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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 "third_party/blink/renderer/core/paint/compositing/graphics_layer_tree_builder.h"
#include "third_party/blink/renderer/core/html/media/html_media_element.h"
#include "third_party/blink/renderer/core/html/media/html_video_element.h"
#include "third_party/blink/renderer/core/layout/layout_embedded_content.h"
#include "third_party/blink/renderer/core/paint/compositing/composited_layer_mapping.h"
#include "third_party/blink/renderer/core/paint/compositing/paint_layer_compositor.h"
#include "third_party/blink/renderer/core/paint/paint_layer.h"
namespace blink {
GraphicsLayerTreeBuilder::GraphicsLayerTreeBuilder() = default;
GraphicsLayerTreeBuilder::~GraphicsLayerTreeBuilder() = default;
static bool ShouldAppendLayer(const PaintLayer& layer) {
Node* node = layer.GetLayoutObject().GetNode();
if (node && IsHTMLVideoElement(*node)) {
HTMLVideoElement* element = ToHTMLVideoElement(node);
if (element->IsFullscreen() && element->UsesOverlayFullscreenVideo())
return false;
}
return true;
}
void GraphicsLayerTreeBuilder::Rebuild(PaintLayer& layer,
GraphicsLayerVector& child_layers) {
// 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 has_composited_layer_mapping = layer.HasCompositedLayerMapping();
CompositedLayerMapping* current_composited_layer_mapping =
layer.GetCompositedLayerMapping();
// 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 this_layer_children;
GraphicsLayerVector* layer_vector_for_children =
has_composited_layer_mapping ? &this_layer_children : &child_layers;
#if DCHECK_IS_ON()
LayerListMutationDetector mutation_checker(layer.StackingNode());
#endif
if (layer.StackingNode()->IsStackingContext()) {
PaintLayerStackingNodeIterator iterator(*layer.StackingNode(),
kNegativeZOrderChildren);
while (PaintLayerStackingNode* cur_node = iterator.Next())
Rebuild(*cur_node->Layer(), *layer_vector_for_children);
// If a negative z-order child is compositing, we get a foreground layer
// which needs to get parented.
if (has_composited_layer_mapping &&
current_composited_layer_mapping->ForegroundLayer()) {
layer_vector_for_children->push_back(
current_composited_layer_mapping->ForegroundLayer());
}
}
PaintLayerStackingNodeIterator iterator(
*layer.StackingNode(), kNormalFlowChildren | kPositiveZOrderChildren);
while (PaintLayerStackingNode* cur_node = iterator.Next())
Rebuild(*cur_node->Layer(), *layer_vector_for_children);
if (has_composited_layer_mapping) {
bool parented = false;
if (layer.GetLayoutObject().IsLayoutEmbeddedContent()) {
parented = PaintLayerCompositor::AttachFrameContentLayersToIframeLayer(
ToLayoutEmbeddedContent(layer.GetLayoutObject()));
}
if (!parented)
current_composited_layer_mapping->SetSublayers(this_layer_children);
if (ShouldAppendLayer(layer)) {
child_layers.push_back(
current_composited_layer_mapping->ChildForSuperlayers());
}
}
if (layer.ScrollParent() &&
layer.ScrollParent()->HasCompositedLayerMapping() &&
layer.ScrollParent()
->GetCompositedLayerMapping()
->NeedsToReparentOverflowControls() &&
layer.ScrollParent()->GetScrollableArea()->TopmostScrollChild() ==
&layer) {
child_layers.push_back(layer.ScrollParent()
->GetCompositedLayerMapping()
->DetachLayerForOverflowControls());
}
}
} // namespace blink
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