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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) 2013 Google Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #ifndef FEMorphology_h
     24 #define FEMorphology_h
     25 
     26 #include "core/platform/graphics/filters/Filter.h"
     27 #include "core/platform/graphics/filters/FilterEffect.h"
     28 
     29 namespace WebCore {
     30 
     31 enum MorphologyOperatorType {
     32     FEMORPHOLOGY_OPERATOR_UNKNOWN = 0,
     33     FEMORPHOLOGY_OPERATOR_ERODE = 1,
     34     FEMORPHOLOGY_OPERATOR_DILATE = 2
     35 };
     36 
     37 class FEMorphology : public FilterEffect {
     38 public:
     39     static PassRefPtr<FEMorphology> create(Filter*, MorphologyOperatorType, float radiusX, float radiusY);
     40     MorphologyOperatorType morphologyOperator() const;
     41     bool setMorphologyOperator(MorphologyOperatorType);
     42 
     43     float radiusX() const;
     44     bool setRadiusX(float);
     45 
     46     float radiusY() const;
     47     bool setRadiusY(float);
     48 
     49     virtual PassRefPtr<SkImageFilter> createImageFilter(SkiaImageFilterBuilder*) OVERRIDE;
     50 
     51     virtual void determineAbsolutePaintRect();
     52     virtual FloatRect mapRect(const FloatRect&, bool forward = true) OVERRIDE FINAL;
     53 
     54     virtual TextStream& externalRepresentation(TextStream&, int indention) const;
     55 
     56     struct PaintingData {
     57         Uint8ClampedArray* srcPixelArray;
     58         Uint8ClampedArray* dstPixelArray;
     59         int width;
     60         int height;
     61         int radiusX;
     62         int radiusY;
     63     };
     64 
     65     static const int s_minimalArea = (300 * 300); // Empirical data limit for parallel jobs
     66 
     67     struct PlatformApplyParameters {
     68         FEMorphology* filter;
     69         int startY;
     70         int endY;
     71         PaintingData* paintingData;
     72     };
     73 
     74     static void platformApplyWorker(PlatformApplyParameters*);
     75 
     76     inline void platformApply(PaintingData*);
     77     inline void platformApplyGeneric(PaintingData*, const int yStart, const int yEnd);
     78 private:
     79     FEMorphology(Filter*, MorphologyOperatorType, float radiusX, float radiusY);
     80 
     81     virtual void applySoftware() OVERRIDE;
     82     virtual bool applySkia() OVERRIDE;
     83 
     84     MorphologyOperatorType m_type;
     85     float m_radiusX;
     86     float m_radiusY;
     87 };
     88 
     89 } // namespace WebCore
     90 
     91 #endif // FEMorphology_h
     92