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::NewRasterPMColor(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<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480)); 98 99 SkPaint paint; 100 paint.setAntiAlias(true); 101 canvas->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, SkIntToScalar(20)); 129 path.quadTo(SkIntToScalar(10), SkIntToScalar(10), 130 SkIntToScalar(20), SkIntToScalar(20)); 131 path.toggleInverseFillType(); 132 133 SkPaint paint; 134 135 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480)); 136 canvas.get()->save(); 137 canvas.get()->clipRect(SkRect::MakeWH(SkIntToScalar(19), SkIntToScalar(11))); 138 139 paint.setAntiAlias(false); 140 canvas.get()->drawPath(path, paint); 141 paint.setAntiAlias(true); 142 canvas.get()->drawPath(path, paint); 143 144 canvas.get()->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, SkIntToScalar(10)); 151 path.quadTo(SkIntToScalar(10), SkIntToScalar(20), 152 SkIntToScalar(20), SkIntToScalar(10)); 153 canvas.get()->clipRect(SkRect::MakeXYWH(SkIntToScalar(0), SkIntToScalar(19), 154 SkIntToScalar(19), SkIntToScalar(11))); 155 156 paint.setAntiAlias(false); 157 canvas.get()->drawPath(path, paint); 158 paint.setAntiAlias(true); 159 canvas.get()->drawPath(path, paint); 160 } 161 162 static void test_bug533() { 163 /* 164 http://code.google.com/p/skia/issues/detail?id=533 165 This particular test/bug only applies to the float case, where the 166 coordinates are very large. 167 */ 168 SkPath path; 169 path.moveTo(64, 3); 170 path.quadTo(-329936, -100000000, 1153, 330003); 171 172 SkPaint paint; 173 paint.setAntiAlias(true); 174 175 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480)); 176 canvas.get()->drawPath(path, paint); 177 } 178 179 static void test_crbug_140642() { 180 /* 181 * We used to see this construct, and due to rounding as we accumulated 182 * our length, the loop where we apply the phase would run off the end of 183 * the array, since it relied on just -= each interval value, which did not 184 * behave as "expected". Now the code explicitly checks for walking off the 185 * end of that array. 186 187 * A different (better) fix might be to rewrite dashing to do all of its 188 * length/phase/measure math using double, but this may need to be 189 * coordinated with SkPathMeasure, to be consistent between the two. 190 191 <path stroke="mintcream" stroke-dasharray="27734 35660 2157846850 247" 192 stroke-dashoffset="-248.135982067"> 193 */ 194 195 const SkScalar vals[] = { 27734, 35660, 2157846850.0f, 247 }; 196 SkAutoTUnref<SkDashPathEffect> dontAssert(SkDashPathEffect::Create(vals, 4, -248.135982067f)); 197 } 198 199 static void test_crbug_124652() { 200 /* 201 http://code.google.com/p/chromium/issues/detail?id=124652 202 This particular test/bug only applies to the float case, where 203 large values can "swamp" small ones. 204 */ 205 SkScalar intervals[2] = {837099584, 33450}; 206 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, -10)); 207 } 208 209 static void test_bigcubic() { 210 SkPath path; 211 path.moveTo(64, 3); 212 path.cubicTo(-329936, -100000000, -329936, 100000000, 1153, 330003); 213 214 SkPaint paint; 215 paint.setAntiAlias(true); 216 217 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(640, 480)); 218 canvas.get()->drawPath(path, paint); 219 } 220 221 // we used to assert if the bounds of the device (clip) was larger than 32K 222 // even when the path itself was smaller. We just draw and hope in the debug 223 // version to not assert. 224 static void test_giantaa() { 225 const int W = 400; 226 const int H = 400; 227 SkAutoTUnref<SkCanvas> canvas(SkCanvas::NewRasterN32(33000, 10)); 228 229 SkPaint paint; 230 paint.setAntiAlias(true); 231 SkPath path; 232 path.addOval(SkRect::MakeXYWH(-10, -10, 20 + W, 20 + H)); 233 canvas.get()->drawPath(path, paint); 234 } 235 236 // Extremely large path_length/dash_length ratios may cause infinite looping 237 // in SkDashPathEffect::filterPath() due to single precision rounding. 238 // The test is quite expensive, but it should get much faster after the fix 239 // for http://crbug.com/165432 goes in. 240 static void test_infinite_dash(skiatest::Reporter* reporter) { 241 SkPath path; 242 path.moveTo(0, 0); 243 path.lineTo(5000000, 0); 244 245 SkScalar intervals[] = { 0.2f, 0.2f }; 246 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0)); 247 248 SkPath filteredPath; 249 SkPaint paint; 250 paint.setStyle(SkPaint::kStroke_Style); 251 paint.setPathEffect(dash); 252 253 paint.getFillPath(path, &filteredPath); 254 // If we reach this, we passed. 255 REPORTER_ASSERT(reporter, true); 256 } 257 258 // http://crbug.com/165432 259 // Limit extreme dash path effects to avoid exhausting the system memory. 260 static void test_crbug_165432(skiatest::Reporter* reporter) { 261 SkPath path; 262 path.moveTo(0, 0); 263 path.lineTo(10000000, 0); 264 265 SkScalar intervals[] = { 0.5f, 0.5f }; 266 SkAutoTUnref<SkDashPathEffect> dash(SkDashPathEffect::Create(intervals, 2, 0)); 267 268 SkPaint paint; 269 paint.setStyle(SkPaint::kStroke_Style); 270 paint.setPathEffect(dash); 271 272 SkPath filteredPath; 273 SkStrokeRec rec(paint); 274 REPORTER_ASSERT(reporter, !dash->filterPath(&filteredPath, path, &rec, NULL)); 275 REPORTER_ASSERT(reporter, filteredPath.isEmpty()); 276 } 277 278 DEF_TEST(DrawPath, reporter) { 279 test_giantaa(); 280 test_bug533(); 281 test_bigcubic(); 282 test_crbug_124652(); 283 test_crbug_140642(); 284 test_crbug_140803(); 285 test_inversepathwithclip(); 286 // why? 287 if (false) test_crbug131181(); 288 test_infinite_dash(reporter); 289 test_crbug_165432(reporter); 290 test_big_aa_rect(reporter); 291 } 292
