2 * Copyright 2014 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
15 class AnalyticAntiAliasConvexGM : public skiagm::GM {
17 AnalyticAntiAliasConvexGM() {}
21 SkString onShortName() override {
22 return SkString("analytic_antialias_convex");
25 SkISize onISize() override {
26 return SkISize::Make(W, H);
29 void onDraw(SkCanvas* canvas) override {
31 p.setColor(SK_ColorRED);
34 canvas->clear(0xFFFFFFFF);
40 canvas->translate(0, y);
42 canvas->drawRect({ 20, 20, 200, 200 }, p);
47 canvas->translate(0, y);
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);
54 // The following path is empty but it'll reveal bug chrome:662914
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
63 canvas->drawPath(path, p);
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.
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));
75 // Manually setting convexity is required. Otherwise, this path will be considered concave.
76 path.setConvexity(SkPath::kConvex_Convexity);
77 canvas->drawPath(path, p);
81 typedef skiagm::GM INHERITED;
84 class AnalyticAntiAliasGeneralGM : public skiagm::GM {
86 AnalyticAntiAliasGeneralGM() {}
90 SkString onShortName() override {
91 return SkString("analytic_antialias_general");
94 SkISize onISize() override {
95 return SkISize::Make(W, H);
98 void onDraw(SkCanvas* canvas) override {
100 p.setColor(SK_ColorRED);
101 p.setAntiAlias(true);
103 canvas->clear(0xFFFFFFFF);
107 const SkScalar R = 115.2f, C = 128.0f;
109 path.moveTo(C + R, C);
110 for (int i = 1; i < 8; ++i) {
111 SkScalar a = 2.6927937f * i;
113 SkScalar sine = SkScalarSinCos(a, &cosine);
114 path.lineTo(C + R * cosine, C + R * sine);
116 canvas->drawPath(path, p);
120 canvas->translate(200, 0);
122 p.setStyle(SkPaint::kStroke_Style);
124 canvas->drawPath(path, p);
129 typedef skiagm::GM INHERITED;
132 class AnalyticAntiAliasInverseGM : public skiagm::GM {
134 AnalyticAntiAliasInverseGM() {}
138 SkString onShortName() override {
139 return SkString("analytic_antialias_inverse");
142 SkISize onISize() override {
143 return SkISize::Make(W, H);
146 void onDraw(SkCanvas* canvas) override {
148 p.setColor(SK_ColorRED);
149 p.setAntiAlias(true);
154 path.addCircle(100, 100, 30);
155 path.setFillType(SkPath::kInverseWinding_FillType);
156 canvas->drawPath(path, p);
161 typedef skiagm::GM INHERITED;
164 DEF_GM( return new AnalyticAntiAliasConvexGM; )
165 DEF_GM( return new AnalyticAntiAliasGeneralGM; )
166 DEF_GM( return new AnalyticAntiAliasInverseGM; )