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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2005 Eric Seidel <eric (at) webkit.org>
      5  * Copyright (C) 2010 Zoltan Herczeg <zherczeg (at) webkit.org>
      6  * Copyright (C) 2013 Google Inc. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #ifndef FEConvolveMatrix_h
     25 #define FEConvolveMatrix_h
     26 
     27 #include "core/platform/graphics/FloatPoint.h"
     28 #include "core/platform/graphics/FloatSize.h"
     29 #include "core/platform/graphics/filters/Filter.h"
     30 #include "core/platform/graphics/filters/FilterEffect.h"
     31 #include "wtf/Vector.h"
     32 
     33 namespace WebCore {
     34 
     35 enum EdgeModeType {
     36     EDGEMODE_UNKNOWN   = 0,
     37     EDGEMODE_DUPLICATE = 1,
     38     EDGEMODE_WRAP      = 2,
     39     EDGEMODE_NONE      = 3
     40 };
     41 
     42 class FEConvolveMatrix : public FilterEffect {
     43 public:
     44     static PassRefPtr<FEConvolveMatrix> create(Filter*, const IntSize&,
     45             float, float, const IntPoint&, EdgeModeType, const FloatPoint&,
     46             bool, const Vector<float>&);
     47 
     48     IntSize kernelSize() const;
     49     void setKernelSize(const IntSize&);
     50 
     51     const Vector<float>& kernel() const;
     52     void setKernel(const Vector<float>&);
     53 
     54     float divisor() const;
     55     bool setDivisor(float);
     56 
     57     float bias() const;
     58     bool setBias(float);
     59 
     60     IntPoint targetOffset() const;
     61     bool setTargetOffset(const IntPoint&);
     62 
     63     EdgeModeType edgeMode() const;
     64     bool setEdgeMode(EdgeModeType);
     65 
     66     FloatPoint kernelUnitLength() const;
     67     bool setKernelUnitLength(const FloatPoint&);
     68 
     69     bool preserveAlpha() const;
     70     bool setPreserveAlpha(bool);
     71 
     72     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
     73 
     74     virtual void determineAbsolutePaintRect() { setAbsolutePaintRect(enclosingIntRect(maxEffectRect())); }
     75 
     76     virtual TextStream& externalRepresentation(TextStream&, int indention) const;
     77 
     78 private:
     79 
     80     struct PaintingData {
     81         Uint8ClampedArray* srcPixelArray;
     82         Uint8ClampedArray* dstPixelArray;
     83         int width;
     84         int height;
     85         float bias;
     86     };
     87 
     88     FEConvolveMatrix(Filter*, const IntSize&, float, float,
     89             const IntPoint&, EdgeModeType, const FloatPoint&, bool, const Vector<float>&);
     90 
     91     virtual void applySoftware() OVERRIDE;
     92 
     93     template<bool preserveAlphaValues>
     94     ALWAYS_INLINE void fastSetInteriorPixels(PaintingData&, int clipRight, int clipBottom, int yStart, int yEnd);
     95 
     96     ALWAYS_INLINE int getPixelValue(PaintingData&, int x, int y);
     97 
     98     template<bool preserveAlphaValues>
     99     void fastSetOuterPixels(PaintingData&, int x1, int y1, int x2, int y2);
    100 
    101     // Wrapper functions
    102     ALWAYS_INLINE void setInteriorPixels(PaintingData&, int clipRight, int clipBottom, int yStart, int yEnd);
    103     ALWAYS_INLINE void setOuterPixels(PaintingData&, int x1, int y1, int x2, int y2);
    104 
    105     // Parallelization parts
    106     static const int s_minimalRectDimension = (100 * 100); // Empirical data limit for parallel jobs
    107 
    108     template<typename Type>
    109     friend class ParallelJobs;
    110 
    111     struct InteriorPixelParameters {
    112         FEConvolveMatrix* filter;
    113         PaintingData* paintingData;
    114         int clipBottom;
    115         int clipRight;
    116         int yStart;
    117         int yEnd;
    118     };
    119 
    120     static void setInteriorPixelsWorker(InteriorPixelParameters*);
    121 
    122     IntSize m_kernelSize;
    123     float m_divisor;
    124     float m_bias;
    125     IntPoint m_targetOffset;
    126     EdgeModeType m_edgeMode;
    127     FloatPoint m_kernelUnitLength;
    128     bool m_preserveAlpha;
    129     Vector<float> m_kernelMatrix;
    130 };
    131 
    132 } // namespace WebCore
    133 
    134 #endif // FEConvolveMatrix_h
    135