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      1 
      2 /*
      3  * Copyright 2006 The Android Open Source Project
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #ifndef SkBitmapProcShader_DEFINED
     11 #define SkBitmapProcShader_DEFINED
     12 
     13 #include "SkShader.h"
     14 #include "SkBitmapProcState.h"
     15 #include "SkSmallAllocator.h"
     16 
     17 class SkBitmapProcShader : public SkShader {
     18 public:
     19     SkBitmapProcShader(const SkBitmap& src, TileMode tx, TileMode ty,
     20                        const SkMatrix* localMatrix = NULL);
     21 
     22     // overrides from SkShader
     23     virtual bool isOpaque() const SK_OVERRIDE;
     24     virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, TileMode*) const SK_OVERRIDE;
     25 
     26     virtual size_t contextSize() const SK_OVERRIDE;
     27 
     28     static bool CanDo(const SkBitmap&, TileMode tx, TileMode ty);
     29 
     30     SK_TO_STRING_OVERRIDE()
     31     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBitmapProcShader)
     32 
     33 
     34     bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix*, GrColor*,
     35                              GrFragmentProcessor**)
     36             const SK_OVERRIDE;
     37 
     38     class BitmapProcShaderContext : public SkShader::Context {
     39     public:
     40         // The context takes ownership of the state. It will call its destructor
     41         // but will NOT free the memory.
     42         BitmapProcShaderContext(const SkBitmapProcShader&, const ContextRec&, SkBitmapProcState*);
     43         virtual ~BitmapProcShaderContext();
     44 
     45         virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
     46         virtual ShadeProc asAShadeProc(void** ctx) SK_OVERRIDE;
     47         virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE;
     48 
     49         virtual uint32_t getFlags() const SK_OVERRIDE { return fFlags; }
     50 
     51     private:
     52         SkBitmapProcState*  fState;
     53         uint32_t            fFlags;
     54 
     55         typedef SkShader::Context INHERITED;
     56     };
     57 
     58 protected:
     59 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     60     SkBitmapProcShader(SkReadBuffer& );
     61 #endif
     62     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     63     virtual Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
     64 
     65     SkBitmap    fRawBitmap;   // experimental for RLE encoding
     66     uint8_t     fTileModeX, fTileModeY;
     67 
     68 private:
     69     typedef SkShader INHERITED;
     70 };
     71 
     72 // Commonly used allocator. It currently is only used to allocate up to 3 objects. The total
     73 // bytes requested is calculated using one of our large shaders, its context size plus the size of
     74 // an Sk3DBlitter in SkDraw.cpp
     75 // Note that some contexts may contain other contexts (e.g. for compose shaders), but we've not
     76 // yet found a situation where the size below isn't big enough.
     77 typedef SkSmallAllocator<3, 1024> SkTBlitterAllocator;
     78 
     79 // If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive
     80 // the SkShader.
     81 SkShader* CreateBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode,
     82                              const SkMatrix* localMatrix, SkTBlitterAllocator* alloc);
     83 
     84 #endif
     85