Add nanobench tests for BitmapRegionDecoder

bench/DecodingBench.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 "CodecBenchPriv.h"
 #include "DecodingBench.h"
 #include "SkBitmap.h"
 #include "SkData.h"
 #include "SkImageDecoder.h"
 #include "SkMallocPixelRef.h"
 #include "SkOSFile.h"
 #include "SkStream.h"
 
 /*
  *
  * This benchmark is designed to test the performance of image decoding.
  * It is invoked from the nanobench.cpp file.
  *
  */
 DecodingBench::DecodingBench(SkString path, SkColorType colorType)
     : fColorType(colorType)
     , fData(SkData::NewFromFileName(path.c_str()))
 {
     // Parse filename and the color type to give the benchmark a useful name
     SkString baseName = SkOSPath::Basename(path.c_str());
-    const char* colorName;
-    switch(colorType) {
-        case kN32_SkColorType:
-            colorName = "N32";
-            break;
-        case kRGB_565_SkColorType:
-            colorName = "565";
-            break;
-        case kAlpha_8_SkColorType:
-            colorName = "Alpha8";
-            break;
-        default:
-            colorName = "Unknown";
-    }
-    fName.printf("Decode_%s_%s", baseName.c_str(), colorName);
+    fName.printf("Decode_%s_%s", baseName.c_str(), color_type_to_str(colorType));
     
 #ifdef SK_DEBUG
     // Ensure that we can create a decoder.
     SkAutoTDelete<SkStreamRewindable> stream(new SkMemoryStream(fData));
     SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(stream));
     SkASSERT(decoder != nullptr);
 #endif
 }
 
 const char* DecodingBench::onGetName() {
@@ skipping 48 matching lines @@
     for (int i = 0; i < n; i++) {
         // create a new stream and a new decoder to mimic the behavior of
         // CodecBench.
         stream.reset(new SkMemoryStream(fData));
         decoder.reset(SkImageDecoder::Factory(stream));
         decoder->setAllocator(&allocator);
         decoder->decode(stream, &bitmap, fColorType,
                         SkImageDecoder::kDecodePixels_Mode);
     }
 }