Add subsetting to SkScanlineDecoder

bench/BitmapRegionDecoderBench.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 "BitmapRegionDecoderBench.h"
 #include "CodecBenchPriv.h"
 #include "SkBitmap.h"
-#include "SkCodecTools.h"
+#include "SkCodecPriv.h"
 #include "SkOSFile.h"
 
 BitmapRegionDecoderBench::BitmapRegionDecoderBench(const char* baseName, SkData* encoded,
         SkBitmapRegionDecoderInterface::Strategy strategy, SkColorType colorType,
         uint32_t sampleSize, const SkIRect& subset)
     : fBRD(nullptr)
     , fData(SkRef(encoded))
     , fStrategy(strategy)
     , fColorType(colorType)
     , fSampleSize(sampleSize)
@@ skipping 37 matching lines @@
 }
 
 void BitmapRegionDecoderBench::onDraw(int n, SkCanvas* canvas) {
     SkAutoTDelete<SkBitmap> bitmap;
     for (int i = 0; i < n; i++) {
         bitmap.reset(fBRD->decodeRegion(fSubset.left(), fSubset.top(), fSubset.width(),
                 fSubset.height(), fSampleSize, fColorType));
         SkASSERT(nullptr != bitmap.get());
     }
 }