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
13enum { 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
19class ImageFilterDAGBench : public Benchmark {
20public:
21    ImageFilterDAGBench() {}
22
23protected:
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
43private:
44    typedef Benchmark INHERITED;
45};
46
47DEF_BENCH(return new ImageFilterDAGBench;)
48