src/third_party/skia/bench/ImageFilterDAGBench.cpp

   1 /*
   2  * Copyright 2014 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "Benchmark.h"
   9 #include "SkBlurImageFilter.h"
  10 #include "SkCanvas.h"
  11 #include "SkMergeImageFilter.h"
  12
  13 enum { kNumInputs = 5 };
  14
  15 // Exercise a blur filter connected to 5 inputs of the same merge filter.
  16 // This bench shows an improvement in performance once cacheing of re-used
  17 // nodes is implemented, since the DAG is no longer flattened to a tree.
  18
  19 class ImageFilterDAGBench : public Benchmark {
  20 public:
  21     ImageFilterDAGBench() {}
  22
  23 protected:
  24     virtual const char* onGetName() SK_OVERRIDE {
  25         return "image_filter_dag";
  26     }
  27
  28     virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
  29         for (int j = 0; j < loops; j++) {
  30             SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(20.0f, 20.0f));
  31             SkImageFilter* inputs[kNumInputs];
  32             for (int i = 0; i < kNumInputs; ++i) {
  33                 inputs[i] = blur.get();
  34             }
  35             SkAutoTUnref<SkImageFilter> merge(SkMergeImageFilter::Create(inputs, kNumInputs));
  36             SkPaint paint;
  37             paint.setImageFilter(merge);
  38             SkRect rect = SkRect::Make(SkIRect::MakeWH(400, 400));
  39             canvas->drawRect(rect, paint);
  40         }
  41     }
  42
  43 private:
  44     typedef Benchmark INHERITED;
  45 };
  46
  47 DEF_BENCH(return new ImageFilterDAGBench;)