replace setConfig+allocPixels with single call

tests/ShaderImageFilterTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
 #include "SkRectShaderImageFilter.h"
 #include "SkShader.h"
 #include "Test.h"
 
 DEF_TEST(ShaderImageFilter, reporter) {
     int w = 10, h = 10;
     SkRect r = SkRect::MakeWH(SkIntToScalar(w), SkIntToScalar(h)); // Make small 10x10 gradient
 
     SkBitmap filterResult, shaderResult;
 
-    filterResult.setConfig(SkBitmap::kARGB_8888_Config, w, h);
-    filterResult.allocPixels();
+    filterResult.allocN32Pixels(w, h);
     SkCanvas canvasFilter(filterResult);
     canvasFilter.clear(0x00000000);
 
-    shaderResult.setConfig(SkBitmap::kARGB_8888_Config, w, h);
-    shaderResult.allocPixels();
+    shaderResult.allocN32Pixels(w, h);
     SkCanvas canvasShader(shaderResult);
     canvasShader.clear(0x00000000);
 
     SkPoint center = SkPoint::Make(SkIntToScalar(5), SkIntToScalar(5));
     SkColor colors[] = {SK_ColorBLUE, SK_ColorRED, SK_ColorGREEN};
     SkScalar pos[] = {0, SK_ScalarHalf, SK_Scalar1};
     SkScalar radius = SkIntToScalar(5);
 
     // Test using the image filter
     {
@@ skipping 17 matching lines @@
 
     // Assert that both paths yielded the same result
     for (int y = 0; y < r.height(); ++y) {
         const SkPMColor* filterPtr = filterResult.getAddr32(0, y);
         const SkPMColor* shaderPtr = shaderResult.getAddr32(0, y);
         for (int x = 0; x < r.width(); ++x, ++filterPtr, ++shaderPtr) {
             REPORTER_ASSERT(reporter, *filterPtr == *shaderPtr);
         }
     }
 }