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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/paint/LayerClipRecorder.h" | 5 #include "core/paint/LayerClipRecorder.h" |
6 | 6 |
7 #include "core/layout/ClipRect.h" | 7 #include "core/layout/ClipRect.h" |
8 #include "core/layout/LayoutView.h" | 8 #include "core/layout/LayoutView.h" |
9 #include "core/paint/PaintLayer.h" | 9 #include "core/paint/PaintLayer.h" |
10 #include "platform/geometry/IntRect.h" | 10 #include "platform/geometry/IntRect.h" |
11 #include "platform/graphics/GraphicsContext.h" | 11 #include "platform/graphics/GraphicsContext.h" |
12 #include "platform/graphics/GraphicsLayer.h" | 12 #include "platform/graphics/GraphicsLayer.h" |
13 #include "platform/graphics/paint/ClipRecorder.h" | 13 #include "platform/graphics/paint/ClipRecorder.h" |
14 #include "platform/graphics/paint/PaintController.h" | 14 #include "platform/graphics/paint/PaintController.h" |
15 | 15 |
16 namespace blink { | 16 namespace blink { |
17 | 17 |
18 LayerClipRecorder::LayerClipRecorder( | 18 LayerClipRecorder::LayerClipRecorder( |
19 GraphicsContext& graphicsContext, | 19 GraphicsContext& graphicsContext, |
20 const LayoutBoxModelObject& layoutObject, | 20 const LayoutBoxModelObject& layoutObject, |
21 DisplayItem::Type clipType, | 21 DisplayItem::Type clipType, |
22 const ClipRect& clipRect, | 22 const ClipRect& clipRect, |
23 const PaintLayerPaintingInfo* localPaintingInfo, | 23 const PaintLayer* clipRoot, |
24 const LayoutPoint& fragmentOffset, | 24 const LayoutPoint& fragmentOffset, |
25 PaintLayerFlags paintFlags, | 25 PaintLayerFlags paintFlags, |
26 BorderRadiusClippingRule rule) | 26 BorderRadiusClippingRule rule) |
27 : m_graphicsContext(graphicsContext), | 27 : m_graphicsContext(graphicsContext), |
28 m_layoutObject(layoutObject), | 28 m_layoutObject(layoutObject), |
29 m_clipType(clipType) { | 29 m_clipType(clipType) { |
30 IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect()); | 30 IntRect snappedClipRect = pixelSnappedIntRect(clipRect.rect()); |
31 Vector<FloatRoundedRect> roundedRects; | 31 Vector<FloatRoundedRect> roundedRects; |
32 if (localPaintingInfo && clipRect.hasRadius()) { | 32 if (clipRoot && clipRect.hasRadius()) { |
33 collectRoundedRectClips(*layoutObject.layer(), *localPaintingInfo, | 33 collectRoundedRectClips(*layoutObject.layer(), clipRoot, |
34 graphicsContext, fragmentOffset, paintFlags, rule, | 34 graphicsContext, fragmentOffset, paintFlags, rule, |
35 roundedRects); | 35 roundedRects); |
36 } | 36 } |
37 | 37 |
38 m_graphicsContext.getPaintController().createAndAppend<ClipDisplayItem>( | 38 m_graphicsContext.getPaintController().createAndAppend<ClipDisplayItem>( |
39 layoutObject, m_clipType, snappedClipRect, roundedRects); | 39 layoutObject, m_clipType, snappedClipRect, roundedRects); |
40 } | 40 } |
41 | 41 |
42 static bool inContainingBlockChain(PaintLayer* startLayer, | 42 static bool inContainingBlockChain(PaintLayer* startLayer, |
43 PaintLayer* endLayer) { | 43 PaintLayer* endLayer) { |
44 if (startLayer == endLayer) | 44 if (startLayer == endLayer) |
45 return true; | 45 return true; |
46 | 46 |
47 LayoutView* view = startLayer->layoutObject()->view(); | 47 LayoutView* view = startLayer->layoutObject()->view(); |
48 for (const LayoutBlock* currentBlock = | 48 for (const LayoutBlock* currentBlock = |
49 startLayer->layoutObject()->containingBlock(); | 49 startLayer->layoutObject()->containingBlock(); |
50 currentBlock && currentBlock != view; | 50 currentBlock && currentBlock != view; |
51 currentBlock = currentBlock->containingBlock()) { | 51 currentBlock = currentBlock->containingBlock()) { |
52 if (currentBlock->layer() == endLayer) | 52 if (currentBlock->layer() == endLayer) |
53 return true; | 53 return true; |
54 } | 54 } |
55 | 55 |
56 return false; | 56 return false; |
57 } | 57 } |
58 | 58 |
59 void LayerClipRecorder::collectRoundedRectClips( | 59 void LayerClipRecorder::collectRoundedRectClips( |
60 PaintLayer& paintLayer, | 60 PaintLayer& paintLayer, |
61 const PaintLayerPaintingInfo& localPaintingInfo, | 61 const PaintLayer* clipRoot, |
62 GraphicsContext& context, | 62 GraphicsContext& context, |
63 const LayoutPoint& fragmentOffset, | 63 const LayoutPoint& fragmentOffset, |
64 PaintLayerFlags paintFlags, | 64 PaintLayerFlags paintFlags, |
65 BorderRadiusClippingRule rule, | 65 BorderRadiusClippingRule rule, |
66 Vector<FloatRoundedRect>& roundedRectClips) { | 66 Vector<FloatRoundedRect>& roundedRectClips) { |
67 // If the clip rect has been tainted by a border radius, then we have to walk | 67 // If the clip rect has been tainted by a border radius, then we have to walk |
68 // up our layer chain applying the clips from any layers with overflow. The | 68 // up our layer chain applying the clips from any layers with overflow. The |
69 // condition for being able to apply these clips is that the overflow object | 69 // condition for being able to apply these clips is that the overflow object |
70 // be in our containing block chain so we check that also. | 70 // be in our containing block chain so we check that also. |
71 for (PaintLayer* layer = rule == IncludeSelfForBorderRadius | 71 for (PaintLayer* layer = rule == IncludeSelfForBorderRadius |
72 ? &paintLayer | 72 ? &paintLayer |
73 : paintLayer.parent(); | 73 : paintLayer.parent(); |
74 layer; layer = layer->parent()) { | 74 layer; layer = layer->parent()) { |
75 // Composited scrolling layers handle border-radius clip in the compositor | 75 // Composited scrolling layers handle border-radius clip in the compositor |
76 // via a mask layer. We do not want to apply a border-radius clip to the | 76 // via a mask layer. We do not want to apply a border-radius clip to the |
77 // layer contents itself, because that would require re-rastering every | 77 // layer contents itself, because that would require re-rastering every |
78 // frame to update the clip. We only want to make sure that the mask layer | 78 // frame to update the clip. We only want to make sure that the mask layer |
79 // is properly clipped so that it can in turn clip the scrolled contents in | 79 // is properly clipped so that it can in turn clip the scrolled contents in |
80 // the compositor. | 80 // the compositor. |
81 if (layer->needsCompositedScrolling() && | 81 if (layer->needsCompositedScrolling() && |
82 !(paintFlags & PaintLayerPaintingChildClippingMaskPhase)) | 82 !(paintFlags & PaintLayerPaintingChildClippingMaskPhase || |
| 83 paintFlags & PaintLayerPaintingAncestorClippingMaskPhase)) |
83 break; | 84 break; |
84 | 85 |
85 if (layer->layoutObject()->hasOverflowClip() && | 86 if (layer->layoutObject()->hasOverflowClip() && |
86 layer->layoutObject()->style()->hasBorderRadius() && | 87 layer->layoutObject()->style()->hasBorderRadius() && |
87 inContainingBlockChain(&paintLayer, layer)) { | 88 inContainingBlockChain(&paintLayer, layer)) { |
88 LayoutPoint delta(fragmentOffset); | 89 LayoutPoint delta(fragmentOffset); |
89 layer->convertToLayerCoords(localPaintingInfo.rootLayer, delta); | 90 layer->convertToLayerCoords(clipRoot, delta); |
90 | 91 |
91 // The PaintLayer's size is pixel-snapped if it is a LayoutBox. We can't | 92 // The PaintLayer's size is pixel-snapped if it is a LayoutBox. We can't |
92 // use a pre-snapped border rect for clipping, since | 93 // use a pre-snapped border rect for clipping, since |
93 // getRoundedInnerBorderFor assumes it has not been snapped yet. | 94 // getRoundedInnerBorderFor assumes it has not been snapped yet. |
94 LayoutSize size(layer->layoutBox() | 95 LayoutSize size(layer->layoutBox() |
95 ? toLayoutBox(layer->layoutObject())->size() | 96 ? toLayoutBox(layer->layoutObject())->size() |
96 : LayoutSize(layer->size())); | 97 : LayoutSize(layer->size())); |
97 roundedRectClips.append( | 98 roundedRectClips.append( |
98 layer->layoutObject()->style()->getRoundedInnerBorderFor( | 99 layer->layoutObject()->style()->getRoundedInnerBorderFor( |
99 LayoutRect(delta, size))); | 100 LayoutRect(delta, size))); |
100 } | 101 } |
101 | 102 |
102 if (layer == localPaintingInfo.rootLayer) | 103 if (layer == clipRoot) |
103 break; | 104 break; |
104 } | 105 } |
105 } | 106 } |
106 | 107 |
107 LayerClipRecorder::~LayerClipRecorder() { | 108 LayerClipRecorder::~LayerClipRecorder() { |
108 m_graphicsContext.getPaintController().endItem<EndClipDisplayItem>( | 109 m_graphicsContext.getPaintController().endItem<EndClipDisplayItem>( |
109 m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType)); | 110 m_layoutObject, DisplayItem::clipTypeToEndClipType(m_clipType)); |
110 } | 111 } |
111 | 112 |
112 } // namespace blink | 113 } // namespace blink |
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