1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkAnimTimer.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkString.h"
/**
* In GM mode this draws an array of circles with different radii and different blur radii. Below
* each circle an almost-circle path is drawn with the same blur filter for comparison.
*
* In Sample mode this draws a single circle and almost-circle with animating radius and blur
* radius.
*/
class BlurCircles2GM : public skiagm::GM {
public:
BlurCircles2GM() {
fAnimRadius = SkAnimTimer::PingPong(0, kRadiusPingPoingPeriod, kRadiusPingPoingShift,
kMinRadius, kMaxRadius);
fAnimBlurRadius = SkAnimTimer::PingPong(0, kBlurRadiusPingPoingPeriod,
kBlurRadiusPingPoingShift, kMinBlurRadius,
kMaxBlurRadius);
}
protected:
SkString onShortName() override { return SkString("blurcircles2"); }
SkISize onISize() override {
return SkISize::Make(730, 1350);
}
void onDraw(SkCanvas* canvas) override {
static constexpr SkScalar kMaxR = kMaxRadius + kMaxBlurRadius;
auto almostCircleMaker = [] (SkScalar radius, SkPath* dst) {
dst->reset();
dst->addArc(SkRect::MakeXYWH(-radius, -radius, 2 * radius, 2 * radius), 0, 355);
dst->setIsVolatile(true);
dst->close();
};
auto blurMaker = [] (SkScalar radius) ->sk_sp<SkMaskFilter> {
return SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(radius),
SkBlurMaskFilter::kHighQuality_BlurFlag);
};
SkPaint paint;
paint.setColor(SK_ColorBLACK);
if (this->getMode() == kSample_Mode) {
paint.setMaskFilter(blurMaker(fAnimBlurRadius));
SkISize size = canvas->getBaseLayerSize();
SkPath almostCircle;
almostCircleMaker(fAnimRadius, &almostCircle);
canvas->save();
canvas->translate(size.fWidth / 2.f, size.fHeight / 4.f);
canvas->drawCircle(0, 0, fAnimRadius, paint);
canvas->translate(0, 2 * kMaxR);
canvas->drawPath(almostCircle, paint);
canvas->restore();
} else {
canvas->save();
static constexpr SkScalar kPad = 5;
static constexpr SkScalar kRadiusSteps = 5;
static constexpr SkScalar kBlurRadiusSteps = 5;
canvas->translate(kPad + kMinRadius + kMaxBlurRadius,
kPad + kMinRadius + kMaxBlurRadius);
SkScalar lineWidth = 0;
for (int r = 0; r < kRadiusSteps - 1; ++r) {
const SkScalar radius = r * (kMaxRadius - kMinRadius) / kBlurRadiusSteps +
kMinRadius;
lineWidth += 2 * (radius + kMaxBlurRadius) + kPad;
}
for (int br = 0; br < kBlurRadiusSteps; ++br) {
const SkScalar blurRadius = br * (kMaxBlurRadius - kMinBlurRadius) /
kBlurRadiusSteps + kMinBlurRadius;
const SkScalar maxRowR = blurRadius + kMaxRadius;
paint.setMaskFilter(blurMaker(blurRadius));
canvas->save();
for (int r = 0; r < kRadiusSteps; ++r) {
const SkScalar radius = r * (kMaxRadius - kMinRadius) / kBlurRadiusSteps +
kMinRadius;
SkPath almostCircle;
almostCircleMaker(radius, &almostCircle);
canvas->save();
canvas->drawCircle(0, 0, radius, paint);
canvas->translate(0, 2 * maxRowR + kPad);
canvas->drawPath(almostCircle, paint);
canvas->restore();
const SkScalar maxColR = radius + kMaxBlurRadius;
canvas->translate(maxColR * 2 + kPad, 0);
}
canvas->restore();
SkPaint blackPaint;
blackPaint.setColor(SK_ColorBLACK);
const SkScalar lineY = 3 * maxRowR + 1.5f * kPad;
if (br != kBlurRadiusSteps - 1) {
canvas->drawLine(0, lineY, lineWidth, lineY, blackPaint);
}
canvas->translate(0, maxRowR * 4 + 2 * kPad);
}
canvas->restore();
}
}
bool onAnimate(const SkAnimTimer& timer) override {
fAnimRadius = timer.pingPong(kRadiusPingPoingPeriod, kRadiusPingPoingShift, kMinRadius,
kMaxRadius);
fAnimBlurRadius = timer.pingPong(kBlurRadiusPingPoingPeriod, kBlurRadiusPingPoingShift,
kMinBlurRadius, kMaxBlurRadius);
return true;
}
private:
static constexpr SkScalar kMinRadius = 15;
static constexpr SkScalar kMaxRadius = 45;
static constexpr SkScalar kRadiusPingPoingPeriod = 8;
static constexpr SkScalar kRadiusPingPoingShift = 3;
static constexpr SkScalar kMinBlurRadius = 5;
static constexpr SkScalar kMaxBlurRadius = 45;
static constexpr SkScalar kBlurRadiusPingPoingPeriod = 3;
static constexpr SkScalar kBlurRadiusPingPoingShift = 1.5;
SkScalar fAnimRadius;
SkScalar fAnimBlurRadius;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new BlurCircles2GM();)
|
