Fix DMSrcSink bug

dm/DMSrcSink.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "DMSrcSink.h"
 #include "SamplePipeControllers.h"
 #include "SkAndroidCodec.h"
@@ skipping 246 matching lines @@
             }
             *decodeInfo = defaultInfo.makeColorType(kGray_8_SkColorType);
             break;
         default:
             *decodeInfo = defaultInfo.makeColorType(canvasColorType);
             break;
     }
 
     // FIXME: Currently we cannot draw unpremultiplied sources.
     if (decodeInfo->alphaType() == kUnpremul_SkAlphaType) {
-        decodeInfo->makeAlphaType(kPremul_SkAlphaType);
+        *decodeInfo = decodeInfo->makeAlphaType(kPremul_SkAlphaType);

[scroggo, 2015/10/27 13:59:04]

I wonder if makeAlphaType should be SK_WARN_UNUSED_RESULT...

     }
     return true;
 }
 
 Error CodecSrc::draw(SkCanvas* canvas) const {
     SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
     if (!encoded) {
         return SkStringPrintf("Couldn't read %s.", fPath.c_str());
     }
     SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(encoded));
@@ skipping 1090 matching lines @@
             skr.visit<void>(i, drawsAsSingletonPictures);
         }
         SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
 
         canvas->drawPicture(macroPic);
         return "";
     });
 }
 
 }  // namespace DM