoot->SetFrameMetrics(metrics); +} + +nsDisplayListBuilder::~nsDisplayListBuilder() { + NS_ASSERTION(mFramesMarkedForDisplay.Length() == 0, + "All frames should have been unmarked"); + NS_ASSERTION(mPresShellStates.Length() == 0, + "All presshells should have been exited"); + NS_ASSERTION(!mCurrentTableItem, "No table item should be active"); + + nsCSSRendering::EndFrameTreesLocked(); + + for (uint32_t i = 0; i < mDisplayItemClipsToDestroy.Length(); ++i) { + mDisplayItemClipsToDestroy[i]->DisplayItemClip::~DisplayItemClip(); + } + + PL_FinishArenaPool(&mPool); + MOZ_COUNT_DTOR(nsDisplayListBuilder); +} + +uint32_t +nsDisplayListBuilder::GetBackgroundPaintFlags() { + uint32_t flags = 0; + if (mSyncDecodeImages) { + flags |= nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES; + } + if (mIsPaintingToWindow) { + flags |= nsCSSRendering::PAINTBG_TO_WINDOW; + } + return flags; +} + +void +nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion, + const nsRegion& aRegion) +{ + if (aRegion.IsEmpty()) + return; + + nsRegion tmp; + tmp.Sub(*aVisibleRegion, aRegion); + // Don't let *aVisibleRegion get too complex, but don't let it fluff out + // to its bounds either, which can be very bad (see bug 516740). + // Do let aVisibleRegion get more complex if by doing so we reduce its + // area by at least half. + if (GetAccurateVisibleRegions() || tmp.GetNumRects() <= 15 || + tmp.Area() <= aVisibleRegion->Area()/2) { + *aVisibleRegion = tmp; + } +} + +nsCaret * +nsDisplayListBuilder::GetCaret() { + nsRefPtr caret = CurrentPresShellState()->mPresShell->GetCaret(); + return caret; +} + +void +nsDisplayListBuilder::EnterPresShell(nsIFrame* aReferenceFrame, + const nsRect& aDirtyRect) { + PresShellState* state = mPresShellStates.AppendElement(); + if (!state) + return; + state->mPresShell = aReferenceFrame->PresContext()->PresShell(); + state->mCaretFrame = nullptr; + state->mFirstFrameMarkedForDisplay = mFramesMarkedForDisplay.Length(); + + state->mPresShell->UpdateCanvasBackground(); + + if (mIsPaintingToWindow) { + mReferenceFrame->AddPaintedPresShell(state->mPresShell); + + state->mPresShell->IncrementPaintCount(); + } + + bool buildCaret = mBuildCaret; + if (mIgnoreSuppression || !state->mPresShell->IsPaintingSuppressed()) { + if (state->mPresShell->IsPaintingSuppressed()) { + mHadToIgnoreSuppression = true; + } + state->mIsBackgroundOnly = false; + } else { + state->mIsBackgroundOnly = true; + buildCaret = false; + } + + if (!buildCaret) + return; + + nsRefPtr caret = state->mPresShell->GetCaret(); + state->mCaretFrame = caret->GetCaretFrame(); + NS_ASSERTION(state->mCaretFrame == caret->GetCaretFrame(), + "GetCaretFrame() is unstable"); + + if (state->mCaretFrame) { + // Check if the dirty rect intersects with the caret's dirty rect. + nsRect caretRect = + caret->GetCaretRect() + state->mCaretFrame->GetOffsetTo(aReferenceFrame); + if (caretRect.Intersects(aDirtyRect)) { + // Okay, our rects intersect, let's mark the frame and all of its ancestors. + mFramesMarkedForDisplay.AppendElement(state->mCaretFrame); + MarkFrameForDisplay(state->mCaretFrame, nullptr); + } + } +} + +void +nsDisplayListBuilder::LeavePresShell(nsIFrame* aReferenceFrame, + const nsRect& aDirtyRect) { + if (CurrentPresShellState()->mPresShell != aReferenceFrame->PresContext()->PresShell()) { + // Must have not allocated a state for this presshell, presumably due + // to OOM. + return; + } + + ResetMarkedFramesForDisplayList(); + mPresShellStates.SetLength(mPresShellStates.Length() - 1); +} + +void +nsDisplayListBuilder::ResetMarkedFramesForDisplayList() +{ + // Unmark and pop off the frames marked for display in this pres shell. + uint32_t firstFrameForShell = CurrentPresShellState()->mFirstFrameMarkedForDisplay; + for (uint32_t i = firstFrameForShell; + i < mFramesMarkedForDisplay.Length(); ++i) { + UnmarkFrameForDisplay(mFramesMarkedForDisplay[i]); + } + mFramesMarkedForDisplay.SetLength(firstFrameForShell); +} + +void +nsDisplayListBuilder::MarkFramesForDisplayList(nsIFrame* aDirtyFrame, + const nsFrameList& aFrames, + const nsRect& aDirtyRect) { + mFramesMarkedForDisplay.SetCapacity(mFramesMarkedForDisplay.Length() + aFrames.GetLength()); + for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) { + mFramesMarkedForDisplay.AppendElement(e.get()); + MarkOutOfFlowFrameForDisplay(aDirtyFrame, e.get(), aDirtyRect); + } +} + +void +nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(nsIFrame* aDirtyFrame, const nsRect& aDirtyRect) +{ + nsAutoTArray childListArray; + aDirtyFrame->GetChildLists(&childListArray); + nsIFrame::ChildListArrayIterator lists(childListArray); + for (; !lists.IsDone(); lists.Next()) { + nsFrameList::Enumerator childFrames(lists.CurrentList()); + for (; !childFrames.AtEnd(); childFrames.Next()) { + nsIFrame *child = childFrames.get(); + if (child->Preserves3D()) { + mFramesMarkedForDisplay.AppendElement(child); + nsRect dirty = aDirtyRect - child->GetOffsetTo(aDirtyFrame); + + child->Properties().Set(nsDisplayListBuilder::Preserve3DDirtyRectProperty(), + new nsRect(dirty)); + + MarkFrameForDisplay(child, aDirtyFrame); + } + } + } +} + +void* +nsDisplayListBuilder::Allocate(size_t aSize) { + void *tmp; + PL_ARENA_ALLOCATE(tmp, &mPool, aSize); + if (!tmp) { + NS_RUNTIMEABORT("out of memory"); + } + return tmp; +} + +const DisplayItemClip* +nsDisplayListBuilder::AllocateDisplayItemClip(const DisplayItemClip& aOriginal) +{ + void* p = Allocate(sizeof(DisplayItemClip)); + if (!aOriginal.GetRoundedRectCount()) { + memcpy(p, &aOriginal, sizeof(DisplayItemClip)); + return static_cast(p); + } + + DisplayItemClip* c = new (p) DisplayItemClip(aOriginal); + mDisplayItemClipsToDestroy.AppendElement(c); + return c; +} + +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()); +} + +void +nsDisplayList::FlattenTo(nsTArray* aElements) { + nsDisplayItem* item; + while ((item = RemoveBottom()) != nullptr) { + if (item->GetType() == nsDisplayItem::TYPE_WRAP_LIST) { + item->GetSameCoordinateSystemChildren()->FlattenTo(aElements); + item->~nsDisplayItem(); + } else { + 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; +} + +bool +nsDisplayList::ComputeVisibilityForRoot(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + nsIFrame* aDisplayPortFrame) { + PROFILER_LABEL("nsDisplayList", "ComputeVisibilityForRoot"); + nsRegion r; + r.And(*aVisibleRegion, GetBounds(aBuilder)); + return ComputeVisibilityForSublist(aBuilder, aVisibleRegion, + r.GetBounds(), r.GetBounds(), + aDisplayPortFrame); +} + +static nsRegion +TreatAsOpaque(nsDisplayItem* aItem, nsDisplayListBuilder* aBuilder) +{ + bool snap; + nsRegion opaque = aItem->GetOpaqueRegion(aBuilder, &snap); + if (aBuilder->IsForPluginGeometry()) { + // Treat all leaf chrome items as opaque, unless their frames are opacity:0. + // Since opacity:0 frames generate an nsDisplayOpacity, that item will + // not be treated as opaque here, so opacity:0 chrome content will be + // effectively ignored, as it should be. + // We treat leaf chrome items as opaque to ensure that they cover + // content plugins, for security reasons. + // Non-leaf chrome items don't render contents of their own so shouldn't + // be treated as opaque (and their bounds is just the union of their + // children, which might be a large area their contents don't really cover). + nsIFrame* f = aItem->Frame(); + if (f->PresContext()->IsChrome() && !aItem->GetChildren() && + f->StyleDisplay()->mOpacity != 0.0) { + opaque = aItem->GetBounds(aBuilder, &snap); + } + } + if (opaque.IsEmpty()) { + return opaque; + } + nsRegion opaqueClipped; + nsRegionRectIterator iter(opaque); + for (const nsRect* r = iter.Next(); r; r = iter.Next()) { + opaqueClipped.Or(opaqueClipped, aItem->GetClip().ApproximateIntersectInward(*r)); + } + return opaqueClipped; +} + +/* Checks if aPotentialScrollItem is a scroll layer item and aPotentialScrollbarItem + * is an overlay scrollbar item for the same scroll frame. + */ +static bool +IsScrollLayerItemAndOverlayScrollbarForScrollFrame( + nsDisplayItem* aPotentialScrollItem, nsDisplayItem* aPotentialScrollbarItem) +{ + if (aPotentialScrollItem->GetType() == nsDisplayItem::TYPE_SCROLL_LAYER && + aPotentialScrollbarItem && + aPotentialScrollbarItem->GetType() == nsDisplayItem::TYPE_OWN_LAYER && + LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) { + nsDisplayScrollLayer* scrollItem = + static_cast(aPotentialScrollItem); + nsDisplayOwnLayer* layerItem = + static_cast(aPotentialScrollbarItem); + if ((layerItem->GetFlags() & + (nsDisplayOwnLayer::VERTICAL_SCROLLBAR | + nsDisplayOwnLayer::HORIZONTAL_SCROLLBAR)) && + layerItem->Frame()->GetParent() == scrollItem->GetScrollFrame()) { + return true; + } + } + return false; +} + +bool +nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aListVisibleBounds, + const nsRect& aAllowVisibleRegionExpansion, + nsIFrame* aDisplayPortFrame) { +#ifdef DEBUG + nsRegion r; + r.And(*aVisibleRegion, GetBounds(aBuilder)); + NS_ASSERTION(r.GetBounds().IsEqualInterior(aListVisibleBounds), + "bad aListVisibleBounds"); +#endif + + mVisibleRect = aListVisibleBounds; + bool anyVisible = false; + + nsAutoTArray elements; + FlattenTo(&elements); + + bool forceTransparentSurface = false; + + for (int32_t i = elements.Length() - 1; i >= 0; --i) { + nsDisplayItem* item = elements[i]; + nsDisplayItem* belowItem = i < 1 ? nullptr : elements[i - 1]; + + nsDisplayList* list = item->GetSameCoordinateSystemChildren(); + if (aBuilder->AllowMergingAndFlattening()) { + if (belowItem && item->TryMerge(aBuilder, belowItem)) { + belowItem->~nsDisplayItem(); + elements.ReplaceElementsAt(i - 1, 1, item); + continue; + } + + // If an overlay scrollbar item is between a scroll layer item and the + // other scroll layer items that we need to merge with just move the + // scrollbar item up, that way it will be on top of the scrolled content + // and we can try to merge all the scroll layer items. + if (IsScrollLayerItemAndOverlayScrollbarForScrollFrame(item, belowItem)) { + elements[i] = belowItem; + elements[i-1] = item; + i++; + continue; + } + + if (list && item->ShouldFlattenAway(aBuilder)) { + // The elements on the list >= i no longer serve any use. + elements.SetLength(i); + list->FlattenTo(&elements); + i = elements.Length(); + item->~nsDisplayItem(); + continue; + } + } + + nsRect bounds = item->GetClippedBounds(aBuilder); + + nsRegion itemVisible; + itemVisible.And(*aVisibleRegion, bounds); + item->mVisibleRect = itemVisible.GetBounds(); + + if (item->ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion.Intersect(bounds))) { + anyVisible = true; + + // If we're in a displayport, we need to make sure that fixed position + // items do not subtract from the visible region, as async scrolling + // may expose these occluded areas. + // If the item is fixed pos in the same document as the displayport + // then don't let it occlude this list. The only other case possible + // is that the fixed pos content is in a child document, in which it + // would scroll with the rest of the content. + bool occlude = true; + if (aDisplayPortFrame && item->IsInFixedPos()) { + if (item->Frame()->PresContext() == aDisplayPortFrame->PresContext()) { + occlude = false; + } + } + + if (occlude) { + nsRegion opaque = TreatAsOpaque(item, aBuilder); + // Subtract opaque item from the visible region + aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque); + } + + if (aBuilder->NeedToForceTransparentSurfaceForItem(item) || + (list && list->NeedsTransparentSurface())) { + forceTransparentSurface = true; + } + } + AppendToBottom(item); + } + + mIsOpaque = !aVisibleRegion->Intersects(mVisibleRect); + mForceTransparentSurface = forceTransparentSurface; +#if defined(DEBUG) || defined(MOZ_DUMP_PAINTING) + mDidComputeVisibility = true; +#endif + return anyVisible; +} + +void nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx, + uint32_t aFlags) const { + PROFILER_LABEL("nsDisplayList", "PaintRoot"); + PaintForFrame(aBuilder, aCtx, aBuilder->RootReferenceFrame(), aFlags); +} + +/** + * We paint by executing a layer manager transaction, constructing a + * single layer representing the display list, and then making it the + * root of the layer manager, drawing into the ThebesLayers. + */ +void nsDisplayList::PaintForFrame(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx, + nsIFrame* aForFrame, + uint32_t aFlags) const { + NS_ASSERTION(mDidComputeVisibility, + "Must call ComputeVisibility before calling Paint"); + + nsRefPtr layerManager; + bool widgetTransaction = false; + bool allowRetaining = false; + bool doBeginTransaction = true; + nsView *view = nullptr; + if (aFlags & PAINT_USE_WIDGET_LAYERS) { + nsIFrame* rootReferenceFrame = aBuilder->RootReferenceFrame(); + view = rootReferenceFrame->GetView(); + NS_ASSERTION(rootReferenceFrame == nsLayoutUtils::GetDisplayRootFrame(rootReferenceFrame), + "Reference frame must be a display root for us to use the layer manager"); + nsIWidget* window = rootReferenceFrame->GetNearestWidget(); + if (window) { + layerManager = window->GetLayerManager(&allowRetaining); + if (layerManager) { + doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION); + widgetTransaction = true; + } + } + } + if (!layerManager) { + if (!aCtx) { + NS_WARNING("Nowhere to paint into"); + return; + } + layerManager = new BasicLayerManager(); + } + + // Store the existing layer builder to reinstate it on return. + FrameLayerBuilder *oldBuilder = layerManager->GetLayerBuilder(); + + FrameLayerBuilder *layerBuilder = new FrameLayerBuilder(); + layerBuilder->Init(aBuilder, layerManager); + + if (aFlags & PAINT_COMPRESSED) { + layerBuilder->SetLayerTreeCompressionMode(); + } + + if (aFlags & PAINT_FLUSH_LAYERS) { + FrameLayerBuilder::InvalidateAllLayers(layerManager); + } + + if (doBeginTransaction) { + if (aCtx) { + layerManager->BeginTransactionWithTarget(aCtx->ThebesContext()); + } else { + layerManager->BeginTransaction(); + } + } + if (widgetTransaction) { + layerBuilder->DidBeginRetainedLayerTransaction(layerManager); + } + + nsPresContext* presContext = aForFrame->PresContext(); + nsIPresShell* presShell = presContext->GetPresShell(); + + NotifySubDocInvalidationFunc computeInvalidFunc = + presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0; + bool computeInvalidRect = (computeInvalidFunc || + (!layerManager->IsCompositingCheap() && layerManager->NeedsWidgetInvalidation())) && + widgetTransaction; + + nsAutoPtr props(computeInvalidRect ? + LayerProperties::CloneFrom(layerManager->GetRoot()) : + nullptr); + + ContainerLayerParameters containerParameters + (presShell->GetXResolution(), presShell->GetYResolution()); + nsRefPtr root = layerBuilder-> + BuildContainerLayerFor(aBuilder, layerManager, aForFrame, nullptr, *this, + containerParameters, nullptr); + + nsIDocument* document = nullptr; + if (presShell) { + document = presShell->GetDocument(); + } + + if (widgetTransaction || + // SVG-as-an-image docs don't paint as part of the retained layer tree, + // but they still need the invalidation state bits cleared in order for + // invalidation for CSS/SMIL animation to work properly. + (document && document->IsBeingUsedAsImage())) { + aForFrame->ClearInvalidationStateBits(); + } + + if (!root) { + layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder); + return; + } + // Root is being scaled up by the X/Y resolution. Scale it back down. + root->SetPostScale(1.0f/containerParameters.mXScale, + 1.0f/containerParameters.mYScale); + + ViewID id = FrameMetrics::NULL_SCROLL_ID; + bool isRoot = presContext->IsRootContentDocument(); + + nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame(); + nsRect displayport, criticalDisplayport; + bool usingDisplayport = false; + bool usingCriticalDisplayport = false; + if (rootScrollFrame) { + nsIContent* content = rootScrollFrame->GetContent(); + if (content) { + usingDisplayport = nsLayoutUtils::GetDisplayPort(content, &displayport); + usingCriticalDisplayport = + nsLayoutUtils::GetCriticalDisplayPort(content, &criticalDisplayport); + + // If this is the root content document, we want it to have a scroll id. + if (isRoot) { + id = nsLayoutUtils::FindOrCreateIDFor(content); + } + } + } + + nsRect viewport(aBuilder->ToReferenceFrame(aForFrame), aForFrame->GetSize()); + + RecordFrameMetrics(aForFrame, rootScrollFrame, + aBuilder->FindReferenceFrameFor(aForFrame), + root, mVisibleRect, viewport, + (usingDisplayport ? &displayport : nullptr), + (usingCriticalDisplayport ? &criticalDisplayport : nullptr), + id, isRoot, containerParameters); + if (usingDisplayport && + !(root->GetContentFlags() & Layer::CONTENT_OPAQUE)) { + // See bug 693938, attachment 567017 + NS_WARNING("Transparent content with displayports can be expensive."); + } + + layerManager->SetRoot(root); + layerBuilder->WillEndTransaction(); + 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; + } + } + + layerManager->EndTransaction(FrameLayerBuilder::DrawThebesLayer, + aBuilder, flags); + aBuilder->SetIsCompositingCheap(temp); + layerBuilder->DidEndTransaction(); + + nsIntRegion invalid; + if (props) { + invalid = props->ComputeDifferences(root, computeInvalidFunc); + } else if (widgetTransaction) { + LayerProperties::ClearInvalidations(root); + } + + bool shouldInvalidate = layerManager->NeedsWidgetInvalidation(); + if (view) { + if (props) { + if (!invalid.IsEmpty()) { + nsIntRect bounds = invalid.GetBounds(); + nsRect rect(presContext->DevPixelsToAppUnits(bounds.x), + presContext->DevPixelsToAppUnits(bounds.y), + presContext->DevPixelsToAppUnits(bounds.width), + presContext->DevPixelsToAppUnits(bounds.height)); + if (shouldInvalidate) { + view->GetViewManager()->InvalidateViewNoSuppression(view, rect); + } + presContext->NotifyInvalidation(bounds, 0); + } + } else if (shouldInvalidate) { + view->GetViewManager()->InvalidateView(view); + } + } + + if (aFlags & PAINT_FLUSH_LAYERS) { + FrameLayerBuilder::InvalidateAllLayers(layerManager); + } + + layerManager->SetUserData(&gLayerManagerLayerBuilder, oldBuilder); +} + +uint32_t nsDisplayList::Count() const { + uint32_t count = 0; + for (nsDisplayItem* i = GetBottom(); i; i = i->GetAbove()) { + ++count; + } + return count; +} + +nsDisplayItem* nsDisplayList::RemoveBottom() { + nsDisplayItem* item = mSentinel.mAbove; + if (!item) + return nullptr; + mSentinel.mAbove = item->mAbove; + if (item == mTop) { + // must have been the only item + mTop = &mSentinel; + } + item->mAbove = nullptr; + return item; +} + +void nsDisplayList::DeleteAll() { + nsDisplayItem* item; + while ((item = RemoveBottom()) != nullptr) { + item->~nsDisplayItem(); + } +} + +static bool +GetMouseThrough(const nsIFrame* aFrame) +{ + if (!aFrame->IsBoxFrame()) + return false; + + const nsIFrame* frame = aFrame; + while (frame) { + if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_ALWAYS) { + return true; + } else if (frame->GetStateBits() & NS_FRAME_MOUSE_THROUGH_NEVER) { + return false; + } + frame = frame->GetParentBox(); + } + return false; +} + +static bool +IsFrameReceivingPointerEvents(nsIFrame* aFrame) +{ + nsSubDocumentFrame* frame = do_QueryFrame(aFrame); + if (frame && frame->PassPointerEventsToChildren()) { + return true; + } + return NS_STYLE_POINTER_EVENTS_NONE != + aFrame->StyleVisibility()->GetEffectivePointerEvents(aFrame); +} + +// A list of frames, and their z depth. Used for sorting +// the results of hit testing. +struct FramesWithDepth +{ + FramesWithDepth(float aDepth) : + mDepth(aDepth) + {} + + bool operator<(const FramesWithDepth& aOther) const { + if (mDepth != aOther.mDepth) { + // We want to sort so that the shallowest item (highest depth value) is first + return mDepth > aOther.mDepth; + } + return this < &aOther; + } + bool operator==(const FramesWithDepth& aOther) const { + return this == &aOther; + } + + float mDepth; + nsTArray mFrames; +}; + +// Sort the frames by depth and then moves all the contained frames to the destination +void FlushFramesArray(nsTArray& aSource, nsTArray* aDest) +{ + if (aSource.IsEmpty()) { + return; + } + aSource.Sort(); + uint32_t length = aSource.Length(); + for (uint32_t i = 0; i < length; i++) { + aDest->MoveElementsFrom(aSource[i].mFrames); + } + aSource.Clear(); +} + +void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect, + nsDisplayItem::HitTestState* aState, + nsTArray *aOutFrames) const { + int32_t itemBufferStart = aState->mItemBuffer.Length(); + nsDisplayItem* item; + for (item = GetBottom(); item; item = item->GetAbove()) { + aState->mItemBuffer.AppendElement(item); + } + nsAutoTArray temp; + for (int32_t i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart; --i) { + // Pop element off the end of the buffer. We want to shorten the buffer + // so that recursive calls to HitTest have more buffer space. + item = aState->mItemBuffer[i]; + aState->mItemBuffer.SetLength(i); + + bool snap; + nsRect r = item->GetBounds(aBuilder, &snap).Intersect(aRect); + if (item->GetClip().MayIntersect(r)) { + nsAutoTArray 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 *writeFrames = aOutFrames; + if (item->GetType() == nsDisplayItem::TYPE_TRANSFORM && + item->Frame()->Preserves3D()) { + if (outFrames.Length()) { + nsDisplayTransform *transform = static_cast(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(aClosure); + // It's possible that the nsIContent for aItem1 or aItem2 is in a subdocument + // of commonAncestor, because display items for subdocuments have been + // mixed into the same list. Ensure that we're looking at content + // in commonAncestor's document. + nsIDocument* commonAncestorDoc = commonAncestor->OwnerDoc(); + nsIContent* content1 = FindContentInDocument(aItem1, commonAncestorDoc); + nsIContent* content2 = FindContentInDocument(aItem2, commonAncestorDoc); + if (!content1 || !content2) { + NS_ERROR("Document trees are mixed up!"); + // Something weird going on + return true; + } + return nsLayoutUtils::CompareTreePosition(content1, content2, commonAncestor) <= 0; +} + +static bool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2, + void* aClosure) { + // Note that we can't just take the difference of the two + // z-indices here, because that might overflow a 32-bit int. + return aItem1->ZIndex() <= aItem2->ZIndex(); +} + +void nsDisplayList::SortByZOrder(nsDisplayListBuilder* aBuilder, + nsIContent* aCommonAncestor) { + Sort(aBuilder, IsZOrderLEQ, aCommonAncestor); +} + +void nsDisplayList::SortByContentOrder(nsDisplayListBuilder* aBuilder, + nsIContent* aCommonAncestor) { + Sort(aBuilder, IsContentLEQ, aCommonAncestor); +} + +void nsDisplayList::Sort(nsDisplayListBuilder* aBuilder, + SortLEQ aCmp, void* aClosure) { + ::Sort(this, Count(), aCmp, aClosure); +} + +void +nsDisplayItem::AddInvalidRegionForSyncDecodeBackgroundImages( + nsDisplayListBuilder* aBuilder, + const nsDisplayItemGeometry* aGeometry, + nsRegion* aInvalidRegion) +{ + if (aBuilder->ShouldSyncDecodeImages()) { + if (!nsCSSRendering::AreAllBackgroundImagesDecodedForFrame(mFrame)) { + bool snap; + aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap)); + } + } +} + +/* static */ bool +nsDisplayItem::ForceActiveLayers() +{ + static bool sForce = false; + static bool sForceCached = false; + + if (!sForceCached) { + Preferences::AddBoolVarCache(&sForce, "layers.force-active", false); + sForceCached = true; + } + + return sForce; +} + +/* static */ int32_t +nsDisplayItem::MaxActiveLayers() +{ + static int32_t sMaxLayers = false; + static bool sMaxLayersCached = false; + + if (!sMaxLayersCached) { + Preferences::AddIntVarCache(&sMaxLayers, "layers.max-active", -1); + sMaxLayersCached = true; + } + + return sMaxLayers; +} + +int32_t +nsDisplayItem::ZIndex() const +{ + if (!mFrame->IsPositioned() && !mFrame->IsFlexItem()) + return 0; + + const nsStylePosition* position = mFrame->StylePosition(); + if (position->mZIndex.GetUnit() == eStyleUnit_Integer) + return position->mZIndex.GetIntValue(); + + // sort the auto and 0 elements together + return 0; +} + +bool +nsDisplayItem::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, nsRect())) + return false; + + nsRegion opaque = TreatAsOpaque(this, aBuilder); + aBuilder->SubtractFromVisibleRegion(aVisibleRegion, opaque); + return true; +} + +nsRect +nsDisplayItem::GetClippedBounds(nsDisplayListBuilder* aBuilder) +{ + bool snap; + nsRect r = GetBounds(aBuilder, &snap); + return GetClip().ApplyNonRoundedIntersection(r); +} + +nsRect +nsDisplaySolidColor::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + *aSnap = true; + return mBounds; +} + +void +nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) +{ + aCtx->SetColor(mColor); + aCtx->FillRect(mVisibleRect); +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplaySolidColor::WriteDebugInfo(nsACString& aTo) +{ + aTo += nsPrintfCString(" (rgba %d,%d,%d,%d)", + NS_GET_R(mColor), NS_GET_G(mColor), + NS_GET_B(mColor), NS_GET_A(mColor)); +} +#endif + +static void +RegisterThemeGeometry(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) +{ + nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame); + + for (nsIFrame* f = aFrame; f; f = f->GetParent()) { + // Bail out if we're in a transformed subtree + if (f->IsTransformed()) + return; + // Bail out if we're not in the displayRoot's document + if (!f->GetParent() && f != displayRoot) + return; + } + + nsRect borderBox(aFrame->GetOffsetTo(displayRoot), aFrame->GetSize()); + aBuilder->RegisterThemeGeometry(aFrame->StyleDisplay()->mAppearance, + borderBox.ToNearestPixels(aFrame->PresContext()->AppUnitsPerDevPixel())); +} + +nsDisplayBackgroundImage::nsDisplayBackgroundImage(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, + uint32_t aLayer, + const nsStyleBackground* aBackgroundStyle) + : nsDisplayImageContainer(aBuilder, aFrame) + , mBackgroundStyle(aBackgroundStyle) + , mLayer(aLayer) +{ + MOZ_COUNT_CTOR(nsDisplayBackgroundImage); + + mBounds = GetBoundsInternal(aBuilder); +} + +nsDisplayBackgroundImage::~nsDisplayBackgroundImage() +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_DTOR(nsDisplayBackgroundImage); +#endif +} + +static nsStyleContext* GetBackgroundStyleContext(nsIFrame* aFrame) +{ + nsStyleContext *sc; + if (!nsCSSRendering::FindBackground(aFrame, &sc)) { + // We don't want to bail out if moz-appearance is set on a root + // node. If it has a parent content node, bail because it's not + // a root, other wise keep going in order to let the theme stuff + // draw the background. The canvas really should be drawing the + // bg, but there's no way to hook that up via css. + if (!aFrame->StyleDisplay()->mAppearance) { + return nullptr; + } + + nsIContent* content = aFrame->GetContent(); + if (!content || content->GetParent()) { + return nullptr; + } + + sc = aFrame->StyleContext(); + } + return sc; +} + +/*static*/ bool +nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, + nsDisplayList* aList) +{ + nsStyleContext* bgSC = nullptr; + const nsStyleBackground* bg = nullptr; + nsPresContext* presContext = aFrame->PresContext(); + bool isThemed = aFrame->IsThemed(); + if (!isThemed) { + bgSC = GetBackgroundStyleContext(aFrame); + if (bgSC) { + bg = bgSC->StyleBackground(); + } + } + + bool drawBackgroundColor = false; + nscolor color; + if (!nsCSSRendering::IsCanvasFrame(aFrame) && bg) { + bool drawBackgroundImage; + color = + nsCSSRendering::DetermineBackgroundColor(presContext, bgSC, aFrame, + drawBackgroundImage, drawBackgroundColor); + } + + // 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()) { + bgItemList.AppendNewToTop( + new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bg, + drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0))); + } + + if (isThemed) { + nsDisplayThemedBackground* bgItem = + new (aBuilder) nsDisplayThemedBackground(aBuilder, aFrame); + bgItemList.AppendNewToTop(bgItem); + aList->AppendToTop(&bgItemList); + return true; + } + + if (!bg) { + aList->AppendToTop(&bgItemList); + return false; + } + + bool needBlendContainer = false; + + // Passing bg == nullptr in this macro will result in one iteration with + // i = 0. + NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) { + if (bg->mLayers[i].mImage.IsEmpty()) { + continue; + } + + if (bg->mLayers[i].mBlendMode != NS_STYLE_BLEND_NORMAL) { + needBlendContainer = true; + } + + nsDisplayBackgroundImage* bgItem = + new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bg); + bgItemList.AppendNewToTop(bgItem); + } + + if (needBlendContainer) { + bgItemList.AppendNewToTop( + new (aBuilder) nsDisplayBlendContainer(aBuilder, aFrame, &bgItemList)); + } + + aList->AppendToTop(&bgItemList); + return false; +} + +// Check that the rounded border of aFrame, added to aToReferenceFrame, +// intersects aRect. Assumes that the unrounded border has already +// been checked for intersection. +static bool +RoundedBorderIntersectsRect(nsIFrame* aFrame, + const nsPoint& aFrameToReferenceFrame, + const nsRect& aTestRect) +{ + if (!nsRect(aFrameToReferenceFrame, aFrame->GetSize()).Intersects(aTestRect)) + return false; + + nscoord radii[8]; + return !aFrame->GetBorderRadii(radii) || + nsLayoutUtils::RoundedRectIntersectsRect(nsRect(aFrameToReferenceFrame, + aFrame->GetSize()), + radii, aTestRect); +} + +// Returns TRUE if aContainedRect is guaranteed to be contained in +// the rounded rect defined by aRoundedRect and aRadii. Complex cases are +// handled conservatively by returning FALSE in some situations where +// a more thorough analysis could return TRUE. +// +// See also RoundedRectIntersectsRect. +static bool RoundedRectContainsRect(const nsRect& aRoundedRect, + const nscoord aRadii[8], + const nsRect& aContainedRect) { + nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(aRoundedRect, aRadii, aContainedRect); + return rgn.Contains(aContainedRect); +} + +bool +nsDisplayBackgroundImage::IsSingleFixedPositionImage(nsDisplayListBuilder* aBuilder, + const nsRect& aClipRect, + gfxRect* aDestRect) +{ + if (!mBackgroundStyle) + return false; + + if (mBackgroundStyle->mLayers.Length() != 1) + return false; + + nsPresContext* presContext = mFrame->PresContext(); + uint32_t flags = aBuilder->GetBackgroundPaintFlags(); + nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize()); + const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer]; + + if (layer.mAttachment != NS_STYLE_BG_ATTACHMENT_FIXED) + return false; + + nsBackgroundLayerState state = + nsCSSRendering::PrepareBackgroundLayer(presContext, + mFrame, + flags, + borderArea, + aClipRect, + *mBackgroundStyle, + layer); + + nsImageRenderer* imageRenderer = &state.mImageRenderer; + // We only care about images here, not gradients. + if (!imageRenderer->IsRasterImage()) + return false; + + int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); + *aDestRect = nsLayoutUtils::RectToGfxRect(state.mFillArea, appUnitsPerDevPixel); + + return true; +} + +bool +nsDisplayBackgroundImage::TryOptimizeToImageLayer(LayerManager* aManager, + nsDisplayListBuilder* aBuilder) +{ + if (!mBackgroundStyle) + return false; + + nsPresContext* presContext = mFrame->PresContext(); + uint32_t flags = aBuilder->GetBackgroundPaintFlags(); + nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize()); + const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer]; + + if (layer.mClip != NS_STYLE_BG_CLIP_BORDER) { + return false; + } + nscoord radii[8]; + if (mFrame->GetBorderRadii(radii)) { + return false; + } + + nsBackgroundLayerState state = + nsCSSRendering::PrepareBackgroundLayer(presContext, + mFrame, + flags, + borderArea, + borderArea, + *mBackgroundStyle, + layer); + + nsImageRenderer* imageRenderer = &state.mImageRenderer; + // We only care about images here, not gradients. + if (!imageRenderer->IsRasterImage()) + return false; + + nsRefPtr imageContainer = imageRenderer->GetContainer(aManager); + // Image is not ready to be made into a layer yet + if (!imageContainer) + return false; + + // We currently can't handle tiled or partial backgrounds. + if (!state.mDestArea.IsEqualEdges(state.mFillArea)) { + return false; + } + + // XXX Ignoring state.mAnchor. ImageLayer drawing snaps mDestArea edges to + // layer pixel boundaries. This should be OK for now. + + int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel(); + mDestRect = nsLayoutUtils::RectToGfxRect(state.mDestArea, appUnitsPerDevPixel); + mImageContainer = imageContainer; + + // Ok, we can turn this into a layer if needed. + return true; +} + +already_AddRefed +nsDisplayBackgroundImage::GetContainer(LayerManager* aManager, + nsDisplayListBuilder *aBuilder) +{ + if (!TryOptimizeToImageLayer(aManager, aBuilder)) { + return nullptr; + } + + nsRefPtr container = mImageContainer; + + return container.forget(); +} + +LayerState +nsDisplayBackgroundImage::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) +{ + bool animated = false; + if (mBackgroundStyle) { + const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer]; + const nsStyleImage* image = &layer.mImage; + if (image->GetType() == eStyleImageType_Image) { + imgIRequest* imgreq = image->GetImageData(); + nsCOMPtr image; + if (NS_SUCCEEDED(imgreq->GetImage(getter_AddRefs(image))) && image) { + if (NS_FAILED(image->GetAnimated(&animated))) { + animated = false; + } + } + } + } + + if (!animated || + !nsLayoutUtils::AnimatedImageLayersEnabled()) { + if (!aManager->IsCompositingCheap() || + !nsLayoutUtils::GPUImageScalingEnabled()) { + return LAYER_NONE; + } + } + + if (!TryOptimizeToImageLayer(aManager, aBuilder)) { + return LAYER_NONE; + } + + if (!animated) { + mozilla::gfx::IntSize imageSize = mImageContainer->GetCurrentSize(); + NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!"); + + gfxRect destRect = mDestRect; + + destRect.width *= aParameters.mXScale; + destRect.height *= aParameters.mYScale; + + // Calculate the scaling factor for the frame. + gfxSize scale = gfxSize(destRect.width / imageSize.width, destRect.height / imageSize.height); + + // If we are not scaling at all, no point in separating this into a layer. + if (scale.width == 1.0f && scale.height == 1.0f) { + return LAYER_NONE; + } + + // If the target size is pretty small, no point in using a layer. + if (destRect.width * destRect.height < 64 * 64) { + return LAYER_NONE; + } + } + + return LAYER_ACTIVE; +} + +already_AddRefed +nsDisplayBackgroundImage::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) +{ + nsRefPtr layer = static_cast + (aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this)); + if (!layer) { + layer = aManager->CreateImageLayer(); + if (!layer) + return nullptr; + } + layer->SetContainer(mImageContainer); + ConfigureLayer(layer, aParameters.mOffset); + return layer.forget(); +} + +void +nsDisplayBackgroundImage::ConfigureLayer(ImageLayer* aLayer, const nsIntPoint& aOffset) +{ + aLayer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(mFrame)); + + mozilla::gfx::IntSize imageSize = mImageContainer->GetCurrentSize(); + NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!"); + + gfxPoint p = mDestRect.TopLeft() + aOffset; + gfx::Matrix transform; + transform.Translate(p.x, p.y); + transform.Scale(mDestRect.width/imageSize.width, + mDestRect.height/imageSize.height); + aLayer->SetBaseTransform(gfx::Matrix4x4::From2D(transform)); + aLayer->SetVisibleRegion(nsIntRect(0, 0, imageSize.width, imageSize.height)); +} + +void +nsDisplayBackgroundImage::HitTest(nsDisplayListBuilder* aBuilder, + const nsRect& aRect, + HitTestState* aState, + nsTArray *aOutFrames) +{ + if (RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) { + aOutFrames->AppendElement(mFrame); + } +} + +bool +nsDisplayBackgroundImage::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) +{ + if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion)) { + return false; + } + + // Return false if the background was propagated away from this + // frame. We don't want this display item to show up and confuse + // anything. + return mBackgroundStyle; +} + +/* static */ nsRegion +nsDisplayBackgroundImage::GetInsideClipRegion(nsDisplayItem* aItem, + nsPresContext* aPresContext, + uint8_t aClip, const nsRect& aRect, + bool* aSnap) +{ + nsRegion result; + if (aRect.IsEmpty()) + return result; + + nsIFrame *frame = aItem->Frame(); + + nscoord radii[8]; + nsRect clipRect; + bool haveRadii; + switch (aClip) { + case NS_STYLE_BG_CLIP_BORDER: + haveRadii = frame->GetBorderRadii(radii); + clipRect = nsRect(aItem->ToReferenceFrame(), frame->GetSize()); + break; + case NS_STYLE_BG_CLIP_PADDING: + haveRadii = frame->GetPaddingBoxBorderRadii(radii); + clipRect = frame->GetPaddingRect() - frame->GetPosition() + aItem->ToReferenceFrame(); + break; + case NS_STYLE_BG_CLIP_CONTENT: + haveRadii = frame->GetContentBoxBorderRadii(radii); + clipRect = frame->GetContentRect() - frame->GetPosition() + aItem->ToReferenceFrame(); + break; + default: + NS_NOTREACHED("Unknown clip type"); + return result; + } + + if (haveRadii) { + *aSnap = false; + result = nsLayoutUtils::RoundedRectIntersectRect(clipRect, radii, aRect); + } else { + result = clipRect.Intersect(aRect); + } + return result; +} + +nsRegion +nsDisplayBackgroundImage::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, + bool* aSnap) { + nsRegion result; + *aSnap = false; + + if (!mBackgroundStyle) + return result; + + + *aSnap = true; + + // For policies other than EACH_BOX, 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 (mBackgroundStyle->mBackgroundInlinePolicy == NS_STYLE_BG_INLINE_POLICY_EACH_BOX || + (!mFrame->GetPrevContinuation() && !mFrame->GetNextContinuation())) { + const nsStyleBackground::Layer& layer = mBackgroundStyle->mLayers[mLayer]; + if (layer.mImage.IsOpaque() && layer.mBlendMode == NS_STYLE_BLEND_NORMAL) { + nsPresContext* presContext = mFrame->PresContext(); + result = GetInsideClipRegion(this, presContext, layer.mClip, mBounds, aSnap); + } + } + + return result; +} + +bool +nsDisplayBackgroundImage::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) { + if (!mBackgroundStyle) { + *aColor = NS_RGBA(0,0,0,0); + return true; + } + return false; +} + +bool +nsDisplayBackgroundImage::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame) +{ + if (!mBackgroundStyle) + return false; + if (!mBackgroundStyle->HasFixedBackground()) + return false; + + // If aFrame is mFrame or an ancestor in this document, and aFrame is + // not the viewport frame, then moving aFrame will move mFrame + // relative to the viewport, so our fixed-pos background will change. + return aFrame->GetParent() && + (aFrame == mFrame || + nsLayoutUtils::IsProperAncestorFrame(aFrame, mFrame)); +} + +nsRect +nsDisplayBackgroundImage::GetPositioningArea() +{ + if (!mBackgroundStyle) { + return nsRect(); + } + nsIFrame* attachedToFrame; + return nsCSSRendering::ComputeBackgroundPositioningArea( + mFrame->PresContext(), mFrame, + nsRect(ToReferenceFrame(), mFrame->GetSize()), + *mBackgroundStyle, mBackgroundStyle->mLayers[mLayer], + &attachedToFrame) + ToReferenceFrame(); +} + +bool +nsDisplayBackgroundImage::RenderingMightDependOnPositioningAreaSizeChange() +{ + if (!mBackgroundStyle) + return false; + + nscoord radii[8]; + if (mFrame->GetBorderRadii(radii)) { + // A change in the size of the positioning area might change the position + // of the rounded corners. + return true; + } + + const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer]; + if (layer.RenderingMightDependOnPositioningAreaSizeChange()) { + return true; + } + return false; +} + +static void CheckForBorderItem(nsDisplayItem *aItem, uint32_t& aFlags) +{ + nsDisplayItem* nextItem = aItem->GetAbove(); + while (nextItem && nextItem->GetType() == nsDisplayItem::TYPE_BACKGROUND) { + nextItem = nextItem->GetAbove(); + } + if (nextItem && + nextItem->Frame() == aItem->Frame() && + nextItem->GetType() == nsDisplayItem::TYPE_BORDER) { + aFlags |= nsCSSRendering::PAINTBG_WILL_PAINT_BORDER; + } +} + +void +nsDisplayBackgroundImage::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) { + PaintInternal(aBuilder, aCtx, mVisibleRect, nullptr); +} + +void +nsDisplayBackgroundImage::PaintInternal(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx, const nsRect& aBounds, + nsRect* aClipRect) { + nsPoint offset = ToReferenceFrame(); + uint32_t flags = aBuilder->GetBackgroundPaintFlags(); + CheckForBorderItem(this, flags); + + nsCSSRendering::PaintBackground(mFrame->PresContext(), *aCtx, mFrame, + aBounds, + nsRect(offset, mFrame->GetSize()), + flags, aClipRect, mLayer); + +} + +void nsDisplayBackgroundImage::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder, + const nsDisplayItemGeometry* aGeometry, + nsRegion* aInvalidRegion) +{ + if (!mBackgroundStyle) { + return; + } + + const nsDisplayBackgroundGeometry* geometry = static_cast(aGeometry); + + bool snap; + nsRect bounds = GetBounds(aBuilder, &snap); + nsRect positioningArea = GetPositioningArea(); + if (positioningArea.TopLeft() != geometry->mPositioningArea.TopLeft() || + (positioningArea.Size() != geometry->mPositioningArea.Size() && + RenderingMightDependOnPositioningAreaSizeChange())) { + // Positioning area changed in a way that could cause everything to change, + // so invalidate everything (both old and new painting areas). + aInvalidRegion->Or(bounds, geometry->mBounds); + + if (positioningArea.Size() != geometry->mPositioningArea.Size()) { + NotifyRenderingChanged(); + } + return; + } + if (aBuilder->ShouldSyncDecodeImages()) { + if (mBackgroundStyle && + !nsCSSRendering::IsBackgroundImageDecodedForStyleContextAndLayer(mBackgroundStyle, mLayer)) { + aInvalidRegion->Or(*aInvalidRegion, bounds); + + NotifyRenderingChanged(); + } + } + if (!bounds.IsEqualInterior(geometry->mBounds)) { + // Positioning area is unchanged, so invalidate just the change in the + // painting area. + aInvalidRegion->Xor(bounds, geometry->mBounds); + + NotifyRenderingChanged(); + } +} + +nsRect +nsDisplayBackgroundImage::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) { + *aSnap = true; + return mBounds; +} + +nsRect +nsDisplayBackgroundImage::GetBoundsInternal(nsDisplayListBuilder* aBuilder) { + nsPresContext* presContext = mFrame->PresContext(); + + if (!mBackgroundStyle) { + return nsRect(); + } + + nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize()); + nsRect clipRect = borderBox; + if (mFrame->GetType() == nsGkAtoms::canvasFrame) { + nsCanvasFrame* frame = static_cast(mFrame); + clipRect = frame->CanvasArea() + ToReferenceFrame(); + } + const nsStyleBackground::Layer& layer = mBackgroundStyle->mLayers[mLayer]; + return nsCSSRendering::GetBackgroundLayerRect(presContext, mFrame, + borderBox, clipRect, + *mBackgroundStyle, layer, + aBuilder->GetBackgroundPaintFlags()); +} + +uint32_t +nsDisplayBackgroundImage::GetPerFrameKey() +{ + return (mLayer << nsDisplayItem::TYPE_BITS) | + nsDisplayItem::GetPerFrameKey(); +} + +nsDisplayThemedBackground::nsDisplayThemedBackground(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame) + : nsDisplayItem(aBuilder, aFrame) +{ + MOZ_COUNT_CTOR(nsDisplayThemedBackground); + + const nsStyleDisplay* disp = mFrame->StyleDisplay(); + mAppearance = disp->mAppearance; + mFrame->IsThemed(disp, &mThemeTransparency); + + // Perform necessary RegisterThemeGeometry + switch (disp->mAppearance) { + case NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR: + case NS_THEME_TOOLBAR: + case NS_THEME_WINDOW_TITLEBAR: + case NS_THEME_WINDOW_BUTTON_BOX: + case NS_THEME_MOZ_MAC_FULLSCREEN_BUTTON: + case NS_THEME_WINDOW_BUTTON_BOX_MAXIMIZED: + RegisterThemeGeometry(aBuilder, aFrame); + break; + case NS_THEME_WIN_BORDERLESS_GLASS: + case NS_THEME_WIN_GLASS: + aBuilder->SetGlassDisplayItem(this); + break; + } + + mBounds = GetBoundsInternal(); +} + +nsDisplayThemedBackground::~nsDisplayThemedBackground() +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_DTOR(nsDisplayThemedBackground); +#endif +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplayThemedBackground::WriteDebugInfo(nsACString& aTo) +{ + aTo += nsPrintfCString(" (themed, appearance:%d)", mAppearance); +} +#endif + +void +nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder, + const nsRect& aRect, + HitTestState* aState, + nsTArray *aOutFrames) +{ + // Assume that any point in our border rect is a hit. + if (nsRect(ToReferenceFrame(), mFrame->GetSize()).Intersects(aRect)) { + aOutFrames->AppendElement(mFrame); + } +} + +nsRegion +nsDisplayThemedBackground::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, + bool* aSnap) { + nsRegion result; + *aSnap = false; + + if (mThemeTransparency == nsITheme::eOpaque) { + result = nsRect(ToReferenceFrame(), mFrame->GetSize()); + } + return result; +} + +bool +nsDisplayThemedBackground::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) { + if (mAppearance == NS_THEME_WIN_BORDERLESS_GLASS || + mAppearance == NS_THEME_WIN_GLASS) { + *aColor = NS_RGBA(0,0,0,0); + return true; + } + return false; +} + +nsRect +nsDisplayThemedBackground::GetPositioningArea() +{ + return nsRect(ToReferenceFrame(), mFrame->GetSize()); +} + +void +nsDisplayThemedBackground::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) +{ + PaintInternal(aBuilder, aCtx, mVisibleRect, nullptr); +} + + +void +nsDisplayThemedBackground::PaintInternal(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx, const nsRect& aBounds, + nsRect* aClipRect) +{ + // XXXzw this ignores aClipRect. + nsPresContext* presContext = mFrame->PresContext(); + nsITheme *theme = presContext->GetTheme(); + nsRect borderArea(ToReferenceFrame(), mFrame->GetSize()); + nsRect drawing(borderArea); + theme->GetWidgetOverflow(presContext->DeviceContext(), mFrame, mAppearance, + &drawing); + drawing.IntersectRect(drawing, aBounds); + theme->DrawWidgetBackground(aCtx, mFrame, mAppearance, borderArea, drawing); +} + +bool nsDisplayThemedBackground::IsWindowActive() +{ + EventStates docState = mFrame->GetContent()->OwnerDoc()->GetDocumentState(); + return !docState.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE); +} + +void nsDisplayThemedBackground::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder, + const nsDisplayItemGeometry* aGeometry, + nsRegion* aInvalidRegion) +{ + const nsDisplayThemedBackgroundGeometry* geometry = static_cast(aGeometry); + + bool snap; + nsRect bounds = GetBounds(aBuilder, &snap); + nsRect positioningArea = GetPositioningArea(); + if (!positioningArea.IsEqualInterior(geometry->mPositioningArea)) { + // Invalidate everything (both old and new painting areas). + aInvalidRegion->Or(bounds, geometry->mBounds); + return; + } + if (!bounds.IsEqualInterior(geometry->mBounds)) { + // Positioning area is unchanged, so invalidate just the change in the + // painting area. + aInvalidRegion->Xor(bounds, geometry->mBounds); + } + nsITheme* theme = mFrame->PresContext()->GetTheme(); + if (theme->WidgetAppearanceDependsOnWindowFocus(mAppearance) && + IsWindowActive() != geometry->mWindowIsActive) { + aInvalidRegion->Or(*aInvalidRegion, bounds); + } +} + +nsRect +nsDisplayThemedBackground::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) { + *aSnap = true; + return mBounds; +} + +nsRect +nsDisplayThemedBackground::GetBoundsInternal() { + nsPresContext* presContext = mFrame->PresContext(); + + nsRect r(nsPoint(0,0), mFrame->GetSize()); + presContext->GetTheme()-> + GetWidgetOverflow(presContext->DeviceContext(), mFrame, + mFrame->StyleDisplay()->mAppearance, &r); +#ifdef XP_MACOSX + // Bug 748219 + r.Inflate(mFrame->PresContext()->AppUnitsPerDevPixel()); +#endif + + return r + ToReferenceFrame(); +} + +void +nsDisplayBackgroundColor::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) +{ + if (mColor == NS_RGBA(0, 0, 0, 0)) { + return; + } + + nsPoint offset = ToReferenceFrame(); + uint32_t flags = aBuilder->GetBackgroundPaintFlags(); + CheckForBorderItem(this, flags); + nsCSSRendering::PaintBackgroundColor(mFrame->PresContext(), *aCtx, mFrame, + mVisibleRect, + nsRect(offset, mFrame->GetSize()), + flags); +} + +nsRegion +nsDisplayBackgroundColor::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, + bool* aSnap) +{ + if (NS_GET_A(mColor) != 255) { + return nsRegion(); + } + + if (!mBackgroundStyle) + return nsRegion(); + + *aSnap = true; + + const nsStyleBackground::Layer& bottomLayer = mBackgroundStyle->BottomLayer(); + nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize()); + nsPresContext* presContext = mFrame->PresContext(); + return nsDisplayBackgroundImage::GetInsideClipRegion(this, presContext, bottomLayer.mClip, borderBox, aSnap); +} + +bool +nsDisplayBackgroundColor::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) +{ + *aColor = mColor; + + if (!mBackgroundStyle) + return true; + + return (!nsLayoutUtils::HasNonZeroCorner(mFrame->StyleBorder()->mBorderRadius) && + mBackgroundStyle->BottomLayer().mClip == NS_STYLE_BG_CLIP_BORDER); +} + +void +nsDisplayBackgroundColor::HitTest(nsDisplayListBuilder* aBuilder, + const nsRect& aRect, + HitTestState* aState, + nsTArray *aOutFrames) +{ + if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) { + // aRect doesn't intersect our border-radius curve. + return; + } + + aOutFrames->AppendElement(mFrame); +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplayBackgroundColor::WriteDebugInfo(nsACString& aTo) +{ + aTo += nsPrintfCString(" (rgba %d,%d,%d,%d)", + NS_GET_R(mColor), NS_GET_G(mColor), + NS_GET_B(mColor), NS_GET_A(mColor)); +} +#endif + +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::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion)) { + return false; + } + + const nsStyleOutline* outline = mFrame->StyleOutline(); + nsRect borderBox(ToReferenceFrame(), mFrame->GetSize()); + if (borderBox.Contains(aVisibleRegion->GetBounds()) && + !nsLayoutUtils::HasNonZeroCorner(outline->mOutlineRadius)) { + if (outline->mOutlineOffset >= 0) { + // the visible region is entirely inside the border-rect, and the outline + // isn't rendered inside the border-rect, so the outline is not visible + return false; + } + } + + return true; +} + +void +nsDisplayEventReceiver::HitTest(nsDisplayListBuilder* aBuilder, + const nsRect& aRect, + HitTestState* aState, + nsTArray *aOutFrames) +{ + if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) { + // aRect doesn't intersect our border-radius curve. + return; + } + + aOutFrames->AppendElement(mFrame); +} + +void +nsDisplayLayerEventRegions::AddFrame(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame) +{ + NS_ASSERTION(aBuilder->FindReferenceFrameFor(aFrame) == aBuilder->FindReferenceFrameFor(mFrame), + "Reference frame mismatch"); + uint8_t pointerEvents = aFrame->StyleVisibility()->mPointerEvents; + if (pointerEvents == NS_STYLE_POINTER_EVENTS_NONE) { + return; + } + // XXX handle other pointerEvents values for SVG + // XXX Do something clever here for the common case where the border box + // is obviously entirely inside mHitRegion. + nsRect borderBox(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize()); + const DisplayItemClip* clip = aBuilder->ClipState().GetCurrentCombinedClip(aBuilder); + bool borderBoxHasRoundedCorners = + nsLayoutUtils::HasNonZeroCorner(aFrame->StyleBorder()->mBorderRadius); + if (clip) { + borderBox = clip->ApplyNonRoundedIntersection(borderBox); + if (clip->GetRoundedRectCount() > 0) { + borderBoxHasRoundedCorners = true; + } + } + if (borderBoxHasRoundedCorners || + (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) { + mMaybeHitRegion.Or(mMaybeHitRegion, borderBox); + } else { + mHitRegion.Or(mHitRegion, borderBox); + } + if (aBuilder->GetAncestorHasTouchEventHandler()) { + mDispatchToContentHitRegion.Or(mDispatchToContentHitRegion, borderBox); + } +} + +void +nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) { + // Note: Because we exist, we know that the caret is visible, so we don't + // need to check for the caret's visibility. + mCaret->PaintCaret(aBuilder, aCtx, mFrame, ToReferenceFrame()); +} + +bool +nsDisplayBorder::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion)) { + return false; + } + + nsRect paddingRect = mFrame->GetPaddingRect() - mFrame->GetPosition() + + ToReferenceFrame(); + const nsStyleBorder *styleBorder; + if (paddingRect.Contains(aVisibleRegion->GetBounds()) && + !(styleBorder = mFrame->StyleBorder())->IsBorderImageLoaded() && + !nsLayoutUtils::HasNonZeroCorner(styleBorder->mBorderRadius)) { + // the visible region 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 false; + } + + return true; +} + +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(aGeometry); + bool snap; + if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) || + !geometry->mContentRect.IsEqualInterior(GetContentRect())) { + // We can probably get away with only invalidating the difference + // between the border and padding rects, but the XUL ui at least + // is apparently painting a background with this? + aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds); + } +} + +void +nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) { + nsPoint offset = ToReferenceFrame(); + nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame, + mVisibleRect, + nsRect(offset, mFrame->GetSize()), + mFrame->StyleContext(), + mFrame->GetSkipSides()); +} + +nsRect +nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + *aSnap = true; + return CalculateBounds(*mFrame->StyleBorder()); +} + +nsRect +nsDisplayBorder::CalculateBounds(const nsStyleBorder& aStyleBorder) +{ + nsRect borderBounds(ToReferenceFrame(), mFrame->GetSize()); + if (aStyleBorder.IsBorderImageLoaded()) { + borderBounds.Inflate(aStyleBorder.GetImageOutset()); + return borderBounds; + } else { + nsMargin border = aStyleBorder.GetComputedBorder(); + nsRect result; + if (border.top > 0) { + result = nsRect(borderBounds.X(), borderBounds.Y(), borderBounds.Width(), border.top); + } + if (border.right > 0) { + result.UnionRect(result, nsRect(borderBounds.XMost() - border.right, borderBounds.Y(), border.right, borderBounds.Height())); + } + if (border.bottom > 0) { + result.UnionRect(result, nsRect(borderBounds.X(), borderBounds.YMost() - border.bottom, borderBounds.Width(), border.bottom)); + } + if (border.left > 0) { + result.UnionRect(result, nsRect(borderBounds.X(), borderBounds.Y(), border.left, borderBounds.Height())); + } + + return result; + } +} + +// Given a region, compute a conservative approximation to it as a list +// of rectangles that aren't vertically adjacent (i.e., vertically +// adjacent or overlapping rectangles are combined). +// Right now this is only approximate, some vertically overlapping rectangles +// aren't guaranteed to be combined. +static void +ComputeDisjointRectangles(const nsRegion& aRegion, + nsTArray* aRects) { + nscoord accumulationMargin = nsPresContext::CSSPixelsToAppUnits(25); + nsRect accumulated; + nsRegionRectIterator iter(aRegion); + while (true) { + const nsRect* r = iter.Next(); + if (r && !accumulated.IsEmpty() && + accumulated.YMost() >= r->y - accumulationMargin) { + accumulated.UnionRect(accumulated, *r); + continue; + } + + if (!accumulated.IsEmpty()) { + aRects->AppendElement(accumulated); + accumulated.SetEmpty(); + } + + if (!r) + break; + + accumulated = *r; + } +} + +void +nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) { + nsPoint offset = ToReferenceFrame(); + nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset; + nsPresContext* presContext = mFrame->PresContext(); + nsAutoTArray rects; + ComputeDisjointRectangles(mVisibleRegion, &rects); + + PROFILER_LABEL("nsDisplayBoxShadowOuter", "Paint"); + for (uint32_t i = 0; i < rects.Length(); ++i) { + aCtx->PushState(); + aCtx->IntersectClip(rects[i]); + nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame, + borderRect, rects[i], mOpacity); + aCtx->PopState(); + } +} + +nsRect +nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) { + *aSnap = false; + return mBounds; +} + +nsRect +nsDisplayBoxShadowOuter::GetBoundsInternal() { + return nsLayoutUtils::GetBoxShadowRectForFrame(mFrame, mFrame->GetSize()) + + ToReferenceFrame(); +} + +bool +nsDisplayBoxShadowOuter::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion)) { + return false; + } + + // Store the actual visible region + mVisibleRegion.And(*aVisibleRegion, mVisibleRect); + + nsPoint origin = ToReferenceFrame(); + nsRect visibleBounds = aVisibleRegion->GetBounds(); + nsRect frameRect(origin, mFrame->GetSize()); + if (!frameRect.Contains(visibleBounds)) + return true; + + // 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 false; + + return !RoundedRectContainsRect(frameRect, twipsRadii, visibleBounds); +} + +void +nsDisplayBoxShadowOuter::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder, + const nsDisplayItemGeometry* aGeometry, + nsRegion* aInvalidRegion) +{ + const nsDisplayItemGenericGeometry* geometry = + static_cast(aGeometry); + bool snap; + if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) || + !geometry->mBorderRect.IsEqualInterior(GetBorderRect())) { + nsRegion oldShadow, newShadow; + nscoord dontCare[8]; + bool hasBorderRadius = mFrame->GetBorderRadii(dontCare); + if (hasBorderRadius) { + // If we have rounded corners then we need to invalidate the frame area + // too since we paint into it. + oldShadow = geometry->mBounds; + newShadow = GetBounds(aBuilder, &snap); + } else { + oldShadow = oldShadow.Sub(geometry->mBounds, geometry->mBorderRect); + newShadow = newShadow.Sub(GetBounds(aBuilder, &snap), GetBorderRect()); + } + aInvalidRegion->Or(oldShadow, newShadow); + } +} + + +void +nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) { + nsPoint offset = ToReferenceFrame(); + nsRect borderRect = nsRect(offset, mFrame->GetSize()); + nsPresContext* presContext = mFrame->PresContext(); + nsAutoTArray rects; + ComputeDisjointRectangles(mVisibleRegion, &rects); + + PROFILER_LABEL("nsDisplayBoxShadowInner", "Paint"); + for (uint32_t i = 0; i < rects.Length(); ++i) { + aCtx->PushState(); + aCtx->IntersectClip(rects[i]); + nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame, + borderRect, rects[i]); + aCtx->PopState(); + } +} + +bool +nsDisplayBoxShadowInner::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + if (!nsDisplayItem::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion)) { + return false; + } + + // Store the actual visible region + mVisibleRegion.And(*aVisibleRegion, mVisibleRect); + return true; +} + +nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList) + : nsDisplayItem(aBuilder, aFrame) + , mOverrideZIndex(0) +{ + mList.AppendToTop(aList); + UpdateBounds(aBuilder); + + if (!aFrame || !aFrame->IsTransformed()) { + return; + } + + // If the frame is a preserve-3d parent, then we will create transforms + // inside this list afterwards (see WrapPreserve3DList in nsFrame.cpp). + // In this case we will always be outside of the transform, so share + // our parents reference frame. + if (aFrame->Preserves3DChildren()) { + mReferenceFrame = + aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame)); + mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame); + 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). + // + // Preserve-3d can cause us to have multiple nsDisplayTransform + // children. + nsDisplayItem *i = mList.GetBottom(); + if (i && (!i->GetAbove() || i->GetType() == TYPE_TRANSFORM) && + i->Frame() == mFrame) { + mReferenceFrame = i->ReferenceFrame(); + mToReferenceFrame = i->ToReferenceFrame(); + } +} + +nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayItem* aItem) + : nsDisplayItem(aBuilder, aFrame) + , mOverrideZIndex(0) +{ + mList.AppendToTop(aItem); + UpdateBounds(aBuilder); + + if (!aFrame || !aFrame->IsTransformed()) { + return; + } + + if (aFrame->Preserves3DChildren()) { + mReferenceFrame = + aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame)); + mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame); + return; + } + + // See the previous nsDisplayWrapList constructor + if (aItem->Frame() == aFrame) { + mReferenceFrame = aItem->ReferenceFrame(); + mToReferenceFrame = aItem->ToReferenceFrame(); + } +} + +nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayItem* aItem, + const nsIFrame* aReferenceFrame, + const nsPoint& aToReferenceFrame) + : nsDisplayItem(aBuilder, aFrame, aReferenceFrame, aToReferenceFrame) + , mOverrideZIndex(0) +{ + mList.AppendToTop(aItem); + mBounds = mList.GetBounds(aBuilder); +} + +nsDisplayWrapList::~nsDisplayWrapList() { + mList.DeleteAll(); +} + +void +nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect, + HitTestState* aState, nsTArray *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, + const nsRect& aAllowVisibleRegionExpansion) { + // 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, + aAllowVisibleRegionExpansion); + + 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; +} + +bool nsDisplayWrapList::IsVaryingRelativeToMovingFrame(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame) { + NS_WARNING("nsDisplayWrapList::IsVaryingRelativeToMovingFrame called unexpectedly"); + // We could try to do something but let's conservatively just return true. + return true; +} + +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 + * ThebesLayer --- GetLayerState returns LAYER_INACTIVE or LAYER_NONE, + * and they all have the expected animated geometry root. + */ +static LayerState +RequiredLayerStateForChildren(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters, + const nsDisplayList& aList, + nsIFrame* aExpectedAnimatedGeometryRootForChildren) +{ + LayerState result = LAYER_INACTIVE; + for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) { + if (result == LAYER_INACTIVE && + nsLayoutUtils::GetAnimatedGeometryRootFor(i, aBuilder) != + aExpectedAnimatedGeometryRootForChildren) { + result = LAYER_ACTIVE; + } + + LayerState state = i->GetLayerState(aBuilder, aManager, aParameters); + if ((state == LAYER_ACTIVE || state == LAYER_ACTIVE_FORCE) && + state > result) { + result = state; + } + if (state == LAYER_ACTIVE_EMPTY && state > result) { + result = LAYER_ACTIVE_FORCE; + } + if (state == LAYER_NONE) { + nsDisplayList* list = i->GetSameCoordinateSystemChildren(); + if (list) { + LayerState childState = + RequiredLayerStateForChildren(aBuilder, aManager, aParameters, *list, + aExpectedAnimatedGeometryRootForChildren); + if (childState > result) { + result = childState; + } + } + } + } + return result; +} + +nsRect nsDisplayWrapList::GetComponentAlphaBounds(nsDisplayListBuilder* aBuilder) +{ + nsRect bounds; + for (nsDisplayItem* i = mList.GetBottom(); i; i = i->GetAbove()) { + bounds.UnionRect(bounds, i->GetComponentAlphaBounds(aBuilder)); + } + return bounds; +} + +static nsresult +WrapDisplayList(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, + nsDisplayList* aList, nsDisplayWrapper* aWrapper) { + if (!aList->GetTop()) + return NS_OK; + nsDisplayItem* item = aWrapper->WrapList(aBuilder, aFrame, aList); + if (!item) + return NS_ERROR_OUT_OF_MEMORY; + // aList was emptied + aList->AppendToTop(item); + return NS_OK; +} + +static nsresult +WrapEachDisplayItem(nsDisplayListBuilder* aBuilder, + nsDisplayList* aList, nsDisplayWrapper* aWrapper) { + nsDisplayList newList; + nsDisplayItem* item; + while ((item = aList->RemoveBottom())) { + item = aWrapper->WrapItem(aBuilder, item); + if (!item) + return NS_ERROR_OUT_OF_MEMORY; + newList.AppendToTop(item); + } + // aList was emptied + aList->AppendToTop(&newList); + return NS_OK; +} + +nsresult nsDisplayWrapper::WrapLists(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, const nsDisplayListSet& aIn, const nsDisplayListSet& aOut) +{ + nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn); + NS_ENSURE_SUCCESS(rv, rv); + + if (&aOut == &aIn) + return NS_OK; + aOut.BorderBackground()->AppendToTop(aIn.BorderBackground()); + aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds()); + aOut.Floats()->AppendToTop(aIn.Floats()); + aOut.Content()->AppendToTop(aIn.Content()); + aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants()); + aOut.Outlines()->AppendToTop(aIn.Outlines()); + return NS_OK; +} + +nsresult nsDisplayWrapper::WrapListsInPlace(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, const nsDisplayListSet& aLists) +{ + nsresult rv; + if (WrapBorderBackground()) { + // Our border-backgrounds are in-flow + rv = WrapDisplayList(aBuilder, aFrame, aLists.BorderBackground(), this); + NS_ENSURE_SUCCESS(rv, rv); + } + // Our block border-backgrounds are in-flow + rv = WrapDisplayList(aBuilder, aFrame, aLists.BlockBorderBackgrounds(), this); + NS_ENSURE_SUCCESS(rv, rv); + // The floats are not in flow + rv = WrapEachDisplayItem(aBuilder, aLists.Floats(), this); + NS_ENSURE_SUCCESS(rv, rv); + // Our child content is in flow + rv = WrapDisplayList(aBuilder, aFrame, aLists.Content(), this); + NS_ENSURE_SUCCESS(rv, rv); + // The positioned descendants may not be in-flow + rv = WrapEachDisplayItem(aBuilder, aLists.PositionedDescendants(), this); + NS_ENSURE_SUCCESS(rv, rv); + // The outlines may not be in-flow + return WrapEachDisplayItem(aBuilder, aLists.Outlines(), this); +} + +nsDisplayOpacity::nsDisplayOpacity(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList) + : nsDisplayWrapList(aBuilder, aFrame, aList) { + 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; + // We are never opaque, if our opacity was < 1 then we wouldn't have + // been created. + return nsRegion(); +} + +// nsDisplayOpacity uses layers for rendering +already_AddRefed +nsDisplayOpacity::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + if (mFrame->StyleDisplay()->mOpacity == 0 && mFrame->GetContent() && + !nsLayoutUtils::HasAnimations(mFrame->GetContent(), eCSSProperty_opacity)) { + return nullptr; + } + nsRefPtr container = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + aContainerParameters, nullptr); + if (!container) + return nullptr; + + container->SetOpacity(mFrame->StyleDisplay()->mOpacity); + nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder, + this, mFrame, + eCSSProperty_opacity); + return container.forget(); +} + +/** + * This doesn't take into account layer scaling --- the layer may be + * rendered at a higher (or lower) resolution, affecting the retained layer + * size --- but this should be good enough. + */ +static bool +IsItemTooSmallForActiveLayer(nsDisplayItem* aItem) +{ + nsIntRect visibleDevPixels = aItem->GetVisibleRect().ToOutsidePixels( + aItem->Frame()->PresContext()->AppUnitsPerDevPixel()); + static const int MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS = 16; + return visibleDevPixels.Size() < + nsIntSize(MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS, MIN_ACTIVE_LAYER_SIZE_DEV_PIXELS); +} + +bool +nsDisplayOpacity::NeedsActiveLayer() +{ + if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_opacity) && + !IsItemTooSmallForActiveLayer(this)) + return true; + if (mFrame->GetContent()) { + if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(), + eCSSProperty_opacity)) { + return true; + } + } + return false; +} + +bool +nsDisplayOpacity::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) +{ + if (NeedsActiveLayer()) + return false; + + nsDisplayItem* child = mList.GetBottom(); + // Only try folding our opacity down if we have a single + // child. We could potentially do this also if we had multiple + // children as long as they don't overlap. + if (!child || child->GetAbove()) { + return false; + } + + return child->ApplyOpacity(aBuilder, mFrame->StyleDisplay()->mOpacity, mClip); +} + +nsDisplayItem::LayerState +nsDisplayOpacity::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) { + if (NeedsActiveLayer()) + return LAYER_ACTIVE; + + return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, mList, + nsLayoutUtils::GetAnimatedGeometryRootFor(this, aBuilder)); +} + +bool +nsDisplayOpacity::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + // 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); + nsRect allowExpansion = bounds.Intersect(aAllowVisibleRegionExpansion); + return + nsDisplayWrapList::ComputeVisibility(aBuilder, &visibleUnderChildren, + allowExpansion); +} + +bool nsDisplayOpacity::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { + if (aItem->GetType() != TYPE_OPACITY) + return false; + // items for the same content element should be merged into a single + // compositing group + // aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity + if (aItem->Frame()->GetContent() != mFrame->GetContent()) + return false; + if (aItem->GetClip() != GetClip()) + return false; + MergeFromTrackingMergedFrames(static_cast(aItem)); + return true; +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplayOpacity::WriteDebugInfo(nsACString& aTo) +{ + aTo += nsPrintfCString(" (opacity %f)", mFrame->StyleDisplay()->mOpacity); +} +#endif + +nsDisplayMixBlendMode::nsDisplayMixBlendMode(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + uint32_t aFlags) +: nsDisplayWrapList(aBuilder, aFrame, aList) { + MOZ_COUNT_CTOR(nsDisplayMixBlendMode); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayMixBlendMode::~nsDisplayMixBlendMode() { + MOZ_COUNT_DTOR(nsDisplayMixBlendMode); +} +#endif + +nsRegion nsDisplayMixBlendMode::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, + bool* aSnap) { + *aSnap = false; + // We are never considered opaque + return nsRegion(); +} + +// nsDisplayMixBlendMode uses layers for rendering +already_AddRefed +nsDisplayMixBlendMode::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + ContainerLayerParameters newContainerParameters = aContainerParameters; + newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true; + + nsRefPtr container = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + newContainerParameters, nullptr); + if (!container) { + return nullptr; + } + + container->DeprecatedSetMixBlendMode(nsCSSRendering::GetGFXBlendMode(mFrame->StyleDisplay()->mMixBlendMode)); + + return container.forget(); +} + +bool nsDisplayMixBlendMode::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + // 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); + nsRect allowExpansion = bounds.Intersect(aAllowVisibleRegionExpansion); + return + nsDisplayWrapList::ComputeVisibility(aBuilder, &visibleUnderChildren, + allowExpansion); +} + +bool nsDisplayMixBlendMode::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { + if (aItem->GetType() != TYPE_MIX_BLEND_MODE) + return false; + // items for the same content element should be merged into a single + // compositing group + // aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity + if (aItem->Frame()->GetContent() != mFrame->GetContent()) + return false; + if (aItem->GetClip() != GetClip()) + return false; + MergeFromTrackingMergedFrames(static_cast(aItem)); + return true; +} + +nsDisplayBlendContainer::nsDisplayBlendContainer(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + uint32_t aFlags) + : nsDisplayWrapList(aBuilder, aFrame, aList) { + MOZ_COUNT_CTOR(nsDisplayBlendContainer); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayBlendContainer::~nsDisplayBlendContainer() { + MOZ_COUNT_DTOR(nsDisplayBlendContainer); +} +#endif + +// nsDisplayBlendContainer uses layers for rendering +already_AddRefed +nsDisplayBlendContainer::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + // turn off anti-aliasing in the parent stacking context because it changes + // how the group is initialized. + ContainerLayerParameters newContainerParameters = aContainerParameters; + newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true; + + nsRefPtr container = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + newContainerParameters, nullptr); + if (!container) { + return nullptr; + } + + container->SetForceIsolatedGroup(true); + return container.forget(); +} + +bool nsDisplayBlendContainer::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { + if (aItem->GetType() != TYPE_BLEND_CONTAINER) + return false; + // items for the same content element should be merged into a single + // compositing group + // aItem->GetUnderlyingFrame() returns non-null because it's nsDisplayOpacity + if (aItem->Frame()->GetContent() != mFrame->GetContent()) + return false; + if (aItem->GetClip() != GetClip()) + return false; + MergeFromTrackingMergedFrames(static_cast(aItem)); + return true; +} + +nsDisplayOwnLayer::nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + uint32_t aFlags, ViewID aScrollTarget) + : nsDisplayWrapList(aBuilder, aFrame, aList) + , mFlags(aFlags) + , mScrollTarget(aScrollTarget) { + MOZ_COUNT_CTOR(nsDisplayOwnLayer); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayOwnLayer::~nsDisplayOwnLayer() { + MOZ_COUNT_DTOR(nsDisplayOwnLayer); +} +#endif + +// nsDisplayOpacity uses layers for rendering +already_AddRefed +nsDisplayOwnLayer::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + nsRefPtr layer = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + aContainerParameters, nullptr); + if (mFlags & VERTICAL_SCROLLBAR) { + layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::VERTICAL); + } + if (mFlags & HORIZONTAL_SCROLLBAR) { + layer->SetScrollbarData(mScrollTarget, Layer::ScrollDirection::HORIZONTAL); + } + + if (mFlags & GENERATE_SUBDOC_INVALIDATIONS) { + mFrame->PresContext()->SetNotifySubDocInvalidationData(layer); + } + return layer.forget(); +} + +nsDisplaySubDocument::nsDisplaySubDocument(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + uint32_t aFlags) + : nsDisplayOwnLayer(aBuilder, aFrame, aList, aFlags) + , mScrollParentId(aBuilder->GetCurrentScrollParentId()) +{ + MOZ_COUNT_CTOR(nsDisplaySubDocument); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplaySubDocument::~nsDisplaySubDocument() { + MOZ_COUNT_DTOR(nsDisplaySubDocument); +} +#endif + +already_AddRefed +nsDisplaySubDocument::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + nsRefPtr layer = nsDisplayOwnLayer::BuildLayer( + aBuilder, aManager, aContainerParameters); + + if (!(mFlags & GENERATE_SCROLLABLE_LAYER)) { + return layer.forget(); + } + + NS_ASSERTION(layer->AsContainerLayer(), "nsDisplayOwnLayer should have made a ContainerLayer"); + if (ContainerLayer* container = layer->AsContainerLayer()) { + nsPresContext* presContext = mFrame->PresContext(); + nsIFrame* rootScrollFrame = presContext->PresShell()->GetRootScrollFrame(); + bool isRootContentDocument = presContext->IsRootContentDocument(); + + bool usingDisplayport = false; + bool usingCriticalDisplayport = false; + nsRect displayport, criticalDisplayport; + ViewID scrollId = FrameMetrics::NULL_SCROLL_ID; + if (rootScrollFrame) { + nsIContent* content = rootScrollFrame->GetContent(); + if (content) { + usingDisplayport = nsLayoutUtils::GetDisplayPort(content, &displayport); + usingCriticalDisplayport = + nsLayoutUtils::GetCriticalDisplayPort(content, &criticalDisplayport); + + if (isRootContentDocument) { + scrollId = nsLayoutUtils::FindOrCreateIDFor(content); + } else { + nsLayoutUtils::FindIDFor(content, &scrollId); + } + } + } + + nsRect viewport = mFrame->GetRect() - + mFrame->GetPosition() + + mFrame->GetOffsetToCrossDoc(ReferenceFrame()); + + container->SetScrollHandoffParentId(mScrollParentId); + RecordFrameMetrics(mFrame, rootScrollFrame, ReferenceFrame(), + container, mList.GetVisibleRect(), viewport, + (usingDisplayport ? &displayport : nullptr), + (usingCriticalDisplayport ? &criticalDisplayport : nullptr), + scrollId, isRootContentDocument, aContainerParameters); + } + + return layer.forget(); +} + +nsRect +nsDisplaySubDocument::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + bool usingDisplayPort = + nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext()); + + if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) { + *aSnap = false; + return mFrame->GetRect() + aBuilder->ToReferenceFrame(mFrame); + } + + return nsDisplayOwnLayer::GetBounds(aBuilder, aSnap); +} + +bool +nsDisplaySubDocument::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) +{ + nsRect displayport; + bool usingDisplayPort = + nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext(), &displayport); + + if (!(mFlags & GENERATE_SCROLLABLE_LAYER) || !usingDisplayPort) { + return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion, + aAllowVisibleRegionExpansion); + } + + 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)); + nsRect allowExpansion = boundedRect.Intersect(aAllowVisibleRegionExpansion); + bool visible = mList.ComputeVisibilityForSublist( + aBuilder, &childVisibleRegion, boundedRect, allowExpansion, + usingDisplayPort ? mFrame : nullptr); + // We 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. + + return visible; +} + +bool +nsDisplaySubDocument::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) +{ + bool usingDisplayPort = + nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext()); + + if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) { + return true; + } + + return nsDisplayOwnLayer::ShouldBuildLayerEvenIfInvisible(aBuilder); +} + +nsRegion +nsDisplaySubDocument::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + bool usingDisplayPort = + nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext()); + + if ((mFlags & GENERATE_SCROLLABLE_LAYER) && usingDisplayPort) { + *aSnap = false; + return nsRegion(); + } + + return nsDisplayOwnLayer::GetOpaqueRegion(aBuilder, aSnap); +} + +nsDisplayResolution::nsDisplayResolution(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + uint32_t aFlags) + : nsDisplaySubDocument(aBuilder, aFrame, aList, aFlags) { + MOZ_COUNT_CTOR(nsDisplayResolution); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayResolution::~nsDisplayResolution() { + MOZ_COUNT_DTOR(nsDisplayResolution); +} +#endif + +already_AddRefed +nsDisplayResolution::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + nsIPresShell* presShell = mFrame->PresContext()->PresShell(); + ContainerLayerParameters containerParameters( + presShell->GetXResolution(), presShell->GetYResolution(), nsIntPoint(), + aContainerParameters); + + nsRefPtr layer = nsDisplaySubDocument::BuildLayer( + aBuilder, aManager, containerParameters); + layer->SetPostScale(1.0f / presShell->GetXResolution(), + 1.0f / presShell->GetYResolution()); + return layer.forget(); +} + +nsDisplayStickyPosition::nsDisplayStickyPosition(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, + nsDisplayList* aList) + : nsDisplayOwnLayer(aBuilder, aFrame, aList) +{ + MOZ_COUNT_CTOR(nsDisplayStickyPosition); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayStickyPosition::~nsDisplayStickyPosition() { + MOZ_COUNT_DTOR(nsDisplayStickyPosition); +} +#endif + +already_AddRefed +nsDisplayStickyPosition::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + nsRefPtr layer = + nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, aContainerParameters); + + StickyScrollContainer* stickyScrollContainer = StickyScrollContainer:: + GetStickyScrollContainerForFrame(mFrame); + if (!stickyScrollContainer) { + return layer.forget(); + } + + nsIFrame* scrollFrame = do_QueryFrame(stickyScrollContainer->ScrollFrame()); + nsPresContext* presContext = scrollFrame->PresContext(); + + // Sticky position frames whose scroll frame is the root scroll frame are + // reflowed into the scroll-port size if one has been set. + nsSize scrollFrameSize = scrollFrame->GetSize(); + if (scrollFrame == presContext->PresShell()->GetRootScrollFrame() && + presContext->PresShell()->IsScrollPositionClampingScrollPortSizeSet()) { + scrollFrameSize = presContext->PresShell()-> + GetScrollPositionClampingScrollPortSize(); + } + + nsLayoutUtils::SetFixedPositionLayerData(layer, scrollFrame, + nsRect(scrollFrame->GetOffsetToCrossDoc(ReferenceFrame()), scrollFrameSize), + mFrame, presContext, aContainerParameters); + + ViewID scrollId = nsLayoutUtils::FindOrCreateIDFor( + stickyScrollContainer->ScrollFrame()->GetScrolledFrame()->GetContent()); + + float factor = presContext->AppUnitsPerDevPixel(); + nsRect outer; + nsRect inner; + stickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner); + LayerRect stickyOuter(NSAppUnitsToFloatPixels(outer.x, factor) * + aContainerParameters.mXScale, + NSAppUnitsToFloatPixels(outer.y, factor) * + aContainerParameters.mYScale, + NSAppUnitsToFloatPixels(outer.width, factor) * + aContainerParameters.mXScale, + NSAppUnitsToFloatPixels(outer.height, factor) * + aContainerParameters.mYScale); + LayerRect stickyInner(NSAppUnitsToFloatPixels(inner.x, factor) * + aContainerParameters.mXScale, + NSAppUnitsToFloatPixels(inner.y, factor) * + aContainerParameters.mYScale, + NSAppUnitsToFloatPixels(inner.width, factor) * + aContainerParameters.mXScale, + NSAppUnitsToFloatPixels(inner.height, factor) * + aContainerParameters.mYScale); + layer->SetStickyPositionData(scrollId, stickyOuter, stickyInner); + + return layer.forget(); +} + +bool nsDisplayStickyPosition::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) { + if (aItem->GetType() != TYPE_STICKY_POSITION) + return false; + // Items with the same fixed position frame can be merged. + nsDisplayStickyPosition* other = static_cast(aItem); + if (other->mFrame != mFrame) + return false; + if (aItem->GetClip() != GetClip()) + return false; + MergeFromTrackingMergedFrames(other); + return true; +} + +nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder, + nsDisplayList* aList, + nsIFrame* aForFrame, + nsIFrame* aScrolledFrame, + nsIFrame* aScrollFrame) + : nsDisplayWrapList(aBuilder, aForFrame, aList) + , mScrollFrame(aScrollFrame) + , mScrolledFrame(aScrolledFrame) + , mScrollParentId(aBuilder->GetCurrentScrollParentId()) +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_CTOR(nsDisplayScrollLayer); +#endif + + NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(), + "Need a child frame with content"); +} + +nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder, + nsDisplayItem* aItem, + nsIFrame* aForFrame, + nsIFrame* aScrolledFrame, + nsIFrame* aScrollFrame) + : nsDisplayWrapList(aBuilder, aForFrame, aItem) + , mScrollFrame(aScrollFrame) + , mScrolledFrame(aScrolledFrame) + , mScrollParentId(aBuilder->GetCurrentScrollParentId()) +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_CTOR(nsDisplayScrollLayer); +#endif + + NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(), + "Need a child frame with content"); +} + +nsDisplayScrollLayer::nsDisplayScrollLayer(nsDisplayListBuilder* aBuilder, + nsIFrame* aForFrame, + nsIFrame* aScrolledFrame, + nsIFrame* aScrollFrame) + : nsDisplayWrapList(aBuilder, aForFrame) + , mScrollFrame(aScrollFrame) + , mScrolledFrame(aScrolledFrame) + , mScrollParentId(aBuilder->GetCurrentScrollParentId()) +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_CTOR(nsDisplayScrollLayer); +#endif + + NS_ASSERTION(mScrolledFrame && mScrolledFrame->GetContent(), + "Need a child frame with content"); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayScrollLayer::~nsDisplayScrollLayer() +{ + MOZ_COUNT_DTOR(nsDisplayScrollLayer); +} +#endif + +nsRect +nsDisplayScrollLayer::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + nsIScrollableFrame* sf = do_QueryFrame(mScrollFrame); + if (sf) { + *aSnap = false; + return sf->GetScrollPortRect() + aBuilder->ToReferenceFrame(mScrollFrame); + } + return nsDisplayWrapList::GetBounds(aBuilder, aSnap); +} + +already_AddRefed +nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) { + nsRefPtr layer = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + aContainerParameters, nullptr); + + // Get the already set unique ID for scrolling this content remotely. + // Or, if not set, generate a new ID. + nsIContent* content = mScrolledFrame->GetContent(); + ViewID scrollId = nsLayoutUtils::FindOrCreateIDFor(content); + + nsRect viewport = mScrollFrame->GetRect() - + mScrollFrame->GetPosition() + + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame()); + + bool usingDisplayport = false; + bool usingCriticalDisplayport = false; + nsRect displayport, criticalDisplayport; + if (content) { + usingDisplayport = nsLayoutUtils::GetDisplayPort(content, &displayport); + usingCriticalDisplayport = + nsLayoutUtils::GetCriticalDisplayPort(content, &criticalDisplayport); + } + layer->SetScrollHandoffParentId(mScrollParentId); + RecordFrameMetrics(mScrolledFrame, mScrollFrame, ReferenceFrame(), layer, + mList.GetVisibleRect(), viewport, + (usingDisplayport ? &displayport : nullptr), + (usingCriticalDisplayport ? &criticalDisplayport : nullptr), + scrollId, false, aContainerParameters); + + return layer.forget(); +} + +bool +nsDisplayScrollLayer::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) +{ + if (nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), nullptr)) { + return true; + } + + return nsDisplayWrapList::ShouldBuildLayerEvenIfInvisible(aBuilder); +} + +bool +nsDisplayScrollLayer::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) +{ + nsRect displayport; + bool usingDisplayPort = + nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport); + nsRegion childVisibleRegion; + if (usingDisplayPort) { + // 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 + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame()); + } else { + bool snap; + childVisibleRegion = GetBounds(aBuilder, &snap); + } + + nsRect boundedRect = + childVisibleRegion.GetBounds().Intersect(mList.GetBounds(aBuilder)); + nsRect allowExpansion = boundedRect.Intersect(aAllowVisibleRegionExpansion); + bool visible = mList.ComputeVisibilityForSublist( + aBuilder, &childVisibleRegion, boundedRect, allowExpansion, + usingDisplayPort ? mScrollFrame : nullptr); + // We 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. + + return visible; +} + +LayerState +nsDisplayScrollLayer::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) +{ + // Force this as a layer so we can scroll asynchronously. + // This causes incorrect rendering for rounded clips! + return LAYER_ACTIVE_FORCE; +} + +// Check if we are going to clip an abs pos item that we don't contain. +// Root scroll frames clip all their descendants, so we don't need to worry +// about them. +bool +WouldCauseIncorrectClippingOnAbsPosItem(nsDisplayListBuilder* aBuilder, + nsDisplayScrollLayer* aItem) +{ + nsIFrame* scrollFrame = aItem->GetScrollFrame(); + nsIPresShell* presShell = scrollFrame->PresContext()->PresShell(); + if (scrollFrame == presShell->GetRootScrollFrame()) { + return false; + } + nsIFrame* scrolledFrame = aItem->GetScrolledFrame(); + nsIFrame* frame = aItem->Frame(); + if (frame == scrolledFrame || !frame->IsAbsolutelyPositioned() || + nsLayoutUtils::IsAncestorFrameCrossDoc(scrollFrame, frame, presShell->GetRootFrame())) { + return false; + } + if (!aItem->GetClip().IsRectAffectedByClip(aItem->GetChildren()->GetBounds(aBuilder))) { + return false; + } + return true; +} + +bool +nsDisplayScrollLayer::TryMerge(nsDisplayListBuilder* aBuilder, + nsDisplayItem* aItem) +{ + if (aItem->GetType() != TYPE_SCROLL_LAYER) { + return false; + } + nsDisplayScrollLayer* other = static_cast(aItem); + if (other->mScrolledFrame != this->mScrolledFrame) { + return false; + } + if (aItem->GetClip() != GetClip()) { + return false; + } + + if (WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, this) || + WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, other)) { + return false; + } + + NS_ASSERTION(other->mReferenceFrame == mReferenceFrame, + "Must have the same reference frame!"); + + FrameProperties props = mScrolledFrame->Properties(); + props.Set(nsIFrame::ScrollLayerCount(), + reinterpret_cast(GetScrollLayerCount() - 1)); + + // Swap frames with the other item before doing MergeFrom. + // XXX - This ensures that the frame associated with a scroll layer after + // merging is the first, rather than the last. This tends to change less, + // ensuring we're more likely to retain the associated gfx layer. + // See Bug 729534 and Bug 731641. + nsIFrame* tmp = mFrame; + mFrame = other->mFrame; + other->mFrame = tmp; + MergeFromTrackingMergedFrames(other); + return true; +} + +void +PropagateClip(nsDisplayListBuilder* aBuilder, const DisplayItemClip& aClip, + nsDisplayList* aList) +{ + for (nsDisplayItem* i = aList->GetBottom(); i != nullptr; i = i->GetAbove()) { + DisplayItemClip clip(i->GetClip()); + clip.IntersectWith(aClip); + i->SetClip(aBuilder, clip); + nsDisplayList* list = i->GetSameCoordinateSystemChildren(); + if (list) { + PropagateClip(aBuilder, aClip, list); + } + } +} + +bool +nsDisplayScrollLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) +{ + bool badAbsPosClip = WouldCauseIncorrectClippingOnAbsPosItem(aBuilder, this); + if (GetScrollLayerCount() > 1 || badAbsPosClip) { + // Propagate our clip to our children. The clip for the scroll frame is + // on this item, but not our child items so that they can draw non-visible + // parts of the display port. But if we are flattening we failed and can't + // draw the extra content, so it needs to be clipped. + // But don't induce our clip on abs pos frames that we shouldn't be clipping. + if (!badAbsPosClip) { + PropagateClip(aBuilder, GetClip(), &mList); + } + return true; + } + if (mFrame != mScrolledFrame) { + mMergedFrames.AppendElement(mFrame); + mFrame = mScrolledFrame; + } + return false; +} + +intptr_t +nsDisplayScrollLayer::GetScrollLayerCount() +{ + FrameProperties props = mScrolledFrame->Properties(); +#ifdef DEBUG + bool hasCount = false; + intptr_t result = reinterpret_cast( + props.Get(nsIFrame::ScrollLayerCount(), &hasCount)); + // If this aborts, then the property was either not added before scroll + // layers were created or the property was deleted to early. If the latter, + // make sure that nsDisplayScrollInfoLayer is on the bottom of the list so + // that it is processed last. + NS_ABORT_IF_FALSE(hasCount, "nsDisplayScrollLayer should always be defined"); + return result; +#else + return reinterpret_cast(props.Get(nsIFrame::ScrollLayerCount())); +#endif +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplayScrollLayer::WriteDebugInfo(nsACString& aTo) +{ + aTo += nsPrintfCString(" (scrollframe %p scrolledframe %p)", + mScrollFrame, mScrolledFrame); +} +#endif + +nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer( + nsDisplayListBuilder* aBuilder, + nsIFrame* aScrolledFrame, + nsIFrame* aScrollFrame) + : nsDisplayScrollLayer(aBuilder, aScrollFrame, aScrolledFrame, aScrollFrame) +{ +#ifdef NS_BUILD_REFCNT_LOGGING + MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer); +#endif +} + +nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer() +{ + FrameProperties props = mScrolledFrame->Properties(); + props.Remove(nsIFrame::ScrollLayerCount()); + MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer); +} + +nsRect +nsDisplayScrollInfoLayer::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + return nsDisplayWrapList::GetBounds(aBuilder, aSnap); +} + +LayerState +nsDisplayScrollInfoLayer::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) +{ + return LAYER_ACTIVE_EMPTY; +} + +bool +nsDisplayScrollInfoLayer::TryMerge(nsDisplayListBuilder* aBuilder, + nsDisplayItem* aItem) +{ + return false; +} + +bool +nsDisplayScrollInfoLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) +{ + // Layer metadata for a particular scroll frame needs to be unique. Only + // one nsDisplayScrollLayer (with rendered content) or one + // nsDisplayScrollInfoLayer (with only the metadata) should survive the + // visibility computation. + return GetScrollLayerCount() == 1; +} + +nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList, + int32_t aAPD, int32_t aParentAPD, + uint32_t aFlags) + : nsDisplaySubDocument(aBuilder, aFrame, aList, aFlags) + , mAPD(aAPD), mParentAPD(aParentAPD) { + MOZ_COUNT_CTOR(nsDisplayZoom); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplayZoom::~nsDisplayZoom() { + MOZ_COUNT_DTOR(nsDisplayZoom); +} +#endif + +nsRect nsDisplayZoom::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) +{ + nsRect bounds = nsDisplaySubDocument::GetBounds(aBuilder, aSnap); + *aSnap = false; + return bounds.ConvertAppUnitsRoundOut(mAPD, mParentAPD); +} + +void nsDisplayZoom::HitTest(nsDisplayListBuilder *aBuilder, + const nsRect& aRect, + HitTestState *aState, + nsTArray *aOutFrames) +{ + nsRect rect; + // A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1 + // rect as well instead of possibly rounding the width or height to zero. + if (aRect.width == 1 && aRect.height == 1) { + rect.MoveTo(aRect.TopLeft().ConvertAppUnits(mParentAPD, mAPD)); + rect.width = rect.height = 1; + } else { + rect = aRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD); + } + mList.HitTest(aBuilder, rect, aState, aOutFrames); +} + +void nsDisplayZoom::Paint(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx) +{ + mList.PaintForFrame(aBuilder, aCtx, mFrame, nsDisplayList::PAINT_DEFAULT); +} + +bool nsDisplayZoom::ComputeVisibility(nsDisplayListBuilder *aBuilder, + nsRegion *aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) +{ + // Convert the passed in visible region to our appunits. + nsRegion visibleRegion; + // mVisibleRect has been clipped to GetClippedBounds + visibleRegion.And(*aVisibleRegion, mVisibleRect); + visibleRegion = visibleRegion.ConvertAppUnitsRoundOut(mParentAPD, mAPD); + nsRegion originalVisibleRegion = visibleRegion; + + nsRect transformedVisibleRect = + mVisibleRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD); + nsRect allowExpansion = + aAllowVisibleRegionExpansion.ConvertAppUnitsRoundIn(mParentAPD, mAPD); + bool retval; + // If we are to generate a scrollable layer we call + // nsDisplaySubDocument::ComputeVisibility to make the necessary adjustments + // for ComputeVisibility, it does all it's calculations in the child APD. + bool usingDisplayPort = + nsLayoutUtils::ViewportHasDisplayPort(mFrame->PresContext()); + if (!(mFlags & GENERATE_SCROLLABLE_LAYER) || !usingDisplayPort) { + retval = + mList.ComputeVisibilityForSublist(aBuilder, &visibleRegion, + transformedVisibleRect, + allowExpansion); + } else { + retval = + nsDisplaySubDocument::ComputeVisibility(aBuilder, &visibleRegion, + allowExpansion); + } + + nsRegion removed; + // removed = originalVisibleRegion - visibleRegion + removed.Sub(originalVisibleRegion, visibleRegion); + // Convert removed region to parent appunits. + removed = removed.ConvertAppUnitsRoundIn(mAPD, mParentAPD); + // aVisibleRegion = aVisibleRegion - removed (modulo any simplifications + // SubtractFromVisibleRegion does) + aBuilder->SubtractFromVisibleRegion(aVisibleRegion, removed); + + return retval; +} + +/////////////////////////////////////////////////// +// nsDisplayTransform Implementation +// + +// Write #define UNIFIED_CONTINUATIONS here to have the transform property try +// to transform content with continuations as one unified block instead of +// several smaller ones. This is currently disabled because it doesn't work +// correctly, since when the frames are initially being reflowed, their +// continuations all compute their bounding rects independently of each other +// and consequently get the wrong value. Write #define DEBUG_HIT here to have +// the nsDisplayTransform class dump out a bunch of information about hit +// detection. +#undef UNIFIED_CONTINUATIONS +#undef DEBUG_HIT + +/* Returns the bounds of a frame as defined for transforms. If + * UNIFIED_CONTINUATIONS is not defined, this is simply the frame's bounding + * rectangle, translated to the origin. Otherwise, returns the smallest + * rectangle containing a frame and all of its continuations. For example, if + * there is a element with several continuations split over several + * lines, this function will return the rectangle containing all of those + * continuations. This rectangle is relative to the origin of the frame's local + * coordinate space. + */ +#ifndef UNIFIED_CONTINUATIONS + +nsRect +nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame) +{ + NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!"); + + if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) { + // TODO: SVG needs to define what percentage translations resolve against. + return nsRect(); + } + + return nsRect(nsPoint(0, 0), aFrame->GetSize()); +} + +#else + +nsRect +nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame) +{ + NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!"); + + nsRect result; + + if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) { + // TODO: SVG needs to define what percentage translations resolve against. + return result; + } + + /* Iterate through the continuation list, unioning together all the + * bounding rects. + */ + for (const nsIFrame *currFrame = aFrame->FirstContinuation(); + currFrame != nullptr; + currFrame = currFrame->GetNextContinuation()) + { + /* Get the frame rect in local coordinates, then translate back to the + * original coordinates. + */ + result.UnionRect(result, nsRect(currFrame->GetOffsetTo(aFrame), + currFrame->GetSize())); + } + + return result; +} + +#endif + +nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame, + nsDisplayList *aList, ComputeTransformFunction aTransformGetter, + uint32_t aIndex) + : nsDisplayItem(aBuilder, aFrame) + , mStoredList(aBuilder, aFrame, aList) + , mTransformGetter(aTransformGetter) + , mIndex(aIndex) +{ + MOZ_COUNT_CTOR(nsDisplayTransform); + NS_ABORT_IF_FALSE(aFrame, "Must have a frame!"); + NS_ABORT_IF_FALSE(!aFrame->IsTransformed(), "Can't specify a transform getter for a transformed frame!"); + mStoredList.SetClip(aBuilder, DisplayItemClip::NoClip()); +} + +nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame, + nsDisplayList *aList, uint32_t aIndex) + : nsDisplayItem(aBuilder, aFrame) + , mStoredList(aBuilder, aFrame, aList) + , mTransformGetter(nullptr) + , mIndex(aIndex) +{ + MOZ_COUNT_CTOR(nsDisplayTransform); + NS_ABORT_IF_FALSE(aFrame, "Must have a frame!"); + mReferenceFrame = + aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame)); + mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame); + mStoredList.SetClip(aBuilder, DisplayItemClip::NoClip()); +} + +nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder, nsIFrame *aFrame, + nsDisplayItem *aItem, uint32_t aIndex) + : nsDisplayItem(aBuilder, aFrame) + , mStoredList(aBuilder, aFrame, aItem) + , mTransformGetter(nullptr) + , mIndex(aIndex) +{ + MOZ_COUNT_CTOR(nsDisplayTransform); + NS_ABORT_IF_FALSE(aFrame, "Must have a frame!"); + mReferenceFrame = + aBuilder->FindReferenceFrameFor(GetTransformRootFrame(aFrame)); + mToReferenceFrame = aFrame->GetOffsetToCrossDoc(mReferenceFrame); + mStoredList.SetClip(aBuilder, DisplayItemClip::NoClip()); +} + +/* Returns the delta specified by the -moz-transform-origin property. + * This is a positive delta, meaning that it indicates the direction to move + * to get from (0, 0) of the frame to the transform origin. This function is + * called off the main thread. + */ +/* static */ gfxPoint3D +nsDisplayTransform::GetDeltaToTransformOrigin(const nsIFrame* aFrame, + float aAppUnitsPerPixel, + const nsRect* aBoundsOverride) +{ + NS_PRECONDITION(aFrame, "Can't get delta for a null frame!"); + NS_PRECONDITION(aFrame->IsTransformed() || aFrame->StyleDisplay()->BackfaceIsHidden(), + "Shouldn't get a delta for an untransformed frame!"); + + if (!aFrame->IsTransformed()) { + return gfxPoint3D(); + } + + /* For both of the coordinates, if the value of -moz-transform is a + * percentage, it's relative to the size of the frame. Otherwise, if it's + * a distance, it's already computed for us! + */ + const nsStyleDisplay* display = aFrame->StyleDisplay(); + nsRect boundingRect = (aBoundsOverride ? *aBoundsOverride : + nsDisplayTransform::GetFrameBoundsForTransform(aFrame)); + + /* Allows us to access named variables by index. */ + float coords[3]; + const nscoord* dimensions[2] = + {&boundingRect.width, &boundingRect.height}; + + for (uint8_t index = 0; index < 2; ++index) { + /* If the -moz-transform-origin specifies a percentage, take the percentage + * of the size of the box. + */ + const nsStyleCoord &coord = display->mTransformOrigin[index]; + if (coord.GetUnit() == eStyleUnit_Calc) { + const nsStyleCoord::Calc *calc = coord.GetCalcValue(); + coords[index] = + NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) * + calc->mPercent + + NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel); + } else if (coord.GetUnit() == eStyleUnit_Percent) { + coords[index] = + NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) * + coord.GetPercentValue(); + } else { + NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit"); + coords[index] = + NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel); + } + if ((aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) && + coord.GetUnit() != eStyleUnit_Percent) { + // values represent offsets from the origin of the SVG element's + // user space, not the top left of its bounds, so we must adjust for that: + nscoord offset = + (index == 0) ? aFrame->GetPosition().x : aFrame->GetPosition().y; + coords[index] -= NSAppUnitsToFloatPixels(offset, aAppUnitsPerPixel); + } + } + + coords[2] = NSAppUnitsToFloatPixels(display->mTransformOrigin[2].GetCoordValue(), + aAppUnitsPerPixel); + /* Adjust based on the origin of the rectangle. */ + coords[0] += NSAppUnitsToFloatPixels(boundingRect.x, aAppUnitsPerPixel); + coords[1] += NSAppUnitsToFloatPixels(boundingRect.y, aAppUnitsPerPixel); + + return gfxPoint3D(coords[0], coords[1], coords[2]); +} + +/* Returns the delta specified by the -moz-perspective-origin property. + * This is a positive delta, meaning that it indicates the direction to move + * to get from (0, 0) of the frame to the perspective origin. This function is + * called off the main thread. + */ +/* static */ gfxPoint3D +nsDisplayTransform::GetDeltaToPerspectiveOrigin(const nsIFrame* aFrame, + float aAppUnitsPerPixel) +{ + NS_PRECONDITION(aFrame, "Can't get delta for a null frame!"); + NS_PRECONDITION(aFrame->IsTransformed() || aFrame->StyleDisplay()->BackfaceIsHidden(), + "Shouldn't get a delta for an untransformed frame!"); + + if (!aFrame->IsTransformed()) { + return gfxPoint3D(); + } + + /* For both of the coordinates, if the value of -moz-perspective-origin is a + * percentage, it's relative to the size of the frame. Otherwise, if it's + * a distance, it's already computed for us! + */ + + //TODO: Should this be using our bounds or the parent's bounds? + // How do we handle aBoundsOverride in the latter case? + nsIFrame* parent = aFrame->GetParentStyleContextFrame(); + if (!parent) { + return gfxPoint3D(); + } + const nsStyleDisplay* display = parent->StyleDisplay(); + nsRect boundingRect = nsDisplayTransform::GetFrameBoundsForTransform(parent); + + /* Allows us to access named variables by index. */ + gfxPoint3D result; + result.z = 0.0f; + gfxFloat* coords[2] = {&result.x, &result.y}; + const nscoord* dimensions[2] = + {&boundingRect.width, &boundingRect.height}; + + for (uint8_t index = 0; index < 2; ++index) { + /* If the -moz-transform-origin specifies a percentage, take the percentage + * of the size of the box. + */ + const nsStyleCoord &coord = display->mPerspectiveOrigin[index]; + if (coord.GetUnit() == eStyleUnit_Calc) { + const nsStyleCoord::Calc *calc = coord.GetCalcValue(); + *coords[index] = + NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) * + calc->mPercent + + NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel); + } else if (coord.GetUnit() == eStyleUnit_Percent) { + *coords[index] = + NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) * + coord.GetPercentValue(); + } else { + NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit"); + *coords[index] = + NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel); + } + } + + nsPoint parentOffset = aFrame->GetOffsetTo(parent); + gfxPoint3D gfxOffset( + NSAppUnitsToFloatPixels(parentOffset.x, aAppUnitsPerPixel), + NSAppUnitsToFloatPixels(parentOffset.y, aAppUnitsPerPixel), + 0.0f); + + return result - gfxOffset; +} + +nsDisplayTransform::FrameTransformProperties::FrameTransformProperties(const nsIFrame* aFrame, + float aAppUnitsPerPixel, + const nsRect* aBoundsOverride) + : mFrame(aFrame) + , mTransformList(aFrame->StyleDisplay()->mSpecifiedTransform) + , mToTransformOrigin(GetDeltaToTransformOrigin(aFrame, aAppUnitsPerPixel, aBoundsOverride)) + , mToPerspectiveOrigin(GetDeltaToPerspectiveOrigin(aFrame, aAppUnitsPerPixel)) + , mChildPerspective(0) +{ + const nsStyleDisplay* parentDisp = nullptr; + nsStyleContext* parentStyleContext = aFrame->StyleContext()->GetParent(); + if (parentStyleContext) { + parentDisp = parentStyleContext->StyleDisplay(); + } + if (parentDisp && parentDisp->mChildPerspective.GetUnit() == eStyleUnit_Coord) { + mChildPerspective = parentDisp->mChildPerspective.GetCoordValue(); + } +} + +/* Wraps up the -moz-transform matrix in a change-of-basis matrix pair that + * translates from local coordinate space to transform coordinate space, then + * hands it back. + */ +gfx3DMatrix +nsDisplayTransform::GetResultingTransformMatrix(const FrameTransformProperties& aProperties, + const nsPoint& aOrigin, + float aAppUnitsPerPixel, + const nsRect* aBoundsOverride, + nsIFrame** aOutAncestor) +{ + return GetResultingTransformMatrixInternal(aProperties, aOrigin, aAppUnitsPerPixel, + aBoundsOverride, aOutAncestor); +} + +gfx3DMatrix +nsDisplayTransform::GetResultingTransformMatrix(const nsIFrame* aFrame, + const nsPoint& aOrigin, + float aAppUnitsPerPixel, + const nsRect* aBoundsOverride, + nsIFrame** aOutAncestor) +{ + FrameTransformProperties props(aFrame, + aAppUnitsPerPixel, + aBoundsOverride); + + return GetResultingTransformMatrixInternal(props, aOrigin, aAppUnitsPerPixel, + aBoundsOverride, aOutAncestor); +} + +gfx3DMatrix +nsDisplayTransform::GetResultingTransformMatrixInternal(const FrameTransformProperties& aProperties, + const nsPoint& aOrigin, + float aAppUnitsPerPixel, + const nsRect* aBoundsOverride, + nsIFrame** aOutAncestor) +{ + const nsIFrame *frame = aProperties.mFrame; + + if (aOutAncestor) { + *aOutAncestor = nsLayoutUtils::GetCrossDocParentFrame(frame); + } + + /* Account for the -moz-transform-origin property by translating the + * coordinate space to the new origin. + */ + gfxPoint3D newOrigin = + gfxPoint3D(NSAppUnitsToFloatPixels(aOrigin.x, aAppUnitsPerPixel), + NSAppUnitsToFloatPixels(aOrigin.y, aAppUnitsPerPixel), + 0.0f); + + /* Get the underlying transform matrix. This requires us to get the + * bounds of the frame. + */ + nsRect bounds = (aBoundsOverride ? *aBoundsOverride : + nsDisplayTransform::GetFrameBoundsForTransform(frame)); + + /* Get the matrix, then change its basis to factor in the origin. */ + bool dummy; + gfx3DMatrix result; + // Call IsSVGTransformed() regardless of the value of + // disp->mSpecifiedTransform, since we still need any transformFromSVGParent. + mozilla::gfx::Matrix svgTransform, transformFromSVGParent; + bool hasSVGTransforms = + frame && frame->IsSVGTransformed(&svgTransform, &transformFromSVGParent); + /* Transformed frames always have a transform, or are preserving 3d (and might still have perspective!) */ + if (aProperties.mTransformList) { + result = nsStyleTransformMatrix::ReadTransforms(aProperties.mTransformList->mHead, + frame ? frame->StyleContext() : nullptr, + frame ? frame->PresContext() : nullptr, + dummy, bounds, aAppUnitsPerPixel); + } else if (hasSVGTransforms) { + // Correct the translation components for zoom: + float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() / + aAppUnitsPerPixel; + svgTransform._31 *= pixelsPerCSSPx; + svgTransform._32 *= pixelsPerCSSPx; + result = gfx3DMatrix::From2D(ThebesMatrix(svgTransform)); + } + + if (hasSVGTransforms && !transformFromSVGParent.IsIdentity()) { + // Correct the translation components for zoom: + float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() / + aAppUnitsPerPixel; + transformFromSVGParent._31 *= pixelsPerCSSPx; + transformFromSVGParent._32 *= pixelsPerCSSPx; + result = result * gfx3DMatrix::From2D(ThebesMatrix(transformFromSVGParent)); + } + + if (aProperties.mChildPerspective > 0.0) { + gfx3DMatrix perspective; + perspective._34 = + -1.0 / NSAppUnitsToFloatPixels(aProperties.mChildPerspective, aAppUnitsPerPixel); + /* At the point when perspective is applied, we have been translated to the transform origin. + * The translation to the perspective origin is the difference between these values. + */ + result = result * nsLayoutUtils::ChangeMatrixBasis(aProperties.mToPerspectiveOrigin - aProperties.mToTransformOrigin, perspective); + } + + gfxPoint3D rounded(hasSVGTransforms ? newOrigin.x : NS_round(newOrigin.x), + hasSVGTransforms ? newOrigin.y : NS_round(newOrigin.y), + 0); + + if (frame && frame->Preserves3D()) { + // Include the transform set on our parent + NS_ASSERTION(frame->GetParent() && + frame->GetParent()->IsTransformed() && + frame->GetParent()->Preserves3DChildren(), + "Preserve3D mismatch!"); + FrameTransformProperties props(frame->GetParent(), + aAppUnitsPerPixel, + nullptr); + gfx3DMatrix parent = + GetResultingTransformMatrixInternal(props, + aOrigin - frame->GetPosition(), + aAppUnitsPerPixel, nullptr, aOutAncestor); + return nsLayoutUtils::ChangeMatrixBasis(rounded + aProperties.mToTransformOrigin, result) * parent; + } + + return nsLayoutUtils::ChangeMatrixBasis + (rounded + aProperties.mToTransformOrigin, result); +} + +bool +nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) +{ + if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_opacity)) { + return true; + } + + if (nsLayoutUtils::IsAnimationLoggingEnabled()) { + nsCString message; + message.AppendLiteral("Performance warning: Async animation disabled because frame was not marked active for opacity animation"); + CommonElementAnimationData::LogAsyncAnimationFailure(message, + Frame()->GetContent()); + } + return false; +} + +bool +nsDisplayTransform::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) +{ + return ShouldPrerenderTransformedContent(aBuilder, + Frame(), + nsLayoutUtils::IsAnimationLoggingEnabled()); +} + +/* static */ bool +nsDisplayTransform::ShouldPrerenderTransformedContent(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, + bool aLogAnimations) +{ + // Elements whose transform has been modified recently, or which + // have a compositor-animated transform, can be prerendered. An element + // might have only just had its transform animated in which case + // the ActiveLayerManager may not have been notified yet. + if (!ActiveLayerTracker::IsStyleAnimated(aFrame, eCSSProperty_transform) && + (!aFrame->GetContent() || + !nsLayoutUtils::HasAnimationsForCompositor(aFrame->GetContent(), + eCSSProperty_transform))) { + if (aLogAnimations) { + nsCString message; + message.AppendLiteral("Performance warning: Async animation disabled because frame was not marked active for transform animation"); + CommonElementAnimationData::LogAsyncAnimationFailure(message, + aFrame->GetContent()); + } + return false; + } + + nsSize refSize = aBuilder->RootReferenceFrame()->GetSize(); + // Only prerender if the transformed frame's size (in the reference + // frames coordinate space) is <= the reference frame size (~viewport), + // allowing a 1/8th fuzz factor for shadows, borders, etc. + refSize += nsSize(refSize.width / 8, refSize.height / 8); + nsRect frameRect = aFrame->GetVisualOverflowRectRelativeToSelf(); + + frameRect = + nsLayoutUtils::TransformFrameRectToAncestor(aFrame, frameRect, + aBuilder->RootReferenceFrame()); + + if (frameRect.Size() <= refSize) { + return true; + } + + if (aLogAnimations) { + nsCString message; + message.AppendLiteral("Performance warning: Async animation disabled because frame size ("); + message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameRect.width)); + message.AppendLiteral(", "); + message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameRect.height)); + message.AppendLiteral(") is bigger than the viewport ("); + message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.width)); + message.AppendLiteral(", "); + message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.height)); + message.AppendLiteral(")"); + CommonElementAnimationData::LogAsyncAnimationFailure(message, + aFrame->GetContent()); + } + return false; +} + +/* If the matrix is singular, or a hidden backface is shown, the frame won't be visible or hit. */ +static bool IsFrameVisible(nsIFrame* aFrame, const gfx3DMatrix& aMatrix) +{ + if (aMatrix.IsSingular()) { + return false; + } + if (aFrame->StyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN && + aMatrix.IsBackfaceVisible()) { + return false; + } + return true; +} + +const gfx3DMatrix& +nsDisplayTransform::GetTransform() +{ + if (mTransform.IsIdentity()) { + float scale = mFrame->PresContext()->AppUnitsPerDevPixel(); + gfxPoint3D newOrigin = + gfxPoint3D(NSAppUnitsToFloatPixels(mToReferenceFrame.x, scale), + NSAppUnitsToFloatPixels(mToReferenceFrame.y, scale), + 0.0f); + if (mTransformGetter) { + mTransform = mTransformGetter(mFrame, scale); + mTransform = nsLayoutUtils::ChangeMatrixBasis(newOrigin, mTransform); + } else { + mTransform = + GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale); + + /** + * Shift the coorindates to be relative to our reference frame instead of relative to this frame. + * When we have preserve-3d, our reference frame is already guaranteed to be an ancestor of the + * preserve-3d chain, so we only need to do this once. + */ + bool hasSVGTransforms = mFrame->IsSVGTransformed(); + gfxPoint3D rounded(hasSVGTransforms ? newOrigin.x : NS_round(newOrigin.x), + hasSVGTransforms ? newOrigin.y : NS_round(newOrigin.y), + 0); + mTransform.Translate(rounded); + } + } + return mTransform; +} + +bool +nsDisplayTransform::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder) +{ + return ShouldPrerenderTransformedContent(aBuilder, mFrame, false); +} + +already_AddRefed nsDisplayTransform::BuildLayer(nsDisplayListBuilder *aBuilder, + LayerManager *aManager, + const ContainerLayerParameters& aContainerParameters) +{ + const gfx3DMatrix& newTransformMatrix = GetTransform(); + + if (mFrame->StyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN && + newTransformMatrix.IsBackfaceVisible()) { + return nullptr; + } + + uint32_t flags = ShouldPrerenderTransformedContent(aBuilder, mFrame, false) ? + FrameLayerBuilder::CONTAINER_NOT_CLIPPED_BY_ANCESTORS : 0; + nsRefPtr container = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, *mStoredList.GetChildren(), + aContainerParameters, &newTransformMatrix, flags); + + if (!container) { + return nullptr; + } + + // Add the preserve-3d flag for this layer, BuildContainerLayerFor clears all flags, + // so we never need to explicitely unset this flag. + if (mFrame->Preserves3D() || mFrame->Preserves3DChildren()) { + container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_PRESERVE_3D); + } else { + container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_PRESERVE_3D); + } + + nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(container, aBuilder, + this, mFrame, + eCSSProperty_transform); + if (ShouldPrerenderTransformedContent(aBuilder, mFrame, false)) { + container->SetUserData(nsIFrame::LayerIsPrerenderedDataKey(), + /*the value is irrelevant*/nullptr); + container->SetContentFlags(container->GetContentFlags() | Layer::CONTENT_MAY_CHANGE_TRANSFORM); + } else { + container->RemoveUserData(nsIFrame::LayerIsPrerenderedDataKey()); + container->SetContentFlags(container->GetContentFlags() & ~Layer::CONTENT_MAY_CHANGE_TRANSFORM); + } + return container.forget(); +} + +nsDisplayItem::LayerState +nsDisplayTransform::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) { + // If the transform is 3d, or the layer takes part in preserve-3d sorting + // then we *always* want this to be an active layer. + if (!GetTransform().Is2D() || mFrame->Preserves3D()) { + return LAYER_ACTIVE_FORCE; + } + // Here we check if the *post-transform* bounds of this item are big enough + // to justify an active layer. + if (ActiveLayerTracker::IsStyleAnimated(mFrame, eCSSProperty_transform) && + !IsItemTooSmallForActiveLayer(this)) + return LAYER_ACTIVE; + if (mFrame->GetContent()) { + if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(), + eCSSProperty_transform)) { + return LAYER_ACTIVE; + } + } + + const nsStyleDisplay* disp = mFrame->StyleDisplay(); + if ((disp->mWillChangeBitField & NS_STYLE_WILL_CHANGE_TRANSFORM)) { + return LAYER_ACTIVE; + } + + // Expect the child display items to have this frame as their animated + // geometry root (since it will be their reference frame). If they have a + // different animated geometry root, we'll make this an active layer so the + // animation can be accelerated. + return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, + *mStoredList.GetChildren(), Frame()); +} + +bool nsDisplayTransform::ComputeVisibility(nsDisplayListBuilder *aBuilder, + nsRegion *aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) +{ + /* 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 (ShouldPrerenderTransformedContent(aBuilder, mFrame) || + !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 +#endif + +/* HitTest does some fun stuff with matrix transforms to obtain the answer. */ +void nsDisplayTransform::HitTest(nsDisplayListBuilder *aBuilder, + const nsRect& aRect, + HitTestState *aState, + nsTArray *aOutFrames) +{ + /* Here's how this works: + * 1. Get the matrix. If it's singular, abort (clearly we didn't hit + * anything). + * 2. Invert the matrix. + * 3. Use it to transform the rect into the correct space. + * 4. Pass that rect down through to the list's version of HitTest. + */ + // GetTransform always operates in dev pixels. + float factor = mFrame->PresContext()->AppUnitsPerDevPixel(); + gfx3DMatrix matrix = GetTransform(); + + if (!IsFrameVisible(mFrame, matrix)) { + return; + } + + /* We want to go from transformed-space to regular space. + * Thus we have to invert the matrix, which normally does + * the reverse operation (e.g. regular->transformed) + */ + bool snap; + nsRect childBounds = mStoredList.GetBounds(aBuilder, &snap); + gfxRect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor), + NSAppUnitsToFloatPixels(childBounds.y, factor), + NSAppUnitsToFloatPixels(childBounds.width, factor), + NSAppUnitsToFloatPixels(childBounds.height, factor)); + + /* Now, apply the transform and pass it down the channel. */ + nsRect resultingRect; + if (aRect.width == 1 && aRect.height == 1) { + // Magic width/height indicating we're hit testing a point, not a rect + gfxPoint point; + if (!matrix.UntransformPoint(gfxPoint(NSAppUnitsToFloatPixels(aRect.x, factor), + NSAppUnitsToFloatPixels(aRect.y, factor)), + childGfxBounds, + &point)) { + return; + } + + resultingRect = nsRect(NSFloatPixelsToAppUnits(float(point.x), factor), + NSFloatPixelsToAppUnits(float(point.y), factor), + 1, 1); + + } else { + gfxRect originalRect(NSAppUnitsToFloatPixels(aRect.x, factor), + NSAppUnitsToFloatPixels(aRect.y, factor), + NSAppUnitsToFloatPixels(aRect.width, factor), + NSAppUnitsToFloatPixels(aRect.height, factor)); + + gfxRect rect = matrix.UntransformBounds(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(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(clock()), + dynamic_cast(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(); + gfx3DMatrix matrix = GetTransform(); + + NS_ASSERTION(IsFrameVisible(mFrame, matrix), "We can't have hit a frame that isn't visible!"); + + bool snap; + nsRect childBounds = mStoredList.GetBounds(aBuilder, &snap); + gfxRect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor), + NSAppUnitsToFloatPixels(childBounds.y, factor), + NSAppUnitsToFloatPixels(childBounds.width, factor), + NSAppUnitsToFloatPixels(childBounds.height, factor)); + + gfxPoint point; + DebugOnly result = matrix.UntransformPoint(gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, factor), + NSAppUnitsToFloatPixels(aPoint.y, factor)), + childGfxBounds, + &point); + NS_ASSERTION(result, "Why are we trying to get the depth for a point we didn't hit?"); + + gfxPoint3D transformed = matrix.Transform3D(gfxPoint3D(point.x, point.y, 0)); + return transformed.z; +} + +/* The bounding rectangle for the object is the overflow rectangle translated + * by the reference point. + */ +nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder *aBuilder, bool* aSnap) +{ + nsRect untransformedBounds = + ShouldPrerenderTransformedContent(aBuilder, mFrame) ? + mFrame->GetVisualOverflowRectRelativeToSelf() : + mStoredList.GetBounds(aBuilder, aSnap); + *aSnap = false; + // GetTransform always operates in dev pixels. + float factor = mFrame->PresContext()->AppUnitsPerDevPixel(); + return nsLayoutUtils::MatrixTransformRect(untransformedBounds, + GetTransform(), + factor); +} + +/* The transform is opaque iff the transform consists solely of scales and + * translations and if the underlying content is opaque. Thus if the transform + * is of the form + * + * |a c e| + * |b d f| + * |0 0 1| + * + * We need b and c to be zero. + * + * We also need to check whether the underlying opaque content completely fills + * our visible rect. We use UntransformRect which expands to the axis-aligned + * bounding rect, but that's OK since if + * mStoredList.GetVisibleRect().Contains(untransformedVisible), then it + * certainly contains the actual (non-axis-aligned) untransformed rect. + */ +nsRegion nsDisplayTransform::GetOpaqueRegion(nsDisplayListBuilder *aBuilder, + bool* aSnap) +{ + *aSnap = false; + nsRect untransformedVisible; + // If we're going to prerender all our content, pretend like we + // don't have opqaue content so that everything under us is rendered + // as well. That will increase graphics memory usage if our frame + // covers the entire window, but it allows our transform to be + // updated extremely cheaply, without invalidating any other + // content. + if (ShouldPrerenderTransformedContent(aBuilder, mFrame) || + !UntransformVisibleRect(aBuilder, &untransformedVisible)) { + return nsRegion(); + } + + const gfx3DMatrix& matrix = GetTransform(); + + nsRegion result; + gfxMatrix matrix2d; + bool tmpSnap; + if (matrix.Is2D(&matrix2d) && + matrix2d.PreservesAxisAlignedRectangles() && + mStoredList.GetOpaqueRegion(aBuilder, &tmpSnap).Contains(untransformedVisible)) { + result = mVisibleRect; + } + 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 gfx3DMatrix& matrix = GetTransform(); + + gfxMatrix matrix2d; + return matrix.Is2D(&matrix2d) && + matrix2d.PreservesAxisAlignedRectangles() && + mStoredList.GetVisibleRect().Contains(untransformedVisible) && + mStoredList.IsUniform(aBuilder, aColor); +} + +/* If UNIFIED_CONTINUATIONS is defined, we can merge two display lists that + * share the same underlying content. Otherwise, doing so results in graphical + * glitches. + */ +#ifndef UNIFIED_CONTINUATIONS + +bool +nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder, + nsDisplayItem *aItem) +{ + return false; +} + +#else + +bool +nsDisplayTransform::TryMerge(nsDisplayListBuilder *aBuilder, + nsDisplayItem *aItem) +{ + NS_PRECONDITION(aItem, "Why did you try merging with a null item?"); + NS_PRECONDITION(aBuilder, "Why did you try merging with a null builder?"); + + /* Make sure that we're dealing with two transforms. */ + if (aItem->GetType() != TYPE_TRANSFORM) + return false; + + /* Check to see that both frames are part of the same content. */ + if (aItem->Frame()->GetContent() != mFrame->GetContent()) + return false; + + if (aItem->GetClip() != GetClip()) + return false; + + /* Now, move everything over to this frame and signal that + * we merged things! + */ + mStoredList.MergeFrom(&static_cast(aItem)->mStoredList); + return true; +} + +#endif + +/* TransformRect takes in as parameters a rectangle (in app space) and returns + * the smallest rectangle (in app space) containing the transformed image of + * that rectangle. That is, it takes the four corners of the rectangle, + * transforms them according to the matrix associated with the specified frame, + * then returns the smallest rectangle containing the four transformed points. + * + * @param aUntransformedBounds The rectangle (in app units) to transform. + * @param aFrame The frame whose transformation should be applied. + * @param aOrigin The delta from the frame origin to the coordinate space origin + * @param aBoundsOverride (optional) Force the frame bounds to be the + * specified bounds. + * @return The smallest rectangle containing the image of the transformed + * rectangle. + */ +nsRect nsDisplayTransform::TransformRect(const nsRect &aUntransformedBounds, + const nsIFrame* aFrame, + const nsPoint &aOrigin, + const nsRect* aBoundsOverride) +{ + NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!"); + + float factor = aFrame->PresContext()->AppUnitsPerDevPixel(); + return nsLayoutUtils::MatrixTransformRect + (aUntransformedBounds, + GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride), + factor); +} + +nsRect nsDisplayTransform::TransformRectOut(const nsRect &aUntransformedBounds, + const nsIFrame* aFrame, + const nsPoint &aOrigin, + const nsRect* aBoundsOverride) +{ + NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!"); + + float factor = aFrame->PresContext()->AppUnitsPerDevPixel(); + return nsLayoutUtils::MatrixTransformRectOut + (aUntransformedBounds, + GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride), + factor); +} + +bool nsDisplayTransform::UntransformRect(const nsRect &aTransformedBounds, + const nsRect &aChildBounds, + const nsIFrame* aFrame, + const nsPoint &aOrigin, + nsRect *aOutRect) +{ + NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!"); + + float factor = aFrame->PresContext()->AppUnitsPerDevPixel(); + + gfx3DMatrix transform = GetResultingTransformMatrix(aFrame, aOrigin, factor, nullptr); + if (transform.IsSingular()) { + return false; + } + + gfxRect result(NSAppUnitsToFloatPixels(aTransformedBounds.x, factor), + NSAppUnitsToFloatPixels(aTransformedBounds.y, factor), + NSAppUnitsToFloatPixels(aTransformedBounds.width, factor), + NSAppUnitsToFloatPixels(aTransformedBounds.height, factor)); + + gfxRect childGfxBounds(NSAppUnitsToFloatPixels(aChildBounds.x, factor), + NSAppUnitsToFloatPixels(aChildBounds.y, factor), + NSAppUnitsToFloatPixels(aChildBounds.width, factor), + NSAppUnitsToFloatPixels(aChildBounds.height, factor)); + + result = transform.UntransformBounds(result, childGfxBounds); + *aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(result, factor); + return true; +} + +bool nsDisplayTransform::UntransformVisibleRect(nsDisplayListBuilder* aBuilder, + nsRect *aOutRect) +{ + const gfx3DMatrix& matrix = GetTransform(); + if (matrix.IsSingular()) + return false; + + // GetTransform always operates in dev pixels. + float factor = mFrame->PresContext()->AppUnitsPerDevPixel(); + gfxRect 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); + gfxRect 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.UntransformBounds(result, childGfxBounds); + + *aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(result, factor); + + return true; +} + +nsDisplaySVGEffects::nsDisplaySVGEffects(nsDisplayListBuilder* aBuilder, + nsIFrame* aFrame, nsDisplayList* aList) + : nsDisplayWrapList(aBuilder, aFrame, aList), + mEffectsBounds(aFrame->GetVisualOverflowRectRelativeToSelf()) +{ + MOZ_COUNT_CTOR(nsDisplaySVGEffects); +} + +#ifdef NS_BUILD_REFCNT_LOGGING +nsDisplaySVGEffects::~nsDisplaySVGEffects() +{ + MOZ_COUNT_DTOR(nsDisplaySVGEffects); +} +#endif + +nsRegion nsDisplaySVGEffects::GetOpaqueRegion(nsDisplayListBuilder* aBuilder, + bool* aSnap) +{ + *aSnap = false; + return nsRegion(); +} + +void +nsDisplaySVGEffects::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect, + HitTestState* aState, nsTArray *aOutFrames) +{ + nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2); + if (nsSVGIntegrationUtils::HitTestFrameForEffects(mFrame, + rectCenter - ToReferenceFrame())) { + mList.HitTest(aBuilder, aRect, aState, aOutFrames); + } +} + +void +nsDisplaySVGEffects::PaintAsLayer(nsDisplayListBuilder* aBuilder, + nsRenderingContext* aCtx, + LayerManager* aManager) +{ + nsSVGIntegrationUtils::PaintFramesWithEffects(aCtx, mFrame, + mVisibleRect, + aBuilder, aManager); +} + +LayerState +nsDisplaySVGEffects::GetLayerState(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aParameters) +{ + return LAYER_SVG_EFFECTS; +} + +already_AddRefed +nsDisplaySVGEffects::BuildLayer(nsDisplayListBuilder* aBuilder, + LayerManager* aManager, + const ContainerLayerParameters& aContainerParameters) +{ + const nsIContent* content = mFrame->GetContent(); + bool hasSVGLayout = (mFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT); + if (hasSVGLayout) { + nsISVGChildFrame *svgChildFrame = do_QueryFrame(mFrame); + if (!svgChildFrame || !mFrame->GetContent()->IsSVG()) { + NS_ASSERTION(false, "why?"); + return nullptr; + } + if (!static_cast(content)->HasValidDimensions()) { + return nullptr; // The SVG spec says not to draw filters for this + } + } + + float opacity = mFrame->StyleDisplay()->mOpacity; + if (opacity == 0.0f) + return nullptr; + + nsIFrame* firstFrame = + nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame); + nsSVGEffects::EffectProperties effectProperties = + nsSVGEffects::GetEffectProperties(firstFrame); + + bool isOK = effectProperties.HasNoFilterOrHasValidFilter(); + effectProperties.GetClipPathFrame(&isOK); + effectProperties.GetMaskFrame(&isOK); + + if (!isOK) { + return nullptr; + } + + ContainerLayerParameters newContainerParameters = aContainerParameters; + if (effectProperties.HasValidFilter()) { + newContainerParameters.mDisableSubpixelAntialiasingInDescendants = true; + } + + nsRefPtr container = aManager->GetLayerBuilder()-> + BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList, + newContainerParameters, nullptr); + + return container.forget(); +} + +bool nsDisplaySVGEffects::ComputeVisibility(nsDisplayListBuilder* aBuilder, + nsRegion* aVisibleRegion, + const nsRect& aAllowVisibleRegionExpansion) { + 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, nsRect()); + return true; +} + +bool nsDisplaySVGEffects::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) +{ + if (aItem->GetType() != TYPE_SVG_EFFECTS) + return false; + // items for the same content element should be merged into a single + // compositing group + // aItem->GetUnderlyingFrame() returns non-null because it's nsDisplaySVGEffects + if (aItem->Frame()->GetContent() != mFrame->GetContent()) + return false; + if (aItem->GetClip() != GetClip()) + return false; + nsDisplaySVGEffects* other = static_cast(aItem); + MergeFromTrackingMergedFrames(other); + mEffectsBounds.UnionRect(mEffectsBounds, + other->mEffectsBounds + other->mFrame->GetOffsetTo(mFrame)); + return true; +} + +#ifdef MOZ_DUMP_PAINTING +void +nsDisplaySVGEffects::PrintEffects(nsACString& aTo) +{ + nsIFrame* firstFrame = + nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame); + nsSVGEffects::EffectProperties effectProperties = + nsSVGEffects::GetEffectProperties(firstFrame); + bool isOK = true; + nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame(&isOK); + bool first = true; + aTo += " effects=("; + if (mFrame->StyleDisplay()->mOpacity != 1.0f) { + first = false; + aTo += nsPrintfCString("opacity(%f)", mFrame->StyleDisplay()->mOpacity); + } + if (clipPathFrame) { + if (!first) { + aTo += ", "; + } + aTo += nsPrintfCString("clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial"); + first = false; + } + if (effectProperties.HasValidFilter()) { + if (!first) { + aTo += ", "; + } + aTo += "filter"; + first = false; + } + if (effectProperties.GetMaskFrame(&isOK)) { + if (!first) { + aTo += ", "; + } + aTo += "mask"; + } + aTo += ")"; +} +#endif +