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      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;)
     48