Option for SkCodec to treat dst as all zeroes.

src/codec/SkCodec_libbmp.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_libbmp.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 484 matching lines @@
     , fRemainingBytes(remainingBytes)
 {}
 
 /*
  *
  * Initiates the bitmap decode
  *
  */
 SkCodec::Result SkBmpCodec::onGetPixels(const SkImageInfo& dstInfo,
                                         void* dst, size_t dstRowBytes,
+                                        const Options&,
                                         SkPMColor*, int*) {
     if (!this->rewindIfNeeded()) {
         return kCouldNotRewind;
     }
     if (dstInfo.dimensions() != this->getOriginalInfo().dimensions()) {
         SkDebugf("Error: scaling not supported.\n");
         return kInvalidScale;
     }
     if (!conversion_possible(dstInfo, this->getOriginalInfo())) {
         SkDebugf("Error: cannot convert input type to output type.\n");
@@ skipping 322 matching lines @@
                 config = SkSwizzler::kBGRA;
             }
             break;
         default:
             SkASSERT(false);
             return kInvalidInput;
     }
 
     // Create swizzler
     SkSwizzler* swizzler = SkSwizzler::CreateSwizzler(config, fColorTable.get(),
-            dstInfo, dst, dstRowBytes, false);
+            dstInfo, dst, dstRowBytes, SkImageGenerator::kNo_ZeroInitialized);
 
     // Allocate space for a row buffer and a source for the swizzler
     SkAutoTDeleteArray<uint8_t> srcBuffer(SkNEW_ARRAY(uint8_t, rowBytes));
 
     // Iterate over rows of the image
     // FIXME: bool transparent = true;
     for (int y = 0; y < height; y++) {
         // Read a row of the input
         if (stream()->read(srcBuffer.get(), rowBytes) != rowBytes) {
             SkDebugf("Warning: incomplete input stream.\n");
@@ skipping 36 matching lines @@
                 }
                 dstRow = SkTAddOffset<SkPMColor>(dstRow, dstRowBytes);
             }
         }
     }
     */
 
     // Finished decoding the entire image
     return kSuccess;
 }