1 /*
2 * Copyright 2012 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 "SkBitmap.h"
9 #include "SkCanvas.h"
10 #include "SkDashPathEffect.h"
11 #include "SkStrokeRec.h"
12 #include "SkSurface.h"
13 #include "Test.h"
14
15 // test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint)
test_big_aa_rect(skiatest::Reporter * reporter)16 static void test_big_aa_rect(skiatest::Reporter* reporter) {
17 SkBitmap output;
18 SkPMColor pixel[1];
19 output.installPixels(SkImageInfo::MakeN32Premul(1, 1), pixel, 4);
20
21 auto surf = SkSurface::MakeRasterN32Premul(300, 33300);
22 SkCanvas* canvas = surf->getCanvas();
23
24 SkRect r = { 0, 33000, 300, 33300 };
25 int x = SkScalarRoundToInt(r.left());
26 int y = SkScalarRoundToInt(r.top());
27
28 // check that the pixel in question starts as transparent (by the surface)
29 if (surf->readPixels(output, x, y)) {
30 REPORTER_ASSERT(reporter, 0 == pixel[0]);
31 } else {
32 REPORTER_ASSERT(reporter, false, "readPixels failed");
33 }
34
35 SkPaint paint;
36 paint.setAntiAlias(true);
37 paint.setColor(SK_ColorWHITE);
38
39 canvas->drawRect(r, paint);
40
41 // Now check that it is BLACK
42 if (surf->readPixels(output, x, y)) {
43 // don't know what swizzling PMColor did, but white should always
44 // appear the same.
45 REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]);
46 } else {
47 REPORTER_ASSERT(reporter, false, "readPixels failed");
48 }
49 }
50
51 ///////////////////////////////////////////////////////////////////////////////
52
moveToH(SkPath * path,const uint32_t raw[])53 static void moveToH(SkPath* path, const uint32_t raw[]) {
54 const float* fptr = (const float*)raw;
55 path->moveTo(fptr[0], fptr[1]);
56 }
57
cubicToH(SkPath * path,const uint32_t raw[])58 static void cubicToH(SkPath* path, const uint32_t raw[]) {
59 const float* fptr = (const float*)raw;
60 path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
61 }
62
63 // This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
64 // arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
65 // was that the initial line-segment produced by the cubic was not monotonically
66 // going down (i.e. the initial DY was negative). By rounding the floats, we get
67 // the more proper result.
68 //
69 // http://code.google.com/p/chromium/issues/detail?id=131181
70 //
71
72 // we're not calling this test anymore; is that for a reason?
73
test_crbug131181()74 static void test_crbug131181() {
75 /*
76 fX = 18.8943768,
77 fY = 129.121277
78 }, {
79 fX = 18.8937435,
80 fY = 129.121689
81 }, {
82 fX = 18.8950119,
83 fY = 129.120422
84 }, {
85 fX = 18.5030727,
86 fY = 129.13121
87 */
88 uint32_t data[] = {
89 0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
90 0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
91 };
92
93 SkPath path;
94 moveToH(&path, &data[0]);
95 cubicToH(&path, &data[2]);
96
97 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
98
99 SkPaint paint;
100 paint.setAntiAlias(true);
101 surface->getCanvas()->drawPath(path, paint);
102 }
103
104 // This used to assert in debug builds (and crash writing bad memory in release)
105 // because we overflowed an intermediate value (B coefficient) setting up our
106 // stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
test_crbug_140803()107 static void test_crbug_140803() {
108 SkBitmap bm;
109 bm.allocN32Pixels(2700, 30*1024);
110 SkCanvas canvas(bm);
111
112 SkPath path;
113 path.moveTo(2762, 20);
114 path.quadTo(11, 21702, 10, 21706);
115 SkPaint paint;
116 paint.setAntiAlias(true);
117 canvas.drawPath(path, paint);
118 }
119
120 // Need to exercise drawing an inverse-path whose bounds intersect the clip,
121 // but whose edges do not (since its a quad which draws only in the bottom half
122 // of its bounds).
123 // In the debug build, we used to assert in this case, until it was fixed.
124 //
test_inversepathwithclip()125 static void test_inversepathwithclip() {
126 SkPath path;
127
128 path.moveTo(0, 20);
129 path.quadTo(10, 10, 20, 20);
130 path.toggleInverseFillType();
131
132 SkPaint paint;
133
134 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
135 SkCanvas* canvas = surface->getCanvas();
136 canvas->save();
137 canvas->clipRect(SkRect::MakeWH(19, 11));
138
139 paint.setAntiAlias(false);
140 canvas->drawPath(path, paint);
141 paint.setAntiAlias(true);
142 canvas->drawPath(path, paint);
143
144 canvas->restore();
145
146 // Now do the test again, with the path flipped, so we only draw in the
147 // top half of our bounds, and have the clip intersect our bounds at the
148 // bottom.
149 path.reset(); // preserves our filltype
150 path.moveTo(0, 10);
151 path.quadTo(10, 20, 20, 10);
152 canvas->clipRect(SkRect::MakeXYWH(0, 19, 19, 11));
153
154 paint.setAntiAlias(false);
155 canvas->drawPath(path, paint);
156 paint.setAntiAlias(true);
157 canvas->drawPath(path, paint);
158 }
159
test_bug533()160 static void test_bug533() {
161 /*
162 http://code.google.com/p/skia/issues/detail?id=533
163 This particular test/bug only applies to the float case, where the
164 coordinates are very large.
165 */
166 SkPath path;
167 path.moveTo(64, 3);
168 path.quadTo(-329936, -100000000, 1153, 330003);
169
170 SkPaint paint;
171 paint.setAntiAlias(true);
172
173 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
174 surface->getCanvas()->drawPath(path, paint);
175 }
176
test_crbug_140642()177 static void test_crbug_140642() {
178 /*
179 * We used to see this construct, and due to rounding as we accumulated
180 * our length, the loop where we apply the phase would run off the end of
181 * the array, since it relied on just -= each interval value, which did not
182 * behave as "expected". Now the code explicitly checks for walking off the
183 * end of that array.
184
185 * A different (better) fix might be to rewrite dashing to do all of its
186 * length/phase/measure math using double, but this may need to be
187 * coordinated with SkPathMeasure, to be consistent between the two.
188
189 <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
190 stroke-dashoffset="-248.135982067">
191 */
192
193 const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
194 auto dontAssert = SkDashPathEffect::Make(vals, 4, -248.135982067f);
195 }
196
test_crbug_124652()197 static void test_crbug_124652() {
198 /*
199 http://code.google.com/p/chromium/issues/detail?id=124652
200 This particular test/bug only applies to the float case, where
201 large values can "swamp" small ones.
202 */
203 SkScalar intervals[2] = {837099584, 33450};
204 auto dontAssert = SkDashPathEffect::Make(intervals, 2, -10);
205 }
206
test_bigcubic()207 static void test_bigcubic() {
208 SkPath path;
209 path.moveTo(64, 3);
210 path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
211
212 SkPaint paint;
213 paint.setAntiAlias(true);
214
215 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
216 surface->getCanvas()->drawPath(path, paint);
217 }
218
219 // asserts if halfway case is not handled
test_halfway()220 static void test_halfway() {
221 SkPaint paint;
222 SkPath path;
223 path.moveTo(16365.5f, 1394);
224 path.lineTo(16365.5f, 1387.5f);
225 path.quadTo(16365.5f, 1385.43f, 16367, 1383.96f);
226 path.quadTo(16368.4f, 1382.5f, 16370.5f, 1382.5f);
227 path.lineTo(16465.5f, 1382.5f);
228 path.quadTo(16467.6f, 1382.5f, 16469, 1383.96f);
229 path.quadTo(16470.5f, 1385.43f, 16470.5f, 1387.5f);
230 path.lineTo(16470.5f, 1394);
231 path.quadTo(16470.5f, 1396.07f, 16469, 1397.54f);
232 path.quadTo(16467.6f, 1399, 16465.5f, 1399);
233 path.lineTo(16370.5f, 1399);
234 path.quadTo(16368.4f, 1399, 16367, 1397.54f);
235 path.quadTo(16365.5f, 1396.07f, 16365.5f, 1394);
236 path.close();
237 SkPath p2;
238 SkMatrix m;
239 m.reset();
240 m.postTranslate(0.001f, 0.001f);
241 path.transform(m, &p2);
242
243 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
244 SkCanvas* canvas = surface->getCanvas();
245 canvas->translate(-16366, -1383);
246 canvas->drawPath(p2, paint);
247
248 m.reset();
249 m.postTranslate(-0.001f, -0.001f);
250 path.transform(m, &p2);
251 canvas->drawPath(p2, paint);
252
253 m.reset();
254 path.transform(m, &p2);
255 canvas->drawPath(p2, paint);
256 }
257
258 // we used to assert if the bounds of the device (clip) was larger than 32K
259 // even when the path itself was smaller. We just draw and hope in the debug
260 // version to not assert.
test_giantaa()261 static void test_giantaa() {
262 const int W = 400;
263 const int H = 400;
264 auto surface(SkSurface::MakeRasterN32Premul(33000, 10));
265
266 SkPaint paint;
267 paint.setAntiAlias(true);
268 SkPath path;
269 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
270 surface->getCanvas()->drawPath(path, paint);
271 }
272
273 // Extremely large path_length/dash_length ratios may cause infinite looping
274 // in SkDashPathEffect::filterPath() due to single precision rounding.
275 // The test is quite expensive, but it should get much faster after the fix
276 // for http://crbug.com/165432 goes in.
test_infinite_dash(skiatest::Reporter * reporter)277 static void test_infinite_dash(skiatest::Reporter* reporter) {
278 SkPath path;
279 path.moveTo(0, 0);
280 path.lineTo(5000000, 0);
281
282 SkScalar intervals[] = { 0.2f, 0.2f };
283 sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
284
285 SkPath filteredPath;
286 SkPaint paint;
287 paint.setStyle(SkPaint::kStroke_Style);
288 paint.setPathEffect(dash);
289
290 paint.getFillPath(path, &filteredPath);
291 // If we reach this, we passed.
292 REPORTER_ASSERT(reporter, true);
293 }
294
295 // http://crbug.com/165432
296 // Limit extreme dash path effects to avoid exhausting the system memory.
test_crbug_165432(skiatest::Reporter * reporter)297 static void test_crbug_165432(skiatest::Reporter* reporter) {
298 SkPath path;
299 path.moveTo(0, 0);
300 path.lineTo(10000000, 0);
301
302 SkScalar intervals[] = { 0.5f, 0.5f };
303 sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
304
305 SkPaint paint;
306 paint.setStyle(SkPaint::kStroke_Style);
307 paint.setPathEffect(dash);
308
309 SkPath filteredPath;
310 SkStrokeRec rec(paint);
311 REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, nullptr));
312 REPORTER_ASSERT(reporter, filteredPath.isEmpty());
313 }
314
315 // http://crbug.com/472147
316 // This is a simplified version from the bug. RRect radii not properly scaled.
test_crbug_472147_simple(skiatest::Reporter * reporter)317 static void test_crbug_472147_simple(skiatest::Reporter* reporter) {
318 auto surface(SkSurface::MakeRasterN32Premul(1000, 1000));
319 SkCanvas* canvas = surface->getCanvas();
320 SkPaint p;
321 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
322 SkVector radii[4] = {
323 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
324 };
325 SkRRect rr;
326 rr.setRectRadii(r, radii);
327 canvas->drawRRect(rr, p);
328 }
329
330 // http://crbug.com/472147
331 // RRect radii not properly scaled.
test_crbug_472147_actual(skiatest::Reporter * reporter)332 static void test_crbug_472147_actual(skiatest::Reporter* reporter) {
333 auto surface(SkSurface::MakeRasterN32Premul(1000, 1000));
334 SkCanvas* canvas = surface->getCanvas();
335 SkPaint p;
336 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
337 SkVector radii[4] = {
338 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
339 };
340 SkRRect rr;
341 rr.setRectRadii(r, radii);
342 canvas->clipRRect(rr);
343
344 SkRect r2 = SkRect::MakeLTRB(0, 33, 1102, 33554464);
345 canvas->drawRect(r2, p);
346 }
347
DEF_TEST(DrawPath,reporter)348 DEF_TEST(DrawPath, reporter) {
349 test_giantaa();
350 test_bug533();
351 test_bigcubic();
352 test_crbug_124652();
353 test_crbug_140642();
354 test_crbug_140803();
355 test_inversepathwithclip();
356 // why?
357 if (false) test_crbug131181();
358 test_infinite_dash(reporter);
359 test_crbug_165432(reporter);
360 test_crbug_472147_simple(reporter);
361 test_crbug_472147_actual(reporter);
362 test_big_aa_rect(reporter);
363 test_halfway();
364 }
365