src/third_party/skia/include/effects/SkXfermodeImageFilter.h

   1 /*
   2  * Copyright 2013 The Android Open Source Project
   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 SkXfermodeImageFilter_DEFINED
   9 #define SkXfermodeImageFilter_DEFINED
  10
  11 #include "SkImageFilter.h"
  12
  13 class SkBitmap;
  14 class SkXfermode;
  15
  16 class SK_API SkXfermodeImageFilter : public SkImageFilter {
  17     /**
  18      * This filter takes an xfermode, and uses it to composite the foreground
  19      * over the background.  If foreground or background is NULL, the input
  20      * bitmap (src) is used instead.
  21       */
  22
  23 public:
  24     virtual ~SkXfermodeImageFilter();
  25
  26     static SkXfermodeImageFilter* Create(SkXfermode* mode, SkImageFilter* background,
  27                                          SkImageFilter* foreground = NULL,
  28                                          const CropRect* cropRect = NULL,
  29                                          uint32_t uniqueID = 0) {
  30         SkImageFilter* inputs[2] = { background, foreground };
  31         return SkNEW_ARGS(SkXfermodeImageFilter, (mode, inputs, cropRect, uniqueID));
  32     }
  33
  34     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkXfermodeImageFilter)
  35
  36     virtual bool onFilterImage(Proxy* proxy,
  37                                const SkBitmap& src,
  38                                const Context& ctx,
  39                                SkBitmap* dst,
  40                                SkIPoint* offset) const SK_OVERRIDE;
  41 #if SK_SUPPORT_GPU
  42     virtual bool canFilterImageGPU() const SK_OVERRIDE;
  43     virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const Context& ctx,
  44                                 SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
  45 #endif
  46
  47 protected:
  48     SkXfermodeImageFilter(SkXfermode* mode, SkImageFilter* inputs[2],
  49                           const CropRect* cropRect, uint32_t uniqueID);
  50 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
  51     explicit SkXfermodeImageFilter(SkReadBuffer& buffer);
  52 #endif
  53     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
  54
  55 private:
  56     SkXfermode* fMode;
  57     typedef SkImageFilter INHERITED;
  58 };
  59
  60 #endif