Support decoding opaque to *premul

src/codec/SkSampledCodec.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 "SkCodec.h"
 #include "SkCodecPriv.h"
 #include "SkMath.h"
@@ skipping 235 matching lines @@
                     }
                 }
             }
 
             if (nativeSize.height() == y) {
                 return SkCodec::kSuccess;
             }
 
             // We handle filling uninitialized memory here instead of using this->codec().
             // this->codec() does not know that we are sampling.
-            const uint32_t fillValue = this->codec()->getFillValue(info.colorType(),
-                    info.alphaType());
+            const uint32_t fillValue = this->codec()->getFillValue(info.colorType());
             const SkImageInfo fillInfo = info.makeWH(info.width(), 1);
             for (; y < nativeSize.height(); y++) {
                 int srcY = this->codec()->outputScanline(y);
                 if (!is_coord_necessary(srcY, sampleY, dstHeight)) {
                     continue;
                 }
 
                 void* rowPtr = SkTAddOffset<void>(pixels, rowBytes * get_dst_coord(srcY, sampleY));
                 SkSampler::Fill(fillInfo, rowPtr, rowBytes, fillValue, options.fZeroInitialized);
             }
@@ skipping 21 matching lines @@
                 // this->codec() has already handled filling uninitialized memory.
                 return SkCodec::kIncompleteInput;
             }
             return SkCodec::kSuccess;
         }
         default:
             SkASSERT(false);
             return SkCodec::kUnimplemented;
     }
 }