Subset decoding benchmarks

bench/SubsetSingleBench.h

Index: bench/SubsetSingleBench.h
diff --git a/bench/SubsetSingleBench.h b/bench/SubsetSingleBench.h
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+++ b/bench/SubsetSingleBench.h
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+/*
+ * 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 "Benchmark.h"
+#include "SkImageDecoder.h"
+#include "SkImageInfo.h"
+#include "SkStream.h"
+#include "SkString.h"
+
+/*
+ *
+ * This benchmark is designed to test the performance of subset decoding.
+ * It uses an input width, height, left, and top to decode a single subset.
+ *
+ */
+class SubsetSingleBench : public Benchmark {
+public:
+
+    static SubsetSingleBench* Create(SkString* path,
+                                      SkColorType colorType,
+                                      uint32_t subsetWidth,
+                                      uint32_t subsetHeight,
+                                      uint32_t offsetLeft,
+                                      uint32_t offsetTop,
+                                      bool useCodec);
+
+protected:
+    const char* onGetName() override;
+    bool isSuitableFor(Backend backend) override;
+    void onDraw(const int n, SkCanvas* canvas) override;
+
+private:
+
+    SubsetSingleBench(SkString* path,
+                      SkColorType colorType,
+                      uint32_t subsetWidth,
+                      uint32_t subsetHeight,
+                      uint32_t offsetLeft,
+                      uint32_t offsetTop,
+                      bool useCodec);
+
+    SkString fName;
+    SkColorType fColorType;
+    const uint32_t fSubsetWidth;
+    const uint32_t fSubsetHeight;
+    const uint32_t fOffsetLeft;
+    const uint32_t fOffsetTop;
+    const bool fUseCodec;
+    SkAutoTDelete<SkMemoryStream> fStream;
+    typedef Benchmark INHERITED;
+};