gecko/layout/base/nsDisplayList.cpp

4539 lines
162 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
/*
* structures that represent things to be painted (ordered in z-order),
* used during painting and hit testing
*/
// include PBrowserChild explicitly because TabChild won't include it
// because we're in layout :(
#include "mozilla/dom/PBrowserChild.h"
#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 "nsFrameManager.h"
#include "gfxContext.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "gfxMatrix.h"
#include "nsSVGIntegrationUtils.h"
#include "nsLayoutUtils.h"
#include "nsIScrollableFrame.h"
#include "nsThemeConstants.h"
#include "LayerTreeInvalidation.h"
#include "imgIContainer.h"
#include "nsIInterfaceRequestorUtils.h"
#include "BasicLayers.h"
#include "nsBoxFrame.h"
#include "nsViewportFrame.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 "mozilla/StandardInteger.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::layers;
using namespace mozilla::dom;
typedef FrameMetrics::ViewID ViewID;
static void AddTransformFunctions(nsCSSValueList* aList,
nsStyleContext* aContext,
nsPresContext* aPresContext,
nsRect& aBounds,
float aAppUnitsPerPixel,
InfallibleTArray<TransformFunction>& aFunctions)
{
if (aList->mValue.GetUnit() == eCSSUnit_None) {
return;
}
for (const nsCSSValueList* curr = aList; curr; curr = curr->mNext) {
const nsCSSValue& currElem = curr->mValue;
NS_ASSERTION(currElem.GetUnit() == eCSSUnit_Function,
"Stream should consist solely of functions!");
nsCSSValue::Array* array = currElem.GetArrayValue();
bool canStoreInRuleTree = true;
switch (nsStyleTransformMatrix::TransformFunctionOf(array)) {
case eCSSKeyword_rotatex:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationX(theta));
break;
}
case eCSSKeyword_rotatey:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationY(theta));
break;
}
case eCSSKeyword_rotatez:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(RotationZ(theta));
break;
}
case eCSSKeyword_rotate:
{
double theta = array->Item(1).GetAngleValueInRadians();
aFunctions.AppendElement(Rotation(theta));
break;
}
case eCSSKeyword_rotate3d:
{
double x = array->Item(1).GetFloatValue();
double y = array->Item(2).GetFloatValue();
double z = array->Item(3).GetFloatValue();
double theta = array->Item(4).GetAngleValueInRadians();
aFunctions.AppendElement(Rotation3D(x, y, z, theta));
break;
}
case eCSSKeyword_scalex:
{
double x = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(x, 1, 1));
break;
}
case eCSSKeyword_scaley:
{
double y = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(1, y, 1));
break;
}
case eCSSKeyword_scalez:
{
double z = array->Item(1).GetFloatValue();
aFunctions.AppendElement(Scale(1, 1, z));
break;
}
case eCSSKeyword_scale:
{
double x = array->Item(1).GetFloatValue();
// scale(x) is shorthand for scale(x, x);
double y = array->Count() == 2 ? x : array->Item(2).GetFloatValue();
aFunctions.AppendElement(Scale(x, y, 1));
break;
}
case eCSSKeyword_scale3d:
{
double x = array->Item(1).GetFloatValue();
double y = array->Item(2).GetFloatValue();
double z = array->Item(3).GetFloatValue();
aFunctions.AppendElement(Scale(x, y, z));
break;
}
case eCSSKeyword_translatex:
{
double x = nsStyleTransformMatrix::ProcessTranslatePart(
array->Item(1), aContext, aPresContext, canStoreInRuleTree,
aBounds.Width(), 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:
{
gfx3DMatrix 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:
{
gfx3DMatrix 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);
aFunctions.AppendElement(TransformMatrix(matrix));
break;
}
case eCSSKeyword_perspective:
{
aFunctions.AppendElement(Perspective(array->Item(1).GetFloatValue()));
break;
}
default:
NS_ERROR("Function not handled yet!");
}
}
}
static TimingFunction
ToTimingFunction(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
AddAnimationsForProperty(nsIFrame* aFrame, nsCSSProperty aProperty,
ElementAnimation* ea, Layer* aLayer,
AnimationData& aData)
{
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();
TimeStamp startTime = ea->mStartTime + ea->mDelay;
TimeDuration duration = ea->mIterationDuration;
float iterations = ea->mIterationCount != NS_IEEEPositiveInfinity()
? ea->mIterationCount : -1;
int direction = ea->mDirection;
Animation* animation = aLayer->AddAnimation(startTime, duration,
iterations, direction,
aProperty, 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<TransformFunction>();
animSegment->endState() = InfallibleTArray<TransformFunction>();
nsCSSValueList* list = segment->mFromValue.GetCSSValueListValue();
AddTransformFunctions(list, styleContext, presContext, bounds, scale,
animSegment->startState().get_ArrayOfTransformFunction());
list = segment->mToValue.GetCSSValueListValue();
AddTransformFunctions(list, 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);
}
}
}
static void
AddAnimationsAndTransitionsToLayer(Layer* aLayer, nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem, nsCSSProperty aProperty)
{
aLayer->ClearAnimations();
nsIFrame* frame = aItem->Frame();
nsIContent* content = frame->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. Layout will still perform the
// animation.
if (!aItem->CanUseAsyncAnimations(aBuilder)) {
return;
}
mozilla::TimeStamp currentTime =
frame->PresContext()->RefreshDriver()->MostRecentRefresh();
AnimationData data;
if (aProperty == eCSSProperty_transform) {
nsRect bounds = nsDisplayTransform::GetFrameBoundsForTransform(frame);
// all data passed directly to the compositor should be in css pixels
float scale = nsDeviceContext::AppUnitsPerCSSPixel();
gfxPoint3D offsetToTransformOrigin =
nsDisplayTransform::GetDeltaToMozTransformOrigin(frame, scale, &bounds);
gfxPoint3D offsetToPerspectiveOrigin =
nsDisplayTransform::GetDeltaToMozPerspectiveOrigin(frame, scale);
nscoord perspective = 0.0;
nsStyleContext* parentStyleContext = frame->StyleContext()->GetParent();
if (parentStyleContext) {
const nsStyleDisplay* disp = parentStyleContext->StyleDisplay();
if (disp && disp->mChildPerspective.GetUnit() == eStyleUnit_Coord) {
perspective = disp->mChildPerspective.GetCoordValue();
}
}
nsPoint origin = aItem->ToReferenceFrame();
data = TransformData(origin, offsetToTransformOrigin,
offsetToPerspectiveOrigin, bounds, perspective,
frame->PresContext()->AppUnitsPerDevPixel());
} else if (aProperty == eCSSProperty_opacity) {
data = null_t();
}
if (et) {
for (uint32_t tranIdx = 0; tranIdx < et->mPropertyTransitions.Length(); tranIdx++) {
ElementPropertyTransition* pt = &et->mPropertyTransitions[tranIdx];
if (pt->mProperty != aProperty || !pt->IsRunningAt(currentTime)) {
continue;
}
ElementAnimation anim;
anim.mIterationCount = 1;
anim.mDirection = NS_STYLE_ANIMATION_DIRECTION_NORMAL;
anim.mFillMode = NS_STYLE_ANIMATION_FILL_MODE_NONE;
// Transition mStartTime is end-of-delay; animation mStartTime
// is start-of-delay, so set delay here to 0.
anim.mStartTime = pt->mStartTime;
anim.mDelay = TimeDuration::FromMilliseconds(0);
anim.mIterationDuration = pt->mDuration;
AnimationProperty& prop = *anim.mProperties.AppendElement();
prop.mProperty = pt->mProperty;
AnimationPropertySegment& segment = *prop.mSegments.AppendElement();
segment.mFromKey = 0;
segment.mToKey = 1;
segment.mFromValue = pt->mStartValue;
segment.mToValue = pt->mEndValue;
segment.mTimingFunction = pt->mTimingFunction;
AddAnimationsForProperty(frame, aProperty, &anim,
aLayer, data);
pt->mIsRunningOnCompositor = true;
}
aLayer->SetAnimationGeneration(et->mAnimationGeneration);
}
if (ea) {
for (uint32_t animIdx = 0; animIdx < ea->mAnimations.Length(); animIdx++) {
ElementAnimation* anim = &ea->mAnimations[animIdx];
if (!(anim->HasAnimationOfProperty(aProperty) &&
anim->IsRunningAt(currentTime))) {
continue;
}
AddAnimationsForProperty(frame, aProperty, anim,
aLayer, data);
}
aLayer->SetAnimationGeneration(ea->mAnimationGeneration);
}
}
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
Mode aMode, bool aBuildCaret)
: mReferenceFrame(aReferenceFrame),
mIgnoreScrollFrame(nullptr),
mCurrentTableItem(nullptr),
mFinalTransparentRegion(nullptr),
mCachedOffsetFrame(aReferenceFrame),
mCachedReferenceFrame(aReferenceFrame),
mCachedOffset(0, 0),
mGlassDisplayItem(nullptr),
mMode(aMode),
mBuildCaret(aBuildCaret),
mIgnoreSuppression(false),
mHadToIgnoreSuppression(false),
mIsAtRootOfPseudoStackingContext(false),
mIncludeAllOutOfFlows(false),
mSelectedFramesOnly(false),
mAccurateVisibleRegions(false),
mAllowMergingAndFlattening(true),
mWillComputePluginGeometry(false),
mInTransform(false),
mSyncDecodeImages(false),
mIsPaintingToWindow(false),
mHasDisplayPort(false),
mHasFixedItems(false),
mIsInFixedPosition(false),
mIsCompositingCheap(false),
mContainsPluginItem(false)
{
MOZ_COUNT_CTOR(nsDisplayListBuilder);
PL_InitArenaPool(&mPool, "displayListArena", 1024,
std::max(NS_ALIGNMENT_OF(void*),NS_ALIGNMENT_OF(double))-1);
nsPresContext* pc = aReferenceFrame->PresContext();
nsIPresShell *shell = pc->PresShell();
if (pc->IsRenderingOnlySelection()) {
nsCOMPtr<nsISelectionController> selcon(do_QueryInterface(shell));
if (selcon) {
selcon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mBoundingSelection));
}
}
if(mReferenceFrame->GetType() == nsGkAtoms::viewportFrame) {
ViewportFrame* viewportFrame = static_cast<ViewportFrame*>(mReferenceFrame);
if (!viewportFrame->GetChildList(nsIFrame::kFixedList).IsEmpty()) {
mHasFixedItems = true;
}
}
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;
}
}
}
static bool IsFixedFrame(nsIFrame* aFrame)
{
return aFrame && aFrame->GetParent() && !aFrame->GetParent()->GetParent();
}
bool
nsDisplayListBuilder::IsFixedItem(nsDisplayItem *aItem,
const nsIFrame** aActiveScrolledRoot,
const nsIFrame* aOverrideActiveScrolledRoot)
{
const nsIFrame* activeScrolledRoot = aOverrideActiveScrolledRoot;
if (!activeScrolledRoot) {
if (aItem->GetType() == nsDisplayItem::TYPE_SCROLL_LAYER) {
nsDisplayScrollLayer* scrollLayerItem =
static_cast<nsDisplayScrollLayer*>(aItem);
activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(scrollLayerItem->GetScrolledFrame(),
FindReferenceFrameFor(scrollLayerItem->GetScrolledFrame()));
} else {
activeScrolledRoot = nsLayoutUtils::GetActiveScrolledRootFor(aItem, this);
}
}
if (aActiveScrolledRoot) {
*aActiveScrolledRoot = activeScrolledRoot;
}
return activeScrolledRoot &&
!nsLayoutUtils::IsScrolledByRootContentDocumentDisplayportScrolling(activeScrolledRoot, this);
}
static bool ForceVisiblityForFixedItem(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
return aBuilder->GetDisplayPort() && aBuilder->GetHasFixedItems() &&
aBuilder->IsFixedItem(aItem);
}
void nsDisplayListBuilder::SetDisplayPort(const nsRect& aDisplayPort)
{
mHasDisplayPort = true;
mDisplayPort = aDisplayPort;
}
void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame,
nsIFrame* aFrame,
const nsRect& aDirtyRect)
{
nsRect dirty = aDirtyRect - 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 (mHasDisplayPort && IsFixedFrame(aFrame)) {
dirty = overflowRect;
}
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 void RecordFrameMetrics(nsIFrame* aForFrame,
nsIFrame* aScrollFrame,
ContainerLayer* aRoot,
const nsRect& aVisibleRect,
const nsRect& aViewport,
nsRect* aDisplayPort,
nsRect* aCriticalDisplayPort,
ViewID aScrollId,
const nsDisplayItem::ContainerParameters& aContainerParameters,
bool aMayHaveTouchListeners) {
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();
if (scrollableFrame) {
nsRect contentBounds = scrollableFrame->GetScrollRange();
contentBounds.width += scrollableFrame->GetScrollPortRect().width;
contentBounds.height += scrollableFrame->GetScrollPortRect().height;
metrics.mScrollableRect = CSSRect::FromAppUnits(contentBounds);
nsPoint scrollPosition = scrollableFrame->GetScrollPosition();
metrics.mScrollOffset = CSSPoint::FromAppUnits(scrollPosition);
}
else {
nsRect contentBounds = aForFrame->GetRect();
metrics.mScrollableRect = CSSRect::FromAppUnits(contentBounds);
}
metrics.mScrollId = aScrollId;
nsIPresShell* presShell = presContext->GetPresShell();
if (TabChild *tc = GetTabChildFrom(presShell)) {
metrics.mZoom = tc->GetZoom();
}
metrics.mResolution = LayoutDeviceToLayerScale(presShell->GetXResolution(),
presShell->GetYResolution());
metrics.mDevPixelsPerCSSPixel = CSSToLayoutDeviceScale(
(float)nsPresContext::AppUnitsPerCSSPixel() / auPerDevPixel);
metrics.mMayHaveTouchListeners = aMayHaveTouchListeners;
if (nsIWidget* widget = aForFrame->GetNearestWidget()) {
nsIntRect bounds;
widget->GetBounds(bounds);
metrics.mCompositionBounds = ScreenIntRect::FromUnknownRect(
mozilla::gfx::IntRect(bounds.x, bounds.y, bounds.width, bounds.height));
}
metrics.mPresShellId = presShell->GetPresShellId();
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;
}
static uint64_t RegionArea(const nsRegion& aRegion)
{
uint64_t area = 0;
nsRegionRectIterator iter(aRegion);
const nsRect* r;
while ((r = iter.Next()) != nullptr) {
area += uint64_t(r->width)*r->height;
}
return area;
}
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 ||
RegionArea(tmp) <= RegionArea(*aVisibleRegion)/2) {
*aVisibleRegion = tmp;
}
}
nsCaret *
nsDisplayListBuilder::GetCaret() {
nsRefPtr<nsCaret> 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<nsCaret> 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) {
for (nsFrameList::Enumerator e(aFrames); !e.AtEnd(); e.Next()) {
mFramesMarkedForDisplay.AppendElement(e.get());
MarkOutOfFlowFrameForDisplay(aDirtyFrame, e.get(), aDirtyRect);
}
}
void
nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(nsIFrame* aDirtyFrame, const nsRect& aDirtyRect)
{
nsAutoTArray<nsIFrame::ChildList,4> childListArray;
aDirtyFrame->GetChildLists(&childListArray);
nsIFrame::ChildListArrayIterator lists(childListArray);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame *child = childFrames.get();
if (child->Preserves3D()) {
mFramesMarkedForDisplay.AppendElement(child);
nsRect dirty = aDirtyRect - child->GetOffsetTo(aDirtyFrame);
child->Properties().Set(nsDisplayListBuilder::Preserve3DDirtyRectProperty(),
new nsRect(dirty));
MarkFrameForDisplay(child, aDirtyFrame);
}
}
}
}
void*
nsDisplayListBuilder::Allocate(size_t aSize) {
void *tmp;
PL_ARENA_ALLOCATE(tmp, &mPool, aSize);
if (!tmp) {
NS_RUNTIMEABORT("out of memory");
}
return tmp;
}
const DisplayItemClip*
nsDisplayListBuilder::AllocateDisplayItemClip(const DisplayItemClip& aOriginal)
{
void* p = Allocate(sizeof(DisplayItemClip));
if (!aOriginal.GetRoundedRectCount()) {
memcpy(p, &aOriginal, sizeof(DisplayItemClip));
return static_cast<DisplayItemClip*>(p);
}
DisplayItemClip* c = new (p) DisplayItemClip(aOriginal);
mDisplayItemClipsToDestroy.AppendElement(c);
return c;
}
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<nsDisplayItem*>* 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) {
PROFILER_LABEL("nsDisplayList", "ComputeVisibilityForRoot");
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
return ComputeVisibilityForSublist(aBuilder, aVisibleRegion,
r.GetBounds(), r.GetBounds());
}
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;
}
static nsRect
GetDisplayPortBounds(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem)
{
// GetDisplayPortBounds() rectangle is used in order to restrict fixed aItem's
// visible bounds. nsDisplayTransform bounds already take item's
// transform into account, so there is no need to apply it here one more time.
// Start TransformRectToBoundsInAncestor() calculations from aItem's frame
// parent in this case.
nsIFrame* frame = aItem->Frame();
if (aItem->GetType() == nsDisplayItem::TYPE_TRANSFORM) {
frame = nsLayoutUtils::GetCrossDocParentFrame(frame);
}
const nsRect* displayport = aBuilder->GetDisplayPort();
nsRect result = nsLayoutUtils::TransformAncestorRectToFrame(
frame,
nsRect(0, 0, displayport->width, displayport->height),
aBuilder->FindReferenceFrameFor(frame));
result.MoveBy(aBuilder->ToReferenceFrame(frame));
return result;
}
bool
nsDisplayList::ComputeVisibilityForSublist(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aListVisibleBounds,
const nsRect& aAllowVisibleRegionExpansion) {
#ifdef DEBUG
nsRegion r;
r.And(*aVisibleRegion, GetBounds(aBuilder));
NS_ASSERTION(r.GetBounds().IsEqualInterior(aListVisibleBounds),
"bad aListVisibleBounds");
#endif
mVisibleRect = aListVisibleBounds;
bool anyVisible = false;
nsAutoTArray<nsDisplayItem*, 512> 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 (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;
if (ForceVisiblityForFixedItem(aBuilder, item)) {
itemVisible.And(GetDisplayPortBounds(aBuilder, item), bounds);
} else {
itemVisible.And(*aVisibleRegion, bounds);
}
item->mVisibleRect = itemVisible.GetBounds();
if (item->ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion.Intersect(bounds))) {
anyVisible = true;
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;
#ifdef DEBUG
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> 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_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()) &&
widgetTransaction;
nsAutoPtr<LayerProperties> props(computeInvalidRect ?
LayerProperties::CloneFrom(layerManager->GetRoot()) :
nullptr);
nsDisplayItem::ContainerParameters containerParameters
(presShell->GetXResolution(), presShell->GetYResolution());
nsRefPtr<ContainerLayer> root = layerBuilder->
BuildContainerLayerFor(aBuilder, layerManager, aForFrame, nullptr, *this,
containerParameters, nullptr);
if (widgetTransaction) {
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 = presContext->IsRootContentDocument() ? FrameMetrics::ROOT_SCROLL_ID
: FrameMetrics::NULL_SCROLL_ID;
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);
}
}
bool mayHaveTouchListeners = false;
if (presShell) {
nsIDocument* document = presShell->GetDocument();
if (document) {
nsCOMPtr<nsPIDOMWindow> innerWin(document->GetInnerWindow());
if (innerWin) {
mayHaveTouchListeners = innerWin->HasTouchEventListeners();
}
}
}
nsRect viewport(aBuilder->ToReferenceFrame(aForFrame), aForFrame->GetSize());
RecordFrameMetrics(aForFrame, rootScrollFrame,
root, mVisibleRect, viewport,
(usingDisplayport ? &displayport : nullptr),
(usingCriticalDisplayport ? &criticalDisplayport : nullptr),
id, containerParameters, mayHaveTouchListeners);
if (usingDisplayport &&
!(root->GetContentFlags() & Layer::CONTENT_OPAQUE)) {
// See bug 693938, attachment 567017
NS_WARNING("We don't support transparent content with displayports, force it to be opqaue");
root->SetContentFlags(Layer::CONTENT_OPAQUE);
}
layerManager->SetRoot(root);
layerBuilder->WillEndTransaction();
bool temp = aBuilder->SetIsCompositingCheap(layerManager->IsCompositingCheap());
layerManager->EndTransaction(FrameLayerBuilder::DrawThebesLayer,
aBuilder, (aFlags & PAINT_NO_COMPOSITE) ? LayerManager::END_NO_COMPOSITE : LayerManager::END_DEFAULT);
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;
}
// 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<nsIFrame*> mFrames;
};
// Sort the frames by depth and then moves all the contained frames to the destination
void FlushFramesArray(nsTArray<FramesWithDepth>& aSource, nsTArray<nsIFrame*>* aDest)
{
if (aSource.IsEmpty()) {
return;
}
aSource.Sort();
uint32_t length = aSource.Length();
for (uint32_t i = 0; i < length; i++) {
aDest->MoveElementsFrom(aSource[i].mFrames);
}
aSource.Clear();
}
void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames) const {
int32_t itemBufferStart = aState->mItemBuffer.Length();
nsDisplayItem* item;
for (item = GetBottom(); item; item = item->GetAbove()) {
aState->mItemBuffer.AppendElement(item);
}
nsAutoTArray<FramesWithDepth, 16> temp;
for (int32_t i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart; --i) {
// Pop element off the end of the buffer. We want to shorten the buffer
// so that recursive calls to HitTest have more buffer space.
item = aState->mItemBuffer[i];
aState->mItemBuffer.SetLength(i);
bool snap;
nsRect r = item->GetBounds(aBuilder, &snap).Intersect(aRect);
if (item->GetClip().MayIntersect(r)) {
nsAutoTArray<nsIFrame*, 16> outFrames;
item->HitTest(aBuilder, aRect, aState, &outFrames);
// For 3d transforms with preserve-3d we add hit frames into the temp list
// so we can sort them later, otherwise we add them directly to the output list.
nsTArray<nsIFrame*> *writeFrames = aOutFrames;
if (item->GetType() == nsDisplayItem::TYPE_TRANSFORM &&
item->Frame()->Preserves3D()) {
if (outFrames.Length()) {
nsDisplayTransform *transform = static_cast<nsDisplayTransform*>(item);
nsPoint point = aRect.TopLeft();
// A 1x1 rect means a point, otherwise use the center of the rect
if (aRect.width != 1 || aRect.height != 1) {
point = aRect.Center();
}
temp.AppendElement(FramesWithDepth(transform->GetHitDepthAtPoint(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) &&
f->StyleVisibility()->GetEffectivePointerEvents(f) != NS_STYLE_POINTER_EVENTS_NONE) {
writeFrames->AppendElement(f);
}
}
}
}
// Clear any remaining preserve-3d transforms.
FlushFramesArray(temp, aOutFrames);
NS_ASSERTION(aState->mItemBuffer.Length() == uint32_t(itemBufferStart),
"How did we forget to pop some elements?");
}
static void Sort(nsDisplayList* aList, int32_t aCount, nsDisplayList::SortLEQ aCmp,
void* aClosure) {
if (aCount < 2)
return;
nsDisplayList list1;
nsDisplayList list2;
int i;
int32_t half = aCount/2;
bool sorted = true;
nsDisplayItem* prev = nullptr;
for (i = 0; i < aCount; ++i) {
nsDisplayItem* item = aList->RemoveBottom();
(i < half ? &list1 : &list2)->AppendToTop(item);
if (sorted && prev && !aCmp(prev, item, aClosure)) {
sorted = false;
}
prev = item;
}
if (sorted) {
aList->AppendToTop(&list1);
aList->AppendToTop(&list2);
return;
}
Sort(&list1, half, aCmp, aClosure);
Sort(&list2, aCount - half, aCmp, aClosure);
for (i = 0; i < aCount; ++i) {
if (list1.GetBottom() &&
(!list2.GetBottom() ||
aCmp(list1.GetBottom(), list2.GetBottom(), aClosure))) {
aList->AppendToTop(list1.RemoveBottom());
} else {
aList->AppendToTop(list2.RemoveBottom());
}
}
}
static nsIContent* FindContentInDocument(nsDisplayItem* aItem, nsIDocument* aDoc) {
nsIFrame* f = aItem->Frame();
while (f) {
nsPresContext* pc = f->PresContext();
if (pc->Document() == aDoc) {
return f->GetContent();
}
f = nsLayoutUtils::GetCrossDocParentFrame(pc->PresShell()->GetRootFrame());
}
return nullptr;
}
static bool IsContentLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
nsIContent* commonAncestor = static_cast<nsIContent*>(aClosure);
// It's possible that the nsIContent for aItem1 or aItem2 is in a subdocument
// of commonAncestor, because display items for subdocuments have been
// mixed into the same list. Ensure that we're looking at content
// in commonAncestor's document.
nsIDocument* commonAncestorDoc = commonAncestor->OwnerDoc();
nsIContent* content1 = FindContentInDocument(aItem1, commonAncestorDoc);
nsIContent* content2 = FindContentInDocument(aItem2, commonAncestorDoc);
if (!content1 || !content2) {
NS_ERROR("Document trees are mixed up!");
// Something weird going on
return true;
}
return nsLayoutUtils::CompareTreePosition(content1, content2, commonAncestor) <= 0;
}
static bool IsZOrderLEQ(nsDisplayItem* aItem1, nsDisplayItem* aItem2,
void* aClosure) {
// Note that we can't just take the difference of the two
// z-indices here, because that might overflow a 32-bit int.
int32_t index1 = nsLayoutUtils::GetZIndex(aItem1->Frame());
int32_t index2 = nsLayoutUtils::GetZIndex(aItem2->Frame());
return index1 <= index2;
}
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 sMaxLayersCached;
}
bool
nsDisplayItem::RecomputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion) {
nsRect bounds = GetClippedBounds(aBuilder);
nsRegion itemVisible;
if (ForceVisiblityForFixedItem(aBuilder, this)) {
itemVisible.And(GetDisplayPortBounds(aBuilder, this), bounds);
} else {
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);
}
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)
, mIsBottommostLayer(true)
{
MOZ_COUNT_CTOR(nsDisplayBackgroundImage);
if (mBackgroundStyle) {
// Set HasFixedItems if we construct a background-attachment:fixed item
if (mLayer != mBackgroundStyle->mImageCount - 1) {
mIsBottommostLayer = false;
}
// Check if this background layer is attachment-fixed
if (mBackgroundStyle->mLayers[mLayer].mAttachment == NS_STYLE_BG_ATTACHMENT_FIXED) {
aBuilder->SetHasFixedItems();
}
}
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*/ nsresult
nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList,
bool* aAppendedThemedBackground)
{
if (aAppendedThemedBackground) {
*aAppendedThemedBackground = false;
}
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);
}
// 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()) {
aList->AppendNewToTop(
new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bg,
drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0)));
}
if (isThemed) {
nsDisplayThemedBackground* bgItem =
new (aBuilder) nsDisplayThemedBackground(aBuilder, aFrame);
aList->AppendNewToTop(bgItem);
if (aAppendedThemedBackground) {
*aAppendedThemedBackground = true;
}
return NS_OK;
}
if (!bg) {
return NS_OK;
}
// 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;
}
nsDisplayBackgroundImage* bgItem =
new (aBuilder) nsDisplayBackgroundImage(aBuilder, aFrame, i, bg);
aList->AppendNewToTop(bgItem);
}
return NS_OK;
}
// 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> 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;
}
// Sub-pixel alignment is hard, lets punt on that.
if (state.mAnchor != nsPoint(0.0f, 0.0f)) {
return false;
}
int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
mDestRect = nsLayoutUtils::RectToGfxRect(state.mDestArea, appUnitsPerDevPixel);
mImageContainer = imageContainer;
// Ok, we can turn this into a layer if needed.
return true;
}
already_AddRefed<ImageContainer>
nsDisplayBackgroundImage::GetContainer(LayerManager* aManager,
nsDisplayListBuilder *aBuilder)
{
if (!TryOptimizeToImageLayer(aManager, aBuilder)) {
return nullptr;
}
nsRefPtr<ImageContainer> container = mImageContainer;
return container.forget();
}
LayerState
nsDisplayBackgroundImage::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const FrameLayerBuilder::ContainerParameters& aParameters)
{
bool animated = false;
if (mBackgroundStyle) {
const nsStyleBackground::Layer &layer = mBackgroundStyle->mLayers[mLayer];
const nsStyleImage* image = &layer.mImage;
if (image->GetType() == eStyleImageType_Image) {
imgIRequest* imgreq = image->GetImageData();
nsCOMPtr<imgIContainer> image;
if (NS_SUCCEEDED(imgreq->GetImage(getter_AddRefs(image))) && image) {
if (NS_FAILED(image->GetAnimated(&animated))) {
animated = false;
}
}
}
}
if (!animated ||
!nsLayoutUtils::AnimatedImageLayersEnabled()) {
if (!aManager->IsCompositingCheap() ||
!nsLayoutUtils::GPUImageScalingEnabled()) {
return LAYER_NONE;
}
}
if (!TryOptimizeToImageLayer(aManager, aBuilder)) {
return LAYER_NONE;
}
if (!animated) {
gfxSize imageSize = mImageContainer->GetCurrentSize();
NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!");
gfxRect destRect = mDestRect;
destRect.width *= aParameters.mXScale;
destRect.height *= aParameters.mYScale;
// Calculate the scaling factor for the frame.
gfxSize scale = gfxSize(destRect.width / imageSize.width, destRect.height / imageSize.height);
// If we are not scaling at all, no point in separating this into a layer.
if (scale.width == 1.0f && scale.height == 1.0f) {
return LAYER_NONE;
}
// If the target size is pretty small, no point in using a layer.
if (destRect.width * destRect.height < 64 * 64) {
return LAYER_NONE;
}
}
return LAYER_ACTIVE;
}
already_AddRefed<Layer>
nsDisplayBackgroundImage::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aParameters)
{
nsRefPtr<ImageLayer> layer = static_cast<ImageLayer*>
(aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, this));
if (!layer) {
layer = aManager->CreateImageLayer();
if (!layer)
return nullptr;
}
layer->SetContainer(mImageContainer);
ConfigureLayer(layer, aParameters.mOffset);
return layer.forget();
}
void
nsDisplayBackgroundImage::ConfigureLayer(ImageLayer* aLayer, const nsIntPoint& aOffset)
{
aLayer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(mFrame));
gfxIntSize imageSize = mImageContainer->GetCurrentSize();
NS_ASSERTION(imageSize.width != 0 && imageSize.height != 0, "Invalid image size!");
gfxMatrix transform;
transform.Translate(mDestRect.TopLeft() + aOffset);
transform.Scale(mDestRect.width/imageSize.width,
mDestRect.height/imageSize.height);
aLayer->SetBaseTransform(gfx3DMatrix::From2D(transform));
aLayer->SetVisibleRegion(nsIntRect(0, 0, imageSize.width, imageSize.height));
}
void
nsDisplayBackgroundImage::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
if (RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
bool
nsDisplayBackgroundImage::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
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()) {
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<const nsDisplayBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (positioningArea.TopLeft() != geometry->mPositioningArea.TopLeft() ||
(positioningArea.Size() != geometry->mPositioningArea.Size() &&
RenderingMightDependOnPositioningAreaSizeChange())) {
// Positioning area changed in a way that could cause everything to change,
// so invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (aBuilder->ShouldSyncDecodeImages()) {
if (mBackgroundStyle &&
!nsCSSRendering::IsBackgroundImageDecodedForStyleContextAndLayer(mBackgroundStyle, mLayer)) {
aInvalidRegion->Or(*aInvalidRegion, bounds);
}
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
}
}
nsRect
nsDisplayBackgroundImage::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = true;
return mBounds;
}
nsRect
nsDisplayBackgroundImage::GetBoundsInternal(nsDisplayListBuilder* aBuilder) {
nsPresContext* presContext = mFrame->PresContext();
if (!mBackgroundStyle) {
return nsRect();
}
nsRect borderBox = nsRect(ToReferenceFrame(), mFrame->GetSize());
nsRect clipRect = borderBox;
if (mFrame->GetType() == nsGkAtoms::canvasFrame) {
nsCanvasFrame* frame = static_cast<nsCanvasFrame*>(mFrame);
clipRect = frame->CanvasArea() + ToReferenceFrame();
}
const nsStyleBackground::Layer& layer = mBackgroundStyle->mLayers[mLayer];
return nsCSSRendering::GetBackgroundLayerRect(presContext, mFrame,
borderBox, clipRect,
*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
if (mAppearance == NS_THEME_MOZ_MAC_UNIFIED_TOOLBAR ||
mAppearance == NS_THEME_TOOLBAR ||
mAppearance == NS_THEME_WINDOW_TITLEBAR) {
RegisterThemeGeometry(aBuilder, aFrame);
} else if (mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
mAppearance == NS_THEME_WIN_GLASS) {
aBuilder->SetGlassDisplayItem(this);
}
mBounds = GetBoundsInternal();
}
nsDisplayThemedBackground::~nsDisplayThemedBackground()
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_DTOR(nsDisplayThemedBackground);
#endif
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplayThemedBackground::WriteDebugInfo(FILE *aOutput)
{
fprintf(aOutput, "(themed, appearance:%d) ", mAppearance);
}
#endif
void
nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*> *aOutFrames)
{
// Assume that any point in our border rect is a hit.
if (nsRect(ToReferenceFrame(), mFrame->GetSize()).Intersects(aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
nsRegion
nsDisplayThemedBackground::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) {
nsRegion result;
*aSnap = false;
if (mThemeTransparency == nsITheme::eOpaque) {
result = nsRect(ToReferenceFrame(), mFrame->GetSize());
}
return result;
}
bool
nsDisplayThemedBackground::IsUniform(nsDisplayListBuilder* aBuilder, nscolor* aColor) {
if (mAppearance == NS_THEME_WIN_BORDERLESS_GLASS ||
mAppearance == NS_THEME_WIN_GLASS) {
*aColor = NS_RGBA(0,0,0,0);
return true;
}
return false;
}
nsRect
nsDisplayThemedBackground::GetPositioningArea()
{
return nsRect(ToReferenceFrame(), mFrame->GetSize());
}
void
nsDisplayThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
PaintInternal(aBuilder, aCtx, mVisibleRect, nullptr);
}
void
nsDisplayThemedBackground::PaintInternal(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx, const nsRect& aBounds,
nsRect* aClipRect)
{
// XXXzw this ignores aClipRect.
nsPresContext* presContext = mFrame->PresContext();
nsITheme *theme = presContext->GetTheme();
nsRect borderArea(ToReferenceFrame(), mFrame->GetSize());
nsRect drawing(borderArea);
theme->GetWidgetOverflow(presContext->DeviceContext(), mFrame, mAppearance,
&drawing);
drawing.IntersectRect(drawing, aBounds);
theme->DrawWidgetBackground(aCtx, mFrame, mAppearance, borderArea, drawing);
}
void nsDisplayThemedBackground::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion)
{
const nsDisplayThemedBackgroundGeometry* geometry = static_cast<const nsDisplayThemedBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (!positioningArea.IsEqualInterior(geometry->mPositioningArea)) {
// Invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
}
}
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<nsIFrame*> *aOutFrames)
{
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
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<nsIFrame*> *aOutFrames)
{
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
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<const nsDisplayBorderGeometry*>(aGeometry);
bool snap;
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
!geometry->mContentRect.IsEqualInterior(GetContentRect())) {
// We can probably get away with only invalidating the difference
// between the border and padding rects, but the XUL ui at least
// is apparently painting a background with this?
aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
}
}
void
nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect,
nsRect(offset, mFrame->GetSize()),
mFrame->StyleContext(),
mFrame->GetSkipSides());
}
nsRect
nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap)
{
nsRect borderBounds(ToReferenceFrame(), mFrame->GetSize());
borderBounds.Inflate(mFrame->StyleBorder()->GetImageOutset());
*aSnap = true;
return borderBounds;
}
// Given a region, compute a conservative approximation to it as a list
// of rectangles that aren't vertically adjacent (i.e., vertically
// adjacent or overlapping rectangles are combined).
// Right now this is only approximate, some vertically overlapping rectangles
// aren't guaranteed to be combined.
static void
ComputeDisjointRectangles(const nsRegion& aRegion,
nsTArray<nsRect>* aRects) {
nscoord accumulationMargin = nsPresContext::CSSPixelsToAppUnits(25);
nsRect accumulated;
nsRegionRectIterator iter(aRegion);
while (true) {
const nsRect* r = iter.Next();
if (r && !accumulated.IsEmpty() &&
accumulated.YMost() >= r->y - accumulationMargin) {
accumulated.UnionRect(accumulated, *r);
continue;
}
if (!accumulated.IsEmpty()) {
aRects->AppendElement(accumulated);
accumulated.SetEmpty();
}
if (!r)
break;
accumulated = *r;
}
}
void
nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
PROFILER_LABEL("nsDisplayBoxShadowOuter", "Paint");
for (uint32_t i = 0; i < rects.Length(); ++i) {
aCtx->PushState();
aCtx->IntersectClip(rects[i]);
nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame,
borderRect, rects[i]);
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
nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
nsAutoTArray<nsRect,10> rects;
ComputeDisjointRectangles(mVisibleRegion, &rects);
PROFILER_LABEL("nsDisplayBoxShadowInner", "Paint");
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;
}
nsIFrame *GetTransformRootFrame(nsIFrame* aFrame)
{
nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
while (parent && parent->Preserves3DChildren()) {
parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
}
return parent;
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayItem(aBuilder, aFrame) {
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) {
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) {
mList.AppendToTop(aItem);
mBounds = mList.GetBounds(aBuilder);
}
nsDisplayWrapList::~nsDisplayWrapList() {
mList.DeleteAll();
}
void
nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsRect
nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) {
*aSnap = false;
return mBounds;
}
bool
nsDisplayWrapList::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
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");
}
LayerState
nsDisplayWrapList::RequiredLayerStateForChildren(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aParameters,
const nsDisplayList& aList,
nsIFrame* aActiveScrolledRoot) {
LayerState result = LAYER_INACTIVE;
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
nsIFrame* f = i->Frame();
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(f, nullptr);
if (activeScrolledRoot != aActiveScrolledRoot && result == LAYER_INACTIVE) {
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_NONE) {
nsDisplayList* list = i->GetSameCoordinateSystemChildren();
if (list) {
LayerState childState = RequiredLayerStateForChildren(aBuilder, aManager, aParameters, *list, aActiveScrolledRoot);
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<Layer>
nsDisplayOpacity::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
if (mFrame->StyleDisplay()->mOpacity == 0 && mFrame->GetContent() &&
!nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(), eCSSProperty_opacity)) {
return nullptr;
}
nsRefPtr<Layer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, nullptr);
if (!container)
return nullptr;
container->SetOpacity(mFrame->StyleDisplay()->mOpacity);
AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, 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);
}
nsDisplayItem::LayerState
nsDisplayOpacity::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aParameters) {
if (mFrame->AreLayersMarkedActive(nsChangeHint_UpdateOpacityLayer) &&
!IsItemTooSmallForActiveLayer(this))
return LAYER_ACTIVE;
if (mFrame->GetContent()) {
if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(),
eCSSProperty_opacity)) {
return LAYER_ACTIVE;
}
}
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(mFrame, nullptr);
return RequiredLayerStateForChildren(aBuilder, aManager, aParameters, mList, activeScrolledRoot);
}
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<nsDisplayOpacity*>(aItem));
return true;
}
nsDisplayOwnLayer::nsDisplayOwnLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
uint32_t aFlags)
: nsDisplayWrapList(aBuilder, aFrame, aList)
, mFlags(aFlags) {
MOZ_COUNT_CTOR(nsDisplayOwnLayer);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayOwnLayer::~nsDisplayOwnLayer() {
MOZ_COUNT_DTOR(nsDisplayOwnLayer);
}
#endif
// nsDisplayOpacity uses layers for rendering
already_AddRefed<Layer>
nsDisplayOwnLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<Layer> layer = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, nullptr);
if (mFlags & GENERATE_SUBDOC_INVALIDATIONS) {
ContainerLayerPresContext* pres = new ContainerLayerPresContext;
pres->mPresContext = mFrame->PresContext();
layer->SetUserData(&gNotifySubDocInvalidationData, pres);
}
return layer.forget();
}
nsDisplayFixedPosition::nsDisplayFixedPosition(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsIFrame* aFixedPosFrame,
nsDisplayList* aList)
: nsDisplayOwnLayer(aBuilder, aFrame, aList)
, mFixedPosFrame(aFixedPosFrame) {
MOZ_COUNT_CTOR(nsDisplayFixedPosition);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayFixedPosition::~nsDisplayFixedPosition() {
MOZ_COUNT_DTOR(nsDisplayFixedPosition);
}
#endif
already_AddRefed<Layer>
nsDisplayFixedPosition::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<Layer> layer =
nsDisplayOwnLayer::BuildLayer(aBuilder, aManager, aContainerParameters);
// Work out the anchor point for this fixed position layer. We assume that
// any positioning set (left/top/right/bottom) indicates that the
// corresponding side of its container should be the anchor point,
// defaulting to top-left.
nsIFrame* viewportFrame = mFixedPosFrame->GetParent();
nsPresContext *presContext = viewportFrame->PresContext();
// Fixed position frames are reflowed into the scroll-port size if one has
// been set.
nsSize containingBlockSize = viewportFrame->GetSize();
if (presContext->PresShell()->IsScrollPositionClampingScrollPortSizeSet()) {
containingBlockSize = presContext->PresShell()->
GetScrollPositionClampingScrollPortSize();
}
// Find out the rect of the viewport frame relative to the reference frame.
// This, in conjunction with the container scale, will correspond to the
// coordinate-space of the built layer.
float factor = presContext->AppUnitsPerDevPixel();
nsPoint origin = viewportFrame->GetOffsetToCrossDoc(ReferenceFrame());
LayerRect anchorRect(NSAppUnitsToFloatPixels(origin.x, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(origin.y, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(containingBlockSize.width, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(containingBlockSize.height, factor) *
aContainerParameters.mYScale);
LayerPoint anchor = anchorRect.TopLeft();
const nsStylePosition* position = mFixedPosFrame->StylePosition();
if (position->mOffset.GetRightUnit() != eStyleUnit_Auto)
anchor.x = anchorRect.XMost();
if (position->mOffset.GetBottomUnit() != eStyleUnit_Auto)
anchor.y = anchorRect.YMost();
layer->SetFixedPositionAnchor(anchor);
// Also make sure the layer is aware of any fixed position margins that have
// been set.
nsMargin fixedMargins = presContext->PresShell()->GetContentDocumentFixedPositionMargins();
LayerMargin fixedLayerMargins(NSAppUnitsToFloatPixels(fixedMargins.top, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(fixedMargins.right, factor) *
aContainerParameters.mXScale,
NSAppUnitsToFloatPixels(fixedMargins.bottom, factor) *
aContainerParameters.mYScale,
NSAppUnitsToFloatPixels(fixedMargins.left, factor) *
aContainerParameters.mXScale);
// If the frame is auto-positioned on either axis, set the top/left layer
// margins to -1, to indicate to the compositor that this layer is
// unaffected by fixed margins.
if (position->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
position->mOffset.GetRightUnit() == eStyleUnit_Auto) {
fixedLayerMargins.left = -1;
}
if (position->mOffset.GetTopUnit() == eStyleUnit_Auto &&
position->mOffset.GetBottomUnit() == eStyleUnit_Auto) {
fixedLayerMargins.top = -1;
}
layer->SetFixedPositionMargins(fixedLayerMargins);
return layer.forget();
}
bool nsDisplayFixedPosition::TryMerge(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem) {
if (aItem->GetType() != TYPE_FIXED_POSITION)
return false;
// Items with the same fixed position frame can be merged.
nsDisplayFixedPosition* other = static_cast<nsDisplayFixedPosition*>(aItem);
if (other->mFixedPosFrame != mFixedPosFrame)
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)
{
#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)
{
#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)
{
#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
already_AddRefed<Layer>
nsDisplayScrollLayer::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters) {
nsRefPtr<ContainerLayer> 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::FindIDFor(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);
}
RecordFrameMetrics(mScrolledFrame, mScrollFrame, layer, mVisibleRect, viewport,
(usingDisplayport ? &displayport : nullptr),
(usingCriticalDisplayport ? &criticalDisplayport : nullptr),
scrollId, aContainerParameters, false);
return layer.forget();
}
bool
nsDisplayScrollLayer::ComputeVisibility(nsDisplayListBuilder* aBuilder,
nsRegion* aVisibleRegion,
const nsRect& aAllowVisibleRegionExpansion)
{
nsRect displayport;
if (nsLayoutUtils::GetDisplayPort(mScrolledFrame->GetContent(), &displayport)) {
// 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.
nsRegion childVisibleRegion = displayport + mScrollFrame->GetOffsetToCrossDoc(ReferenceFrame());
nsRect boundedRect =
childVisibleRegion.GetBounds().Intersect(mList.GetBounds(aBuilder));
nsRect allowExpansion = boundedRect.Intersect(aAllowVisibleRegionExpansion);
bool visible = mList.ComputeVisibilityForSublist(
aBuilder, &childVisibleRegion, boundedRect, allowExpansion);
// 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.
mVisibleRect = boundedRect;
return visible;
} else {
return nsDisplayWrapList::ComputeVisibility(aBuilder, aVisibleRegion,
aAllowVisibleRegionExpansion);
}
}
LayerState
nsDisplayScrollLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aParameters)
{
// Force this as a layer so we can scroll asynchronously.
// This causes incorrect rendering for rounded clips!
return LAYER_ACTIVE_FORCE;
}
bool
nsDisplayScrollLayer::TryMerge(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem)
{
if (aItem->GetType() != TYPE_SCROLL_LAYER) {
return false;
}
nsDisplayScrollLayer* other = static_cast<nsDisplayScrollLayer*>(aItem);
if (other->mScrolledFrame != this->mScrolledFrame) {
return false;
}
if (aItem->GetClip() != GetClip()) {
return false;
}
NS_ASSERTION(other->mReferenceFrame == mReferenceFrame,
"Must have the same reference frame!");
FrameProperties props = mScrolledFrame->Properties();
props.Set(nsIFrame::ScrollLayerCount(),
reinterpret_cast<void*>(GetScrollLayerCount() - 1));
// Swap frames with the other item before doing MergeFrom.
// XXX - This ensures that the frame associated with a scroll layer after
// merging is the first, rather than the last. This tends to change less,
// ensuring we're more likely to retain the associated gfx layer.
// See Bug 729534 and Bug 731641.
nsIFrame* tmp = mFrame;
mFrame = other->mFrame;
other->mFrame = tmp;
MergeFromTrackingMergedFrames(other);
return true;
}
bool
nsDisplayScrollLayer::ShouldFlattenAway(nsDisplayListBuilder* aBuilder)
{
return GetScrollLayerCount() > 1;
}
intptr_t
nsDisplayScrollLayer::GetScrollLayerCount()
{
FrameProperties props = mScrolledFrame->Properties();
#ifdef DEBUG
bool hasCount = false;
intptr_t result = reinterpret_cast<intptr_t>(
props.Get(nsIFrame::ScrollLayerCount(), &hasCount));
// If this aborts, then the property was either not added before scroll
// layers were created or the property was deleted to early. If the latter,
// make sure that nsDisplayScrollInfoLayer is on the bottom of the list so
// that it is processed last.
NS_ABORT_IF_FALSE(hasCount, "nsDisplayScrollLayer should always be defined");
return result;
#else
return reinterpret_cast<intptr_t>(props.Get(nsIFrame::ScrollLayerCount()));
#endif
}
intptr_t
nsDisplayScrollLayer::RemoveScrollLayerCount()
{
intptr_t result = GetScrollLayerCount();
FrameProperties props = mScrolledFrame->Properties();
props.Remove(nsIFrame::ScrollLayerCount());
return result;
}
nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
nsDisplayListBuilder* aBuilder,
nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame)
: nsDisplayScrollLayer(aBuilder, aScrollFrame, aScrolledFrame, aScrollFrame)
{
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
#endif
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer()
{
MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer);
}
#endif
LayerState
nsDisplayScrollInfoLayer::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& 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 RemoveScrollLayerCount() == 1;
}
nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
int32_t aAPD, int32_t aParentAPD,
uint32_t aFlags)
: nsDisplayOwnLayer(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 = nsDisplayWrapList::GetBounds(aBuilder, aSnap);
*aSnap = false;
return bounds.ConvertAppUnitsRoundOut(mAPD, mParentAPD);
}
void nsDisplayZoom::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
nsRect rect;
// A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1
// rect as well instead of possibly rounding the width or height to zero.
if (aRect.width == 1 && aRect.height == 1) {
rect.MoveTo(aRect.TopLeft().ConvertAppUnits(mParentAPD, mAPD));
rect.width = rect.height = 1;
} else {
rect = aRect.ConvertAppUnitsRoundOut(mParentAPD, mAPD);
}
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
void nsDisplayZoom::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
mList.PaintForFrame(aBuilder, aCtx, mFrame, nsDisplayList::PAINT_DEFAULT);
}
bool nsDisplayZoom::ComputeVisibility(nsDisplayListBuilder *aBuilder,
nsRegion *aVisibleRegion,
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 =
mList.ComputeVisibilityForSublist(aBuilder, &visibleRegion,
transformedVisibleRect,
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 <span> element with several continuations split over several
* lines, this function will return the rectangle containing all of those
* continuations. This rectangle is relative to the origin of the frame's local
* coordinate space.
*/
#ifndef UNIFIED_CONTINUATIONS
nsRect
nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!");
if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
// TODO: SVG needs to define what percentage translations resolve against.
return nsRect();
}
return nsRect(nsPoint(0, 0), aFrame->GetSize());
}
#else
nsRect
nsDisplayTransform::GetFrameBoundsForTransform(const nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Can't get the bounds of a nonexistent frame!");
nsRect result;
if (aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) {
// TODO: SVG needs to define what percentage translations resolve against.
return result;
}
/* Iterate through the continuation list, unioning together all the
* bounding rects.
*/
for (const nsIFrame *currFrame = aFrame->GetFirstContinuation();
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());
}
/* 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::GetDeltaToMozTransformOrigin(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
const nsRect* aBoundsOverride)
{
NS_PRECONDITION(aFrame, "Can't get delta for a null frame!");
NS_PRECONDITION(aFrame->IsTransformed(),
"Shouldn't get a delta for an untransformed frame!");
/* For both of the coordinates, if the value of -moz-transform is a
* percentage, it's relative to the size of the frame. Otherwise, if it's
* a distance, it's already computed for us!
*/
const nsStyleDisplay* display = aFrame->StyleDisplay();
nsRect boundingRect = (aBoundsOverride ? *aBoundsOverride :
nsDisplayTransform::GetFrameBoundsForTransform(aFrame));
/* Allows us to access named variables by index. */
float coords[3];
const nscoord* dimensions[2] =
{&boundingRect.width, &boundingRect.height};
for (uint8_t index = 0; index < 2; ++index) {
/* If the -moz-transform-origin specifies a percentage, take the percentage
* of the size of the box.
*/
const nsStyleCoord &coord = display->mTransformOrigin[index];
if (coord.GetUnit() == eStyleUnit_Calc) {
const nsStyleCoord::Calc *calc = coord.GetCalcValue();
coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
calc->mPercent +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
} else if (coord.GetUnit() == eStyleUnit_Percent) {
coords[index] =
NSAppUnitsToFloatPixels(*dimensions[index], aAppUnitsPerPixel) *
coord.GetPercentValue();
} else {
NS_ABORT_IF_FALSE(coord.GetUnit() == eStyleUnit_Coord, "unexpected unit");
coords[index] =
NSAppUnitsToFloatPixels(coord.GetCoordValue(), aAppUnitsPerPixel);
}
if ((aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT) &&
coord.GetUnit() != eStyleUnit_Percent) {
// <length> values represent offsets from the origin of the SVG element's
// user space, not the top left of its bounds, so we must adjust for that:
nscoord offset =
(index == 0) ? aFrame->GetPosition().x : aFrame->GetPosition().y;
coords[index] -= NSAppUnitsToFloatPixels(offset, aAppUnitsPerPixel);
}
}
coords[2] = NSAppUnitsToFloatPixels(display->mTransformOrigin[2].GetCoordValue(),
aAppUnitsPerPixel);
/* Adjust based on the origin of the rectangle. */
coords[0] += NSAppUnitsToFloatPixels(boundingRect.x, aAppUnitsPerPixel);
coords[1] += NSAppUnitsToFloatPixels(boundingRect.y, aAppUnitsPerPixel);
return 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::GetDeltaToMozPerspectiveOrigin(const nsIFrame* aFrame,
float aAppUnitsPerPixel)
{
NS_PRECONDITION(aFrame, "Can't get delta for a null frame!");
NS_PRECONDITION(aFrame->IsTransformed(),
"Shouldn't get a delta for an untransformed frame!");
/* 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)
, mToMozOrigin(GetDeltaToMozTransformOrigin(aFrame, aAppUnitsPerPixel, aBoundsOverride))
, mToPerspectiveOrigin(GetDeltaToMozPerspectiveOrigin(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.
gfxMatrix 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,
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.x0 *= pixelsPerCSSPx;
svgTransform.y0 *= pixelsPerCSSPx;
result = gfx3DMatrix::From2D(svgTransform);
}
if (hasSVGTransforms && !transformFromSVGParent.IsIdentity()) {
// Correct the translation components for zoom:
float pixelsPerCSSPx = frame->PresContext()->AppUnitsPerCSSPixel() /
aAppUnitsPerPixel;
transformFromSVGParent.x0 *= pixelsPerCSSPx;
transformFromSVGParent.y0 *= pixelsPerCSSPx;
result = result * gfx3DMatrix::From2D(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.mToMozOrigin, 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.mToMozOrigin, result) * parent;
}
return nsLayoutUtils::ChangeMatrixBasis
(rounded + aProperties.mToMozOrigin, result);
}
bool
nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder)
{
if (Frame()->AreLayersMarkedActive(nsChangeHint_UpdateOpacityLayer)) {
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
// nsChangeHint_UpdateTransformLayer will not be present yet.
if (!aFrame->AreLayersMarkedActive(nsChangeHint_UpdateTransformLayer) &&
(!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 is <= the
// reference frame size (~viewport), allowing a 1/8th fuzz factor
// for shadows, borders, etc.
refSize += nsSize(refSize.width / 8, refSize.height / 8);
nsSize frameSize = aFrame->GetVisualOverflowRectRelativeToSelf().Size();
if (frameSize <= refSize) {
// Bug 717521 - pre-render max 4096 x 4096 device pixels.
nscoord max = aFrame->PresContext()->DevPixelsToAppUnits(4096);
nsRect visual = aFrame->GetVisualOverflowRect();
if (visual.width <= max && visual.height <= max) {
return true;
}
}
if (aLogAnimations) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation disabled because frame size (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameSize.width));
message.AppendLiteral(", ");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(frameSize.height));
message.AppendLiteral(") is bigger than the viewport (");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.width));
message.AppendLiteral(", ");
message.AppendInt(nsPresContext::AppUnitsToIntCSSPixels(refSize.height));
message.AppendLiteral(")");
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(float aAppUnitsPerPixel)
{
if (mTransform.IsIdentity() || mCachedAppUnitsPerPixel != aAppUnitsPerPixel) {
gfxPoint3D newOrigin =
gfxPoint3D(NSAppUnitsToFloatPixels(mToReferenceFrame.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(mToReferenceFrame.y, aAppUnitsPerPixel),
0.0f);
if (mTransformGetter) {
mTransform = mTransformGetter(mFrame, aAppUnitsPerPixel);
mTransform = nsLayoutUtils::ChangeMatrixBasis(newOrigin, mTransform);
} else {
mTransform =
GetResultingTransformMatrix(mFrame, ToReferenceFrame(),
aAppUnitsPerPixel);
/**
* 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);
mCachedAppUnitsPerPixel = aAppUnitsPerPixel;
}
}
return mTransform;
}
bool
nsDisplayTransform::ShouldBuildLayerEvenIfInvisible(nsDisplayListBuilder* aBuilder)
{
return ShouldPrerenderTransformedContent(aBuilder, mFrame, false);
}
already_AddRefed<Layer> nsDisplayTransform::BuildLayer(nsDisplayListBuilder *aBuilder,
LayerManager *aManager,
const ContainerParameters& aContainerParameters)
{
const gfx3DMatrix& newTransformMatrix =
GetTransform(mFrame->PresContext()->AppUnitsPerDevPixel());
if (mFrame->StyleDisplay()->mBackfaceVisibility == NS_STYLE_BACKFACE_VISIBILITY_HIDDEN &&
newTransformMatrix.IsBackfaceVisible()) {
return nullptr;
}
nsRefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, *mStoredList.GetChildren(),
aContainerParameters, &newTransformMatrix,
FrameLayerBuilder::CONTAINER_NOT_CLIPPED_BY_ANCESTORS);
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);
}
AddAnimationsAndTransitionsToLayer(container, aBuilder,
this, 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 ContainerParameters& 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(mFrame->PresContext()->AppUnitsPerDevPixel()).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 (mFrame->AreLayersMarkedActive(nsChangeHint_UpdateTransformLayer) &&
!IsItemTooSmallForActiveLayer(this))
return LAYER_ACTIVE;
if (mFrame->GetContent()) {
if (nsLayoutUtils::HasAnimationsForCompositor(mFrame->GetContent(),
eCSSProperty_transform)) {
return LAYER_ACTIVE;
}
}
nsIFrame* activeScrolledRoot =
nsLayoutUtils::GetActiveScrolledRootFor(mFrame, nullptr);
return mStoredList.RequiredLayerStateForChildren(aBuilder,
aManager,
aParameters,
*mStoredList.GetChildren(),
activeScrolledRoot);
}
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;
float factor = nsPresContext::AppUnitsPerCSSPixel();
if (ShouldPrerenderTransformedContent(aBuilder, mFrame) ||
!UntransformRectMatrix(mVisibleRect,
GetTransform(factor),
factor,
&untransformedVisibleRect))
{
untransformedVisibleRect = mFrame->GetVisualOverflowRectRelativeToSelf();
}
nsRegion untransformedVisible = untransformedVisibleRect;
// Call RecomputeVisiblity instead of ComputeVisibility since
// nsDisplayItem::ComputeVisibility should only be called from
// nsDisplayList::ComputeVisibility (which sets mVisibleRect on the item)
mStoredList.RecomputeVisibility(aBuilder, &untransformedVisible);
return true;
}
#ifdef DEBUG_HIT
#include <time.h>
#endif
/* HitTest does some fun stuff with matrix transforms to obtain the answer. */
void nsDisplayTransform::HitTest(nsDisplayListBuilder *aBuilder,
const nsRect& aRect,
HitTestState *aState,
nsTArray<nsIFrame*> *aOutFrames)
{
/* Here's how this works:
* 1. Get the matrix. If it's singular, abort (clearly we didn't hit
* anything).
* 2. Invert the matrix.
* 3. Use it to transform the rect into the correct space.
* 4. Pass that rect down through to the list's version of HitTest.
*/
float factor = nsPresContext::AppUnitsPerCSSPixel();
gfx3DMatrix matrix = GetTransform(factor);
if (!IsFrameVisible(mFrame, matrix)) {
return;
}
/* We want to go from transformed-space to regular space.
* Thus we have to invert the matrix, which normally does
* the reverse operation (e.g. regular->transformed)
*/
/* Now, apply the transform and pass it down the channel. */
nsRect resultingRect;
if (aRect.width == 1 && aRect.height == 1) {
// Magic width/height indicating we're hit testing a point, not a rect
gfxPoint point = matrix.Inverse().ProjectPoint(
gfxPoint(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor)));
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.Inverse().ProjectRectBounds(originalRect);;
resultingRect = nsRect(NSFloatPixelsToAppUnits(float(rect.X()), factor),
NSFloatPixelsToAppUnits(float(rect.Y()), factor),
NSFloatPixelsToAppUnits(float(rect.Width()), factor),
NSFloatPixelsToAppUnits(float(rect.Height()), factor));
}
#ifdef DEBUG_HIT
printf("Frame: %p\n", dynamic_cast<void *>(mFrame));
printf(" Untransformed point: (%f, %f)\n", resultingRect.X(), resultingRect.Y());
uint32_t originalFrameCount = aOutFrames.Length();
#endif
mStoredList.HitTest(aBuilder, resultingRect, aState, aOutFrames);
#ifdef DEBUG_HIT
if (originalFrameCount != aOutFrames.Length())
printf(" Hit! Time: %f, first frame: %p\n", static_cast<double>(clock()),
dynamic_cast<void *>(aOutFrames.ElementAt(0)));
printf("=== end of hit test ===\n");
#endif
}
float
nsDisplayTransform::GetHitDepthAtPoint(const nsPoint& aPoint)
{
float factor = nsPresContext::AppUnitsPerCSSPixel();
gfx3DMatrix matrix = GetTransform(factor);
NS_ASSERTION(IsFrameVisible(mFrame, matrix), "We can't have hit a frame that isn't visible!");
gfxPoint point =
matrix.Inverse().ProjectPoint(gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor)));
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;
float factor = nsPresContext::AppUnitsPerCSSPixel();
return nsLayoutUtils::MatrixTransformRect(untransformedBounds,
GetTransform(factor),
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;
float factor = nsPresContext::AppUnitsPerCSSPixel();
// 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) ||
!UntransformRectMatrix(mVisibleRect, GetTransform(factor), factor, &untransformedVisible)) {
return nsRegion();
}
const gfx3DMatrix& matrix = GetTransform(nsPresContext::AppUnitsPerCSSPixel());
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;
float factor = nsPresContext::AppUnitsPerCSSPixel();
if (!UntransformRectMatrix(mVisibleRect, GetTransform(factor), factor, &untransformedVisible)) {
return false;
}
const gfx3DMatrix& matrix = GetTransform(nsPresContext::AppUnitsPerCSSPixel());
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<nsDisplayTransform*>(aItem)->mStoredList);
return true;
}
#endif
/* TransformRect takes in as parameters a rectangle (in app space) and returns
* the smallest rectangle (in app space) containing the transformed image of
* that rectangle. That is, it takes the four corners of the rectangle,
* transforms them according to the matrix associated with the specified frame,
* then returns the smallest rectangle containing the four transformed points.
*
* @param aUntransformedBounds The rectangle (in app units) to transform.
* @param aFrame The frame whose transformation should be applied.
* @param aOrigin The delta from the frame origin to the coordinate space origin
* @param aBoundsOverride (optional) Force the frame bounds to be the
* specified bounds.
* @return The smallest rectangle containing the image of the transformed
* rectangle.
*/
nsRect nsDisplayTransform::TransformRect(const nsRect &aUntransformedBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
const nsRect* aBoundsOverride)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
float factor = nsPresContext::AppUnitsPerCSSPixel();
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 = nsPresContext::AppUnitsPerCSSPixel();
return nsLayoutUtils::MatrixTransformRectOut
(aUntransformedBounds,
GetResultingTransformMatrix(aFrame, aOrigin, factor, aBoundsOverride),
factor);
}
bool nsDisplayTransform::UntransformRectMatrix(const nsRect &aUntransformedBounds,
const gfx3DMatrix& aMatrix,
float aAppUnitsPerPixel,
nsRect *aOutRect)
{
if (aMatrix.IsSingular())
return false;
gfxRect result(NSAppUnitsToFloatPixels(aUntransformedBounds.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aUntransformedBounds.y, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aUntransformedBounds.width, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aUntransformedBounds.height, aAppUnitsPerPixel));
/* We want to untransform the matrix, so invert the transformation first! */
result = aMatrix.Inverse().ProjectRectBounds(result);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(result, aAppUnitsPerPixel);
return true;
}
bool nsDisplayTransform::UntransformRect(const nsRect &aUntransformedBounds,
const nsIFrame* aFrame,
const nsPoint &aOrigin,
nsRect* aOutRect)
{
NS_PRECONDITION(aFrame, "Can't take the transform based on a null frame!");
/* Grab the matrix. If the transform is degenerate, just hand back the
* empty rect.
*/
float factor = nsPresContext::AppUnitsPerCSSPixel();
gfx3DMatrix matrix = GetResultingTransformMatrix(aFrame, aOrigin, factor);
return UntransformRectMatrix(aUntransformedBounds, matrix, factor, aOutRect);
}
nsDisplaySVGEffects::nsDisplaySVGEffects(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList),
mEffectsBounds(aFrame->GetVisualOverflowRectRelativeToSelf())
{
MOZ_COUNT_CTOR(nsDisplaySVGEffects);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplaySVGEffects::~nsDisplaySVGEffects()
{
MOZ_COUNT_DTOR(nsDisplaySVGEffects);
}
#endif
nsRegion nsDisplaySVGEffects::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap)
{
*aSnap = false;
return nsRegion();
}
void
nsDisplaySVGEffects::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
{
nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2);
if (nsSVGIntegrationUtils::HitTestFrameForEffects(mFrame,
rectCenter - ToReferenceFrame())) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
}
void
nsDisplaySVGEffects::PaintAsLayer(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx,
LayerManager* aManager)
{
nsSVGIntegrationUtils::PaintFramesWithEffects(aCtx, mFrame,
mVisibleRect,
aBuilder, aManager);
}
LayerState
nsDisplaySVGEffects::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aParameters)
{
return LAYER_SVG_EFFECTS;
}
already_AddRefed<Layer>
nsDisplaySVGEffects::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerParameters& aContainerParameters)
{
const nsIContent* content = mFrame->GetContent();
bool hasSVGLayout = (mFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT);
if (hasSVGLayout) {
nsISVGChildFrame *svgChildFrame = do_QueryFrame(mFrame);
if (!svgChildFrame || !mFrame->GetContent()->IsSVG()) {
NS_ASSERTION(false, "why?");
return nullptr;
}
if (!static_cast<const nsSVGElement*>(content)->HasValidDimensions()) {
return nullptr; // The SVG spec says not to draw filters for this
}
}
float opacity = mFrame->StyleDisplay()->mOpacity;
if (opacity == 0.0f)
return nullptr;
nsIFrame* firstFrame =
nsLayoutUtils::GetFirstContinuationOrSpecialSibling(mFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
bool isOK = true;
effectProperties.GetClipPathFrame(&isOK);
effectProperties.GetMaskFrame(&isOK);
effectProperties.GetFilterFrame(&isOK);
if (!isOK) {
return nullptr;
}
nsRefPtr<ContainerLayer> container = aManager->GetLayerBuilder()->
BuildContainerLayerFor(aBuilder, aManager, mFrame, this, mList,
aContainerParameters, 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<nsDisplaySVGEffects*>(aItem);
MergeFromTrackingMergedFrames(other);
mEffectsBounds.UnionRect(mEffectsBounds,
other->mEffectsBounds + other->mFrame->GetOffsetTo(mFrame));
return true;
}
#ifdef MOZ_DUMP_PAINTING
void
nsDisplaySVGEffects::PrintEffects(FILE* aOutput)
{
nsIFrame* firstFrame =
nsLayoutUtils::GetFirstContinuationOrSpecialSibling(mFrame);
nsSVGEffects::EffectProperties effectProperties =
nsSVGEffects::GetEffectProperties(firstFrame);
bool isOK = true;
nsSVGClipPathFrame *clipPathFrame = effectProperties.GetClipPathFrame(&isOK);
bool first = true;
fprintf(aOutput, " effects=(");
if (mFrame->StyleDisplay()->mOpacity != 1.0f) {
first = false;
fprintf(aOutput, "opacity(%f)", mFrame->StyleDisplay()->mOpacity);
}
if (clipPathFrame) {
if (!first) {
fprintf(aOutput, ", ");
}
fprintf(aOutput, "clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial");
first = false;
}
if (effectProperties.GetFilterFrame(&isOK)) {
if (!first) {
fprintf(aOutput, ", ");
}
fprintf(aOutput, "filter");
first = false;
}
if (effectProperties.GetMaskFrame(&isOK)) {
if (!first) {
fprintf(aOutput, ", ");
}
fprintf(aOutput, "mask");
}
fprintf(aOutput, ")");
}
#endif