Scanline decoding for bmp

src/codec/SkCodec_libpng.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_libpng.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
@@ skipping 722 matching lines @@
     }
 
     SkCodec::Result onSkipScanlines(int count) override {
         //when ongetScanlines is called it will skip to fCurrentRow
         fCurrentRow += count;
         return SkCodec::kSuccess;
     }
 
     bool onReallyHasAlpha() const override { return fHasAlpha; }
 
-    bool onRequiresPostYSampling() override {
-        return true;
+    SkScanlineOrder onGetScanlineOrder() const override {
+        return kNone_SkScanlineOrder;
     }
 
     SkEncodedFormat onGetEncodedFormat() const override { 
         return kPNG_SkEncodedFormat;
     }
 
 private:
     SkAutoTDelete<SkPngCodec>   fCodec;
     bool                        fHasAlpha;
     int                         fCurrentRow;
@@ skipping 25 matching lines @@
 
     const SkImageInfo& srcInfo = codec->getInfo();
     if (codec->fNumberPasses > 1) {
         // interlaced image
         return SkNEW_ARGS(SkPngInterlacedScanlineDecoder, (srcInfo, codec.detach()));
     }
 
     return SkNEW_ARGS(SkPngScanlineDecoder, (srcInfo, codec.detach()));
 }