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 SkSurface* surf = SkSurface::NewRasterN32Premul(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 (canvas->readPixels(&output, x, y)) {
30 REPORTER_ASSERT(reporter, 0 == pixel[0]);
31 } else {
32 REPORTER_ASSERT_MESSAGE(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 (canvas->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_MESSAGE(reporter, false, "readPixels failed");
48 }
49 surf->unref();
50 }
51
52 ///////////////////////////////////////////////////////////////////////////////
53
moveToH(SkPath * path,const uint32_t raw[])54 static void moveToH(SkPath* path, const uint32_t raw[]) {
55 const float* fptr = (const float*)raw;
56 path->moveTo(fptr[0], fptr[1]);
57 }
58
cubicToH(SkPath * path,const uint32_t raw[])59 static void cubicToH(SkPath* path, const uint32_t raw[]) {
60 const float* fptr = (const float*)raw;
61 path->cubicTo(fptr[0], fptr[1], fptr[2], fptr[3], fptr[4], fptr[5]);
62 }
63
64 // This used to assert, because we performed a cast (int)(pt[0].fX * scale) to
65 // arrive at an int (SkFDot6) rather than calling sk_float_round2int. The assert
66 // was that the initial line-segment produced by the cubic was not monotonically
67 // going down (i.e. the initial DY was negative). By rounding the floats, we get
68 // the more proper result.
69 //
70 // http://code.google.com/p/chromium/issues/detail?id=131181
71 //
72
73 // we're not calling this test anymore; is that for a reason?
74
test_crbug131181()75 static void test_crbug131181() {
76 /*
77 fX = 18.8943768,
78 fY = 129.121277
79 }, {
80 fX = 18.8937435,
81 fY = 129.121689
82 }, {
83 fX = 18.8950119,
84 fY = 129.120422
85 }, {
86 fX = 18.5030727,
87 fY = 129.13121
88 */
89 uint32_t data[] = {
90 0x419727af, 0x43011f0c, 0x41972663, 0x43011f27,
91 0x419728fc, 0x43011ed4, 0x4194064b, 0x43012197
92 };
93
94 SkPath path;
95 moveToH(&path, &data[0]);
96 cubicToH(&path, &data[2]);
97
98 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
99
100 SkPaint paint;
101 paint.setAntiAlias(true);
102 surface->getCanvas()->drawPath(path, paint);
103 }
104
105 // This used to assert in debug builds (and crash writing bad memory in release)
106 // because we overflowed an intermediate value (B coefficient) setting up our
107 // stepper for the quadratic. Now we bias that value by 1/2 so we don't overflow
test_crbug_140803()108 static void test_crbug_140803() {
109 SkBitmap bm;
110 bm.allocN32Pixels(2700, 30*1024);
111 SkCanvas canvas(bm);
112
113 SkPath path;
114 path.moveTo(2762, 20);
115 path.quadTo(11, 21702, 10, 21706);
116 SkPaint paint;
117 paint.setAntiAlias(true);
118 canvas.drawPath(path, paint);
119 }
120
121 // Need to exercise drawing an inverse-path whose bounds intersect the clip,
122 // but whose edges do not (since its a quad which draws only in the bottom half
123 // of its bounds).
124 // In the debug build, we used to assert in this case, until it was fixed.
125 //
test_inversepathwithclip()126 static void test_inversepathwithclip() {
127 SkPath path;
128
129 path.moveTo(0, 20);
130 path.quadTo(10, 10, 20, 20);
131 path.toggleInverseFillType();
132
133 SkPaint paint;
134
135 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
136 SkCanvas* canvas = surface->getCanvas();
137 canvas->save();
138 canvas->clipRect(SkRect::MakeWH(19, 11));
139
140 paint.setAntiAlias(false);
141 canvas->drawPath(path, paint);
142 paint.setAntiAlias(true);
143 canvas->drawPath(path, paint);
144
145 canvas->restore();
146
147 // Now do the test again, with the path flipped, so we only draw in the
148 // top half of our bounds, and have the clip intersect our bounds at the
149 // bottom.
150 path.reset(); // preserves our filltype
151 path.moveTo(0, 10);
152 path.quadTo(10, 20, 20, 10);
153 canvas->clipRect(SkRect::MakeXYWH(0, 19, 19, 11));
154
155 paint.setAntiAlias(false);
156 canvas->drawPath(path, paint);
157 paint.setAntiAlias(true);
158 canvas->drawPath(path, paint);
159 }
160
test_bug533()161 static void test_bug533() {
162 /*
163 http://code.google.com/p/skia/issues/detail?id=533
164 This particular test/bug only applies to the float case, where the
165 coordinates are very large.
166 */
167 SkPath path;
168 path.moveTo(64, 3);
169 path.quadTo(-329936, -100000000, 1153, 330003);
170
171 SkPaint paint;
172 paint.setAntiAlias(true);
173
174 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
175 surface->getCanvas()->drawPath(path, paint);
176 }
177
test_crbug_140642()178 static void test_crbug_140642() {
179 /*
180 * We used to see this construct, and due to rounding as we accumulated
181 * our length, the loop where we apply the phase would run off the end of
182 * the array, since it relied on just -= each interval value, which did not
183 * behave as "expected". Now the code explicitly checks for walking off the
184 * end of that array.
185
186 * A different (better) fix might be to rewrite dashing to do all of its
187 * length/phase/measure math using double, but this may need to be
188 * coordinated with SkPathMeasure, to be consistent between the two.
189
190 <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247"
191 stroke-dashoffset="-248.135982067">
192 */
193
194 const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 };
195 SkAutoTUnref<SkPathEffect> dontAssert(SkDashPathEffect::Create(vals, 4, -248.135982067f));
196 }
197
test_crbug_124652()198 static void test_crbug_124652() {
199 /*
200 http://code.google.com/p/chromium/issues/detail?id=124652
201 This particular test/bug only applies to the float case, where
202 large values can "swamp" small ones.
203 */
204 SkScalar intervals[2] = {837099584, 33450};
205 SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, 2, -10));
206 }
207
test_bigcubic()208 static void test_bigcubic() {
209 SkPath path;
210 path.moveTo(64, 3);
211 path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003);
212
213 SkPaint paint;
214 paint.setAntiAlias(true);
215
216 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
217 surface->getCanvas()->drawPath(path, paint);
218 }
219
220 // asserts if halfway case is not handled
test_halfway()221 static void test_halfway() {
222 SkPaint paint;
223 SkPath path;
224 path.moveTo(16365.5f, 1394);
225 path.lineTo(16365.5f, 1387.5f);
226 path.quadTo(16365.5f, 1385.43f, 16367, 1383.96f);
227 path.quadTo(16368.4f, 1382.5f, 16370.5f, 1382.5f);
228 path.lineTo(16465.5f, 1382.5f);
229 path.quadTo(16467.6f, 1382.5f, 16469, 1383.96f);
230 path.quadTo(16470.5f, 1385.43f, 16470.5f, 1387.5f);
231 path.lineTo(16470.5f, 1394);
232 path.quadTo(16470.5f, 1396.07f, 16469, 1397.54f);
233 path.quadTo(16467.6f, 1399, 16465.5f, 1399);
234 path.lineTo(16370.5f, 1399);
235 path.quadTo(16368.4f, 1399, 16367, 1397.54f);
236 path.quadTo(16365.5f, 1396.07f, 16365.5f, 1394);
237 path.close();
238 SkPath p2;
239 SkMatrix m;
240 m.reset();
241 m.postTranslate(0.001f, 0.001f);
242 path.transform(m, &p2);
243
244 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480));
245 SkCanvas* canvas = surface->getCanvas();
246 canvas->translate(-16366, -1383);
247 canvas->drawPath(p2, paint);
248
249 m.reset();
250 m.postTranslate(-0.001f, -0.001f);
251 path.transform(m, &p2);
252 canvas->drawPath(p2, paint);
253
254 m.reset();
255 path.transform(m, &p2);
256 canvas->drawPath(p2, paint);
257 }
258
259 // we used to assert if the bounds of the device (clip) was larger than 32K
260 // even when the path itself was smaller. We just draw and hope in the debug
261 // version to not assert.
test_giantaa()262 static void test_giantaa() {
263 const int W = 400;
264 const int H = 400;
265 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(33000, 10));
266
267 SkPaint paint;
268 paint.setAntiAlias(true);
269 SkPath path;
270 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H));
271 surface->getCanvas()->drawPath(path, paint);
272 }
273
274 // Extremely large path_length/dash_length ratios may cause infinite looping
275 // in SkDashPathEffect::filterPath() due to single precision rounding.
276 // The test is quite expensive, but it should get much faster after the fix
277 // for http://crbug.com/165432 goes in.
test_infinite_dash(skiatest::Reporter * reporter)278 static void test_infinite_dash(skiatest::Reporter* reporter) {
279 SkPath path;
280 path.moveTo(0, 0);
281 path.lineTo(5000000, 0);
282
283 SkScalar intervals[] = { 0.2f, 0.2f };
284 SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
285
286 SkPath filteredPath;
287 SkPaint paint;
288 paint.setStyle(SkPaint::kStroke_Style);
289 paint.setPathEffect(dash);
290
291 paint.getFillPath(path, &filteredPath);
292 // If we reach this, we passed.
293 REPORTER_ASSERT(reporter, true);
294 }
295
296 // http://crbug.com/165432
297 // Limit extreme dash path effects to avoid exhausting the system memory.
test_crbug_165432(skiatest::Reporter * reporter)298 static void test_crbug_165432(skiatest::Reporter* reporter) {
299 SkPath path;
300 path.moveTo(0, 0);
301 path.lineTo(10000000, 0);
302
303 SkScalar intervals[] = { 0.5f, 0.5f };
304 SkAutoTUnref<SkPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0));
305
306 SkPaint paint;
307 paint.setStyle(SkPaint::kStroke_Style);
308 paint.setPathEffect(dash);
309
310 SkPath filteredPath;
311 SkStrokeRec rec(paint);
312 REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, nullptr));
313 REPORTER_ASSERT(reporter, filteredPath.isEmpty());
314 }
315
316 // http://crbug.com/472147
317 // This is a simplified version from the bug. RRect radii not properly scaled.
test_crbug_472147_simple(skiatest::Reporter * reporter)318 static void test_crbug_472147_simple(skiatest::Reporter* reporter) {
319 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(1000, 1000));
320 SkCanvas* canvas = surface->getCanvas();
321 SkPaint p;
322 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
323 SkVector radii[4] = {
324 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
325 };
326 SkRRect rr;
327 rr.setRectRadii(r, radii);
328 canvas->drawRRect(rr, p);
329 }
330
331 // http://crbug.com/472147
332 // RRect radii not properly scaled.
test_crbug_472147_actual(skiatest::Reporter * reporter)333 static void test_crbug_472147_actual(skiatest::Reporter* reporter) {
334 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(1000, 1000));
335 SkCanvas* canvas = surface->getCanvas();
336 SkPaint p;
337 SkRect r = SkRect::MakeLTRB(-246.0f, 33.0f, 848.0f, 33554464.0f);
338 SkVector radii[4] = {
339 { 13.0f, 8.0f }, { 170.0f, 2.0 }, { 256.0f, 33554430.0f }, { 120.0f, 5.0f }
340 };
341 SkRRect rr;
342 rr.setRectRadii(r, radii);
343 canvas->clipRRect(rr, SkRegion::kIntersect_Op, false);
344
345 SkRect r2 = SkRect::MakeLTRB(0, 33, 1102, 33554464);
346 canvas->drawRect(r2, p);
347 }
348
DEF_TEST(DrawPath,reporter)349 DEF_TEST(DrawPath, reporter) {
350 test_giantaa();
351 test_bug533();
352 test_bigcubic();
353 test_crbug_124652();
354 test_crbug_140642();
355 test_crbug_140803();
356 test_inversepathwithclip();
357 // why?
358 if (false) test_crbug131181();
359 test_infinite_dash(reporter);
360 test_crbug_165432(reporter);
361 test_crbug_472147_simple(reporter);
362 test_crbug_472147_actual(reporter);
363 test_big_aa_rect(reporter);
364 test_halfway();
365 }
366