store SkAlphaType inside SkBitmap, on road to support unpremul

gm/bleed.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 "SkBlurMask.h"
 #include "SkBlurMaskFilter.h"
 #include "SkCanvas.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #endif
 
 // Create a black&white checked texture with a 1-pixel red ring
 // around the outside edge
 static void make_red_ringed_bitmap(SkBitmap* result, int width, int height) {
     SkASSERT(0 == width % 2 && 0 == width % 2);
 
-    result->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+    result->setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
+                      kOpaque_SkAlphaType);
     result->allocPixels();
     SkAutoLockPixels lock(*result);
 
     SkPMColor* scanline = result->getAddr32(0, 0);
     for (int x = 0; x < width; ++x) {
         scanline[x] = SK_ColorRED;
     }
 
     for (int y = 1; y < height/2; ++y) {
         scanline = result->getAddr32(0, y);
@@ skipping 16 matching lines @@
         for (int x = width/2; x < width-1; ++x) {
             scanline[x] = SK_ColorBLACK;
         }
         scanline[width-1] = SK_ColorRED;
     }
 
     scanline = result->getAddr32(0, height-1);
     for (int x = 0; x < width; ++x) {
         scanline[x] = SK_ColorRED;
     }
-    result->setIsOpaque(true);
     result->setImmutable();
 }
 
 // This GM exercises the drawBitmapRectToRect "bleed" flag
 class BleedGM : public skiagm::GM {
 public:
     BleedGM() {}
 
 protected:
     virtual SkString onShortName() SK_OVERRIDE {
@@ skipping 148 matching lines @@
     static const int kSmallTextureSize = 4;
     static const int kMaxTextureSize = 32;
 
     SkBitmap fBitmapSmall;
     SkBitmap fBitmapBig;
 
     typedef GM INHERITED;
 };
 
 DEF_GM( return new BleedGM(); )