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96 lines
4.2 KiB
C++
96 lines
4.2 KiB
C++
/*
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* Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
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* Copyright (C) 2014 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CompositingLayerAssigner_h
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#define CompositingLayerAssigner_h
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#include "core/rendering/compositing/RenderLayerCompositor.h"
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#include "platform/geometry/IntRect.h"
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#include "platform/geometry/LayoutPoint.h"
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namespace blink {
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class RenderLayer;
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class CompositingLayerAssigner {
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public:
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explicit CompositingLayerAssigner(RenderLayerCompositor*);
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~CompositingLayerAssigner();
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void assign(RenderLayer* updateRoot, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
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bool layersChanged() const { return m_layersChanged; }
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// FIXME: This function should be private. We should remove the one caller
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// once we've fixed the compositing chicken/egg issues.
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CompositingStateTransitionType computeCompositedLayerUpdate(RenderLayer*);
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private:
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struct SquashingState {
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SquashingState()
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: mostRecentMapping(0)
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, hasMostRecentMapping(false)
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, haveAssignedBackingsToEntireSquashingLayerSubtree(false)
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, nextSquashedLayerIndex(0)
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, totalAreaOfSquashedRects(0) { }
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void updateSquashingStateForNewMapping(CompositedLayerMapping*, bool hasNewCompositedLayerMapping);
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// The most recent composited backing that the layer should squash onto if needed.
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CompositedLayerMapping* mostRecentMapping;
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bool hasMostRecentMapping;
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// Whether all RenderLayers in the stacking subtree rooted at the most recent mapping's
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// owning layer have had CompositedLayerMappings assigned. Layers cannot squash into a
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// CompositedLayerMapping owned by a stacking ancestor, since this changes paint order.
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bool haveAssignedBackingsToEntireSquashingLayerSubtree;
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// Counter that tracks what index the next RenderLayer would be if it gets squashed to the current squashing layer.
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size_t nextSquashedLayerIndex;
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// The absolute bounding rect of all the squashed layers.
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IntRect boundingRect;
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// This is simply the sum of the areas of the squashed rects. This can be very skewed if the rects overlap,
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// but should be close enough to drive a heuristic.
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uint64_t totalAreaOfSquashedRects;
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};
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void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
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CompositingReasons getReasonsPreventingSquashing(const RenderLayer*, const SquashingState&);
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bool squashingWouldExceedSparsityTolerance(const RenderLayer* candidate, const SquashingState&);
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void updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType, Vector<RenderLayer*>& layersNeedingPaintInvalidation);
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bool needsOwnBacking(const RenderLayer*) const;
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RenderLayerCompositor* m_compositor;
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bool m_layerSquashingEnabled;
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bool m_layersChanged;
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};
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} // namespace blink
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#endif // CompositingLayerAssigner_h
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