store SkAlphaType inside SkBitmap, on road to support unpremul

bench/BitmapRectBench.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 "SkBenchmark.h"
 #include "SkBitmap.h"
 #include "SkPaint.h"
@@ skipping 48 matching lines @@
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         fName.printf("bitmaprect_%02X_%sfilter_%s",
                      fAlpha, fDoFilter ? "" : "no",
                      fSlightMatrix ? "trans" : "identity");
         return fName.c_str();
     }
 
     virtual void onPreDraw() SK_OVERRIDE {
         fBitmap.allocPixels();
-        fBitmap.setIsOpaque(true);
+        fBitmap.setAlphaType(kOpaque_SkAlphaType);
         fBitmap.eraseColor(SK_ColorBLACK);
         draw_into_bitmap(fBitmap);
 
         fSrcR.iset(0, 0, kWidth, kHeight);
         fDstR.iset(0, 0, kWidth, kHeight);
 
         if (fSlightMatrix) {
             // want fractional translate
             fDstR.offset(SK_Scalar1 / 3, SK_Scalar1 * 5 / 7);
             // want enough to create a scale matrix, but not enough to scare
@@ skipping 21 matching lines @@
     typedef SkBenchmark INHERITED;
 };
 
 DEF_BENCH(return new BitmapRectBench(0xFF, false, false))
 DEF_BENCH(return new BitmapRectBench(0x80, false, false))
 DEF_BENCH(return new BitmapRectBench(0xFF, true, false))
 DEF_BENCH(return new BitmapRectBench(0x80, true, false))
 
 DEF_BENCH(return new BitmapRectBench(0xFF, false, true))
 DEF_BENCH(return new BitmapRectBench(0xFF, true, true))