initial preroll api

src/core/SkBitmapProcShader.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkBitmapProcShader_DEFINED
@@ skipping 39 matching lines @@
     private:
         SkBitmapProcState*  fState;
         uint32_t            fFlags;
 
         typedef SkShader::Context INHERITED;
     };
 
 protected:
     void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
+    void onPreroll() const SK_OVERRIDE;
 
     SkBitmap    fRawBitmap;   // experimental for RLE encoding
     uint8_t     fTileModeX, fTileModeY;
 
 private:
     typedef SkShader INHERITED;
 };
 
 // Commonly used allocator. It currently is only used to allocate up to 3 objects. The total
 // bytes requested is calculated using one of our large shaders, its context size plus the size of
 // an Sk3DBlitter in SkDraw.cpp
 // Note that some contexts may contain other contexts (e.g. for compose shaders), but we've not
 // yet found a situation where the size below isn't big enough.
 typedef SkSmallAllocator<3, 1024> SkTBlitterAllocator;
 
 // If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive
 // the SkShader.
 SkShader* SkCreateBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode,
                                const SkMatrix* localMatrix, SkTBlitterAllocator* alloc);
 
 #endif