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 WebCore { 43 44 class GraphicsContext; 45 class RenderLayer; 46 class RenderObject; 47 48 class FilterEffectRendererHelper { 49 public: 50 FilterEffectRendererHelper(bool haveFilterEffect) 51 : m_savedGraphicsContext(0) 52 , m_renderLayer(0) 53 , m_haveFilterEffect(haveFilterEffect) 54 { 55 } 56 57 bool haveFilterEffect() const { return m_haveFilterEffect; } 58 bool hasStartedFilterEffect() const { return m_savedGraphicsContext; } 59 60 bool prepareFilterEffect(RenderLayer*, const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect, const LayoutRect& layerRepaintRect); 61 GraphicsContext* beginFilterEffect(GraphicsContext* oldContext); 62 GraphicsContext* applyFilterEffect(); 63 64 const LayoutRect& repaintRect() const { return m_repaintRect; } 65 private: 66 GraphicsContext* m_savedGraphicsContext; 67 RenderLayer* m_renderLayer; 68 69 LayoutRect m_repaintRect; 70 bool m_haveFilterEffect; 71 }; 72 73 class FilterEffectRenderer FINAL : public Filter 74 { 75 WTF_MAKE_FAST_ALLOCATED; 76 public: 77 static PassRefPtr<FilterEffectRenderer> create() 78 { 79 return adoptRef(new FilterEffectRenderer()); 80 } 81 82 void setSourceImageRect(const IntRect& sourceImageRect) 83 { 84 m_sourceDrawingRegion = sourceImageRect; 85 m_graphicsBufferAttached = false; 86 } 87 virtual IntRect sourceImageRect() const OVERRIDE { return m_sourceDrawingRegion; } 88 89 GraphicsContext* inputContext(); 90 ImageBuffer* output() const { return lastEffect()->asImageBuffer(); } 91 92 bool build(RenderObject* renderer, const FilterOperations&); 93 bool updateBackingStoreRect(const FloatRect& filterRect); 94 void allocateBackingStoreIfNeeded(); 95 void clearIntermediateResults(); 96 void apply(); 97 98 IntRect outputRect() const { return lastEffect()->hasResult() ? lastEffect()->absolutePaintRect() : IntRect(); } 99 100 bool hasFilterThatMovesPixels() const { return m_hasFilterThatMovesPixels; } 101 LayoutRect computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect); 102 103 PassRefPtr<FilterEffect> lastEffect() const 104 { 105 return m_lastEffect; 106 } 107 private: 108 109 FilterEffectRenderer(); 110 virtual ~FilterEffectRenderer(); 111 112 IntRect m_sourceDrawingRegion; 113 114 RefPtr<SourceGraphic> m_sourceGraphic; 115 RefPtr<FilterEffect> m_lastEffect; 116 117 IntRectExtent m_outsets; 118 119 bool m_graphicsBufferAttached; 120 bool m_hasFilterThatMovesPixels; 121 }; 122 123 } // namespace WebCore 124 125 126 #endif // FilterEffectRenderer_h 127