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

src/core/SkBlitter_Sprite.cpp

-
 /*
  * 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.
  */
 
-
 #include "SkSpriteBlitter.h"
+#include "SkStackAllocator.h"
 
 SkSpriteBlitter::SkSpriteBlitter(const SkBitmap& source)
         : fSource(&source) {
     fSource->lockPixels();
 }
 
 SkSpriteBlitter::~SkSpriteBlitter() {
     fSource->unlockPixels();
 }
 
@@ skipping 21 matching lines @@
 
 void SkSpriteBlitter::blitMask(const SkMask&, const SkIRect& clip) {
     SkDEBUGFAIL("how did we get here?");
 }
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 // returning null means the caller will call SkBlitter::Choose() and
 // have wrapped the source bitmap inside a shader
-SkBlitter* SkBlitter::ChooseSprite( const SkBitmap& device,
-                                    const SkPaint& paint,
-                                    const SkBitmap& source,
-                                    int left, int top,
-                                    void* storage, size_t storageSize) {
+SkBlitter* SkBlitter::ChooseSprite(const SkBitmap& device, const SkPaint& paint,
+        const SkBitmap& source, int left, int top,
+        SkStackAllocator<kBlitterStorageByteCount>* allocator) {
     /*  We currently ignore antialiasing and filtertype, meaning we will take our
         special blitters regardless of these settings. Ignoring filtertype seems fine
         since by definition there is no scale in the matrix. Ignoring antialiasing is
         a bit of a hack, since we "could" pass in the fractional left/top for the bitmap,
         and respect that by blending the edges of the bitmap against the device. To support
         this we could either add more special blitters here, or detect antialiasing in the
         paint and return null if it is set, forcing the client to take the slow shader case
         (which does respect soft edges).
     */
+    SkASSERT(allocator != NULL);
 
     SkSpriteBlitter* blitter;
 
     switch (device.colorType()) {
         case kRGB_565_SkColorType:
-            blitter = SkSpriteBlitter::ChooseD16(source, paint, storage,
-                                                 storageSize);
+            blitter = SkSpriteBlitter::ChooseD16(source, paint, allocator);
             break;
         case kPMColor_SkColorType:
-            blitter = SkSpriteBlitter::ChooseD32(source, paint, storage,
-                                                 storageSize);
+            blitter = SkSpriteBlitter::ChooseD32(source, paint, allocator);
             break;
         default:
             blitter = NULL;
             break;
     }
 
     if (blitter) {
         blitter->setup(device, left, top, paint);
     }
     return blitter;
 }