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

   1 /*
   2  * Copyright 2012 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 SkMergeImageFilter_DEFINED
   9 #define SkMergeImageFilter_DEFINED
  10
  11 #include "SkImageFilter.h"
  12
  13 #include "SkXfermode.h"
  14
  15 class SK_API SkMergeImageFilter : public SkImageFilter {
  16 public:
  17     virtual ~SkMergeImageFilter();
  18
  19     static SkMergeImageFilter* Create(SkImageFilter* first, SkImageFilter* second,
  20                                       SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
  21                                       const CropRect* cropRect = NULL,
  22                                       uint32_t uniqueID = 0) {
  23         SkImageFilter* inputs[2] = { first, second };
  24         SkXfermode::Mode modes[2] = { mode, mode };
  25         return SkNEW_ARGS(SkMergeImageFilter, (inputs, 2, modes, cropRect, uniqueID));
  26     }
  27     static SkMergeImageFilter* Create(SkImageFilter* filters[], int count,
  28                                       const SkXfermode::Mode modes[] = NULL,
  29                                       const CropRect* cropRect = NULL,
  30                                       uint32_t uniqueID = 0) {
  31         return SkNEW_ARGS(SkMergeImageFilter, (filters, count, modes, cropRect, uniqueID));
  32     }
  33
  34     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMergeImageFilter)
  35
  36 protected:
  37     SkMergeImageFilter(SkImageFilter* filters[], int count,
  38                        const SkXfermode::Mode modes[],
  39                        const CropRect* cropRect,
  40                        uint32_t uniqueID);
  41 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
  42     explicit SkMergeImageFilter(SkReadBuffer& buffer);
  43 #endif
  44     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
  45
  46     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
  47                                SkBitmap* result, SkIPoint* loc) const SK_OVERRIDE;
  48
  49 private:
  50     uint8_t*            fModes; // SkXfermode::Mode
  51
  52     // private storage, to avoid dynamically allocating storage for our copy
  53     // of the modes (unless the count is so large we can't fit).
  54     intptr_t    fStorage[16];
  55
  56     void initAllocModes();
  57     void initModes(const SkXfermode::Mode []);
  58
  59     typedef SkImageFilter INHERITED;
  60 };
  61
  62 #endif