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 "src/base/SkRandom.h"
22 #include "src/core/SkOSFile.h"
23
24 #include <stdio.h>
25
26 /* The test below generates a reference image using SVG. To compare the result for correctness,
27 enable the define below and then view the generated SVG in a browser.
28 */
29 static constexpr bool GENERATE_SVG_REFERENCE = false;
30
31 /*
32 The arcto test below should draw the same as this SVG:
33 (Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1)
34
35 <svg width="500" height="600">
36 <path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" />
37 <path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" />
38 <path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" />
39 <path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" />
40
41 <path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" />
42 <path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" />
43 <path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" />
44 <path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" />
45
46 <path d="M250,400 A120,80 0 0,0 250,500"
47 fill="none" stroke="red" stroke-width="5" />
48
49 <path d="M250,400 A120,80 0 1,1 250,500"
50 fill="none" stroke="green" stroke-width="5"/>
51
52 <path d="M250,400 A120,80 0 1,0 250,500"
53 fill="none" stroke="purple" stroke-width="5"/>
54
55 <path d="M250,400 A120,80 0 0,1 250,500"
56 fill="none" stroke="blue" stroke-width="5"/>
57
58 <path d="M100,100 A 0, 0 0 0,1 200,200"
59 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
60
61 <path d="M200,100 A 80,80 0 0,1 200,100"
62 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
63 </svg>
64 */
65
66 DEF_SIMPLE_GM(arcto, canvas, 500, 600) {
67 SkPaint paint;
68 paint.setAntiAlias(true);
69 paint.setStyle(SkPaint::kStroke_Style);
70 paint.setStrokeWidth(2);
71 paint.setColor(0xFF660000);
72 // canvas->scale(2, 2); // for testing on retina
73 SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100);
74
75 for (SkScalar angle = 0; angle <= 45; angle += 45) {
76 for (int oHeight = 2; oHeight >= 1; --oHeight) {
77 SkPathBuilder svgArc;
78 SkScalar ovalHeight = oval.height() / oHeight;
79 svgArc.moveTo(oval.fLeft, oval.fTop);
80 svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kSmall_ArcSize,
81 SkPathDirection::kCW, {oval.right(), oval.bottom()});
82 canvas->drawPath(svgArc.detach(), paint);
83
84 svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100);
85 svgArc.arcTo({oval.width() / 2, ovalHeight}, angle, SkPathBuilder::kLarge_ArcSize,
86 SkPathDirection::kCCW, {oval.right(), oval.bottom() + 100});
87 canvas->drawPath(svgArc.detach(), paint);
88 oval.offset(50, 0);
89
90 }
91 }
92
93 paint.setStrokeWidth(5);
94 const SkColor purple = 0xFF800080;
95 const SkColor darkgreen = 0xFF008000;
96 const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE };
97 const char* arcstrs[] = {
98 "M250,400 A120,80 0 0,0 250,500",
99 "M250,400 A120,80 0 1,1 250,500",
100 "M250,400 A120,80 0 1,0 250,500",
101 "M250,400 A120,80 0 0,1 250,500"
102 };
103 int cIndex = 0;
104 for (const char* arcstr : arcstrs) {
105 SkPath path;
106 SkParsePath::FromSVGString(arcstr, &path);
107 paint.setColor(colors[cIndex++]);
108 canvas->drawPath(path, paint);
109 }
110
111 // test that zero length arcs still draw round cap
112 paint.setStrokeCap(SkPaint::kRound_Cap);
113 SkPathBuilder path;
114 path.moveTo(100, 100)
115 .arcTo({0, 0}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 200});
116 canvas->drawPath(path.detach(), paint);
117
118 path.moveTo(200, 100)
119 .arcTo({80, 80}, 0, SkPathBuilder::kLarge_ArcSize, SkPathDirection::kCW, {200, 100});
120 canvas->drawPath(path.detach(), paint);
121 }
122
123 enum {
124 kParsePathTestDimension = 500
125 };
126
127 const struct Legal {
128 char fSymbol;
129 int fScalars;
130 } gLegal[] = {
131 { 'M', 2 },
132 { 'H', 1 },
133 { 'V', 1 },
134 { 'L', 2 },
135 { 'Q', 4 },
136 { 'T', 2 },
137 { 'C', 6 },
138 { 'S', 4 },
139 { 'A', 4 },
140 { 'Z', 0 },
141 };
142
143 bool gEasy = false; // set to true while debugging to suppress unusual whitespace
144
145 // mostly do nothing, then bias towards spaces
146 const char gWhiteSpace[] = { 0, 0, 0, 0, 0, 0, 0, 0, ' ', ' ', ' ', ' ', 0x09, 0x0D, 0x0A };
147
add_white(SkRandom * rand,SkString * atom)148 static void add_white(SkRandom* rand, SkString* atom) {
149 if (gEasy) {
150 atom->append(" ");
151 return;
152 }
153 int reps = rand->nextRangeU(0, 2);
154 for (int rep = 0; rep < reps; ++rep) {
155 int index = rand->nextRangeU(0, (int) std::size(gWhiteSpace) - 1);
156 if (gWhiteSpace[index]) {
157 atom->append(&gWhiteSpace[index], 1);
158 }
159 }
160 }
161
add_comma(SkRandom * rand,SkString * atom)162 static void add_comma(SkRandom* rand, SkString* atom) {
163 if (gEasy) {
164 atom->append(",");
165 return;
166 }
167 size_t count = atom->size();
168 add_white(rand, atom);
169 if (rand->nextBool()) {
170 atom->append(",");
171 }
172 do {
173 add_white(rand, atom);
174 } while (count == atom->size());
175 }
176
add_some_white(SkRandom * rand,SkString * atom)177 static void add_some_white(SkRandom* rand, SkString* atom) {
178 size_t count = atom->size();
179 do {
180 add_white(rand, atom);
181 } while (count == atom->size());
182 }
183
make_random_svg_path(SkRandom * rand)184 static SkString make_random_svg_path(SkRandom* rand) {
185 SkString atom;
186 int legalIndex = rand->nextRangeU(0, (int) std::size(gLegal) - 1);
187 const Legal& legal = gLegal[legalIndex];
188 gEasy ? atom.append("\n") : add_white(rand, &atom);
189 char symbol = legal.fSymbol | (rand->nextBool() ? 0x20 : 0);
190 atom.append(&symbol, 1);
191 int reps = rand->nextRangeU(1, 3);
192 for (int rep = 0; rep < reps; ++rep) {
193 for (int index = 0; index < legal.fScalars; ++index) {
194 SkScalar coord = rand->nextRangeF(0, 100);
195 add_white(rand, &atom);
196 atom.appendScalar(coord);
197 if (rep < reps - 1 && index < legal.fScalars - 1) {
198 add_comma(rand, &atom);
199 } else {
200 add_some_white(rand, &atom);
201 }
202 if ('A' == legal.fSymbol && 1 == index) {
203 atom.appendScalar(rand->nextRangeF(-720, 720));
204 add_comma(rand, &atom);
205 atom.appendU32(rand->nextRangeU(0, 1));
206 add_comma(rand, &atom);
207 atom.appendU32(rand->nextRangeU(0, 1));
208 add_comma(rand, &atom);
209 }
210 }
211 }
212 return atom;
213 }
214
DEF_SIMPLE_GM(parsedpaths,canvas,kParsePathTestDimension,kParsePathTestDimension)215 DEF_SIMPLE_GM(parsedpaths, canvas, kParsePathTestDimension, kParsePathTestDimension) {
216 SkString str;
217 FILE* file;
218 if (GENERATE_SVG_REFERENCE) {
219 file = sk_fopen("svgout.htm", kWrite_SkFILE_Flag);
220 str.printf("<svg width=\"%d\" height=\"%d\">\n", kParsePathTestDimension,
221 kParsePathTestDimension);
222 sk_fwrite(str.c_str(), str.size(), file);
223 }
224 SkRandom rand;
225 SkPaint paint;
226 paint.setAntiAlias(true);
227 for (int xStart = 0; xStart < kParsePathTestDimension; xStart += 100) {
228 canvas->save();
229 for (int yStart = 0; yStart < kParsePathTestDimension; yStart += 100) {
230 if (GENERATE_SVG_REFERENCE) {
231 str.printf("<g transform='translate(%d,%d) scale(%d,%d)'>\n", xStart, yStart,
232 1, 1);
233 sk_fwrite(str.c_str(), str.size(), file);
234 str.printf("<clipPath id='clip_%d_%d'>\n", xStart, yStart);
235 sk_fwrite(str.c_str(), str.size(), file);
236 str.printf("<rect width='100' height='100' x='0' y='0'></rect>\n");
237 sk_fwrite(str.c_str(), str.size(), file);
238 str.printf("</clipPath>\n");
239 sk_fwrite(str.c_str(), str.size(), file);
240 }
241 int count = 3;
242 do {
243 SkPath path;
244 SkString spec;
245 uint32_t y = rand.nextRangeU(30, 70);
246 uint32_t x = rand.nextRangeU(30, 70);
247 spec.printf("M %u,%u\n", x, y);
248 for (uint32_t i = rand.nextRangeU(0, 10); i--; ) {
249 spec.append(make_random_svg_path(&rand));
250 }
251 SkAssertResult(SkParsePath::FromSVGString(spec.c_str(), &path));
252 paint.setColor(rand.nextU());
253 canvas->save();
254 canvas->clipRect(SkRect::MakeIWH(100, 100));
255 canvas->drawPath(path, paint);
256 canvas->restore();
257 if (GENERATE_SVG_REFERENCE) {
258 str.printf("<path d='\n");
259 sk_fwrite(str.c_str(), str.size(), file);
260 sk_fwrite(spec.c_str(), spec.size(), file);
261 str.printf("\n' fill='#%06x' fill-opacity='%g'", paint.getColor() & 0xFFFFFF,
262 paint.getAlpha() / 255.f);
263 sk_fwrite(str.c_str(), str.size(), file);
264 str.printf(" clip-path='url(#clip_%d_%d)'/>\n", xStart, yStart);
265 sk_fwrite(str.c_str(), str.size(), file);
266 }
267 } while (--count > 0);
268 if (GENERATE_SVG_REFERENCE) {
269 str.printf("</g>\n");
270 sk_fwrite(str.c_str(), str.size(), file);
271 }
272 canvas->translate(0, 100);
273 }
274 canvas->restore();
275 canvas->translate(100, 0);
276 }
277 if (GENERATE_SVG_REFERENCE) {
278 const char trailer[] = "</svg>\n";
279 sk_fwrite(trailer, sizeof(trailer) - 1, file);
280 sk_fclose(file);
281 }
282 }
283
284 DEF_SIMPLE_GM(bug593049, canvas, 300, 300) {
285 canvas->translate(111, 0);
286
287 SkPathBuilder p;
288 p.moveTo(-43.44464063610148f, 79.43535936389853f);
289 const SkScalar yOffset = 122.88f;
290 const SkScalar radius = 61.44f;
291 SkRect oval = SkRect::MakeXYWH(-radius, yOffset - radius, 2 * radius, 2 * radius);
292 p.arcTo(oval, 1.25f * 180, .5f * 180, false);
293
294 SkPaint paint;
295 paint.setStyle(SkPaint::kStroke_Style);
296 paint.setStrokeCap(SkPaint::kRound_Cap);
297 paint.setStrokeWidth(15.36f);
298
299 canvas->drawPath(p.detach(), paint);
300 }
301
302 DEF_SIMPLE_GM(bug583299, canvas, 300, 300) {
303 const char* d="M60,60 A50,50 0 0 0 160,60 A50,50 0 0 0 60,60z";
304 SkPaint p;
305 p.setStyle(SkPaint::kStroke_Style);
306 p.setStrokeWidth(100);
307 p.setAntiAlias(true);
308 p.setColor(0xFF008200);
309 p.setStrokeCap(SkPaint::kSquare_Cap);
310 SkPath path;
311 SkParsePath::FromSVGString(d, &path);
312 SkPathMeasure meas(path, false);
313 SkScalar length = meas.getLength();
314 SkScalar intervals[] = {0, length };
315 int intervalCount = (int) std::size(intervals);
316 p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0));
317 canvas->drawPath(path, p);
318 }
319