1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* 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.
*/
#ifndef CompositingLayerAssigner_h
#define CompositingLayerAssigner_h
#include "core/rendering/compositing/RenderLayerCompositor.h"
#include "platform/geometry/IntRect.h"
#include "platform/geometry/LayoutPoint.h"
namespace WebCore {
class RenderLayer;
class CompositingLayerAssigner {
public:
explicit CompositingLayerAssigner(RenderLayerCompositor*);
~CompositingLayerAssigner();
void assign(RenderLayer* updateRoot, bool& layersChanged, Vector<RenderLayer*>& layersNeedingRepaint);
// FIXME: This function should be private. We should remove the one caller
// once we've fixed the compositing chicken/egg issues.
CompositingStateTransitionType computeCompositedLayerUpdate(RenderLayer*);
private:
struct SquashingState {
SquashingState()
: mostRecentMapping(0)
, hasMostRecentMapping(false)
, haveAssignedBackingsToEntireSquashingLayerSubtree(false)
, nextSquashedLayerIndex(0)
, totalAreaOfSquashedRects(0) { }
void updateSquashingStateForNewMapping(CompositedLayerMappingPtr, bool hasNewCompositedLayerMapping);
// The most recent composited backing that the layer should squash onto if needed.
CompositedLayerMappingPtr mostRecentMapping;
bool hasMostRecentMapping;
// Whether all RenderLayers in the stacking subtree rooted at the most recent mapping's
// owning layer have had CompositedLayerMappings assigned. Layers cannot squash into a
// CompositedLayerMapping owned by a stacking ancestor, since this changes paint order.
bool haveAssignedBackingsToEntireSquashingLayerSubtree;
// Counter that tracks what index the next RenderLayer would be if it gets squashed to the current squashing layer.
size_t nextSquashedLayerIndex;
// The absolute bounding rect of all the squashed layers.
IntRect boundingRect;
// This is simply the sum of the areas of the squashed rects. This can be very skewed if the rects overlap,
// but should be close enough to drive a heuristic.
uint64_t totalAreaOfSquashedRects;
};
void assignLayersToBackingsInternal(RenderLayer*, SquashingState&, bool& layersChanged, Vector<RenderLayer*>& layersNeedingRepaint);
void assignLayersToBackingsForReflectionLayer(RenderLayer* reflectionLayer, bool& layersChanged, Vector<RenderLayer*>& layersNeedingRepaint);
CompositingReasons getReasonsPreventingSquashing(const RenderLayer*, const SquashingState&);
bool squashingWouldExceedSparsityTolerance(const RenderLayer* candidate, const SquashingState&);
bool updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType, Vector<RenderLayer*>& layersNeedingRepaint);
bool needsOwnBacking(const RenderLayer*) const;
RenderLayerCompositor* m_compositor;
bool m_layerSquashingEnabled;
};
} // namespace WebCore
#endif // CompositingLayerAssigner_h
|
