RenderLayerCompositor.cpp [plain text]
#include "config.h"
#if USE(ACCELERATED_COMPOSITING)
#include "RenderLayerCompositor.h"
#include "AnimationController.h"
#include "CanvasRenderingContext.h"
#include "CSSPropertyNames.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsLayer.h"
#include "HTMLCanvasElement.h"
#include "HTMLIFrameElement.h"
#include "HTMLNames.h"
#include "HitTestResult.h"
#include "NodeList.h"
#include "Page.h"
#include "RenderApplet.h"
#include "RenderEmbeddedObject.h"
#include "RenderFullScreen.h"
#include "RenderIFrame.h"
#include "RenderLayerBacking.h"
#include "RenderReplica.h"
#include "RenderVideo.h"
#include "RenderView.h"
#include "Settings.h"
#if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
#include "HTMLMediaElement.h"
#endif
#if PROFILE_LAYER_REBUILD
#include <wtf/CurrentTime.h>
#endif
#ifndef NDEBUG
#include "RenderTreeAsText.h"
#endif
#if ENABLE(3D_RENDERING)
bool WebCoreHas3DRendering = true;
#endif
namespace WebCore {
using namespace HTMLNames;
struct CompositingState {
CompositingState(RenderLayer* compAncestor)
: m_compositingAncestor(compAncestor)
, m_subtreeIsCompositing(false)
#ifndef NDEBUG
, m_depth(0)
#endif
{
}
RenderLayer* m_compositingAncestor;
bool m_subtreeIsCompositing;
#ifndef NDEBUG
int m_depth;
#endif
};
RenderLayerCompositor::RenderLayerCompositor(RenderView* renderView)
: m_renderView(renderView)
, m_updateCompositingLayersTimer(this, &RenderLayerCompositor::updateCompositingLayersTimerFired)
, m_hasAcceleratedCompositing(true)
, m_compositingTriggers(static_cast<ChromeClient::CompositingTriggerFlags>(ChromeClient::AllTriggers))
, m_showDebugBorders(false)
, m_showRepaintCounter(false)
, m_compositingConsultsOverlap(true)
, m_compositingDependsOnGeometry(false)
, m_compositing(false)
, m_compositingLayersNeedRebuild(false)
, m_flushingLayers(false)
, m_forceCompositingMode(false)
, m_rootLayerAttachment(RootLayerUnattached)
#if PROFILE_LAYER_REBUILD
, m_rootLayerUpdateCount(0)
#endif // PROFILE_LAYER_REBUILD
{
Settings* settings = m_renderView->document()->settings();
ASSERT(m_renderView->document()->frame());
if (settings && settings->forceCompositingMode() && settings->acceleratedCompositingEnabled()
&& !m_renderView->document()->frame()->tree()->parent()) {
m_forceCompositingMode = true;
enableCompositingMode();
}
}
RenderLayerCompositor::~RenderLayerCompositor()
{
ASSERT(m_rootLayerAttachment == RootLayerUnattached);
}
void RenderLayerCompositor::enableCompositingMode(bool enable )
{
if (enable != m_compositing) {
m_compositing = enable;
if (m_compositing) {
ensureRootLayer();
notifyIFramesOfCompositingChange();
} else
destroyRootLayer();
}
}
void RenderLayerCompositor::cacheAcceleratedCompositingFlags()
{
bool hasAcceleratedCompositing = false;
bool showDebugBorders = false;
bool showRepaintCounter = false;
if (Settings* settings = m_renderView->document()->settings()) {
hasAcceleratedCompositing = settings->acceleratedCompositingEnabled();
showDebugBorders = settings->showDebugBorders();
showRepaintCounter = settings->showRepaintCounter();
}
if (hasAcceleratedCompositing) {
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (page) {
ChromeClient* chromeClient = page->chrome()->client();
m_compositingTriggers = chromeClient->allowedCompositingTriggers();
hasAcceleratedCompositing = m_compositingTriggers;
}
}
if (hasAcceleratedCompositing != m_hasAcceleratedCompositing || showDebugBorders != m_showDebugBorders || showRepaintCounter != m_showRepaintCounter)
setCompositingLayersNeedRebuild();
m_hasAcceleratedCompositing = hasAcceleratedCompositing;
m_showDebugBorders = showDebugBorders;
m_showRepaintCounter = showRepaintCounter;
}
bool RenderLayerCompositor::canRender3DTransforms() const
{
return hasAcceleratedCompositing() && (m_compositingTriggers & ChromeClient::ThreeDTransformTrigger);
}
void RenderLayerCompositor::setCompositingLayersNeedRebuild(bool needRebuild)
{
if (inCompositingMode())
m_compositingLayersNeedRebuild = needRebuild;
}
void RenderLayerCompositor::scheduleLayerFlush()
{
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (!page)
return;
page->chrome()->client()->scheduleCompositingLayerSync();
}
ChromeClient* RenderLayerCompositor::chromeClient() const
{
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (!page)
return 0;
return page->chrome()->client();
}
void RenderLayerCompositor::flushPendingLayerChanges(bool isFlushRoot)
{
if (!isFlushRoot && rootLayerAttachment() == RootLayerAttachedViaEnclosingFrame)
return;
ChromeClient* chromeClient = this->chromeClient();
if (chromeClient)
chromeClient->willSyncCompositingLayers();
ASSERT(!m_flushingLayers);
m_flushingLayers = true;
if (GraphicsLayer* rootLayer = rootGraphicsLayer())
rootLayer->syncCompositingState();
ASSERT(m_flushingLayers);
m_flushingLayers = false;
if (chromeClient)
chromeClient->didSyncCompositingLayers();
if (!m_fixedPositionLayersNeedingUpdate.isEmpty()) {
HashSet<RenderLayer*>::const_iterator end = m_fixedPositionLayersNeedingUpdate.end();
for (HashSet<RenderLayer*>::const_iterator it = m_fixedPositionLayersNeedingUpdate.begin(); it != end; ++it)
registerOrUpdateFixedPositionLayer(*it);
m_fixedPositionLayersNeedingUpdate.clear();
}
}
void RenderLayerCompositor::didFlushChangesForLayer(RenderLayer* layer)
{
if (m_fixedPositionLayers.contains(layer))
m_fixedPositionLayersNeedingUpdate.add(layer);
}
RenderLayerCompositor* RenderLayerCompositor::enclosingCompositorFlushingLayers() const
{
if (!m_renderView->frameView())
return 0;
for (Frame* frame = m_renderView->frameView()->frame(); frame; frame = frame->tree()->parent()) {
RenderLayerCompositor* compositor = frame->contentRenderer() ? frame->contentRenderer()->compositor() : 0;
if (compositor->isFlushingLayers())
return compositor;
}
return 0;
}
void RenderLayerCompositor::scheduleCompositingLayerUpdate()
{
if (!m_updateCompositingLayersTimer.isActive())
m_updateCompositingLayersTimer.startOneShot(0);
}
bool RenderLayerCompositor::compositingLayerUpdatePending() const
{
return m_updateCompositingLayersTimer.isActive();
}
void RenderLayerCompositor::updateCompositingLayersTimerFired(Timer<RenderLayerCompositor>*)
{
updateCompositingLayers();
}
void RenderLayerCompositor::updateCompositingLayers(CompositingUpdateType updateType, RenderLayer* updateRoot)
{
m_updateCompositingLayersTimer.stop();
if (!m_compositingDependsOnGeometry && !m_compositing)
return;
bool checkForHierarchyUpdate = m_compositingDependsOnGeometry;
bool needGeometryUpdate = false;
switch (updateType) {
case CompositingUpdateAfterLayoutOrStyleChange:
case CompositingUpdateOnPaitingOrHitTest:
checkForHierarchyUpdate = true;
break;
case CompositingUpdateOnScroll:
if (m_compositingConsultsOverlap)
checkForHierarchyUpdate = true;
needGeometryUpdate = true;
break;
}
if (!checkForHierarchyUpdate && !needGeometryUpdate)
return;
bool needHierarchyUpdate = m_compositingLayersNeedRebuild;
if (!updateRoot || m_compositingConsultsOverlap) {
m_compositingLayersNeedRebuild = false;
updateRoot = rootRenderLayer();
}
#if PROFILE_LAYER_REBUILD
++m_rootLayerUpdateCount;
double startTime = WTF::currentTime();
#endif
if (checkForHierarchyUpdate) {
if (ChromeClient* chromeClient = this->chromeClient())
chromeClient->removeAllFixedPositionLayers();
CompositingState compState(updateRoot);
bool layersChanged = false;
if (m_compositingConsultsOverlap) {
OverlapMap overlapTestRequestMap;
computeCompositingRequirements(updateRoot, &overlapTestRequestMap, compState, layersChanged);
} else
computeCompositingRequirements(updateRoot, 0, compState, layersChanged);
needHierarchyUpdate |= layersChanged;
}
if (needHierarchyUpdate) {
CompositingState compState(updateRoot);
Vector<GraphicsLayer*> childList;
rebuildCompositingLayerTree(updateRoot, compState, childList);
if (updateRoot == rootRenderLayer()) {
if (childList.isEmpty())
destroyRootLayer();
else
m_rootContentLayer->setChildren(childList);
}
} else if (needGeometryUpdate) {
updateLayerTreeGeometry(updateRoot);
}
#if PROFILE_LAYER_REBUILD
double endTime = WTF::currentTime();
if (updateRoot == rootRenderLayer())
fprintf(stderr, "Update %d: computeCompositingRequirements for the world took %fms\n",
m_rootLayerUpdateCount, 1000.0 * (endTime - startTime));
#endif
ASSERT(updateRoot || !m_compositingLayersNeedRebuild);
if (!hasAcceleratedCompositing())
enableCompositingMode(false);
}
bool RenderLayerCompositor::updateBacking(RenderLayer* layer, CompositingChangeRepaint shouldRepaint)
{
bool layerChanged = false;
if (needsToBeComposited(layer)) {
enableCompositingMode();
if (requiresCompositingForTransform(layer->renderer()))
setCompositingConsultsOverlap(false);
if (!layer->backing()) {
if (shouldRepaint == CompositingChangeRepaintNow)
repaintOnCompositingChange(layer);
layer->ensureBacking();
#if PLATFORM(MAC) && USE(CA)
if (m_renderView->document()->settings()->acceleratedDrawingEnabled())
layer->backing()->graphicsLayer()->setAcceleratesDrawing(true);
else if (layer->renderer()->isCanvas()) {
HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(layer->renderer()->node());
if (canvas->renderingContext() && canvas->renderingContext()->isAccelerated())
layer->backing()->graphicsLayer()->setAcceleratesDrawing(true);
}
#endif
layerChanged = true;
}
updateFixedPositionStatus(layer);
} else {
if (layer->backing()) {
if (layer->isReflection()) {
RenderLayer* sourceLayer = toRenderBoxModelObject(layer->renderer()->parent())->layer();
if (RenderLayerBacking* backing = sourceLayer->backing()) {
ASSERT(backing->graphicsLayer()->replicaLayer() == layer->backing()->graphicsLayer());
backing->graphicsLayer()->setReplicatedByLayer(0);
}
}
removeFixedPositionLayer(layer);
layer->clearBacking();
layerChanged = true;
layer->computeRepaintRects();
if (shouldRepaint == CompositingChangeRepaintNow)
repaintOnCompositingChange(layer);
}
}
#if ENABLE(VIDEO)
if (layerChanged && layer->renderer()->isVideo()) {
RenderVideo* video = toRenderVideo(layer->renderer());
video->acceleratedRenderingStateChanged();
}
#endif
if (layerChanged && layer->renderer()->isRenderPart()) {
RenderLayerCompositor* innerCompositor = frameContentsCompositor(toRenderPart(layer->renderer()));
if (innerCompositor && innerCompositor->inCompositingMode())
innerCompositor->updateRootLayerAttachment();
}
return layerChanged;
}
bool RenderLayerCompositor::updateLayerCompositingState(RenderLayer* layer, CompositingChangeRepaint shouldRepaint)
{
bool layerChanged = updateBacking(layer, shouldRepaint);
if (layer->backing() && layer->backing()->updateGraphicsLayerConfiguration())
layerChanged = true;
return layerChanged;
}
void RenderLayerCompositor::repaintOnCompositingChange(RenderLayer* layer)
{
if (layer->renderer() != m_renderView && !layer->renderer()->parent())
return;
RenderBoxModelObject* repaintContainer = layer->renderer()->containerForRepaint();
if (!repaintContainer)
repaintContainer = m_renderView;
layer->repaintIncludingNonCompositingDescendants(repaintContainer);
if (repaintContainer == m_renderView) {
m_renderView->frameView()->setNeedsOneShotDrawingSynchronization();
}
}
IntRect RenderLayerCompositor::calculateCompositedBounds(const RenderLayer* layer, const RenderLayer* ancestorLayer)
{
if (!canBeComposited(layer))
return IntRect();
IntRect boundingBoxRect = layer->localBoundingBox();
if (layer->renderer()->isRoot()) {
if (m_renderView->frameView()) {
int rw = m_renderView->frameView()->contentsWidth();
int rh = m_renderView->frameView()->contentsHeight();
boundingBoxRect.setWidth(max(boundingBoxRect.width(), rw - boundingBoxRect.x()));
boundingBoxRect.setHeight(max(boundingBoxRect.height(), rh - boundingBoxRect.y()));
}
}
IntRect unionBounds = boundingBoxRect;
if (layer->renderer()->hasOverflowClip() || layer->renderer()->hasMask()) {
int ancestorRelX = 0, ancestorRelY = 0;
layer->convertToLayerCoords(ancestorLayer, ancestorRelX, ancestorRelY);
boundingBoxRect.move(ancestorRelX, ancestorRelY);
return boundingBoxRect;
}
if (RenderLayer* reflection = layer->reflectionLayer()) {
if (!reflection->isComposited()) {
IntRect childUnionBounds = calculateCompositedBounds(reflection, layer);
unionBounds.unite(childUnionBounds);
}
}
ASSERT(layer->isStackingContext() || (!layer->m_posZOrderList || layer->m_posZOrderList->size() == 0));
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = negZOrderList->at(i);
if (!curLayer->isComposited()) {
IntRect childUnionBounds = calculateCompositedBounds(curLayer, layer);
unionBounds.unite(childUnionBounds);
}
}
}
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = posZOrderList->at(i);
if (!curLayer->isComposited()) {
IntRect childUnionBounds = calculateCompositedBounds(curLayer, layer);
unionBounds.unite(childUnionBounds);
}
}
}
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = normalFlowList->at(i);
if (!curLayer->isComposited()) {
IntRect curAbsBounds = calculateCompositedBounds(curLayer, layer);
unionBounds.unite(curAbsBounds);
}
}
}
if (layer->paintsWithTransform(PaintBehaviorNormal)) {
TransformationMatrix* affineTrans = layer->transform();
boundingBoxRect = affineTrans->mapRect(boundingBoxRect);
unionBounds = affineTrans->mapRect(unionBounds);
}
int ancestorRelX = 0, ancestorRelY = 0;
layer->convertToLayerCoords(ancestorLayer, ancestorRelX, ancestorRelY);
unionBounds.move(ancestorRelX, ancestorRelY);
return unionBounds;
}
void RenderLayerCompositor::layerWasAdded(RenderLayer* , RenderLayer* )
{
setCompositingLayersNeedRebuild();
}
void RenderLayerCompositor::layerWillBeRemoved(RenderLayer* parent, RenderLayer* child)
{
if (!child->isComposited() || parent->renderer()->documentBeingDestroyed())
return;
removeFixedPositionLayer(child);
setCompositingParent(child, 0);
RenderLayer* compLayer = parent->enclosingCompositingLayer();
if (compLayer) {
ASSERT(compLayer->backing());
IntRect compBounds = child->backing()->compositedBounds();
int offsetX = 0, offsetY = 0;
child->convertToLayerCoords(compLayer, offsetX, offsetY);
compBounds.move(offsetX, offsetY);
compLayer->setBackingNeedsRepaintInRect(compBounds);
m_renderView->frameView()->setNeedsOneShotDrawingSynchronization();
}
setCompositingLayersNeedRebuild();
}
RenderLayer* RenderLayerCompositor::enclosingNonStackingClippingLayer(const RenderLayer* layer) const
{
for (RenderLayer* curr = layer->parent(); curr != 0; curr = curr->parent()) {
if (curr->isStackingContext())
return 0;
if (curr->renderer()->hasOverflowClip() || curr->renderer()->hasClip())
return curr;
}
return 0;
}
void RenderLayerCompositor::addToOverlapMap(OverlapMap& overlapMap, RenderLayer* layer, IntRect& layerBounds, bool& boundsComputed)
{
if (layer->isRootLayer())
return;
if (!boundsComputed) {
layerBounds = layer->renderer()->localToAbsoluteQuad(FloatRect(layer->localBoundingBox())).enclosingBoundingBox();
if (layerBounds.isEmpty())
layerBounds.setSize(IntSize(1, 1));
boundsComputed = true;
}
overlapMap.add(layer, layerBounds);
}
bool RenderLayerCompositor::overlapsCompositedLayers(OverlapMap& overlapMap, const IntRect& layerBounds)
{
RenderLayerCompositor::OverlapMap::const_iterator end = overlapMap.end();
for (RenderLayerCompositor::OverlapMap::const_iterator it = overlapMap.begin(); it != end; ++it) {
const IntRect& bounds = it->second;
if (layerBounds.intersects(bounds))
return true;
}
return false;
}
void RenderLayerCompositor::computeCompositingRequirements(RenderLayer* layer, OverlapMap* overlapMap, struct CompositingState& compositingState, bool& layersChanged)
{
layer->updateLayerPosition();
layer->updateZOrderLists();
layer->updateNormalFlowList();
layer->setHasCompositingDescendant(false);
bool mustOverlapCompositedLayers = compositingState.m_subtreeIsCompositing;
bool haveComputedBounds = false;
IntRect absBounds;
if (overlapMap && !overlapMap->isEmpty()) {
absBounds = layer->renderer()->localToAbsoluteQuad(FloatRect(layer->localBoundingBox())).enclosingBoundingBox();
if (absBounds.isEmpty())
absBounds.setSize(IntSize(1, 1));
haveComputedBounds = true;
mustOverlapCompositedLayers = overlapsCompositedLayers(*overlapMap, absBounds);
}
layer->setMustOverlapCompositedLayers(mustOverlapCompositedLayers);
CompositingState childState(compositingState.m_compositingAncestor);
#ifndef NDEBUG
++childState.m_depth;
#endif
bool willBeComposited = needsToBeComposited(layer);
if (willBeComposited) {
compositingState.m_subtreeIsCompositing = true;
childState.m_compositingAncestor = layer;
if (overlapMap)
addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds);
}
#if ENABLE(VIDEO)
if (willBeComposited && layer->renderer()->isVideo())
childState.m_subtreeIsCompositing = true;
#endif
if (layer->isStackingContext()) {
ASSERT(!layer->m_zOrderListsDirty);
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = negZOrderList->at(i);
computeCompositingRequirements(curLayer, overlapMap, childState, layersChanged);
if (!willBeComposited && childState.m_subtreeIsCompositing) {
layer->setMustOverlapCompositedLayers(true);
childState.m_compositingAncestor = layer;
if (overlapMap)
addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds);
willBeComposited = true;
}
}
}
}
ASSERT(!layer->m_normalFlowListDirty);
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = normalFlowList->at(i);
computeCompositingRequirements(curLayer, overlapMap, childState, layersChanged);
}
}
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = posZOrderList->at(i);
computeCompositingRequirements(curLayer, overlapMap, childState, layersChanged);
}
}
}
if (layer->isRootLayer()) {
if (inCompositingMode() && m_hasAcceleratedCompositing)
willBeComposited = true;
}
ASSERT(willBeComposited == needsToBeComposited(layer));
if (!willBeComposited && canBeComposited(layer) && childState.m_subtreeIsCompositing && requiresCompositingWhenDescendantsAreCompositing(layer->renderer())) {
layer->setMustOverlapCompositedLayers(true);
if (overlapMap)
addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds);
willBeComposited = true;
}
ASSERT(willBeComposited == needsToBeComposited(layer));
if (layer->reflectionLayer())
layer->reflectionLayer()->setMustOverlapCompositedLayers(willBeComposited);
if (childState.m_subtreeIsCompositing)
compositingState.m_subtreeIsCompositing = true;
layer->setHasCompositingDescendant(childState.m_subtreeIsCompositing);
if (!willBeComposited && canBeComposited(layer) && clipsCompositingDescendants(layer)) {
if (overlapMap)
addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds);
willBeComposited = true;
}
if (layer->isRootLayer() && !childState.m_subtreeIsCompositing && !requiresCompositingLayer(layer) && !m_forceCompositingMode) {
}
ASSERT(willBeComposited == needsToBeComposited(layer));
if (!layer->isComposited() && willBeComposited)
repaintOnCompositingChange(layer);
if (updateBacking(layer, CompositingChangeRepaintNow))
layersChanged = true;
if (layer->reflectionLayer() && updateLayerCompositingState(layer->reflectionLayer(), CompositingChangeRepaintNow))
layersChanged = true;
}
void RenderLayerCompositor::setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer)
{
ASSERT(!parentLayer || childLayer->ancestorCompositingLayer() == parentLayer);
ASSERT(childLayer->isComposited());
if (!parentLayer || !parentLayer->isComposited())
return;
if (parentLayer) {
GraphicsLayer* hostingLayer = parentLayer->backing()->parentForSublayers();
GraphicsLayer* hostedLayer = childLayer->backing()->childForSuperlayers();
hostingLayer->addChild(hostedLayer);
} else
childLayer->backing()->childForSuperlayers()->removeFromParent();
}
void RenderLayerCompositor::removeCompositedChildren(RenderLayer* layer)
{
ASSERT(layer->isComposited());
GraphicsLayer* hostingLayer = layer->backing()->parentForSublayers();
hostingLayer->removeAllChildren();
}
#if ENABLE(VIDEO)
bool RenderLayerCompositor::canAccelerateVideoRendering(RenderVideo* o) const
{
if (!m_hasAcceleratedCompositing)
return false;
return o->supportsAcceleratedRendering();
}
#endif
void RenderLayerCompositor::rebuildCompositingLayerTree(RenderLayer* layer, const CompositingState& compositingState, Vector<GraphicsLayer*>& childLayersOfEnclosingLayer)
{
RenderLayerBacking* layerBacking = layer->backing();
if (layerBacking) {
layerBacking->updateCompositedBounds();
if (RenderLayer* reflection = layer->reflectionLayer()) {
if (reflection->backing())
reflection->backing()->updateCompositedBounds();
}
layerBacking->updateGraphicsLayerConfiguration();
layerBacking->updateGraphicsLayerGeometry();
if (!layer->parent())
updateRootLayerPosition();
}
Vector<GraphicsLayer*> layerChildren;
Vector<GraphicsLayer*>& childList = layerBacking ? layerChildren : childLayersOfEnclosingLayer;
CompositingState childState = compositingState;
if (layer->isComposited())
childState.m_compositingAncestor = layer;
#ifndef NDEBUG
++childState.m_depth;
#endif
childState.m_subtreeIsCompositing = false;
if (layer->isStackingContext()) {
ASSERT(!layer->m_zOrderListsDirty);
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = negZOrderList->at(i);
rebuildCompositingLayerTree(curLayer, childState, childList);
}
}
if (layerBacking && layerBacking->foregroundLayer())
childList.append(layerBacking->foregroundLayer());
}
ASSERT(!layer->m_normalFlowListDirty);
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = normalFlowList->at(i);
rebuildCompositingLayerTree(curLayer, childState, childList);
}
}
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = posZOrderList->at(i);
rebuildCompositingLayerTree(curLayer, childState, childList);
}
}
}
if (layerBacking) {
bool parented = false;
if (layer->renderer()->isRenderPart())
parented = parentFrameContentLayers(toRenderPart(layer->renderer()));
if (!layerBacking->hasClippingLayer()) {
if (GraphicsLayer* overflowControlLayer = layerBacking->layerForHorizontalScrollbar()) {
overflowControlLayer->removeFromParent();
layerChildren.append(overflowControlLayer);
}
if (GraphicsLayer* overflowControlLayer = layerBacking->layerForVerticalScrollbar()) {
overflowControlLayer->removeFromParent();
layerChildren.append(overflowControlLayer);
}
if (GraphicsLayer* overflowControlLayer = layerBacking->layerForScrollCorner()) {
overflowControlLayer->removeFromParent();
layerChildren.append(overflowControlLayer);
}
}
if (!parented)
layerBacking->parentForSublayers()->setChildren(layerChildren);
#if ENABLE(FULLSCREEN_API)
if (layer->renderer()->isRenderFullScreen() && m_renderView->document()->isAnimatingFullScreen())
return;
#endif
childLayersOfEnclosingLayer.append(layerBacking->childForSuperlayers());
}
}
void RenderLayerCompositor::frameViewDidChangeLocation(const IntPoint& contentsOffset)
{
if (m_overflowControlsHostLayer)
m_overflowControlsHostLayer->setPosition(contentsOffset);
}
void RenderLayerCompositor::frameViewDidChangeSize()
{
if (m_clipLayer) {
FrameView* frameView = m_renderView->frameView();
m_clipLayer->setSize(frameView->visibleContentRect(false ).size());
IntPoint scrollPosition = frameView->scrollPosition();
m_scrollLayer->setPosition(FloatPoint(-scrollPosition.x(), -scrollPosition.y()));
updateOverflowControlsLayers();
}
}
void RenderLayerCompositor::frameViewDidScroll(const IntPoint& scrollPosition)
{
if (m_scrollLayer)
m_scrollLayer->setPosition(FloatPoint(-scrollPosition.x(), -scrollPosition.y()));
}
String RenderLayerCompositor::layerTreeAsText(bool showDebugInfo)
{
if (compositingLayerUpdatePending())
updateCompositingLayers();
if (!m_rootContentLayer)
return String();
return m_rootContentLayer->layerTreeAsText(showDebugInfo ? LayerTreeAsTextDebug : LayerTreeAsTextBehaviorNormal);
}
RenderLayerCompositor* RenderLayerCompositor::frameContentsCompositor(RenderPart* renderer)
{
if (!renderer->node()->isFrameOwnerElement())
return 0;
HTMLFrameOwnerElement* element = static_cast<HTMLFrameOwnerElement*>(renderer->node());
if (Document* contentDocument = element->contentDocument()) {
if (RenderView* view = contentDocument->renderView())
return view->compositor();
}
return 0;
}
bool RenderLayerCompositor::parentFrameContentLayers(RenderPart* renderer)
{
RenderLayerCompositor* innerCompositor = frameContentsCompositor(renderer);
if (!innerCompositor || !innerCompositor->inCompositingMode() || innerCompositor->rootLayerAttachment() != RootLayerAttachedViaEnclosingFrame)
return false;
RenderLayer* layer = renderer->layer();
if (!layer->isComposited())
return false;
RenderLayerBacking* backing = layer->backing();
GraphicsLayer* hostingLayer = backing->parentForSublayers();
GraphicsLayer* rootLayer = innerCompositor->rootGraphicsLayer();
if (hostingLayer->children().size() != 1 || hostingLayer->children()[0] != rootLayer) {
hostingLayer->removeAllChildren();
hostingLayer->addChild(rootLayer);
}
return true;
}
void RenderLayerCompositor::updateLayerTreeGeometry(RenderLayer* layer)
{
if (RenderLayerBacking* layerBacking = layer->backing()) {
layerBacking->updateCompositedBounds();
if (RenderLayer* reflection = layer->reflectionLayer()) {
if (reflection->backing())
reflection->backing()->updateCompositedBounds();
}
layerBacking->updateGraphicsLayerConfiguration();
layerBacking->updateGraphicsLayerGeometry();
if (!layer->parent())
updateRootLayerPosition();
}
if (layer->isStackingContext()) {
ASSERT(!layer->m_zOrderListsDirty);
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i)
updateLayerTreeGeometry(negZOrderList->at(i));
}
}
ASSERT(!layer->m_normalFlowListDirty);
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i)
updateLayerTreeGeometry(normalFlowList->at(i));
}
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i)
updateLayerTreeGeometry(posZOrderList->at(i));
}
}
}
void RenderLayerCompositor::updateCompositingDescendantGeometry(RenderLayer* compositingAncestor, RenderLayer* layer, RenderLayerBacking::UpdateDepth updateDepth)
{
if (layer != compositingAncestor) {
if (RenderLayerBacking* layerBacking = layer->backing()) {
layerBacking->updateCompositedBounds();
if (RenderLayer* reflection = layer->reflectionLayer()) {
if (reflection->backing())
reflection->backing()->updateCompositedBounds();
}
layerBacking->updateGraphicsLayerGeometry();
if (updateDepth == RenderLayerBacking::CompositingChildren)
return;
}
}
if (layer->reflectionLayer())
updateCompositingDescendantGeometry(compositingAncestor, layer->reflectionLayer(), updateDepth);
if (!layer->hasCompositingDescendant())
return;
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i)
updateCompositingDescendantGeometry(compositingAncestor, negZOrderList->at(i), updateDepth);
}
}
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i)
updateCompositingDescendantGeometry(compositingAncestor, normalFlowList->at(i), updateDepth);
}
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i)
updateCompositingDescendantGeometry(compositingAncestor, posZOrderList->at(i), updateDepth);
}
}
}
void RenderLayerCompositor::repaintCompositedLayersAbsoluteRect(const IntRect& absRect)
{
recursiveRepaintLayerRect(rootRenderLayer(), absRect);
}
void RenderLayerCompositor::recursiveRepaintLayerRect(RenderLayer* layer, const IntRect& rect)
{
if (layer->isComposited())
layer->setBackingNeedsRepaintInRect(rect);
if (layer->hasCompositingDescendant()) {
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = negZOrderList->at(i);
int x = 0;
int y = 0;
curLayer->convertToLayerCoords(layer, x, y);
IntRect childRect(rect);
childRect.move(-x, -y);
recursiveRepaintLayerRect(curLayer, childRect);
}
}
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = posZOrderList->at(i);
int x = 0;
int y = 0;
curLayer->convertToLayerCoords(layer, x, y);
IntRect childRect(rect);
childRect.move(-x, -y);
recursiveRepaintLayerRect(curLayer, childRect);
}
}
}
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = normalFlowList->at(i);
int x = 0;
int y = 0;
curLayer->convertToLayerCoords(layer, x, y);
IntRect childRect(rect);
childRect.move(-x, -y);
recursiveRepaintLayerRect(curLayer, childRect);
}
}
}
RenderLayer* RenderLayerCompositor::rootRenderLayer() const
{
return m_renderView->layer();
}
GraphicsLayer* RenderLayerCompositor::rootGraphicsLayer() const
{
if (m_overflowControlsHostLayer)
return m_overflowControlsHostLayer.get();
return m_rootContentLayer.get();
}
void RenderLayerCompositor::didMoveOnscreen()
{
if (!inCompositingMode() || m_rootLayerAttachment != RootLayerUnattached)
return;
RootLayerAttachment attachment = shouldPropagateCompositingToEnclosingFrame() ? RootLayerAttachedViaEnclosingFrame : RootLayerAttachedViaChromeClient;
attachRootLayer(attachment);
registerAllFixedPositionLayers();
registerAllScrollingLayers();
}
void RenderLayerCompositor::willMoveOffscreen()
{
if (!inCompositingMode() || m_rootLayerAttachment == RootLayerUnattached)
return;
detachRootLayer();
unregisterAllFixedPositionLayers();
unregisterAllScrollingLayers();
}
void RenderLayerCompositor::clearBackingForLayerIncludingDescendants(RenderLayer* layer)
{
if (!layer)
return;
if (layer->isComposited()) {
removeFixedPositionLayer(layer);
layer->clearBacking();
}
for (RenderLayer* currLayer = layer->firstChild(); currLayer; currLayer = currLayer->nextSibling())
clearBackingForLayerIncludingDescendants(currLayer);
}
void RenderLayerCompositor::clearBackingForAllLayers()
{
clearBackingForLayerIncludingDescendants(m_renderView->layer());
}
void RenderLayerCompositor::updateRootLayerPosition()
{
if (m_rootContentLayer) {
const IntRect& documentRect = m_renderView->documentRect();
m_rootContentLayer->setSize(documentRect.size());
m_rootContentLayer->setPosition(documentRect.location());
}
if (m_clipLayer) {
FrameView* frameView = m_renderView->frameView();
m_clipLayer->setSize(frameView->visibleContentRect(false ).size());
}
}
void RenderLayerCompositor::didStartAcceleratedAnimation(CSSPropertyID property)
{
if (property == CSSPropertyWebkitTransform)
setCompositingConsultsOverlap(false);
}
bool RenderLayerCompositor::has3DContent() const
{
return layerHas3DContent(rootRenderLayer());
}
bool RenderLayerCompositor::allowsIndependentlyCompositedFrames(const FrameView* view)
{
UNUSED_PARAM(view);
return false;
}
bool RenderLayerCompositor::shouldPropagateCompositingToEnclosingFrame() const
{
HTMLFrameOwnerElement* ownerElement = enclosingFrameElement();
RenderObject* renderer = ownerElement ? ownerElement->renderer() : 0;
if (!ownerElement)
return false;
if (!allowsIndependentlyCompositedFrames(m_renderView->frameView()))
return true;
if (!renderer || !renderer->isRenderPart())
return false;
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (page->mainFrame()->pageScaleFactor() != 1)
return true;
RenderPart* frameRenderer = toRenderPart(renderer);
if (frameRenderer->widget()) {
ASSERT(frameRenderer->widget()->isFrameView());
FrameView* view = static_cast<FrameView*>(frameRenderer->widget());
if (view->isOverlappedIncludingAncestors() || view->hasCompositingAncestor())
return true;
}
return false;
}
HTMLFrameOwnerElement* RenderLayerCompositor::enclosingFrameElement() const
{
if (HTMLFrameOwnerElement* ownerElement = m_renderView->document()->ownerElement())
return (ownerElement->hasTagName(iframeTag) || ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(objectTag)) ? ownerElement : 0;
return 0;
}
bool RenderLayerCompositor::needsToBeComposited(const RenderLayer* layer) const
{
if (!canBeComposited(layer))
return false;
return requiresCompositingLayer(layer) || layer->mustOverlapCompositedLayers() || (inCompositingMode() && layer->isRootLayer());
}
bool RenderLayerCompositor::requiresCompositingLayer(const RenderLayer* layer) const
{
RenderObject* renderer = layer->renderer();
if (layer->isReflection()) {
renderer = renderer->parent(); layer = toRenderBoxModelObject(renderer)->layer();
}
return requiresCompositingForTransform(renderer)
|| requiresCompositingForVideo(renderer)
|| requiresCompositingForCanvas(renderer)
|| requiresCompositingForPlugin(renderer)
|| requiresCompositingForFrame(renderer)
|| (canRender3DTransforms() && renderer->style()->backfaceVisibility() == BackfaceVisibilityHidden)
|| clipsCompositingDescendants(layer)
|| requiresCompositingForAnimation(renderer)
|| requiresCompositingForFullScreen(renderer)
|| requiresCompositingForPosition(renderer)
|| requiresCompositingForScrolling(renderer)
;
}
bool RenderLayerCompositor::canBeComposited(const RenderLayer* layer) const
{
return m_hasAcceleratedCompositing && layer->isSelfPaintingLayer();
}
bool RenderLayerCompositor::clippedByAncestor(RenderLayer* layer) const
{
if (!layer->isComposited() || !layer->parent())
return false;
RenderLayer* compositingAncestor = layer->ancestorCompositingLayer();
if (!compositingAncestor)
return false;
RenderLayer* computeClipRoot = 0;
RenderLayer* curr = layer;
while (curr) {
RenderLayer* next = curr->parent();
if (next == compositingAncestor) {
computeClipRoot = curr;
break;
}
curr = next;
}
if (!computeClipRoot || computeClipRoot == layer)
return false;
IntRect backgroundRect = layer->backgroundClipRect(computeClipRoot, true);
return backgroundRect != PaintInfo::infiniteRect();
}
bool RenderLayerCompositor::clipsCompositingDescendants(const RenderLayer* layer) const
{
return layer->hasCompositingDescendant() &&
(layer->renderer()->hasOverflowClip() || layer->renderer()->hasClip());
}
bool RenderLayerCompositor::requiresCompositingForTransform(RenderObject* renderer) const
{
if (!(m_compositingTriggers & ChromeClient::ThreeDTransformTrigger))
return false;
RenderStyle* style = renderer->style();
return renderer->hasTransform() && (style->transform().has3DOperation() || style->transformStyle3D() == TransformStyle3DPreserve3D || style->hasPerspective());
}
bool RenderLayerCompositor::requiresCompositingForVideo(RenderObject* renderer) const
{
if (!(m_compositingTriggers & ChromeClient::VideoTrigger))
return false;
#if ENABLE(VIDEO)
if (renderer->isVideo()) {
RenderVideo* video = toRenderVideo(renderer);
return video->shouldDisplayVideo() && canAccelerateVideoRendering(video);
}
#if ENABLE(PLUGIN_PROXY_FOR_VIDEO)
else if (renderer->isRenderPart()) {
if (!m_hasAcceleratedCompositing)
return false;
Node* node = renderer->node();
if (!node || (!node->hasTagName(HTMLNames::videoTag) && !node->hasTagName(HTMLNames::audioTag)))
return false;
HTMLMediaElement* mediaElement = static_cast<HTMLMediaElement*>(node);
return mediaElement->player() ? mediaElement->player()->supportsAcceleratedRendering() : false;
}
#endif // ENABLE(PLUGIN_PROXY_FOR_VIDEO)
#else
UNUSED_PARAM(renderer);
#endif
return false;
}
bool RenderLayerCompositor::requiresCompositingForCanvas(RenderObject* renderer) const
{
if (!(m_compositingTriggers & ChromeClient::CanvasTrigger))
return false;
if (renderer->isCanvas()) {
HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(renderer->node());
return canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
}
return false;
}
bool RenderLayerCompositor::requiresCompositingForPlugin(RenderObject* renderer) const
{
if (!(m_compositingTriggers & ChromeClient::PluginTrigger))
return false;
bool composite = (renderer->isEmbeddedObject() && toRenderEmbeddedObject(renderer)->allowsAcceleratedCompositing())
|| (renderer->isApplet() && toRenderApplet(renderer)->allowsAcceleratedCompositing());
if (!composite)
return false;
m_compositingDependsOnGeometry = true;
RenderWidget* pluginRenderer = toRenderWidget(renderer);
if (pluginRenderer->needsLayout())
return pluginRenderer->hasLayer() && pluginRenderer->layer()->isComposited();
IntRect contentBox = pluginRenderer->contentBoxRect();
return contentBox.height() * contentBox.width() > 1;
}
bool RenderLayerCompositor::requiresCompositingForFrame(RenderObject* renderer) const
{
if (!renderer->isRenderPart())
return false;
RenderPart* frameRenderer = toRenderPart(renderer);
if (!frameRenderer->requiresAcceleratedCompositing())
return false;
m_compositingDependsOnGeometry = true;
RenderLayerCompositor* innerCompositor = frameContentsCompositor(frameRenderer);
if (!innerCompositor || !innerCompositor->shouldPropagateCompositingToEnclosingFrame())
return false;
if (renderer->needsLayout())
return frameRenderer->hasLayer() && frameRenderer->layer()->isComposited();
IntRect contentBox = frameRenderer->contentBoxRect();
return contentBox.height() * contentBox.width() > 0;
}
bool RenderLayerCompositor::requiresCompositingForAnimation(RenderObject* renderer) const
{
if (!(m_compositingTriggers & ChromeClient::AnimationTrigger))
return false;
if (AnimationController* animController = renderer->animation()) {
return (animController->isRunningAnimationOnRenderer(renderer, CSSPropertyOpacity)
)
|| animController->isRunningAnimationOnRenderer(renderer, CSSPropertyWebkitTransform);
}
return false;
}
bool RenderLayerCompositor::requiresCompositingWhenDescendantsAreCompositing(RenderObject* renderer) const
{
return renderer->hasTransform() || renderer->isTransparent() || renderer->hasMask() || renderer->hasReflection();
}
bool RenderLayerCompositor::requiresCompositingForFullScreen(RenderObject* renderer) const
{
#if ENABLE(FULLSCREEN_API)
return renderer->isRenderFullScreen() && m_renderView->document()->isAnimatingFullScreen();
#else
UNUSED_PARAM(renderer);
return false;
#endif
}
bool RenderLayerCompositor::requiresCompositingForPosition(RenderObject* renderer) const
{
return m_renderView->hasCustomFixedPosition(renderer, RenderView::DontCheckContainingBlock);
}
bool RenderLayerCompositor::requiresCompositingForScrolling(RenderObject* renderer) const
{
return renderer->hasLayer() && toRenderBoxModelObject(renderer)->layer()->hasAcceleratedTouchScrolling();
}
bool RenderLayerCompositor::needsContentsCompositingLayer(const RenderLayer* layer) const
{
return (layer->m_negZOrderList && layer->m_negZOrderList->size() > 0);
}
bool RenderLayerCompositor::requiresScrollLayer(RootLayerAttachment attachment) const
{
return !m_renderView->frameView()->platformWidget() || attachment == RootLayerAttachedViaEnclosingFrame; }
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.move(scrollbarRect.x(), scrollbarRect.y());
scrollbar->paint(&context, transformedClip);
context.restore();
}
void RenderLayerCompositor::paintContents(const GraphicsLayer* graphicsLayer, GraphicsContext& context, GraphicsLayerPaintingPhase, const IntRect& clip)
{
if (graphicsLayer == layerForHorizontalScrollbar())
paintScrollbar(m_renderView->frameView()->horizontalScrollbar(), context, clip);
else if (graphicsLayer == layerForVerticalScrollbar())
paintScrollbar(m_renderView->frameView()->verticalScrollbar(), context, clip);
else if (graphicsLayer == layerForScrollCorner()) {
const IntRect& scrollCorner = m_renderView->frameView()->scrollCornerRect();
context.save();
context.translate(-scrollCorner.x(), -scrollCorner.y());
IntRect transformedClip = clip;
transformedClip.move(scrollCorner.x(), scrollCorner.y());
m_renderView->frameView()->paintScrollCorner(&context, transformedClip);
context.restore();
}
}
float RenderLayerCompositor::minimumDocumentScale() const
{
Frame* frame = m_renderView->frameView()->frame();
return frame ? frame->minimumDocumentScale() : 1;
}
bool RenderLayerCompositor::allowCompositingLayerVisualDegradation() const
{
Frame* frame = m_renderView->frameView()->frame();
if (!frame)
return true;
Page* page = frame->page();
if (!page)
return true;
return page->settings()->allowCompositingLayerVisualDegradation();
}
float RenderLayerCompositor::backingScaleFactor() const
{
Frame* frame = m_renderView->frameView()->frame();
if (!frame)
return 1;
return frame->deviceScaleFactor();
}
float RenderLayerCompositor::pageScaleFactor() const
{
Frame* frame = m_renderView->frameView()->frame();
if (!frame)
return 1;
return frame->documentScale();
}
void RenderLayerCompositor::didCommitChangesForLayer(const GraphicsLayer*) const
{
}
bool RenderLayerCompositor::keepLayersPixelAligned() const
{
return true;
}
static bool shouldCompositeOverflowControls(ScrollView* view)
{
if (view->platformWidget())
return false;
#if !PLATFORM(CHROMIUM)
if (!view->hasOverlayScrollbars())
return false;
#endif
return true;
}
bool RenderLayerCompositor::requiresHorizontalScrollbarLayer() const
{
ScrollView* view = m_renderView->frameView();
return shouldCompositeOverflowControls(view) && view->horizontalScrollbar();
}
bool RenderLayerCompositor::requiresVerticalScrollbarLayer() const
{
ScrollView* view = m_renderView->frameView();
return shouldCompositeOverflowControls(view) && view->verticalScrollbar();
}
bool RenderLayerCompositor::requiresScrollCornerLayer() const
{
ScrollView* view = m_renderView->frameView();
return shouldCompositeOverflowControls(view) && view->isScrollCornerVisible();
}
void RenderLayerCompositor::updateOverflowControlsLayers()
{
bool layersChanged = false;
if (requiresHorizontalScrollbarLayer()) {
m_layerForHorizontalScrollbar = GraphicsLayer::create(this);
#ifndef NDEBUG
m_layerForHorizontalScrollbar->setName("horizontal scrollbar");
#endif
m_overflowControlsHostLayer->addChild(m_layerForHorizontalScrollbar.get());
layersChanged = true;
} else if (m_layerForHorizontalScrollbar) {
m_layerForHorizontalScrollbar->removeFromParent();
m_layerForHorizontalScrollbar = nullptr;
layersChanged = true;
}
if (requiresVerticalScrollbarLayer()) {
m_layerForVerticalScrollbar = GraphicsLayer::create(this);
#ifndef NDEBUG
m_layerForVerticalScrollbar->setName("vertical scrollbar");
#endif
m_overflowControlsHostLayer->addChild(m_layerForVerticalScrollbar.get());
layersChanged = true;
} else if (m_layerForVerticalScrollbar) {
m_layerForVerticalScrollbar->removeFromParent();
m_layerForVerticalScrollbar = nullptr;
layersChanged = true;
}
if (requiresScrollCornerLayer()) {
m_layerForScrollCorner = GraphicsLayer::create(this);
#ifndef NDEBUG
m_layerForScrollCorner->setName("scroll corner");
#endif
m_overflowControlsHostLayer->addChild(m_layerForScrollCorner.get());
layersChanged = true;
} else if (m_layerForScrollCorner) {
m_layerForScrollCorner->removeFromParent();
m_layerForScrollCorner = nullptr;
layersChanged = true;
}
if (layersChanged)
m_renderView->frameView()->positionScrollbarLayers();
}
void RenderLayerCompositor::ensureRootLayer()
{
RootLayerAttachment expectedAttachment = shouldPropagateCompositingToEnclosingFrame() ? RootLayerAttachedViaEnclosingFrame : RootLayerAttachedViaChromeClient;
if (expectedAttachment == m_rootLayerAttachment)
return;
if (!m_rootContentLayer) {
m_rootContentLayer = GraphicsLayer::create(this);
#ifndef NDEBUG
m_rootContentLayer->setName("content root");
#endif
m_rootContentLayer->setSize(FloatSize(m_renderView->maxXLayoutOverflow(), m_renderView->maxYLayoutOverflow()));
m_rootContentLayer->setPosition(FloatPoint());
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (page && frame && page->mainFrame() == frame)
m_rootContentLayer->setAppliesPageScale();
m_rootContentLayer->setMasksToBounds(true);
}
if (requiresScrollLayer(expectedAttachment)) {
if (!m_overflowControlsHostLayer) {
ASSERT(!m_scrollLayer);
ASSERT(!m_clipLayer);
m_overflowControlsHostLayer = GraphicsLayer::create(this);
#ifndef NDEBUG
m_overflowControlsHostLayer->setName("overflow controls host");
#endif
m_clipLayer = GraphicsLayer::create(this);
#ifndef NDEBUG
m_clipLayer->setName("frame clipping");
#endif
m_clipLayer->setMasksToBounds(true);
m_scrollLayer = GraphicsLayer::create(this);
#ifndef NDEBUG
m_scrollLayer->setName("frame scrolling");
#endif
m_overflowControlsHostLayer->addChild(m_clipLayer.get());
m_clipLayer->addChild(m_scrollLayer.get());
m_scrollLayer->addChild(m_rootContentLayer.get());
frameViewDidChangeSize();
frameViewDidScroll(m_renderView->frameView()->scrollPosition());
}
} else {
if (m_overflowControlsHostLayer) {
m_overflowControlsHostLayer = nullptr;
m_clipLayer = nullptr;
m_scrollLayer = nullptr;
}
}
if (m_rootLayerAttachment != RootLayerUnattached)
detachRootLayer();
attachRootLayer(expectedAttachment);
}
void RenderLayerCompositor::destroyRootLayer()
{
if (!m_rootContentLayer)
return;
detachRootLayer();
if (m_layerForHorizontalScrollbar) {
m_layerForHorizontalScrollbar->removeFromParent();
m_layerForHorizontalScrollbar = nullptr;
if (Scrollbar* horizontalScrollbar = m_renderView->frameView()->verticalScrollbar())
m_renderView->frameView()->invalidateScrollbar(horizontalScrollbar, IntRect(IntPoint(0, 0), horizontalScrollbar->frameRect().size()));
}
if (m_layerForVerticalScrollbar) {
m_layerForVerticalScrollbar->removeFromParent();
m_layerForVerticalScrollbar = nullptr;
if (Scrollbar* verticalScrollbar = m_renderView->frameView()->verticalScrollbar())
m_renderView->frameView()->invalidateScrollbar(verticalScrollbar, IntRect(IntPoint(0, 0), verticalScrollbar->frameRect().size()));
}
if (m_layerForScrollCorner) {
m_layerForScrollCorner = nullptr;
m_renderView->frameView()->invalidateScrollCorner();
}
if (m_overflowControlsHostLayer) {
m_overflowControlsHostLayer = nullptr;
m_clipLayer = nullptr;
m_scrollLayer = nullptr;
}
ASSERT(!m_scrollLayer);
m_rootContentLayer = nullptr;
}
void RenderLayerCompositor::attachRootLayer(RootLayerAttachment attachment)
{
if (!m_rootContentLayer)
return;
switch (attachment) {
case RootLayerUnattached:
ASSERT_NOT_REACHED();
break;
case RootLayerAttachedViaChromeClient: {
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (!page)
return;
page->chrome()->client()->attachRootGraphicsLayer(frame, rootGraphicsLayer());
break;
}
case RootLayerAttachedViaEnclosingFrame: {
m_renderView->document()->ownerElement()->scheduleSetNeedsStyleRecalc(SyntheticStyleChange);
break;
}
}
m_rootLayerAttachment = attachment;
rootLayerAttachmentChanged();
}
void RenderLayerCompositor::detachRootLayer()
{
if (!m_rootContentLayer || m_rootLayerAttachment == RootLayerUnattached)
return;
switch (m_rootLayerAttachment) {
case RootLayerAttachedViaEnclosingFrame: {
if (m_overflowControlsHostLayer)
m_overflowControlsHostLayer->removeFromParent();
else
m_rootContentLayer->removeFromParent();
if (HTMLFrameOwnerElement* ownerElement = m_renderView->document()->ownerElement())
ownerElement->scheduleSetNeedsStyleRecalc(SyntheticStyleChange);
break;
}
case RootLayerAttachedViaChromeClient: {
Frame* frame = m_renderView->frameView()->frame();
Page* page = frame ? frame->page() : 0;
if (!page)
return;
page->chrome()->client()->attachRootGraphicsLayer(frame, 0);
}
break;
case RootLayerUnattached:
break;
}
m_rootLayerAttachment = RootLayerUnattached;
rootLayerAttachmentChanged();
}
void RenderLayerCompositor::updateRootLayerAttachment()
{
ensureRootLayer();
}
void RenderLayerCompositor::rootLayerAttachmentChanged()
{
RenderLayer* layer = m_renderView->layer();
if (RenderLayerBacking* backing = layer ? layer->backing() : 0)
backing->updateDrawsContent();
}
void RenderLayerCompositor::notifyIFramesOfCompositingChange()
{
Frame* frame = m_renderView->frameView() ? m_renderView->frameView()->frame() : 0;
if (!frame)
return;
for (Frame* child = frame->tree()->firstChild(); child; child = child->tree()->traverseNext(frame)) {
if (child->document() && child->document()->ownerElement())
child->document()->ownerElement()->scheduleSetNeedsStyleRecalc(SyntheticStyleChange);
}
if (HTMLFrameOwnerElement* ownerElement = m_renderView->document()->ownerElement())
ownerElement->scheduleSetNeedsStyleRecalc(SyntheticStyleChange);
}
bool RenderLayerCompositor::layerHas3DContent(const RenderLayer* layer) const
{
const RenderStyle* style = layer->renderer()->style();
if (style &&
(style->transformStyle3D() == TransformStyle3DPreserve3D ||
style->hasPerspective() ||
style->transform().has3DOperation()))
return true;
if (layer->isStackingContext()) {
if (Vector<RenderLayer*>* negZOrderList = layer->negZOrderList()) {
size_t listSize = negZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = negZOrderList->at(i);
if (layerHas3DContent(curLayer))
return true;
}
}
if (Vector<RenderLayer*>* posZOrderList = layer->posZOrderList()) {
size_t listSize = posZOrderList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = posZOrderList->at(i);
if (layerHas3DContent(curLayer))
return true;
}
}
}
if (Vector<RenderLayer*>* normalFlowList = layer->normalFlowList()) {
size_t listSize = normalFlowList->size();
for (size_t i = 0; i < listSize; ++i) {
RenderLayer* curLayer = normalFlowList->at(i);
if (layerHas3DContent(curLayer))
return true;
}
}
return false;
}
void RenderLayerCompositor::pageScaleFactorChanged()
{
RenderLayer* viewLayer = m_renderView->layer();
if (!viewLayer->isComposited())
return;
if (GraphicsLayer* rootLayer = viewLayer->backing()->graphicsLayer())
rootLayer->notePageScaleFactorChangedIncludingDescendants();
}
static bool isRootmostFixedLayer(RenderLayer* layer, RenderView* view)
{
if (!view->hasCustomFixedPosition(layer->renderer()))
return false;
for (RenderLayer* stackingContext = layer->stackingContext(); stackingContext; stackingContext = stackingContext->stackingContext()) {
if (stackingContext->isComposited() && stackingContext->renderer()->style()->position() == FixedPosition)
return false;
}
return true;
}
void RenderLayerCompositor::updateFixedPositionStatus(RenderLayer* layer)
{
if (isRootmostFixedLayer(layer, m_renderView))
addFixedPositionLayer(layer);
else
removeFixedPositionLayer(layer);
}
void RenderLayerCompositor::addFixedPositionLayer(RenderLayer* layer)
{
m_fixedPositionLayers.add(layer);
registerOrUpdateFixedPositionLayer(layer);
}
void RenderLayerCompositor::removeFixedPositionLayer(RenderLayer* layer)
{
if (!m_fixedPositionLayers.contains(layer))
return;
unregisterFixedPositionLayer(layer);
m_fixedPositionLayers.remove(layer);
}
void RenderLayerCompositor::platformLayerChanged(RenderLayer* renderLayer, PlatformLayer* oldLayer, PlatformLayer* newLayer)
{
if (m_fixedPositionLayers.contains(renderLayer)) {
if (ChromeClient* chromeClient = this->chromeClient()) {
bool isFlushing = enclosingCompositorFlushingLayers();
chromeClient->removeFixedPositionLayer(oldLayer, isFlushing);
ScrollingLayerSizing sizing;
FloatRect bounds;
FloatSize alignmentOffset;
getFixedPositionLayerSizing(renderLayer, sizing, bounds, alignmentOffset);
chromeClient->addOrUpdateFixedPositionLayer(newLayer, sizing, bounds, alignmentOffset, isFlushing);
}
}
if (m_scrollingLayers.contains(renderLayer)) {
RenderLayerBacking* backing = renderLayer->backing();
ASSERT(backing);
scrollingLayerAddedOrUpdated(renderLayer, backing->scrollingLayer()->platformLayer(), backing->scrollingContentsLayer()->platformLayer(), IntSize(renderLayer->scrollWidth(), renderLayer->scrollHeight()));
}
}
void RenderLayerCompositor::getFixedPositionLayerSizing(RenderLayer* layer, ScrollingLayerSizing& sizing, FloatRect& bounds, FloatSize& alignmentOffset)
{
ASSERT(layer->isComposited());
GraphicsLayer* graphicsLayer = layer->backing()->graphicsLayer();
FloatRect fixedOffsetBounds(graphicsLayer->position(), graphicsLayer->size());
alignmentOffset = graphicsLayer->pixelAlignmentOffset();
FrameView* frameView = m_renderView->frameView();
IntRect positionedObjectsRect = frameView->customFixedPositionLayoutRect();
RenderObject* renderer = layer->renderer();
Length left = renderer->style()->left();
Length right = renderer->style()->right();
Length top = renderer->style()->top();
Length bottom = renderer->style()->bottom();
bounds = FloatRect(FloatPoint(), fixedOffsetBounds.size());
sizing = ScrollingLayerSizingNone;
if (!left.isAuto()) {
sizing |= ScrollingLayerAnchorLeft;
bounds.setX(fixedOffsetBounds.x() - positionedObjectsRect.x());
}
if (!right.isAuto()) {
sizing |= ScrollingLayerAnchorRight;
if (!(sizing & ScrollingLayerAnchorLeft))
bounds.setX(positionedObjectsRect.maxX() - fixedOffsetBounds.maxX());
}
if (!top.isAuto()) {
sizing |= ScrollingLayerAnchorTop;
bounds.setY(fixedOffsetBounds.y() - positionedObjectsRect.y());
}
if (!bottom.isAuto()) {
sizing |= ScrollingLayerAnchorBottom;
if (!(sizing & ScrollingLayerAnchorTop))
bounds.setY(positionedObjectsRect.maxY() - fixedOffsetBounds.maxY());
}
if (!(sizing & (ScrollingLayerAnchorLeft | ScrollingLayerAnchorRight))) {
sizing |= ScrollingLayerAnchorLeft;
bounds.setX(fixedOffsetBounds.x() - positionedObjectsRect.x());
}
if (!(sizing & (ScrollingLayerAnchorTop | ScrollingLayerAnchorBottom))) {
sizing |= ScrollingLayerAnchorTop;
bounds.setY(fixedOffsetBounds.y() - positionedObjectsRect.y());
}
}
void RenderLayerCompositor::registerOrUpdateFixedPositionLayer(RenderLayer* layer)
{
ASSERT(m_renderView->hasCustomFixedPosition(layer->renderer()));
ASSERT(m_fixedPositionLayers.contains(layer));
ASSERT(layer->isComposited());
ChromeClient* chromeClient = this->chromeClient();
if (!chromeClient)
return;
ScrollingLayerSizing sizing;
FloatRect bounds;
FloatSize alignmentOffset;
getFixedPositionLayerSizing(layer, sizing, bounds, alignmentOffset);
chromeClient->addOrUpdateFixedPositionLayer(layer->backing()->graphicsLayer()->platformLayer(), sizing, bounds, alignmentOffset, enclosingCompositorFlushingLayers());
}
void RenderLayerCompositor::unregisterFixedPositionLayer(RenderLayer* layer)
{
ASSERT(m_fixedPositionLayers.contains(layer));
if (ChromeClient* chromeClient = this->chromeClient()) {
ASSERT(layer->isComposited());
chromeClient->removeFixedPositionLayer(layer->backing()->graphicsLayer()->platformLayer(), enclosingCompositorFlushingLayers());
}
}
void RenderLayerCompositor::registerAllFixedPositionLayers()
{
HashSet<RenderLayer*>::const_iterator end = m_fixedPositionLayers.end();
for (HashSet<RenderLayer*>::const_iterator it = m_fixedPositionLayers.begin(); it != end; ++it)
registerOrUpdateFixedPositionLayer(*it);
}
void RenderLayerCompositor::unregisterAllFixedPositionLayers()
{
HashSet<RenderLayer*>::const_iterator end = m_fixedPositionLayers.end();
for (HashSet<RenderLayer*>::const_iterator it = m_fixedPositionLayers.begin(); it != end; ++it)
unregisterFixedPositionLayer(*it);
}
void RenderLayerCompositor::registerAllScrollingLayers()
{
ChromeClient* chromeClient = this->chromeClient();
if (!chromeClient)
return;
HashSet<RenderLayer*>::const_iterator end = m_scrollingLayers.end();
for (HashSet<RenderLayer*>::const_iterator it = m_scrollingLayers.begin(); it != end; ++it) {
RenderLayer* layer = *it;
RenderLayerBacking* backing = layer->backing();
ASSERT(backing);
chromeClient->addOrUpdateScrollingLayer(layer->renderer()->node(), backing->scrollingLayer()->platformLayer(), backing->scrollingContentsLayer()->platformLayer(), IntSize(layer->scrollWidth(), layer->scrollHeight()));
}
}
void RenderLayerCompositor::unregisterAllScrollingLayers()
{
ChromeClient* chromeClient = this->chromeClient();
if (!chromeClient)
return;
HashSet<RenderLayer*>::const_iterator end = m_scrollingLayers.end();
for (HashSet<RenderLayer*>::const_iterator it = m_scrollingLayers.begin(); it != end; ++it) {
RenderLayer* layer = *it;
RenderLayerBacking* backing = layer->backing();
ASSERT(backing);
chromeClient->removeScrollingLayer(layer->renderer()->node(), backing->scrollingLayer()->platformLayer(), backing->scrollingContentsLayer()->platformLayer());
}
}
void RenderLayerCompositor::scrollingLayerAddedOrUpdated(RenderLayer* layer, PlatformLayer* scrollingLayer, PlatformLayer* contentsLayer, const IntSize& scrollSize)
{
m_scrollingLayers.add(layer);
ASSERT(!m_renderView->document()->inPageCache());
if (ChromeClient* chromeClient = this->chromeClient())
chromeClient->addOrUpdateScrollingLayer(layer->renderer()->node(), scrollingLayer, contentsLayer, scrollSize);
}
void RenderLayerCompositor::scrollingLayerRemoved(RenderLayer* layer, PlatformLayer* scrollingLayer, PlatformLayer* contentsLayer)
{
m_scrollingLayers.remove(layer);
if (m_renderView->document()->inPageCache())
return;
if (ChromeClient* chromeClient = this->chromeClient())
chromeClient->removeScrollingLayer(layer->renderer()->node(), scrollingLayer, contentsLayer);
}
}
#endif // USE(ACCELERATED_COMPOSITING)