add legacy/helper allocN32Pixels, and convert gm to use it

gm/clippedbitmapshaders.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.
  */
 
 #include "gm.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkColor.h"
 #include "SkShader.h"
 
 namespace skiagm {
 
 // This GM draws a 3x3 grid (with the center element excluded) of rectangles
 // filled with a bitmap shader. The bitmap shader is transformed so that the
 // pattern cell is at the center (excluded) region.
 //
 // In Repeat and Mirror mode, this tests that the bitmap shader still draws
 // even though the pattern cell is outside the clip.
 //
 // In Clamp mode, this tests that the clamp is handled properly. For PDF,
 // (and possibly other exported formats) this also "tests" that the image itself
 // is not stored (well, you'll need to open it up with an external tool to
 // verify that).
 
 static SkBitmap create_bitmap() {
     SkBitmap bmp;
-    bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
-    bmp.allocPixels();
-    bmp.lockPixels();
+    bmp.allocN32Pixels(2, 2);
     uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
     pixels[0] = SkPreMultiplyColor(SK_ColorRED);
     pixels[1] = SkPreMultiplyColor(SK_ColorGREEN);
     pixels[2] = SkPreMultiplyColor(SK_ColorBLACK);
     pixels[3] = SkPreMultiplyColor(SK_ColorBLUE);
-    bmp.unlockPixels();
 
     return bmp;
 }
 
 static const SkScalar RECT_SIZE = 64;
 static const SkScalar SLIDE_SIZE = 300;
 
 class ClippedBitmapShadersGM : public GM {
 public:
     ClippedBitmapShadersGM(SkShader::TileMode mode, bool hq=false)
@@ skipping 74 matching lines @@
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode); )
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode); )
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode); )
 
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode, true); )
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode, true); )
 DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode, true); )
 
 
 }