store SkAlphaType inside SkBitmap, on road to support unpremul

gm/xfermodes2.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 "SkShader.h"
@@ skipping 75 matching lines @@
 
 private:
     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);
 
         fBG.reset(SkShader::CreateBitmapShader(bg,
                                                SkShader::kRepeat_TileMode,
                                                SkShader::kRepeat_TileMode));
         SkMatrix lm;
         lm.setScale(SkIntToScalar(16), SkIntToScalar(16));
         fBG->setLocalMatrix(lm);
 
         SkBitmap dstBmp;
         dstBmp.setConfig(SkBitmap::kARGB_8888_Config, kSize, kSize);
@@ skipping 40 matching lines @@
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new Xfermodes2GM; }
 static GMRegistry reg(MyFactory);
 
 }