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1 /*
2  * Copyright (C) 2011 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef FilterEffectRenderer_h
27 #define FilterEffectRenderer_h
28 
29 #include "core/svg/graphics/filters/SVGFilterBuilder.h"
30 #include "platform/geometry/FloatRect.h"
31 #include "platform/geometry/IntRectExtent.h"
32 #include "platform/geometry/LayoutRect.h"
33 #include "platform/graphics/ImageBuffer.h"
34 #include "platform/graphics/filters/Filter.h"
35 #include "platform/graphics/filters/FilterEffect.h"
36 #include "platform/graphics/filters/FilterOperations.h"
37 #include "platform/graphics/filters/SourceGraphic.h"
38 #include "wtf/PassRefPtr.h"
39 #include "wtf/RefCounted.h"
40 #include "wtf/RefPtr.h"
41 
42 namespace blink {
43 
44 class GraphicsContext;
45 class RenderLayer;
46 class RenderObject;
47 
48 class FilterEffectRendererHelper {
49 public:
FilterEffectRendererHelper(bool haveFilterEffect)50     FilterEffectRendererHelper(bool haveFilterEffect)
51         : m_savedGraphicsContext(0)
52         , m_renderLayer(0)
53         , m_haveFilterEffect(haveFilterEffect)
54     {
55     }
56 
haveFilterEffect()57     bool haveFilterEffect() const { return m_haveFilterEffect; }
hasStartedFilterEffect()58     bool hasStartedFilterEffect() const { return m_savedGraphicsContext; }
59 
60     bool prepareFilterEffect(RenderLayer*, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect);
61     GraphicsContext* beginFilterEffect(GraphicsContext* oldContext);
62     GraphicsContext* applyFilterEffect();
63 
paintInvalidationRect()64     const LayoutRect& paintInvalidationRect() const { return m_paintInvalidationRect; }
65 private:
66     GraphicsContext* m_savedGraphicsContext;
67     RenderLayer* m_renderLayer;
68 
69     LayoutRect m_paintInvalidationRect;
70     FloatRect m_filterBoxRect;
71     bool m_haveFilterEffect;
72 };
73 
74 class FilterEffectRenderer FINAL : public Filter
75 {
76     WTF_MAKE_FAST_ALLOCATED;
77 public:
create()78     static PassRefPtr<FilterEffectRenderer> create()
79     {
80         return adoptRef(new FilterEffectRenderer());
81     }
82 
setSourceImageRect(const IntRect & sourceImageRect)83     void setSourceImageRect(const IntRect& sourceImageRect)
84     {
85         m_sourceDrawingRegion = sourceImageRect;
86         m_graphicsBufferAttached = false;
87     }
sourceImageRect()88     virtual IntRect sourceImageRect() const OVERRIDE { return m_sourceDrawingRegion; }
89 
90     GraphicsContext* inputContext();
output()91     ImageBuffer* output() const { return lastEffect()->asImageBuffer(); }
92 
93     bool build(RenderObject* renderer, const FilterOperations&);
94     bool updateBackingStoreRect(const FloatRect& filterRect);
95     void allocateBackingStoreIfNeeded();
96     void clearIntermediateResults();
97     void apply();
98 
outputRect()99     IntRect outputRect() const { return lastEffect()->hasResult() ? lastEffect()->absolutePaintRect() : IntRect(); }
100 
hasFilterThatMovesPixels()101     bool hasFilterThatMovesPixels() const { return m_hasFilterThatMovesPixels; }
102     LayoutRect computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect);
103 
lastEffect()104     PassRefPtr<FilterEffect> lastEffect() const
105     {
106         return m_lastEffect;
107     }
108 private:
109 
110     FilterEffectRenderer();
111     virtual ~FilterEffectRenderer();
112 
113     IntRect m_sourceDrawingRegion;
114 
115     RefPtr<SourceGraphic> m_sourceGraphic;
116     RefPtr<FilterEffect> m_lastEffect;
117 
118     bool m_graphicsBufferAttached;
119     bool m_hasFilterThatMovesPixels;
120 };
121 
122 } // namespace blink
123 
124 
125 #endif // FilterEffectRenderer_h
126