1 /*
2 * Copyright 2015 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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkMatrix.h"
12 #include "include/core/SkPaint.h"
13 #include "include/core/SkPath.h"
14 #include "include/core/SkPoint.h"
15 #include "include/core/SkRect.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkSize.h"
18 #include "include/core/SkString.h"
19 #include "include/core/SkTypes.h"
20 #include "src/core/SkPathPriv.h"
21
22 #include <memory>
23
create_ngon(int n,SkPoint * pts,SkScalar width,SkScalar height)24 static void create_ngon(int n, SkPoint* pts, SkScalar width, SkScalar height) {
25 float angleStep = 360.0f / n, angle = 0.0f;
26 if ((n % 2) == 1) {
27 angle = angleStep/2.0f;
28 }
29
30 for (int i = 0; i < n; ++i) {
31 pts[i].fX = -SkScalarSin(SkDegreesToRadians(angle)) * width;
32 pts[i].fY = SkScalarCos(SkDegreesToRadians(angle)) * height;
33 angle += angleStep;
34 }
35 }
36
37 namespace ConvexLineOnlyData {
38 // narrow rect
39 const SkPoint gPoints0[] = {
40 { -1.5f, -50.0f },
41 { 1.5f, -50.0f },
42 { 1.5f, 50.0f },
43 { -1.5f, 50.0f }
44 };
45 // narrow rect on an angle
46 const SkPoint gPoints1[] = {
47 { -50.0f, -49.0f },
48 { -49.0f, -50.0f },
49 { 50.0f, 49.0f },
50 { 49.0f, 50.0f }
51 };
52 // trap - narrow on top - wide on bottom
53 const SkPoint gPoints2[] = {
54 { -10.0f, -50.0f },
55 { 10.0f, -50.0f },
56 { 50.0f, 50.0f },
57 { -50.0f, 50.0f }
58 };
59 // wide skewed rect
60 const SkPoint gPoints3[] = {
61 { -50.0f, -50.0f },
62 { 0.0f, -50.0f },
63 { 50.0f, 50.0f },
64 { 0.0f, 50.0f }
65 };
66 // thin rect with colinear-ish lines
67 const SkPoint gPoints4[] = {
68 { -6.0f, -50.0f },
69 { 4.0f, -50.0f },
70 { 5.0f, -25.0f }, // remove if collinear diagonal points are not concave
71 { 6.0f, 0.0f },
72 { 5.0f, 25.0f }, // remove if collinear diagonal points are not concave
73 { 4.0f, 50.0f },
74 { -4.0f, 50.0f }
75 };
76 // degenerate
77 const SkPoint gPoints5[] = {
78 { -0.025f, -0.025f },
79 { 0.025f, -0.025f },
80 { 0.025f, 0.025f },
81 { -0.025f, 0.025f }
82 };
83 // Triangle in which the first point should fuse with last
84 const SkPoint gPoints6[] = {
85 { -20.0f, -13.0f },
86 { -20.0f, -13.05f },
87 { 20.0f, -13.0f },
88 { 20.0f, 27.0f }
89 };
90 // thin rect with colinear lines
91 const SkPoint gPoints7[] = {
92 { -10.0f, -50.0f },
93 { 10.0f, -50.0f },
94 { 10.0f, -25.0f },
95 { 10.0f, 0.0f },
96 { 10.0f, 25.0f },
97 { 10.0f, 50.0f },
98 { -10.0f, 50.0f }
99 };
100 // capped teardrop
101 const SkPoint gPoints8[] = {
102 { 50.00f, 50.00f },
103 { 0.00f, 50.00f },
104 { -15.45f, 47.55f },
105 { -29.39f, 40.45f },
106 { -40.45f, 29.39f },
107 { -47.55f, 15.45f },
108 { -50.00f, 0.00f },
109 { -47.55f, -15.45f },
110 { -40.45f, -29.39f },
111 { -29.39f, -40.45f },
112 { -15.45f, -47.55f },
113 { 0.00f, -50.00f },
114 { 50.00f, -50.00f }
115 };
116 // teardrop
117 const SkPoint gPoints9[] = {
118 { 4.39f, 40.45f },
119 { -9.55f, 47.55f },
120 { -25.00f, 50.00f },
121 { -40.45f, 47.55f },
122 { -54.39f, 40.45f },
123 { -65.45f, 29.39f },
124 { -72.55f, 15.45f },
125 { -75.00f, 0.00f },
126 { -72.55f, -15.45f },
127 { -65.45f, -29.39f },
128 { -54.39f, -40.45f },
129 { -40.45f, -47.55f },
130 { -25.0f, -50.0f },
131 { -9.55f, -47.55f },
132 { 4.39f, -40.45f },
133 { 75.00f, 0.00f }
134 };
135 // clipped triangle
136 const SkPoint gPoints10[] = {
137 { -10.0f, -50.0f },
138 { 10.0f, -50.0f },
139 { 50.0f, 31.0f },
140 { 40.0f, 50.0f },
141 { -40.0f, 50.0f },
142 { -50.0f, 31.0f },
143 };
144
145 const SkPoint* gPoints[] = {
146 gPoints0, gPoints1, gPoints2, gPoints3, gPoints4, gPoints5, gPoints6,
147 gPoints7, gPoints8, gPoints9, gPoints10,
148 };
149
150 const size_t gSizes[] = {
151 SK_ARRAY_COUNT(gPoints0),
152 SK_ARRAY_COUNT(gPoints1),
153 SK_ARRAY_COUNT(gPoints2),
154 SK_ARRAY_COUNT(gPoints3),
155 SK_ARRAY_COUNT(gPoints4),
156 SK_ARRAY_COUNT(gPoints5),
157 SK_ARRAY_COUNT(gPoints6),
158 SK_ARRAY_COUNT(gPoints7),
159 SK_ARRAY_COUNT(gPoints8),
160 SK_ARRAY_COUNT(gPoints9),
161 SK_ARRAY_COUNT(gPoints10),
162 };
163 static_assert(SK_ARRAY_COUNT(gSizes) == SK_ARRAY_COUNT(gPoints), "array_mismatch");
164 } // namespace ConvexLineOnlyData
165
166 namespace skiagm {
167
168 // This GM is intended to exercise Ganesh's handling of convex line-only
169 // paths
170 class ConvexLineOnlyPathsGM : public GM {
171 public:
ConvexLineOnlyPathsGM(bool doStrokeAndFill)172 ConvexLineOnlyPathsGM(bool doStrokeAndFill) : fDoStrokeAndFill(doStrokeAndFill) {
173 this->setBGColor(0xFFFFFFFF);
174 }
175
176 protected:
onShortName()177 SkString onShortName() override {
178 if (fDoStrokeAndFill) {
179 return SkString("convex-lineonly-paths-stroke-and-fill");
180 }
181 return SkString("convex-lineonly-paths");
182 }
onISize()183 SkISize onISize() override { return SkISize::Make(kGMWidth, kGMHeight); }
runAsBench() const184 bool runAsBench() const override { return true; }
185
GetPath(int index,SkPathDirection dir)186 static SkPath GetPath(int index, SkPathDirection dir) {
187 std::unique_ptr<SkPoint[]> data(nullptr);
188 const SkPoint* points;
189 int numPts;
190 if (index < (int) SK_ARRAY_COUNT(ConvexLineOnlyData::gPoints)) {
191 // manually specified
192 points = ConvexLineOnlyData::gPoints[index];
193 numPts = (int)ConvexLineOnlyData::gSizes[index];
194 } else {
195 // procedurally generated
196 SkScalar width = kMaxPathHeight/2;
197 SkScalar height = kMaxPathHeight/2;
198 switch (index-SK_ARRAY_COUNT(ConvexLineOnlyData::gPoints)) {
199 case 0:
200 numPts = 3;
201 break;
202 case 1:
203 numPts = 4;
204 break;
205 case 2:
206 numPts = 5;
207 break;
208 case 3: // squashed pentagon
209 numPts = 5;
210 width = kMaxPathHeight/5;
211 break;
212 case 4:
213 numPts = 6;
214 break;
215 case 5:
216 numPts = 8;
217 break;
218 case 6: // squashed octogon
219 numPts = 8;
220 width = kMaxPathHeight/5;
221 break;
222 case 7:
223 numPts = 20;
224 break;
225 case 8:
226 numPts = 100;
227 break;
228 default:
229 numPts = 3;
230 break;
231 }
232
233 data = std::make_unique<SkPoint[]>(numPts);
234
235 create_ngon(numPts, data.get(), width, height);
236 points = data.get();
237 }
238
239 SkPathBuilder builder;
240
241 if (SkPathDirection::kCW == dir) {
242 builder.moveTo(points[0]);
243 for (int i = 1; i < numPts; ++i) {
244 builder.lineTo(points[i]);
245 }
246 } else {
247 builder.moveTo(points[numPts-1]);
248 for (int i = numPts-2; i >= 0; --i) {
249 builder.lineTo(points[i]);
250 }
251 }
252
253 builder.close();
254 SkPath path = builder.detach();
255 #ifdef SK_DEBUG
256 // Each path this method returns should be convex, only composed of
257 // lines, wound the right direction, and short enough to fit in one
258 // of the GMs rows.
259 SkASSERT(path.isConvex());
260 SkASSERT(SkPath::kLine_SegmentMask == path.getSegmentMasks());
261 SkPathFirstDirection actualDir = SkPathPriv::ComputeFirstDirection(path);
262 SkASSERT(SkPathPriv::AsFirstDirection(dir) == actualDir);
263 SkRect bounds = path.getBounds();
264 SkASSERT(SkScalarNearlyEqual(bounds.centerX(), 0.0f));
265 SkASSERT(bounds.height() <= kMaxPathHeight);
266 #endif
267 return path;
268 }
269
270 // Draw a single path several times, shrinking it, flipping its direction
271 // and changing its start vertex each time.
drawPath(SkCanvas * canvas,int index,SkPoint * offset)272 void drawPath(SkCanvas* canvas, int index, SkPoint* offset) {
273
274 SkPoint center;
275 {
276 SkPath path = GetPath(index, SkPathDirection::kCW);
277 if (offset->fX+path.getBounds().width() > kGMWidth) {
278 offset->fX = 0;
279 offset->fY += kMaxPathHeight;
280 if (fDoStrokeAndFill) {
281 offset->fX += kStrokeWidth / 2.0f;
282 offset->fY += kStrokeWidth / 2.0f;
283 }
284 }
285 center = { offset->fX + SkScalarHalf(path.getBounds().width()), offset->fY};
286 offset->fX += path.getBounds().width();
287 if (fDoStrokeAndFill) {
288 offset->fX += kStrokeWidth;
289 }
290 }
291
292 const SkColor colors[2] = { SK_ColorBLACK, SK_ColorWHITE };
293 const SkPathDirection dirs[2] = { SkPathDirection::kCW, SkPathDirection::kCCW };
294 const float scales[] = { 1.0f, 0.75f, 0.5f, 0.25f, 0.1f, 0.01f, 0.001f };
295 const SkPaint::Join joins[3] = { SkPaint::kRound_Join,
296 SkPaint::kBevel_Join,
297 SkPaint::kMiter_Join };
298
299 SkPaint paint;
300 paint.setAntiAlias(true);
301
302 for (size_t i = 0; i < SK_ARRAY_COUNT(scales); ++i) {
303 SkPath path = GetPath(index, dirs[i%2]);
304 if (fDoStrokeAndFill) {
305 paint.setStyle(SkPaint::kStrokeAndFill_Style);
306 paint.setStrokeJoin(joins[i%3]);
307 paint.setStrokeWidth(SkIntToScalar(kStrokeWidth));
308 }
309
310 canvas->save();
311 canvas->translate(center.fX, center.fY);
312 canvas->scale(scales[i], scales[i]);
313 paint.setColor(colors[i%2]);
314 canvas->drawPath(path, paint);
315 canvas->restore();
316 }
317 }
318
onDraw(SkCanvas * canvas)319 void onDraw(SkCanvas* canvas) override {
320 // the right edge of the last drawn path
321 SkPoint offset = { 0, SkScalarHalf(kMaxPathHeight) };
322 if (fDoStrokeAndFill) {
323 offset.fX += kStrokeWidth / 2.0f;
324 offset.fY += kStrokeWidth / 2.0f;
325 }
326
327 for (int i = 0; i < kNumPaths; ++i) {
328 this->drawPath(canvas, i, &offset);
329 }
330
331 {
332 // Repro for crbug.com/472723 (Missing AA on portions of graphic with GPU rasterization)
333
334 SkPaint p;
335 p.setAntiAlias(true);
336 if (fDoStrokeAndFill) {
337 p.setStyle(SkPaint::kStrokeAndFill_Style);
338 p.setStrokeJoin(SkPaint::kMiter_Join);
339 p.setStrokeWidth(SkIntToScalar(kStrokeWidth));
340 }
341
342 SkPath p1 = SkPath::Polygon({
343 {60.8522949f, 364.671021f},
344 {59.4380493f, 364.671021f},
345 {385.414276f, 690.647217f},
346 {386.121399f, 689.940125f},
347 }, false);
348 canvas->save();
349 canvas->translate(356.0f, 50.0f);
350 canvas->drawPath(p1, p);
351 canvas->restore();
352
353 // Repro for crbug.com/869172 (SVG path incorrectly simplified when using GPU
354 // Rasterization). This will only draw anything in the stroke-and-fill version.
355 SkPath p2 = SkPath::Polygon({
356 {10.f, 0.f},
357 {38.f, 0.f},
358 {66.f, 0.f},
359 {94.f, 0.f},
360 {122.f, 0.f},
361 {150.f, 0.f},
362 {150.f, 0.f},
363 {122.f, 0.f},
364 {94.f, 0.f},
365 {66.f, 0.f},
366 {38.f, 0.f},
367 {10.f, 0.f},
368 }, true);
369 canvas->save();
370 canvas->translate(0.0f, 500.0f);
371 canvas->drawPath(p2, p);
372 canvas->restore();
373
374 // Repro for crbug.com/856137. This path previously caused GrAAConvexTessellator to turn
375 // inset rings into outsets when adjacent bisector angles converged outside the previous
376 // ring due to accumulated error.
377 SkPath p3 = SkPath::Polygon({
378 {1184.96f, 982.557f},
379 {1183.71f, 982.865f},
380 {1180.99f, 982.734f},
381 {1178.5f, 981.541f},
382 {1176.35f, 979.367f},
383 {1178.94f, 938.854f},
384 {1181.35f, 936.038f},
385 {1183.96f, 934.117f},
386 {1186.67f, 933.195f},
387 {1189.36f, 933.342f},
388 {1191.58f, 934.38f},
389 }, true, SkPathFillType::kEvenOdd);
390 canvas->save();
391 SkMatrix m;
392 m.setAll(0.0893210843f, 0, 79.1197586f, 0, 0.0893210843f, 300, 0, 0, 1);
393 canvas->concat(m);
394 canvas->drawPath(p3, p);
395 canvas->restore();
396 }
397 }
398
399 private:
400 inline static constexpr int kStrokeWidth = 10;
401 inline static constexpr int kNumPaths = 20;
402 inline static constexpr int kMaxPathHeight = 100;
403 inline static constexpr int kGMWidth = 512;
404 inline static constexpr int kGMHeight = 512;
405
406 bool fDoStrokeAndFill;
407
408 using INHERITED = GM;
409 };
410
411 //////////////////////////////////////////////////////////////////////////////
412
413 DEF_GM(return new ConvexLineOnlyPathsGM(false);)
414 DEF_GM(return new ConvexLineOnlyPathsGM(true);)
415 } // namespace skiagm
416