Fix a warning in bitmap checksummer.

src/utils/SkBitmapChecksummer.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkBitmapChecksummer.h"
 #include "SkBitmapTransformer.h"
 #include "SkCityHash.h"
 #include "SkEndian.h"
 
 /**
  * Write an integer value into a bytebuffer in little-endian order.
  */
 static void write_int_to_buffer(int val, char* buf) {
     val = SkEndian_SwapLE32(val);
     for (int byte=0; byte<4; byte++) {
         *buf++ = (char)(val & 0xff);
         val = val >> 8;
     }
 }
 
 /*static*/ uint64_t SkBitmapChecksummer::Compute64Internal(
         const SkBitmap& bitmap, const SkBitmapTransformer& transformer) {
-    int pixelBufferSize = transformer.bytesNeededTotal();
-    int totalBufferSize = pixelBufferSize + 8; // leave room for x/y dimensions
+    size_t pixelBufferSize = transformer.bytesNeededTotal();
+    size_t totalBufferSize = pixelBufferSize + 8; // leave room for x/y dimensions
 
     SkAutoMalloc bufferManager(totalBufferSize);
     char *bufferStart = static_cast<char *>(bufferManager.get());
     char *bufPtr = bufferStart;
     // start with the x/y dimensions
     write_int_to_buffer(bitmap.width(), bufPtr);
     bufPtr += 4;
     write_int_to_buffer(bitmap.height(), bufPtr);
     bufPtr += 4;
 
@@ skipping 20 matching lines @@
     SkBitmap copyBitmap;
     bitmap.copyTo(&copyBitmap, SkBitmap::kARGB_8888_Config);
     const SkBitmapTransformer copyTransformer =
         SkBitmapTransformer(copyBitmap, kPixelFormat);
     if (copyTransformer.isValid(true)) {
         return Compute64Internal(copyBitmap, copyTransformer);
     } else {
         return 0;
     }
 }