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liyuqiane60d8552016-10-03 13:49:37 -07001/*
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 "gm.h"
9#include "SkPath.h"
10#include "SkScan.h"
11
12#define W 800
13#define H 800
14
15class AnalyticAntiAliasConvexGM : public skiagm::GM {
16public:
17 AnalyticAntiAliasConvexGM() {}
18
19protected:
20
21 SkString onShortName() override {
22 return SkString("analytic_antialias_convex");
23 }
24
25 SkISize onISize() override {
26 return SkISize::Make(W, H);
27 }
28
29 void onDraw(SkCanvas* canvas) override {
30 SkPaint p;
31 p.setColor(SK_ColorRED);
32 p.setAntiAlias(true);
33
34 canvas->clear(0xFFFFFFFF);
35
36 canvas->save();
37
38 SkScalar y = 0;
39
40 canvas->translate(0, y);
41 canvas->rotate(1);
Mike Reed3661bc92017-02-22 13:21:42 -050042 canvas->drawRect({ 20, 20, 200, 200 }, p);
liyuqiane60d8552016-10-03 13:49:37 -070043 canvas->restore();
44
45 y += 200;
46
47 canvas->translate(0, y);
48 canvas->rotate(1);
Mike Reed3661bc92017-02-22 13:21:42 -050049 canvas->drawRect({ 20, 20, 20.2f, 200 }, p);
50 canvas->drawRect({ 20, 200, 200, 200.1f }, p);
liyuqiane60d8552016-10-03 13:49:37 -070051 canvas->drawCircle(100, 100, 30, p);
52 canvas->restore();
liyuqian451ceba2016-11-07 08:10:44 -080053
54 // The following path is empty but it'll reveal bug chrome:662914
55 SkPath path;
56 path.moveTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
57 // 77.8075f, 231.626f, 77.8074f, 231.625f, 77.8073f, 231.625f
58 path.cubicTo(SkBits2Float(0x429b9d71), SkBits2Float(0x4367a022),
59 SkBits2Float(0x429b9d64), SkBits2Float(0x4367a009),
60 SkBits2Float(0x429b9d50), SkBits2Float(0x43679ff2));
61 path.lineTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
62 path.close();
63 canvas->drawPath(path, p);
Yuqian Li0038b7f2016-11-14 11:51:41 -050064
65 // The following path reveals a subtle SkAnalyticQuadraticEdge::updateQuadratic bug:
66 // we should not use any snapped y for the intermediate values whose error may accumulate;
67 // snapping should only be allowed once before updateLine.
68 path.reset();
69 path.moveTo(SkBits2Float(0x434ba71e), SkBits2Float(0x438a06d0)); // 203.653f, 276.053f
70 path.lineTo(SkBits2Float(0x43492a74), SkBits2Float(0x4396d70d)); // 201.166f, 301.68f
71 // 200.921f, 304.207f, 196.939f, 303.82f, 0.707107f
72 path.conicTo(SkBits2Float(0x4348ebaf), SkBits2Float(0x43981a75),
73 SkBits2Float(0x4344f079), SkBits2Float(0x4397e900), SkBits2Float(0x3f3504f3));
74 path.close();
75 // Manually setting convexity is required. Otherwise, this path will be considered concave.
76 path.setConvexity(SkPath::kConvex_Convexity);
77 canvas->drawPath(path, p);
Yuqian Li4a657ad2018-02-07 19:04:34 +080078
79 // skbug.com/7573
80 y += 200;
81 canvas->translate(0, y);
82 p.setAntiAlias(true);
83 path.reset();
84 path.moveTo(1.98009784f, 9.0162744f);
85 path.lineTo(47.843992f, 10.1922744f);
86 path.lineTo(47.804008f, 11.7597256f);
87 path.lineTo(1.93990216f, 10.5837256f);
88 canvas->drawPath(path, p);
89 canvas->restore();
liyuqiane60d8552016-10-03 13:49:37 -070090 }
91
92private:
93 typedef skiagm::GM INHERITED;
94};
95
Yuqian Li131c1fb2016-12-12 16:24:47 -050096class AnalyticAntiAliasGeneralGM : public skiagm::GM {
97public:
98 AnalyticAntiAliasGeneralGM() {}
99
100protected:
101
102 SkString onShortName() override {
103 return SkString("analytic_antialias_general");
104 }
105
106 SkISize onISize() override {
107 return SkISize::Make(W, H);
108 }
109
110 void onDraw(SkCanvas* canvas) override {
111 SkPaint p;
112 p.setColor(SK_ColorRED);
113 p.setAntiAlias(true);
114
115 canvas->clear(0xFFFFFFFF);
116
117 canvas->save();
118 canvas->rotate(1);
119 const SkScalar R = 115.2f, C = 128.0f;
120 SkPath path;
121 path.moveTo(C + R, C);
122 for (int i = 1; i < 8; ++i) {
123 SkScalar a = 2.6927937f * i;
124 SkScalar cosine;
125 SkScalar sine = SkScalarSinCos(a, &cosine);
126 path.lineTo(C + R * cosine, C + R * sine);
127 }
128 canvas->drawPath(path, p);
129 canvas->restore();
130
131 canvas->save();
132 canvas->translate(200, 0);
133 canvas->rotate(1);
134 p.setStyle(SkPaint::kStroke_Style);
135 p.setStrokeWidth(5);
136 canvas->drawPath(path, p);
137 canvas->restore();
Yuqian Lifbe07932017-11-07 11:19:52 -0500138
139
140 // The following two paths test if we correctly cumulates the alpha on the middle pixel
141 // column where the left rect and the right rect abut.
142 p.setStyle(SkPaint::kFill_Style);
143 canvas->translate(0, 300);
144 path.reset();
145 path.addRect({20, 20, 100.4999f, 100});
146 path.addRect({100.5001f, 20, 200, 100});
147 canvas->drawPath(path, p);
148
149 canvas->translate(300, 0);
150 path.reset();
151 path.addRect({20, 20, 100.1f, 100});
152 path.addRect({100.9f, 20, 200, 100});
153 canvas->drawPath(path, p);
Yuqian Li131c1fb2016-12-12 16:24:47 -0500154 }
155
156private:
157 typedef skiagm::GM INHERITED;
158};
159
160class AnalyticAntiAliasInverseGM : public skiagm::GM {
161public:
162 AnalyticAntiAliasInverseGM() {}
163
164protected:
165
166 SkString onShortName() override {
167 return SkString("analytic_antialias_inverse");
168 }
169
170 SkISize onISize() override {
171 return SkISize::Make(W, H);
172 }
173
174 void onDraw(SkCanvas* canvas) override {
175 SkPaint p;
176 p.setColor(SK_ColorRED);
177 p.setAntiAlias(true);
178
179 canvas->save();
180
181 SkPath path;
182 path.addCircle(100, 100, 30);
183 path.setFillType(SkPath::kInverseWinding_FillType);
184 canvas->drawPath(path, p);
185 canvas->restore();
186 }
187
188private:
189 typedef skiagm::GM INHERITED;
190};
191
liyuqiane60d8552016-10-03 13:49:37 -0700192DEF_GM( return new AnalyticAntiAliasConvexGM; )
Yuqian Li131c1fb2016-12-12 16:24:47 -0500193DEF_GM( return new AnalyticAntiAliasGeneralGM; )
194DEF_GM( return new AnalyticAntiAliasInverseGM; )