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/*
* Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2014 Google 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 "core/layout/compositing/GraphicsLayerTreeBuilder.h"
#include "core/html/HTMLMediaElement.h"
#include "core/html/HTMLVideoElement.h"
#include "core/layout/LayoutPart.h"
#include "core/layout/compositing/CompositedLayerMapping.h"
#include "core/layout/compositing/PaintLayerCompositor.h"
#include "core/paint/PaintLayer.h"
namespace blink {
GraphicsLayerTreeBuilder::GraphicsLayerTreeBuilder() {}
GraphicsLayerTreeBuilder::~GraphicsLayerTreeBuilder() {}
static bool shouldAppendLayer(const PaintLayer& layer) {
Node* node = layer.layoutObject()->node();
if (node && isHTMLVideoElement(*node)) {
HTMLVideoElement* element = toHTMLVideoElement(node);
if (element->isFullscreen() && element->usesOverlayFullscreenVideo())
return false;
}
return true;
}
void GraphicsLayerTreeBuilder::rebuild(PaintLayer& layer, AncestorInfo info) {
// 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 paint invalidation if necessary.
layer.stackingNode()->updateLayerListsIfNeeded();
const bool hasCompositedLayerMapping = layer.hasCompositedLayerMapping();
CompositedLayerMapping* currentCompositedLayerMapping =
layer.compositedLayerMapping();
// If this layer has a compositedLayerMapping, then that is where we place
// subsequent children GraphicsLayers. Otherwise children continue to append
// to the child list of the enclosing layer.
GraphicsLayerVector layerChildren;
AncestorInfo infoForChildren(info);
if (hasCompositedLayerMapping) {
infoForChildren.childLayersOfEnclosingCompositedLayer = &layerChildren;
infoForChildren.enclosingCompositedLayer = &layer;
}
#if DCHECK_IS_ON()
LayerListMutationDetector mutationChecker(layer.stackingNode());
#endif
if (layer.stackingNode()->isStackingContext()) {
PaintLayerStackingNodeIterator iterator(*layer.stackingNode(),
NegativeZOrderChildren);
while (PaintLayerStackingNode* curNode = iterator.next())
rebuild(*curNode->layer(), infoForChildren);
// If a negative z-order child is compositing, we get a foreground layer
// which needs to get parented.
if (hasCompositedLayerMapping &&
currentCompositedLayerMapping->foregroundLayer())
infoForChildren.childLayersOfEnclosingCompositedLayer->push_back(
currentCompositedLayerMapping->foregroundLayer());
}
PaintLayerStackingNodeIterator iterator(
*layer.stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
while (PaintLayerStackingNode* curNode = iterator.next())
rebuild(*curNode->layer(), infoForChildren);
if (hasCompositedLayerMapping) {
bool parented = false;
if (layer.layoutObject()->isLayoutPart())
parented = PaintLayerCompositor::attachFrameContentLayersToIframeLayer(
toLayoutPart(layer.layoutObject()));
if (!parented)
currentCompositedLayerMapping->setSublayers(layerChildren);
if (shouldAppendLayer(layer))
info.childLayersOfEnclosingCompositedLayer->push_back(
currentCompositedLayerMapping->childForSuperlayers());
}
if (layer.scrollParent() &&
layer.scrollParent()->hasCompositedLayerMapping() &&
layer.scrollParent()
->compositedLayerMapping()
->needsToReparentOverflowControls() &&
layer.scrollParent()->getScrollableArea()->topmostScrollChild() == &layer)
info.childLayersOfEnclosingCompositedLayer->push_back(
layer.scrollParent()
->compositedLayerMapping()
->detachLayerForOverflowControls(*info.enclosingCompositedLayer));
}
} // namespace blink
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