store SkAlphaType inside SkBitmap, on road to support unpremul

gm/xfermodes.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 "gm.h"
 #include "SkBitmap.h"
 #include "SkShader.h"
@@ skipping 42 matching lines @@
                    SkScalar x, SkScalar y) {
         SkPaint p;
 
         canvas->drawBitmap(fSrcB, x, y, &p);
         p.setAlpha(alpha);
         p.setXfermode(mode);
         canvas->drawBitmap(fDstB, x, y, &p);
     }
 
     virtual void onOnceBeforeDraw() SK_OVERRIDE {
-        fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4);
+        fBG.setConfig(SkBitmap::kARGB_4444_Config, 2, 2, 4, kOpaque_SkAlphaType);
         fBG.setPixels(gData);
-        fBG.setIsOpaque(true);
 
         make_bitmaps(W, H, &fSrcB, &fDstB);
     }
 
 public:
     const static int W = 64;
     const static int H = 64;
     XfermodesGM() {}
 
 protected:
@@ skipping 100 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new XfermodesGM; }
 static GMRegistry reg(MyFactory);
 
 }