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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 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