Adding new benchmark to test image decoding performance.

bench/DecodeBench.cpp

-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "Benchmark.h"
-#include "SkBitmap.h"
-#include "SkCommandLineFlags.h"
-#include "SkImageDecoder.h"
-#include "SkOSFile.h"
-#include "SkString.h"
-#include "sk_tool_utils.h"
-
-DEFINE_string(decodeBenchFilename, "resources/CMYK.jpeg", "Path to image for DecodeBench.");
-
-class DecodeBench : public Benchmark {
-    const SkColorType fPrefColorType;
-    SkString          fName;
-public:
-    DecodeBench(SkColorType ct) : fPrefColorType(ct) {
-        SkString fname = SkOSPath::Basename(FLAGS_decodeBenchFilename[0]);
-        fName.printf("decode_%s_%s", sk_tool_utils::colortype_name(ct), fname.c_str());
-    }
-
-    bool isSuitableFor(Backend backend) SK_OVERRIDE {
-        return backend == kNonRendering_Backend;
-    }
-
-protected:
-    virtual const char* onGetName() {
-        return fName.c_str();
-    }
-
-    virtual void onDraw(const int loops, SkCanvas*) {
-        for (int i = 0; i < loops; i++) {
-            SkBitmap bm;
-            SkImageDecoder::DecodeFile(FLAGS_decodeBenchFilename[0], &bm, fPrefColorType,
-                                       SkImageDecoder::kDecodePixels_Mode);
-        }
-    }
-
-private:
-    typedef Benchmark INHERITED;
-};
-
-DEF_BENCH( return new DecodeBench(kN32_SkColorType); )
-DEF_BENCH( return new DecodeBench(kRGB_565_SkColorType); )
-DEF_BENCH( return new DecodeBench(kARGB_4444_SkColorType); )