store SkAlphaType inside SkBitmap, on road to support unpremul

bench/BitmapBench.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 110 matching lines @@
 
         if (SkBitmap::kIndex8_Config == fConfig) {
             convertToIndex666(bm, &fBitmap);
         } else {
             fBitmap = bm;
         }
 
         if (fBitmap.getColorTable()) {
             fBitmap.getColorTable()->setIsOpaque(fIsOpaque);
         }
-        fBitmap.setIsOpaque(fIsOpaque);
+        fBitmap.setAlphaType(fIsOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
         fBitmap.setIsVolatile(fIsVolatile);
     }
 
     virtual void onDraw(SkCanvas* canvas) {
         SkIPoint dim = this->getSize();
         SkRandom rand;
 
         SkPaint paint(fPaint);
         this->setupPaint(&paint);
 
@@ skipping 236 matching lines @@
 DEF_BENCH( return new FilterBitmapBench(true, SkBitmap::kARGB_8888_Config, true, false, kScale_Flag | kRotate_Flag | kBilerp_Flag); )
 
 DEF_BENCH( return new FilterBitmapBench(false, SkBitmap::kARGB_8888_Config, false, false, kScale_Flag | kBilerp_Flag | kBicubic_Flag); )
 DEF_BENCH( return new FilterBitmapBench(false, SkBitmap::kARGB_8888_Config, false, false, kScale_Flag | kRotate_Flag | kBilerp_Flag | kBicubic_Flag); )
 
 // source alpha tests -> S32A_Opaque_BlitRow32_{arm,neon}
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kOpaque_SourceAlpha, SkBitmap::kARGB_8888_Config); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kTransparent_SourceAlpha, SkBitmap::kARGB_8888_Config); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kTwoStripes_SourceAlpha, SkBitmap::kARGB_8888_Config); )
 DEF_BENCH( return new SourceAlphaBitmapBench(SourceAlphaBitmapBench::kThreeStripes_SourceAlpha, SkBitmap::kARGB_8888_Config); )