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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "config.h" | |
6 #include "core/paint/SVGClipPainter.h" | |
7 | |
8 #include "core/dom/ElementTraversal.h" | |
9 #include "core/layout/PaintInfo.h" | |
10 #include "core/layout/svg/LayoutSVGResourceClipper.h" | |
11 #include "core/layout/svg/SVGResources.h" | |
12 #include "core/layout/svg/SVGResourcesCache.h" | |
13 #include "core/paint/CompositingRecorder.h" | |
14 #include "core/paint/TransformRecorder.h" | |
15 #include "platform/graphics/paint/ClipPathDisplayItem.h" | |
16 #include "platform/graphics/paint/CompositingDisplayItem.h" | |
17 #include "platform/graphics/paint/DisplayItemList.h" | |
18 #include "platform/graphics/paint/DrawingDisplayItem.h" | |
19 #include "wtf/TemporaryChange.h" | |
20 | |
21 namespace blink { | |
22 | |
23 bool SVGClipPainter::applyStatefulResource(LayoutObject* object, GraphicsContext *& context, ClipperState& clipperState) | |
24 { | |
25 ASSERT(object); | |
26 ASSERT(context); | |
27 | |
28 m_clip.clearInvalidationMask(); | |
29 | |
30 return applyClippingToContext(object, object->objectBoundingBox(), object->p aintInvalidationRectInLocalCoordinates(), context, clipperState); | |
31 } | |
32 | |
33 class SVGClipExpansionCycleHelper { | |
34 public: | |
35 SVGClipExpansionCycleHelper(LayoutSVGResourceClipper& clip) : m_clip(clip) { clip.beginClipExpansion(); } | |
36 ~SVGClipExpansionCycleHelper() { m_clip.endClipExpansion(); } | |
37 private: | |
38 LayoutSVGResourceClipper& m_clip; | |
39 }; | |
40 | |
41 bool SVGClipPainter::applyClippingToContext(LayoutObject* target, const FloatRec t& targetBoundingBox, | |
42 const FloatRect& paintInvalidationRect, GraphicsContext* context, ClipperSta te& clipperState) | |
43 { | |
44 ASSERT(target); | |
45 ASSERT(context); | |
46 ASSERT(clipperState == ClipperNotApplied); | |
47 ASSERT_WITH_SECURITY_IMPLICATION(!m_clip.needsLayout()); | |
48 | |
49 if (paintInvalidationRect.isEmpty() || m_clip.hasCycle()) | |
50 return false; | |
51 | |
52 SVGClipExpansionCycleHelper inClipExpansionChange(m_clip); | |
53 | |
54 AffineTransform animatedLocalTransform = toSVGClipPathElement(m_clip.element ())->calculateAnimatedLocalTransform(); | |
55 // When drawing a clip for non-SVG elements, the CTM does not include the zo om factor. | |
56 // In this case, we need to apply the zoom scale explicitly - but only for c lips with | |
57 // userSpaceOnUse units (the zoom is accounted for objectBoundingBox-resolve d lengths). | |
58 if (!target->isSVG() && m_clip.clipPathUnits() == SVGUnitTypes::SVG_UNIT_TYP E_USERSPACEONUSE) { | |
59 ASSERT(m_clip.style()); | |
60 animatedLocalTransform.scale(m_clip.style()->effectiveZoom()); | |
61 } | |
62 | |
63 // First, try to apply the clip as a clipPath. | |
64 if (m_clip.tryPathOnlyClipping(target->displayItemClient(), context, animate dLocalTransform, targetBoundingBox)) { | |
65 clipperState = ClipperAppliedPath; | |
66 return true; | |
67 } | |
68 | |
69 // Fall back to masking. | |
70 clipperState = ClipperAppliedMask; | |
71 | |
72 // Begin compositing the clip mask. | |
73 CompositingRecorder::beginCompositing(context, target->displayItemClient(), SkXfermode::kSrcOver_Mode, 1, &paintInvalidationRect); | |
74 { | |
75 TransformRecorder recorder(*context, target->displayItemClient(), animat edLocalTransform); | |
76 | |
77 // clipPath can also be clipped by another clipPath. | |
78 SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObj ect(&m_clip); | |
79 LayoutSVGResourceClipper* clipPathClipper = resources ? resources->clipp er() : 0; | |
80 ClipperState clipPathClipperState = ClipperNotApplied; | |
81 if (clipPathClipper && !SVGClipPainter(*clipPathClipper).applyClippingTo Context(&m_clip, targetBoundingBox, paintInvalidationRect, context, clipPathClip perState)) { | |
82 // End the clip mask's compositor. | |
83 CompositingRecorder::endCompositing(context, target->displayItemClie nt()); | |
84 return false; | |
85 } | |
86 | |
87 drawClipMaskContent(context, target->displayItemClient(), targetBounding Box); | |
88 | |
89 if (clipPathClipper) | |
90 SVGClipPainter(*clipPathClipper).postApplyStatefulResource(&m_clip, context, clipPathClipperState); | |
91 } | |
92 | |
93 // Masked content layer start. | |
94 CompositingRecorder::beginCompositing(context, target->displayItemClient(), SkXfermode::kSrcIn_Mode, 1, &paintInvalidationRect); | |
95 | |
96 return true; | |
97 } | |
98 | |
99 void SVGClipPainter::postApplyStatefulResource(LayoutObject* target, GraphicsCon text*& context, ClipperState& clipperState) | |
100 { | |
101 switch (clipperState) { | |
102 case ClipperAppliedPath: | |
103 // Path-only clipping, no layers to restore but we need to emit an end t o the clip path display item. | |
104 { | |
pdr.
2015/03/05 22:21:16
Are these braces needed?
Erik Dahlström (inactive)
2015/03/06 11:55:49
Doesn't seem like it. Consider them gone.
| |
105 if (RuntimeEnabledFeatures::slimmingPaintEnabled()) { | |
106 context->displayItemList()->add(EndClipPathDisplayItem::create(t arget->displayItemClient())); | |
107 } else { | |
108 EndClipPathDisplayItem endClipPathDisplayItem(target->displayIte mClient()); | |
109 endClipPathDisplayItem.replay(context); | |
110 } | |
111 } | |
112 break; | |
113 case ClipperAppliedMask: | |
114 // Transfer content -> clip mask (SrcIn) | |
115 CompositingRecorder::endCompositing(context, target->displayItemClient() ); | |
116 | |
117 // Transfer clip mask -> bg (SrcOver) | |
118 CompositingRecorder::endCompositing(context, target->displayItemClient() ); | |
119 break; | |
120 default: | |
121 ASSERT_NOT_REACHED(); | |
122 } | |
123 } | |
124 | |
125 void SVGClipPainter::drawClipMaskContent(GraphicsContext* context, DisplayItemCl ient client, const FloatRect& targetBoundingBox) | |
126 { | |
127 ASSERT(context); | |
128 | |
129 AffineTransform contentTransformation; | |
130 RefPtr<const SkPicture> clipContentPicture = m_clip.createContentPicture(con tentTransformation, targetBoundingBox); | |
131 | |
132 TransformRecorder recorder(*context, client, contentTransformation); | |
133 if (RuntimeEnabledFeatures::slimmingPaintEnabled()) { | |
134 ASSERT(context->displayItemList()); | |
135 context->displayItemList()->add(DrawingDisplayItem::create(client, Displ ayItem::SVGClip, clipContentPicture)); | |
136 } else { | |
137 DrawingDisplayItem clipPicture(client, DisplayItem::SVGClip, clipContent Picture); | |
138 clipPicture.replay(context); | |
139 } | |
140 } | |
141 | |
142 } | |
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