Google Git
Sign in
android / platform / external / chromium_org / third_party / WebKit / 81c961c4effb2aa7c24b0514b1ff0af1fae479f2 / . / Source / core / rendering / compositing / CompositedLayerMapping.cpp
blob: 0b01a059bc5024efec1bad6b25daa9ad93aab017 [file] [log] [blame]
/*
* Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/rendering/compositing/CompositedLayerMapping.h"
#include "core/HTMLNames.h"
#include "core/fetch/ImageResource.h"
#include "core/html/HTMLCanvasElement.h"
#include "core/html/HTMLIFrameElement.h"
#include "core/html/HTMLMediaElement.h"
#include "core/html/canvas/CanvasRenderingContext.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/inspector/InspectorNodeIds.h"
#include "core/inspector/InspectorTraceEvents.h"
#include "core/page/Chrome.h"
#include "core/frame/FrameView.h"
#include "core/page/scrolling/ScrollingCoordinator.h"
#include "core/plugins/PluginView.h"
#include "core/rendering/FilterEffectRenderer.h"
#include "core/rendering/RenderImage.h"
#include "core/rendering/RenderLayerStackingNodeIterator.h"
#include "core/rendering/RenderVideo.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/compositing/RenderLayerCompositor.h"
#include "core/rendering/style/KeyframeList.h"
#include "platform/LengthFunctions.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/fonts/FontCache.h"
#include "platform/graphics/GraphicsContext.h"
#include "wtf/CurrentTime.h"
#include "wtf/text/StringBuilder.h"
using namespace std;
namespace WebCore {
using namespace HTMLNames;
static IntRect clipBox(RenderBox* renderer);
static IntRect contentsRect(const RenderObject* renderer)
{
if (!renderer->isBox())
return IntRect();
return renderer->isVideo() ?
toRenderVideo(renderer)->videoBox() :
pixelSnappedIntRect(toRenderBox(renderer)->contentBoxRect());
}
static IntRect backgroundRect(const RenderObject* renderer)
{
if (!renderer->isBox())
return IntRect();
LayoutRect rect;
const RenderBox* box = toRenderBox(renderer);
EFillBox clip = box->style()->backgroundClip();
switch (clip) {
case BorderFillBox:
rect = box->borderBoxRect();
break;
case PaddingFillBox:
rect = box->paddingBoxRect();
break;
case ContentFillBox:
rect = box->contentBoxRect();
break;
case TextFillBox:
break;
}
return pixelSnappedIntRect(rect);
}
static inline bool isAcceleratedCanvas(const RenderObject* renderer)
{
if (renderer->isCanvas()) {
HTMLCanvasElement* canvas = toHTMLCanvasElement(renderer->node());
if (CanvasRenderingContext* context = canvas->renderingContext())
return context->isAccelerated();
}
return false;
}
static bool hasBoxDecorations(const RenderStyle* style)
{
return style->hasBorder() || style->hasBorderRadius() || style->hasOutline() || style->hasAppearance() || style->boxShadow() || style->hasFilter();
}
static bool hasBoxDecorationsOrBackgroundImage(const RenderStyle* style)
{
return hasBoxDecorations(style) || style->hasBackgroundImage();
}
static bool contentLayerSupportsDirectBackgroundComposition(const RenderObject* renderer)
{
// No support for decorations - border, border-radius or outline.
// Only simple background - solid color or transparent.
if (hasBoxDecorationsOrBackgroundImage(renderer->style()))
return false;
// If there is no background, there is nothing to support.
if (!renderer->style()->hasBackground())
return true;
// Simple background that is contained within the contents rect.
return contentsRect(renderer).contains(backgroundRect(renderer));
}
static blink::WebLayer* platformLayerForPlugin(RenderObject* renderer)
{
if (!renderer->isEmbeddedObject())
return 0;
Widget* widget = toRenderEmbeddedObject(renderer)->widget();
if (!widget || !widget->isPluginView())
return 0;
return toPluginView(widget)->platformLayer();
}
static inline bool isAcceleratedContents(RenderObject* renderer)
{
return isAcceleratedCanvas(renderer)
|| (renderer->isEmbeddedObject() && toRenderEmbeddedObject(renderer)->requiresAcceleratedCompositing())
|| renderer->isVideo();
}
// Get the scrolling coordinator in a way that works inside CompositedLayerMapping's destructor.
static ScrollingCoordinator* scrollingCoordinatorFromLayer(RenderLayer& layer)
{
Page* page = layer.renderer()->frame()->page();
if (!page)
return 0;
return page->scrollingCoordinator();
}
CompositedLayerMapping::CompositedLayerMapping(RenderLayer& layer)
: m_owningLayer(layer)
, m_pendingUpdateScope(GraphicsLayerUpdateNone)
, m_isMainFrameRenderViewLayer(false)
, m_requiresOwnBackingStoreForIntrinsicReasons(true)
, m_requiresOwnBackingStoreForAncestorReasons(true)
, m_canCompositeFilters(false)
, m_backgroundLayerPaintsFixedRootBackground(false)
, m_scrollingContentsAreEmpty(false)
{
if (layer.isRootLayer() && renderer()->frame()->isMainFrame())
m_isMainFrameRenderViewLayer = true;
createPrimaryGraphicsLayer();
}
CompositedLayerMapping::~CompositedLayerMapping()
{
// Hits in compositing/squashing/squash-onto-nephew.html.
DisableCompositingQueryAsserts disabler;
// Do not leave the destroyed pointer dangling on any RenderLayers that painted to this mapping's squashing layer.
for (size_t i = 0; i < m_squashedLayers.size(); ++i) {
RenderLayer* oldSquashedLayer = m_squashedLayers[i].renderLayer;
if (oldSquashedLayer->groupedMapping() == this) {
oldSquashedLayer->setGroupedMapping(0, true);
oldSquashedLayer->setLostGroupedMapping(true);
}
}
updateClippingLayers(false, false);
updateOverflowControlsLayers(false, false, false);
updateChildTransformLayer(false);
updateForegroundLayer(false);
updateBackgroundLayer(false);
updateMaskLayer(false);
updateClippingMaskLayers(false);
updateScrollingLayers(false);
updateSquashingLayers(false);
destroyGraphicsLayers();
}
PassOwnPtr<GraphicsLayer> CompositedLayerMapping::createGraphicsLayer(CompositingReasons reasons)
{
GraphicsLayerFactory* graphicsLayerFactory = 0;
if (Page* page = renderer()->frame()->page())
graphicsLayerFactory = page->chrome().client().graphicsLayerFactory();
OwnPtr<GraphicsLayer> graphicsLayer = GraphicsLayer::create(graphicsLayerFactory, this);
graphicsLayer->setCompositingReasons(reasons);
if (Node* owningNode = m_owningLayer.renderer()->generatingNode())
graphicsLayer->setOwnerNodeId(InspectorNodeIds::idForNode(owningNode));
return graphicsLayer.release();
}
void CompositedLayerMapping::createPrimaryGraphicsLayer()
{
m_graphicsLayer = createGraphicsLayer(m_owningLayer.compositingReasons());
#if !OS(ANDROID)
if (m_isMainFrameRenderViewLayer)
m_graphicsLayer->contentLayer()->setDrawCheckerboardForMissingTiles(true);
#endif
updateOpacity(renderer()->style());
updateTransform(renderer()->style());
updateFilters(renderer()->style());
if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
updateLayerBlendMode(renderer()->style());
updateIsRootForIsolatedGroup();
}
}
void CompositedLayerMapping::destroyGraphicsLayers()
{
if (m_graphicsLayer)
m_graphicsLayer->removeFromParent();
m_ancestorClippingLayer = nullptr;
m_graphicsLayer = nullptr;
m_foregroundLayer = nullptr;
m_backgroundLayer = nullptr;
m_childContainmentLayer = nullptr;
m_childTransformLayer = nullptr;
m_maskLayer = nullptr;
m_childClippingMaskLayer = nullptr;
m_scrollingLayer = nullptr;
m_scrollingContentsLayer = nullptr;
m_scrollingBlockSelectionLayer = nullptr;
}
void CompositedLayerMapping::updateOpacity(const RenderStyle* style)
{
m_graphicsLayer->setOpacity(compositingOpacity(style->opacity()));
}
void CompositedLayerMapping::updateTransform(const RenderStyle* style)
{
// FIXME: This could use m_owningLayer.transform(), but that currently has transform-origin
// baked into it, and we don't want that.
TransformationMatrix t;
if (m_owningLayer.hasTransform()) {
style->applyTransform(t, toRenderBox(renderer())->pixelSnappedBorderBoxRect().size(), RenderStyle::ExcludeTransformOrigin);
makeMatrixRenderable(t, compositor()->hasAcceleratedCompositing());
}
m_graphicsLayer->setTransform(t);
}
void CompositedLayerMapping::updateFilters(const RenderStyle* style)
{
unsigned didCompositeFilters = m_canCompositeFilters;
m_canCompositeFilters = m_graphicsLayer->setFilters(owningLayer().computeFilterOperations(style));
if (didCompositeFilters != m_canCompositeFilters) {
//
// If filters used to be painted in software and are now painted in the compositor, we need to:
// (1) Remove the FilterEffectRenderer, which was used for painting filters in software.
// (2) Repaint the layer contents to remove the software-applied filter because the compositor will apply it.
//
// Similarly, if filters used to be painted in the compositor and are now painted in software, we need to:
// (1) Create a FilterEffectRenderer.
// (2) Repaint the layer contents to apply a software filter because the compositor won't apply it.
//
m_owningLayer.updateOrRemoveFilterEffectRenderer();
setContentsNeedDisplay();
}
}
void CompositedLayerMapping::updateLayerBlendMode(const RenderStyle* style)
{
setBlendMode(style->blendMode());
}
void CompositedLayerMapping::updateIsRootForIsolatedGroup()
{
bool isolate = m_owningLayer.shouldIsolateCompositedDescendants();
// non stacking context layers should never isolate
ASSERT(m_owningLayer.stackingNode()->isStackingContext() || !isolate);
m_graphicsLayer->setIsRootForIsolatedGroup(isolate);
}
void CompositedLayerMapping::updateContentsOpaque()
{
// For non-root layers, background is always painted by the primary graphics layer.
ASSERT(m_isMainFrameRenderViewLayer || !m_backgroundLayer);
if (m_backgroundLayer) {
m_graphicsLayer->setContentsOpaque(false);
m_backgroundLayer->setContentsOpaque(m_owningLayer.backgroundIsKnownToBeOpaqueInRect(compositedBounds()));
} else {
m_graphicsLayer->setContentsOpaque(m_owningLayer.backgroundIsKnownToBeOpaqueInRect(compositedBounds()));
}
}
void CompositedLayerMapping::updateCompositedBounds(GraphicsLayerUpdater::UpdateType updateType)
{
if (!shouldUpdateGraphicsLayer(updateType))
return;
// FIXME: if this is really needed for performance, it would be better to store it on RenderLayer.
m_compositedBounds = m_owningLayer.boundingBoxForCompositing();
}
void CompositedLayerMapping::updateAfterWidgetResize()
{
if (renderer()->isRenderPart()) {
if (RenderLayerCompositor* innerCompositor = RenderLayerCompositor::frameContentsCompositor(toRenderPart(renderer()))) {
innerCompositor->frameViewDidChangeSize();
// We can floor this point because our frameviews are always aligned to pixel boundaries.
ASSERT(contentsBox().location() == flooredIntPoint(contentsBox().location()));
innerCompositor->frameViewDidChangeLocation(flooredIntPoint(contentsBox().location()));
}
}
}
void CompositedLayerMapping::updateCompositingReasons()
{
// All other layers owned by this mapping will have the same compositing reason
// for their lifetime, so they are initialized only when created.
m_graphicsLayer->setCompositingReasons(m_owningLayer.compositingReasons());
}
bool CompositedLayerMapping::updateGraphicsLayerConfiguration(GraphicsLayerUpdater::UpdateType updateType)
{
if (!shouldUpdateGraphicsLayer(updateType))
return false;
RenderLayerCompositor* compositor = this->compositor();
RenderObject* renderer = this->renderer();
m_owningLayer.updateDescendantDependentFlags();
m_owningLayer.stackingNode()->updateZOrderLists();
bool layerConfigChanged = false;
setBackgroundLayerPaintsFixedRootBackground(compositor->needsFixedRootBackgroundLayer(&m_owningLayer));
// The background layer is currently only used for fixed root backgrounds.
if (updateBackgroundLayer(m_backgroundLayerPaintsFixedRootBackground))
layerConfigChanged = true;
if (updateForegroundLayer(compositor->needsContentsCompositingLayer(&m_owningLayer)))
layerConfigChanged = true;
bool needsDescendantsClippingLayer = compositor->clipsCompositingDescendants(&m_owningLayer);
// Our scrolling layer will clip.
if (m_owningLayer.needsCompositedScrolling())
needsDescendantsClippingLayer = false;
RenderLayer* scrollParent = compositor->acceleratedCompositingForOverflowScrollEnabled() ? m_owningLayer.scrollParent() : 0;
bool needsAncestorClip = compositor->clippedByNonAncestorInStackingTree(&m_owningLayer);
if (scrollParent) {
// If our containing block is our ancestor scrolling layer, then we'll already be clipped
// to it via our scroll parent and we don't need an ancestor clipping layer.
if (m_owningLayer.renderer()->containingBlock()->enclosingLayer() == m_owningLayer.ancestorScrollingLayer())
needsAncestorClip = false;
}
if (updateClippingLayers(needsAncestorClip, needsDescendantsClippingLayer))
layerConfigChanged = true;
if (updateOverflowControlsLayers(requiresHorizontalScrollbarLayer(), requiresVerticalScrollbarLayer(), requiresScrollCornerLayer()))
layerConfigChanged = true;
bool scrollingConfigChanged = false;
if (updateScrollingLayers(m_owningLayer.needsCompositedScrolling())) {
layerConfigChanged = true;
scrollingConfigChanged = true;
}
bool hasPerspective = false;
if (RenderStyle* style = renderer->style())
hasPerspective = style->hasPerspective();
bool needsChildTransformLayer = hasPerspective && (layerForChildrenTransform() == m_childTransformLayer.get()) && renderer->isBox();
if (updateChildTransformLayer(needsChildTransformLayer))
layerConfigChanged = true;
updateScrollParent(scrollParent);
updateClipParent(m_owningLayer.clipParent());
if (updateSquashingLayers(!m_squashedLayers.isEmpty()))
layerConfigChanged = true;
if (layerConfigChanged)
updateInternalHierarchy();
if (scrollingConfigChanged) {
if (renderer->view())
compositor->scrollingLayerDidChange(&m_owningLayer);
}
// A mask layer is not part of the hierarchy proper, it's an auxiliary layer
// that's plugged into another GraphicsLayer that is part of the hierarchy.
// It has no parent or child GraphicsLayer. For that reason, we process it
// here, after the hierarchy has been updated.
bool maskLayerChanged = false;
if (updateMaskLayer(renderer->hasMask())) {
maskLayerChanged = true;
m_graphicsLayer->setMaskLayer(m_maskLayer.get());
}
bool hasChildClippingLayer = compositor->clipsCompositingDescendants(&m_owningLayer) && (hasClippingLayer() || hasScrollingLayer());
// If we have a border radius or clip path on a scrolling layer, we need a clipping mask to properly
// clip the scrolled contents, even if there are no composited descendants.
bool hasClipPath = renderer->style()->clipPath();
bool needsChildClippingMask = (hasClipPath || renderer->style()->hasBorderRadius()) && (hasChildClippingLayer || isAcceleratedContents(renderer) || hasScrollingLayer());
if (updateClippingMaskLayers(needsChildClippingMask)) {
// Clip path clips the entire subtree, including scrollbars. It must be attached directly onto
// the main m_graphicsLayer.
if (hasClipPath)
m_graphicsLayer->setMaskLayer(m_childClippingMaskLayer.get());
else if (hasClippingLayer())
clippingLayer()->setMaskLayer(m_childClippingMaskLayer.get());
else if (hasScrollingLayer())
scrollingLayer()->setMaskLayer(m_childClippingMaskLayer.get());
else if (isAcceleratedContents(renderer))
m_graphicsLayer->setContentsClippingMaskLayer(m_childClippingMaskLayer.get());
}
if (m_owningLayer.reflectionInfo()) {
if (m_owningLayer.reflectionInfo()->reflectionLayer()->hasCompositedLayerMapping()) {
GraphicsLayer* reflectionLayer = m_owningLayer.reflectionInfo()->reflectionLayer()->compositedLayerMapping()->mainGraphicsLayer();
m_graphicsLayer->setReplicatedByLayer(reflectionLayer);
}
} else {
m_graphicsLayer->setReplicatedByLayer(0);
}
updateBackgroundColor();
if (isDirectlyCompositedImage())
updateImageContents();
if (blink::WebLayer* layer = platformLayerForPlugin(renderer)) {
m_graphicsLayer->setContentsToPlatformLayer(layer);
} else if (renderer->node() && renderer->node()->isFrameOwnerElement() && toHTMLFrameOwnerElement(renderer->node())->contentFrame()) {
blink::WebLayer* layer = toHTMLFrameOwnerElement(renderer->node())->contentFrame()->remotePlatformLayer();
if (layer)
m_graphicsLayer->setContentsToPlatformLayer(layer);
} else if (renderer->isVideo()) {
HTMLMediaElement* mediaElement = toHTMLMediaElement(renderer->node());
m_graphicsLayer->setContentsToPlatformLayer(mediaElement->platformLayer());
} else if (isAcceleratedCanvas(renderer)) {
HTMLCanvasElement* canvas = toHTMLCanvasElement(renderer->node());
if (CanvasRenderingContext* context = canvas->renderingContext())
m_graphicsLayer->setContentsToPlatformLayer(context->platformLayer());
layerConfigChanged = true;
}
if (renderer->isRenderPart())
layerConfigChanged = RenderLayerCompositor::parentFrameContentLayers(toRenderPart(renderer));
// Changes to either the internal hierarchy or the mask layer have an impact
// on painting phases, so we need to update when either are updated.
if (layerConfigChanged || maskLayerChanged)
updatePaintingPhases();
return layerConfigChanged;
}
static IntRect clipBox(RenderBox* renderer)
{
LayoutRect result = PaintInfo::infiniteRect();
if (renderer->hasOverflowClip())
result = renderer->overflowClipRect(LayoutPoint());
if (renderer->hasClip())
result.intersect(renderer->clipRect(LayoutPoint()));
return pixelSnappedIntRect(result);
}
static LayoutPoint computeOffsetFromCompositedAncestor(const RenderLayer* layer, const RenderLayer* compositedAncestor)
{
LayoutPoint offset;
layer->convertToLayerCoords(compositedAncestor, offset);
if (compositedAncestor)
offset.move(compositedAncestor->compositedLayerMapping()->owningLayer().subpixelAccumulation());
return offset;
}
void CompositedLayerMapping::computeBoundsOfOwningLayer(const RenderLayer* compositedAncestor, IntRect& localBounds, IntRect& compositingBoundsRelativeToCompositedAncestor, LayoutPoint& offsetFromCompositedAncestor,
IntPoint& snappedOffsetFromCompositedAncestor)
{
LayoutRect localRawCompositingBounds = compositedBounds();
offsetFromCompositedAncestor = computeOffsetFromCompositedAncestor(&m_owningLayer, compositedAncestor);
snappedOffsetFromCompositedAncestor = IntPoint(offsetFromCompositedAncestor.x().round(), offsetFromCompositedAncestor.y().round());
LayoutSize subpixelAccumulation = offsetFromCompositedAncestor - snappedOffsetFromCompositedAncestor;
m_owningLayer.setSubpixelAccumulation(subpixelAccumulation);
// Move the bounds by the subpixel accumulation so that it pixel-snaps relative to absolute pixels instead of local coordinates.
localRawCompositingBounds.move(subpixelAccumulation);
localBounds = pixelSnappedIntRect(localRawCompositingBounds);
compositingBoundsRelativeToCompositedAncestor = localBounds;
compositingBoundsRelativeToCompositedAncestor.moveBy(snappedOffsetFromCompositedAncestor);
}
void CompositedLayerMapping::updateSquashingLayerGeometry(const LayoutPoint& offsetFromCompositedAncestor, const IntPoint& graphicsLayerParentLocation, const RenderLayer& referenceLayer,
Vector<GraphicsLayerPaintInfo>& layers, GraphicsLayer* squashingLayer, LayoutPoint* offsetFromTransformedAncestor, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
{
if (!squashingLayer)
return;
ASSERT(compositor()->layerSquashingEnabled());
LayoutPoint offsetFromReferenceLayerToParentGraphicsLayer(offsetFromCompositedAncestor);
offsetFromReferenceLayerToParentGraphicsLayer.moveBy(-graphicsLayerParentLocation);
// FIXME: Cache these offsets.
LayoutPoint referenceOffsetFromTransformedAncestor = referenceLayer.computeOffsetFromTransformedAncestor();
LayoutRect totalSquashBounds;
for (size_t i = 0; i < layers.size(); ++i) {
LayoutRect squashedBounds = layers[i].renderLayer->boundingBoxForCompositing();
// Store the local bounds of the RenderLayer subtree before applying the offset.
layers[i].compositedBounds = squashedBounds;
LayoutPoint offsetFromTransformedAncestorForSquashedLayer = layers[i].renderLayer->computeOffsetFromTransformedAncestor();
LayoutSize offsetFromSquashingLayer = offsetFromTransformedAncestorForSquashedLayer - referenceOffsetFromTransformedAncestor;
squashedBounds.move(offsetFromSquashingLayer);
totalSquashBounds.unite(squashedBounds);
}
// The totalSquashBounds is positioned with respect to referenceLayer of this CompositedLayerMapping.
// But the squashingLayer needs to be positioned with respect to the ancestor CompositedLayerMapping.
// The conversion between referenceLayer and the ancestor CLM is already computed as
// offsetFromReferenceLayerToParentGraphicsLayer.
totalSquashBounds.moveBy(offsetFromReferenceLayerToParentGraphicsLayer);
IntRect squashLayerBounds = enclosingIntRect(totalSquashBounds);
IntPoint squashLayerOrigin = squashLayerBounds.location();
LayoutSize squashLayerOriginInOwningLayerSpace = squashLayerOrigin - offsetFromReferenceLayerToParentGraphicsLayer;
// Now that the squashing bounds are known, we can convert the RenderLayer painting offsets
// from CLM owning layer space to the squashing layer space.
//
// The painting offset we want to compute for each squashed RenderLayer is essentially the position of
// the squashed RenderLayer described w.r.t. referenceLayer's origin. For this purpose we already cached
// offsetFromSquashingCLM before, which describes where the squashed RenderLayer is located w.r.t.
// referenceLayer. So we just need to convert that point from referenceLayer space to referenceLayer
// space. This is simply done by subtracing squashLayerOriginInOwningLayerSpace, but then the offset
// overall needs to be negated because that's the direction that the painting code expects the
// offset to be.
for (size_t i = 0; i < layers.size(); ++i) {
LayoutPoint offsetFromTransformedAncestorForSquashedLayer = layers[i].renderLayer->computeOffsetFromTransformedAncestor();
LayoutSize offsetFromSquashLayerOrigin = (offsetFromTransformedAncestorForSquashedLayer - referenceOffsetFromTransformedAncestor) - squashLayerOriginInOwningLayerSpace;
// It is ok to repaint here, because all of the geometry needed to correctly repaint is computed by this point.
IntSize newOffsetFromRenderer = -IntSize(offsetFromSquashLayerOrigin.width().round(), offsetFromSquashLayerOrigin.height().round());
LayoutSize subpixelAccumulation = offsetFromSquashLayerOrigin + newOffsetFromRenderer;
if (layers[i].offsetFromRendererSet && layers[i].offsetFromRenderer != newOffsetFromRenderer) {
layers[i].renderLayer->repainter().repaintIncludingNonCompositingDescendants();
layersNeedingPaintInvalidation.append(layers[i].renderLayer);
}
layers[i].offsetFromRenderer = newOffsetFromRenderer;
layers[i].offsetFromRendererSet = true;
layers[i].renderLayer->setSubpixelAccumulation(subpixelAccumulation);
// FIXME: find a better design to avoid this redundant value - most likely it will make
// sense to move the paint task info into RenderLayer's m_compositingProperties.
layers[i].renderLayer->setOffsetFromSquashingLayerOrigin(layers[i].offsetFromRenderer);
}
squashingLayer->setPosition(squashLayerBounds.location());
squashingLayer->setSize(squashLayerBounds.size());
*offsetFromTransformedAncestor = referenceOffsetFromTransformedAncestor;
offsetFromTransformedAncestor->move(squashLayerOriginInOwningLayerSpace);
for (size_t i = 0; i < layers.size(); ++i)
layers[i].localClipRectForSquashedLayer = localClipRectForSquashedLayer(referenceLayer, layers[i], layers);
}
void CompositedLayerMapping::updateGraphicsLayerGeometry(GraphicsLayerUpdater::UpdateType updateType, const RenderLayer* compositingContainer, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
{
if (!shouldUpdateGraphicsLayer(updateType))
return;
// Set transform property, if it is not animating. We have to do this here because the transform
// is affected by the layer dimensions.
if (!renderer()->style()->isRunningTransformAnimationOnCompositor())
updateTransform(renderer()->style());
// Set opacity, if it is not animating.
if (!renderer()->style()->isRunningOpacityAnimationOnCompositor())
updateOpacity(renderer()->style());
m_owningLayer.updateDescendantDependentFlags();
// We compute everything relative to the enclosing compositing layer.
IntRect ancestorCompositingBounds;
if (compositingContainer) {
ASSERT(compositingContainer->hasCompositedLayerMapping());
ancestorCompositingBounds = compositingContainer->compositedLayerMapping()->pixelSnappedCompositedBounds();
}
IntRect localCompositingBounds;
IntRect relativeCompositingBounds;
LayoutPoint offsetFromCompositedAncestor;
IntPoint snappedOffsetFromCompositedAncestor;
computeBoundsOfOwningLayer(compositingContainer, localCompositingBounds, relativeCompositingBounds, offsetFromCompositedAncestor, snappedOffsetFromCompositedAncestor);
IntPoint graphicsLayerParentLocation;
computeGraphicsLayerParentLocation(compositingContainer, ancestorCompositingBounds, graphicsLayerParentLocation);
// Might update graphicsLayerParentLocation.
updateAncestorClippingLayerGeometry(compositingContainer, snappedOffsetFromCompositedAncestor, graphicsLayerParentLocation);
FloatSize contentsSize = relativeCompositingBounds.size();
updateMainGraphicsLayerGeometry(relativeCompositingBounds, localCompositingBounds, graphicsLayerParentLocation);
updateSquashingLayerGeometry(offsetFromCompositedAncestor, graphicsLayerParentLocation, m_owningLayer, m_squashedLayers, m_squashingLayer.get(), &m_squashingLayerOffsetFromTransformedAncestor, layersNeedingPaintInvalidation);
// If we have a layer that clips children, position it.
IntRect clippingBox;
if (m_childContainmentLayer)
clippingBox = clipBox(toRenderBox(renderer()));
updateChildContainmentLayerGeometry(clippingBox, localCompositingBounds);
updateChildTransformLayerGeometry();
updateMaskLayerGeometry();
updateTransformGeometry(snappedOffsetFromCompositedAncestor, relativeCompositingBounds);
updateForegroundLayerGeometry(contentsSize, clippingBox);
updateBackgroundLayerGeometry(contentsSize);
updateReflectionLayerGeometry(layersNeedingPaintInvalidation);
updateScrollingLayerGeometry(localCompositingBounds);
updateChildClippingMaskLayerGeometry();
if (m_owningLayer.scrollableArea() && m_owningLayer.scrollableArea()->scrollsOverflow())
m_owningLayer.scrollableArea()->positionOverflowControls(IntSize());
if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
updateLayerBlendMode(renderer()->style());
updateIsRootForIsolatedGroup();
}
updateContentsRect();
updateBackgroundColor();
updateDrawsContent();
updateContentsOpaque();
updateAfterWidgetResize();
updateRenderingContext();
updateShouldFlattenTransform();
updateChildrenTransform();
updateScrollParent(compositor()->acceleratedCompositingForOverflowScrollEnabled() ? m_owningLayer.scrollParent() : 0);
registerScrollingLayers();
updateCompositingReasons();
}
void CompositedLayerMapping::updateMainGraphicsLayerGeometry(const IntRect& relativeCompositingBounds, const IntRect& localCompositingBounds, IntPoint& graphicsLayerParentLocation)
{
m_graphicsLayer->setPosition(FloatPoint(relativeCompositingBounds.location() - graphicsLayerParentLocation));
m_graphicsLayer->setOffsetFromRenderer(toIntSize(localCompositingBounds.location()));
FloatSize oldSize = m_graphicsLayer->size();
const IntSize& contentsSize = relativeCompositingBounds.size();
if (oldSize != contentsSize)
m_graphicsLayer->setSize(contentsSize);
// m_graphicsLayer is the corresponding GraphicsLayer for this RenderLayer and its non-compositing
// descendants. So, the visibility flag for m_graphicsLayer should be true if there are any
// non-compositing visible layers.
bool contentsVisible = m_owningLayer.hasVisibleContent() || hasVisibleNonCompositingDescendant(&m_owningLayer);
if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled() && renderer()->isVideo()) {
HTMLMediaElement* mediaElement = toHTMLMediaElement(renderer()->node());
if (mediaElement->isFullscreen())
contentsVisible = false;
}
m_graphicsLayer->setContentsVisible(contentsVisible);
m_graphicsLayer->setBackfaceVisibility(renderer()->style()->backfaceVisibility() == BackfaceVisibilityVisible);
}
void CompositedLayerMapping::computeGraphicsLayerParentLocation(const RenderLayer* compositingContainer, const IntRect& ancestorCompositingBounds, IntPoint& graphicsLayerParentLocation)
{
if (compositingContainer && compositingContainer->compositedLayerMapping()->hasClippingLayer()) {
// If the compositing ancestor has a layer to clip children, we parent in that, and therefore
// position relative to it.
IntRect clippingBox = clipBox(toRenderBox(compositingContainer->renderer()));
graphicsLayerParentLocation = clippingBox.location() + roundedIntSize(compositingContainer->subpixelAccumulation());
} else if (compositingContainer && compositingContainer->compositedLayerMapping()->childTransformLayer()) {
// Similarly, if the compositing ancestor has a child transform layer, we parent in that, and therefore
// position relative to it. It's already taken into account the contents offset, so we do not need to here.
graphicsLayerParentLocation = roundedIntPoint(compositingContainer->subpixelAccumulation());
} else if (compositingContainer) {
graphicsLayerParentLocation = ancestorCompositingBounds.location();
} else {
graphicsLayerParentLocation = renderer()->view()->documentRect().location();
}
if (compositingContainer && compositingContainer->needsCompositedScrolling()) {
RenderBox* renderBox = toRenderBox(compositingContainer->renderer());
IntSize scrollOffset = renderBox->scrolledContentOffset();
IntPoint scrollOrigin(renderBox->borderLeft(), renderBox->borderTop());
graphicsLayerParentLocation = scrollOrigin - scrollOffset;
}
}
void CompositedLayerMapping::updateAncestorClippingLayerGeometry(const RenderLayer* compositingContainer, const IntPoint& snappedOffsetFromCompositedAncestor, IntPoint& graphicsLayerParentLocation)
{
if (!compositingContainer || !m_ancestorClippingLayer)
return;
// FIXME: this should use cached clip rects, but this sometimes give
// inaccurate results (and trips the ASSERTS in RenderLayerClipper).
ClipRectsContext clipRectsContext(compositingContainer, TemporaryClipRects, IgnoreOverlayScrollbarSize, IgnoreOverflowClip);
IntRect parentClipRect = pixelSnappedIntRect(m_owningLayer.clipper().backgroundClipRect(clipRectsContext).rect());
ASSERT(parentClipRect != PaintInfo::infiniteRect());
m_ancestorClippingLayer->setPosition(FloatPoint(parentClipRect.location() - graphicsLayerParentLocation));
m_ancestorClippingLayer->setSize(parentClipRect.size());
// backgroundRect is relative to compositingContainer, so subtract snappedOffsetFromCompositedAncestor.X/snappedOffsetFromCompositedAncestor.Y to get back to local coords.
m_ancestorClippingLayer->setOffsetFromRenderer(parentClipRect.location() - snappedOffsetFromCompositedAncestor);
// The primary layer is then parented in, and positioned relative to this clipping layer.
graphicsLayerParentLocation = parentClipRect.location();
}
void CompositedLayerMapping::updateChildContainmentLayerGeometry(const IntRect& clippingBox, const IntRect& localCompositingBounds)
{
if (!m_childContainmentLayer)
return;
m_childContainmentLayer->setPosition(FloatPoint(clippingBox.location() - localCompositingBounds.location() + roundedIntSize(m_owningLayer.subpixelAccumulation())));
m_childContainmentLayer->setSize(clippingBox.size());
m_childContainmentLayer->setOffsetFromRenderer(toIntSize(clippingBox.location()));
if (m_childClippingMaskLayer && !m_scrollingLayer && !renderer()->style()->clipPath()) {
m_childClippingMaskLayer->setPosition(m_childContainmentLayer->position());
m_childClippingMaskLayer->setSize(m_childContainmentLayer->size());
m_childClippingMaskLayer->setOffsetFromRenderer(m_childContainmentLayer->offsetFromRenderer());
}
}
void CompositedLayerMapping::updateChildTransformLayerGeometry()
{
if (!m_childTransformLayer)
return;
const IntRect borderBox = toRenderBox(m_owningLayer.renderer())->pixelSnappedBorderBoxRect();
m_childTransformLayer->setSize(borderBox.size());
m_childTransformLayer->setPosition(FloatPoint(contentOffsetInCompositingLayer()));
}
void CompositedLayerMapping::updateMaskLayerGeometry()
{
if (!m_maskLayer)
return;
if (m_maskLayer->size() != m_graphicsLayer->size()) {
m_maskLayer->setSize(m_graphicsLayer->size());
m_maskLayer->setNeedsDisplay();
}
m_maskLayer->setPosition(FloatPoint());
m_maskLayer->setOffsetFromRenderer(m_graphicsLayer->offsetFromRenderer());
}
void CompositedLayerMapping::updateTransformGeometry(const IntPoint& snappedOffsetFromCompositedAncestor, const IntRect& relativeCompositingBounds)
{
if (m_owningLayer.hasTransform()) {
const LayoutRect borderBox = toRenderBox(renderer())->borderBoxRect();
// Get layout bounds in the coords of compositingContainer to match relativeCompositingBounds.
IntRect layerBounds = pixelSnappedIntRect(toLayoutPoint(m_owningLayer.subpixelAccumulation()), borderBox.size());
layerBounds.moveBy(snappedOffsetFromCompositedAncestor);
// Update properties that depend on layer dimensions
FloatPoint3D transformOrigin = computeTransformOrigin(IntRect(IntPoint(), layerBounds.size()));
// |transformOrigin| is in the local space of this layer. layerBounds - relativeCompositingBounds converts to the space of the
// compositing bounds relative to the composited ancestor. This does not apply to the z direction, since the page is 2D.
FloatPoint3D compositedTransformOrigin(
layerBounds.x() - relativeCompositingBounds.x() + transformOrigin.x(),
layerBounds.y() - relativeCompositingBounds.y() + transformOrigin.y(),
transformOrigin.z());
m_graphicsLayer->setTransformOrigin(compositedTransformOrigin);
} else {
FloatPoint3D compositedTransformOrigin(
relativeCompositingBounds.width() * 0.5f,
relativeCompositingBounds.height() * 0.5f,
0.f);
m_graphicsLayer->setTransformOrigin(compositedTransformOrigin);
}
}
void CompositedLayerMapping::updateReflectionLayerGeometry(Vector<RenderLayer*>& layersNeedingPaintInvalidation)
{
if (!m_owningLayer.reflectionInfo() || !m_owningLayer.reflectionInfo()->reflectionLayer()->hasCompositedLayerMapping())
return;
CompositedLayerMappingPtr reflectionCompositedLayerMapping = m_owningLayer.reflectionInfo()->reflectionLayer()->compositedLayerMapping();
reflectionCompositedLayerMapping->updateGraphicsLayerGeometry(GraphicsLayerUpdater::ForceUpdate, &m_owningLayer, layersNeedingPaintInvalidation);
}
void CompositedLayerMapping::updateScrollingLayerGeometry(const IntRect& localCompositingBounds)
{
if (!m_scrollingLayer)
return;
ASSERT(m_scrollingContentsLayer);
RenderBox* renderBox = toRenderBox(renderer());
IntRect clientBox = enclosingIntRect(renderBox->clientBoxRect());
IntSize adjustedScrollOffset = m_owningLayer.scrollableArea()->adjustedScrollOffset();
m_scrollingLayer->setPosition(FloatPoint(clientBox.location() - localCompositingBounds.location() + roundedIntSize(m_owningLayer.subpixelAccumulation())));
m_scrollingLayer->setSize(clientBox.size());
IntSize oldScrollingLayerOffset = m_scrollingLayer->offsetFromRenderer();
m_scrollingLayer->setOffsetFromRenderer(-toIntSize(clientBox.location()));
if (m_childClippingMaskLayer && !renderer()->style()->clipPath()) {
m_childClippingMaskLayer->setPosition(m_scrollingLayer->position());
m_childClippingMaskLayer->setSize(m_scrollingLayer->size());
m_childClippingMaskLayer->setOffsetFromRenderer(toIntSize(clientBox.location()));
}
bool clientBoxOffsetChanged = oldScrollingLayerOffset != m_scrollingLayer->offsetFromRenderer();
IntSize scrollSize(renderBox->scrollWidth(), renderBox->scrollHeight());
if (scrollSize != m_scrollingContentsLayer->size() || clientBoxOffsetChanged)
m_scrollingContentsLayer->setNeedsDisplay();
IntSize scrollingContentsOffset = toIntSize(clientBox.location() - adjustedScrollOffset);
if (scrollingContentsOffset != m_scrollingContentsLayer->offsetFromRenderer() || scrollSize != m_scrollingContentsLayer->size()) {
bool coordinatorHandlesOffset = compositor()->scrollingLayerDidChange(&m_owningLayer);
m_scrollingContentsLayer->setPosition(coordinatorHandlesOffset ? FloatPoint() : FloatPoint(-adjustedScrollOffset));
}
m_scrollingContentsLayer->setSize(scrollSize);
// FIXME: The paint offset and the scroll offset should really be separate concepts.
m_scrollingContentsLayer->setOffsetFromRenderer(scrollingContentsOffset, GraphicsLayer::DontSetNeedsDisplay);
if (m_foregroundLayer) {
if (m_foregroundLayer->size() != m_scrollingContentsLayer->size())
m_foregroundLayer->setSize(m_scrollingContentsLayer->size());
m_foregroundLayer->setNeedsDisplay();
m_foregroundLayer->setOffsetFromRenderer(m_scrollingContentsLayer->offsetFromRenderer());
}
updateScrollingBlockSelection();
}
void CompositedLayerMapping::updateChildClippingMaskLayerGeometry()
{
if (!m_childClippingMaskLayer || !renderer()->style()->clipPath())
return;
RenderBox* renderBox = toRenderBox(renderer());
IntRect clientBox = enclosingIntRect(renderBox->clientBoxRect());
m_childClippingMaskLayer->setPosition(m_graphicsLayer->position());
m_childClippingMaskLayer->setSize(m_graphicsLayer->size());
m_childClippingMaskLayer->setOffsetFromRenderer(toIntSize(clientBox.location()));
// NOTE: also some stuff happening in updateChildContainmentLayerGeometry().
}
void CompositedLayerMapping::updateForegroundLayerGeometry(const FloatSize& relativeCompositingBoundsSize, const IntRect& clippingBox)
{
if (!m_foregroundLayer)
return;
FloatSize foregroundSize = relativeCompositingBoundsSize;
IntSize foregroundOffset = m_graphicsLayer->offsetFromRenderer();
m_foregroundLayer->setPosition(FloatPoint());
if (hasClippingLayer()) {
// If we have a clipping layer (which clips descendants), then the foreground layer is a child of it,
// so that it gets correctly sorted with children. In that case, position relative to the clipping layer.
foregroundSize = FloatSize(clippingBox.size());
foregroundOffset = toIntSize(clippingBox.location());
} else if (m_childTransformLayer) {
// Things are different if we have a child transform layer rather
// than a clipping layer. In this case, we want to actually change
// the position of the layer (to compensate for our ancestor
// compositing layer's position) rather than leave the position the
// same and use offset-from-renderer + size to describe a clipped
// "window" onto the clipped layer.
m_foregroundLayer->setPosition(-m_childTransformLayer->position());
}
if (foregroundSize != m_foregroundLayer->size()) {
m_foregroundLayer->setSize(foregroundSize);
m_foregroundLayer->setNeedsDisplay();
}
m_foregroundLayer->setOffsetFromRenderer(foregroundOffset);
// NOTE: there is some more configuring going on in updateScrollingLayerGeometry().
}
void CompositedLayerMapping::updateBackgroundLayerGeometry(const FloatSize& relativeCompositingBoundsSize)
{
if (!m_backgroundLayer)
return;
FloatSize backgroundSize = relativeCompositingBoundsSize;
if (backgroundLayerPaintsFixedRootBackground()) {
FrameView* frameView = toRenderView(renderer())->frameView();
backgroundSize = frameView->visibleContentRect().size();
}
m_backgroundLayer->setPosition(FloatPoint());
if (backgroundSize != m_backgroundLayer->size()) {
m_backgroundLayer->setSize(backgroundSize);
m_backgroundLayer->setNeedsDisplay();
}
m_backgroundLayer->setOffsetFromRenderer(m_graphicsLayer->offsetFromRenderer());
}
void CompositedLayerMapping::registerScrollingLayers()
{
// Register fixed position layers and their containers with the scrolling coordinator.
ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer);
if (!scrollingCoordinator)
return;
scrollingCoordinator->updateLayerPositionConstraint(&m_owningLayer);
// Page scale is applied as a transform on the root render view layer. Because the scroll
// layer is further up in the hierarchy, we need to avoid marking the root render view
// layer as a container.
bool isContainer = m_owningLayer.hasTransform() && !m_owningLayer.isRootLayer();
// FIXME: we should make certain that childForSuperLayers will never be the m_squashingContainmentLayer here
scrollingCoordinator->setLayerIsContainerForFixedPositionLayers(localRootForOwningLayer(), isContainer);
}
void CompositedLayerMapping::updateInternalHierarchy()
{
// m_foregroundLayer has to be inserted in the correct order with child layers,
// so it's not inserted here.
if (m_ancestorClippingLayer)
m_ancestorClippingLayer->removeAllChildren();
m_graphicsLayer->removeFromParent();
if (m_ancestorClippingLayer)
m_ancestorClippingLayer->addChild(m_graphicsLayer.get());
if (m_childContainmentLayer)
m_graphicsLayer->addChild(m_childContainmentLayer.get());
else if (m_childTransformLayer)
m_graphicsLayer->addChild(m_childTransformLayer.get());
if (m_scrollingLayer) {
GraphicsLayer* superLayer = m_graphicsLayer.get();
if (m_childContainmentLayer)
superLayer = m_childContainmentLayer.get();
if (m_childTransformLayer)
superLayer = m_childTransformLayer.get();
superLayer->addChild(m_scrollingLayer.get());
}
// The clip for child layers does not include space for overflow controls, so they exist as
// siblings of the clipping layer if we have one. Normal children of this layer are set as
// children of the clipping layer.
if (m_layerForHorizontalScrollbar)
m_graphicsLayer->addChild(m_layerForHorizontalScrollbar.get());
if (m_layerForVerticalScrollbar)
m_graphicsLayer->addChild(m_layerForVerticalScrollbar.get());
if (m_layerForScrollCorner)
m_graphicsLayer->addChild(m_layerForScrollCorner.get());
// The squashing containment layer, if it exists, becomes a no-op parent.
if (m_squashingLayer) {
ASSERT(compositor()->layerSquashingEnabled());
ASSERT((m_ancestorClippingLayer && !m_squashingContainmentLayer) || (!m_ancestorClippingLayer && m_squashingContainmentLayer));
if (m_squashingContainmentLayer) {
m_squashingContainmentLayer->removeAllChildren();
m_squashingContainmentLayer->addChild(m_graphicsLayer.get());
m_squashingContainmentLayer->addChild(m_squashingLayer.get());
} else {
// The ancestor clipping layer is already set up and has m_graphicsLayer under it.
m_ancestorClippingLayer->addChild(m_squashingLayer.get());
}
}
}
void CompositedLayerMapping::updatePaintingPhases()
{
m_graphicsLayer->setPaintingPhase(paintingPhaseForPrimaryLayer());
if (m_scrollingContentsLayer) {
GraphicsLayerPaintingPhase paintPhase = GraphicsLayerPaintOverflowContents | GraphicsLayerPaintCompositedScroll;
if (!m_foregroundLayer)
paintPhase |= GraphicsLayerPaintForeground;
m_scrollingContentsLayer->setPaintingPhase(paintPhase);
m_scrollingBlockSelectionLayer->setPaintingPhase(paintPhase);
}
}
void CompositedLayerMapping::updateContentsRect()
{
m_graphicsLayer->setContentsRect(pixelSnappedIntRect(contentsBox()));
}
void CompositedLayerMapping::updateScrollingBlockSelection()
{
if (!m_scrollingBlockSelectionLayer)
return;
if (!m_scrollingContentsAreEmpty) {
// In this case, the selection will be painted directly into m_scrollingContentsLayer.
m_scrollingBlockSelectionLayer->setDrawsContent(false);
return;
}
const IntRect blockSelectionGapsBounds = m_owningLayer.blockSelectionGapsBounds();
const bool shouldDrawContent = !blockSelectionGapsBounds.isEmpty();
m_scrollingBlockSelectionLayer->setDrawsContent(shouldDrawContent);
if (!shouldDrawContent)
return;
const IntPoint position = blockSelectionGapsBounds.location() + m_owningLayer.scrollableArea()->adjustedScrollOffset();
if (m_scrollingBlockSelectionLayer->size() == blockSelectionGapsBounds.size() && m_scrollingBlockSelectionLayer->position() == position)
return;
m_scrollingBlockSelectionLayer->setPosition(position);
m_scrollingBlockSelectionLayer->setSize(blockSelectionGapsBounds.size());
m_scrollingBlockSelectionLayer->setOffsetFromRenderer(toIntSize(blockSelectionGapsBounds.location()), GraphicsLayer::SetNeedsDisplay);
}
void CompositedLayerMapping::updateDrawsContent()
{
if (m_scrollingLayer) {
// We don't have to consider overflow controls, because we know that the scrollbars are drawn elsewhere.
// m_graphicsLayer only needs backing store if the non-scrolling parts (background, outlines, borders, shadows etc) need to paint.
// m_scrollingLayer never has backing store.
// m_scrollingContentsLayer only needs backing store if the scrolled contents need to paint.
bool hasNonScrollingPaintedContent = m_owningLayer.hasVisibleContent() && m_owningLayer.hasBoxDecorationsOrBackground();
m_graphicsLayer->setDrawsContent(hasNonScrollingPaintedContent);
m_scrollingContentsAreEmpty = !m_owningLayer.hasVisibleContent() || !(renderer()->hasBackground() || paintsChildren());
m_scrollingContentsLayer->setDrawsContent(!m_scrollingContentsAreEmpty);
updateScrollingBlockSelection();
return;
}
bool hasPaintedContent = containsPaintedContent();
if (hasPaintedContent && isAcceleratedCanvas(renderer())) {
CanvasRenderingContext* context = toHTMLCanvasElement(renderer()->node())->renderingContext();
// Content layer may be null if context is lost.
if (blink::WebLayer* contentLayer = context->platformLayer()) {
Color bgColor(Color::transparent);
if (contentLayerSupportsDirectBackgroundComposition(renderer())) {
bgColor = rendererBackgroundColor();
hasPaintedContent = false;
}
contentLayer->setBackgroundColor(bgColor.rgb());
}
}
// FIXME: we could refine this to only allocate backings for one of these layers if possible.
m_graphicsLayer->setDrawsContent(hasPaintedContent);
if (m_foregroundLayer)
m_foregroundLayer->setDrawsContent(hasPaintedContent);
if (m_backgroundLayer)
m_backgroundLayer->setDrawsContent(hasPaintedContent);
}
void CompositedLayerMapping::updateChildrenTransform()
{
if (GraphicsLayer* childTransformLayer = layerForChildrenTransform()) {
childTransformLayer->setTransform(owningLayer().perspectiveTransform());
childTransformLayer->setTransformOrigin(FloatPoint3D(childTransformLayer->size().width() * 0.5f, childTransformLayer->size().height() * 0.5f, 0.f));
bool hasPerspective = false;
if (RenderStyle* style = m_owningLayer.renderer()->style())
hasPerspective = style->hasPerspective();
if (hasPerspective)
childTransformLayer->setShouldFlattenTransform(false);
// Note, if the target is the scrolling layer, we need to ensure that the
// scrolling content layer doesn't flatten the transform. (It would be nice
// if we could apply transform to the scrolling content layer, but that's
// too late, we need the children transform to be applied _before_ the
// scrolling offset.)
if (childTransformLayer == m_scrollingLayer.get())
m_scrollingContentsLayer->setShouldFlattenTransform(false);
}
}
// Return true if the layers changed.
bool CompositedLayerMapping::updateClippingLayers(bool needsAncestorClip, bool needsDescendantClip)
{
bool layersChanged = false;
if (needsAncestorClip) {
if (!m_ancestorClippingLayer) {
m_ancestorClippingLayer = createGraphicsLayer(CompositingReasonLayerForAncestorClip);
m_ancestorClippingLayer->setMasksToBounds(true);
layersChanged = true;
}
} else if (m_ancestorClippingLayer) {
m_ancestorClippingLayer->removeFromParent();
m_ancestorClippingLayer = nullptr;
layersChanged = true;
}
if (needsDescendantClip) {
// We don't need a child containment layer if we're the main frame render view
// layer. It's redundant as the frame clip above us will handle this clipping.
if (!m_childContainmentLayer && !m_isMainFrameRenderViewLayer) {
m_childContainmentLayer = createGraphicsLayer(CompositingReasonLayerForDescendantClip);
m_childContainmentLayer->setMasksToBounds(true);
layersChanged = true;
}
} else if (hasClippingLayer()) {
m_childContainmentLayer->removeFromParent();
m_childContainmentLayer = nullptr;
layersChanged = true;
}
return layersChanged;
}
bool CompositedLayerMapping::updateChildTransformLayer(bool needsChildTransformLayer)
{
bool layersChanged = false;
if (needsChildTransformLayer) {
if (!m_childTransformLayer) {
m_childTransformLayer = createGraphicsLayer(CompositingReasonLayerForPerspective);
m_childTransformLayer->setDrawsContent(false);
m_childTransformLayer->setShouldFlattenTransform(false);
layersChanged = true;
}
} else if (m_childTransformLayer) {
m_childTransformLayer->removeFromParent();
m_childTransformLayer = nullptr;
layersChanged = true;
}
return layersChanged;
}
void CompositedLayerMapping::setBackgroundLayerPaintsFixedRootBackground(bool backgroundLayerPaintsFixedRootBackground)
{
m_backgroundLayerPaintsFixedRootBackground = backgroundLayerPaintsFixedRootBackground;
}
// Only a member function so it can call createGraphicsLayer.
bool CompositedLayerMapping::toggleScrollbarLayerIfNeeded(OwnPtr<GraphicsLayer>& layer, bool needsLayer, CompositingReasons reason)
{
if (needsLayer == !!layer)
return false;
layer = needsLayer ? createGraphicsLayer(reason) : nullptr;
return true;
}
bool CompositedLayerMapping::updateOverflowControlsLayers(bool needsHorizontalScrollbarLayer, bool needsVerticalScrollbarLayer, bool needsScrollCornerLayer)
{
bool horizontalScrollbarLayerChanged = toggleScrollbarLayerIfNeeded(m_layerForHorizontalScrollbar, needsHorizontalScrollbarLayer, CompositingReasonLayerForHorizontalScrollbar);
bool verticalScrollbarLayerChanged = toggleScrollbarLayerIfNeeded(m_layerForVerticalScrollbar, needsVerticalScrollbarLayer, CompositingReasonLayerForVerticalScrollbar);
bool scrollCornerLayerChanged = toggleScrollbarLayerIfNeeded(m_layerForScrollCorner, needsScrollCornerLayer, CompositingReasonLayerForScrollCorner);
if (ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer)) {
if (horizontalScrollbarLayerChanged)
scrollingCoordinator->scrollableAreaScrollbarLayerDidChange(m_owningLayer.scrollableArea(), HorizontalScrollbar);
if (verticalScrollbarLayerChanged)
scrollingCoordinator->scrollableAreaScrollbarLayerDidChange(m_owningLayer.scrollableArea(), VerticalScrollbar);
}
return horizontalScrollbarLayerChanged || verticalScrollbarLayerChanged || scrollCornerLayerChanged;
}
void CompositedLayerMapping::positionOverflowControlsLayers(const IntSize& offsetFromRoot)
{
IntSize offsetFromRenderer = m_graphicsLayer->offsetFromRenderer() - roundedIntSize(m_owningLayer.subpixelAccumulation());
if (GraphicsLayer* layer = layerForHorizontalScrollbar()) {
Scrollbar* hBar = m_owningLayer.scrollableArea()->horizontalScrollbar();
if (hBar) {
layer->setPosition(hBar->frameRect().location() - offsetFromRoot - offsetFromRenderer);
layer->setSize(hBar->frameRect().size());
if (layer->hasContentsLayer())
layer->setContentsRect(IntRect(IntPoint(), hBar->frameRect().size()));
}
layer->setDrawsContent(hBar && !layer->hasContentsLayer());
}
if (GraphicsLayer* layer = layerForVerticalScrollbar()) {
Scrollbar* vBar = m_owningLayer.scrollableArea()->verticalScrollbar();
if (vBar) {
layer->setPosition(vBar->frameRect().location() - offsetFromRoot - offsetFromRenderer);
layer->setSize(vBar->frameRect().size());
if (layer->hasContentsLayer())
layer->setContentsRect(IntRect(IntPoint(), vBar->frameRect().size()));
}
layer->setDrawsContent(vBar && !layer->hasContentsLayer());
}
if (GraphicsLayer* layer = layerForScrollCorner()) {
const LayoutRect& scrollCornerAndResizer = m_owningLayer.scrollableArea()->scrollCornerAndResizerRect();
layer->setPosition(scrollCornerAndResizer.location() - offsetFromRenderer);
layer->setSize(scrollCornerAndResizer.size());
layer->setDrawsContent(!scrollCornerAndResizer.isEmpty());
}
}
bool CompositedLayerMapping::hasUnpositionedOverflowControlsLayers() const
{
if (GraphicsLayer* layer = layerForHorizontalScrollbar()) {
if (!layer->drawsContent())
return true;
}
if (GraphicsLayer* layer = layerForVerticalScrollbar()) {
if (!layer->drawsContent())
return true;
}
if (GraphicsLayer* layer = layerForScrollCorner()) {
if (!layer->drawsContent())
return true;
}
return false;
}
enum ApplyToGraphicsLayersModeFlags {
ApplyToCoreLayers = (1 << 0),
ApplyToSquashingLayer = (1 << 1),
ApplyToScrollbarLayers = (1 << 2),
ApplyToBackgroundLayer = (1 << 3),
ApplyToMaskLayers = (1 << 4),
ApplyToContentLayers = (1 << 5),
ApplyToAllGraphicsLayers = (ApplyToSquashingLayer | ApplyToScrollbarLayers | ApplyToBackgroundLayer | ApplyToMaskLayers | ApplyToCoreLayers | ApplyToContentLayers)
};
typedef unsigned ApplyToGraphicsLayersMode;
template <typename Func>
static void ApplyToGraphicsLayers(const CompositedLayerMapping* mapping, const Func& f, ApplyToGraphicsLayersMode mode)
{
ASSERT(mode);
if ((mode & ApplyToCoreLayers) && mapping->squashingContainmentLayer())
f(mapping->squashingContainmentLayer());
if ((mode & ApplyToCoreLayers) && mapping->childTransformLayer())
f(mapping->childTransformLayer());
if ((mode & ApplyToCoreLayers) && mapping->ancestorClippingLayer())
f(mapping->ancestorClippingLayer());
if (((mode & ApplyToCoreLayers) || (mode & ApplyToContentLayers)) && mapping->mainGraphicsLayer())
f(mapping->mainGraphicsLayer());
if ((mode & ApplyToCoreLayers) && mapping->clippingLayer())
f(mapping->clippingLayer());
if ((mode & ApplyToCoreLayers) && mapping->scrollingLayer())
f(mapping->scrollingLayer());
if (((mode & ApplyToCoreLayers) || (mode & ApplyToContentLayers)) && mapping->scrollingContentsLayer())
f(mapping->scrollingContentsLayer());
if (((mode & ApplyToCoreLayers) || (mode & ApplyToContentLayers)) && mapping->foregroundLayer())
f(mapping->foregroundLayer());
if ((mode & ApplyToSquashingLayer) && mapping->squashingLayer())
f(mapping->squashingLayer());
if (((mode & ApplyToMaskLayers) || (mode & ApplyToContentLayers)) && mapping->maskLayer())
f(mapping->maskLayer());
if (((mode & ApplyToMaskLayers) || (mode & ApplyToContentLayers)) && mapping->childClippingMaskLayer())
f(mapping->childClippingMaskLayer());
if (((mode & ApplyToBackgroundLayer) || (mode & ApplyToContentLayers)) && mapping->backgroundLayer())
f(mapping->backgroundLayer());
if ((mode & ApplyToScrollbarLayers) && mapping->layerForHorizontalScrollbar())
f(mapping->layerForHorizontalScrollbar());
if ((mode & ApplyToScrollbarLayers) && mapping->layerForVerticalScrollbar())
f(mapping->layerForVerticalScrollbar());
if ((mode & ApplyToScrollbarLayers) && mapping->layerForScrollCorner())
f(mapping->layerForScrollCorner());
}
struct UpdateRenderingContextFunctor {
void operator() (GraphicsLayer* layer) const { layer->setRenderingContext(renderingContext); }
int renderingContext;
};
void CompositedLayerMapping::updateRenderingContext()
{
// All layers but the squashing layer (which contains 'alien' content) should be included in this
// rendering context.
int id = 0;
// NB, it is illegal at this point to query an ancestor's compositing state. Some compositing
// reasons depend on the compositing state of ancestors. So if we want a rendering context id
// for the context root, we cannot ask for the id of its associated WebLayer now; it may not have
// one yet. We could do a second past after doing the compositing updates to get these ids,
// but this would actually be harmful. We do not want to attach any semantic meaning to
// the context id other than the fact that they group a number of layers together for the
// sake of 3d sorting. So instead we will ask the compositor to vend us an arbitrary, but
// consistent id.
if (RenderLayer* root = m_owningLayer.renderingContextRoot()) {
if (Node* node = root->renderer()->node())
id = static_cast<int>(WTF::PtrHash<Node*>::hash(node));
}
UpdateRenderingContextFunctor functor = { id };
ApplyToGraphicsLayersMode mode = ApplyToAllGraphicsLayers & ~ApplyToSquashingLayer;
ApplyToGraphicsLayers<UpdateRenderingContextFunctor>(this, functor, mode);
}
struct UpdateShouldFlattenTransformFunctor {
void operator() (GraphicsLayer* layer) const { layer->setShouldFlattenTransform(shouldFlatten); }
bool shouldFlatten;
};
void CompositedLayerMapping::updateShouldFlattenTransform()
{
// All CLM-managed layers that could affect a descendant layer should update their
// should-flatten-transform value (the other layers' transforms don't matter here).
UpdateShouldFlattenTransformFunctor functor = { !m_owningLayer.shouldPreserve3D() };
ApplyToGraphicsLayersMode mode = ApplyToCoreLayers;
ApplyToGraphicsLayers(this, functor, mode);
}
bool CompositedLayerMapping::updateForegroundLayer(bool needsForegroundLayer)
{
bool layerChanged = false;
if (needsForegroundLayer) {
if (!m_foregroundLayer) {
m_foregroundLayer = createGraphicsLayer(CompositingReasonLayerForForeground);
m_foregroundLayer->setDrawsContent(true);
m_foregroundLayer->setPaintingPhase(GraphicsLayerPaintForeground);
layerChanged = true;
}
} else if (m_foregroundLayer) {
FloatRect repaintRect(FloatPoint(), m_foregroundLayer->size());
m_foregroundLayer->removeFromParent();
m_foregroundLayer = nullptr;
layerChanged = true;
}
return layerChanged;
}
bool CompositedLayerMapping::updateBackgroundLayer(bool needsBackgroundLayer)
{
bool layerChanged = false;
if (needsBackgroundLayer) {
if (!m_backgroundLayer) {
m_backgroundLayer = createGraphicsLayer(CompositingReasonLayerForBackground);
m_backgroundLayer->setDrawsContent(true);
m_backgroundLayer->setTransformOrigin(FloatPoint3D());
m_backgroundLayer->setPaintingPhase(GraphicsLayerPaintBackground);
#if !OS(ANDROID)
m_backgroundLayer->contentLayer()->setDrawCheckerboardForMissingTiles(true);
m_graphicsLayer->contentLayer()->setDrawCheckerboardForMissingTiles(false);
#endif
layerChanged = true;
}
} else {
if (m_backgroundLayer) {
m_backgroundLayer->removeFromParent();
m_backgroundLayer = nullptr;
#if !OS(ANDROID)
m_graphicsLayer->contentLayer()->setDrawCheckerboardForMissingTiles(true);
#endif
layerChanged = true;
}
}
if (layerChanged && !m_owningLayer.renderer()->documentBeingDestroyed())
compositor()->rootFixedBackgroundsChanged();
return layerChanged;
}
bool CompositedLayerMapping::updateMaskLayer(bool needsMaskLayer)
{
bool layerChanged = false;
if (needsMaskLayer) {
if (!m_maskLayer) {
m_maskLayer = createGraphicsLayer(CompositingReasonLayerForMask);
m_maskLayer->setDrawsContent(true);
m_maskLayer->setPaintingPhase(GraphicsLayerPaintMask);
layerChanged = true;
}
} else if (m_maskLayer) {
m_maskLayer = nullptr;
layerChanged = true;
}
return layerChanged;
}
bool CompositedLayerMapping::updateClippingMaskLayers(bool needsChildClippingMaskLayer)
{
bool layerChanged = false;
if (needsChildClippingMaskLayer) {
if (!m_childClippingMaskLayer) {
m_childClippingMaskLayer = createGraphicsLayer(CompositingReasonLayerForClippingMask);
m_childClippingMaskLayer->setDrawsContent(true);
m_childClippingMaskLayer->setPaintingPhase(GraphicsLayerPaintChildClippingMask);
layerChanged = true;
}
} else if (m_childClippingMaskLayer) {
m_childClippingMaskLayer = nullptr;
layerChanged = true;
}
return layerChanged;
}
bool CompositedLayerMapping::updateScrollingLayers(bool needsScrollingLayers)
{
ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer);
bool layerChanged = false;
if (needsScrollingLayers) {
if (!m_scrollingLayer) {
// Outer layer which corresponds with the scroll view.
m_scrollingLayer = createGraphicsLayer(CompositingReasonLayerForScrollingContainer);
m_scrollingLayer->setDrawsContent(false);
m_scrollingLayer->setMasksToBounds(true);
// Inner layer which renders the content that scrolls.
m_scrollingContentsLayer = createGraphicsLayer(CompositingReasonLayerForScrollingContents);
m_scrollingContentsLayer->setDrawsContent(true);
m_scrollingLayer->addChild(m_scrollingContentsLayer.get());
m_scrollingBlockSelectionLayer = createGraphicsLayer(CompositingReasonLayerForScrollingBlockSelection);
m_scrollingBlockSelectionLayer->setDrawsContent(true);
m_scrollingContentsLayer->addChild(m_scrollingBlockSelectionLayer.get());
layerChanged = true;
if (scrollingCoordinator)
scrollingCoordinator->scrollableAreaScrollLayerDidChange(m_owningLayer.scrollableArea());
}
} else if (m_scrollingLayer) {
m_scrollingLayer = nullptr;
m_scrollingContentsLayer = nullptr;
m_scrollingBlockSelectionLayer = nullptr;
layerChanged = true;
if (scrollingCoordinator)
scrollingCoordinator->scrollableAreaScrollLayerDidChange(m_owningLayer.scrollableArea());
}
return layerChanged;
}
static void updateScrollParentForGraphicsLayer(GraphicsLayer* layer, GraphicsLayer* topmostLayer, RenderLayer* scrollParent, ScrollingCoordinator* scrollingCoordinator)
{
if (!layer)
return;
// Only the topmost layer has a scroll parent. All other layers have a null scroll parent.
if (layer != topmostLayer)
scrollParent = 0;
scrollingCoordinator->updateScrollParentForGraphicsLayer(layer, scrollParent);
}
void CompositedLayerMapping::updateScrollParent(RenderLayer* scrollParent)
{
if (ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer)) {
GraphicsLayer* topmostLayer = childForSuperlayers();
updateScrollParentForGraphicsLayer(m_squashingContainmentLayer.get(), topmostLayer, scrollParent, scrollingCoordinator);
updateScrollParentForGraphicsLayer(m_ancestorClippingLayer.get(), topmostLayer, scrollParent, scrollingCoordinator);
updateScrollParentForGraphicsLayer(m_graphicsLayer.get(), topmostLayer, scrollParent, scrollingCoordinator);
}
}
void CompositedLayerMapping::updateClipParent(RenderLayer* clipParent)
{
if (ScrollingCoordinator* scrollingCoordinator = scrollingCoordinatorFromLayer(m_owningLayer))
scrollingCoordinator->updateClipParentForGraphicsLayer(m_graphicsLayer.get(), clipParent);
}
bool CompositedLayerMapping::updateSquashingLayers(bool needsSquashingLayers)
{
bool layersChanged = false;
if (needsSquashingLayers) {
ASSERT(compositor()->layerSquashingEnabled());
if (!m_squashingLayer) {
m_squashingLayer = createGraphicsLayer(CompositingReasonLayerForSquashingContents);
m_squashingLayer->setDrawsContent(true);
layersChanged = true;
}
if (m_ancestorClippingLayer) {
if (m_squashingContainmentLayer) {
m_squashingContainmentLayer->removeFromParent();
m_squashingContainmentLayer = nullptr;
layersChanged = true;
}
} else {
if (!m_squashingContainmentLayer) {
m_squashingContainmentLayer = createGraphicsLayer(CompositingReasonLayerForSquashingContainer);
layersChanged = true;
}
}
ASSERT((m_ancestorClippingLayer && !m_squashingContainmentLayer) || (!m_ancestorClippingLayer && m_squashingContainmentLayer));
ASSERT(m_squashingLayer);
} else {
if (m_squashingLayer) {
m_squashingLayer->removeFromParent();
m_squashingLayer = nullptr;
layersChanged = true;
}
if (m_squashingContainmentLayer) {
m_squashingContainmentLayer->removeFromParent();
m_squashingContainmentLayer = nullptr;
layersChanged = true;
}
ASSERT(!m_squashingLayer && !m_squashingContainmentLayer);
}
return layersChanged;
}
GraphicsLayerPaintingPhase CompositedLayerMapping::paintingPhaseForPrimaryLayer() const
{
unsigned phase = 0;
if (!m_backgroundLayer)
phase |= GraphicsLayerPaintBackground;
if (!m_foregroundLayer)
phase |= GraphicsLayerPaintForeground;
if (!m_maskLayer)
phase |= GraphicsLayerPaintMask;
if (m_scrollingContentsLayer) {
phase &= ~GraphicsLayerPaintForeground;
phase |= GraphicsLayerPaintCompositedScroll;
}
return static_cast<GraphicsLayerPaintingPhase>(phase);
}
float CompositedLayerMapping::compositingOpacity(float rendererOpacity) const
{
float finalOpacity = rendererOpacity;
for (RenderLayer* curr = m_owningLayer.parent(); curr; curr = curr->parent()) {
// We only care about parents that are stacking contexts.
// Recall that opacity creates stacking context.
if (!curr->stackingNode()->isStackingContext())
continue;
// If we found a composited layer, regardless of whether it actually
// paints into it, we want to compute opacity relative to it. So we can
// break here.
//
// FIXME: with grouped backings, a composited descendant will have to
// continue past the grouped (squashed) layers that its parents may
// contribute to. This whole confusion can be avoided by specifying
// explicitly the composited ancestor where we would stop accumulating
// opacity.
if (curr->compositingState() == PaintsIntoOwnBacking || curr->compositingState() == HasOwnBackingButPaintsIntoAncestor)
break;
finalOpacity *= curr->renderer()->opacity();
}
return finalOpacity;
}
Color CompositedLayerMapping::rendererBackgroundColor() const
{
RenderObject* backgroundRenderer = renderer();
if (backgroundRenderer->isDocumentElement())
backgroundRenderer = backgroundRenderer->rendererForRootBackground();
return backgroundRenderer->resolveColor(CSSPropertyBackgroundColor);
}
void CompositedLayerMapping::updateBackgroundColor()
{
m_graphicsLayer->setBackgroundColor(rendererBackgroundColor());
}
bool CompositedLayerMapping::paintsChildren() const
{
if (m_owningLayer.hasVisibleContent() && m_owningLayer.hasNonEmptyChildRenderers())
return true;
if (hasVisibleNonCompositingDescendant(&m_owningLayer))
return true;
return false;
}
static bool isCompositedPlugin(RenderObject* renderer)
{
return renderer->isEmbeddedObject() && toRenderEmbeddedObject(renderer)->requiresAcceleratedCompositing();
}
bool CompositedLayerMapping::hasVisibleNonCompositingDescendant(RenderLayer* parent)
{
if (!parent->hasVisibleDescendant())
return false;
// FIXME: We shouldn't be called with a stale z-order lists. See bug 85512.
parent->stackingNode()->updateLayerListsIfNeeded();
#if ASSERT_ENABLED
LayerListMutationDetector mutationChecker(parent->stackingNode());
#endif
RenderLayerStackingNodeIterator normalFlowIterator(*parent->stackingNode(), AllChildren);
while (RenderLayerStackingNode* curNode = normalFlowIterator.next()) {
RenderLayer* curLayer = curNode->layer();
if (curLayer->hasCompositedLayerMapping())
continue;
if (curLayer->hasVisibleContent() || hasVisibleNonCompositingDescendant(curLayer))
return true;
}
return false;
}
bool CompositedLayerMapping::containsPaintedContent() const
{
if (paintsIntoCompositedAncestor() || m_owningLayer.isReflection())
return false;
if (isDirectlyCompositedImage())
return false;
RenderObject* renderObject = renderer();
// FIXME: we could optimize cases where the image, video or canvas is known to fill the border box entirely,
// and set background color on the layer in that case, instead of allocating backing store and painting.
if (renderObject->isVideo() && toRenderVideo(renderer())->shouldDisplayVideo())
return m_owningLayer.hasBoxDecorationsOrBackground();
if (m_owningLayer.hasVisibleBoxDecorations())
return true;
if (renderObject->hasMask()) // masks require special treatment
return true;
if (renderObject->isReplaced() && !isCompositedPlugin(renderObject))
return true;
if (renderObject->isRenderRegion())
return true;
if (renderObject->node() && renderObject->node()->isDocumentNode()) {
// Look to see if the root object has a non-simple background
RenderObject* rootObject = renderObject->document().documentElement() ? renderObject->document().documentElement()->renderer() : 0;
// Reject anything that has a border, a border-radius or outline,
// or is not a simple background (no background, or solid color).
if (rootObject && hasBoxDecorationsOrBackgroundImage(rootObject->style()))
return true;
// Now look at the body's renderer.
HTMLElement* body = renderObject->document().body();
RenderObject* bodyObject = (body && body->hasLocalName(bodyTag)) ? body->renderer() : 0;
if (bodyObject && hasBoxDecorationsOrBackgroundImage(bodyObject->style()))
return true;
}
// FIXME: it's O(n^2). A better solution is needed.
return paintsChildren();
}
// An image can be directly compositing if it's the sole content of the layer, and has no box decorations
// that require painting. Direct compositing saves backing store.
bool CompositedLayerMapping::isDirectlyCompositedImage() const
{
RenderObject* renderObject = renderer();
if (!renderObject->isImage() || m_owningLayer.hasBoxDecorationsOrBackground() || renderObject->hasClip())
return false;
RenderImage* imageRenderer = toRenderImage(renderObject);
if (ImageResource* cachedImage = imageRenderer->cachedImage()) {
if (!cachedImage->hasImage())
return false;
Image* image = cachedImage->imageForRenderer(imageRenderer);
return image->isBitmapImage();
}
return false;
}
void CompositedLayerMapping::contentChanged(ContentChangeType changeType)
{
if ((changeType == ImageChanged) && isDirectlyCompositedImage()) {
updateImageContents();
return;
}
if ((changeType == CanvasChanged || changeType == CanvasPixelsChanged) && isAcceleratedCanvas(renderer())) {
m_graphicsLayer->setContentsNeedsDisplay();
return;
}
}
void CompositedLayerMapping::updateImageContents()
{
ASSERT(renderer()->isImage());
RenderImage* imageRenderer = toRenderImage(renderer());
ImageResource* cachedImage = imageRenderer->cachedImage();
if (!cachedImage)
return;
Image* image = cachedImage->imageForRenderer(imageRenderer);
if (!image)
return;
// We have to wait until the image is fully loaded before setting it on the layer.
if (!cachedImage->isLoaded())
return;
// This is a no-op if the layer doesn't have an inner layer for the image.
m_graphicsLayer->setContentsToImage(image);
updateDrawsContent();
// Image animation is "lazy", in that it automatically stops unless someone is drawing
// the image. So we have to kick the animation each time; this has the downside that the
// image will keep animating, even if its layer is not visible.
image->startAnimation();
}
FloatPoint3D CompositedLayerMapping::computeTransformOrigin(const IntRect& borderBox) const
{
RenderStyle* style = renderer()->style();
FloatPoint3D origin;
origin.setX(floatValueForLength(style->transformOriginX(), borderBox.width()));
origin.setY(floatValueForLength(style->transformOriginY(), borderBox.height()));
origin.setZ(style->transformOriginZ());
return origin;
}
// Return the offset from the top-left of this compositing layer at which the renderer's contents are painted.
LayoutSize CompositedLayerMapping::contentOffsetInCompositingLayer() const
{
return LayoutSize(-m_compositedBounds.x(), -m_compositedBounds.y());
}
LayoutRect CompositedLayerMapping::contentsBox() const
{
LayoutRect contentsBox = contentsRect(renderer());
contentsBox.move(contentOffsetInCompositingLayer());
return contentsBox;
}
GraphicsLayer* CompositedLayerMapping::parentForSublayers() const
{
if (m_scrollingBlockSelectionLayer)
return m_scrollingBlockSelectionLayer.get();
if (m_scrollingContentsLayer)
return m_scrollingContentsLayer.get();
if (m_childContainmentLayer)
return m_childContainmentLayer.get();
if (m_childTransformLayer)
return m_childTransformLayer.get();
return m_graphicsLayer.get();
}
GraphicsLayer* CompositedLayerMapping::localRootForOwningLayer() const
{
if (m_ancestorClippingLayer)
return m_ancestorClippingLayer.get();
return m_graphicsLayer.get();
}
GraphicsLayer* CompositedLayerMapping::childForSuperlayers() const
{
if (m_squashingContainmentLayer)
return m_squashingContainmentLayer.get();
return localRootForOwningLayer();
}
GraphicsLayer* CompositedLayerMapping::layerForChildrenTransform() const
{
if (GraphicsLayer* clipLayer = clippingLayer())
return clipLayer;
if (m_scrollingLayer)
return m_scrollingLayer.get();
return m_childTransformLayer.get();
}
bool CompositedLayerMapping::updateRequiresOwnBackingStoreForAncestorReasons(const RenderLayer* compositingAncestorLayer)
{
unsigned previousRequiresOwnBackingStoreForAncestorReasons = m_requiresOwnBackingStoreForAncestorReasons;
bool previousPaintsIntoCompositedAncestor = paintsIntoCompositedAncestor();
bool canPaintIntoAncestor = compositingAncestorLayer
&& (compositingAncestorLayer->compositedLayerMapping()->mainGraphicsLayer()->drawsContent()
|| compositingAncestorLayer->compositedLayerMapping()->paintsIntoCompositedAncestor());
m_requiresOwnBackingStoreForAncestorReasons = !canPaintIntoAncestor;
if (paintsIntoCompositedAncestor() != previousPaintsIntoCompositedAncestor)
paintsIntoCompositedAncestorChanged();
return m_requiresOwnBackingStoreForAncestorReasons != previousRequiresOwnBackingStoreForAncestorReasons;
}
bool CompositedLayerMapping::updateRequiresOwnBackingStoreForIntrinsicReasons()
{
unsigned previousRequiresOwnBackingStoreForIntrinsicReasons = m_requiresOwnBackingStoreForIntrinsicReasons;
bool previousPaintsIntoCompositedAncestor = paintsIntoCompositedAncestor();
RenderObject* renderer = m_owningLayer.renderer();
m_requiresOwnBackingStoreForIntrinsicReasons = m_owningLayer.isRootLayer()
|| (m_owningLayer.compositingReasons() & CompositingReasonComboReasonsThatRequireOwnBacking)
|| m_owningLayer.transform()
|| m_owningLayer.clipsCompositingDescendantsWithBorderRadius() // FIXME: Revisit this if the paintsIntoCompositedAncestor state is removed.
|| renderer->isTransparent()
|| renderer->hasMask()
|| renderer->hasReflection()
|| renderer->hasFilter();
if (paintsIntoCompositedAncestor() != previousPaintsIntoCompositedAncestor)
paintsIntoCompositedAncestorChanged();
return m_requiresOwnBackingStoreForIntrinsicReasons != previousRequiresOwnBackingStoreForIntrinsicReasons;
}
void CompositedLayerMapping::paintsIntoCompositedAncestorChanged()
{
// The answer to paintsIntoCompositedAncestor() affects cached clip rects, so when
// it changes we have to clear clip rects on descendants.
m_owningLayer.clipper().clearClipRectsIncludingDescendants(PaintingClipRects);
m_owningLayer.repainter().computeRepaintRectsIncludingNonCompositingDescendants();
compositor()->repaintInCompositedAncestor(&m_owningLayer, compositedBounds());
}
void CompositedLayerMapping::setBlendMode(blink::WebBlendMode blendMode)
{
if (m_ancestorClippingLayer) {
m_ancestorClippingLayer->setBlendMode(blendMode);
m_graphicsLayer->setBlendMode(blink::WebBlendModeNormal);
} else {
m_graphicsLayer->setBlendMode(blendMode);
}
}
GraphicsLayerUpdater::UpdateType CompositedLayerMapping::updateTypeForChildren(GraphicsLayerUpdater::UpdateType updateType) const
{
if (m_pendingUpdateScope >= GraphicsLayerUpdateSubtree)
return GraphicsLayerUpdater::ForceUpdate;
return updateType;
}
struct SetContentsNeedsDisplayFunctor {
void operator() (GraphicsLayer* layer) const
{
if (layer->drawsContent())
layer->setNeedsDisplay();
}
};
void CompositedLayerMapping::setSquashingContentsNeedDisplay()
{
ApplyToGraphicsLayers(this, SetContentsNeedsDisplayFunctor(), ApplyToSquashingLayer);
}
void CompositedLayerMapping::setContentsNeedDisplay()
{
// FIXME: need to split out repaints for the background.
ASSERT(!paintsIntoCompositedAncestor());
ApplyToGraphicsLayers(this, SetContentsNeedsDisplayFunctor(), ApplyToContentLayers);
}
struct SetContentsNeedsDisplayInRectFunctor {
void operator() (GraphicsLayer* layer) const
{
if (layer->drawsContent()) {
IntRect layerDirtyRect = r;
layerDirtyRect.move(-layer->offsetFromRenderer());
layer->setNeedsDisplayInRect(layerDirtyRect);
}
}
IntRect r;
};
// r is in the coordinate space of the layer's render object
void CompositedLayerMapping::setContentsNeedDisplayInRect(const IntRect& r)
{
// FIXME: need to split out repaints for the background.
ASSERT(!paintsIntoCompositedAncestor());
SetContentsNeedsDisplayInRectFunctor functor = { r };
ApplyToGraphicsLayers(this, functor, ApplyToContentLayers);
}
const GraphicsLayerPaintInfo* CompositedLayerMapping::containingSquashedLayer(const RenderObject* renderObject, const Vector<GraphicsLayerPaintInfo>& layers)
{
for (size_t i = 0; i < layers.size(); ++i) {
if (renderObject->isDescendantOf(layers[i].renderLayer->renderer())) {
return &layers[i];
break;
}
}
return 0;
}
const GraphicsLayerPaintInfo* CompositedLayerMapping::containingSquashedLayer(const RenderObject* renderObject)
{
return CompositedLayerMapping::containingSquashedLayer(renderObject, m_squashedLayers);
}
IntRect CompositedLayerMapping::localClipRectForSquashedLayer(const RenderLayer& referenceLayer, const GraphicsLayerPaintInfo& paintInfo, const Vector<GraphicsLayerPaintInfo>& layers)
{
const RenderObject* clippingContainer = paintInfo.renderLayer->renderer()->clippingContainer();
if (clippingContainer == referenceLayer.renderer()->clippingContainer())
return PaintInfo::infiniteRect();
ASSERT(clippingContainer);
const GraphicsLayerPaintInfo* ancestorPaintInfo = containingSquashedLayer(clippingContainer, layers);
// Must be there, otherwise CompositingLayerAssigner::canSquashIntoCurrentSquashingOwner would have disallowed squashing.
ASSERT(ancestorPaintInfo);
// FIXME: this is a potential performance issue. We shoudl consider caching these clip rects or otherwise optimizing.
ClipRectsContext clipRectsContext(ancestorPaintInfo->renderLayer, TemporaryClipRects);
IntRect parentClipRect = pixelSnappedIntRect(paintInfo.renderLayer->clipper().backgroundClipRect(clipRectsContext).rect());
ASSERT(parentClipRect != PaintInfo::infiniteRect());
// Convert from ancestor to local coordinates.
IntSize ancestorToLocalOffset = paintInfo.offsetFromRenderer - ancestorPaintInfo->offsetFromRenderer;
parentClipRect.move(ancestorToLocalOffset);
return parentClipRect;
}
void CompositedLayerMapping::doPaintTask(GraphicsLayerPaintInfo& paintInfo, GraphicsContext* context,
const IntRect& clip) // In the coords of rootLayer.
{
if (paintsIntoCompositedAncestor()) {
ASSERT_NOT_REACHED();
return;
}
FontCachePurgePreventer fontCachePurgePreventer;
PaintLayerFlags paintFlags = 0;
if (paintInfo.paintingPhase & GraphicsLayerPaintBackground)
paintFlags |= PaintLayerPaintingCompositingBackgroundPhase;
if (paintInfo.paintingPhase & GraphicsLayerPaintForeground)
paintFlags |= PaintLayerPaintingCompositingForegroundPhase;
if (paintInfo.paintingPhase & GraphicsLayerPaintMask)
paintFlags |= PaintLayerPaintingCompositingMaskPhase;
if (paintInfo.paintingPhase & GraphicsLayerPaintChildClippingMask)
paintFlags |= PaintLayerPaintingChildClippingMaskPhase;
if (paintInfo.paintingPhase & GraphicsLayerPaintOverflowContents)
paintFlags |= PaintLayerPaintingOverflowContents;
if (paintInfo.paintingPhase & GraphicsLayerPaintCompositedScroll)
paintFlags |= PaintLayerPaintingCompositingScrollingPhase;
if (paintInfo.isBackgroundLayer)
paintFlags |= (PaintLayerPaintingRootBackgroundOnly | PaintLayerPaintingCompositingForegroundPhase); // Need PaintLayerPaintingCompositingForegroundPhase to walk child layers.
else if (compositor()->fixedRootBackgroundLayer())
paintFlags |= PaintLayerPaintingSkipRootBackground;
// Note carefully: in theory it is appropriate to invoke context->save() here
// and restore the context after painting. For efficiency, we are assuming that
// it is equivalent to manually undo this offset translation, which means we are
// assuming that the context's space was not affected by the RenderLayer
// painting code.
IntSize offset = paintInfo.offsetFromRenderer;
context->translate(-offset.width(), -offset.height());
// The dirtyRect is in the coords of the painting root.
IntRect dirtyRect(clip);
dirtyRect.move(offset);
if (!(paintInfo.paintingPhase & GraphicsLayerPaintOverflowContents)) {
LayoutRect bounds = paintInfo.compositedBounds;
bounds.move(paintInfo.renderLayer->subpixelAccumulation());
dirtyRect.intersect(pixelSnappedIntRect(bounds));
} else {
dirtyRect.move(roundedIntSize(paintInfo.renderLayer->subpixelAccumulation()));
}
#ifndef NDEBUG
paintInfo.renderLayer->renderer()->assertSubtreeIsLaidOut();
#endif
if (paintInfo.renderLayer->compositingState() != PaintsIntoGroupedBacking) {
// FIXME: GraphicsLayers need a way to split for RenderRegions.
LayerPaintingInfo paintingInfo(paintInfo.renderLayer, dirtyRect, PaintBehaviorNormal, paintInfo.renderLayer->subpixelAccumulation());
paintInfo.renderLayer->paintLayerContents(context, paintingInfo, paintFlags);
ASSERT(!paintInfo.isBackgroundLayer || paintFlags & PaintLayerPaintingRootBackgroundOnly);
if (paintInfo.renderLayer->containsDirtyOverlayScrollbars())
paintInfo.renderLayer->paintLayerContents(context, paintingInfo, paintFlags | PaintLayerPaintingOverlayScrollbars);
} else {
ASSERT(compositor()->layerSquashingEnabled());
LayerPaintingInfo paintingInfo(paintInfo.renderLayer, dirtyRect, PaintBehaviorNormal, paintInfo.renderLayer->subpixelAccumulation());
// RenderLayer::paintLayer assumes that the caller clips to the passed rect. Squashed layers need to do this clipping in software,
// since there is no graphics layer to clip them precisely. Furthermore, in some cases we squash layers that need clipping in software
// from clipping ancestors (see CompositedLayerMapping::localClipRectForSquashedLayer()).
context->save();
dirtyRect.intersect(paintInfo.localClipRectForSquashedLayer);
context->clip(dirtyRect);
paintInfo.renderLayer->paintLayer(context, paintingInfo, paintFlags);
context->restore();
}
ASSERT(!paintInfo.renderLayer->usedTransparency());
// Manually restore the context to its original state by applying the opposite translation.
context->translate(offset.width(), offset.height());
}
static void paintScrollbar(Scrollbar* scrollbar, GraphicsContext& context, const IntRect& clip)
{
if (!scrollbar)
return;
context.save();
const IntRect& scrollbarRect = scrollbar->frameRect();
context.translate(-scrollbarRect.x(), -scrollbarRect.y());
IntRect transformedClip = clip;
transformedClip.moveBy(scrollbarRect.location());
scrollbar->paint(&context, transformedClip);
context.restore();
}
// Up-call from compositing layer drawing callback.
void CompositedLayerMapping::paintContents(const GraphicsLayer* graphicsLayer, GraphicsContext& context, GraphicsLayerPaintingPhase paintingPhase, const IntRect& clip)
{
// https://code.google.com/p/chromium/issues/detail?id=343772
DisableCompositingQueryAsserts disabler;
#ifndef NDEBUG
// FIXME: once the state machine is ready, this can be removed and we can refer to that instead.
if (Page* page = renderer()->frame()->page())
page->setIsPainting(true);
#endif
TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "Paint", "data", InspectorPaintEvent::data(m_owningLayer.renderer(), clip, graphicsLayer));
TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.stack"), "CallStack", "stack", InspectorCallStackEvent::currentCallStack());
// FIXME(361045): remove InspectorInstrumentation calls once DevTools Timeline migrates to tracing.
InspectorInstrumentation::willPaint(m_owningLayer.renderer(), graphicsLayer);
if (graphicsLayer == m_graphicsLayer.get()
|| graphicsLayer == m_foregroundLayer.get()
|| graphicsLayer == m_backgroundLayer.get()
|| graphicsLayer == m_maskLayer.get()
|| graphicsLayer == m_childClippingMaskLayer.get()
|| graphicsLayer == m_scrollingContentsLayer.get()
|| graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
GraphicsLayerPaintInfo paintInfo;
paintInfo.renderLayer = &m_owningLayer;
paintInfo.compositedBounds = compositedBounds();
paintInfo.offsetFromRenderer = graphicsLayer->offsetFromRenderer();
paintInfo.paintingPhase = paintingPhase;
paintInfo.isBackgroundLayer = (graphicsLayer == m_backgroundLayer);
// We have to use the same root as for hit testing, because both methods can compute and cache clipRects.
doPaintTask(paintInfo, &context, clip);
} else if (graphicsLayer == m_squashingLayer.get()) {
ASSERT(compositor()->layerSquashingEnabled());
for (size_t i = 0; i < m_squashedLayers.size(); ++i)
doPaintTask(m_squashedLayers[i], &context, clip);
} else if (graphicsLayer == layerForHorizontalScrollbar()) {
paintScrollbar(m_owningLayer.scrollableArea()->horizontalScrollbar(), context, clip);
} else if (graphicsLayer == layerForVerticalScrollbar()) {
paintScrollbar(m_owningLayer.scrollableArea()->verticalScrollbar(), context, clip);
} else if (graphicsLayer == layerForScrollCorner()) {
const IntRect& scrollCornerAndResizer = m_owningLayer.scrollableArea()->scrollCornerAndResizerRect();
context.save();
context.translate(-scrollCornerAndResizer.x(), -scrollCornerAndResizer.y());
IntRect transformedClip = clip;
transformedClip.moveBy(scrollCornerAndResizer.location());
m_owningLayer.scrollableArea()->paintScrollCorner(&context, IntPoint(), transformedClip);
m_owningLayer.scrollableArea()->paintResizer(&context, IntPoint(), transformedClip);
context.restore();
}
InspectorInstrumentation::didPaint(m_owningLayer.renderer(), graphicsLayer, &context, clip);
#ifndef NDEBUG
if (Page* page = renderer()->frame()->page())
page->setIsPainting(false);
#endif
}
bool CompositedLayerMapping::isTrackingRepaints() const
{
GraphicsLayerClient* client = compositor();
return client ? client->isTrackingRepaints() : false;
}
struct CollectTrackedRepaintRectsFunctor {
void operator() (GraphicsLayer* layer) const { layer->collectTrackedRepaintRects(*rects); }
Vector<FloatRect>* rects;
};
PassOwnPtr<Vector<FloatRect> > CompositedLayerMapping::collectTrackedRepaintRects() const
{
OwnPtr<Vector<FloatRect> > rects = adoptPtr(new Vector<FloatRect>);
CollectTrackedRepaintRectsFunctor functor = { rects.get() };
ApplyToGraphicsLayers(this, functor, ApplyToAllGraphicsLayers);
return rects.release();
}
#ifndef NDEBUG
void CompositedLayerMapping::verifyNotPainting()
{
ASSERT(!renderer()->frame()->page() || !renderer()->frame()->page()->isPainting());
}
#endif
void CompositedLayerMapping::notifyAnimationStarted(const GraphicsLayer*, double monotonicTime)
{
renderer()->node()->document().compositorPendingAnimations().notifyCompositorAnimationStarted(monotonicTime);
}
IntRect CompositedLayerMapping::pixelSnappedCompositedBounds() const
{
LayoutRect bounds = m_compositedBounds;
bounds.move(m_owningLayer.subpixelAccumulation());
return pixelSnappedIntRect(bounds);
}
bool CompositedLayerMapping::updateSquashingLayerAssignment(RenderLayer* squashedLayer, const RenderLayer& owningLayer, size_t nextSquashedLayerIndex)
{
ASSERT(compositor()->layerSquashingEnabled());
GraphicsLayerPaintInfo paintInfo;
paintInfo.renderLayer = squashedLayer;
// NOTE: composited bounds are updated elsewhere
// NOTE: offsetFromRenderer is updated elsewhere
paintInfo.paintingPhase = GraphicsLayerPaintAllWithOverflowClip;
paintInfo.isBackgroundLayer = false;
// Change tracking on squashing layers: at the first sign of something changed, just invalidate the layer.
// FIXME: Perhaps we can find a tighter more clever mechanism later.
bool updatedAssignment = false;
if (nextSquashedLayerIndex < m_squashedLayers.size()) {
if (!paintInfo.isEquivalentForSquashing(m_squashedLayers[nextSquashedLayerIndex])) {
compositor()->repaintOnCompositingChange(squashedLayer);
updatedAssignment = true;
m_squashedLayers[nextSquashedLayerIndex] = paintInfo;
}
} else {
compositor()->repaintOnCompositingChange(squashedLayer);
m_squashedLayers.append(paintInfo);
updatedAssignment = true;
}
squashedLayer->setGroupedMapping(this);
return updatedAssignment;
}
void CompositedLayerMapping::removeRenderLayerFromSquashingGraphicsLayer(const RenderLayer* layer)
{
size_t layerIndex = kNotFound;
for (size_t i = 0; i < m_squashedLayers.size(); ++i) {
if (m_squashedLayers[i].renderLayer == layer) {
layerIndex = i;
break;
}
}
if (layerIndex == kNotFound)
return;
m_squashedLayers.remove(layerIndex);
}
void CompositedLayerMapping::finishAccumulatingSquashingLayers(size_t nextSquashedLayerIndex)
{
ASSERT(compositor()->layerSquashingEnabled());
// Any additional squashed RenderLayers in the array no longer exist, and removing invalidates the squashingLayer contents.
if (nextSquashedLayerIndex < m_squashedLayers.size())
m_squashedLayers.remove(nextSquashedLayerIndex, m_squashedLayers.size() - nextSquashedLayerIndex);
}
String CompositedLayerMapping::debugName(const GraphicsLayer* graphicsLayer)
{
String name;
if (graphicsLayer == m_graphicsLayer.get()) {
name = m_owningLayer.debugName();
} else if (graphicsLayer == m_squashingContainmentLayer.get()) {
name = "Squashing Containment Layer";
} else if (graphicsLayer == m_squashingLayer.get()) {
name = "Squashing Layer";
} else if (graphicsLayer == m_ancestorClippingLayer.get()) {
name = "Ancestor Clipping Layer";
} else if (graphicsLayer == m_foregroundLayer.get()) {
name = m_owningLayer.debugName() + " (foreground) Layer";
} else if (graphicsLayer == m_backgroundLayer.get()) {
name = m_owningLayer.debugName() + " (background) Layer";
} else if (graphicsLayer == m_childContainmentLayer.get()) {
name = "Child Containment Layer";
} else if (graphicsLayer == m_childTransformLayer.get()) {
name = "Child Transform Layer";
} else if (graphicsLayer == m_maskLayer.get()) {
name = "Mask Layer";
} else if (graphicsLayer == m_childClippingMaskLayer.get()) {
name = "Child Clipping Mask Layer";
} else if (graphicsLayer == m_layerForHorizontalScrollbar.get()) {
name = "Horizontal Scrollbar Layer";
} else if (graphicsLayer == m_layerForVerticalScrollbar.get()) {
name = "Vertical Scrollbar Layer";
} else if (graphicsLayer == m_layerForScrollCorner.get()) {
name = "Scroll Corner Layer";
} else if (graphicsLayer == m_scrollingLayer.get()) {
name = "Scrolling Layer";
} else if (graphicsLayer == m_scrollingContentsLayer.get()) {
name = "Scrolling Contents Layer";
} else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
name = "Scrolling Block Selection Layer";
} else {
ASSERT_NOT_REACHED();
}
return name;
}
} // namespace WebCore