Add a class to allocate small objects w/o extra calls to new.

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
 #define SkBitmapProcShader_DEFINED
 
 #include "SkShader.h"
 #include "SkBitmapProcState.h"
+#include "SkSmallAllocator.h"
 
 class SkBitmapProcShader : public SkShader {
 public:
     SkBitmapProcShader(const SkBitmap& src, TileMode tx, TileMode ty);
 
     // overrides from SkShader
     virtual bool isOpaque() const SK_OVERRIDE;
     virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&) SK_OVERRIDE;
     virtual void endContext() SK_OVERRIDE;
     virtual uint32_t getFlags() SK_OVERRIDE { return fFlags; }
@@ skipping 16 matching lines @@
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
     SkBitmap          fRawBitmap;   // experimental for RLE encoding
     SkBitmapProcState fState;
     uint32_t          fFlags;
 
 private:
     typedef SkShader INHERITED;
 };
 
+// Commonly used allocator. It currently is only used to allocate up to 2 objects. The total
+// bytes requested is calculated using one of our large shaders plus the size of an Sk3DBlitter
+// in SkDraw.cpp
+typedef SkSmallAllocator<2, sizeof(SkBitmapProcShader) + sizeof(void*) * 2> SkTBlitterAllocator;
+
+// If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive
+// the SkShader.
+SkShader* CreateBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode,
+                             SkTBlitterAllocator* alloc);
+
 #endif