Add nanobench tests for BitmapRegionDecoder

SkBitmapRegionDecoderInterface provides an interface
for multiple implementations of Android's
BitmapRegionDecoder.

We already have correctness tests in DM that will enable us
to compare the quality of our various BRD implementations.

We also need these performance tests to compare the speed
of our various implementations.

BUG=skia:4357

Review URL: https://codereview.chromium.org/1344993003

1 files changed, 49 insertions, 0 deletions

diff --git a/bench/BitmapRegionDecoderBench.h b/bench/BitmapRegionDecoderBench.h
new file mode 100644
index 0000000000..7be770f472
--- /dev/null
+++ b/bench/BitmapRegionDecoderBench.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef BitmapRegionDecoderBench_DEFINED
+#define BitmapRegionDecoderBench_DEFINED
+
+#include "Benchmark.h"
+#include "SkBitmapRegionDecoderInterface.h"
+#include "SkData.h"
+#include "SkImageInfo.h"
+#include "SkRefCnt.h"
+#include "SkString.h"
+
+/**
+ *  Benchmark Android's BitmapRegionDecoder for a particular colorType, sampleSize, and subset.
+ *
+ *  fStrategy determines which of various implementations is to be used.
+ *
+ *  nanobench.cpp handles creating benchmarks for interesting scaled subsets.  We strive to test
+ *  on real use cases.
+ */
+class BitmapRegionDecoderBench : public Benchmark {
+public:
+    // Calls encoded->ref()
+    BitmapRegionDecoderBench(const char* basename, SkData* encoded,
+            SkBitmapRegionDecoderInterface::Strategy strategy, SkColorType colorType,
+            uint32_t sampleSize, const SkIRect& subset);
+
+protected:
+    const char* onGetName() override;
+    bool isSuitableFor(Backend backend) override;
+    void onDraw(const int n, SkCanvas* canvas) override;
+    void onPreDraw() override;
+
+private:
+    SkString                                       fName;
+    SkAutoTDelete<SkBitmapRegionDecoderInterface>  fBRD;
+    SkAutoTUnref<SkData>                           fData;
+    const SkBitmapRegionDecoderInterface::Strategy fStrategy;
+    const SkColorType                              fColorType;
+    const uint32_t                                 fSampleSize;
+    const SkIRect                                  fSubset;
+    typedef Benchmark INHERITED;
+};
+#endif // BitmapRegionDecoderBench_DEFINED