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 "SkColor.h"
11 #include "SkDashPathEffect.h"
12 #include "SkImageInfo.h"
13 #include "SkMatrix.h"
14 #include "SkPaint.h"
15 #include "SkPath.h"
16 #include "SkPathEffect.h"
17 #include "SkPoint.h"
18 #include "SkRRect.h"
19 #include "SkRect.h"
20 #include "SkRefCnt.h"
21 #include "SkScalar.h"
22 #include "SkStrokeRec.h"
23 #include "SkSurface.h"
24 #include "SkTypes.h"
25 #include "Test.h"
26
27 // test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint)
test_big_aa_rect(skiatest::Reporter * reporter)28 static void test_big_aa_rect(skiatest::Reporter* reporter) {
29 SkBitmap output;
30 SkPMColor pixel[1];
31 output.installPixels(SkImageInfo::MakeN32Premul(1, 1), pixel, 4);
32
33 auto surf = SkSurface::MakeRasterN32Premul(300, 33300);
34 SkCanvas* canvas = surf->getCanvas();
35
36 SkRect r = { 0, 33000, 300, 33300 };
37 int x = SkScalarRoundToInt(r.left());
38 int y = SkScalarRoundToInt(r.top());
39
40 // check that the pixel in question starts as transparent (by the surface)
41 if (surf->readPixels(output, x, y)) {
42 REPORTER_ASSERT(reporter, 0 == pixel[0]);
43 } else {
44 REPORTER_ASSERT(reporter, false, "readPixels failed");
45 }
46
47 SkPaint paint;
48 paint.setAntiAlias(true);
49 paint.setColor(SK_ColorWHITE);
50
51 canvas->drawRect(r, paint);
52
53 // Now check that it is BLACK
54 if (surf->readPixels(output, x, y)) {
55 // don't know what swizzling PMColor did, but white should always
56 // appear the same.
57 REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]);
58 } else {
59 REPORTER_ASSERT(reporter, false, "readPixels failed");
60 }
61 }
62
63 ///////////////////////////////////////////////////////////////////////////////
64
moveToH(SkPath * path,const uint32_t raw[])65 static void moveToH(SkPath* path, const uint32_t raw[]) {
66 const float* fptr = (const float*)raw;
67 path->moveTo(fptr[0], fptr[1]);
68 }
69
cubicToH(SkPath * path,const uint32_t raw[])70 static void cubicToH(SkPath* path, const uint32_t raw[]) {
71 const float* fptr = (const float*)raw;
72 path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
73 }
74
75 // This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
76 // arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
77 // was that the initial line-segment produced by the cubic was not monotonically
78 // going down (i.e. the initial DY was negative). By rounding the floats, we get
79 // the more proper result.
80 //
81 // http://code.google.com/p/chromium/issues/detail?id=131181
82 //
83
84 // we're not calling this test anymore; is that for a reason?
85
test_crbug131181()86 static void test_crbug131181() {
87 /*
88 fX = 18.8943768,
89 fY = 129.121277
90 }, {
91 fX = 18.8937435,
92 fY = 129.121689
93 }, {
94 fX = 18.8950119,
95 fY = 129.120422
96 }, {
97 fX = 18.5030727,
98 fY = 129.13121
99 */
100 uint32_t data[] = {
101 0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
102 0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
103 };
104
105 SkPath path;
106 moveToH(&path, &data[0]);
107 cubicToH(&path, &data[2]);
108
109 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
110
111 SkPaint paint;
112 paint.setAntiAlias(true);
113 surface->getCanvas()->drawPath(path, paint);
114 }
115
116 // This used to assert in debug builds (and crash writing bad memory in release)
117 // because we overflowed an intermediate value (B coefficient) setting up our
118 // stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
test_crbug_140803()119 static void test_crbug_140803() {
120 SkBitmap bm;
121 bm.allocN32Pixels(2700, 30*1024);
122 SkCanvas canvas(bm);
123
124 SkPaint paint;
125 paint.setAntiAlias(true);
126 canvas.drawPath(SkPath().moveTo(2762, 20).quadTo(11, 21702, 10, 21706), paint);
127 }
128
129 // Need to exercise drawing an inverse-path whose bounds intersect the clip,
130 // but whose edges do not (since its a quad which draws only in the bottom half
131 // of its bounds).
132 // In the debug build, we used to assert in this case, until it was fixed.
133 //
test_inversepathwithclip()134 static void test_inversepathwithclip() {
135 SkPath path;
136
137 path.moveTo(0, 20);
138 path.quadTo(10, 10, 20, 20);
139 path.toggleInverseFillType();
140
141 SkPaint paint;
142
143 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
144 SkCanvas* canvas = surface->getCanvas();
145 canvas->save();
146 canvas->clipRect(SkRect::MakeWH(19, 11));
147
148 paint.setAntiAlias(false);
149 canvas->drawPath(path, paint);
150 paint.setAntiAlias(true);
151 canvas->drawPath(path, paint);
152
153 canvas->restore();
154
155 // Now do the test again, with the path flipped, so we only draw in the
156 // top half of our bounds, and have the clip intersect our bounds at the
157 // bottom.
158 path.reset(); // preserves our filltype
159 path.moveTo(0, 10);
160 path.quadTo(10, 20, 20, 10);
161 canvas->clipRect(SkRect::MakeXYWH(0, 19, 19, 11));
162
163 paint.setAntiAlias(false);
164 canvas->drawPath(path, paint);
165 paint.setAntiAlias(true);
166 canvas->drawPath(path, paint);
167 }
168
test_bug533()169 static void test_bug533() {
170 /*
171 http://code.google.com/p/skia/issues/detail?id=533
172 This particular test/bug only applies to the float case, where the
173 coordinates are very large.
174 */
175 SkPath path;
176 path.moveTo(64, 3);
177 path.quadTo(-329936, -100000000, 1153, 330003);
178
179 SkPaint paint;
180 paint.setAntiAlias(true);
181
182 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
183 surface->getCanvas()->drawPath(path, paint);
184 }
185
test_crbug_140642()186 static void test_crbug_140642() {
187 /*
188 * We used to see this construct, and due to rounding as we accumulated
189 * our length, the loop where we apply the phase would run off the end of
190 * the array, since it relied on just -= each interval value, which did not
191 * behave as "expected". Now the code explicitly checks for walking off the
192 * end of that array.
193
194 * A different (better) fix might be to rewrite dashing to do all of its
195 * length/phase/measure math using double, but this may need to be
196 * coordinated with SkPathMeasure, to be consistent between the two.
197
198 <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
199 stroke-dashoffset="-248.135982067">
200 */
201
202 const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
203 auto dontAssert = SkDashPathEffect::Make(vals, 4, -248.135982067f);
204 }
205
test_crbug_124652()206 static void test_crbug_124652() {
207 /*
208 http://code.google.com/p/chromium/issues/detail?id=124652
209 This particular test/bug only applies to the float case, where
210 large values can "swamp" small ones.
211 */
212 SkScalar intervals[2] = {837099584, 33450};
213 auto dontAssert = SkDashPathEffect::Make(intervals, 2, -10);
214 }
215
test_bigcubic()216 static void test_bigcubic() {
217 SkPath path;
218 path.moveTo(64, 3);
219 path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
220
221 SkPaint paint;
222 paint.setAntiAlias(true);
223
224 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
225 surface->getCanvas()->drawPath(path, paint);
226 }
227
228 // asserts if halfway case is not handled
test_halfway()229 static void test_halfway() {
230 SkPaint paint;
231 SkPath path;
232 path.moveTo(16365.5f, 1394);
233 path.lineTo(16365.5f, 1387.5f);
234 path.quadTo(16365.5f, 1385.43f, 16367, 1383.96f);
235 path.quadTo(16368.4f, 1382.5f, 16370.5f, 1382.5f);
236 path.lineTo(16465.5f, 1382.5f);
237 path.quadTo(16467.6f, 1382.5f, 16469, 1383.96f);
238 path.quadTo(16470.5f, 1385.43f, 16470.5f, 1387.5f);
239 path.lineTo(16470.5f, 1394);
240 path.quadTo(16470.5f, 1396.07f, 16469, 1397.54f);
241 path.quadTo(16467.6f, 1399, 16465.5f, 1399);
242 path.lineTo(16370.5f, 1399);
243 path.quadTo(16368.4f, 1399, 16367, 1397.54f);
244 path.quadTo(16365.5f, 1396.07f, 16365.5f, 1394);
245 path.close();
246 SkPath p2;
247 SkMatrix m;
248 m.reset();
249 m.postTranslate(0.001f, 0.001f);
250 path.transform(m, &p2);
251
252 auto surface(SkSurface::MakeRasterN32Premul(640, 480));
253 SkCanvas* canvas = surface->getCanvas();
254 canvas->translate(-16366, -1383);
255 canvas->drawPath(p2, paint);
256
257 m.reset();
258 m.postTranslate(-0.001f, -0.001f);
259 path.transform(m, &p2);
260 canvas->drawPath(p2, paint);
261
262 m.reset();
263 path.transform(m, &p2);
264 canvas->drawPath(p2, paint);
265 }
266
267 // we used to assert if the bounds of the device (clip) was larger than 32K
268 // even when the path itself was smaller. We just draw and hope in the debug
269 // version to not assert.
test_giantaa()270 static void test_giantaa() {
271 const int W = 400;
272 const int H = 400;
273 auto surface(SkSurface::MakeRasterN32Premul(33000, 10));
274
275 SkPaint paint;
276 paint.setAntiAlias(true);
277 SkPath path;
278 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
279 surface->getCanvas()->drawPath(path, paint);
280 }
281
282 // Extremely large path_length/dash_length ratios may cause infinite looping
283 // in SkDashPathEffect::filterPath() due to single precision rounding.
284 // The test is quite expensive, but it should get much faster after the fix
285 // for http://crbug.com/165432 goes in.
test_infinite_dash(skiatest::Reporter * reporter)286 static void test_infinite_dash(skiatest::Reporter* reporter) {
287 SkPath path;
288 path.moveTo(0, 0);
289 path.lineTo(5000000, 0);
290
291 SkScalar intervals[] = { 0.2f, 0.2f };
292 sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
293
294 SkPath filteredPath;
295 SkPaint paint;
296 paint.setStyle(SkPaint::kStroke_Style);
297 paint.setPathEffect(dash);
298
299 paint.getFillPath(path, &filteredPath);
300 // If we reach this, we passed.
301 REPORTER_ASSERT(reporter, true);
302 }
303
304 // http://crbug.com/165432
305 // Limit extreme dash path effects to avoid exhausting the system memory.
test_crbug_165432(skiatest::Reporter * reporter)306 static void test_crbug_165432(skiatest::Reporter* reporter) {
307 SkPath path;
308 path.moveTo(0, 0);
309 path.lineTo(10000000, 0);
310
311 SkScalar intervals[] = { 0.5f, 0.5f };
312 sk_sp<SkPathEffect> dash(SkDashPathEffect::Make(intervals, 2, 0));
313
314 SkPaint paint;
315 paint.setStyle(SkPaint::kStroke_Style);
316 paint.setPathEffect(dash);
317
318 SkPath filteredPath;
319 SkStrokeRec rec(paint);
320 REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, nullptr));
321 REPORTER_ASSERT(reporter, filteredPath.isEmpty());
322 }
323
324 // http://crbug.com/472147
325 // This is a simplified version from the bug. RRect radii not properly scaled.
test_crbug_472147_simple(skiatest::Reporter * reporter)326 static void test_crbug_472147_simple(skiatest::Reporter* reporter) {
327 auto surface(SkSurface::MakeRasterN32Premul(1000, 1000));
328 SkCanvas* canvas = surface->getCanvas();
329 SkPaint p;
330 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
331 SkVector radii[4] = {
332 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
333 };
334 SkRRect rr;
335 rr.setRectRadii(r, radii);
336 canvas->drawRRect(rr, p);
337 }
338
339 // http://crbug.com/472147
340 // RRect radii not properly scaled.
test_crbug_472147_actual(skiatest::Reporter * reporter)341 static void test_crbug_472147_actual(skiatest::Reporter* reporter) {
342 auto surface(SkSurface::MakeRasterN32Premul(1000, 1000));
343 SkCanvas* canvas = surface->getCanvas();
344 SkPaint p;
345 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
346 SkVector radii[4] = {
347 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
348 };
349 SkRRect rr;
350 rr.setRectRadii(r, radii);
351 canvas->clipRRect(rr);
352
353 SkRect r2 = SkRect::MakeLTRB(0, 33, 1102, 33554464);
354 canvas->drawRect(r2, p);
355 }
356
DEF_TEST(DrawPath,reporter)357 DEF_TEST(DrawPath, reporter) {
358 test_giantaa();
359 test_bug533();
360 test_bigcubic();
361 test_crbug_124652();
362 test_crbug_140642();
363 test_crbug_140803();
364 test_inversepathwithclip();
365 // why?
366 if (false) test_crbug131181();
367 test_infinite_dash(reporter);
368 test_crbug_165432(reporter);
369 test_crbug_472147_simple(reporter);
370 test_crbug_472147_actual(reporter);
371 test_big_aa_rect(reporter);
372 test_halfway();
373 }
374