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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/rendering/compositing/CompositingInputsUpdater.h"
#include "core/rendering/RenderBlock.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/compositing/CompositedLayerMapping.h"
namespace WebCore {
CompositingInputsUpdater::CompositingInputsUpdater(RenderLayer* rootRenderLayer)
: m_geometryMap(UseTransforms)
, m_rootRenderLayer(rootRenderLayer)
{
rootRenderLayer->updateDescendantDependentFlags();
}
CompositingInputsUpdater::~CompositingInputsUpdater()
{
}
void CompositingInputsUpdater::update(RenderLayer* layer, UpdateType updateType, AncestorInfo info)
{
if (!layer->childNeedsCompositingInputsUpdate() && updateType != ForceUpdate)
return;
m_geometryMap.pushMappingsToAncestor(layer, layer->parent());
if (layer->hasCompositedLayerMapping())
info.enclosingCompositedLayer = layer;
if (layer->needsCompositingInputsUpdate()) {
if (info.enclosingCompositedLayer)
info.enclosingCompositedLayer->compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
updateType = ForceUpdate;
}
if (updateType == ForceUpdate) {
RenderLayer::CompositingInputs properties;
if (!layer->isRootLayer()) {
properties.clippedAbsoluteBoundingBox = enclosingIntRect(m_geometryMap.absoluteRect(layer->boundingBoxForCompositingOverlapTest()));
// FIXME: Setting the absBounds to 1x1 instead of 0x0 makes very little sense,
// but removing this code will make JSGameBench sad.
// See https://codereview.chromium.org/13912020/
if (properties.clippedAbsoluteBoundingBox.isEmpty())
properties.clippedAbsoluteBoundingBox.setSize(IntSize(1, 1));
IntRect clipRect = pixelSnappedIntRect(layer->clipper().backgroundClipRect(ClipRectsContext(m_rootRenderLayer, AbsoluteClipRects)).rect());
properties.clippedAbsoluteBoundingBox.intersect(clipRect);
const RenderLayer* parent = layer->parent();
properties.opacityAncestor = parent->isTransparent() ? parent : parent->compositingInputs().opacityAncestor;
properties.transformAncestor = parent->transform() ? parent : parent->compositingInputs().transformAncestor;
properties.filterAncestor = parent->hasFilter() ? parent : parent->compositingInputs().filterAncestor;
if (layer->renderer()->isOutOfFlowPositioned() && info.ancestorScrollingLayer && !layer->subtreeIsInvisible()) {
const RenderObject* container = layer->renderer()->containingBlock();
const RenderObject* scroller = info.ancestorScrollingLayer->renderer();
properties.isUnclippedDescendant = scroller != container && scroller->isDescendantOf(container);
}
}
layer->updateCompositingInputs(properties);
}
if (layer->scrollsOverflow())
info.ancestorScrollingLayer = layer;
for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
update(child, updateType, info);
m_geometryMap.popMappingsToAncestor(layer->parent());
layer->clearChildNeedsCompositingInputsUpdate();
}
#if ASSERT_ENABLED
void CompositingInputsUpdater::assertNeedsCompositingInputsUpdateBitsCleared(RenderLayer* layer)
{
ASSERT(!layer->childNeedsCompositingInputsUpdate());
ASSERT(!layer->needsCompositingInputsUpdate());
for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
assertNeedsCompositingInputsUpdateBitsCleared(child);
}
#endif
} // namespace WebCore
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