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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkDisplacementMapEffect_DEFINED
      9 #define SkDisplacementMapEffect_DEFINED
     10 
     11 #include "SkImageFilter.h"
     12 #include "SkBitmap.h"
     13 
     14 class SK_API SkDisplacementMapEffect : public SkImageFilter {
     15 public:
     16     enum ChannelSelectorType {
     17         kUnknown_ChannelSelectorType,
     18         kR_ChannelSelectorType,
     19         kG_ChannelSelectorType,
     20         kB_ChannelSelectorType,
     21         kA_ChannelSelectorType
     22     };
     23 
     24     ~SkDisplacementMapEffect();
     25 
     26     static SkDisplacementMapEffect* Create(ChannelSelectorType xChannelSelector,
     27                                            ChannelSelectorType yChannelSelector,
     28                                            SkScalar scale, SkImageFilter* displacement,
     29                                            SkImageFilter* color = NULL,
     30                                            const CropRect* cropRect = NULL);
     31 
     32     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDisplacementMapEffect)
     33 
     34     virtual bool onFilterImage(Proxy* proxy,
     35                                const SkBitmap& src,
     36                                const Context& ctx,
     37                                SkBitmap* dst,
     38                                SkIPoint* offset) const override;
     39     void computeFastBounds(const SkRect& src, SkRect* dst) const override;
     40 
     41     virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&,
     42                                 SkIRect* dst) const override;
     43 
     44 #if SK_SUPPORT_GPU
     45     bool canFilterImageGPU() const override { return true; }
     46     virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
     47                                 SkBitmap* result, SkIPoint* offset) const override;
     48 #endif
     49 
     50     SK_TO_STRING_OVERRIDE()
     51 
     52 protected:
     53     SkDisplacementMapEffect(ChannelSelectorType xChannelSelector,
     54                             ChannelSelectorType yChannelSelector,
     55                             SkScalar scale, SkImageFilter* inputs[2],
     56                             const CropRect* cropRect);
     57     void flatten(SkWriteBuffer&) const override;
     58 
     59 private:
     60     ChannelSelectorType fXChannelSelector;
     61     ChannelSelectorType fYChannelSelector;
     62     SkScalar fScale;
     63     typedef SkImageFilter INHERITED;
     64     const SkImageFilter* getDisplacementInput() const { return getInput(0); }
     65     const SkImageFilter* getColorInput() const { return getInput(1); }
     66 };
     67 
     68 #endif
     69