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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_updater.h"
#include "third_party/blink/renderer/core/html/media/html_media_element.h"
#include "third_party/blink/renderer/core/inspector/inspector_trace_events.h"
#include "third_party/blink/renderer/core/layout/layout_block.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"
#include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
class GraphicsLayerUpdater::UpdateContext {
public:
UpdateContext()
: compositing_stacking_context_(nullptr),
compositing_ancestor_(nullptr) {}
UpdateContext(const UpdateContext& other, const PaintLayer& layer)
: compositing_stacking_context_(other.compositing_stacking_context_),
compositing_ancestor_(other.CompositingContainer(layer)) {
CompositingState compositing_state = layer.GetCompositingState();
if (compositing_state != kNotComposited &&
compositing_state != kPaintsIntoGroupedBacking) {
compositing_ancestor_ = &layer;
if (layer.GetLayoutObject().StyleRef().IsStackingContext())
compositing_stacking_context_ = &layer;
}
}
const PaintLayer* CompositingContainer(const PaintLayer& layer) const {
const PaintLayer* compositing_container;
if (layer.GetLayoutObject().StyleRef().IsStacked() &&
!layer.IsReplacedNormalFlowStacking()) {
compositing_container = compositing_stacking_context_;
} else if ((layer.Parent() &&
!layer.Parent()->GetLayoutObject().IsLayoutBlock()) ||
layer.GetLayoutObject().IsColumnSpanAll()) {
// In these cases, compositingContainer may escape the normal layer
// hierarchy. Use the slow path to ensure correct result.
// See PaintLayer::containingLayer() for details.
compositing_container =
layer.EnclosingLayerWithCompositedLayerMapping(kExcludeSelf);
} else {
compositing_container = compositing_ancestor_;
}
// We should always get the same result as the slow path.
DCHECK_EQ(compositing_container,
layer.EnclosingLayerWithCompositedLayerMapping(kExcludeSelf));
return compositing_container;
}
const PaintLayer* CompositingStackingContext() const {
return compositing_stacking_context_;
}
private:
const PaintLayer* compositing_stacking_context_;
const PaintLayer* compositing_ancestor_;
};
GraphicsLayerUpdater::GraphicsLayerUpdater() : needs_rebuild_tree_(false) {}
GraphicsLayerUpdater::~GraphicsLayerUpdater() = default;
void GraphicsLayerUpdater::Update(
PaintLayer& layer,
Vector<PaintLayer*>& layers_needing_paint_invalidation) {
TRACE_EVENT0("blink", "GraphicsLayerUpdater::update");
UpdateRecursive(layer, kDoNotForceUpdate, UpdateContext(),
layers_needing_paint_invalidation);
}
void GraphicsLayerUpdater::UpdateRecursive(
PaintLayer& layer,
UpdateType update_type,
const UpdateContext& context,
Vector<PaintLayer*>& layers_needing_paint_invalidation) {
if (layer.HasCompositedLayerMapping()) {
CompositedLayerMapping* mapping = layer.GetCompositedLayerMapping();
if (update_type == kForceUpdate || mapping->NeedsGraphicsLayerUpdate()) {
bool had_scrolling_layer = mapping->ScrollingLayer();
const auto* compositing_container = context.CompositingContainer(layer);
if (mapping->UpdateGraphicsLayerConfiguration(compositing_container)) {
needs_rebuild_tree_ = true;
// Change of existence of scrolling layer affects visual rect offsets of
// descendants via LayoutObject::ScrollAdjustmentForPaintInvalidation().
if (had_scrolling_layer != !!mapping->ScrollingLayer())
layers_needing_paint_invalidation.push_back(&layer);
}
mapping->UpdateGraphicsLayerGeometry(compositing_container,
context.CompositingStackingContext(),
layers_needing_paint_invalidation);
if (PaintLayerScrollableArea* scrollable_area = layer.GetScrollableArea())
scrollable_area->PositionOverflowControls();
update_type = mapping->UpdateTypeForChildren(update_type);
mapping->ClearNeedsGraphicsLayerUpdate();
}
}
UpdateContext child_context(context, layer);
for (PaintLayer* child = layer.FirstChild(); child;
child = child->NextSibling()) {
UpdateRecursive(*child, update_type, child_context,
layers_needing_paint_invalidation);
}
}
#if DCHECK_IS_ON()
void GraphicsLayerUpdater::AssertNeedsToUpdateGraphicsLayerBitsCleared(
PaintLayer& layer) {
if (layer.HasCompositedLayerMapping()) {
layer.GetCompositedLayerMapping()
->AssertNeedsToUpdateGraphicsLayerBitsCleared();
}
for (PaintLayer* child = layer.FirstChild(); child;
child = child->NextSibling())
AssertNeedsToUpdateGraphicsLayerBitsCleared(*child);
}
#endif
} // namespace blink
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