| /* |
| * Copyright (C) 2009 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" |
| |
| #if USE(ACCELERATED_COMPOSITING) |
| #include "RenderLayerCompositor.h" |
| |
| #include "AnimationController.h" |
| #include "ChromeClient.h" |
| #include "CSSPropertyNames.h" |
| #include "Frame.h" |
| #include "FrameView.h" |
| #include "GraphicsLayer.h" |
| #include "HitTestRequest.h" |
| #include "HitTestResult.h" |
| #include "Page.h" |
| #include "RenderLayerBacking.h" |
| #include "RenderVideo.h" |
| #include "RenderView.h" |
| #include "Settings.h" |
| |
| #if PROFILE_LAYER_REBUILD |
| #include <wtf/CurrentTime.h> |
| #endif |
| |
| #ifndef NDEBUG |
| #include "CString.h" |
| #include "RenderTreeAsText.h" |
| #endif |
| |
| #if ENABLE(3D_RENDERING) |
| // This symbol is used to determine from a script whether 3D rendering is enabled (via 'nm'). |
| bool WebCoreHas3DRendering = true; |
| #endif |
| |
| namespace WebCore { |
| |
| 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_rootPlatformLayer(0) |
| , m_hasAcceleratedCompositing(true) |
| , m_compositingConsultsOverlap(true) |
| , m_compositing(false) |
| , m_rootLayerAttached(false) |
| , m_compositingLayersNeedRebuild(false) |
| #if PROFILE_LAYER_REBUILD |
| , m_rootLayerUpdateCount(0) |
| #endif // PROFILE_LAYER_REBUILD |
| { |
| } |
| |
| RenderLayerCompositor::~RenderLayerCompositor() |
| { |
| ASSERT(!m_rootLayerAttached); |
| delete m_rootPlatformLayer; |
| } |
| |
| void RenderLayerCompositor::enableCompositingMode(bool enable /* = true */) |
| { |
| if (enable != m_compositing) { |
| m_compositing = enable; |
| |
| // We never go out of compositing mode for a given page, |
| // but if all the layers disappear, we'll just be left with |
| // the empty root layer, which has minimal overhead. |
| if (m_compositing) |
| ensureRootPlatformLayer(); |
| else |
| destroyRootPlatformLayer(); |
| } |
| } |
| |
| void RenderLayerCompositor::cacheAcceleratedCompositingEnabledFlag() |
| { |
| bool hasAcceleratedCompositing = false; |
| if (Settings* settings = m_renderView->document()->settings()) |
| hasAcceleratedCompositing = settings->acceleratedCompositingEnabled(); |
| |
| if (hasAcceleratedCompositing != m_hasAcceleratedCompositing) |
| setCompositingLayersNeedRebuild(); |
| |
| m_hasAcceleratedCompositing = hasAcceleratedCompositing; |
| } |
| |
| void RenderLayerCompositor::setCompositingLayersNeedRebuild(bool needRebuild) |
| { |
| if (inCompositingMode()) |
| m_compositingLayersNeedRebuild = needRebuild; |
| } |
| |
| void RenderLayerCompositor::scheduleSync() |
| { |
| Frame* frame = m_renderView->frameView()->frame(); |
| Page* page = frame ? frame->page() : 0; |
| if (!page) |
| return; |
| |
| page->chrome()->client()->scheduleCompositingLayerSync(); |
| } |
| |
| void RenderLayerCompositor::updateCompositingLayers(RenderLayer* updateRoot) |
| { |
| // When m_compositingConsultsOverlap is true, then layer positions affect compositing, |
| // so we can only bail here when we're not looking at overlap. |
| if (!m_compositingLayersNeedRebuild && !m_compositingConsultsOverlap) |
| return; |
| |
| ASSERT(inCompositingMode()); |
| |
| bool needLayerRebuild = m_compositingLayersNeedRebuild; |
| if (!updateRoot) { |
| // Only clear the flag if we're updating the entire hierarchy. |
| m_compositingLayersNeedRebuild = false; |
| updateRoot = rootRenderLayer(); |
| } |
| |
| #if PROFILE_LAYER_REBUILD |
| ++m_rootLayerUpdateCount; |
| |
| double startTime = WTF::currentTime(); |
| #endif |
| |
| // Go through the layers in presentation order, so that we can compute which |
| // RLs need compositing layers. |
| // FIXME: we could maybe do this in one pass, but the parenting logic would be more |
| // complex. |
| { |
| CompositingState compState(updateRoot); |
| bool layersChanged; |
| if (m_compositingConsultsOverlap) { |
| OverlapMap overlapTestRequestMap; |
| computeCompositingRequirements(updateRoot, &overlapTestRequestMap, compState, layersChanged); |
| } else |
| computeCompositingRequirements(updateRoot, 0, compState, layersChanged); |
| |
| needLayerRebuild |= layersChanged; |
| } |
| |
| // Now create and parent the compositing layers. |
| { |
| CompositingState compState(updateRoot); |
| rebuildCompositingLayerTree(updateRoot, compState, needLayerRebuild); |
| } |
| |
| #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(); |
| |
| // 3D transforms turn off the testing of overlap. |
| if (requiresCompositingForTransform(layer->renderer())) |
| setCompositingConsultsOverlap(false); |
| |
| if (!layer->backing()) { |
| |
| // If we need to repaint, do so before making backing |
| if (shouldRepaint == CompositingChangeRepaintNow) |
| repaintOnCompositingChange(layer); |
| |
| layer->ensureBacking(); |
| layerChanged = true; |
| } |
| } else { |
| if (layer->backing()) { |
| layer->clearBacking(); |
| layerChanged = true; |
| |
| // The layer's cached repaints rects are relative to the repaint container, so change when |
| // compositing changes; we need to update them here. |
| layer->computeRepaintRects(); |
| |
| // If we need to repaint, do so now that we've removed the backing |
| if (shouldRepaint == CompositingChangeRepaintNow) |
| repaintOnCompositingChange(layer); |
| } |
| } |
| |
| #if ENABLE(VIDEO) |
| if (layerChanged && layer->renderer()->isVideo()) { |
| // If it's a video, give the media player a chance to hook up to the layer. |
| RenderVideo* video = static_cast<RenderVideo*>(layer->renderer()); |
| video->acceleratedRenderingStateChanged(); |
| } |
| #endif |
| return layerChanged; |
| } |
| |
| bool RenderLayerCompositor::updateLayerCompositingState(RenderLayer* layer, CompositingChangeRepaint shouldRepaint) |
| { |
| bool layerChanged = updateBacking(layer, shouldRepaint); |
| |
| // See if we need content or clipping layers. Methods called here should assume |
| // that the compositing state of descendant layers has not been updated yet. |
| if (layer->backing() && layer->backing()->updateGraphicsLayerConfiguration()) |
| layerChanged = true; |
| |
| return layerChanged; |
| } |
| |
| void RenderLayerCompositor::repaintOnCompositingChange(RenderLayer* layer) |
| { |
| RenderBoxModelObject* repaintContainer = layer->renderer()->containerForRepaint(); |
| if (!repaintContainer) |
| repaintContainer = m_renderView; |
| |
| layer->repaintIncludingNonCompositingDescendants(repaintContainer); |
| if (repaintContainer == m_renderView) { |
| // The contents of this layer may be moving between the window |
| // and a GraphicsLayer, so we need to make sure the window system |
| // synchronizes those changes on the screen. |
| m_renderView->frameView()->setNeedsOneShotDrawingSynchronization(); |
| } |
| } |
| |
| // The bounds of the GraphicsLayer created for a compositing layer is the union of the bounds of all the descendant |
| // RenderLayers that are rendered by the composited RenderLayer. |
| IntRect RenderLayerCompositor::calculateCompositedBounds(const RenderLayer* layer, const RenderLayer* ancestorLayer) |
| { |
| if (!layer->isSelfPaintingLayer()) |
| return IntRect(); |
| |
| IntRect boundingBoxRect, unionBounds; |
| boundingBoxRect = unionBounds = layer->localBoundingBox(); |
| |
| if (layer->renderer()->hasOverflowClip() || layer->renderer()->hasMask()) { |
| int ancestorRelX = 0, ancestorRelY = 0; |
| layer->convertToLayerCoords(ancestorLayer, ancestorRelX, ancestorRelY); |
| boundingBoxRect.move(ancestorRelX, ancestorRelY); |
| return boundingBoxRect; |
| } |
| |
| 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()) { |
| 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* /*parent*/, RenderLayer* /*child*/) |
| { |
| setCompositingLayersNeedRebuild(); |
| } |
| |
| void RenderLayerCompositor::layerWillBeRemoved(RenderLayer* parent, RenderLayer* child) |
| { |
| if (!child->isComposited() || parent->renderer()->documentBeingDestroyed()) |
| return; |
| |
| 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); |
| |
| // The contents of this layer may be moving from a GraphicsLayer to the window, |
| // so we need to make sure the window system synchronizes those changes on the screen. |
| 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()) |
| 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(); |
| 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; |
| } |
| |
| // Recurse through the layers in z-index and overflow order (which is equivalent to painting order) |
| // For the z-order children of a compositing layer: |
| // If a child layers has a compositing layer, then all subsequent layers must |
| // be compositing in order to render above that layer. |
| // |
| // If a child in the negative z-order list is compositing, then the layer itself |
| // must be compositing so that its contents render over that child. |
| // This implies that its positive z-index children must also be compositing. |
| // |
| void RenderLayerCompositor::computeCompositingRequirements(RenderLayer* layer, OverlapMap* overlapMap, struct CompositingState& compositingState, bool& layersChanged) |
| { |
| layer->updateLayerPosition(); |
| layer->updateZOrderLists(); |
| layer->updateNormalFlowList(); |
| |
| // Clear the flag |
| layer->setHasCompositingDescendant(false); |
| |
| bool mustOverlapCompositedLayers = compositingState.m_subtreeIsCompositing; |
| |
| bool haveComputedBounds = false; |
| IntRect absBounds; |
| if (overlapMap && mustOverlapCompositedLayers) { |
| // If we're testing for overlap, we only need to composite if we overlap something that is already composited. |
| absBounds = layer->renderer()->localToAbsoluteQuad(FloatRect(layer->localBoundingBox())).enclosingBoundingBox(); |
| haveComputedBounds = true; |
| mustOverlapCompositedLayers &= overlapsCompositedLayers(*overlapMap, absBounds); |
| } |
| |
| layer->setMustOverlapCompositedLayers(mustOverlapCompositedLayers); |
| |
| // The children of this layer don't need to composite, unless there is |
| // a compositing layer among them, so start by inheriting the compositing |
| // ancestor with m_subtreeIsCompositing set to false. |
| CompositingState childState(compositingState.m_compositingAncestor); |
| #ifndef NDEBUG |
| ++childState.m_depth; |
| #endif |
| |
| const bool willBeComposited = needsToBeComposited(layer); |
| if (willBeComposited) { |
| // Tell the parent it has compositing descendants. |
| compositingState.m_subtreeIsCompositing = true; |
| // This layer now acts as the ancestor for kids. |
| childState.m_compositingAncestor = layer; |
| if (overlapMap) |
| addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds); |
| } |
| |
| #if ENABLE(VIDEO) |
| // Video is special. It's a replaced element with a content layer, but has shadow content |
| // for the controller that must render in front. Without this, the controls fail to show |
| // when the video element is a stacking context (e.g. due to opacity or transform). |
| 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 we have to make a layer for this child, make one now so we can have a contents layer |
| // (since we need to ensure that the -ve z-order child renders underneath our contents). |
| if (childState.m_subtreeIsCompositing) { |
| // make layer compositing |
| layer->setMustOverlapCompositedLayers(true); |
| childState.m_compositingAncestor = layer; |
| if (overlapMap) |
| addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds); |
| } |
| } |
| } |
| } |
| |
| 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 we have a software transform, and we have layers under us, we need to also |
| // be composited. Also, if we have opacity < 1, then we need to be a layer so that |
| // the child layers are opaque, then rendered with opacity on this layer. |
| if (childState.m_subtreeIsCompositing && |
| (layer->renderer()->hasTransform() || layer->renderer()->style()->opacity() < 1)) { |
| layer->setMustOverlapCompositedLayers(true); |
| if (overlapMap) |
| addToOverlapMap(*overlapMap, layer, absBounds, haveComputedBounds); |
| } |
| |
| // Subsequent layers in the parent stacking context also need to composite. |
| if (childState.m_subtreeIsCompositing) |
| compositingState.m_subtreeIsCompositing = true; |
| |
| // If the layer is going into compositing mode, repaint its old location. |
| if (!layer->isComposited() && needsToBeComposited(layer)) |
| repaintOnCompositingChange(layer); |
| |
| // Set the flag to say that this SC has compositing children. |
| // this can affect the answer to needsToBeComposited() when clipping, |
| // but that's ok here. |
| layer->setHasCompositingDescendant(childState.m_subtreeIsCompositing); |
| |
| // Update backing now, so that we can use isComposited() reliably during tree traversal in rebuildCompositingLayerTree(). |
| if (updateBacking(layer, CompositingChangeRepaintNow)) |
| layersChanged = true; |
| } |
| |
| void RenderLayerCompositor::setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer) |
| { |
| ASSERT(childLayer->isComposited()); |
| |
| // It's possible to be called with a parent that isn't yet composited when we're doing |
| // partial updates as required by painting or hit testing. Just bail in that case; |
| // we'll do a full layer update soon. |
| 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(); |
| } |
| |
| void RenderLayerCompositor::parentInRootLayer(RenderLayer* layer) |
| { |
| ASSERT(layer->isComposited()); |
| |
| GraphicsLayer* layerAnchor = layer->backing()->childForSuperlayers(); |
| |
| if (layerAnchor->parent() != m_rootPlatformLayer) { |
| layerAnchor->removeFromParent(); |
| if (m_rootPlatformLayer) |
| m_rootPlatformLayer->addChild(layerAnchor); |
| } |
| } |
| |
| #if ENABLE(VIDEO) |
| bool RenderLayerCompositor::canAccelerateVideoRendering(RenderVideo* o) const |
| { |
| // FIXME: ideally we need to look at all ancestors for mask or video. But for now, |
| // just bail on the obvious cases. |
| if (o->hasMask() || o->hasReflection() || !m_hasAcceleratedCompositing) |
| return false; |
| |
| return o->supportsAcceleratedRendering(); |
| } |
| #endif |
| |
| void RenderLayerCompositor::rebuildCompositingLayerTree(RenderLayer* layer, struct CompositingState& compositingState, bool updateHierarchy) |
| { |
| // Make the layer compositing if necessary, and set up clipping and content layers. |
| // Note that we can only do work here that is independent of whether the descendant layers |
| // have been processed. computeCompositingRequirements() will already have done the repaint if necessary. |
| RenderLayerBacking* layerBacking = layer->backing(); |
| if (layerBacking) { |
| // The compositing state of all our children has been updated already, so now |
| // we can compute and cache the composited bounds for this layer. |
| layerBacking->updateCompositedBounds(); |
| layerBacking->updateGraphicsLayerConfiguration(); |
| layerBacking->updateGraphicsLayerGeometry(); |
| |
| if (!layer->parent()) |
| updateRootLayerPosition(); |
| |
| // FIXME: make this more incremental |
| if (updateHierarchy) |
| layerBacking->parentForSublayers()->removeAllChildren(); |
| } |
| |
| // host the document layer in the RenderView's root layer |
| if (updateHierarchy && layer->isRootLayer() && layer->isComposited()) |
| parentInRootLayer(layer); |
| |
| CompositingState childState = compositingState; |
| if (layer->isComposited()) |
| childState.m_compositingAncestor = layer; |
| |
| #ifndef NDEBUG |
| ++childState.m_depth; |
| #endif |
| |
| // The children of this stacking context don't need to composite, unless there is |
| // a compositing layer among them, so start by assuming false. |
| 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, updateHierarchy); |
| if (updateHierarchy && curLayer->isComposited()) |
| setCompositingParent(curLayer, childState.m_compositingAncestor); |
| } |
| } |
| |
| if (updateHierarchy && layerBacking && layerBacking->foregroundLayer()) { |
| // we only have a contents layer if we have an m_layer |
| layerBacking->foregroundLayer()->removeFromParent(); |
| |
| GraphicsLayer* hostingLayer = layerBacking->clippingLayer() ? layerBacking->clippingLayer() : layerBacking->graphicsLayer(); |
| hostingLayer->addChild(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, updateHierarchy); |
| if (updateHierarchy && curLayer->isComposited()) |
| setCompositingParent(curLayer, childState.m_compositingAncestor); |
| } |
| } |
| |
| 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, updateHierarchy); |
| if (updateHierarchy && curLayer->isComposited()) |
| setCompositingParent(curLayer, childState.m_compositingAncestor); |
| } |
| } |
| } |
| } |
| |
| |
| // Recurs down the RenderLayer tree until its finds the compositing descendants of compositingAncestor and updates their geometry. |
| void RenderLayerCompositor::updateCompositingDescendantGeometry(RenderLayer* compositingAncestor, RenderLayer* layer, RenderLayerBacking::UpdateDepth updateDepth) |
| { |
| if (layer != compositingAncestor) { |
| if (RenderLayerBacking* layerBacking = layer->backing()) { |
| layerBacking->updateCompositedBounds(); |
| layerBacking->updateGraphicsLayerGeometry(); |
| if (updateDepth == RenderLayerBacking::CompositingChildren) |
| return; |
| } |
| } |
| |
| 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, 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, 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, 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::rootPlatformLayer() const |
| { |
| return m_rootPlatformLayer; |
| } |
| |
| void RenderLayerCompositor::didMoveOnscreen() |
| { |
| if (!m_rootPlatformLayer) |
| return; |
| |
| Frame* frame = m_renderView->frameView()->frame(); |
| Page* page = frame ? frame->page() : 0; |
| if (!page) |
| return; |
| |
| page->chrome()->client()->attachRootGraphicsLayer(frame, m_rootPlatformLayer); |
| m_rootLayerAttached = true; |
| } |
| |
| void RenderLayerCompositor::willMoveOffscreen() |
| { |
| if (!m_rootPlatformLayer || !m_rootLayerAttached) |
| return; |
| |
| Frame* frame = m_renderView->frameView()->frame(); |
| Page* page = frame ? frame->page() : 0; |
| if (!page) |
| return; |
| |
| page->chrome()->client()->attachRootGraphicsLayer(frame, 0); |
| m_rootLayerAttached = false; |
| } |
| |
| void RenderLayerCompositor::updateRootLayerPosition() |
| { |
| if (m_rootPlatformLayer) |
| m_rootPlatformLayer->setSize(FloatSize(m_renderView->overflowWidth(), m_renderView->overflowHeight())); |
| } |
| |
| void RenderLayerCompositor::didStartAcceleratedAnimation() |
| { |
| // If an accelerated animation or transition runs, we have to turn off overlap checking because |
| // we don't do layout for every frame, but we have to ensure that the layering is |
| // correct between the animating object and other objects on the page. |
| setCompositingConsultsOverlap(false); |
| } |
| |
| bool RenderLayerCompositor::has3DContent() const |
| { |
| return layerHas3DContent(rootRenderLayer()); |
| } |
| |
| bool RenderLayerCompositor::needsToBeComposited(const RenderLayer* layer) const |
| { |
| if (!m_hasAcceleratedCompositing || !layer->isSelfPaintingLayer()) |
| return false; |
| |
| return requiresCompositingLayer(layer) || layer->mustOverlapCompositedLayers(); |
| } |
| |
| // Note: this specifies whether the RL needs a compositing layer for intrinsic reasons. |
| // Use needsToBeComposited() to determine if a RL actually needs a compositing layer. |
| // static |
| bool RenderLayerCompositor::requiresCompositingLayer(const RenderLayer* layer) const |
| { |
| // The root layer always has a compositing layer, but it may not have backing. |
| return (inCompositingMode() && layer->isRootLayer()) || |
| requiresCompositingForTransform(layer->renderer()) || |
| requiresCompositingForVideo(layer->renderer()) || |
| layer->renderer()->style()->backfaceVisibility() == BackfaceVisibilityHidden || |
| clipsCompositingDescendants(layer) || |
| requiresCompositingForAnimation(layer->renderer()); |
| } |
| |
| // Return true if the given layer has some ancestor in the RenderLayer hierarchy that clips, |
| // up to the enclosing compositing ancestor. This is required because compositing layers are parented |
| // according to the z-order hierarchy, yet clipping goes down the renderer hierarchy. |
| // Thus, a RenderLayer can be clipped by a RenderLayer that is an ancestor in the renderer hierarchy, |
| // but a sibling in the z-order hierarchy. |
| bool RenderLayerCompositor::clippedByAncestor(RenderLayer* layer) const |
| { |
| if (!layer->isComposited() || !layer->parent()) |
| return false; |
| |
| RenderLayer* compositingAncestor = layer->ancestorCompositingLayer(); |
| if (!compositingAncestor) |
| return false; |
| |
| // If the compositingAncestor clips, that will be taken care of by clipsCompositingDescendants(), |
| // so we only care about clipping between its first child that is our ancestor (the computeClipRoot), |
| // and layer. |
| 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; |
| |
| ClipRects parentRects; |
| layer->parentClipRects(computeClipRoot, parentRects, true); |
| |
| return parentRects.overflowClipRect() != ClipRects::infiniteRect(); |
| } |
| |
| // Return true if the given layer is a stacking context and has compositing child |
| // layers that it needs to clip. In this case we insert a clipping GraphicsLayer |
| // into the hierarchy between this layer and its children in the z-order hierarchy. |
| bool RenderLayerCompositor::clipsCompositingDescendants(const RenderLayer* layer) const |
| { |
| // FIXME: need to look at hasClip() too eventually |
| return layer->hasCompositingDescendant() && |
| layer->renderer()->hasOverflowClip(); |
| } |
| |
| bool RenderLayerCompositor::requiresCompositingForTransform(RenderObject* renderer) const |
| { |
| RenderStyle* style = renderer->style(); |
| // Note that we ask the renderer if it has a transform, because the style may have transforms, |
| // but the renderer may be an inline that doesn't suppport them. |
| return renderer->hasTransform() && (style->transform().has3DOperation() || style->transformStyle3D() == TransformStyle3DPreserve3D || style->hasPerspective()); |
| } |
| |
| bool RenderLayerCompositor::requiresCompositingForVideo(RenderObject* renderer) const |
| { |
| #if ENABLE(VIDEO) |
| if (renderer->isVideo()) { |
| RenderVideo* video = static_cast<RenderVideo*>(renderer); |
| return canAccelerateVideoRendering(video); |
| } |
| #endif |
| return false; |
| } |
| |
| bool RenderLayerCompositor::requiresCompositingForAnimation(RenderObject* renderer) const |
| { |
| if (AnimationController* animController = renderer->animation()) { |
| return (animController->isAnimatingPropertyOnRenderer(renderer, CSSPropertyOpacity) && inCompositingMode()) |
| || animController->isAnimatingPropertyOnRenderer(renderer, CSSPropertyWebkitTransform); |
| } |
| return false; |
| } |
| |
| // If an element has negative z-index children, those children render in front of the |
| // layer background, so we need an extra 'contents' layer for the foreground of the layer |
| // object. |
| bool RenderLayerCompositor::needsContentsCompositingLayer(const RenderLayer* layer) const |
| { |
| return (layer->m_negZOrderList && layer->m_negZOrderList->size() > 0); |
| } |
| |
| void RenderLayerCompositor::ensureRootPlatformLayer() |
| { |
| if (m_rootPlatformLayer) |
| return; |
| |
| m_rootPlatformLayer = GraphicsLayer::createGraphicsLayer(0); |
| m_rootPlatformLayer->setSize(FloatSize(m_renderView->overflowWidth(), m_renderView->overflowHeight())); |
| m_rootPlatformLayer->setPosition(FloatPoint(0, 0)); |
| // The root layer does flipping if we need it on this platform. |
| m_rootPlatformLayer->setGeometryOrientation(GraphicsLayer::compositingCoordinatesOrientation()); |
| |
| // Need to clip to prevent transformed content showing outside this frame |
| m_rootPlatformLayer->setMasksToBounds(true); |
| |
| didMoveOnscreen(); |
| } |
| |
| void RenderLayerCompositor::destroyRootPlatformLayer() |
| { |
| if (!m_rootPlatformLayer) |
| return; |
| |
| willMoveOffscreen(); |
| delete m_rootPlatformLayer; |
| m_rootPlatformLayer = 0; |
| } |
| |
| 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; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // USE(ACCELERATED_COMPOSITING) |
| |
