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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Copyright 2014 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 "SkPath.h"
#include "SkScan.h"
#define W 800
#define H 800
class AnalyticAntiAliasConvexGM : public skiagm::GM {
public:
AnalyticAntiAliasConvexGM() {}
protected:
SkString onShortName() override {
return SkString("analytic_antialias_convex");
}
SkISize onISize() override {
return SkISize::Make(W, H);
}
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
canvas->clear(0xFFFFFFFF);
canvas->save();
SkScalar y = 0;
canvas->translate(0, y);
canvas->rotate(1);
canvas->drawRect({ 20, 20, 200, 200 }, p);
canvas->restore();
y += 200;
canvas->save();
canvas->translate(0, y);
canvas->rotate(1);
canvas->drawRect({ 20, 20, 20.2f, 200 }, p);
canvas->drawRect({ 20, 200, 200, 200.1f }, p);
canvas->drawCircle(100, 100, 30, p);
canvas->restore();
// The following path is empty but it'll reveal bug chrome:662914
SkPath path;
path.moveTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
// 77.8075f, 231.626f, 77.8074f, 231.625f, 77.8073f, 231.625f
path.cubicTo(SkBits2Float(0x429b9d71), SkBits2Float(0x4367a022),
SkBits2Float(0x429b9d64), SkBits2Float(0x4367a009),
SkBits2Float(0x429b9d50), SkBits2Float(0x43679ff2));
path.lineTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
path.close();
canvas->drawPath(path, p);
// The following path reveals a subtle SkAnalyticQuadraticEdge::updateQuadratic bug:
// we should not use any snapped y for the intermediate values whose error may accumulate;
// snapping should only be allowed once before updateLine.
path.reset();
path.moveTo(SkBits2Float(0x434ba71e), SkBits2Float(0x438a06d0)); // 203.653f, 276.053f
path.lineTo(SkBits2Float(0x43492a74), SkBits2Float(0x4396d70d)); // 201.166f, 301.68f
// 200.921f, 304.207f, 196.939f, 303.82f, 0.707107f
path.conicTo(SkBits2Float(0x4348ebaf), SkBits2Float(0x43981a75),
SkBits2Float(0x4344f079), SkBits2Float(0x4397e900), SkBits2Float(0x3f3504f3));
path.close();
// Manually setting convexity is required. Otherwise, this path will be considered concave.
path.setConvexity(SkPath::kConvex_Convexity);
canvas->drawPath(path, p);
// skbug.com/7573
y += 200;
canvas->save();
canvas->translate(0, y);
p.setAntiAlias(true);
path.reset();
path.moveTo(1.98009784f, 9.0162744f);
path.lineTo(47.843992f, 10.1922744f);
path.lineTo(47.804008f, 11.7597256f);
path.lineTo(1.93990216f, 10.5837256f);
canvas->drawPath(path, p);
canvas->restore();
// skbug.com/7813
// t8888 splits the 800-high canvas into 3 pieces; the boundary is close to 266 and 534
path.reset();
path.moveTo(700, 266);
path.lineTo(710, 266);
path.lineTo(710, 534);
path.lineTo(700, 534);
canvas->drawPath(path, p);
}
private:
typedef skiagm::GM INHERITED;
};
class AnalyticAntiAliasGeneralGM : public skiagm::GM {
public:
AnalyticAntiAliasGeneralGM() {}
protected:
SkString onShortName() override {
return SkString("analytic_antialias_general");
}
SkISize onISize() override {
return SkISize::Make(W, H);
}
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
canvas->clear(0xFFFFFFFF);
canvas->save();
canvas->rotate(1);
const SkScalar R = 115.2f, C = 128.0f;
SkPath path;
path.moveTo(C + R, C);
for (int i = 1; i < 8; ++i) {
SkScalar a = 2.6927937f * i;
SkScalar cosine;
SkScalar sine = SkScalarSinCos(a, &cosine);
path.lineTo(C + R * cosine, C + R * sine);
}
canvas->drawPath(path, p);
canvas->restore();
canvas->save();
canvas->translate(200, 0);
canvas->rotate(1);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(5);
canvas->drawPath(path, p);
canvas->restore();
// The following two paths test if we correctly cumulates the alpha on the middle pixel
// column where the left rect and the right rect abut.
p.setStyle(SkPaint::kFill_Style);
canvas->translate(0, 300);
path.reset();
path.addRect({20, 20, 100.4999f, 100});
path.addRect({100.5001f, 20, 200, 100});
canvas->drawPath(path, p);
canvas->translate(300, 0);
path.reset();
path.addRect({20, 20, 100.1f, 100});
path.addRect({100.9f, 20, 200, 100});
canvas->drawPath(path, p);
}
private:
typedef skiagm::GM INHERITED;
};
class AnalyticAntiAliasInverseGM : public skiagm::GM {
public:
AnalyticAntiAliasInverseGM() {}
protected:
SkString onShortName() override {
return SkString("analytic_antialias_inverse");
}
SkISize onISize() override {
return SkISize::Make(W, H);
}
void onDraw(SkCanvas* canvas) override {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
canvas->save();
SkPath path;
path.addCircle(100, 100, 30);
path.setFillType(SkPath::kInverseWinding_FillType);
canvas->drawPath(path, p);
canvas->restore();
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new AnalyticAntiAliasConvexGM; )
DEF_GM( return new AnalyticAntiAliasGeneralGM; )
DEF_GM( return new AnalyticAntiAliasInverseGM; )
|
