store SkAlphaType inside SkBitmap, on road to support unpremul

src/images/SkImageRef.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 "SkImageRef.h"
 #include "SkBitmap.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 46 matching lines @@
     SkASSERT(SkBitmap::kNo_Config != fBitmap.config());
     if (bitmap) {
         bitmap->setConfig(fBitmap.config(), fBitmap.width(), fBitmap.height());
     }
     return true;
 }
 
 bool SkImageRef::isOpaque(SkBitmap* bitmap) {
     if (bitmap && bitmap->pixelRef() == this) {
         bitmap->lockPixels();
-        bitmap->setIsOpaque(fBitmap.isOpaque());
+        // what about colortables??????
+        bitmap->setAlphaType(fBitmap.alphaType());
         bitmap->unlockPixels();
         return true;
     }
     return false;
 }
 
 SkImageDecoderFactory* SkImageRef::setDecoderFactory(
                                                 SkImageDecoderFactory* fact) {
     SkRefCnt_SafeAssign(fFactory, fact);
     return fact;
@@ skipping 114 matching lines @@
     // now.
     if (!fStream->rewind()) {
         SkDEBUGF(("Failed to rewind SkImageRef stream!"));
         buffer.write32(0);
     } else {
         // FIXME: Handle getLength properly here. Perhaps this class should
         // take an SkStreamAsset.
         buffer.writeStream(fStream, fStream->getLength());
     }
 }