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    }
23
24protected:
25    virtual const char* onGetName() SK_OVERRIDE {
26        return "image_filter_dag";
27    }
28
29    virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
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
42private:
43    typedef Benchmark INHERITED;
44};
45
46DEF_BENCH(return new ImageFilterDAGBench;)
47