caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 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 | #include "SkIntersections.h" |
| 8 | #include "SkOpSegment.h" |
| 9 | #include "SkPathWriter.h" |
caryclark@google.com | 7dfbb07 | 2013-04-22 14:37:05 +0000 | [diff] [blame] | 10 | #include "SkTSort.h" |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 11 | |
| 12 | #define F (false) // discard the edge |
| 13 | #define T (true) // keep the edge |
| 14 | |
| 15 | static const bool gUnaryActiveEdge[2][2] = { |
| 16 | // from=0 from=1 |
| 17 | // to=0,1 to=0,1 |
| 18 | {F, T}, {T, F}, |
| 19 | }; |
| 20 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 21 | static const bool gActiveEdge[kXOR_PathOp + 1][2][2][2][2] = { |
| 22 | // miFrom=0 miFrom=1 |
| 23 | // miTo=0 miTo=1 miTo=0 miTo=1 |
| 24 | // suFrom=0 1 suFrom=0 1 suFrom=0 1 suFrom=0 1 |
| 25 | // suTo=0,1 suTo=0,1 suTo=0,1 suTo=0,1 suTo=0,1 suTo=0,1 suTo=0,1 suTo=0,1 |
| 26 | {{{{F, F}, {F, F}}, {{T, F}, {T, F}}}, {{{T, T}, {F, F}}, {{F, T}, {T, F}}}}, // mi - su |
| 27 | {{{{F, F}, {F, F}}, {{F, T}, {F, T}}}, {{{F, F}, {T, T}}, {{F, T}, {T, F}}}}, // mi & su |
| 28 | {{{{F, T}, {T, F}}, {{T, T}, {F, F}}}, {{{T, F}, {T, F}}, {{F, F}, {F, F}}}}, // mi | su |
| 29 | {{{{F, T}, {T, F}}, {{T, F}, {F, T}}}, {{{T, F}, {F, T}}, {{F, T}, {T, F}}}}, // mi ^ su |
| 30 | }; |
| 31 | |
| 32 | #undef F |
| 33 | #undef T |
| 34 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 35 | enum { |
| 36 | kOutsideTrackedTCount = 16, // FIXME: determine what this should be |
| 37 | kMissingSpanCount = 4, // FIXME: determine what this should be |
| 38 | }; |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 39 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 40 | // note that this follows the same logic flow as build angles |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 41 | bool SkOpSegment::activeAngle(int index, int* done, SkTArray<SkOpAngle, true>* angles) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 42 | if (activeAngleInner(index, done, angles)) { |
| 43 | return true; |
| 44 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 45 | double referenceT = fTs[index].fT; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 46 | int lesser = index; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 47 | while (--lesser >= 0 |
| 48 | && (precisely_negative(referenceT - fTs[lesser].fT) || fTs[lesser].fTiny)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 49 | if (activeAngleOther(lesser, done, angles)) { |
| 50 | return true; |
| 51 | } |
| 52 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 53 | do { |
| 54 | if (activeAngleOther(index, done, angles)) { |
| 55 | return true; |
| 56 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 57 | if (++index == fTs.count()) { |
| 58 | break; |
| 59 | } |
| 60 | if (fTs[index - 1].fTiny) { |
| 61 | referenceT = fTs[index].fT; |
| 62 | continue; |
| 63 | } |
| 64 | } while (precisely_negative(fTs[index].fT - referenceT)); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 65 | return false; |
| 66 | } |
| 67 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 68 | bool SkOpSegment::activeAngleOther(int index, int* done, SkTArray<SkOpAngle, true>* angles) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 69 | SkOpSpan* span = &fTs[index]; |
| 70 | SkOpSegment* other = span->fOther; |
| 71 | int oIndex = span->fOtherIndex; |
| 72 | return other->activeAngleInner(oIndex, done, angles); |
| 73 | } |
| 74 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 75 | bool SkOpSegment::activeAngleInner(int index, int* done, SkTArray<SkOpAngle, true>* angles) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 76 | int next = nextExactSpan(index, 1); |
| 77 | if (next > 0) { |
| 78 | SkOpSpan& upSpan = fTs[index]; |
| 79 | if (upSpan.fWindValue || upSpan.fOppValue) { |
| 80 | addAngle(angles, index, next); |
| 81 | if (upSpan.fDone || upSpan.fUnsortableEnd) { |
| 82 | (*done)++; |
| 83 | } else if (upSpan.fWindSum != SK_MinS32) { |
| 84 | return true; |
| 85 | } |
| 86 | } else if (!upSpan.fDone) { |
| 87 | upSpan.fDone = true; |
| 88 | fDoneSpans++; |
| 89 | } |
| 90 | } |
| 91 | int prev = nextExactSpan(index, -1); |
| 92 | // edge leading into junction |
| 93 | if (prev >= 0) { |
| 94 | SkOpSpan& downSpan = fTs[prev]; |
| 95 | if (downSpan.fWindValue || downSpan.fOppValue) { |
| 96 | addAngle(angles, index, prev); |
| 97 | if (downSpan.fDone) { |
| 98 | (*done)++; |
| 99 | } else if (downSpan.fWindSum != SK_MinS32) { |
| 100 | return true; |
| 101 | } |
| 102 | } else if (!downSpan.fDone) { |
| 103 | downSpan.fDone = true; |
| 104 | fDoneSpans++; |
| 105 | } |
| 106 | } |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | SkPoint SkOpSegment::activeLeftTop(bool onlySortable, int* firstT) const { |
| 111 | SkASSERT(!done()); |
| 112 | SkPoint topPt = {SK_ScalarMax, SK_ScalarMax}; |
| 113 | int count = fTs.count(); |
| 114 | // see if either end is not done since we want smaller Y of the pair |
| 115 | bool lastDone = true; |
| 116 | bool lastUnsortable = false; |
| 117 | double lastT = -1; |
| 118 | for (int index = 0; index < count; ++index) { |
| 119 | const SkOpSpan& span = fTs[index]; |
| 120 | if (onlySortable && (span.fUnsortableStart || lastUnsortable)) { |
| 121 | goto next; |
| 122 | } |
| 123 | if (span.fDone && lastDone) { |
| 124 | goto next; |
| 125 | } |
| 126 | if (approximately_negative(span.fT - lastT)) { |
| 127 | goto next; |
| 128 | } |
| 129 | { |
| 130 | const SkPoint& xy = xyAtT(&span); |
| 131 | if (topPt.fY > xy.fY || (topPt.fY == xy.fY && topPt.fX > xy.fX)) { |
| 132 | topPt = xy; |
| 133 | if (firstT) { |
| 134 | *firstT = index; |
| 135 | } |
| 136 | } |
| 137 | if (fVerb != SkPath::kLine_Verb && !lastDone) { |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 138 | SkPoint curveTop = (*CurveTop[SkPathOpsVerbToPoints(fVerb)])(fPts, lastT, span.fT); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 139 | if (topPt.fY > curveTop.fY || (topPt.fY == curveTop.fY |
| 140 | && topPt.fX > curveTop.fX)) { |
| 141 | topPt = curveTop; |
| 142 | if (firstT) { |
| 143 | *firstT = index; |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | lastT = span.fT; |
| 148 | } |
| 149 | next: |
| 150 | lastDone = span.fDone; |
| 151 | lastUnsortable = span.fUnsortableEnd; |
| 152 | } |
| 153 | return topPt; |
| 154 | } |
| 155 | |
| 156 | bool SkOpSegment::activeOp(int index, int endIndex, int xorMiMask, int xorSuMask, SkPathOp op) { |
| 157 | int sumMiWinding = updateWinding(endIndex, index); |
| 158 | int sumSuWinding = updateOppWinding(endIndex, index); |
| 159 | if (fOperand) { |
| 160 | SkTSwap<int>(sumMiWinding, sumSuWinding); |
| 161 | } |
| 162 | int maxWinding, sumWinding, oppMaxWinding, oppSumWinding; |
| 163 | return activeOp(xorMiMask, xorSuMask, index, endIndex, op, &sumMiWinding, &sumSuWinding, |
| 164 | &maxWinding, &sumWinding, &oppMaxWinding, &oppSumWinding); |
| 165 | } |
| 166 | |
| 167 | bool SkOpSegment::activeOp(int xorMiMask, int xorSuMask, int index, int endIndex, SkPathOp op, |
| 168 | int* sumMiWinding, int* sumSuWinding, |
| 169 | int* maxWinding, int* sumWinding, int* oppMaxWinding, int* oppSumWinding) { |
| 170 | setUpWindings(index, endIndex, sumMiWinding, sumSuWinding, |
| 171 | maxWinding, sumWinding, oppMaxWinding, oppSumWinding); |
| 172 | bool miFrom; |
| 173 | bool miTo; |
| 174 | bool suFrom; |
| 175 | bool suTo; |
| 176 | if (operand()) { |
| 177 | miFrom = (*oppMaxWinding & xorMiMask) != 0; |
| 178 | miTo = (*oppSumWinding & xorMiMask) != 0; |
| 179 | suFrom = (*maxWinding & xorSuMask) != 0; |
| 180 | suTo = (*sumWinding & xorSuMask) != 0; |
| 181 | } else { |
| 182 | miFrom = (*maxWinding & xorMiMask) != 0; |
| 183 | miTo = (*sumWinding & xorMiMask) != 0; |
| 184 | suFrom = (*oppMaxWinding & xorSuMask) != 0; |
| 185 | suTo = (*oppSumWinding & xorSuMask) != 0; |
| 186 | } |
| 187 | bool result = gActiveEdge[op][miFrom][miTo][suFrom][suTo]; |
| 188 | #if DEBUG_ACTIVE_OP |
| 189 | SkDebugf("%s op=%s miFrom=%d miTo=%d suFrom=%d suTo=%d result=%d\n", __FUNCTION__, |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 190 | SkPathOpsDebug::kPathOpStr[op], miFrom, miTo, suFrom, suTo, result); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 191 | #endif |
| 192 | return result; |
| 193 | } |
| 194 | |
| 195 | bool SkOpSegment::activeWinding(int index, int endIndex) { |
| 196 | int sumWinding = updateWinding(endIndex, index); |
| 197 | int maxWinding; |
| 198 | return activeWinding(index, endIndex, &maxWinding, &sumWinding); |
| 199 | } |
| 200 | |
| 201 | bool SkOpSegment::activeWinding(int index, int endIndex, int* maxWinding, int* sumWinding) { |
| 202 | setUpWinding(index, endIndex, maxWinding, sumWinding); |
| 203 | bool from = *maxWinding != 0; |
| 204 | bool to = *sumWinding != 0; |
| 205 | bool result = gUnaryActiveEdge[from][to]; |
| 206 | return result; |
| 207 | } |
| 208 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 209 | void SkOpSegment::addAngle(SkTArray<SkOpAngle, true>* anglesPtr, int start, int end) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 210 | SkASSERT(start != end); |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 211 | SkOpAngle& angle = anglesPtr->push_back(); |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 212 | angle.set(this, start, end); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 213 | } |
| 214 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 215 | void SkOpSegment::addCancelOutsides(const SkPoint& startPt, const SkPoint& endPt, |
| 216 | SkOpSegment* other) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 217 | int tIndex = -1; |
| 218 | int tCount = fTs.count(); |
| 219 | int oIndex = -1; |
| 220 | int oCount = other->fTs.count(); |
| 221 | do { |
| 222 | ++tIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 223 | } while (startPt != fTs[tIndex].fPt && tIndex < tCount); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 224 | int tIndexStart = tIndex; |
| 225 | do { |
| 226 | ++oIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 227 | } while (endPt != other->fTs[oIndex].fPt && oIndex < oCount); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 228 | int oIndexStart = oIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 229 | const SkPoint* nextPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 230 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 231 | nextPt = &fTs[++tIndex].fPt; |
| 232 | SkASSERT(fTs[tIndex].fT < 1 || startPt != *nextPt); |
| 233 | } while (startPt == *nextPt); |
| 234 | double nextT = fTs[tIndex].fT; |
| 235 | const SkPoint* oNextPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 236 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 237 | oNextPt = &other->fTs[++oIndex].fPt; |
| 238 | SkASSERT(other->fTs[oIndex].fT < 1 || endPt != *oNextPt); |
| 239 | } while (endPt == *oNextPt); |
| 240 | double oNextT = other->fTs[oIndex].fT; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 241 | // at this point, spans before and after are at: |
| 242 | // fTs[tIndexStart - 1], fTs[tIndexStart], fTs[tIndex] |
| 243 | // if tIndexStart == 0, no prior span |
| 244 | // if nextT == 1, no following span |
| 245 | |
| 246 | // advance the span with zero winding |
| 247 | // if the following span exists (not past the end, non-zero winding) |
| 248 | // connect the two edges |
| 249 | if (!fTs[tIndexStart].fWindValue) { |
| 250 | if (tIndexStart > 0 && fTs[tIndexStart - 1].fWindValue) { |
| 251 | #if DEBUG_CONCIDENT |
| 252 | SkDebugf("%s 1 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n", |
| 253 | __FUNCTION__, fID, other->fID, tIndexStart - 1, |
| 254 | fTs[tIndexStart].fT, xyAtT(tIndexStart).fX, |
| 255 | xyAtT(tIndexStart).fY); |
| 256 | #endif |
| 257 | addTPair(fTs[tIndexStart].fT, other, other->fTs[oIndex].fT, false, |
| 258 | fTs[tIndexStart].fPt); |
| 259 | } |
| 260 | if (nextT < 1 && fTs[tIndex].fWindValue) { |
| 261 | #if DEBUG_CONCIDENT |
| 262 | SkDebugf("%s 2 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n", |
| 263 | __FUNCTION__, fID, other->fID, tIndex, |
| 264 | fTs[tIndex].fT, xyAtT(tIndex).fX, |
| 265 | xyAtT(tIndex).fY); |
| 266 | #endif |
| 267 | addTPair(fTs[tIndex].fT, other, other->fTs[oIndexStart].fT, false, fTs[tIndex].fPt); |
| 268 | } |
| 269 | } else { |
| 270 | SkASSERT(!other->fTs[oIndexStart].fWindValue); |
| 271 | if (oIndexStart > 0 && other->fTs[oIndexStart - 1].fWindValue) { |
| 272 | #if DEBUG_CONCIDENT |
| 273 | SkDebugf("%s 3 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n", |
| 274 | __FUNCTION__, fID, other->fID, oIndexStart - 1, |
| 275 | other->fTs[oIndexStart].fT, other->xyAtT(oIndexStart).fX, |
| 276 | other->xyAtT(oIndexStart).fY); |
| 277 | other->debugAddTPair(other->fTs[oIndexStart].fT, *this, fTs[tIndex].fT); |
| 278 | #endif |
| 279 | } |
| 280 | if (oNextT < 1 && other->fTs[oIndex].fWindValue) { |
| 281 | #if DEBUG_CONCIDENT |
| 282 | SkDebugf("%s 4 this=%d other=%d t [%d] %1.9g (%1.9g,%1.9g)\n", |
| 283 | __FUNCTION__, fID, other->fID, oIndex, |
| 284 | other->fTs[oIndex].fT, other->xyAtT(oIndex).fX, |
| 285 | other->xyAtT(oIndex).fY); |
| 286 | other->debugAddTPair(other->fTs[oIndex].fT, *this, fTs[tIndexStart].fT); |
| 287 | #endif |
| 288 | } |
| 289 | } |
| 290 | } |
| 291 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 292 | void SkOpSegment::addCoinOutsides(const SkPoint& startPt, const SkPoint& endPt, |
| 293 | SkOpSegment* other) { |
| 294 | // walk this to startPt |
| 295 | // walk other to startPt |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 296 | // if either is > 0, add a pointer to the other, copying adjacent winding |
| 297 | int tIndex = -1; |
| 298 | int oIndex = -1; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 299 | do { |
| 300 | ++tIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 301 | } while (startPt != fTs[tIndex].fPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 302 | do { |
| 303 | ++oIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 304 | } while (startPt != other->fTs[oIndex].fPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 305 | if (tIndex > 0 || oIndex > 0 || fOperand != other->fOperand) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 306 | addTPair(fTs[tIndex].fT, other, other->fTs[oIndex].fT, false, startPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 307 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 308 | SkPoint nextPt = startPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 309 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 310 | const SkPoint* workPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 311 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 312 | workPt = &fTs[++tIndex].fPt; |
| 313 | } while (nextPt == *workPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 314 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 315 | workPt = &other->fTs[++oIndex].fPt; |
| 316 | } while (nextPt == *workPt); |
| 317 | nextPt = *workPt; |
| 318 | double tStart = fTs[tIndex].fT; |
| 319 | double oStart = other->fTs[oIndex].fT; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 320 | if (tStart == 1 && oStart == 1 && fOperand == other->fOperand) { |
| 321 | break; |
| 322 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 323 | addTPair(tStart, other, oStart, false, nextPt); |
| 324 | } while (endPt != nextPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | void SkOpSegment::addCubic(const SkPoint pts[4], bool operand, bool evenOdd) { |
| 328 | init(pts, SkPath::kCubic_Verb, operand, evenOdd); |
| 329 | fBounds.setCubicBounds(pts); |
| 330 | } |
| 331 | |
| 332 | void SkOpSegment::addCurveTo(int start, int end, SkPathWriter* path, bool active) const { |
| 333 | SkPoint edge[4]; |
| 334 | const SkPoint* ePtr; |
| 335 | int lastT = fTs.count() - 1; |
| 336 | if (lastT < 0 || (start == 0 && end == lastT) || (start == lastT && end == 0)) { |
| 337 | ePtr = fPts; |
| 338 | } else { |
| 339 | // OPTIMIZE? if not active, skip remainder and return xyAtT(end) |
| 340 | subDivide(start, end, edge); |
| 341 | ePtr = edge; |
| 342 | } |
| 343 | if (active) { |
| 344 | bool reverse = ePtr == fPts && start != 0; |
| 345 | if (reverse) { |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 346 | path->deferredMoveLine(ePtr[SkPathOpsVerbToPoints(fVerb)]); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 347 | switch (fVerb) { |
| 348 | case SkPath::kLine_Verb: |
| 349 | path->deferredLine(ePtr[0]); |
| 350 | break; |
| 351 | case SkPath::kQuad_Verb: |
| 352 | path->quadTo(ePtr[1], ePtr[0]); |
| 353 | break; |
| 354 | case SkPath::kCubic_Verb: |
| 355 | path->cubicTo(ePtr[2], ePtr[1], ePtr[0]); |
| 356 | break; |
| 357 | default: |
| 358 | SkASSERT(0); |
| 359 | } |
| 360 | // return ePtr[0]; |
| 361 | } else { |
| 362 | path->deferredMoveLine(ePtr[0]); |
| 363 | switch (fVerb) { |
| 364 | case SkPath::kLine_Verb: |
| 365 | path->deferredLine(ePtr[1]); |
| 366 | break; |
| 367 | case SkPath::kQuad_Verb: |
| 368 | path->quadTo(ePtr[1], ePtr[2]); |
| 369 | break; |
| 370 | case SkPath::kCubic_Verb: |
| 371 | path->cubicTo(ePtr[1], ePtr[2], ePtr[3]); |
| 372 | break; |
| 373 | default: |
| 374 | SkASSERT(0); |
| 375 | } |
| 376 | } |
| 377 | } |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 378 | // return ePtr[SkPathOpsVerbToPoints(fVerb)]; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | void SkOpSegment::addLine(const SkPoint pts[2], bool operand, bool evenOdd) { |
| 382 | init(pts, SkPath::kLine_Verb, operand, evenOdd); |
| 383 | fBounds.set(pts, 2); |
| 384 | } |
| 385 | |
| 386 | // add 2 to edge or out of range values to get T extremes |
| 387 | void SkOpSegment::addOtherT(int index, double otherT, int otherIndex) { |
| 388 | SkOpSpan& span = fTs[index]; |
caryclark@google.com | 0361032 | 2013-04-18 15:58:21 +0000 | [diff] [blame] | 389 | if (precisely_zero(otherT)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 390 | otherT = 0; |
caryclark@google.com | 0361032 | 2013-04-18 15:58:21 +0000 | [diff] [blame] | 391 | } else if (precisely_equal(otherT, 1)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 392 | otherT = 1; |
| 393 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 394 | span.fOtherT = otherT; |
| 395 | span.fOtherIndex = otherIndex; |
| 396 | } |
| 397 | |
| 398 | void SkOpSegment::addQuad(const SkPoint pts[3], bool operand, bool evenOdd) { |
| 399 | init(pts, SkPath::kQuad_Verb, operand, evenOdd); |
| 400 | fBounds.setQuadBounds(pts); |
| 401 | } |
| 402 | |
| 403 | // Defer all coincident edge processing until |
| 404 | // after normal intersections have been computed |
| 405 | |
| 406 | // no need to be tricky; insert in normal T order |
| 407 | // resolve overlapping ts when considering coincidence later |
| 408 | |
| 409 | // add non-coincident intersection. Resulting edges are sorted in T. |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 410 | int SkOpSegment::addT(SkOpSegment* other, const SkPoint& pt, double newT) { |
caryclark@google.com | 0361032 | 2013-04-18 15:58:21 +0000 | [diff] [blame] | 411 | if (precisely_zero(newT)) { |
| 412 | newT = 0; |
| 413 | } else if (precisely_equal(newT, 1)) { |
| 414 | newT = 1; |
| 415 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 416 | // FIXME: in the pathological case where there is a ton of intercepts, |
| 417 | // binary search? |
| 418 | int insertedAt = -1; |
| 419 | size_t tCount = fTs.count(); |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 420 | const SkPoint& firstPt = fPts[0]; |
| 421 | const SkPoint& lastPt = fPts[SkPathOpsVerbToPoints(fVerb)]; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 422 | for (size_t index = 0; index < tCount; ++index) { |
| 423 | // OPTIMIZATION: if there are three or more identical Ts, then |
| 424 | // the fourth and following could be further insertion-sorted so |
| 425 | // that all the edges are clockwise or counterclockwise. |
| 426 | // This could later limit segment tests to the two adjacent |
| 427 | // neighbors, although it doesn't help with determining which |
| 428 | // circular direction to go in. |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 429 | const SkOpSpan& span = fTs[index]; |
| 430 | if (newT < span.fT) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 431 | insertedAt = index; |
| 432 | break; |
| 433 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 434 | if (newT == span.fT) { |
| 435 | if (pt == span.fPt) { |
| 436 | insertedAt = index; |
| 437 | break; |
| 438 | } |
| 439 | if ((pt == firstPt && newT == 0) || (span.fPt == lastPt && newT == 1)) { |
| 440 | insertedAt = index; |
| 441 | break; |
| 442 | } |
| 443 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 444 | } |
| 445 | SkOpSpan* span; |
| 446 | if (insertedAt >= 0) { |
| 447 | span = fTs.insert(insertedAt); |
| 448 | } else { |
| 449 | insertedAt = tCount; |
| 450 | span = fTs.append(); |
| 451 | } |
| 452 | span->fT = newT; |
| 453 | span->fOther = other; |
| 454 | span->fPt = pt; |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 455 | #if 0 |
| 456 | // cubics, for instance, may not be exact enough to satisfy this check (e.g., cubicOp69d) |
| 457 | SkASSERT(approximately_equal(xyAtT(newT).fX, pt.fX) |
| 458 | && approximately_equal(xyAtT(newT).fY, pt.fY)); |
| 459 | #endif |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 460 | span->fWindSum = SK_MinS32; |
| 461 | span->fOppSum = SK_MinS32; |
| 462 | span->fWindValue = 1; |
| 463 | span->fOppValue = 0; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 464 | span->fSmall = false; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 465 | span->fTiny = false; |
| 466 | span->fLoop = false; |
| 467 | if ((span->fDone = newT == 1)) { |
| 468 | ++fDoneSpans; |
| 469 | } |
| 470 | span->fUnsortableStart = false; |
| 471 | span->fUnsortableEnd = false; |
| 472 | int less = -1; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 473 | while (&span[less + 1] - fTs.begin() > 0 && AlmostEqualUlps(span[less].fPt, span->fPt)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 474 | if (span[less].fDone) { |
| 475 | break; |
| 476 | } |
| 477 | double tInterval = newT - span[less].fT; |
| 478 | if (precisely_negative(tInterval)) { |
| 479 | break; |
| 480 | } |
| 481 | if (fVerb == SkPath::kCubic_Verb) { |
| 482 | double tMid = newT - tInterval / 2; |
| 483 | SkDPoint midPt = dcubic_xy_at_t(fPts, tMid); |
| 484 | if (!midPt.approximatelyEqual(xyAtT(span))) { |
| 485 | break; |
| 486 | } |
| 487 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 488 | span[less].fSmall = true; |
| 489 | bool tiny = span[less].fPt == span->fPt; |
| 490 | span[less].fTiny = tiny; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 491 | span[less].fDone = true; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 492 | if (approximately_negative(newT - span[less].fT) && tiny) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 493 | if (approximately_greater_than_one(newT)) { |
| 494 | SkASSERT(&span[less] - fTs.begin() < fTs.count()); |
| 495 | span[less].fUnsortableStart = true; |
| 496 | if (&span[less - 1] - fTs.begin() >= 0) { |
| 497 | span[less - 1].fUnsortableEnd = true; |
| 498 | } |
| 499 | } |
| 500 | if (approximately_less_than_zero(span[less].fT)) { |
| 501 | SkASSERT(&span[less + 1] - fTs.begin() < fTs.count()); |
| 502 | SkASSERT(&span[less] - fTs.begin() >= 0); |
| 503 | span[less + 1].fUnsortableStart = true; |
| 504 | span[less].fUnsortableEnd = true; |
| 505 | } |
| 506 | } |
| 507 | ++fDoneSpans; |
| 508 | --less; |
| 509 | } |
| 510 | int more = 1; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 511 | while (fTs.end() - &span[more - 1] > 1 && AlmostEqualUlps(span[more].fPt, span->fPt)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 512 | if (span[more - 1].fDone) { |
| 513 | break; |
| 514 | } |
| 515 | double tEndInterval = span[more].fT - newT; |
| 516 | if (precisely_negative(tEndInterval)) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 517 | if ((span->fTiny = span[more].fTiny)) { |
| 518 | span->fDone = true; |
| 519 | ++fDoneSpans; |
| 520 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 521 | break; |
| 522 | } |
| 523 | if (fVerb == SkPath::kCubic_Verb) { |
| 524 | double tMid = newT - tEndInterval / 2; |
| 525 | SkDPoint midEndPt = dcubic_xy_at_t(fPts, tMid); |
| 526 | if (!midEndPt.approximatelyEqual(xyAtT(span))) { |
| 527 | break; |
| 528 | } |
| 529 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 530 | span[more - 1].fSmall = true; |
| 531 | bool tiny = span[more].fPt == span->fPt; |
| 532 | span[more - 1].fTiny = tiny; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 533 | span[more - 1].fDone = true; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 534 | if (approximately_negative(span[more].fT - newT) && tiny) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 535 | if (approximately_greater_than_one(span[more].fT)) { |
| 536 | span[more + 1].fUnsortableStart = true; |
| 537 | span[more].fUnsortableEnd = true; |
| 538 | } |
| 539 | if (approximately_less_than_zero(newT)) { |
| 540 | span[more].fUnsortableStart = true; |
| 541 | span[more - 1].fUnsortableEnd = true; |
| 542 | } |
| 543 | } |
| 544 | ++fDoneSpans; |
| 545 | ++more; |
| 546 | } |
| 547 | return insertedAt; |
| 548 | } |
| 549 | |
| 550 | // set spans from start to end to decrement by one |
| 551 | // note this walks other backwards |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 552 | // FIXME: there's probably an edge case that can be constructed where |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 553 | // two span in one segment are separated by float epsilon on one span but |
| 554 | // not the other, if one segment is very small. For this |
| 555 | // case the counts asserted below may or may not be enough to separate the |
| 556 | // spans. Even if the counts work out, what if the spans aren't correctly |
| 557 | // sorted? It feels better in such a case to match the span's other span |
| 558 | // pointer since both coincident segments must contain the same spans. |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 559 | // FIXME? It seems that decrementing by one will fail for complex paths that |
| 560 | // have three or more coincident edges. Shouldn't this subtract the difference |
| 561 | // between the winding values? |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 562 | /* |--> |--> |
| 563 | this 0>>>>1>>>>2>>>>3>>>4 0>>>>1>>>>2>>>>3>>>4 0>>>>1>>>>2>>>>3>>>4 |
| 564 | other 2<<<<1<<<<0 2<<<<1<<<<0 2<<<<1<<<<0 |
| 565 | ^ ^ <--| <--| |
| 566 | startPt endPt test/oTest first pos test/oTest final pos |
| 567 | */ |
| 568 | void SkOpSegment::addTCancel(const SkPoint& startPt, const SkPoint& endPt, SkOpSegment* other) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 569 | bool binary = fOperand != other->fOperand; |
| 570 | int index = 0; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 571 | while (startPt != fTs[index].fPt) { |
| 572 | SkASSERT(index < fTs.count()); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 573 | ++index; |
| 574 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 575 | while (index > 0 && fTs[index].fT == fTs[index - 1].fT) { |
| 576 | --index; |
| 577 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 578 | int oIndex = other->fTs.count(); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 579 | while (startPt != other->fTs[--oIndex].fPt) { // look for startPt match |
| 580 | SkASSERT(oIndex > 0); |
| 581 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 582 | double oStartT = other->fTs[oIndex].fT; |
| 583 | // look for first point beyond match |
| 584 | while (startPt == other->fTs[--oIndex].fPt || oStartT == other->fTs[oIndex].fT) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 585 | SkASSERT(oIndex > 0); |
| 586 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 587 | SkOpSpan* test = &fTs[index]; |
| 588 | SkOpSpan* oTest = &other->fTs[oIndex]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 589 | SkSTArray<kOutsideTrackedTCount, SkPoint, true> outsidePts; |
| 590 | SkSTArray<kOutsideTrackedTCount, SkPoint, true> oOutsidePts; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 591 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 592 | SkASSERT(test->fT < 1); |
| 593 | SkASSERT(oTest->fT < 1); |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 594 | bool decrement = test->fWindValue && oTest->fWindValue; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 595 | bool track = test->fWindValue || oTest->fWindValue; |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 596 | bool bigger = test->fWindValue >= oTest->fWindValue; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 597 | const SkPoint& testPt = test->fPt; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 598 | double testT = test->fT; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 599 | const SkPoint& oTestPt = oTest->fPt; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 600 | double oTestT = oTest->fT; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 601 | do { |
| 602 | if (decrement) { |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 603 | if (binary && bigger) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 604 | test->fOppValue--; |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 605 | } else { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 606 | decrementSpan(test); |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 607 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 608 | } else if (track) { |
| 609 | TrackOutsidePair(&outsidePts, testPt, oTestPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 610 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 611 | SkASSERT(index < fTs.count() - 1); |
| 612 | test = &fTs[++index]; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 613 | } while (testPt == test->fPt || testT == test->fT); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 614 | SkDEBUGCODE(int originalWindValue = oTest->fWindValue); |
| 615 | do { |
| 616 | SkASSERT(oTest->fT < 1); |
| 617 | SkASSERT(originalWindValue == oTest->fWindValue); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 618 | if (decrement) { |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 619 | if (binary && !bigger) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 620 | oTest->fOppValue--; |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 621 | } else { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 622 | other->decrementSpan(oTest); |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 623 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 624 | } else if (track) { |
| 625 | TrackOutsidePair(&oOutsidePts, oTestPt, testPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 626 | } |
| 627 | if (!oIndex) { |
| 628 | break; |
| 629 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 630 | oTest = &other->fTs[--oIndex]; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 631 | } while (oTestPt == oTest->fPt || oTestT == oTest->fT); |
| 632 | } while (endPt != test->fPt && test->fT < 1); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 633 | // FIXME: determine if canceled edges need outside ts added |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 634 | int outCount = outsidePts.count(); |
| 635 | if (!done() && outCount) { |
| 636 | addCancelOutsides(outsidePts[0], outsidePts[1], other); |
| 637 | if (outCount > 2) { |
| 638 | addCancelOutsides(outsidePts[outCount - 2], outsidePts[outCount - 1], other); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 639 | } |
| 640 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 641 | if (!other->done() && oOutsidePts.count()) { |
| 642 | other->addCancelOutsides(oOutsidePts[0], oOutsidePts[1], this); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 643 | } |
| 644 | } |
| 645 | |
| 646 | int SkOpSegment::addSelfT(SkOpSegment* other, const SkPoint& pt, double newT) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 647 | // if the tail nearly intersects itself but not quite, the caller records this separately |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 648 | int result = addT(other, pt, newT); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 649 | SkOpSpan* span = &fTs[result]; |
| 650 | span->fLoop = true; |
| 651 | return result; |
| 652 | } |
| 653 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 654 | void SkOpSegment::bumpCoincidentThis(const SkOpSpan& oTest, bool binary, int* indexPtr, |
| 655 | SkTArray<SkPoint, true>* outsideTs) { |
| 656 | int index = *indexPtr; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 657 | int oWindValue = oTest.fWindValue; |
| 658 | int oOppValue = oTest.fOppValue; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 659 | if (binary) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 660 | SkTSwap<int>(oWindValue, oOppValue); |
| 661 | } |
| 662 | SkOpSpan* const test = &fTs[index]; |
| 663 | SkOpSpan* end = test; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 664 | const SkPoint& oStartPt = oTest.fPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 665 | do { |
| 666 | if (bumpSpan(end, oWindValue, oOppValue)) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 667 | TrackOutside(outsideTs, oStartPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 668 | } |
| 669 | end = &fTs[++index]; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 670 | } while ((end->fPt == test->fPt || end->fT == test->fT) && end->fT < 1); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 671 | *indexPtr = index; |
| 672 | } |
| 673 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 674 | // because of the order in which coincidences are resolved, this and other |
| 675 | // may not have the same intermediate points. Compute the corresponding |
| 676 | // intermediate T values (using this as the master, other as the follower) |
| 677 | // and walk other conditionally -- hoping that it catches up in the end |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 678 | void SkOpSegment::bumpCoincidentOther(const SkOpSpan& test, int* oIndexPtr, |
| 679 | SkTArray<SkPoint, true>* oOutsidePts) { |
| 680 | int oIndex = *oIndexPtr; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 681 | SkOpSpan* const oTest = &fTs[oIndex]; |
| 682 | SkOpSpan* oEnd = oTest; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 683 | const SkPoint& startPt = test.fPt; |
| 684 | const SkPoint& oStartPt = oTest->fPt; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 685 | double oStartT = oTest->fT; |
| 686 | if (oStartPt == oEnd->fPt || oStartT == oEnd->fT) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 687 | TrackOutside(oOutsidePts, startPt); |
| 688 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 689 | while (oStartPt == oEnd->fPt || oStartT == oEnd->fT) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 690 | zeroSpan(oEnd); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 691 | oEnd = &fTs[++oIndex]; |
| 692 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 693 | *oIndexPtr = oIndex; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | // FIXME: need to test this case: |
| 697 | // contourA has two segments that are coincident |
| 698 | // contourB has two segments that are coincident in the same place |
| 699 | // each ends up with +2/0 pairs for winding count |
| 700 | // since logic below doesn't transfer count (only increments/decrements) can this be |
| 701 | // resolved to +4/0 ? |
| 702 | |
| 703 | // set spans from start to end to increment the greater by one and decrement |
| 704 | // the lesser |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 705 | void SkOpSegment::addTCoincident(const SkPoint& startPt, const SkPoint& endPt, double endT, |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 706 | SkOpSegment* other) { |
| 707 | bool binary = fOperand != other->fOperand; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 708 | int index = 0; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 709 | while (startPt != fTs[index].fPt) { |
| 710 | SkASSERT(index < fTs.count()); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 711 | ++index; |
| 712 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 713 | double startT = fTs[index].fT; |
| 714 | while (index > 0 && fTs[index - 1].fT == startT) { |
| 715 | --index; |
| 716 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 717 | int oIndex = 0; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 718 | while (startPt != other->fTs[oIndex].fPt) { |
| 719 | SkASSERT(oIndex < other->fTs.count()); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 720 | ++oIndex; |
| 721 | } |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 722 | double oStartT = other->fTs[oIndex].fT; |
| 723 | while (oIndex > 0 && other->fTs[oIndex - 1].fT == oStartT) { |
| 724 | --oIndex; |
| 725 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 726 | SkSTArray<kOutsideTrackedTCount, SkPoint, true> outsidePts; |
| 727 | SkSTArray<kOutsideTrackedTCount, SkPoint, true> oOutsidePts; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 728 | SkOpSpan* test = &fTs[index]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 729 | const SkPoint* testPt = &test->fPt; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 730 | double testT = test->fT; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 731 | SkOpSpan* oTest = &other->fTs[oIndex]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 732 | const SkPoint* oTestPt = &oTest->fPt; |
| 733 | SkASSERT(AlmostEqualUlps(*testPt, *oTestPt)); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 734 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 735 | SkASSERT(test->fT < 1); |
| 736 | SkASSERT(oTest->fT < 1); |
| 737 | #if 0 |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 738 | if (test->fDone || oTest->fDone) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 739 | #else // consolidate the winding count even if done |
| 740 | if ((test->fWindValue == 0 && test->fOppValue == 0) |
| 741 | || (oTest->fWindValue == 0 && oTest->fOppValue == 0)) { |
| 742 | #endif |
| 743 | SkDEBUGCODE(int firstWind = test->fWindValue); |
| 744 | SkDEBUGCODE(int firstOpp = test->fOppValue); |
| 745 | do { |
| 746 | SkASSERT(firstWind == fTs[index].fWindValue); |
| 747 | SkASSERT(firstOpp == fTs[index].fOppValue); |
| 748 | ++index; |
| 749 | SkASSERT(index < fTs.count()); |
| 750 | } while (*testPt == fTs[index].fPt); |
| 751 | SkDEBUGCODE(firstWind = oTest->fWindValue); |
| 752 | SkDEBUGCODE(firstOpp = oTest->fOppValue); |
| 753 | do { |
| 754 | SkASSERT(firstWind == other->fTs[oIndex].fWindValue); |
| 755 | SkASSERT(firstOpp == other->fTs[oIndex].fOppValue); |
| 756 | ++oIndex; |
| 757 | SkASSERT(oIndex < other->fTs.count()); |
| 758 | } while (*oTestPt == other->fTs[oIndex].fPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 759 | } else { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 760 | if (!binary || test->fWindValue + oTest->fOppValue >= 0) { |
| 761 | bumpCoincidentThis(*oTest, binary, &index, &outsidePts); |
| 762 | other->bumpCoincidentOther(*test, &oIndex, &oOutsidePts); |
| 763 | } else { |
| 764 | other->bumpCoincidentThis(*test, binary, &oIndex, &oOutsidePts); |
| 765 | bumpCoincidentOther(*oTest, &index, &outsidePts); |
| 766 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 767 | } |
| 768 | test = &fTs[index]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 769 | testPt = &test->fPt; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 770 | testT = test->fT; |
| 771 | if (endPt == *testPt || endT == testT) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 772 | break; |
| 773 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 774 | oTest = &other->fTs[oIndex]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 775 | oTestPt = &oTest->fPt; |
| 776 | SkASSERT(AlmostEqualUlps(*testPt, *oTestPt)); |
| 777 | } while (endPt != *oTestPt); |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 778 | if (endPt != *testPt && endT != testT) { // in rare cases, one may have ended before the other |
| 779 | int lastWind = test[-1].fWindValue; |
| 780 | int lastOpp = test[-1].fOppValue; |
| 781 | bool zero = lastWind == 0 && lastOpp == 0; |
| 782 | do { |
| 783 | if (test->fWindValue || test->fOppValue) { |
| 784 | test->fWindValue = lastWind; |
| 785 | test->fOppValue = lastOpp; |
| 786 | if (zero) { |
| 787 | test->fDone = true; |
| 788 | ++fDoneSpans; |
| 789 | } |
| 790 | } |
| 791 | test = &fTs[++index]; |
| 792 | testPt = &test->fPt; |
| 793 | } while (endPt != *testPt); |
| 794 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 795 | int outCount = outsidePts.count(); |
| 796 | if (!done() && outCount) { |
| 797 | addCoinOutsides(outsidePts[0], endPt, other); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 798 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 799 | if (!other->done() && oOutsidePts.count()) { |
| 800 | other->addCoinOutsides(oOutsidePts[0], endPt, this); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 801 | } |
| 802 | } |
| 803 | |
| 804 | // FIXME: this doesn't prevent the same span from being added twice |
| 805 | // fix in caller, SkASSERT here? |
| 806 | void SkOpSegment::addTPair(double t, SkOpSegment* other, double otherT, bool borrowWind, |
| 807 | const SkPoint& pt) { |
| 808 | int tCount = fTs.count(); |
| 809 | for (int tIndex = 0; tIndex < tCount; ++tIndex) { |
| 810 | const SkOpSpan& span = fTs[tIndex]; |
| 811 | if (!approximately_negative(span.fT - t)) { |
| 812 | break; |
| 813 | } |
| 814 | if (approximately_negative(span.fT - t) && span.fOther == other |
| 815 | && approximately_equal(span.fOtherT, otherT)) { |
| 816 | #if DEBUG_ADD_T_PAIR |
| 817 | SkDebugf("%s addTPair duplicate this=%d %1.9g other=%d %1.9g\n", |
| 818 | __FUNCTION__, fID, t, other->fID, otherT); |
| 819 | #endif |
| 820 | return; |
| 821 | } |
| 822 | } |
| 823 | #if DEBUG_ADD_T_PAIR |
| 824 | SkDebugf("%s addTPair this=%d %1.9g other=%d %1.9g\n", |
| 825 | __FUNCTION__, fID, t, other->fID, otherT); |
| 826 | #endif |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 827 | int insertedAt = addT(other, pt, t); |
| 828 | int otherInsertedAt = other->addT(this, pt, otherT); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 829 | addOtherT(insertedAt, otherT, otherInsertedAt); |
| 830 | other->addOtherT(otherInsertedAt, t, insertedAt); |
| 831 | matchWindingValue(insertedAt, t, borrowWind); |
| 832 | other->matchWindingValue(otherInsertedAt, otherT, borrowWind); |
| 833 | } |
| 834 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 835 | void SkOpSegment::addTwoAngles(int start, int end, SkTArray<SkOpAngle, true>* angles) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 836 | // add edge leading into junction |
| 837 | int min = SkMin32(end, start); |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 838 | if (fTs[min].fWindValue > 0 || fTs[min].fOppValue != 0) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 839 | addAngle(angles, end, start); |
| 840 | } |
| 841 | // add edge leading away from junction |
| 842 | int step = SkSign32(end - start); |
| 843 | int tIndex = nextExactSpan(end, step); |
| 844 | min = SkMin32(end, tIndex); |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 845 | if (tIndex >= 0 && (fTs[min].fWindValue > 0 || fTs[min].fOppValue != 0)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 846 | addAngle(angles, end, tIndex); |
| 847 | } |
| 848 | } |
| 849 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 850 | bool SkOpSegment::betweenPoints(double midT, const SkPoint& pt1, const SkPoint& pt2) const { |
| 851 | const SkPoint midPt = ptAtT(midT); |
| 852 | SkPathOpsBounds bounds; |
| 853 | bounds.set(pt1.fX, pt1.fY, pt2.fX, pt2.fY); |
| 854 | bounds.sort(); |
| 855 | return bounds.almostContains(midPt); |
| 856 | } |
| 857 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 858 | bool SkOpSegment::betweenTs(int lesser, double testT, int greater) const { |
| 859 | if (lesser > greater) { |
| 860 | SkTSwap<int>(lesser, greater); |
| 861 | } |
| 862 | return approximately_between(fTs[lesser].fT, testT, fTs[greater].fT); |
| 863 | } |
| 864 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 865 | // note that this follows the same logic flow as active angle |
| 866 | bool SkOpSegment::buildAngles(int index, SkTArray<SkOpAngle, true>* angles, bool allowOpp) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 867 | double referenceT = fTs[index].fT; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 868 | const SkPoint& referencePt = fTs[index].fPt; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 869 | int lesser = index; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 870 | while (--lesser >= 0 && (allowOpp || fTs[lesser].fOther->fOperand == fOperand) |
| 871 | && (precisely_negative(referenceT - fTs[lesser].fT) || fTs[lesser].fTiny)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 872 | buildAnglesInner(lesser, angles); |
| 873 | } |
| 874 | do { |
| 875 | buildAnglesInner(index, angles); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 876 | if (++index == fTs.count()) { |
| 877 | break; |
| 878 | } |
| 879 | if (!allowOpp && fTs[index].fOther->fOperand != fOperand) { |
| 880 | break; |
| 881 | } |
| 882 | if (fTs[index - 1].fTiny) { |
| 883 | referenceT = fTs[index].fT; |
| 884 | continue; |
| 885 | } |
| 886 | if (!precisely_negative(fTs[index].fT - referenceT) && fTs[index].fPt == referencePt) { |
| 887 | // FIXME |
| 888 | // testQuad8 generates the wrong output unless false is returned here. Other tests will |
| 889 | // take this path although they aren't required to. This means that many go much slower |
| 890 | // because of this sort fail. |
| 891 | // SkDebugf("!!!\n"); |
| 892 | return false; |
| 893 | } |
| 894 | } while (precisely_negative(fTs[index].fT - referenceT)); |
| 895 | return true; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 896 | } |
| 897 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 898 | void SkOpSegment::buildAnglesInner(int index, SkTArray<SkOpAngle, true>* angles) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 899 | const SkOpSpan* span = &fTs[index]; |
| 900 | SkOpSegment* other = span->fOther; |
| 901 | // if there is only one live crossing, and no coincidence, continue |
| 902 | // in the same direction |
| 903 | // if there is coincidence, the only choice may be to reverse direction |
| 904 | // find edge on either side of intersection |
| 905 | int oIndex = span->fOtherIndex; |
| 906 | // if done == -1, prior span has already been processed |
| 907 | int step = 1; |
| 908 | int next = other->nextExactSpan(oIndex, step); |
| 909 | if (next < 0) { |
| 910 | step = -step; |
| 911 | next = other->nextExactSpan(oIndex, step); |
| 912 | } |
| 913 | // add candidate into and away from junction |
| 914 | other->addTwoAngles(next, oIndex, angles); |
| 915 | } |
| 916 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 917 | int SkOpSegment::computeSum(int startIndex, int endIndex, SkOpAngle::IncludeType includeType, |
| 918 | SkTArray<SkOpAngle, true>* angles, SkTArray<SkOpAngle*, true>* sorted) { |
| 919 | addTwoAngles(startIndex, endIndex, angles); |
| 920 | if (!buildAngles(endIndex, angles, includeType == SkOpAngle::kBinaryOpp)) { |
| 921 | return SK_NaN32; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 922 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 923 | int angleCount = angles->count(); |
| 924 | // abort early before sorting if an unsortable (not an unorderable) angle is found |
| 925 | if (includeType != SkOpAngle::kUnaryXor) { |
| 926 | int firstIndex = -1; |
| 927 | while (++firstIndex < angleCount) { |
| 928 | const SkOpAngle& angle = (*angles)[firstIndex]; |
| 929 | if (angle.segment()->windSum(&angle) != SK_MinS32) { |
| 930 | break; |
| 931 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 932 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 933 | if (firstIndex == angleCount) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 934 | return SK_MinS32; |
| 935 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 936 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 937 | bool sortable = SortAngles2(*angles, sorted); |
| 938 | #if DEBUG_SORT_RAW |
| 939 | if (sorted->count() > 0) { |
| 940 | (*sorted)[0]->segment()->debugShowSort(__FUNCTION__, *sorted, 0, 0, 0, sortable); |
| 941 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 942 | #endif |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 943 | if (!sortable) { |
| 944 | return SK_NaN32; |
| 945 | } |
| 946 | if (includeType == SkOpAngle::kUnaryXor) { |
| 947 | return SK_MinS32; |
| 948 | } |
| 949 | // if all angles have a computed winding, |
| 950 | // or if no adjacent angles are orderable, |
| 951 | // or if adjacent orderable angles have no computed winding, |
| 952 | // there's nothing to do |
| 953 | // if two orderable angles are adjacent, and one has winding computed, transfer to the other |
| 954 | const SkOpAngle* baseAngle = NULL; |
| 955 | int last = angleCount; |
| 956 | int finalInitialOrderable = -1; |
| 957 | bool tryReverse = false; |
| 958 | // look for counterclockwise transfers |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 959 | do { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 960 | int index = 0; |
| 961 | do { |
| 962 | SkOpAngle* testAngle = (*sorted)[index]; |
| 963 | int testWinding = testAngle->segment()->windSum(testAngle); |
| 964 | if (SK_MinS32 != testWinding && !testAngle->unorderable()) { |
| 965 | baseAngle = testAngle; |
| 966 | continue; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 967 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 968 | if (testAngle->unorderable()) { |
| 969 | baseAngle = NULL; |
| 970 | tryReverse = true; |
| 971 | continue; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 972 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 973 | if (baseAngle) { |
| 974 | ComputeOneSum(baseAngle, testAngle, includeType); |
| 975 | baseAngle = SK_MinS32 != testAngle->segment()->windSum(testAngle) ? testAngle |
| 976 | : NULL; |
| 977 | tryReverse |= !baseAngle; |
| 978 | continue; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 979 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 980 | if (finalInitialOrderable + 1 == index) { |
| 981 | finalInitialOrderable = index; |
| 982 | } |
| 983 | } while (++index != last); |
| 984 | if (finalInitialOrderable < 0) { |
| 985 | break; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 986 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 987 | last = finalInitialOrderable + 1; |
| 988 | finalInitialOrderable = -2; // make this always negative the second time through |
| 989 | } while (baseAngle); |
| 990 | if (tryReverse) { |
| 991 | baseAngle = NULL; |
| 992 | last = 0; |
| 993 | finalInitialOrderable = angleCount; |
| 994 | do { |
| 995 | int index = angleCount; |
| 996 | while (--index >= last) { |
| 997 | SkOpAngle* testAngle = (*sorted)[index]; |
| 998 | int testWinding = testAngle->segment()->windSum(testAngle); |
| 999 | if (SK_MinS32 != testWinding) { |
| 1000 | baseAngle = testAngle; |
| 1001 | continue; |
| 1002 | } |
| 1003 | if (testAngle->unorderable()) { |
| 1004 | baseAngle = NULL; |
| 1005 | continue; |
| 1006 | } |
| 1007 | if (baseAngle) { |
| 1008 | ComputeOneSumReverse(baseAngle, testAngle, includeType); |
| 1009 | baseAngle = SK_MinS32 != testAngle->segment()->windSum(testAngle) ? testAngle |
| 1010 | : NULL; |
| 1011 | continue; |
| 1012 | } |
| 1013 | if (finalInitialOrderable - 1 == index) { |
| 1014 | finalInitialOrderable = index; |
| 1015 | } |
| 1016 | } |
| 1017 | if (finalInitialOrderable >= angleCount) { |
| 1018 | break; |
| 1019 | } |
| 1020 | last = finalInitialOrderable; |
| 1021 | finalInitialOrderable = angleCount + 1; // make this inactive 2nd time through |
| 1022 | } while (baseAngle); |
| 1023 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1024 | int minIndex = SkMin32(startIndex, endIndex); |
| 1025 | return windSum(minIndex); |
| 1026 | } |
| 1027 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1028 | void SkOpSegment::ComputeOneSum(const SkOpAngle* baseAngle, SkOpAngle* nextAngle, |
| 1029 | SkOpAngle::IncludeType includeType) { |
| 1030 | const SkOpSegment* baseSegment = baseAngle->segment(); |
| 1031 | int sumMiWinding = baseSegment->updateWindingReverse(baseAngle); |
| 1032 | int sumSuWinding; |
| 1033 | bool binary = includeType >= SkOpAngle::kBinarySingle; |
| 1034 | if (binary) { |
| 1035 | sumSuWinding = baseSegment->updateOppWindingReverse(baseAngle); |
| 1036 | if (baseSegment->operand()) { |
| 1037 | SkTSwap<int>(sumMiWinding, sumSuWinding); |
| 1038 | } |
| 1039 | } |
| 1040 | SkOpSegment* nextSegment = nextAngle->segment(); |
| 1041 | int maxWinding, sumWinding; |
| 1042 | SkOpSpan* last; |
| 1043 | if (binary) { |
| 1044 | int oppMaxWinding, oppSumWinding; |
| 1045 | nextSegment->setUpWindings(nextAngle->start(), nextAngle->end(), &sumMiWinding, |
| 1046 | &sumSuWinding, &maxWinding, &sumWinding, &oppMaxWinding, &oppSumWinding); |
| 1047 | last = nextSegment->markAngle(maxWinding, sumWinding, oppMaxWinding, oppSumWinding, |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1048 | nextAngle); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1049 | } else { |
| 1050 | nextSegment->setUpWindings(nextAngle->start(), nextAngle->end(), &sumMiWinding, |
| 1051 | &maxWinding, &sumWinding); |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1052 | last = nextSegment->markAngle(maxWinding, sumWinding, nextAngle); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1053 | } |
| 1054 | nextAngle->setLastMarked(last); |
| 1055 | } |
| 1056 | |
| 1057 | void SkOpSegment::ComputeOneSumReverse(const SkOpAngle* baseAngle, SkOpAngle* nextAngle, |
| 1058 | SkOpAngle::IncludeType includeType) { |
| 1059 | const SkOpSegment* baseSegment = baseAngle->segment(); |
| 1060 | int sumMiWinding = baseSegment->updateWinding(baseAngle); |
| 1061 | int sumSuWinding; |
| 1062 | bool binary = includeType >= SkOpAngle::kBinarySingle; |
| 1063 | if (binary) { |
| 1064 | sumSuWinding = baseSegment->updateOppWinding(baseAngle); |
| 1065 | if (baseSegment->operand()) { |
| 1066 | SkTSwap<int>(sumMiWinding, sumSuWinding); |
| 1067 | } |
| 1068 | } |
| 1069 | SkOpSegment* nextSegment = nextAngle->segment(); |
| 1070 | int maxWinding, sumWinding; |
| 1071 | SkOpSpan* last; |
| 1072 | if (binary) { |
| 1073 | int oppMaxWinding, oppSumWinding; |
| 1074 | nextSegment->setUpWindings(nextAngle->end(), nextAngle->start(), &sumMiWinding, |
| 1075 | &sumSuWinding, &maxWinding, &sumWinding, &oppMaxWinding, &oppSumWinding); |
| 1076 | last = nextSegment->markAngle(maxWinding, sumWinding, oppMaxWinding, oppSumWinding, |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1077 | nextAngle); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1078 | } else { |
| 1079 | nextSegment->setUpWindings(nextAngle->end(), nextAngle->start(), &sumMiWinding, |
| 1080 | &maxWinding, &sumWinding); |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1081 | last = nextSegment->markAngle(maxWinding, sumWinding, nextAngle); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1082 | } |
| 1083 | nextAngle->setLastMarked(last); |
| 1084 | } |
| 1085 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1086 | int SkOpSegment::crossedSpanY(const SkPoint& basePt, SkScalar* bestY, double* hitT, |
| 1087 | bool* hitSomething, double mid, bool opp, bool current) const { |
| 1088 | SkScalar bottom = fBounds.fBottom; |
| 1089 | int bestTIndex = -1; |
| 1090 | if (bottom <= *bestY) { |
| 1091 | return bestTIndex; |
| 1092 | } |
| 1093 | SkScalar top = fBounds.fTop; |
| 1094 | if (top >= basePt.fY) { |
| 1095 | return bestTIndex; |
| 1096 | } |
| 1097 | if (fBounds.fLeft > basePt.fX) { |
| 1098 | return bestTIndex; |
| 1099 | } |
| 1100 | if (fBounds.fRight < basePt.fX) { |
| 1101 | return bestTIndex; |
| 1102 | } |
| 1103 | if (fBounds.fLeft == fBounds.fRight) { |
| 1104 | // if vertical, and directly above test point, wait for another one |
| 1105 | return AlmostEqualUlps(basePt.fX, fBounds.fLeft) ? SK_MinS32 : bestTIndex; |
| 1106 | } |
| 1107 | // intersect ray starting at basePt with edge |
| 1108 | SkIntersections intersections; |
| 1109 | // OPTIMIZE: use specialty function that intersects ray with curve, |
| 1110 | // returning t values only for curve (we don't care about t on ray) |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 1111 | intersections.allowNear(false); |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1112 | int pts = (intersections.*CurveVertical[SkPathOpsVerbToPoints(fVerb)]) |
| 1113 | (fPts, top, bottom, basePt.fX, false); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1114 | if (pts == 0 || (current && pts == 1)) { |
| 1115 | return bestTIndex; |
| 1116 | } |
| 1117 | if (current) { |
| 1118 | SkASSERT(pts > 1); |
| 1119 | int closestIdx = 0; |
| 1120 | double closest = fabs(intersections[0][0] - mid); |
| 1121 | for (int idx = 1; idx < pts; ++idx) { |
| 1122 | double test = fabs(intersections[0][idx] - mid); |
| 1123 | if (closest > test) { |
| 1124 | closestIdx = idx; |
| 1125 | closest = test; |
| 1126 | } |
| 1127 | } |
| 1128 | intersections.quickRemoveOne(closestIdx, --pts); |
| 1129 | } |
| 1130 | double bestT = -1; |
| 1131 | for (int index = 0; index < pts; ++index) { |
| 1132 | double foundT = intersections[0][index]; |
| 1133 | if (approximately_less_than_zero(foundT) |
| 1134 | || approximately_greater_than_one(foundT)) { |
| 1135 | continue; |
| 1136 | } |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 1137 | SkScalar testY = (*CurvePointAtT[SkPathOpsVerbToPoints(fVerb)])(fPts, foundT).fY; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1138 | if (approximately_negative(testY - *bestY) |
| 1139 | || approximately_negative(basePt.fY - testY)) { |
| 1140 | continue; |
| 1141 | } |
| 1142 | if (pts > 1 && fVerb == SkPath::kLine_Verb) { |
| 1143 | return SK_MinS32; // if the intersection is edge on, wait for another one |
| 1144 | } |
| 1145 | if (fVerb > SkPath::kLine_Verb) { |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 1146 | SkScalar dx = (*CurveSlopeAtT[SkPathOpsVerbToPoints(fVerb)])(fPts, foundT).fX; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1147 | if (approximately_zero(dx)) { |
| 1148 | return SK_MinS32; // hit vertical, wait for another one |
| 1149 | } |
| 1150 | } |
| 1151 | *bestY = testY; |
| 1152 | bestT = foundT; |
| 1153 | } |
| 1154 | if (bestT < 0) { |
| 1155 | return bestTIndex; |
| 1156 | } |
| 1157 | SkASSERT(bestT >= 0); |
| 1158 | SkASSERT(bestT <= 1); |
| 1159 | int start; |
| 1160 | int end = 0; |
| 1161 | do { |
| 1162 | start = end; |
| 1163 | end = nextSpan(start, 1); |
| 1164 | } while (fTs[end].fT < bestT); |
| 1165 | // FIXME: see next candidate for a better pattern to find the next start/end pair |
| 1166 | while (start + 1 < end && fTs[start].fDone) { |
| 1167 | ++start; |
| 1168 | } |
| 1169 | if (!isCanceled(start)) { |
| 1170 | *hitT = bestT; |
| 1171 | bestTIndex = start; |
| 1172 | *hitSomething = true; |
| 1173 | } |
| 1174 | return bestTIndex; |
| 1175 | } |
| 1176 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1177 | bool SkOpSegment::decrementSpan(SkOpSpan* span) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1178 | SkASSERT(span->fWindValue > 0); |
| 1179 | if (--(span->fWindValue) == 0) { |
| 1180 | if (!span->fOppValue && !span->fDone) { |
| 1181 | span->fDone = true; |
| 1182 | ++fDoneSpans; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1183 | return true; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1184 | } |
| 1185 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1186 | return false; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1187 | } |
| 1188 | |
| 1189 | bool SkOpSegment::bumpSpan(SkOpSpan* span, int windDelta, int oppDelta) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1190 | SkASSERT(!span->fDone || span->fTiny || span->fSmall); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1191 | span->fWindValue += windDelta; |
| 1192 | SkASSERT(span->fWindValue >= 0); |
| 1193 | span->fOppValue += oppDelta; |
| 1194 | SkASSERT(span->fOppValue >= 0); |
| 1195 | if (fXor) { |
| 1196 | span->fWindValue &= 1; |
| 1197 | } |
| 1198 | if (fOppXor) { |
| 1199 | span->fOppValue &= 1; |
| 1200 | } |
| 1201 | if (!span->fWindValue && !span->fOppValue) { |
| 1202 | span->fDone = true; |
| 1203 | ++fDoneSpans; |
| 1204 | return true; |
| 1205 | } |
| 1206 | return false; |
| 1207 | } |
| 1208 | |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1209 | // look to see if the curve end intersects an intermediary that intersects the other |
| 1210 | void SkOpSegment::checkEnds() { |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1211 | debugValidate(); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1212 | SkSTArray<kMissingSpanCount, MissingSpan, true> missingSpans; |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1213 | int count = fTs.count(); |
| 1214 | for (int index = 0; index < count; ++index) { |
| 1215 | const SkOpSpan& span = fTs[index]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1216 | double otherT = span.fOtherT; |
| 1217 | if (otherT != 0 && otherT != 1) { // only check ends |
| 1218 | continue; |
| 1219 | } |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1220 | const SkOpSegment* other = span.fOther; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1221 | // peek start/last describe the range of spans that match the other t of this span |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1222 | int peekStart = span.fOtherIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1223 | while (--peekStart >= 0 && other->fTs[peekStart].fT == otherT) |
| 1224 | ; |
| 1225 | int otherCount = other->fTs.count(); |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1226 | int peekLast = span.fOtherIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1227 | while (++peekLast < otherCount && other->fTs[peekLast].fT == otherT) |
| 1228 | ; |
| 1229 | if (++peekStart == --peekLast) { // if there isn't a range, there's nothing to do |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1230 | continue; |
| 1231 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1232 | // t start/last describe the range of spans that match the t of this span |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1233 | double t = span.fT; |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 1234 | double tBottom = -1; |
| 1235 | int tStart = -1; |
| 1236 | int tLast = count; |
| 1237 | bool lastSmall = false; |
| 1238 | double afterT = t; |
| 1239 | for (int inner = 0; inner < count; ++inner) { |
| 1240 | double innerT = fTs[inner].fT; |
| 1241 | if (innerT <= t && innerT > tBottom) { |
| 1242 | if (innerT < t || !lastSmall) { |
| 1243 | tStart = inner - 1; |
| 1244 | } |
| 1245 | tBottom = innerT; |
| 1246 | } |
| 1247 | if (innerT > afterT) { |
| 1248 | if (t == afterT && lastSmall) { |
| 1249 | afterT = innerT; |
| 1250 | } else { |
| 1251 | tLast = inner; |
| 1252 | break; |
| 1253 | } |
| 1254 | } |
| 1255 | lastSmall = innerT <= t ? fTs[inner].fSmall : false; |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1256 | } |
| 1257 | for (int peekIndex = peekStart; peekIndex <= peekLast; ++peekIndex) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1258 | if (peekIndex == span.fOtherIndex) { // skip the other span pointed to by this span |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1259 | continue; |
| 1260 | } |
| 1261 | const SkOpSpan& peekSpan = other->fTs[peekIndex]; |
| 1262 | SkOpSegment* match = peekSpan.fOther; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1263 | if (match->done()) { |
| 1264 | continue; // if the edge has already been eaten (likely coincidence), ignore it |
| 1265 | } |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1266 | const double matchT = peekSpan.fOtherT; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1267 | // see if any of the spans match the other spans |
| 1268 | for (int tIndex = tStart + 1; tIndex < tLast; ++tIndex) { |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1269 | const SkOpSpan& tSpan = fTs[tIndex]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1270 | if (tSpan.fOther == match) { |
| 1271 | if (tSpan.fOtherT == matchT) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1272 | goto nextPeekIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1273 | } |
| 1274 | double midT = (tSpan.fOtherT + matchT) / 2; |
| 1275 | if (match->betweenPoints(midT, tSpan.fPt, peekSpan.fPt)) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1276 | goto nextPeekIndex; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1277 | } |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1278 | } |
| 1279 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1280 | if (missingSpans.count() > 0) { |
| 1281 | const MissingSpan& lastMissing = missingSpans.back(); |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1282 | if (lastMissing.fT == t |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1283 | && lastMissing.fOther == match |
| 1284 | && lastMissing.fOtherT == matchT) { |
| 1285 | SkASSERT(lastMissing.fPt == peekSpan.fPt); |
| 1286 | continue; |
| 1287 | } |
| 1288 | } |
| 1289 | #if DEBUG_CHECK_ENDS |
| 1290 | SkDebugf("%s id=%d missing t=%1.9g other=%d otherT=%1.9g pt=(%1.9g,%1.9g)\n", |
| 1291 | __FUNCTION__, fID, t, match->fID, matchT, peekSpan.fPt.fX, peekSpan.fPt.fY); |
| 1292 | #endif |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1293 | // this segment is missing a entry that the other contains |
| 1294 | // remember so we can add the missing one and recompute the indices |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1295 | { |
| 1296 | MissingSpan& missing = missingSpans.push_back(); |
| 1297 | SkDEBUGCODE(sk_bzero(&missing, sizeof(missing))); |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1298 | missing.fT = t; |
| 1299 | missing.fOther = match; |
| 1300 | missing.fOtherT = matchT; |
| 1301 | missing.fPt = peekSpan.fPt; |
| 1302 | } |
| 1303 | break; |
| 1304 | nextPeekIndex: |
| 1305 | ; |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1306 | } |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1307 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1308 | if (missingSpans.count() == 0) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1309 | debugValidate(); |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1310 | return; |
| 1311 | } |
| 1312 | debugValidate(); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1313 | int missingCount = missingSpans.count(); |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1314 | for (int index = 0; index < missingCount; ++index) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1315 | MissingSpan& missing = missingSpans[index]; |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1316 | addTPair(missing.fT, missing.fOther, missing.fOtherT, false, missing.fPt); |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1317 | } |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1318 | fixOtherTIndex(); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1319 | // OPTIMIZATION: this may fix indices more than once. Build an array of unique segments to |
| 1320 | // avoid this |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1321 | for (int index = 0; index < missingCount; ++index) { |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 1322 | missingSpans[index].fOther->fixOtherTIndex(); |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1323 | } |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1324 | debugValidate(); |
caryclark@google.com | fa2aeee | 2013-07-15 13:29:13 +0000 | [diff] [blame] | 1325 | } |
| 1326 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1327 | bool SkOpSegment::checkSmall(int index) const { |
| 1328 | if (fTs[index].fSmall) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1329 | return true; |
| 1330 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1331 | double tBase = fTs[index].fT; |
| 1332 | while (index > 0 && precisely_negative(tBase - fTs[--index].fT)) |
| 1333 | ; |
| 1334 | return fTs[index].fSmall; |
| 1335 | } |
| 1336 | |
| 1337 | // if pair of spans on either side of tiny have the same end point and mid point, mark |
| 1338 | // them as parallel |
| 1339 | // OPTIMIZATION : mark the segment to note that some span is tiny |
| 1340 | void SkOpSegment::checkTiny() { |
| 1341 | SkSTArray<kMissingSpanCount, MissingSpan, true> missingSpans; |
| 1342 | SkOpSpan* thisSpan = fTs.begin() - 1; |
| 1343 | const SkOpSpan* endSpan = fTs.end() - 1; // last can't be tiny |
| 1344 | while (++thisSpan < endSpan) { |
| 1345 | if (!thisSpan->fTiny) { |
| 1346 | continue; |
| 1347 | } |
| 1348 | SkOpSpan* nextSpan = thisSpan + 1; |
| 1349 | double thisT = thisSpan->fT; |
| 1350 | double nextT = nextSpan->fT; |
| 1351 | if (thisT == nextT) { |
| 1352 | continue; |
| 1353 | } |
| 1354 | SkASSERT(thisT < nextT); |
| 1355 | SkASSERT(thisSpan->fPt == nextSpan->fPt); |
| 1356 | SkOpSegment* thisOther = thisSpan->fOther; |
| 1357 | SkOpSegment* nextOther = nextSpan->fOther; |
| 1358 | int oIndex = thisSpan->fOtherIndex; |
| 1359 | for (int oStep = -1; oStep <= 1; oStep += 2) { |
| 1360 | int oEnd = thisOther->nextExactSpan(oIndex, oStep); |
| 1361 | if (oEnd < 0) { |
| 1362 | continue; |
| 1363 | } |
| 1364 | const SkOpSpan& oSpan = thisOther->span(oEnd); |
| 1365 | int nIndex = nextSpan->fOtherIndex; |
| 1366 | for (int nStep = -1; nStep <= 1; nStep += 2) { |
| 1367 | int nEnd = nextOther->nextExactSpan(nIndex, nStep); |
| 1368 | if (nEnd < 0) { |
| 1369 | continue; |
| 1370 | } |
| 1371 | const SkOpSpan& nSpan = nextOther->span(nEnd); |
| 1372 | if (oSpan.fPt != nSpan.fPt) { |
| 1373 | continue; |
| 1374 | } |
| 1375 | double oMidT = (thisSpan->fOtherT + oSpan.fT) / 2; |
| 1376 | const SkPoint& oPt = thisOther->ptAtT(oMidT); |
| 1377 | double nMidT = (nextSpan->fOtherT + nSpan.fT) / 2; |
| 1378 | const SkPoint& nPt = nextOther->ptAtT(nMidT); |
| 1379 | if (!AlmostEqualUlps(oPt, nPt)) { |
| 1380 | continue; |
| 1381 | } |
| 1382 | #if DEBUG_CHECK_TINY |
| 1383 | SkDebugf("%s [%d] add coincidence [%d] [%d]\n", __FUNCTION__, fID, |
| 1384 | thisOther->fID, nextOther->fID); |
| 1385 | #endif |
| 1386 | // this segment is missing a entry that the other contains |
| 1387 | // remember so we can add the missing one and recompute the indices |
| 1388 | MissingSpan& missing = missingSpans.push_back(); |
| 1389 | SkDEBUGCODE(sk_bzero(&missing, sizeof(missing))); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1390 | missing.fSegment = thisOther; |
| 1391 | missing.fT = thisSpan->fOtherT; |
| 1392 | missing.fOther = nextOther; |
| 1393 | missing.fOtherT = nextSpan->fOtherT; |
| 1394 | missing.fPt = thisSpan->fPt; |
| 1395 | } |
| 1396 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1397 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1398 | int missingCount = missingSpans.count(); |
| 1399 | if (!missingCount) { |
| 1400 | return; |
| 1401 | } |
| 1402 | for (int index = 0; index < missingCount; ++index) { |
| 1403 | MissingSpan& missing = missingSpans[index]; |
| 1404 | missing.fSegment->addTPair(missing.fT, missing.fOther, missing.fOtherT, false, missing.fPt); |
| 1405 | } |
| 1406 | for (int index = 0; index < missingCount; ++index) { |
| 1407 | MissingSpan& missing = missingSpans[index]; |
| 1408 | missing.fSegment->fixOtherTIndex(); |
| 1409 | missing.fOther->fixOtherTIndex(); |
| 1410 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1411 | } |
| 1412 | |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 1413 | bool SkOpSegment::findCoincidentMatch(const SkOpSpan* span, const SkOpSegment* other, int oStart, |
| 1414 | int oEnd, int step, SkPoint* startPt, SkPoint* endPt, double* endT) const { |
| 1415 | SkASSERT(span->fT == 0 || span->fT == 1); |
| 1416 | SkASSERT(span->fOtherT == 0 || span->fOtherT == 1); |
| 1417 | const SkOpSpan* otherSpan = &other->span(oEnd); |
| 1418 | double refT = otherSpan->fT; |
| 1419 | const SkPoint& refPt = otherSpan->fPt; |
| 1420 | const SkOpSpan* lastSpan = &other->span(step > 0 ? other->count() - 1 : 0); |
| 1421 | do { |
| 1422 | const SkOpSegment* match = span->fOther; |
| 1423 | if (match == otherSpan->fOther) { |
| 1424 | // find start of respective spans and see if both have winding |
| 1425 | int startIndex, endIndex; |
| 1426 | if (span->fOtherT == 1) { |
| 1427 | endIndex = span->fOtherIndex; |
| 1428 | startIndex = match->nextExactSpan(endIndex, -1); |
| 1429 | } else { |
| 1430 | startIndex = span->fOtherIndex; |
| 1431 | endIndex = match->nextExactSpan(startIndex, 1); |
| 1432 | } |
| 1433 | const SkOpSpan& startSpan = match->span(startIndex); |
| 1434 | if (startSpan.fWindValue != 0) { |
| 1435 | // draw ray from endSpan.fPt perpendicular to end tangent and measure distance |
| 1436 | // to other segment. |
| 1437 | const SkOpSpan& endSpan = match->span(endIndex); |
| 1438 | SkDLine ray; |
| 1439 | SkVector dxdy; |
| 1440 | if (span->fOtherT == 1) { |
| 1441 | ray.fPts[0].set(startSpan.fPt); |
| 1442 | dxdy = match->dxdy(startIndex); |
| 1443 | } else { |
| 1444 | ray.fPts[0].set(endSpan.fPt); |
| 1445 | dxdy = match->dxdy(endIndex); |
| 1446 | } |
| 1447 | ray.fPts[1].fX = ray.fPts[0].fX + dxdy.fY; |
| 1448 | ray.fPts[1].fY = ray.fPts[0].fY - dxdy.fX; |
| 1449 | SkIntersections i; |
| 1450 | int roots = (i.*CurveRay[SkPathOpsVerbToPoints(other->verb())])(other->pts(), ray); |
| 1451 | for (int index = 0; index < roots; ++index) { |
| 1452 | if (ray.fPts[0].approximatelyEqual(i.pt(index))) { |
| 1453 | double matchMidT = (match->span(startIndex).fT |
| 1454 | + match->span(endIndex).fT) / 2; |
| 1455 | SkPoint matchMidPt = match->ptAtT(matchMidT); |
| 1456 | double otherMidT = (i[0][index] + other->span(oStart).fT) / 2; |
| 1457 | SkPoint otherMidPt = other->ptAtT(otherMidT); |
| 1458 | if (SkDPoint::ApproximatelyEqual(matchMidPt, otherMidPt)) { |
| 1459 | *startPt = startSpan.fPt; |
| 1460 | *endPt = endSpan.fPt; |
| 1461 | *endT = endSpan.fT; |
| 1462 | return true; |
| 1463 | } |
| 1464 | } |
| 1465 | } |
| 1466 | } |
| 1467 | return false; |
| 1468 | } |
| 1469 | if (otherSpan == lastSpan) { |
| 1470 | break; |
| 1471 | } |
| 1472 | otherSpan += step; |
| 1473 | } while (otherSpan->fT == refT || otherSpan->fPt == refPt); |
| 1474 | return false; |
| 1475 | } |
| 1476 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1477 | /* |
| 1478 | The M and S variable name parts stand for the operators. |
| 1479 | Mi stands for Minuend (see wiki subtraction, analogous to difference) |
| 1480 | Su stands for Subtrahend |
| 1481 | The Opp variable name part designates that the value is for the Opposite operator. |
| 1482 | Opposite values result from combining coincident spans. |
| 1483 | */ |
| 1484 | SkOpSegment* SkOpSegment::findNextOp(SkTDArray<SkOpSpan*>* chase, int* nextStart, int* nextEnd, |
| 1485 | bool* unsortable, SkPathOp op, const int xorMiMask, |
| 1486 | const int xorSuMask) { |
| 1487 | const int startIndex = *nextStart; |
| 1488 | const int endIndex = *nextEnd; |
| 1489 | SkASSERT(startIndex != endIndex); |
| 1490 | SkDEBUGCODE(const int count = fTs.count()); |
| 1491 | SkASSERT(startIndex < endIndex ? startIndex < count - 1 : startIndex > 0); |
| 1492 | const int step = SkSign32(endIndex - startIndex); |
| 1493 | const int end = nextExactSpan(startIndex, step); |
| 1494 | SkASSERT(end >= 0); |
| 1495 | SkOpSpan* endSpan = &fTs[end]; |
| 1496 | SkOpSegment* other; |
| 1497 | if (isSimple(end)) { |
| 1498 | // mark the smaller of startIndex, endIndex done, and all adjacent |
| 1499 | // spans with the same T value (but not 'other' spans) |
| 1500 | #if DEBUG_WINDING |
| 1501 | SkDebugf("%s simple\n", __FUNCTION__); |
| 1502 | #endif |
| 1503 | int min = SkMin32(startIndex, endIndex); |
| 1504 | if (fTs[min].fDone) { |
| 1505 | return NULL; |
| 1506 | } |
| 1507 | markDoneBinary(min); |
| 1508 | other = endSpan->fOther; |
| 1509 | *nextStart = endSpan->fOtherIndex; |
| 1510 | double startT = other->fTs[*nextStart].fT; |
| 1511 | *nextEnd = *nextStart; |
| 1512 | do { |
| 1513 | *nextEnd += step; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1514 | } while (precisely_zero(startT - other->fTs[*nextEnd].fT)); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1515 | SkASSERT(step < 0 ? *nextEnd >= 0 : *nextEnd < other->fTs.count()); |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1516 | if (other->isTiny(SkMin32(*nextStart, *nextEnd))) { |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 1517 | *unsortable = true; |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1518 | return NULL; |
| 1519 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1520 | return other; |
| 1521 | } |
| 1522 | // more than one viable candidate -- measure angles to find best |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1523 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle, true> angles; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1524 | SkASSERT(startIndex - endIndex != 0); |
| 1525 | SkASSERT((startIndex - endIndex < 0) ^ (step < 0)); |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1526 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle*, true> sorted; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1527 | int calcWinding = computeSum(startIndex, end, SkOpAngle::kBinaryOpp, &angles, &sorted); |
| 1528 | bool sortable = calcWinding != SK_NaN32; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 1529 | if (sortable && sorted.count() == 0) { |
| 1530 | // if no edge has a computed winding sum, we can go no further |
| 1531 | *unsortable = true; |
| 1532 | return NULL; |
| 1533 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1534 | int angleCount = angles.count(); |
| 1535 | int firstIndex = findStartingEdge(sorted, startIndex, end); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1536 | SkASSERT(!sortable || firstIndex >= 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1537 | #if DEBUG_SORT |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 1538 | debugShowSort(__FUNCTION__, sorted, firstIndex, sortable); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1539 | #endif |
| 1540 | if (!sortable) { |
| 1541 | *unsortable = true; |
| 1542 | return NULL; |
| 1543 | } |
| 1544 | SkASSERT(sorted[firstIndex]->segment() == this); |
| 1545 | #if DEBUG_WINDING |
| 1546 | SkDebugf("%s firstIndex=[%d] sign=%d\n", __FUNCTION__, firstIndex, |
| 1547 | sorted[firstIndex]->sign()); |
| 1548 | #endif |
| 1549 | int sumMiWinding = updateWinding(endIndex, startIndex); |
| 1550 | int sumSuWinding = updateOppWinding(endIndex, startIndex); |
| 1551 | if (operand()) { |
| 1552 | SkTSwap<int>(sumMiWinding, sumSuWinding); |
| 1553 | } |
| 1554 | int nextIndex = firstIndex + 1; |
| 1555 | int lastIndex = firstIndex != 0 ? firstIndex : angleCount; |
| 1556 | const SkOpAngle* foundAngle = NULL; |
| 1557 | bool foundDone = false; |
| 1558 | // iterate through the angle, and compute everyone's winding |
| 1559 | SkOpSegment* nextSegment; |
| 1560 | int activeCount = 0; |
| 1561 | do { |
| 1562 | SkASSERT(nextIndex != firstIndex); |
| 1563 | if (nextIndex == angleCount) { |
| 1564 | nextIndex = 0; |
| 1565 | } |
| 1566 | const SkOpAngle* nextAngle = sorted[nextIndex]; |
| 1567 | nextSegment = nextAngle->segment(); |
| 1568 | int maxWinding, sumWinding, oppMaxWinding, oppSumWinding; |
| 1569 | bool activeAngle = nextSegment->activeOp(xorMiMask, xorSuMask, nextAngle->start(), |
| 1570 | nextAngle->end(), op, &sumMiWinding, &sumSuWinding, |
| 1571 | &maxWinding, &sumWinding, &oppMaxWinding, &oppSumWinding); |
| 1572 | if (activeAngle) { |
| 1573 | ++activeCount; |
| 1574 | if (!foundAngle || (foundDone && activeCount & 1)) { |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1575 | if (nextSegment->isTiny(nextAngle)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1576 | *unsortable = true; |
| 1577 | return NULL; |
| 1578 | } |
| 1579 | foundAngle = nextAngle; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1580 | foundDone = nextSegment->done(nextAngle); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1581 | } |
| 1582 | } |
| 1583 | if (nextSegment->done()) { |
| 1584 | continue; |
| 1585 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1586 | if (nextSegment->isTiny(nextAngle)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1587 | continue; |
| 1588 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1589 | if (!activeAngle) { |
| 1590 | nextSegment->markAndChaseDoneBinary(nextAngle->start(), nextAngle->end()); |
| 1591 | } |
| 1592 | SkOpSpan* last = nextAngle->lastMarked(); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1593 | if (last) { |
| 1594 | *chase->append() = last; |
| 1595 | #if DEBUG_WINDING |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1596 | SkDebugf("%s chase.append id=%d windSum=%d small=%d\n", __FUNCTION__, |
| 1597 | last->fOther->fTs[last->fOtherIndex].fOther->debugID(), last->fWindSum, |
| 1598 | last->fSmall); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1599 | #endif |
| 1600 | } |
| 1601 | } while (++nextIndex != lastIndex); |
| 1602 | markDoneBinary(SkMin32(startIndex, endIndex)); |
| 1603 | if (!foundAngle) { |
| 1604 | return NULL; |
| 1605 | } |
| 1606 | *nextStart = foundAngle->start(); |
| 1607 | *nextEnd = foundAngle->end(); |
| 1608 | nextSegment = foundAngle->segment(); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1609 | #if DEBUG_WINDING |
| 1610 | SkDebugf("%s from:[%d] to:[%d] start=%d end=%d\n", |
| 1611 | __FUNCTION__, debugID(), nextSegment->debugID(), *nextStart, *nextEnd); |
| 1612 | #endif |
| 1613 | return nextSegment; |
| 1614 | } |
| 1615 | |
| 1616 | SkOpSegment* SkOpSegment::findNextWinding(SkTDArray<SkOpSpan*>* chase, int* nextStart, |
| 1617 | int* nextEnd, bool* unsortable) { |
| 1618 | const int startIndex = *nextStart; |
| 1619 | const int endIndex = *nextEnd; |
| 1620 | SkASSERT(startIndex != endIndex); |
| 1621 | SkDEBUGCODE(const int count = fTs.count()); |
| 1622 | SkASSERT(startIndex < endIndex ? startIndex < count - 1 : startIndex > 0); |
| 1623 | const int step = SkSign32(endIndex - startIndex); |
| 1624 | const int end = nextExactSpan(startIndex, step); |
| 1625 | SkASSERT(end >= 0); |
| 1626 | SkOpSpan* endSpan = &fTs[end]; |
| 1627 | SkOpSegment* other; |
| 1628 | if (isSimple(end)) { |
| 1629 | // mark the smaller of startIndex, endIndex done, and all adjacent |
| 1630 | // spans with the same T value (but not 'other' spans) |
| 1631 | #if DEBUG_WINDING |
| 1632 | SkDebugf("%s simple\n", __FUNCTION__); |
| 1633 | #endif |
| 1634 | int min = SkMin32(startIndex, endIndex); |
| 1635 | if (fTs[min].fDone) { |
| 1636 | return NULL; |
| 1637 | } |
| 1638 | markDoneUnary(min); |
| 1639 | other = endSpan->fOther; |
| 1640 | *nextStart = endSpan->fOtherIndex; |
| 1641 | double startT = other->fTs[*nextStart].fT; |
| 1642 | *nextEnd = *nextStart; |
| 1643 | do { |
| 1644 | *nextEnd += step; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1645 | } while (precisely_zero(startT - other->fTs[*nextEnd].fT)); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1646 | SkASSERT(step < 0 ? *nextEnd >= 0 : *nextEnd < other->fTs.count()); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1647 | if (other->isTiny(SkMin32(*nextStart, *nextEnd))) { |
| 1648 | *unsortable = true; |
| 1649 | return NULL; |
| 1650 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1651 | return other; |
| 1652 | } |
| 1653 | // more than one viable candidate -- measure angles to find best |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1654 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle, true> angles; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1655 | SkASSERT(startIndex - endIndex != 0); |
| 1656 | SkASSERT((startIndex - endIndex < 0) ^ (step < 0)); |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1657 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle*, true> sorted; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1658 | int calcWinding = computeSum(startIndex, end, SkOpAngle::kUnaryWinding, &angles, &sorted); |
| 1659 | bool sortable = calcWinding != SK_NaN32; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1660 | int angleCount = angles.count(); |
| 1661 | int firstIndex = findStartingEdge(sorted, startIndex, end); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1662 | SkASSERT(!sortable || firstIndex >= 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1663 | #if DEBUG_SORT |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 1664 | debugShowSort(__FUNCTION__, sorted, firstIndex, sortable); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1665 | #endif |
| 1666 | if (!sortable) { |
| 1667 | *unsortable = true; |
| 1668 | return NULL; |
| 1669 | } |
| 1670 | SkASSERT(sorted[firstIndex]->segment() == this); |
| 1671 | #if DEBUG_WINDING |
| 1672 | SkDebugf("%s firstIndex=[%d] sign=%d\n", __FUNCTION__, firstIndex, |
| 1673 | sorted[firstIndex]->sign()); |
| 1674 | #endif |
| 1675 | int sumWinding = updateWinding(endIndex, startIndex); |
| 1676 | int nextIndex = firstIndex + 1; |
| 1677 | int lastIndex = firstIndex != 0 ? firstIndex : angleCount; |
| 1678 | const SkOpAngle* foundAngle = NULL; |
| 1679 | bool foundDone = false; |
| 1680 | // iterate through the angle, and compute everyone's winding |
| 1681 | SkOpSegment* nextSegment; |
| 1682 | int activeCount = 0; |
| 1683 | do { |
| 1684 | SkASSERT(nextIndex != firstIndex); |
| 1685 | if (nextIndex == angleCount) { |
| 1686 | nextIndex = 0; |
| 1687 | } |
| 1688 | const SkOpAngle* nextAngle = sorted[nextIndex]; |
| 1689 | nextSegment = nextAngle->segment(); |
| 1690 | int maxWinding; |
| 1691 | bool activeAngle = nextSegment->activeWinding(nextAngle->start(), nextAngle->end(), |
| 1692 | &maxWinding, &sumWinding); |
| 1693 | if (activeAngle) { |
| 1694 | ++activeCount; |
| 1695 | if (!foundAngle || (foundDone && activeCount & 1)) { |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1696 | if (nextSegment->isTiny(nextAngle)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1697 | *unsortable = true; |
| 1698 | return NULL; |
| 1699 | } |
| 1700 | foundAngle = nextAngle; |
| 1701 | foundDone = nextSegment->done(nextAngle); |
| 1702 | } |
| 1703 | } |
| 1704 | if (nextSegment->done()) { |
| 1705 | continue; |
| 1706 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1707 | if (nextSegment->isTiny(nextAngle)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1708 | continue; |
| 1709 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1710 | if (!activeAngle) { |
| 1711 | nextSegment->markAndChaseDoneUnary(nextAngle->start(), nextAngle->end()); |
| 1712 | } |
| 1713 | SkOpSpan* last = nextAngle->lastMarked(); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1714 | if (last) { |
| 1715 | *chase->append() = last; |
| 1716 | #if DEBUG_WINDING |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1717 | SkDebugf("%s chase.append id=%d windSum=%d small=%d\n", __FUNCTION__, |
| 1718 | last->fOther->fTs[last->fOtherIndex].fOther->debugID(), last->fWindSum, |
| 1719 | last->fSmall); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1720 | #endif |
| 1721 | } |
| 1722 | } while (++nextIndex != lastIndex); |
| 1723 | markDoneUnary(SkMin32(startIndex, endIndex)); |
| 1724 | if (!foundAngle) { |
| 1725 | return NULL; |
| 1726 | } |
| 1727 | *nextStart = foundAngle->start(); |
| 1728 | *nextEnd = foundAngle->end(); |
| 1729 | nextSegment = foundAngle->segment(); |
| 1730 | #if DEBUG_WINDING |
| 1731 | SkDebugf("%s from:[%d] to:[%d] start=%d end=%d\n", |
| 1732 | __FUNCTION__, debugID(), nextSegment->debugID(), *nextStart, *nextEnd); |
| 1733 | #endif |
| 1734 | return nextSegment; |
| 1735 | } |
| 1736 | |
| 1737 | SkOpSegment* SkOpSegment::findNextXor(int* nextStart, int* nextEnd, bool* unsortable) { |
| 1738 | const int startIndex = *nextStart; |
| 1739 | const int endIndex = *nextEnd; |
| 1740 | SkASSERT(startIndex != endIndex); |
| 1741 | SkDEBUGCODE(int count = fTs.count()); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1742 | SkASSERT(startIndex < endIndex ? startIndex < count - 1 : startIndex > 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1743 | int step = SkSign32(endIndex - startIndex); |
| 1744 | int end = nextExactSpan(startIndex, step); |
| 1745 | SkASSERT(end >= 0); |
| 1746 | SkOpSpan* endSpan = &fTs[end]; |
| 1747 | SkOpSegment* other; |
| 1748 | if (isSimple(end)) { |
| 1749 | #if DEBUG_WINDING |
| 1750 | SkDebugf("%s simple\n", __FUNCTION__); |
| 1751 | #endif |
| 1752 | int min = SkMin32(startIndex, endIndex); |
| 1753 | if (fTs[min].fDone) { |
| 1754 | return NULL; |
| 1755 | } |
| 1756 | markDone(min, 1); |
| 1757 | other = endSpan->fOther; |
| 1758 | *nextStart = endSpan->fOtherIndex; |
| 1759 | double startT = other->fTs[*nextStart].fT; |
| 1760 | // FIXME: I don't know why the logic here is difference from the winding case |
| 1761 | SkDEBUGCODE(bool firstLoop = true;) |
| 1762 | if ((approximately_less_than_zero(startT) && step < 0) |
| 1763 | || (approximately_greater_than_one(startT) && step > 0)) { |
| 1764 | step = -step; |
| 1765 | SkDEBUGCODE(firstLoop = false;) |
| 1766 | } |
| 1767 | do { |
| 1768 | *nextEnd = *nextStart; |
| 1769 | do { |
| 1770 | *nextEnd += step; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1771 | } while (precisely_zero(startT - other->fTs[*nextEnd].fT)); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1772 | if (other->fTs[SkMin32(*nextStart, *nextEnd)].fWindValue) { |
| 1773 | break; |
| 1774 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1775 | SkASSERT(firstLoop); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1776 | SkDEBUGCODE(firstLoop = false;) |
| 1777 | step = -step; |
| 1778 | } while (true); |
| 1779 | SkASSERT(step < 0 ? *nextEnd >= 0 : *nextEnd < other->fTs.count()); |
| 1780 | return other; |
| 1781 | } |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1782 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle, true> angles; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1783 | SkASSERT(startIndex - endIndex != 0); |
| 1784 | SkASSERT((startIndex - endIndex < 0) ^ (step < 0)); |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1785 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle*, true> sorted; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1786 | int calcWinding = computeSum(startIndex, end, SkOpAngle::kUnaryXor, &angles, &sorted); |
| 1787 | bool sortable = calcWinding != SK_NaN32; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1788 | int angleCount = angles.count(); |
| 1789 | int firstIndex = findStartingEdge(sorted, startIndex, end); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1790 | SkASSERT(!sortable || firstIndex >= 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1791 | #if DEBUG_SORT |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 1792 | debugShowSort(__FUNCTION__, sorted, firstIndex, 0, 0, sortable); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1793 | #endif |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1794 | if (!sortable) { |
| 1795 | *unsortable = true; |
| 1796 | return NULL; |
| 1797 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1798 | SkASSERT(sorted[firstIndex]->segment() == this); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1799 | #if DEBUG_WINDING |
| 1800 | SkDebugf("%s firstIndex=[%d] sign=%d\n", __FUNCTION__, firstIndex, |
| 1801 | sorted[firstIndex]->sign()); |
| 1802 | #endif |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1803 | int nextIndex = firstIndex + 1; |
| 1804 | int lastIndex = firstIndex != 0 ? firstIndex : angleCount; |
| 1805 | const SkOpAngle* foundAngle = NULL; |
| 1806 | bool foundDone = false; |
| 1807 | SkOpSegment* nextSegment; |
| 1808 | int activeCount = 0; |
| 1809 | do { |
| 1810 | SkASSERT(nextIndex != firstIndex); |
| 1811 | if (nextIndex == angleCount) { |
| 1812 | nextIndex = 0; |
| 1813 | } |
| 1814 | const SkOpAngle* nextAngle = sorted[nextIndex]; |
| 1815 | nextSegment = nextAngle->segment(); |
| 1816 | ++activeCount; |
| 1817 | if (!foundAngle || (foundDone && activeCount & 1)) { |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1818 | if (nextSegment->isTiny(nextAngle)) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1819 | *unsortable = true; |
| 1820 | return NULL; |
| 1821 | } |
| 1822 | foundAngle = nextAngle; |
| 1823 | foundDone = nextSegment->done(nextAngle); |
| 1824 | } |
| 1825 | if (nextSegment->done()) { |
| 1826 | continue; |
| 1827 | } |
| 1828 | } while (++nextIndex != lastIndex); |
| 1829 | markDone(SkMin32(startIndex, endIndex), 1); |
| 1830 | if (!foundAngle) { |
| 1831 | return NULL; |
| 1832 | } |
| 1833 | *nextStart = foundAngle->start(); |
| 1834 | *nextEnd = foundAngle->end(); |
| 1835 | nextSegment = foundAngle->segment(); |
| 1836 | #if DEBUG_WINDING |
| 1837 | SkDebugf("%s from:[%d] to:[%d] start=%d end=%d\n", |
| 1838 | __FUNCTION__, debugID(), nextSegment->debugID(), *nextStart, *nextEnd); |
| 1839 | #endif |
| 1840 | return nextSegment; |
| 1841 | } |
| 1842 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1843 | int SkOpSegment::findStartingEdge(const SkTArray<SkOpAngle*, true>& sorted, int start, int end) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1844 | int angleCount = sorted.count(); |
| 1845 | int firstIndex = -1; |
| 1846 | for (int angleIndex = 0; angleIndex < angleCount; ++angleIndex) { |
| 1847 | const SkOpAngle* angle = sorted[angleIndex]; |
| 1848 | if (angle->segment() == this && angle->start() == end && |
| 1849 | angle->end() == start) { |
| 1850 | firstIndex = angleIndex; |
| 1851 | break; |
| 1852 | } |
| 1853 | } |
| 1854 | return firstIndex; |
| 1855 | } |
| 1856 | |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 1857 | int SkOpSegment::findT(double t, const SkOpSegment* match) const { |
| 1858 | int count = this->count(); |
| 1859 | for (int index = 0; index < count; ++index) { |
| 1860 | const SkOpSpan& span = fTs[index]; |
| 1861 | if (span.fT == t && span.fOther == match) { |
| 1862 | return index; |
| 1863 | } |
| 1864 | } |
| 1865 | SkASSERT(0); |
| 1866 | return -1; |
| 1867 | } |
| 1868 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1869 | // FIXME: either: |
| 1870 | // a) mark spans with either end unsortable as done, or |
| 1871 | // b) rewrite findTop / findTopSegment / findTopContour to iterate further |
| 1872 | // when encountering an unsortable span |
| 1873 | |
| 1874 | // OPTIMIZATION : for a pair of lines, can we compute points at T (cached) |
| 1875 | // and use more concise logic like the old edge walker code? |
| 1876 | // FIXME: this needs to deal with coincident edges |
| 1877 | SkOpSegment* SkOpSegment::findTop(int* tIndexPtr, int* endIndexPtr, bool* unsortable, |
| 1878 | bool onlySortable) { |
| 1879 | // iterate through T intersections and return topmost |
| 1880 | // topmost tangent from y-min to first pt is closer to horizontal |
| 1881 | SkASSERT(!done()); |
| 1882 | int firstT = -1; |
| 1883 | /* SkPoint topPt = */ activeLeftTop(onlySortable, &firstT); |
| 1884 | if (firstT < 0) { |
| 1885 | *unsortable = true; |
| 1886 | firstT = 0; |
| 1887 | while (fTs[firstT].fDone) { |
| 1888 | SkASSERT(firstT < fTs.count()); |
| 1889 | ++firstT; |
| 1890 | } |
| 1891 | *tIndexPtr = firstT; |
| 1892 | *endIndexPtr = nextExactSpan(firstT, 1); |
| 1893 | return this; |
| 1894 | } |
| 1895 | // sort the edges to find the leftmost |
| 1896 | int step = 1; |
| 1897 | int end = nextSpan(firstT, step); |
| 1898 | if (end == -1) { |
| 1899 | step = -1; |
| 1900 | end = nextSpan(firstT, step); |
| 1901 | SkASSERT(end != -1); |
| 1902 | } |
| 1903 | // if the topmost T is not on end, or is three-way or more, find left |
| 1904 | // look for left-ness from tLeft to firstT (matching y of other) |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1905 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle, true> angles; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1906 | SkASSERT(firstT - end != 0); |
| 1907 | addTwoAngles(end, firstT, &angles); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1908 | if (!buildAngles(firstT, &angles, true) && onlySortable) { |
| 1909 | // *unsortable = true; |
| 1910 | // return NULL; |
| 1911 | } |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 1912 | SkSTArray<SkOpAngle::kStackBasedCount, SkOpAngle*, true> sorted; |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 1913 | bool sortable = SortAngles(angles, &sorted, SkOpSegment::kMayBeUnordered_SortAngleKind); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1914 | if (onlySortable && !sortable) { |
| 1915 | *unsortable = true; |
| 1916 | return NULL; |
| 1917 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1918 | int first = SK_MaxS32; |
| 1919 | SkScalar top = SK_ScalarMax; |
| 1920 | int count = sorted.count(); |
| 1921 | for (int index = 0; index < count; ++index) { |
| 1922 | const SkOpAngle* angle = sorted[index]; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1923 | if (onlySortable && angle->unorderable()) { |
| 1924 | continue; |
| 1925 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1926 | SkOpSegment* next = angle->segment(); |
| 1927 | SkPathOpsBounds bounds; |
| 1928 | next->subDivideBounds(angle->end(), angle->start(), &bounds); |
| 1929 | if (approximately_greater(top, bounds.fTop)) { |
| 1930 | top = bounds.fTop; |
| 1931 | first = index; |
| 1932 | } |
| 1933 | } |
| 1934 | SkASSERT(first < SK_MaxS32); |
| 1935 | #if DEBUG_SORT // || DEBUG_SWAP_TOP |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 1936 | sorted[first]->segment()->debugShowSort(__FUNCTION__, sorted, first, 0, 0, sortable); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1937 | #endif |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1938 | // skip edges that have already been processed |
| 1939 | firstT = first - 1; |
| 1940 | SkOpSegment* leftSegment; |
| 1941 | do { |
| 1942 | if (++firstT == count) { |
| 1943 | firstT = 0; |
| 1944 | } |
| 1945 | const SkOpAngle* angle = sorted[firstT]; |
| 1946 | SkASSERT(!onlySortable || !angle->unsortable()); |
| 1947 | leftSegment = angle->segment(); |
| 1948 | *tIndexPtr = angle->end(); |
| 1949 | *endIndexPtr = angle->start(); |
| 1950 | } while (leftSegment->fTs[SkMin32(*tIndexPtr, *endIndexPtr)].fDone); |
| 1951 | if (leftSegment->verb() >= SkPath::kQuad_Verb) { |
| 1952 | const int tIndex = *tIndexPtr; |
| 1953 | const int endIndex = *endIndexPtr; |
| 1954 | if (!leftSegment->clockwise(tIndex, endIndex)) { |
| 1955 | bool swap = !leftSegment->monotonicInY(tIndex, endIndex) |
| 1956 | && !leftSegment->serpentine(tIndex, endIndex); |
| 1957 | #if DEBUG_SWAP_TOP |
| 1958 | SkDebugf("%s swap=%d serpentine=%d containedByEnds=%d monotonic=%d\n", __FUNCTION__, |
| 1959 | swap, |
| 1960 | leftSegment->serpentine(tIndex, endIndex), |
| 1961 | leftSegment->controlsContainedByEnds(tIndex, endIndex), |
| 1962 | leftSegment->monotonicInY(tIndex, endIndex)); |
| 1963 | #endif |
| 1964 | if (swap) { |
| 1965 | // FIXME: I doubt it makes sense to (necessarily) swap if the edge was not the first |
| 1966 | // sorted but merely the first not already processed (i.e., not done) |
| 1967 | SkTSwap(*tIndexPtr, *endIndexPtr); |
| 1968 | } |
| 1969 | } |
| 1970 | } |
| 1971 | SkASSERT(!leftSegment->fTs[SkMin32(*tIndexPtr, *endIndexPtr)].fTiny); |
| 1972 | return leftSegment; |
| 1973 | } |
| 1974 | |
| 1975 | // FIXME: not crazy about this |
| 1976 | // when the intersections are performed, the other index is into an |
| 1977 | // incomplete array. As the array grows, the indices become incorrect |
| 1978 | // while the following fixes the indices up again, it isn't smart about |
| 1979 | // skipping segments whose indices are already correct |
| 1980 | // assuming we leave the code that wrote the index in the first place |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 1981 | // FIXME: if called after remove, this needs to correct tiny |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1982 | void SkOpSegment::fixOtherTIndex() { |
| 1983 | int iCount = fTs.count(); |
| 1984 | for (int i = 0; i < iCount; ++i) { |
| 1985 | SkOpSpan& iSpan = fTs[i]; |
| 1986 | double oT = iSpan.fOtherT; |
| 1987 | SkOpSegment* other = iSpan.fOther; |
| 1988 | int oCount = other->fTs.count(); |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1989 | SkDEBUGCODE(iSpan.fOtherIndex = -1); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1990 | for (int o = 0; o < oCount; ++o) { |
| 1991 | SkOpSpan& oSpan = other->fTs[o]; |
| 1992 | if (oT == oSpan.fT && this == oSpan.fOther && oSpan.fOtherT == iSpan.fT) { |
| 1993 | iSpan.fOtherIndex = o; |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1994 | oSpan.fOtherIndex = i; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1995 | break; |
| 1996 | } |
| 1997 | } |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 1998 | SkASSERT(iSpan.fOtherIndex >= 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 1999 | } |
| 2000 | } |
| 2001 | |
| 2002 | void SkOpSegment::init(const SkPoint pts[], SkPath::Verb verb, bool operand, bool evenOdd) { |
| 2003 | fDoneSpans = 0; |
| 2004 | fOperand = operand; |
| 2005 | fXor = evenOdd; |
| 2006 | fPts = pts; |
| 2007 | fVerb = verb; |
| 2008 | } |
| 2009 | |
| 2010 | void SkOpSegment::initWinding(int start, int end) { |
| 2011 | int local = spanSign(start, end); |
| 2012 | int oppLocal = oppSign(start, end); |
| 2013 | (void) markAndChaseWinding(start, end, local, oppLocal); |
| 2014 | // OPTIMIZATION: the reverse mark and chase could skip the first marking |
| 2015 | (void) markAndChaseWinding(end, start, local, oppLocal); |
| 2016 | } |
| 2017 | |
| 2018 | /* |
| 2019 | when we start with a vertical intersect, we try to use the dx to determine if the edge is to |
| 2020 | the left or the right of vertical. This determines if we need to add the span's |
| 2021 | sign or not. However, this isn't enough. |
| 2022 | If the supplied sign (winding) is zero, then we didn't hit another vertical span, so dx is needed. |
| 2023 | If there was a winding, then it may or may not need adjusting. If the span the winding was borrowed |
| 2024 | from has the same x direction as this span, the winding should change. If the dx is opposite, then |
| 2025 | the same winding is shared by both. |
| 2026 | */ |
| 2027 | void SkOpSegment::initWinding(int start, int end, double tHit, int winding, SkScalar hitDx, |
| 2028 | int oppWind, SkScalar hitOppDx) { |
| 2029 | SkASSERT(hitDx || !winding); |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 2030 | SkScalar dx = (*CurveSlopeAtT[SkPathOpsVerbToPoints(fVerb)])(fPts, tHit).fX; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2031 | SkASSERT(dx); |
| 2032 | int windVal = windValue(SkMin32(start, end)); |
| 2033 | #if DEBUG_WINDING_AT_T |
| 2034 | SkDebugf("%s oldWinding=%d hitDx=%c dx=%c windVal=%d", __FUNCTION__, winding, |
| 2035 | hitDx ? hitDx > 0 ? '+' : '-' : '0', dx > 0 ? '+' : '-', windVal); |
| 2036 | #endif |
| 2037 | if (!winding) { |
| 2038 | winding = dx < 0 ? windVal : -windVal; |
| 2039 | } else if (winding * dx < 0) { |
| 2040 | int sideWind = winding + (dx < 0 ? windVal : -windVal); |
| 2041 | if (abs(winding) < abs(sideWind)) { |
| 2042 | winding = sideWind; |
| 2043 | } |
| 2044 | } |
| 2045 | #if DEBUG_WINDING_AT_T |
| 2046 | SkDebugf(" winding=%d\n", winding); |
| 2047 | #endif |
| 2048 | SkDEBUGCODE(int oppLocal = oppSign(start, end)); |
| 2049 | SkASSERT(hitOppDx || !oppWind || !oppLocal); |
| 2050 | int oppWindVal = oppValue(SkMin32(start, end)); |
| 2051 | if (!oppWind) { |
| 2052 | oppWind = dx < 0 ? oppWindVal : -oppWindVal; |
| 2053 | } else if (hitOppDx * dx >= 0) { |
| 2054 | int oppSideWind = oppWind + (dx < 0 ? oppWindVal : -oppWindVal); |
| 2055 | if (abs(oppWind) < abs(oppSideWind)) { |
| 2056 | oppWind = oppSideWind; |
| 2057 | } |
| 2058 | } |
| 2059 | (void) markAndChaseWinding(start, end, winding, oppWind); |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2060 | // OPTIMIZATION: the reverse mark and chase could skip the first marking |
| 2061 | (void) markAndChaseWinding(end, start, winding, oppWind); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2062 | } |
| 2063 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2064 | // OPTIMIZE: successive calls could start were the last leaves off |
| 2065 | // or calls could specialize to walk forwards or backwards |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2066 | bool SkOpSegment::isMissing(double startT, const SkPoint& pt) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2067 | size_t tCount = fTs.count(); |
| 2068 | for (size_t index = 0; index < tCount; ++index) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2069 | const SkOpSpan& span = fTs[index]; |
| 2070 | if (approximately_zero(startT - span.fT) && pt == span.fPt) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2071 | return false; |
| 2072 | } |
| 2073 | } |
| 2074 | return true; |
| 2075 | } |
| 2076 | |
| 2077 | bool SkOpSegment::isSimple(int end) const { |
| 2078 | int count = fTs.count(); |
| 2079 | if (count == 2) { |
| 2080 | return true; |
| 2081 | } |
| 2082 | double t = fTs[end].fT; |
| 2083 | if (approximately_less_than_zero(t)) { |
| 2084 | return !approximately_less_than_zero(fTs[1].fT); |
| 2085 | } |
| 2086 | if (approximately_greater_than_one(t)) { |
| 2087 | return !approximately_greater_than_one(fTs[count - 2].fT); |
| 2088 | } |
| 2089 | return false; |
| 2090 | } |
| 2091 | |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 2092 | bool SkOpSegment::isTiny(const SkOpAngle* angle) const { |
| 2093 | int start = angle->start(); |
| 2094 | int end = angle->end(); |
| 2095 | const SkOpSpan& mSpan = fTs[SkMin32(start, end)]; |
| 2096 | return mSpan.fTiny; |
| 2097 | } |
| 2098 | |
| 2099 | bool SkOpSegment::isTiny(int index) const { |
| 2100 | return fTs[index].fTiny; |
| 2101 | } |
| 2102 | |
| 2103 | // look pair of active edges going away from coincident edge |
| 2104 | // one of them should be the continuation of other |
| 2105 | // if both are active, look to see if they both the connect to another coincident pair |
| 2106 | // if one at least one is a line, then make the pair coincident |
| 2107 | // if neither is a line, test for coincidence |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2108 | bool SkOpSegment::joinCoincidence(SkOpSegment* other, double otherT, int step, |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 2109 | bool cancel) { |
| 2110 | int otherTIndex = other->findT(otherT, this); |
| 2111 | int next = other->nextExactSpan(otherTIndex, step); |
| 2112 | int otherMin = SkTMin(otherTIndex, next); |
| 2113 | int otherWind = other->span(otherMin).fWindValue; |
| 2114 | if (otherWind == 0) { |
| 2115 | return false; |
| 2116 | } |
| 2117 | SkASSERT(next >= 0); |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2118 | int tIndex = 0; |
| 2119 | do { |
| 2120 | SkOpSpan* test = &fTs[tIndex]; |
| 2121 | SkASSERT(test->fT == 0); |
| 2122 | if (test->fOther == other || test->fOtherT != 1) { |
| 2123 | continue; |
| 2124 | } |
| 2125 | SkPoint startPt, endPt; |
| 2126 | double endT; |
| 2127 | if (findCoincidentMatch(test, other, otherTIndex, next, step, &startPt, &endPt, &endT)) { |
| 2128 | SkOpSegment* match = test->fOther; |
| 2129 | if (cancel) { |
| 2130 | match->addTCancel(startPt, endPt, other); |
| 2131 | } else { |
| 2132 | match->addTCoincident(startPt, endPt, endT, other); |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 2133 | } |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2134 | return true; |
| 2135 | } |
| 2136 | } while (fTs[++tIndex].fT == 0); |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 2137 | return false; |
| 2138 | } |
| 2139 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2140 | // this span is excluded by the winding rule -- chase the ends |
| 2141 | // as long as they are unambiguous to mark connections as done |
| 2142 | // and give them the same winding value |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2143 | |
| 2144 | SkOpSpan* SkOpSegment::markAndChaseDoneBinary(int index, int endIndex) { |
| 2145 | int step = SkSign32(endIndex - index); |
| 2146 | int min = SkMin32(index, endIndex); |
| 2147 | markDoneBinary(min); |
| 2148 | SkOpSpan* last; |
| 2149 | SkOpSegment* other = this; |
| 2150 | while ((other = other->nextChase(&index, step, &min, &last))) { |
| 2151 | if (other->done()) { |
| 2152 | return NULL; |
| 2153 | } |
| 2154 | other->markDoneBinary(min); |
| 2155 | } |
| 2156 | return last; |
| 2157 | } |
| 2158 | |
| 2159 | SkOpSpan* SkOpSegment::markAndChaseDoneUnary(int index, int endIndex) { |
| 2160 | int step = SkSign32(endIndex - index); |
| 2161 | int min = SkMin32(index, endIndex); |
| 2162 | markDoneUnary(min); |
| 2163 | SkOpSpan* last; |
| 2164 | SkOpSegment* other = this; |
| 2165 | while ((other = other->nextChase(&index, step, &min, &last))) { |
| 2166 | if (other->done()) { |
| 2167 | return NULL; |
| 2168 | } |
| 2169 | other->markDoneUnary(min); |
| 2170 | } |
| 2171 | return last; |
| 2172 | } |
| 2173 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2174 | SkOpSpan* SkOpSegment::markAndChaseWinding(const SkOpAngle* angle, const int winding) { |
| 2175 | int index = angle->start(); |
| 2176 | int endIndex = angle->end(); |
| 2177 | int step = SkSign32(endIndex - index); |
| 2178 | int min = SkMin32(index, endIndex); |
| 2179 | markWinding(min, winding); |
| 2180 | SkOpSpan* last; |
| 2181 | SkOpSegment* other = this; |
| 2182 | while ((other = other->nextChase(&index, step, &min, &last))) { |
| 2183 | if (other->fTs[min].fWindSum != SK_MinS32) { |
| 2184 | SkASSERT(other->fTs[min].fWindSum == winding); |
| 2185 | return NULL; |
| 2186 | } |
| 2187 | other->markWinding(min, winding); |
| 2188 | } |
| 2189 | return last; |
| 2190 | } |
| 2191 | |
| 2192 | SkOpSpan* SkOpSegment::markAndChaseWinding(int index, int endIndex, int winding, int oppWinding) { |
| 2193 | int min = SkMin32(index, endIndex); |
| 2194 | int step = SkSign32(endIndex - index); |
| 2195 | markWinding(min, winding, oppWinding); |
| 2196 | SkOpSpan* last; |
| 2197 | SkOpSegment* other = this; |
| 2198 | while ((other = other->nextChase(&index, step, &min, &last))) { |
| 2199 | if (other->fTs[min].fWindSum != SK_MinS32) { |
| 2200 | SkASSERT(other->fTs[min].fWindSum == winding || other->fTs[min].fLoop); |
| 2201 | return NULL; |
| 2202 | } |
| 2203 | other->markWinding(min, winding, oppWinding); |
| 2204 | } |
| 2205 | return last; |
| 2206 | } |
| 2207 | |
| 2208 | SkOpSpan* SkOpSegment::markAndChaseWinding(const SkOpAngle* angle, int winding, int oppWinding) { |
| 2209 | int start = angle->start(); |
| 2210 | int end = angle->end(); |
| 2211 | return markAndChaseWinding(start, end, winding, oppWinding); |
| 2212 | } |
| 2213 | |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2214 | SkOpSpan* SkOpSegment::markAngle(int maxWinding, int sumWinding, const SkOpAngle* angle) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2215 | SkASSERT(angle->segment() == this); |
| 2216 | if (UseInnerWinding(maxWinding, sumWinding)) { |
| 2217 | maxWinding = sumWinding; |
| 2218 | } |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2219 | SkOpSpan* last = markAndChaseWinding(angle, maxWinding); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2220 | #if DEBUG_WINDING |
| 2221 | if (last) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2222 | SkDebugf("%s last id=%d windSum=", __FUNCTION__, |
| 2223 | last->fOther->fTs[last->fOtherIndex].fOther->debugID()); |
| 2224 | SkPathOpsDebug::WindingPrintf(last->fWindSum); |
| 2225 | SkDebugf(" small=%d\n", last->fSmall); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2226 | } |
| 2227 | #endif |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2228 | return last; |
| 2229 | } |
| 2230 | |
| 2231 | SkOpSpan* SkOpSegment::markAngle(int maxWinding, int sumWinding, int oppMaxWinding, |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2232 | int oppSumWinding, const SkOpAngle* angle) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2233 | SkASSERT(angle->segment() == this); |
| 2234 | if (UseInnerWinding(maxWinding, sumWinding)) { |
| 2235 | maxWinding = sumWinding; |
| 2236 | } |
| 2237 | if (oppMaxWinding != oppSumWinding && UseInnerWinding(oppMaxWinding, oppSumWinding)) { |
| 2238 | oppMaxWinding = oppSumWinding; |
| 2239 | } |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2240 | SkOpSpan* last = markAndChaseWinding(angle, maxWinding, oppMaxWinding); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2241 | #if DEBUG_WINDING |
| 2242 | if (last) { |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2243 | SkDebugf("%s last id=%d windSum=", __FUNCTION__, |
| 2244 | last->fOther->fTs[last->fOtherIndex].fOther->debugID()); |
| 2245 | SkPathOpsDebug::WindingPrintf(last->fWindSum); |
| 2246 | SkDebugf(" small=%d\n", last->fSmall); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2247 | } |
| 2248 | #endif |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2249 | return last; |
| 2250 | } |
| 2251 | |
| 2252 | // FIXME: this should also mark spans with equal (x,y) |
| 2253 | // This may be called when the segment is already marked done. While this |
| 2254 | // wastes time, it shouldn't do any more than spin through the T spans. |
| 2255 | // OPTIMIZATION: abort on first done found (assuming that this code is |
| 2256 | // always called to mark segments done). |
| 2257 | void SkOpSegment::markDone(int index, int winding) { |
| 2258 | // SkASSERT(!done()); |
| 2259 | SkASSERT(winding); |
| 2260 | double referenceT = fTs[index].fT; |
| 2261 | int lesser = index; |
| 2262 | while (--lesser >= 0 && precisely_negative(referenceT - fTs[lesser].fT)) { |
| 2263 | markOneDone(__FUNCTION__, lesser, winding); |
| 2264 | } |
| 2265 | do { |
| 2266 | markOneDone(__FUNCTION__, index, winding); |
| 2267 | } while (++index < fTs.count() && precisely_negative(fTs[index].fT - referenceT)); |
| 2268 | } |
| 2269 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2270 | void SkOpSegment::markDoneBinary(int index) { |
| 2271 | double referenceT = fTs[index].fT; |
| 2272 | int lesser = index; |
| 2273 | while (--lesser >= 0 && precisely_negative(referenceT - fTs[lesser].fT)) { |
| 2274 | markOneDoneBinary(__FUNCTION__, lesser); |
| 2275 | } |
| 2276 | do { |
| 2277 | markOneDoneBinary(__FUNCTION__, index); |
| 2278 | } while (++index < fTs.count() && precisely_negative(fTs[index].fT - referenceT)); |
| 2279 | } |
| 2280 | |
| 2281 | void SkOpSegment::markDoneUnary(int index) { |
| 2282 | double referenceT = fTs[index].fT; |
| 2283 | int lesser = index; |
| 2284 | while (--lesser >= 0 && precisely_negative(referenceT - fTs[lesser].fT)) { |
| 2285 | markOneDoneUnary(__FUNCTION__, lesser); |
| 2286 | } |
| 2287 | do { |
| 2288 | markOneDoneUnary(__FUNCTION__, index); |
| 2289 | } while (++index < fTs.count() && precisely_negative(fTs[index].fT - referenceT)); |
| 2290 | } |
| 2291 | |
| 2292 | void SkOpSegment::markOneDone(const char* funName, int tIndex, int winding) { |
| 2293 | SkOpSpan* span = markOneWinding(funName, tIndex, winding); |
| 2294 | if (!span) { |
| 2295 | return; |
| 2296 | } |
| 2297 | span->fDone = true; |
| 2298 | fDoneSpans++; |
| 2299 | } |
| 2300 | |
| 2301 | void SkOpSegment::markOneDoneBinary(const char* funName, int tIndex) { |
| 2302 | SkOpSpan* span = verifyOneWinding(funName, tIndex); |
| 2303 | if (!span) { |
| 2304 | return; |
| 2305 | } |
| 2306 | span->fDone = true; |
| 2307 | fDoneSpans++; |
| 2308 | } |
| 2309 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2310 | void SkOpSegment::markOneDoneUnary(const char* funName, int tIndex) { |
| 2311 | SkOpSpan* span = verifyOneWindingU(funName, tIndex); |
| 2312 | if (!span) { |
| 2313 | return; |
| 2314 | } |
| 2315 | span->fDone = true; |
| 2316 | fDoneSpans++; |
| 2317 | } |
| 2318 | |
| 2319 | SkOpSpan* SkOpSegment::markOneWinding(const char* funName, int tIndex, int winding) { |
| 2320 | SkOpSpan& span = fTs[tIndex]; |
| 2321 | if (span.fDone) { |
| 2322 | return NULL; |
| 2323 | } |
| 2324 | #if DEBUG_MARK_DONE |
| 2325 | debugShowNewWinding(funName, span, winding); |
| 2326 | #endif |
| 2327 | SkASSERT(span.fWindSum == SK_MinS32 || span.fWindSum == winding); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2328 | SkASSERT(abs(winding) <= SkPathOpsDebug::gMaxWindSum); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2329 | span.fWindSum = winding; |
| 2330 | return &span; |
| 2331 | } |
| 2332 | |
| 2333 | SkOpSpan* SkOpSegment::markOneWinding(const char* funName, int tIndex, int winding, |
| 2334 | int oppWinding) { |
| 2335 | SkOpSpan& span = fTs[tIndex]; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2336 | if (span.fDone && !span.fSmall) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2337 | return NULL; |
| 2338 | } |
| 2339 | #if DEBUG_MARK_DONE |
| 2340 | debugShowNewWinding(funName, span, winding, oppWinding); |
| 2341 | #endif |
| 2342 | SkASSERT(span.fWindSum == SK_MinS32 || span.fWindSum == winding); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2343 | SkASSERT(abs(winding) <= SkPathOpsDebug::gMaxWindSum); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2344 | span.fWindSum = winding; |
| 2345 | SkASSERT(span.fOppSum == SK_MinS32 || span.fOppSum == oppWinding); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2346 | SkASSERT(abs(oppWinding) <= SkPathOpsDebug::gMaxWindSum); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2347 | span.fOppSum = oppWinding; |
| 2348 | return &span; |
| 2349 | } |
| 2350 | |
| 2351 | // from http://stackoverflow.com/questions/1165647/how-to-determine-if-a-list-of-polygon-points-are-in-clockwise-order |
| 2352 | bool SkOpSegment::clockwise(int tStart, int tEnd) const { |
| 2353 | SkASSERT(fVerb != SkPath::kLine_Verb); |
| 2354 | SkPoint edge[4]; |
| 2355 | subDivide(tStart, tEnd, edge); |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2356 | int points = SkPathOpsVerbToPoints(fVerb); |
| 2357 | double sum = (edge[0].fX - edge[points].fX) * (edge[0].fY + edge[points].fY); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2358 | if (fVerb == SkPath::kCubic_Verb) { |
| 2359 | SkScalar lesser = SkTMin<SkScalar>(edge[0].fY, edge[3].fY); |
| 2360 | if (edge[1].fY < lesser && edge[2].fY < lesser) { |
| 2361 | SkDLine tangent1 = {{ {edge[0].fX, edge[0].fY}, {edge[1].fX, edge[1].fY} }}; |
| 2362 | SkDLine tangent2 = {{ {edge[2].fX, edge[2].fY}, {edge[3].fX, edge[3].fY} }}; |
| 2363 | if (SkIntersections::Test(tangent1, tangent2)) { |
| 2364 | SkPoint topPt = cubic_top(fPts, fTs[tStart].fT, fTs[tEnd].fT); |
| 2365 | sum += (topPt.fX - edge[0].fX) * (topPt.fY + edge[0].fY); |
| 2366 | sum += (edge[3].fX - topPt.fX) * (edge[3].fY + topPt.fY); |
| 2367 | return sum <= 0; |
| 2368 | } |
| 2369 | } |
| 2370 | } |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2371 | for (int idx = 0; idx < points; ++idx){ |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2372 | sum += (edge[idx + 1].fX - edge[idx].fX) * (edge[idx + 1].fY + edge[idx].fY); |
| 2373 | } |
| 2374 | return sum <= 0; |
| 2375 | } |
| 2376 | |
| 2377 | bool SkOpSegment::monotonicInY(int tStart, int tEnd) const { |
| 2378 | if (fVerb == SkPath::kLine_Verb) { |
| 2379 | return false; |
| 2380 | } |
| 2381 | if (fVerb == SkPath::kQuad_Verb) { |
| 2382 | SkDQuad dst = SkDQuad::SubDivide(fPts, fTs[tStart].fT, fTs[tEnd].fT); |
| 2383 | return dst.monotonicInY(); |
| 2384 | } |
| 2385 | SkASSERT(fVerb == SkPath::kCubic_Verb); |
| 2386 | SkDCubic dst = SkDCubic::SubDivide(fPts, fTs[tStart].fT, fTs[tEnd].fT); |
| 2387 | return dst.monotonicInY(); |
| 2388 | } |
| 2389 | |
| 2390 | bool SkOpSegment::serpentine(int tStart, int tEnd) const { |
| 2391 | if (fVerb != SkPath::kCubic_Verb) { |
| 2392 | return false; |
| 2393 | } |
| 2394 | SkDCubic dst = SkDCubic::SubDivide(fPts, fTs[tStart].fT, fTs[tEnd].fT); |
| 2395 | return dst.serpentine(); |
| 2396 | } |
| 2397 | |
| 2398 | SkOpSpan* SkOpSegment::verifyOneWinding(const char* funName, int tIndex) { |
| 2399 | SkOpSpan& span = fTs[tIndex]; |
| 2400 | if (span.fDone) { |
| 2401 | return NULL; |
| 2402 | } |
| 2403 | #if DEBUG_MARK_DONE |
| 2404 | debugShowNewWinding(funName, span, span.fWindSum, span.fOppSum); |
| 2405 | #endif |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2406 | // If the prior angle in the sort is unorderable, the winding sum may not be computable. |
| 2407 | // To enable the assert, the 'prior is unorderable' state could be |
| 2408 | // piped down to this test, but not sure it's worth it. |
| 2409 | // (Once the sort order is stored in the span, this test may be feasible.) |
| 2410 | // SkASSERT(span.fWindSum != SK_MinS32); |
| 2411 | // SkASSERT(span.fOppSum != SK_MinS32); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2412 | return &span; |
| 2413 | } |
| 2414 | |
| 2415 | SkOpSpan* SkOpSegment::verifyOneWindingU(const char* funName, int tIndex) { |
| 2416 | SkOpSpan& span = fTs[tIndex]; |
| 2417 | if (span.fDone) { |
| 2418 | return NULL; |
| 2419 | } |
| 2420 | #if DEBUG_MARK_DONE |
| 2421 | debugShowNewWinding(funName, span, span.fWindSum); |
| 2422 | #endif |
commit-bot@chromium.org | 866f4e3 | 2013-11-21 17:04:29 +0000 | [diff] [blame^] | 2423 | // If the prior angle in the sort is unorderable, the winding sum may not be computable. |
| 2424 | // To enable the assert, the 'prior is unorderable' state could be |
| 2425 | // piped down to this test, but not sure it's worth it. |
| 2426 | // (Once the sort order is stored in the span, this test may be feasible.) |
| 2427 | // SkASSERT(span.fWindSum != SK_MinS32); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2428 | return &span; |
| 2429 | } |
| 2430 | |
| 2431 | // note that just because a span has one end that is unsortable, that's |
| 2432 | // not enough to mark it done. The other end may be sortable, allowing the |
| 2433 | // span to be added. |
| 2434 | // FIXME: if abs(start - end) > 1, mark intermediates as unsortable on both ends |
| 2435 | void SkOpSegment::markUnsortable(int start, int end) { |
| 2436 | SkOpSpan* span = &fTs[start]; |
| 2437 | if (start < end) { |
| 2438 | #if DEBUG_UNSORTABLE |
| 2439 | debugShowNewWinding(__FUNCTION__, *span, 0); |
| 2440 | #endif |
| 2441 | span->fUnsortableStart = true; |
| 2442 | } else { |
| 2443 | --span; |
| 2444 | #if DEBUG_UNSORTABLE |
| 2445 | debugShowNewWinding(__FUNCTION__, *span, 0); |
| 2446 | #endif |
| 2447 | span->fUnsortableEnd = true; |
| 2448 | } |
| 2449 | if (!span->fUnsortableStart || !span->fUnsortableEnd || span->fDone) { |
| 2450 | return; |
| 2451 | } |
| 2452 | span->fDone = true; |
| 2453 | fDoneSpans++; |
| 2454 | } |
| 2455 | |
| 2456 | void SkOpSegment::markWinding(int index, int winding) { |
| 2457 | // SkASSERT(!done()); |
| 2458 | SkASSERT(winding); |
| 2459 | double referenceT = fTs[index].fT; |
| 2460 | int lesser = index; |
| 2461 | while (--lesser >= 0 && precisely_negative(referenceT - fTs[lesser].fT)) { |
| 2462 | markOneWinding(__FUNCTION__, lesser, winding); |
| 2463 | } |
| 2464 | do { |
| 2465 | markOneWinding(__FUNCTION__, index, winding); |
| 2466 | } while (++index < fTs.count() && precisely_negative(fTs[index].fT - referenceT)); |
| 2467 | } |
| 2468 | |
| 2469 | void SkOpSegment::markWinding(int index, int winding, int oppWinding) { |
| 2470 | // SkASSERT(!done()); |
| 2471 | SkASSERT(winding || oppWinding); |
| 2472 | double referenceT = fTs[index].fT; |
| 2473 | int lesser = index; |
| 2474 | while (--lesser >= 0 && precisely_negative(referenceT - fTs[lesser].fT)) { |
| 2475 | markOneWinding(__FUNCTION__, lesser, winding, oppWinding); |
| 2476 | } |
| 2477 | do { |
| 2478 | markOneWinding(__FUNCTION__, index, winding, oppWinding); |
| 2479 | } while (++index < fTs.count() && precisely_negative(fTs[index].fT - referenceT)); |
| 2480 | } |
| 2481 | |
| 2482 | void SkOpSegment::matchWindingValue(int tIndex, double t, bool borrowWind) { |
| 2483 | int nextDoorWind = SK_MaxS32; |
| 2484 | int nextOppWind = SK_MaxS32; |
| 2485 | if (tIndex > 0) { |
| 2486 | const SkOpSpan& below = fTs[tIndex - 1]; |
| 2487 | if (approximately_negative(t - below.fT)) { |
| 2488 | nextDoorWind = below.fWindValue; |
| 2489 | nextOppWind = below.fOppValue; |
| 2490 | } |
| 2491 | } |
| 2492 | if (nextDoorWind == SK_MaxS32 && tIndex + 1 < fTs.count()) { |
| 2493 | const SkOpSpan& above = fTs[tIndex + 1]; |
| 2494 | if (approximately_negative(above.fT - t)) { |
| 2495 | nextDoorWind = above.fWindValue; |
| 2496 | nextOppWind = above.fOppValue; |
| 2497 | } |
| 2498 | } |
| 2499 | if (nextDoorWind == SK_MaxS32 && borrowWind && tIndex > 0 && t < 1) { |
| 2500 | const SkOpSpan& below = fTs[tIndex - 1]; |
| 2501 | nextDoorWind = below.fWindValue; |
| 2502 | nextOppWind = below.fOppValue; |
| 2503 | } |
| 2504 | if (nextDoorWind != SK_MaxS32) { |
| 2505 | SkOpSpan& newSpan = fTs[tIndex]; |
| 2506 | newSpan.fWindValue = nextDoorWind; |
| 2507 | newSpan.fOppValue = nextOppWind; |
| 2508 | if (!nextDoorWind && !nextOppWind && !newSpan.fDone) { |
| 2509 | newSpan.fDone = true; |
| 2510 | ++fDoneSpans; |
| 2511 | } |
| 2512 | } |
| 2513 | } |
| 2514 | |
| 2515 | // return span if when chasing, two or more radiating spans are not done |
| 2516 | // OPTIMIZATION: ? multiple spans is detected when there is only one valid |
| 2517 | // candidate and the remaining spans have windValue == 0 (canceled by |
| 2518 | // coincidence). The coincident edges could either be removed altogether, |
| 2519 | // or this code could be more complicated in detecting this case. Worth it? |
| 2520 | bool SkOpSegment::multipleSpans(int end) const { |
| 2521 | return end > 0 && end < fTs.count() - 1; |
| 2522 | } |
| 2523 | |
| 2524 | bool SkOpSegment::nextCandidate(int* start, int* end) const { |
| 2525 | while (fTs[*end].fDone) { |
| 2526 | if (fTs[*end].fT == 1) { |
| 2527 | return false; |
| 2528 | } |
| 2529 | ++(*end); |
| 2530 | } |
| 2531 | *start = *end; |
| 2532 | *end = nextExactSpan(*start, 1); |
| 2533 | return true; |
| 2534 | } |
| 2535 | |
| 2536 | SkOpSegment* SkOpSegment::nextChase(int* index, const int step, int* min, SkOpSpan** last) { |
| 2537 | int end = nextExactSpan(*index, step); |
| 2538 | SkASSERT(end >= 0); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2539 | if (fTs[end].fSmall) { |
| 2540 | *last = NULL; |
| 2541 | return NULL; |
| 2542 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2543 | if (multipleSpans(end)) { |
| 2544 | *last = &fTs[end]; |
| 2545 | return NULL; |
| 2546 | } |
| 2547 | const SkOpSpan& endSpan = fTs[end]; |
| 2548 | SkOpSegment* other = endSpan.fOther; |
| 2549 | *index = endSpan.fOtherIndex; |
fmalita@google.com | 22eb794 | 2013-05-01 20:35:51 +0000 | [diff] [blame] | 2550 | SkASSERT(*index >= 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2551 | int otherEnd = other->nextExactSpan(*index, step); |
| 2552 | SkASSERT(otherEnd >= 0); |
| 2553 | *min = SkMin32(*index, otherEnd); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2554 | if (other->fTs[*min].fSmall) { |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 2555 | *last = NULL; |
| 2556 | return NULL; |
| 2557 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2558 | return other; |
| 2559 | } |
| 2560 | |
| 2561 | // This has callers for two different situations: one establishes the end |
| 2562 | // of the current span, and one establishes the beginning of the next span |
| 2563 | // (thus the name). When this is looking for the end of the current span, |
| 2564 | // coincidence is found when the beginning Ts contain -step and the end |
| 2565 | // contains step. When it is looking for the beginning of the next, the |
| 2566 | // first Ts found can be ignored and the last Ts should contain -step. |
| 2567 | // OPTIMIZATION: probably should split into two functions |
| 2568 | int SkOpSegment::nextSpan(int from, int step) const { |
| 2569 | const SkOpSpan& fromSpan = fTs[from]; |
| 2570 | int count = fTs.count(); |
| 2571 | int to = from; |
| 2572 | while (step > 0 ? ++to < count : --to >= 0) { |
| 2573 | const SkOpSpan& span = fTs[to]; |
| 2574 | if (approximately_zero(span.fT - fromSpan.fT)) { |
| 2575 | continue; |
| 2576 | } |
| 2577 | return to; |
| 2578 | } |
| 2579 | return -1; |
| 2580 | } |
| 2581 | |
| 2582 | // FIXME |
| 2583 | // this returns at any difference in T, vs. a preset minimum. It may be |
| 2584 | // that all callers to nextSpan should use this instead. |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2585 | int SkOpSegment::nextExactSpan(int from, int step) const { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2586 | int to = from; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2587 | if (step < 0) { |
| 2588 | const SkOpSpan& fromSpan = fTs[from]; |
| 2589 | while (--to >= 0) { |
| 2590 | const SkOpSpan& span = fTs[to]; |
| 2591 | if (precisely_negative(fromSpan.fT - span.fT) || span.fTiny) { |
| 2592 | continue; |
| 2593 | } |
| 2594 | return to; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2595 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2596 | } else { |
| 2597 | while (fTs[from].fTiny) { |
| 2598 | from++; |
| 2599 | } |
| 2600 | const SkOpSpan& fromSpan = fTs[from]; |
| 2601 | int count = fTs.count(); |
| 2602 | while (++to < count) { |
| 2603 | const SkOpSpan& span = fTs[to]; |
| 2604 | if (precisely_negative(span.fT - fromSpan.fT)) { |
| 2605 | continue; |
| 2606 | } |
| 2607 | return to; |
| 2608 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2609 | } |
| 2610 | return -1; |
| 2611 | } |
| 2612 | |
| 2613 | void SkOpSegment::setUpWindings(int index, int endIndex, int* sumMiWinding, int* sumSuWinding, |
| 2614 | int* maxWinding, int* sumWinding, int* oppMaxWinding, int* oppSumWinding) { |
| 2615 | int deltaSum = spanSign(index, endIndex); |
| 2616 | int oppDeltaSum = oppSign(index, endIndex); |
| 2617 | if (operand()) { |
| 2618 | *maxWinding = *sumSuWinding; |
| 2619 | *sumWinding = *sumSuWinding -= deltaSum; |
| 2620 | *oppMaxWinding = *sumMiWinding; |
| 2621 | *oppSumWinding = *sumMiWinding -= oppDeltaSum; |
| 2622 | } else { |
| 2623 | *maxWinding = *sumMiWinding; |
| 2624 | *sumWinding = *sumMiWinding -= deltaSum; |
| 2625 | *oppMaxWinding = *sumSuWinding; |
| 2626 | *oppSumWinding = *sumSuWinding -= oppDeltaSum; |
| 2627 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2628 | SkASSERT(abs(*sumWinding) <= SkPathOpsDebug::gMaxWindSum); |
| 2629 | SkASSERT(abs(*oppSumWinding) <= SkPathOpsDebug::gMaxWindSum); |
| 2630 | } |
| 2631 | |
| 2632 | void SkOpSegment::setUpWindings(int index, int endIndex, int* sumMiWinding, |
| 2633 | int* maxWinding, int* sumWinding) { |
| 2634 | int deltaSum = spanSign(index, endIndex); |
| 2635 | *maxWinding = *sumMiWinding; |
| 2636 | *sumWinding = *sumMiWinding -= deltaSum; |
| 2637 | SkASSERT(abs(*sumWinding) <= SkPathOpsDebug::gMaxWindSum); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2638 | } |
| 2639 | |
| 2640 | // This marks all spans unsortable so that this info is available for early |
| 2641 | // exclusion in find top and others. This could be optimized to only mark |
| 2642 | // adjacent spans that unsortable. However, this makes it difficult to later |
| 2643 | // determine starting points for edge detection in find top and the like. |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 2644 | bool SkOpSegment::SortAngles(const SkTArray<SkOpAngle, true>& angles, |
| 2645 | SkTArray<SkOpAngle*, true>* angleList, |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2646 | SortAngleKind orderKind) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2647 | bool sortable = true; |
| 2648 | int angleCount = angles.count(); |
| 2649 | int angleIndex; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2650 | for (angleIndex = 0; angleIndex < angleCount; ++angleIndex) { |
| 2651 | const SkOpAngle& angle = angles[angleIndex]; |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 2652 | angleList->push_back(const_cast<SkOpAngle*>(&angle)); |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2653 | #if DEBUG_ANGLE |
| 2654 | (*(angleList->end() - 1))->setID(angleIndex); |
| 2655 | #endif |
| 2656 | sortable &= !(angle.unsortable() || (orderKind == kMustBeOrdered_SortAngleKind |
| 2657 | && angle.unorderable())); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2658 | } |
| 2659 | if (sortable) { |
caryclark@google.com | 7dfbb07 | 2013-04-22 14:37:05 +0000 | [diff] [blame] | 2660 | SkTQSort<SkOpAngle>(angleList->begin(), angleList->end() - 1); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2661 | for (angleIndex = 0; angleIndex < angleCount; ++angleIndex) { |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2662 | if (angles[angleIndex].unsortable() || (orderKind == kMustBeOrdered_SortAngleKind |
| 2663 | && angles[angleIndex].unorderable())) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2664 | sortable = false; |
| 2665 | break; |
| 2666 | } |
| 2667 | } |
| 2668 | } |
| 2669 | if (!sortable) { |
| 2670 | for (angleIndex = 0; angleIndex < angleCount; ++angleIndex) { |
| 2671 | const SkOpAngle& angle = angles[angleIndex]; |
| 2672 | angle.segment()->markUnsortable(angle.start(), angle.end()); |
| 2673 | } |
| 2674 | } |
| 2675 | return sortable; |
| 2676 | } |
| 2677 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2678 | // set segments to unsortable if angle is unsortable, but do not set all angles |
| 2679 | // note that for a simple 4 way crossing, two of the edges may be orderable even though |
| 2680 | // two edges are too short to be orderable. |
| 2681 | // perhaps some classes of unsortable angles should make all shared angles unsortable, but |
| 2682 | // simple lines that have tiny crossings are always sortable on the large ends |
| 2683 | // OPTIMIZATION: check earlier when angles are added to input if any are unsortable |
| 2684 | // may make sense then to mark all segments in angle sweep as unsortableStart/unsortableEnd |
| 2685 | // solely for the purpose of short-circuiting future angle building around this center |
| 2686 | bool SkOpSegment::SortAngles2(const SkTArray<SkOpAngle, true>& angles, |
| 2687 | SkTArray<SkOpAngle*, true>* angleList) { |
| 2688 | int angleCount = angles.count(); |
| 2689 | int angleIndex; |
| 2690 | for (angleIndex = 0; angleIndex < angleCount; ++angleIndex) { |
| 2691 | const SkOpAngle& angle = angles[angleIndex]; |
| 2692 | if (angle.unsortable()) { |
| 2693 | return false; |
| 2694 | } |
| 2695 | angleList->push_back(const_cast<SkOpAngle*>(&angle)); |
| 2696 | #if DEBUG_ANGLE |
| 2697 | (*(angleList->end() - 1))->setID(angleIndex); |
| 2698 | #endif |
| 2699 | } |
| 2700 | SkTQSort<SkOpAngle>(angleList->begin(), angleList->end() - 1); |
| 2701 | // at this point angles are sorted but individually may not be orderable |
| 2702 | // this means that only adjcent orderable segments may transfer winding |
| 2703 | return true; |
| 2704 | } |
| 2705 | |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2706 | // return true if midpoints were computed |
| 2707 | bool SkOpSegment::subDivide(int start, int end, SkPoint edge[4]) const { |
| 2708 | SkASSERT(start != end); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2709 | edge[0] = fTs[start].fPt; |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2710 | int points = SkPathOpsVerbToPoints(fVerb); |
| 2711 | edge[points] = fTs[end].fPt; |
| 2712 | if (fVerb == SkPath::kLine_Verb) { |
| 2713 | return false; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2714 | } |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 2715 | double startT = fTs[start].fT; |
| 2716 | double endT = fTs[end].fT; |
| 2717 | if ((startT == 0 || endT == 0) && (startT == 1 || endT == 1)) { |
| 2718 | // don't compute midpoints if we already have them |
| 2719 | if (fVerb == SkPath::kQuad_Verb) { |
| 2720 | edge[1] = fPts[1]; |
| 2721 | return false; |
| 2722 | } |
| 2723 | SkASSERT(fVerb == SkPath::kCubic_Verb); |
| 2724 | if (start < end) { |
| 2725 | edge[1] = fPts[1]; |
| 2726 | edge[2] = fPts[2]; |
| 2727 | return false; |
| 2728 | } |
| 2729 | edge[1] = fPts[2]; |
| 2730 | edge[2] = fPts[1]; |
| 2731 | return false; |
| 2732 | } |
| 2733 | const SkDPoint sub[2] = {{ edge[0].fX, edge[0].fY}, {edge[points].fX, edge[points].fY }}; |
| 2734 | if (fVerb == SkPath::kQuad_Verb) { |
| 2735 | edge[1] = SkDQuad::SubDivide(fPts, sub[0], sub[1], startT, endT).asSkPoint(); |
| 2736 | } else { |
| 2737 | SkASSERT(fVerb == SkPath::kCubic_Verb); |
| 2738 | SkDPoint ctrl[2]; |
| 2739 | SkDCubic::SubDivide(fPts, sub[0], sub[1], startT, endT, ctrl); |
| 2740 | edge[1] = ctrl[0].asSkPoint(); |
| 2741 | edge[2] = ctrl[1].asSkPoint(); |
| 2742 | } |
| 2743 | return true; |
| 2744 | } |
| 2745 | |
| 2746 | // return true if midpoints were computed |
| 2747 | bool SkOpSegment::subDivide(int start, int end, SkDCubic* result) const { |
| 2748 | SkASSERT(start != end); |
| 2749 | (*result)[0].set(fTs[start].fPt); |
| 2750 | int points = SkPathOpsVerbToPoints(fVerb); |
| 2751 | (*result)[points].set(fTs[end].fPt); |
| 2752 | if (fVerb == SkPath::kLine_Verb) { |
| 2753 | return false; |
| 2754 | } |
| 2755 | double startT = fTs[start].fT; |
| 2756 | double endT = fTs[end].fT; |
| 2757 | if ((startT == 0 || endT == 0) && (startT == 1 || endT == 1)) { |
| 2758 | // don't compute midpoints if we already have them |
| 2759 | if (fVerb == SkPath::kQuad_Verb) { |
| 2760 | (*result)[1].set(fPts[1]); |
| 2761 | return false; |
| 2762 | } |
| 2763 | SkASSERT(fVerb == SkPath::kCubic_Verb); |
| 2764 | if (start < end) { |
| 2765 | (*result)[1].set(fPts[1]); |
| 2766 | (*result)[2].set(fPts[2]); |
| 2767 | return false; |
| 2768 | } |
| 2769 | (*result)[1].set(fPts[2]); |
| 2770 | (*result)[2].set(fPts[1]); |
| 2771 | return false; |
| 2772 | } |
| 2773 | if (fVerb == SkPath::kQuad_Verb) { |
| 2774 | (*result)[1] = SkDQuad::SubDivide(fPts, (*result)[0], (*result)[2], startT, endT); |
| 2775 | } else { |
| 2776 | SkASSERT(fVerb == SkPath::kCubic_Verb); |
| 2777 | SkDCubic::SubDivide(fPts, (*result)[0], (*result)[3], startT, endT, &(*result)[1]); |
| 2778 | } |
| 2779 | return true; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2780 | } |
| 2781 | |
| 2782 | void SkOpSegment::subDivideBounds(int start, int end, SkPathOpsBounds* bounds) const { |
| 2783 | SkPoint edge[4]; |
| 2784 | subDivide(start, end, edge); |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 2785 | (bounds->*SetCurveBounds[SkPathOpsVerbToPoints(fVerb)])(edge); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2786 | } |
| 2787 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2788 | void SkOpSegment::TrackOutsidePair(SkTArray<SkPoint, true>* outsidePts, const SkPoint& endPt, |
| 2789 | const SkPoint& startPt) { |
| 2790 | int outCount = outsidePts->count(); |
| 2791 | if (outCount == 0 || endPt != (*outsidePts)[outCount - 2]) { |
| 2792 | outsidePts->push_back(endPt); |
| 2793 | outsidePts->push_back(startPt); |
| 2794 | } |
| 2795 | } |
| 2796 | |
| 2797 | void SkOpSegment::TrackOutside(SkTArray<SkPoint, true>* outsidePts, const SkPoint& startPt) { |
| 2798 | int outCount = outsidePts->count(); |
| 2799 | if (outCount == 0 || startPt != (*outsidePts)[outCount - 1]) { |
| 2800 | outsidePts->push_back(startPt); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2801 | } |
| 2802 | } |
| 2803 | |
| 2804 | void SkOpSegment::undoneSpan(int* start, int* end) { |
| 2805 | size_t tCount = fTs.count(); |
| 2806 | size_t index; |
| 2807 | for (index = 0; index < tCount; ++index) { |
| 2808 | if (!fTs[index].fDone) { |
| 2809 | break; |
| 2810 | } |
| 2811 | } |
| 2812 | SkASSERT(index < tCount - 1); |
| 2813 | *start = index; |
| 2814 | double startT = fTs[index].fT; |
| 2815 | while (approximately_negative(fTs[++index].fT - startT)) |
| 2816 | SkASSERT(index < tCount); |
| 2817 | SkASSERT(index < tCount); |
| 2818 | *end = index; |
| 2819 | } |
| 2820 | |
| 2821 | int SkOpSegment::updateOppWinding(int index, int endIndex) const { |
| 2822 | int lesser = SkMin32(index, endIndex); |
| 2823 | int oppWinding = oppSum(lesser); |
| 2824 | int oppSpanWinding = oppSign(index, endIndex); |
| 2825 | if (oppSpanWinding && UseInnerWinding(oppWinding - oppSpanWinding, oppWinding) |
| 2826 | && oppWinding != SK_MaxS32) { |
| 2827 | oppWinding -= oppSpanWinding; |
| 2828 | } |
| 2829 | return oppWinding; |
| 2830 | } |
| 2831 | |
| 2832 | int SkOpSegment::updateOppWinding(const SkOpAngle* angle) const { |
| 2833 | int startIndex = angle->start(); |
| 2834 | int endIndex = angle->end(); |
| 2835 | return updateOppWinding(endIndex, startIndex); |
| 2836 | } |
| 2837 | |
| 2838 | int SkOpSegment::updateOppWindingReverse(const SkOpAngle* angle) const { |
| 2839 | int startIndex = angle->start(); |
| 2840 | int endIndex = angle->end(); |
| 2841 | return updateOppWinding(startIndex, endIndex); |
| 2842 | } |
| 2843 | |
| 2844 | int SkOpSegment::updateWinding(int index, int endIndex) const { |
| 2845 | int lesser = SkMin32(index, endIndex); |
| 2846 | int winding = windSum(lesser); |
| 2847 | int spanWinding = spanSign(index, endIndex); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2848 | if (winding && UseInnerWinding(winding - spanWinding, winding) |
| 2849 | && winding != SK_MaxS32) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2850 | winding -= spanWinding; |
| 2851 | } |
| 2852 | return winding; |
| 2853 | } |
| 2854 | |
| 2855 | int SkOpSegment::updateWinding(const SkOpAngle* angle) const { |
| 2856 | int startIndex = angle->start(); |
| 2857 | int endIndex = angle->end(); |
| 2858 | return updateWinding(endIndex, startIndex); |
| 2859 | } |
| 2860 | |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2861 | int SkOpSegment::updateWindingReverse(int index, int endIndex) const { |
| 2862 | int lesser = SkMin32(index, endIndex); |
| 2863 | int winding = windSum(lesser); |
| 2864 | int spanWinding = spanSign(endIndex, index); |
| 2865 | if (winding && UseInnerWindingReverse(winding - spanWinding, winding) |
| 2866 | && winding != SK_MaxS32) { |
| 2867 | winding -= spanWinding; |
| 2868 | } |
| 2869 | return winding; |
| 2870 | } |
| 2871 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2872 | int SkOpSegment::updateWindingReverse(const SkOpAngle* angle) const { |
| 2873 | int startIndex = angle->start(); |
| 2874 | int endIndex = angle->end(); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 2875 | return updateWindingReverse(endIndex, startIndex); |
| 2876 | } |
| 2877 | |
| 2878 | // OPTIMIZATION: does the following also work, and is it any faster? |
| 2879 | // return outerWinding * innerWinding > 0 |
| 2880 | // || ((outerWinding + innerWinding < 0) ^ ((outerWinding - innerWinding) < 0))) |
| 2881 | bool SkOpSegment::UseInnerWinding(int outerWinding, int innerWinding) { |
| 2882 | SkASSERT(outerWinding != SK_MaxS32); |
| 2883 | SkASSERT(innerWinding != SK_MaxS32); |
| 2884 | int absOut = abs(outerWinding); |
| 2885 | int absIn = abs(innerWinding); |
| 2886 | bool result = absOut == absIn ? outerWinding < 0 : absOut < absIn; |
| 2887 | return result; |
| 2888 | } |
| 2889 | |
| 2890 | bool SkOpSegment::UseInnerWindingReverse(int outerWinding, int innerWinding) { |
| 2891 | SkASSERT(outerWinding != SK_MaxS32); |
| 2892 | SkASSERT(innerWinding != SK_MaxS32); |
| 2893 | int absOut = abs(outerWinding); |
| 2894 | int absIn = abs(innerWinding); |
| 2895 | bool result = absOut == absIn ? true : absOut < absIn; |
| 2896 | return result; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2897 | } |
| 2898 | |
| 2899 | int SkOpSegment::windingAtT(double tHit, int tIndex, bool crossOpp, SkScalar* dx) const { |
| 2900 | if (approximately_zero(tHit - t(tIndex))) { // if we hit the end of a span, disregard |
| 2901 | return SK_MinS32; |
| 2902 | } |
| 2903 | int winding = crossOpp ? oppSum(tIndex) : windSum(tIndex); |
| 2904 | SkASSERT(winding != SK_MinS32); |
| 2905 | int windVal = crossOpp ? oppValue(tIndex) : windValue(tIndex); |
| 2906 | #if DEBUG_WINDING_AT_T |
| 2907 | SkDebugf("%s oldWinding=%d windValue=%d", __FUNCTION__, winding, windVal); |
| 2908 | #endif |
| 2909 | // see if a + change in T results in a +/- change in X (compute x'(T)) |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 2910 | *dx = (*CurveSlopeAtT[SkPathOpsVerbToPoints(fVerb)])(fPts, tHit).fX; |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2911 | if (fVerb > SkPath::kLine_Verb && approximately_zero(*dx)) { |
| 2912 | *dx = fPts[2].fX - fPts[1].fX - *dx; |
| 2913 | } |
| 2914 | if (*dx == 0) { |
| 2915 | #if DEBUG_WINDING_AT_T |
| 2916 | SkDebugf(" dx=0 winding=SK_MinS32\n"); |
| 2917 | #endif |
| 2918 | return SK_MinS32; |
| 2919 | } |
skia.committer@gmail.com | a4aced4 | 2013-07-09 07:00:56 +0000 | [diff] [blame] | 2920 | if (windVal < 0) { // reverse sign if opp contour traveled in reverse |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 2921 | *dx = -*dx; |
| 2922 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2923 | if (winding * *dx > 0) { // if same signs, result is negative |
| 2924 | winding += *dx > 0 ? -windVal : windVal; |
| 2925 | } |
| 2926 | #if DEBUG_WINDING_AT_T |
| 2927 | SkDebugf(" dx=%c winding=%d\n", *dx > 0 ? '+' : '-', winding); |
| 2928 | #endif |
| 2929 | return winding; |
| 2930 | } |
| 2931 | |
| 2932 | int SkOpSegment::windSum(const SkOpAngle* angle) const { |
| 2933 | int start = angle->start(); |
| 2934 | int end = angle->end(); |
| 2935 | int index = SkMin32(start, end); |
| 2936 | return windSum(index); |
| 2937 | } |
| 2938 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2939 | void SkOpSegment::zeroSpan(SkOpSpan* span) { |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 2940 | SkASSERT(span->fWindValue > 0 || span->fOppValue != 0); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2941 | span->fWindValue = 0; |
| 2942 | span->fOppValue = 0; |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2943 | if (span->fTiny || span->fSmall) { |
| 2944 | return; |
| 2945 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2946 | SkASSERT(!span->fDone); |
| 2947 | span->fDone = true; |
| 2948 | ++fDoneSpans; |
| 2949 | } |
skia.committer@gmail.com | 3284017 | 2013-04-09 07:01:27 +0000 | [diff] [blame] | 2950 | |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2951 | #if DEBUG_SWAP_TOP |
| 2952 | bool SkOpSegment::controlsContainedByEnds(int tStart, int tEnd) const { |
| 2953 | if (fVerb != SkPath::kCubic_Verb) { |
| 2954 | return false; |
| 2955 | } |
| 2956 | SkDCubic dst = SkDCubic::SubDivide(fPts, fTs[tStart].fT, fTs[tEnd].fT); |
| 2957 | return dst.controlsContainedByEnds(); |
| 2958 | } |
| 2959 | #endif |
| 2960 | |
| 2961 | #if DEBUG_CONCIDENT |
| 2962 | // SkASSERT if pair has not already been added |
| 2963 | void SkOpSegment::debugAddTPair(double t, const SkOpSegment& other, double otherT) const { |
| 2964 | for (int i = 0; i < fTs.count(); ++i) { |
| 2965 | if (fTs[i].fT == t && fTs[i].fOther == &other && fTs[i].fOtherT == otherT) { |
| 2966 | return; |
| 2967 | } |
| 2968 | } |
| 2969 | SkASSERT(0); |
| 2970 | } |
| 2971 | #endif |
| 2972 | |
| 2973 | #if DEBUG_CONCIDENT |
caryclark@google.com | 7eaa53d | 2013-10-02 14:49:34 +0000 | [diff] [blame] | 2974 | void SkOpSegment::debugShowTs(const char* prefix) const { |
| 2975 | SkDebugf("%s %s id=%d", __FUNCTION__, prefix, fID); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 2976 | int lastWind = -1; |
| 2977 | int lastOpp = -1; |
| 2978 | double lastT = -1; |
| 2979 | int i; |
| 2980 | for (i = 0; i < fTs.count(); ++i) { |
| 2981 | bool change = lastT != fTs[i].fT || lastWind != fTs[i].fWindValue |
| 2982 | || lastOpp != fTs[i].fOppValue; |
| 2983 | if (change && lastWind >= 0) { |
| 2984 | SkDebugf(" t=%1.3g %1.9g,%1.9g w=%d o=%d]", |
| 2985 | lastT, xyAtT(i - 1).fX, xyAtT(i - 1).fY, lastWind, lastOpp); |
| 2986 | } |
| 2987 | if (change) { |
| 2988 | SkDebugf(" [o=%d", fTs[i].fOther->fID); |
| 2989 | lastWind = fTs[i].fWindValue; |
| 2990 | lastOpp = fTs[i].fOppValue; |
| 2991 | lastT = fTs[i].fT; |
| 2992 | } else { |
| 2993 | SkDebugf(",%d", fTs[i].fOther->fID); |
| 2994 | } |
| 2995 | } |
| 2996 | if (i <= 0) { |
| 2997 | return; |
| 2998 | } |
| 2999 | SkDebugf(" t=%1.3g %1.9g,%1.9g w=%d o=%d]", |
| 3000 | lastT, xyAtT(i - 1).fX, xyAtT(i - 1).fY, lastWind, lastOpp); |
| 3001 | if (fOperand) { |
| 3002 | SkDebugf(" operand"); |
| 3003 | } |
| 3004 | if (done()) { |
| 3005 | SkDebugf(" done"); |
| 3006 | } |
| 3007 | SkDebugf("\n"); |
| 3008 | } |
| 3009 | #endif |
| 3010 | |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 3011 | #if DEBUG_ACTIVE_SPANS || DEBUG_ACTIVE_SPANS_FIRST_ONLY |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3012 | void SkOpSegment::debugShowActiveSpans() const { |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 3013 | debugValidate(); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3014 | if (done()) { |
| 3015 | return; |
| 3016 | } |
| 3017 | #if DEBUG_ACTIVE_SPANS_SHORT_FORM |
| 3018 | int lastId = -1; |
| 3019 | double lastT = -1; |
| 3020 | #endif |
| 3021 | for (int i = 0; i < fTs.count(); ++i) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3022 | if (fTs[i].fDone) { |
| 3023 | continue; |
| 3024 | } |
caryclark@google.com | a5e5592 | 2013-05-07 18:51:31 +0000 | [diff] [blame] | 3025 | SkASSERT(i < fTs.count() - 1); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3026 | #if DEBUG_ACTIVE_SPANS_SHORT_FORM |
| 3027 | if (lastId == fID && lastT == fTs[i].fT) { |
| 3028 | continue; |
| 3029 | } |
| 3030 | lastId = fID; |
| 3031 | lastT = fTs[i].fT; |
| 3032 | #endif |
| 3033 | SkDebugf("%s id=%d", __FUNCTION__, fID); |
| 3034 | SkDebugf(" (%1.9g,%1.9g", fPts[0].fX, fPts[0].fY); |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 3035 | for (int vIndex = 1; vIndex <= SkPathOpsVerbToPoints(fVerb); ++vIndex) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3036 | SkDebugf(" %1.9g,%1.9g", fPts[vIndex].fX, fPts[vIndex].fY); |
| 3037 | } |
| 3038 | const SkOpSpan* span = &fTs[i]; |
| 3039 | SkDebugf(") t=%1.9g (%1.9g,%1.9g)", span->fT, xAtT(span), yAtT(span)); |
| 3040 | int iEnd = i + 1; |
| 3041 | while (fTs[iEnd].fT < 1 && approximately_equal(fTs[i].fT, fTs[iEnd].fT)) { |
| 3042 | ++iEnd; |
| 3043 | } |
| 3044 | SkDebugf(" tEnd=%1.9g", fTs[iEnd].fT); |
| 3045 | const SkOpSegment* other = fTs[i].fOther; |
| 3046 | SkDebugf(" other=%d otherT=%1.9g otherIndex=%d windSum=", |
| 3047 | other->fID, fTs[i].fOtherT, fTs[i].fOtherIndex); |
| 3048 | if (fTs[i].fWindSum == SK_MinS32) { |
| 3049 | SkDebugf("?"); |
| 3050 | } else { |
| 3051 | SkDebugf("%d", fTs[i].fWindSum); |
| 3052 | } |
| 3053 | SkDebugf(" windValue=%d oppValue=%d\n", fTs[i].fWindValue, fTs[i].fOppValue); |
| 3054 | } |
| 3055 | } |
| 3056 | #endif |
| 3057 | |
| 3058 | |
| 3059 | #if DEBUG_MARK_DONE || DEBUG_UNSORTABLE |
| 3060 | void SkOpSegment::debugShowNewWinding(const char* fun, const SkOpSpan& span, int winding) { |
| 3061 | const SkPoint& pt = xyAtT(&span); |
| 3062 | SkDebugf("%s id=%d", fun, fID); |
| 3063 | SkDebugf(" (%1.9g,%1.9g", fPts[0].fX, fPts[0].fY); |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 3064 | for (int vIndex = 1; vIndex <= SkPathOpsVerbToPoints(fVerb); ++vIndex) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3065 | SkDebugf(" %1.9g,%1.9g", fPts[vIndex].fX, fPts[vIndex].fY); |
| 3066 | } |
| 3067 | SkASSERT(&span == &span.fOther->fTs[span.fOtherIndex].fOther-> |
| 3068 | fTs[span.fOther->fTs[span.fOtherIndex].fOtherIndex]); |
| 3069 | SkDebugf(") t=%1.9g [%d] (%1.9g,%1.9g) tEnd=%1.9g newWindSum=%d windSum=", |
| 3070 | span.fT, span.fOther->fTs[span.fOtherIndex].fOtherIndex, pt.fX, pt.fY, |
| 3071 | (&span)[1].fT, winding); |
| 3072 | if (span.fWindSum == SK_MinS32) { |
| 3073 | SkDebugf("?"); |
| 3074 | } else { |
| 3075 | SkDebugf("%d", span.fWindSum); |
| 3076 | } |
| 3077 | SkDebugf(" windValue=%d\n", span.fWindValue); |
| 3078 | } |
| 3079 | |
| 3080 | void SkOpSegment::debugShowNewWinding(const char* fun, const SkOpSpan& span, int winding, |
| 3081 | int oppWinding) { |
| 3082 | const SkPoint& pt = xyAtT(&span); |
| 3083 | SkDebugf("%s id=%d", fun, fID); |
| 3084 | SkDebugf(" (%1.9g,%1.9g", fPts[0].fX, fPts[0].fY); |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 3085 | for (int vIndex = 1; vIndex <= SkPathOpsVerbToPoints(fVerb); ++vIndex) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3086 | SkDebugf(" %1.9g,%1.9g", fPts[vIndex].fX, fPts[vIndex].fY); |
| 3087 | } |
| 3088 | SkASSERT(&span == &span.fOther->fTs[span.fOtherIndex].fOther-> |
| 3089 | fTs[span.fOther->fTs[span.fOtherIndex].fOtherIndex]); |
| 3090 | SkDebugf(") t=%1.9g [%d] (%1.9g,%1.9g) tEnd=%1.9g newWindSum=%d newOppSum=%d oppSum=", |
| 3091 | span.fT, span.fOther->fTs[span.fOtherIndex].fOtherIndex, pt.fX, pt.fY, |
| 3092 | (&span)[1].fT, winding, oppWinding); |
| 3093 | if (span.fOppSum == SK_MinS32) { |
| 3094 | SkDebugf("?"); |
| 3095 | } else { |
| 3096 | SkDebugf("%d", span.fOppSum); |
| 3097 | } |
| 3098 | SkDebugf(" windSum="); |
| 3099 | if (span.fWindSum == SK_MinS32) { |
| 3100 | SkDebugf("?"); |
| 3101 | } else { |
| 3102 | SkDebugf("%d", span.fWindSum); |
| 3103 | } |
| 3104 | SkDebugf(" windValue=%d\n", span.fWindValue); |
| 3105 | } |
| 3106 | #endif |
| 3107 | |
| 3108 | #if DEBUG_SORT || DEBUG_SWAP_TOP |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 3109 | void SkOpSegment::debugShowSort(const char* fun, const SkTArray<SkOpAngle*, true>& angles, |
| 3110 | int first, const int contourWinding, |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 3111 | const int oppContourWinding, bool sortable) const { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3112 | if (--SkPathOpsDebug::gSortCount < 0) { |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3113 | return; |
| 3114 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3115 | if (!sortable) { |
| 3116 | if (angles.count() == 0) { |
| 3117 | return; |
| 3118 | } |
| 3119 | if (first < 0) { |
| 3120 | first = 0; |
| 3121 | } |
| 3122 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3123 | SkASSERT(angles[first]->segment() == this); |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 3124 | SkASSERT(!sortable || angles.count() > 1); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3125 | int lastSum = contourWinding; |
| 3126 | int oppLastSum = oppContourWinding; |
| 3127 | const SkOpAngle* firstAngle = angles[first]; |
| 3128 | int windSum = lastSum - spanSign(firstAngle); |
| 3129 | int oppoSign = oppSign(firstAngle); |
| 3130 | int oppWindSum = oppLastSum - oppoSign; |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3131 | #define WIND_AS_STRING(x) char x##Str[12]; \ |
| 3132 | if (!SkPathOpsDebug::ValidWind(x)) strcpy(x##Str, "?"); \ |
| 3133 | else SK_SNPRINTF(x##Str, sizeof(x##Str), "%d", x) |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3134 | WIND_AS_STRING(contourWinding); |
| 3135 | WIND_AS_STRING(oppContourWinding); |
| 3136 | SkDebugf("%s %s contourWinding=%s oppContourWinding=%s sign=%d\n", fun, __FUNCTION__, |
| 3137 | contourWindingStr, oppContourWindingStr, spanSign(angles[first])); |
| 3138 | int index = first; |
| 3139 | bool firstTime = true; |
| 3140 | do { |
| 3141 | const SkOpAngle& angle = *angles[index]; |
| 3142 | const SkOpSegment& segment = *angle.segment(); |
| 3143 | int start = angle.start(); |
| 3144 | int end = angle.end(); |
| 3145 | const SkOpSpan& sSpan = segment.fTs[start]; |
| 3146 | const SkOpSpan& eSpan = segment.fTs[end]; |
| 3147 | const SkOpSpan& mSpan = segment.fTs[SkMin32(start, end)]; |
| 3148 | bool opp = segment.fOperand ^ fOperand; |
| 3149 | if (!firstTime) { |
| 3150 | oppoSign = segment.oppSign(&angle); |
| 3151 | if (opp) { |
| 3152 | oppLastSum = oppWindSum; |
| 3153 | oppWindSum -= segment.spanSign(&angle); |
| 3154 | if (oppoSign) { |
| 3155 | lastSum = windSum; |
| 3156 | windSum -= oppoSign; |
| 3157 | } |
| 3158 | } else { |
| 3159 | lastSum = windSum; |
| 3160 | windSum -= segment.spanSign(&angle); |
| 3161 | if (oppoSign) { |
| 3162 | oppLastSum = oppWindSum; |
| 3163 | oppWindSum -= oppoSign; |
| 3164 | } |
| 3165 | } |
| 3166 | } |
| 3167 | SkDebugf("%s [%d] %s", __FUNCTION__, index, |
| 3168 | angle.unsortable() ? "*** UNSORTABLE *** " : ""); |
caryclark@google.com | cffbcc3 | 2013-06-04 17:59:42 +0000 | [diff] [blame] | 3169 | #if DEBUG_SORT_COMPACT |
| 3170 | SkDebugf("id=%d %s start=%d (%1.9g,%1.9g) end=%d (%1.9g,%1.9g)", |
reed@google.com | 277c3f8 | 2013-05-31 15:17:50 +0000 | [diff] [blame] | 3171 | segment.fID, kLVerbStr[SkPathOpsVerbToPoints(segment.fVerb)], |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3172 | start, segment.xAtT(&sSpan), segment.yAtT(&sSpan), end, |
| 3173 | segment.xAtT(&eSpan), segment.yAtT(&eSpan)); |
| 3174 | #else |
| 3175 | switch (segment.fVerb) { |
| 3176 | case SkPath::kLine_Verb: |
| 3177 | SkDebugf(LINE_DEBUG_STR, LINE_DEBUG_DATA(segment.fPts)); |
| 3178 | break; |
| 3179 | case SkPath::kQuad_Verb: |
| 3180 | SkDebugf(QUAD_DEBUG_STR, QUAD_DEBUG_DATA(segment.fPts)); |
| 3181 | break; |
| 3182 | case SkPath::kCubic_Verb: |
| 3183 | SkDebugf(CUBIC_DEBUG_STR, CUBIC_DEBUG_DATA(segment.fPts)); |
| 3184 | break; |
| 3185 | default: |
| 3186 | SkASSERT(0); |
| 3187 | } |
| 3188 | SkDebugf(" tStart=%1.9g tEnd=%1.9g", sSpan.fT, eSpan.fT); |
| 3189 | #endif |
| 3190 | SkDebugf(" sign=%d windValue=%d windSum=", angle.sign(), mSpan.fWindValue); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3191 | SkPathOpsDebug::WindingPrintf(mSpan.fWindSum); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3192 | int last, wind; |
| 3193 | if (opp) { |
| 3194 | last = oppLastSum; |
| 3195 | wind = oppWindSum; |
| 3196 | } else { |
| 3197 | last = lastSum; |
| 3198 | wind = windSum; |
| 3199 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3200 | bool useInner = SkPathOpsDebug::ValidWind(last) && SkPathOpsDebug::ValidWind(wind) |
| 3201 | && UseInnerWinding(last, wind); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3202 | WIND_AS_STRING(last); |
| 3203 | WIND_AS_STRING(wind); |
| 3204 | WIND_AS_STRING(lastSum); |
| 3205 | WIND_AS_STRING(oppLastSum); |
| 3206 | WIND_AS_STRING(windSum); |
| 3207 | WIND_AS_STRING(oppWindSum); |
| 3208 | #undef WIND_AS_STRING |
| 3209 | if (!oppoSign) { |
| 3210 | SkDebugf(" %s->%s (max=%s)", lastStr, windStr, useInner ? windStr : lastStr); |
| 3211 | } else { |
| 3212 | SkDebugf(" %s->%s (%s->%s)", lastStr, windStr, opp ? lastSumStr : oppLastSumStr, |
| 3213 | opp ? windSumStr : oppWindSumStr); |
| 3214 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3215 | SkDebugf(" done=%d unord=%d small=%d tiny=%d opp=%d\n", |
| 3216 | mSpan.fDone, angle.unorderable(), mSpan.fSmall, mSpan.fTiny, opp); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3217 | ++index; |
| 3218 | if (index == angles.count()) { |
| 3219 | index = 0; |
| 3220 | } |
| 3221 | if (firstTime) { |
| 3222 | firstTime = false; |
| 3223 | } |
| 3224 | } while (index != first); |
| 3225 | } |
| 3226 | |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 3227 | void SkOpSegment::debugShowSort(const char* fun, const SkTArray<SkOpAngle*, true>& angles, |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 3228 | int first, bool sortable) { |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3229 | if (!sortable) { |
| 3230 | if (angles.count() == 0) { |
| 3231 | return; |
| 3232 | } |
| 3233 | if (first < 0) { |
| 3234 | first = 0; |
| 3235 | } |
| 3236 | } |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3237 | const SkOpAngle* firstAngle = angles[first]; |
| 3238 | const SkOpSegment* segment = firstAngle->segment(); |
| 3239 | int winding = segment->updateWinding(firstAngle); |
| 3240 | int oppWinding = segment->updateOppWinding(firstAngle); |
caryclark@google.com | 07e97fc | 2013-07-08 17:17:02 +0000 | [diff] [blame] | 3241 | debugShowSort(fun, angles, first, winding, oppWinding, sortable); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3242 | } |
| 3243 | |
| 3244 | #endif |
| 3245 | |
| 3246 | #if DEBUG_SHOW_WINDING |
| 3247 | int SkOpSegment::debugShowWindingValues(int slotCount, int ofInterest) const { |
| 3248 | if (!(1 << fID & ofInterest)) { |
| 3249 | return 0; |
| 3250 | } |
| 3251 | int sum = 0; |
caryclark@google.com | d892bd8 | 2013-06-17 14:10:36 +0000 | [diff] [blame] | 3252 | SkTArray<char, true> slots(slotCount * 2); |
caryclark@google.com | 07393ca | 2013-04-08 11:47:37 +0000 | [diff] [blame] | 3253 | memset(slots.begin(), ' ', slotCount * 2); |
| 3254 | for (int i = 0; i < fTs.count(); ++i) { |
| 3255 | // if (!(1 << fTs[i].fOther->fID & ofInterest)) { |
| 3256 | // continue; |
| 3257 | // } |
| 3258 | sum += fTs[i].fWindValue; |
| 3259 | slots[fTs[i].fOther->fID - 1] = as_digit(fTs[i].fWindValue); |
| 3260 | sum += fTs[i].fOppValue; |
| 3261 | slots[slotCount + fTs[i].fOther->fID - 1] = as_digit(fTs[i].fOppValue); |
| 3262 | } |
| 3263 | SkDebugf("%s id=%2d %.*s | %.*s\n", __FUNCTION__, fID, slotCount, slots.begin(), slotCount, |
| 3264 | slots.begin() + slotCount); |
| 3265 | return sum; |
| 3266 | } |
| 3267 | #endif |
caryclark@google.com | 4fdbb22 | 2013-07-23 15:27:41 +0000 | [diff] [blame] | 3268 | |
| 3269 | void SkOpSegment::debugValidate() const { |
| 3270 | #if DEBUG_VALIDATE |
| 3271 | int count = fTs.count(); |
| 3272 | SkASSERT(count >= 2); |
| 3273 | SkASSERT(fTs[0].fT == 0); |
| 3274 | SkASSERT(fTs[count - 1].fT == 1); |
| 3275 | int done = 0; |
| 3276 | double t = -1; |
| 3277 | for (int i = 0; i < count; ++i) { |
| 3278 | const SkOpSpan& span = fTs[i]; |
| 3279 | SkASSERT(t <= span.fT); |
| 3280 | t = span.fT; |
| 3281 | int otherIndex = span.fOtherIndex; |
| 3282 | const SkOpSegment* other = span.fOther; |
| 3283 | const SkOpSpan& otherSpan = other->fTs[otherIndex]; |
| 3284 | SkASSERT(otherSpan.fPt == span.fPt); |
| 3285 | SkASSERT(otherSpan.fOtherT == t); |
| 3286 | SkASSERT(&fTs[i] == &otherSpan.fOther->fTs[otherSpan.fOtherIndex]); |
| 3287 | done += span.fDone; |
| 3288 | } |
| 3289 | SkASSERT(done == fDoneSpans); |
| 3290 | #endif |
| 3291 | } |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3292 | |
| 3293 | #ifdef SK_DEBUG |
| 3294 | void SkOpSegment::dumpPts() const { |
| 3295 | int last = SkPathOpsVerbToPoints(fVerb); |
| 3296 | SkDebugf("{{"); |
| 3297 | int index = 0; |
| 3298 | do { |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 3299 | SkDPoint::dump(fPts[index]); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3300 | SkDebugf(", "); |
| 3301 | } while (++index < last); |
caryclark@google.com | a2bbc6e | 2013-11-01 17:36:03 +0000 | [diff] [blame] | 3302 | SkDPoint::dump(fPts[index]); |
caryclark@google.com | 570863f | 2013-09-16 15:55:01 +0000 | [diff] [blame] | 3303 | SkDebugf("}}\n"); |
| 3304 | } |
| 3305 | |
| 3306 | void SkOpSegment::dumpDPts() const { |
| 3307 | int count = SkPathOpsVerbToPoints(fVerb); |
| 3308 | SkDebugf("{{"); |
| 3309 | int index = 0; |
| 3310 | do { |
| 3311 | SkDPoint dPt = {fPts[index].fX, fPts[index].fY}; |
| 3312 | dPt.dump(); |
| 3313 | if (index != count) { |
| 3314 | SkDebugf(", "); |
| 3315 | } |
| 3316 | } while (++index <= count); |
| 3317 | SkDebugf("}}\n"); |
| 3318 | } |
| 3319 | |
| 3320 | void SkOpSegment::dumpSpans() const { |
| 3321 | int count = this->count(); |
| 3322 | for (int index = 0; index < count; ++index) { |
| 3323 | const SkOpSpan& span = this->span(index); |
| 3324 | SkDebugf("[%d] ", index); |
| 3325 | span.dump(); |
| 3326 | } |
| 3327 | } |
| 3328 | #endif |