replace setConfig+allocPixels with single call

tests/ResourceCacheTest.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #if SK_SUPPORT_GPU
 
 #include "GrContextFactory.h"
 #include "GrResourceCache.h"
 #include "SkGpuDevice.h"
 #include "Test.h"
 
 static const int gWidth = 640;
 static const int gHeight = 480;
 
 ////////////////////////////////////////////////////////////////////////////////
 static void test_cache(skiatest::Reporter* reporter,
                        GrContext* context,
                        SkCanvas* canvas) {
     const SkIRect size = SkIRect::MakeWH(gWidth, gHeight);
 
     SkBitmap src;
-    src.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
-    src.allocPixels();
+    src.allocN32Pixels(size.width(), size.height());
     src.eraseColor(SK_ColorBLACK);
     size_t srcSize = src.getSize();
 
     size_t initialCacheSize = context->getGpuTextureCacheBytes();
 
     int oldMaxNum;
     size_t oldMaxBytes;
     context->getTextureCacheLimits(&oldMaxNum, &oldMaxBytes);
 
     // Set the cache limits so we can fit 10 "src" images and the
     // max number of textures doesn't matter
     size_t maxCacheSize = initialCacheSize + 10*srcSize;
     context->setTextureCacheLimits(1000, maxCacheSize);
 
     SkBitmap readback;
-    readback.setConfig(SkBitmap::kARGB_8888_Config, size.width(), size.height());
-    readback.allocPixels();
+    readback.allocN32Pixels(size.width(), size.height());
 
     for (int i = 0; i < 100; ++i) {
         canvas->drawBitmap(src, 0, 0);
         canvas->readPixels(size, &readback);
 
         // "modify" the src texture
         src.notifyPixelsChanged();
 
         size_t curCacheSize = context->getGpuTextureCacheBytes();
 
@@ skipping 144 matching lines @@
         SkAutoTUnref<SkGpuDevice> device(SkNEW_ARGS(SkGpuDevice, (context, texture.get())));
         SkCanvas canvas(device.get());
 
         test_cache(reporter, context, &canvas);
         test_purge_invalidated(reporter, context);
         test_cache_delete_on_destruction(reporter, context);
     }
 }
 
 #endif