Add scanline decoding to SkCodec.

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 441 matching lines @@
  *
  */
 SkCodec::Result SkBmpCodec::onGetPixels(const SkImageInfo& dstInfo,
                                         void* dst, size_t dstRowBytes,
                                         const Options&,
                                         SkPMColor*, int*) {
     // Check for proper input and output formats
     if (!this->rewindIfNeeded()) {
         return kCouldNotRewind;
     }
-    if (dstInfo.dimensions() != this->getOriginalInfo().dimensions()) {
+    if (dstInfo.dimensions() != this->getInfo().dimensions()) {
         SkDebugf("Error: scaling not supported.\n");
         return kInvalidScale;
     }
-    if (!conversion_possible(dstInfo, this->getOriginalInfo())) {
+    if (!conversion_possible(dstInfo, this->getInfo())) {
         SkDebugf("Error: cannot convert input type to output type.\n");
         return kInvalidConversion;
     }
 
     // Create the color table if necessary and prepare the stream for decode
     if (!createColorTable(dstInfo.alphaType())) {
         SkDebugf("Error: could not create color table.\n");
         return kInvalidInput;
     }
 
@@ skipping 525 matching lines @@
                 }
                 dstRow = SkTAddOffset<SkPMColor>(dstRow, dstRowBytes);
             }
         }
     }
     */
 
     // Finished decoding the entire image
     return kSuccess;
 }