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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 "gm.h"
9 #include "SkPath.h"
10 #include "SkScan.h"
11 
12 #define W   800
13 #define H   800
14 
15 class AnalyticAntiAliasConvexGM : public skiagm::GM {
16 public:
AnalyticAntiAliasConvexGM()17     AnalyticAntiAliasConvexGM() {}
18 
19 protected:
20 
onShortName()21     SkString onShortName() override {
22         return SkString("analytic_antialias_convex");
23     }
24 
onISize()25     SkISize onISize() override {
26         return SkISize::Make(W, H);
27     }
28 
onDraw(SkCanvas * canvas)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);
42         canvas->drawRect({ 20, 20, 200, 200 }, p);
43         canvas->restore();
44 
45         y += 200;
46 
47         canvas->translate(0, y);
48         canvas->rotate(1);
49         canvas->drawRect({ 20, 20, 20.2f, 200 }, p);
50         canvas->drawRect({ 20, 200, 200, 200.1f }, p);
51         canvas->drawCircle(100, 100, 30, p);
52         canvas->restore();
53 
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);
64 
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);
78 
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();
90     }
91 
92 private:
93     typedef skiagm::GM INHERITED;
94 };
95 
96 class AnalyticAntiAliasGeneralGM : public skiagm::GM {
97 public:
AnalyticAntiAliasGeneralGM()98     AnalyticAntiAliasGeneralGM() {}
99 
100 protected:
101 
onShortName()102     SkString onShortName() override {
103         return SkString("analytic_antialias_general");
104     }
105 
onISize()106     SkISize onISize() override {
107         return SkISize::Make(W, H);
108     }
109 
onDraw(SkCanvas * canvas)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();
138 
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);
154     }
155 
156 private:
157     typedef skiagm::GM INHERITED;
158 };
159 
160 class AnalyticAntiAliasInverseGM : public skiagm::GM {
161 public:
AnalyticAntiAliasInverseGM()162     AnalyticAntiAliasInverseGM() {}
163 
164 protected:
165 
onShortName()166     SkString onShortName() override {
167         return SkString("analytic_antialias_inverse");
168     }
169 
onISize()170     SkISize onISize() override {
171         return SkISize::Make(W, H);
172     }
173 
onDraw(SkCanvas * canvas)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 
188 private:
189     typedef skiagm::GM INHERITED;
190 };
191 
192 DEF_GM( return new AnalyticAntiAliasConvexGM; )
193 DEF_GM( return new AnalyticAntiAliasGeneralGM; )
194 DEF_GM( return new AnalyticAntiAliasInverseGM; )
195