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 "SkSurface.h" 12 #include "Test.h" 13 14 // test that we can draw an aa-rect at coordinates > 32K (bigger than fixedpoint) 15 static void test_big_aa_rect(skiatest::Reporter* reporter) { 16 SkBitmap output; 17 SkPMColor pixel[1]; 18 output.installPixels(SkImageInfo::MakeN32Premul(1, 1), pixel, 4); 19 20 SkSurface* surf = SkSurface::NewRasterN32Premul(300, 33300); 21 SkCanvas* canvas = surf->getCanvas(); 22 23 SkRect r = { 0, 33000, 300, 33300 }; 24 int x = SkScalarRoundToInt(r.left()); 25 int y = SkScalarRoundToInt(r.top()); 26 27 // check that the pixel in question starts as transparent (by the surface) 28 if (canvas->readPixels(&output, x, y)) { 29 REPORTER_ASSERT(reporter, 0 == pixel[0]); 30 } else { 31 REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed"); 32 } 33 34 SkPaint paint; 35 paint.setAntiAlias(true); 36 paint.setColor(SK_ColorWHITE); 37 38 canvas->drawRect(r, paint); 39 40 // Now check that it is BLACK 41 if (canvas->readPixels(&output, x, y)) { 42 // don't know what swizzling PMColor did, but white should always 43 // appear the same. 44 REPORTER_ASSERT(reporter, 0xFFFFFFFF == pixel[0]); 45 } else { 46 REPORTER_ASSERT_MESSAGE(reporter, false, "readPixels failed"); 47 } 48 surf->unref(); 49 } 50 51 /////////////////////////////////////////////////////////////////////////////// 52 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 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 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 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(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 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 // 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 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(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 } 159 160 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 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480)); 174 surface->getCanvas()->drawPath(path, paint); 175 } 176 177 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 SkAutoTUnref<SkDashPathEffect> dontAssert(SkDashPathEffect::Create(vals, 4, -248.135982067f)); 195 } 196 197 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 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, -10)); 205 } 206 207 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 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(640, 480)); 216 surface->getCanvas()->drawPath(path, paint); 217 } 218 219 // we used to assert if the bounds of the device (clip) was larger than 32K 220 // even when the path itself was smaller. We just draw and hope in the debug 221 // version to not assert. 222 static void test_giantaa() { 223 const int W = 400; 224 const int H = 400; 225 SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(33000, 10)); 226 227 SkPaint paint; 228 paint.setAntiAlias(true); 229 SkPath path; 230 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H)); 231 surface->getCanvas()->drawPath(path, paint); 232 } 233 234 // Extremely large path_length/dash_length ratios may cause infinite looping 235 // in SkDashPathEffect::filterPath() due to single precision rounding. 236 // The test is quite expensive, but it should get much faster after the fix 237 // for http://crbug.com/165432 goes in. 238 static void test_infinite_dash(skiatest::Reporter* reporter) { 239 SkPath path; 240 path.moveTo(0, 0); 241 path.lineTo(5000000, 0); 242 243 SkScalar intervals[] = { 0.2f, 0.2f }; 244 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0)); 245 246 SkPath filteredPath; 247 SkPaint paint; 248 paint.setStyle(SkPaint::kStroke_Style); 249 paint.setPathEffect(dash); 250 251 paint.getFillPath(path, &filteredPath); 252 // If we reach this, we passed. 253 REPORTER_ASSERT(reporter, true); 254 } 255 256 // http://crbug.com/165432 257 // Limit extreme dash path effects to avoid exhausting the system memory. 258 static void test_crbug_165432(skiatest::Reporter* reporter) { 259 SkPath path; 260 path.moveTo(0, 0); 261 path.lineTo(10000000, 0); 262 263 SkScalar intervals[] = { 0.5f, 0.5f }; 264 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0)); 265 266 SkPaint paint; 267 paint.setStyle(SkPaint::kStroke_Style); 268 paint.setPathEffect(dash); 269 270 SkPath filteredPath; 271 SkStrokeRec rec(paint); 272 REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, NULL)); 273 REPORTER_ASSERT(reporter, filteredPath.isEmpty()); 274 } 275 276 DEF_TEST(DrawPath, reporter) { 277 test_giantaa(); 278 test_bug533(); 279 test_bigcubic(); 280 test_crbug_124652(); 281 test_crbug_140642(); 282 test_crbug_140803(); 283 test_inversepathwithclip(); 284 // why? 285 if (false) test_crbug131181(); 286 test_infinite_dash(reporter); 287 test_crbug_165432(reporter); 288 test_big_aa_rect(reporter); 289 } 290
