1 /*
2  * Copyright 2013 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 "SkCanvas.h"
10 #include "SkLayerDrawLooper.h"
11 #include "SkMaskFilter.h"
12 #include "SkPaint.h"
13 #include "SkPath.h"
14 #include "SkRandom.h"
15 
16 // This bench replicates a problematic use case of a draw looper used
17 // to create an inner blurred rect
18 class RectoriBench : public Benchmark {
19 public:
RectoriBench()20     RectoriBench() {}
21 
22 protected:
23 
onGetName()24     const char* onGetName() override {
25         return "rectori";
26     }
27 
onDraw(int loops,SkCanvas * canvas)28     void onDraw(int loops, SkCanvas* canvas) override {
29         SkRandom Random;
30 
31         for (int i = 0; i < loops; i++) {
32             SkScalar blurSigma = Random.nextRangeScalar(1.5f, 25.0f);
33             SkScalar size = Random.nextRangeScalar(20*blurSigma, 50*blurSigma);
34 
35             SkScalar x = Random.nextRangeScalar(0.0f, W - size);
36             SkScalar y = Random.nextRangeScalar(0.0f, H - size);
37 
38             SkRect inner = { x, y, x + size, y + size };
39 
40             SkRect outer(inner);
41             // outer is always outset either 2x or 4x the blur radius (we go with 2x)
42             outer.outset(2*blurSigma, 2*blurSigma);
43 
44             SkPath p;
45 
46             p.addRect(outer);
47             p.addRect(inner);
48             p.setFillType(SkPath::kEvenOdd_FillType);
49 
50             // This will be used to translate the normal draw outside the
51             // clip rect and translate the blurred version back inside
52             SkScalar translate = 2.0f * size;
53 
54             SkPaint paint;
55             paint.setLooper(this->createLooper(-translate, blurSigma));
56             paint.setColor(0xff000000 | Random.nextU());
57             paint.setAntiAlias(true);
58 
59             canvas->save();
60             // clip always equals inner rect so we get the inside blur
61             canvas->clipRect(inner);
62             canvas->translate(translate, 0);
63             canvas->drawPath(p, paint);
64             canvas->restore();
65         }
66     }
67 
68 private:
69     enum {
70         W = 640,
71         H = 480,
72     };
73 
createLooper(SkScalar xOff,SkScalar sigma)74     sk_sp<SkDrawLooper> createLooper(SkScalar xOff, SkScalar sigma) {
75         SkLayerDrawLooper::Builder looperBuilder;
76 
77         //-----------------------------------------------
78         SkLayerDrawLooper::LayerInfo info;
79 
80         // TODO: add a color filter to better match what is seen in the wild
81         info.fPaintBits = /* SkLayerDrawLooper::kColorFilter_Bit |*/
82                           SkLayerDrawLooper::kMaskFilter_Bit;
83         info.fColorMode = SkBlendMode::kDst;
84         info.fOffset.set(xOff, 0);
85         info.fPostTranslate = false;
86 
87         SkPaint* paint = looperBuilder.addLayer(info);
88 
89         paint->setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, sigma));
90 
91         //-----------------------------------------------
92         info.fPaintBits = 0;
93         info.fOffset.set(0, 0);
94 
95         paint = looperBuilder.addLayer(info);
96         return looperBuilder.detach();
97     }
98 
99     typedef Benchmark INHERITED;
100 };
101 
102 DEF_BENCH(return new RectoriBench();)
103