1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkPathBuilder.h"
13 #include "include/core/SkPathEffect.h"
14 #include "include/core/SkPathMeasure.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkString.h"
18 #include "include/core/SkTypes.h"
19 #include "include/effects/SkDashPathEffect.h"
20 #include "include/utils/SkParsePath.h"
21 #include "include/utils/SkRandom.h"
22 #include "src/core/SkOSFile.h"
23 #include "tools/random_parse_path.h"
24
25 #include <stdio.h>
26
27 /* The test below generates a reference image using SVG. To compare the result for correctness,
28 enable the define below and then view the generated SVG in a browser.
29 */
30 static constexpr bool GENERATE_SVG_REFERENCE = false;
31
32 /*
33 The arcto test below should draw the same as this SVG:
34 (Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1)
35
36 <svg width="500" height="600">
37 <path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" />
38 <path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" />
39 <path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" />
40 <path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" />
41
42 <path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" />
43 <path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" />
44 <path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" />
45 <path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" />
46
47 <path d="M250,400 A120,80 0 0,0 250,500"
48 fill="none" stroke="red" stroke-width="5" />
49
50 <path d="M250,400 A120,80 0 1,1 250,500"
51 fill="none" stroke="green" stroke-width="5"/>
52
53 <path d="M250,400 A120,80 0 1,0 250,500"
54 fill="none" stroke="purple" stroke-width="5"/>
55
56 <path d="M250,400 A120,80 0 0,1 250,500"
57 fill="none" stroke="blue" stroke-width="5"/>
58
59 <path d="M100,100 A 0, 0 0 0,1 200,200"
60 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
61
62 <path d="M200,100 A 80,80 0 0,1 200,100"
63 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
64 </svg>
65 */
66
67 DEF_SIMPLE_GM(arcto, canvas, 500, 600) {
68 SkPaint paint;
69 paint.setAntiAlias(true);
70 paint.setStyle(SkPaint::kStroke_Style);
71 paint.setStrokeWidth(2);
72 paint.setColor(0xFF660000);
73 // canvas->scale(2, 2); // for testing on retina
74 SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100);
75
76 for (SkScalar angle = 0; angle <= 45; angle += 45) {
77 for (int oHeight = 2; oHeight >= 1; --oHeight) {
78 SkPathBuilder svgArc;
79 SkScalar ovalHeight = oval.height() / oHeight;
80 svgArc.moveTo(oval.fLeft, oval.fTop);
81 svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kSmall_ArcSize,
82 SkPathDirection::kCW, {oval.right(), oval.bottom()});
83 canvas->drawPath(svgArc.detach(), paint);
84
85 svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100);
86 svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kLarge_ArcSize,
87 SkPathDirection::kCCW, {oval.right(), oval.bottom() + 100});
88 canvas->drawPath(svgArc.detach(), paint);
89 oval.offset(50, 0);
90
91 }
92 }
93
94 paint.setStrokeWidth(5);
95 const SkColor purple = 0xFF800080;
96 const SkColor darkgreen = 0xFF008000;
97 const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE };
98 const char* arcstrs[] = {
99 "M250,400 A120,80 0 0,0 250,500",
100 "M250,400 A120,80 0 1,1 250,500",
101 "M250,400 A120,80 0 1,0 250,500",
102 "M250,400 A120,80 0 0,1 250,500"
103 };
104 int cIndex = 0;
105 for (const char* arcstr : arcstrs) {
106 SkPath path;
107 SkParsePath::FromSVGString(arcstr, &path);
108 paint.setColor(colors[cIndex++]);
109 canvas->drawPath(path, paint);
110 }
111
112 // test that zero length arcs still draw round cap
113 paint.setStrokeCap(SkPaint::kRound_Cap);
114 SkPathBuilder path;
115 path.moveTo(100, 100)
116 .arcTo({0, 0}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 200});
117 canvas->drawPath(path.detach(), paint);
118
119 path.moveTo(200, 100)
120 .arcTo({80, 80}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 100});
121 canvas->drawPath(path.detach(), paint);
122 }
123
124 enum {
125 kParsePathTestDimension = 500
126 };
127
DEF_SIMPLE_GM(parsedpaths,canvas,kParsePathTestDimension,kParsePathTestDimension)128 DEF_SIMPLE_GM(parsedpaths, canvas, kParsePathTestDimension, kParsePathTestDimension) {
129 SkString str;
130 FILE* file;
131 if (GENERATE_SVG_REFERENCE) {
132 file = sk_fopen("svgout.htm", kWrite_SkFILE_Flag);
133 str.printf("<svg width=\"%d\" height=\"%d\">\n", kParsePathTestDimension,
134 kParsePathTestDimension);
135 sk_fwrite(str.c_str(), str.size(), file);
136 }
137 SkRandom rand;
138 SkPaint paint;
139 paint.setAntiAlias(true);
140 for (int xStart = 0; xStart < kParsePathTestDimension; xStart += 100) {
141 canvas->save();
142 for (int yStart = 0; yStart < kParsePathTestDimension; yStart += 100) {
143 if (GENERATE_SVG_REFERENCE) {
144 str.printf("<g transform='translate(%d,%d) scale(%d,%d)'>\n", xStart, yStart,
145 1, 1);
146 sk_fwrite(str.c_str(), str.size(), file);
147 str.printf("<clipPath id='clip_%d_%d'>\n", xStart, yStart);
148 sk_fwrite(str.c_str(), str.size(), file);
149 str.printf("<rect width='100' height='100' x='0' y='0'></rect>\n");
150 sk_fwrite(str.c_str(), str.size(), file);
151 str.printf("</clipPath>\n");
152 sk_fwrite(str.c_str(), str.size(), file);
153 }
154 int count = 3;
155 do {
156 SkPath path;
157 SkString spec;
158 uint32_t y = rand.nextRangeU(30, 70);
159 uint32_t x = rand.nextRangeU(30, 70);
160 spec.printf("M %d,%d\n", x, y);
161 for (uint32_t i = rand.nextRangeU(0, 10); i--; ) {
162 spec.append(MakeRandomParsePathPiece(&rand));
163 }
164 SkAssertResult(SkParsePath::FromSVGString(spec.c_str(), &path));
165 paint.setColor(rand.nextU());
166 canvas->save();
167 canvas->clipRect(SkRect::MakeIWH(100, 100));
168 canvas->drawPath(path, paint);
169 canvas->restore();
170 if (GENERATE_SVG_REFERENCE) {
171 str.printf("<path d='\n");
172 sk_fwrite(str.c_str(), str.size(), file);
173 sk_fwrite(spec.c_str(), spec.size(), file);
174 str.printf("\n' fill='#%06x' fill-opacity='%g'", paint.getColor() & 0xFFFFFF,
175 paint.getAlpha() / 255.f);
176 sk_fwrite(str.c_str(), str.size(), file);
177 str.printf(" clip-path='url(#clip_%d_%d)'/>\n", xStart, yStart);
178 sk_fwrite(str.c_str(), str.size(), file);
179 }
180 } while (--count > 0);
181 if (GENERATE_SVG_REFERENCE) {
182 str.printf("</g>\n");
183 sk_fwrite(str.c_str(), str.size(), file);
184 }
185 canvas->translate(0, 100);
186 }
187 canvas->restore();
188 canvas->translate(100, 0);
189 }
190 if (GENERATE_SVG_REFERENCE) {
191 const char trailer[] = "</svg>\n";
192 sk_fwrite(trailer, sizeof(trailer) - 1, file);
193 sk_fclose(file);
194 }
195 }
196
197 DEF_SIMPLE_GM(bug593049, canvas, 300, 300) {
198 canvas->translate(111, 0);
199
200 SkPathBuilder p;
201 p.moveTo(-43.44464063610148f, 79.43535936389853f);
202 const SkScalar yOffset = 122.88f;
203 const SkScalar radius = 61.44f;
204 SkRect oval = SkRect::MakeXYWH(-radius, yOffset - radius, 2 * radius, 2 * radius);
205 p.arcTo(oval, 1.25f * 180, .5f * 180, false);
206
207 SkPaint paint;
208 paint.setStyle(SkPaint::kStroke_Style);
209 paint.setStrokeCap(SkPaint::kRound_Cap);
210 paint.setStrokeWidth(15.36f);
211
212 canvas->drawPath(p.detach(), paint);
213 }
214
215 DEF_SIMPLE_GM(bug583299, canvas, 300, 300) {
216 const char* d="M60,60 A50,50 0 0 0 160,60 A50,50 0 0 0 60,60z";
217 SkPaint p;
218 p.setStyle(SkPaint::kStroke_Style);
219 p.setStrokeWidth(100);
220 p.setAntiAlias(true);
221 p.setColor(0xFF008200);
222 p.setStrokeCap(SkPaint::kSquare_Cap);
223 SkPath path;
224 SkParsePath::FromSVGString(d, &path);
225 SkPathMeasure meas(path, false);
226 SkScalar length = meas.getLength();
227 SkScalar intervals[] = {0, length };
228 int intervalCount = (int) SK_ARRAY_COUNT(intervals);
229 p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0));
230 canvas->drawPath(path, p);
231 }
232