store SkAlphaType inside SkBitmap, on road to support unpremul

gm/xfermodes3.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 "SkGradientShader.h"
@@ skipping 170 matching lines @@
     }
 
     virtual void onOnceBeforeDraw() SK_OVERRIDE {
         static const uint32_t kCheckData[] = {
             SkPackARGB32(0xFF, 0x40, 0x40, 0x40),
             SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
             SkPackARGB32(0xFF, 0xD0, 0xD0, 0xD0),
             SkPackARGB32(0xFF, 0x40, 0x40, 0x40)
         };
         SkBitmap bg;
-        bg.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
+        bg.setConfig(SkBitmap::kARGB_8888_Config, 2, 2, 0, kOpaque_SkAlphaType);
         bg.allocPixels();
         SkAutoLockPixels bgAlp(bg);
         memcpy(bg.getPixels(), kCheckData, sizeof(kCheckData));
-        bg.setIsOpaque(true);
 
         fBGShader.reset(SkShader::CreateBitmapShader(bg,
                                                      SkShader::kRepeat_TileMode,
                                                      SkShader::kRepeat_TileMode));
         SkMatrix lm;
         lm.setScale(SkIntToScalar(kCheckSize), SkIntToScalar(kCheckSize));
         fBGShader->setLocalMatrix(lm);
 
         SkPaint bmpPaint;
         static const SkPoint kCenter = { SkIntToScalar(kSize) / 2, SkIntToScalar(kSize) / 2 };
@@ skipping 31 matching lines @@
     SkAutoTUnref<SkShader> fBmpShader;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new Xfermodes3GM;)
 
 }