reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
| 8 | |
| 9 | #include "SkAAClip.h" |
| 10 | #include "SkBlitter.h" |
| 11 | #include "SkPath.h" |
| 12 | #include "SkScan.h" |
| 13 | #include "SkThread.h" |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 14 | #include "SkUtils.h" |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 15 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 16 | #define kMaxInt32 0x7FFFFFFF |
| 17 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 18 | static inline bool x_in_rect(int x, const SkIRect& rect) { |
| 19 | return (unsigned)(x - rect.fLeft) < (unsigned)rect.width(); |
| 20 | } |
| 21 | |
| 22 | static inline bool y_in_rect(int y, const SkIRect& rect) { |
| 23 | return (unsigned)(y - rect.fTop) < (unsigned)rect.height(); |
| 24 | } |
| 25 | |
| 26 | /* |
| 27 | * Data runs are packed [count, alpha] |
| 28 | */ |
| 29 | |
| 30 | struct SkAAClip::YOffset { |
| 31 | int32_t fY; |
| 32 | uint32_t fOffset; |
| 33 | }; |
| 34 | |
| 35 | struct SkAAClip::RunHead { |
| 36 | int32_t fRefCnt; |
| 37 | int32_t fRowCount; |
| 38 | int32_t fDataSize; |
| 39 | |
| 40 | YOffset* yoffsets() { |
| 41 | return (YOffset*)((char*)this + sizeof(RunHead)); |
| 42 | } |
| 43 | const YOffset* yoffsets() const { |
| 44 | return (const YOffset*)((const char*)this + sizeof(RunHead)); |
| 45 | } |
| 46 | uint8_t* data() { |
| 47 | return (uint8_t*)(this->yoffsets() + fRowCount); |
| 48 | } |
| 49 | const uint8_t* data() const { |
| 50 | return (const uint8_t*)(this->yoffsets() + fRowCount); |
| 51 | } |
| 52 | |
| 53 | static RunHead* Alloc(int rowCount, size_t dataSize) { |
| 54 | size_t size = sizeof(RunHead) + rowCount * sizeof(YOffset) + dataSize; |
| 55 | RunHead* head = (RunHead*)sk_malloc_throw(size); |
| 56 | head->fRefCnt = 1; |
| 57 | head->fRowCount = rowCount; |
| 58 | head->fDataSize = dataSize; |
| 59 | return head; |
| 60 | } |
| 61 | }; |
| 62 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 63 | class SkAAClip::Iter { |
| 64 | public: |
| 65 | Iter(const SkAAClip&); |
| 66 | |
| 67 | bool done() const { return fDone; } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 68 | int top() const { return fTop; } |
| 69 | int bottom() const { return fBottom; } |
| 70 | const uint8_t* data() const { return fData; } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 71 | void next(); |
| 72 | |
| 73 | private: |
| 74 | const YOffset* fCurrYOff; |
| 75 | const YOffset* fStopYOff; |
| 76 | const uint8_t* fData; |
| 77 | |
| 78 | int fTop, fBottom; |
| 79 | bool fDone; |
| 80 | }; |
| 81 | |
| 82 | SkAAClip::Iter::Iter(const SkAAClip& clip) { |
| 83 | if (clip.isEmpty()) { |
| 84 | fDone = true; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 85 | fTop = fBottom = clip.fBounds.fBottom; |
| 86 | fData = NULL; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 87 | return; |
| 88 | } |
| 89 | |
| 90 | const RunHead* head = clip.fRunHead; |
| 91 | fCurrYOff = head->yoffsets(); |
| 92 | fStopYOff = fCurrYOff + head->fRowCount; |
| 93 | fData = head->data() + fCurrYOff->fOffset; |
| 94 | |
| 95 | // setup first value |
| 96 | fTop = clip.fBounds.fTop; |
| 97 | fBottom = clip.fBounds.fTop + fCurrYOff->fY + 1; |
| 98 | fDone = false; |
| 99 | } |
| 100 | |
| 101 | void SkAAClip::Iter::next() { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 102 | if (!fDone) { |
| 103 | const YOffset* prev = fCurrYOff; |
| 104 | const YOffset* curr = prev + 1; |
| 105 | SkASSERT(curr <= fStopYOff); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 106 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 107 | fTop = fBottom; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 108 | if (curr >= fStopYOff) { |
| 109 | fDone = true; |
| 110 | fBottom = kMaxInt32; |
| 111 | fData = NULL; |
| 112 | } else { |
| 113 | fBottom += curr->fY - prev->fY; |
| 114 | fData += curr->fOffset - prev->fOffset; |
| 115 | fCurrYOff = curr; |
| 116 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 117 | } |
| 118 | } |
| 119 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 120 | /////////////////////////////////////////////////////////////////////////////// |
| 121 | |
| 122 | void SkAAClip::freeRuns() { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 123 | if (fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 124 | SkASSERT(fRunHead->fRefCnt >= 1); |
| 125 | if (1 == sk_atomic_dec(&fRunHead->fRefCnt)) { |
| 126 | sk_free(fRunHead); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | SkAAClip::SkAAClip() { |
| 132 | fBounds.setEmpty(); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 133 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | SkAAClip::SkAAClip(const SkAAClip& src) { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 137 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 138 | *this = src; |
| 139 | } |
| 140 | |
| 141 | SkAAClip::~SkAAClip() { |
| 142 | this->freeRuns(); |
| 143 | } |
| 144 | |
| 145 | SkAAClip& SkAAClip::operator=(const SkAAClip& src) { |
| 146 | if (this != &src) { |
| 147 | this->freeRuns(); |
| 148 | fBounds = src.fBounds; |
| 149 | fRunHead = src.fRunHead; |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 150 | if (fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 151 | sk_atomic_inc(&fRunHead->fRefCnt); |
| 152 | } |
| 153 | } |
| 154 | return *this; |
| 155 | } |
| 156 | |
| 157 | bool operator==(const SkAAClip& a, const SkAAClip& b) { |
| 158 | if (&a == &b) { |
| 159 | return true; |
| 160 | } |
| 161 | if (a.fBounds != b.fBounds) { |
| 162 | return false; |
| 163 | } |
| 164 | |
| 165 | const SkAAClip::RunHead* ah = a.fRunHead; |
| 166 | const SkAAClip::RunHead* bh = b.fRunHead; |
| 167 | |
| 168 | // this catches empties and rects being equal |
| 169 | if (ah == bh) { |
| 170 | return true; |
| 171 | } |
| 172 | |
| 173 | // now we insist that both are complex (but different ptrs) |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 174 | if (!a.fRunHead || !b.fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 175 | return false; |
| 176 | } |
| 177 | |
| 178 | return ah->fRowCount == bh->fRowCount && |
| 179 | ah->fDataSize == bh->fDataSize && |
| 180 | !memcmp(ah->data(), bh->data(), ah->fDataSize); |
| 181 | } |
| 182 | |
| 183 | void SkAAClip::swap(SkAAClip& other) { |
| 184 | SkTSwap(fBounds, other.fBounds); |
| 185 | SkTSwap(fRunHead, other.fRunHead); |
| 186 | } |
| 187 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 188 | bool SkAAClip::set(const SkAAClip& src) { |
| 189 | *this = src; |
| 190 | return !this->isEmpty(); |
| 191 | } |
| 192 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 193 | bool SkAAClip::setEmpty() { |
| 194 | this->freeRuns(); |
| 195 | fBounds.setEmpty(); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 196 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 197 | return false; |
| 198 | } |
| 199 | |
| 200 | bool SkAAClip::setRect(const SkIRect& bounds) { |
| 201 | if (bounds.isEmpty()) { |
| 202 | return this->setEmpty(); |
| 203 | } |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 204 | |
| 205 | // TODO: special case this |
| 206 | |
| 207 | SkRect r; |
| 208 | r.set(bounds); |
| 209 | SkPath path; |
| 210 | path.addRect(r); |
| 211 | return this->setPath(path); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 212 | } |
| 213 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 214 | bool SkAAClip::setRect(const SkRect& r, bool doAA) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 215 | if (r.isEmpty()) { |
| 216 | return this->setEmpty(); |
| 217 | } |
| 218 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 219 | SkPath path; |
| 220 | path.addRect(r); |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 221 | return this->setPath(path, NULL, doAA); |
| 222 | } |
| 223 | |
| 224 | bool SkAAClip::setRegion(const SkRegion& rgn) { |
| 225 | if (rgn.isEmpty()) { |
| 226 | return this->setEmpty(); |
| 227 | } |
| 228 | if (rgn.isRect()) { |
| 229 | return this->setRect(rgn.getBounds()); |
| 230 | } |
| 231 | |
| 232 | SkAAClip clip; |
| 233 | SkRegion::Iterator iter(rgn); |
| 234 | for (; !iter.done(); iter.next()) { |
| 235 | clip.op(iter.rect(), SkRegion::kUnion_Op); |
| 236 | } |
| 237 | this->swap(clip); |
reed@google.com | 3771a03 | 2011-10-11 17:18:04 +0000 | [diff] [blame] | 238 | return !this->isEmpty(); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | /////////////////////////////////////////////////////////////////////////////// |
| 242 | |
| 243 | const uint8_t* SkAAClip::findRow(int y, int* lastYForRow) const { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 244 | SkASSERT(fRunHead); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 245 | |
| 246 | if (!y_in_rect(y, fBounds)) { |
| 247 | return NULL; |
| 248 | } |
| 249 | y -= fBounds.y(); // our yoffs values are relative to the top |
| 250 | |
| 251 | const YOffset* yoff = fRunHead->yoffsets(); |
| 252 | while (yoff->fY < y) { |
| 253 | yoff += 1; |
| 254 | SkASSERT(yoff - fRunHead->yoffsets() < fRunHead->fRowCount); |
| 255 | } |
| 256 | |
| 257 | if (lastYForRow) { |
| 258 | *lastYForRow = yoff->fY; |
| 259 | } |
| 260 | return fRunHead->data() + yoff->fOffset; |
| 261 | } |
| 262 | |
| 263 | const uint8_t* SkAAClip::findX(const uint8_t data[], int x, int* initialCount) const { |
| 264 | SkASSERT(x_in_rect(x, fBounds)); |
| 265 | x -= fBounds.x(); |
| 266 | |
| 267 | // first skip up to X |
| 268 | for (;;) { |
| 269 | int n = data[0]; |
| 270 | if (x < n) { |
| 271 | *initialCount = n - x; |
| 272 | break; |
| 273 | } |
| 274 | data += 2; |
| 275 | x -= n; |
| 276 | } |
| 277 | return data; |
| 278 | } |
| 279 | |
| 280 | bool SkAAClip::quickContains(int left, int top, int right, int bottom) const { |
| 281 | if (this->isEmpty()) { |
| 282 | return false; |
| 283 | } |
| 284 | if (!fBounds.contains(left, top, right, bottom)) { |
| 285 | return false; |
| 286 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 287 | #if 0 |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 288 | if (this->isRect()) { |
| 289 | return true; |
| 290 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 291 | #endif |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 292 | |
| 293 | int lastY; |
| 294 | const uint8_t* row = this->findRow(top, &lastY); |
| 295 | if (lastY < bottom) { |
| 296 | return false; |
| 297 | } |
| 298 | // now just need to check in X |
| 299 | int initialCount; |
| 300 | row = this->findX(row, left, &initialCount); |
| 301 | return initialCount >= (right - left) && 0xFF == row[1]; |
| 302 | } |
| 303 | |
| 304 | /////////////////////////////////////////////////////////////////////////////// |
| 305 | |
| 306 | class SkAAClip::Builder { |
| 307 | SkIRect fBounds; |
| 308 | struct Row { |
| 309 | int fY; |
| 310 | int fWidth; |
| 311 | SkTDArray<uint8_t>* fData; |
| 312 | }; |
| 313 | SkTDArray<Row> fRows; |
| 314 | Row* fCurrRow; |
| 315 | int fPrevY; |
| 316 | int fWidth; |
| 317 | |
| 318 | public: |
| 319 | Builder(const SkIRect& bounds) : fBounds(bounds) { |
| 320 | fPrevY = -1; |
| 321 | fWidth = bounds.width(); |
| 322 | fCurrRow = NULL; |
| 323 | } |
| 324 | |
| 325 | ~Builder() { |
| 326 | Row* row = fRows.begin(); |
| 327 | Row* stop = fRows.end(); |
| 328 | while (row < stop) { |
| 329 | delete row->fData; |
| 330 | row += 1; |
| 331 | } |
| 332 | } |
| 333 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 334 | const SkIRect& getBounds() const { return fBounds; } |
| 335 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 336 | void addRun(int x, int y, U8CPU alpha, int count) { |
| 337 | SkASSERT(count > 0); |
| 338 | SkASSERT(fBounds.contains(x, y)); |
| 339 | SkASSERT(fBounds.contains(x + count - 1, y)); |
| 340 | |
| 341 | x -= fBounds.left(); |
| 342 | y -= fBounds.top(); |
| 343 | |
| 344 | Row* row = fCurrRow; |
| 345 | if (y != fPrevY) { |
| 346 | SkASSERT(y > fPrevY); |
| 347 | fPrevY = y; |
| 348 | row = this->flushRow(true); |
| 349 | row->fY = y; |
| 350 | row->fWidth = 0; |
| 351 | SkASSERT(row->fData); |
| 352 | SkASSERT(0 == row->fData->count()); |
| 353 | fCurrRow = row; |
| 354 | } |
| 355 | |
| 356 | SkASSERT(row->fWidth <= x); |
| 357 | SkASSERT(row->fWidth < fBounds.width()); |
| 358 | |
| 359 | SkTDArray<uint8_t>& data = *row->fData; |
| 360 | |
| 361 | int gap = x - row->fWidth; |
| 362 | if (gap) { |
| 363 | AppendRun(data, 0, gap); |
| 364 | row->fWidth += gap; |
| 365 | SkASSERT(row->fWidth < fBounds.width()); |
| 366 | } |
| 367 | |
| 368 | AppendRun(data, alpha, count); |
| 369 | row->fWidth += count; |
| 370 | SkASSERT(row->fWidth <= fBounds.width()); |
| 371 | } |
| 372 | |
| 373 | RunHead* finish() { |
| 374 | this->flushRow(false); |
| 375 | |
| 376 | const Row* row = fRows.begin(); |
| 377 | const Row* stop = fRows.end(); |
| 378 | |
| 379 | size_t dataSize = 0; |
| 380 | while (row < stop) { |
| 381 | dataSize += row->fData->count(); |
| 382 | row += 1; |
| 383 | } |
| 384 | |
| 385 | RunHead* head = RunHead::Alloc(fRows.count(), dataSize); |
| 386 | YOffset* yoffset = head->yoffsets(); |
| 387 | uint8_t* data = head->data(); |
| 388 | uint8_t* baseData = data; |
| 389 | |
| 390 | row = fRows.begin(); |
| 391 | while (row < stop) { |
| 392 | yoffset->fY = row->fY; |
| 393 | yoffset->fOffset = data - baseData; |
| 394 | yoffset += 1; |
| 395 | |
| 396 | size_t n = row->fData->count(); |
| 397 | memcpy(data, row->fData->begin(), n); |
| 398 | data += n; |
| 399 | |
| 400 | row += 1; |
| 401 | } |
| 402 | |
| 403 | return head; |
| 404 | } |
| 405 | |
| 406 | void dump() { |
| 407 | this->validate(); |
| 408 | int y; |
| 409 | for (y = 0; y < fRows.count(); ++y) { |
| 410 | const Row& row = fRows[y]; |
| 411 | SkDebugf("Y:%3d W:%3d", row.fY, row.fWidth); |
| 412 | const SkTDArray<uint8_t>& data = *row.fData; |
| 413 | int count = data.count(); |
| 414 | SkASSERT(!(count & 1)); |
| 415 | const uint8_t* ptr = data.begin(); |
| 416 | for (int x = 0; x < count; x += 2) { |
| 417 | SkDebugf(" [%3d:%02X]", ptr[0], ptr[1]); |
| 418 | ptr += 2; |
| 419 | } |
| 420 | SkDebugf("\n"); |
| 421 | } |
| 422 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 423 | #if 0 |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 424 | int prevY = -1; |
| 425 | for (y = 0; y < fRows.count(); ++y) { |
| 426 | const Row& row = fRows[y]; |
| 427 | const SkTDArray<uint8_t>& data = *row.fData; |
| 428 | int count = data.count(); |
| 429 | for (int n = prevY; n < row.fY; ++n) { |
| 430 | const uint8_t* ptr = data.begin(); |
| 431 | for (int x = 0; x < count; x += 2) { |
| 432 | for (int i = 0; i < ptr[0]; ++i) { |
| 433 | SkDebugf("%02X", ptr[1]); |
| 434 | } |
| 435 | ptr += 2; |
| 436 | } |
| 437 | SkDebugf("\n"); |
| 438 | } |
| 439 | prevY = row.fY; |
| 440 | } |
| 441 | #endif |
| 442 | } |
| 443 | |
| 444 | void validate() { |
| 445 | #ifdef SK_DEBUG |
| 446 | int prevY = -1; |
| 447 | for (int i = 0; i < fRows.count(); ++i) { |
| 448 | const Row& row = fRows[i]; |
| 449 | SkASSERT(prevY < row.fY); |
| 450 | SkASSERT(fWidth == row.fWidth); |
| 451 | int count = row.fData->count(); |
| 452 | const uint8_t* ptr = row.fData->begin(); |
| 453 | SkASSERT(!(count & 1)); |
| 454 | int w = 0; |
| 455 | for (int x = 0; x < count; x += 2) { |
| 456 | w += ptr[0]; |
| 457 | SkASSERT(w <= fWidth); |
| 458 | ptr += 2; |
| 459 | } |
| 460 | SkASSERT(w == fWidth); |
| 461 | prevY = row.fY; |
| 462 | } |
| 463 | #endif |
| 464 | } |
| 465 | |
| 466 | private: |
| 467 | Row* flushRow(bool readyForAnother) { |
| 468 | Row* next = NULL; |
| 469 | int count = fRows.count(); |
| 470 | if (count > 0) { |
| 471 | // flush current row if needed |
| 472 | Row* curr = &fRows[count - 1]; |
| 473 | if (curr->fWidth < fWidth) { |
| 474 | AppendRun(*curr->fData, 0, fWidth - curr->fWidth); |
| 475 | } |
| 476 | } |
| 477 | if (count > 1) { |
| 478 | // are our last two runs the same? |
| 479 | Row* prev = &fRows[count - 2]; |
| 480 | Row* curr = &fRows[count - 1]; |
| 481 | SkASSERT(prev->fWidth == fWidth); |
| 482 | SkASSERT(curr->fWidth == fWidth); |
| 483 | if (*prev->fData == *curr->fData) { |
| 484 | prev->fY = curr->fY; |
| 485 | if (readyForAnother) { |
| 486 | curr->fData->rewind(); |
| 487 | next = curr; |
| 488 | } else { |
| 489 | delete curr->fData; |
| 490 | fRows.removeShuffle(count - 1); |
| 491 | } |
| 492 | } else { |
| 493 | if (readyForAnother) { |
| 494 | next = fRows.append(); |
| 495 | next->fData = new SkTDArray<uint8_t>; |
| 496 | } |
| 497 | } |
| 498 | } else { |
| 499 | if (readyForAnother) { |
| 500 | next = fRows.append(); |
| 501 | next->fData = new SkTDArray<uint8_t>; |
| 502 | } |
| 503 | } |
| 504 | return next; |
| 505 | } |
| 506 | |
| 507 | static void AppendRun(SkTDArray<uint8_t>& data, U8CPU alpha, int count) { |
| 508 | do { |
| 509 | int n = count; |
| 510 | if (n > 255) { |
| 511 | n = 255; |
| 512 | } |
| 513 | uint8_t* ptr = data.append(2); |
| 514 | ptr[0] = n; |
| 515 | ptr[1] = alpha; |
| 516 | count -= n; |
| 517 | } while (count > 0); |
| 518 | } |
| 519 | }; |
| 520 | |
| 521 | class SkAAClip::BuilderBlitter : public SkBlitter { |
| 522 | public: |
| 523 | BuilderBlitter(Builder* builder) { |
| 524 | fBuilder = builder; |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 525 | fLeft = builder->getBounds().fLeft; |
| 526 | fRight = builder->getBounds().fRight; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE |
| 530 | { unexpected(); } |
| 531 | virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE |
| 532 | { unexpected(); } |
| 533 | virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE |
| 534 | { unexpected(); } |
| 535 | |
| 536 | virtual const SkBitmap* justAnOpaqueColor(uint32_t*) SK_OVERRIDE { |
reed@google.com | 3771a03 | 2011-10-11 17:18:04 +0000 | [diff] [blame] | 537 | return NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | virtual void blitH(int x, int y, int width) SK_OVERRIDE { |
| 541 | fBuilder->addRun(x, y, 0xFF, width); |
| 542 | } |
| 543 | |
| 544 | virtual void blitAntiH(int x, int y, const SkAlpha alpha[], |
| 545 | const int16_t runs[]) SK_OVERRIDE { |
| 546 | for (;;) { |
| 547 | int count = *runs; |
| 548 | if (count <= 0) { |
| 549 | return; |
| 550 | } |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 551 | |
| 552 | // The supersampler's buffer can be the width of the device, so |
| 553 | // we may have to trim the run to our bounds. If so, we assert that |
| 554 | // the extra spans are always alpha==0 |
| 555 | int localX = x; |
| 556 | int localCount = count; |
| 557 | if (x < fLeft) { |
| 558 | SkASSERT(0 == *alpha); |
| 559 | int gap = fLeft - x; |
| 560 | SkASSERT(gap <= count); |
| 561 | localX += gap; |
| 562 | localCount -= gap; |
| 563 | } |
| 564 | int right = x + count; |
| 565 | if (right > fRight) { |
| 566 | SkASSERT(0 == *alpha); |
| 567 | localCount -= right - fRight; |
| 568 | SkASSERT(localCount >= 0); |
| 569 | } |
| 570 | |
| 571 | if (localCount) { |
| 572 | fBuilder->addRun(localX, y, *alpha, localCount); |
| 573 | } |
| 574 | NEXT_RUN: |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 575 | runs += count; |
| 576 | alpha += count; |
| 577 | x += count; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | private: |
| 582 | Builder* fBuilder; |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 583 | int fLeft; // cache of builder's bounds' left edge |
| 584 | int fRight; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 585 | |
| 586 | void unexpected() { |
| 587 | SkDebugf("---- did not expect to get called here"); |
| 588 | sk_throw(); |
| 589 | } |
| 590 | }; |
| 591 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 592 | bool SkAAClip::setPath(const SkPath& path, const SkRegion* clip, bool doAA) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 593 | if (clip && clip->isEmpty()) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 594 | return this->setEmpty(); |
| 595 | } |
| 596 | |
| 597 | SkIRect ibounds; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 598 | path.getBounds().roundOut(&ibounds); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 599 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 600 | SkRegion tmpClip; |
| 601 | if (NULL == clip) { |
| 602 | tmpClip.setRect(ibounds); |
| 603 | clip = &tmpClip; |
| 604 | } |
| 605 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 606 | if (!path.isInverseFillType()) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 607 | if (ibounds.isEmpty() || !ibounds.intersect(clip->getBounds())) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 608 | return this->setEmpty(); |
| 609 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 610 | } |
| 611 | |
| 612 | Builder builder(ibounds); |
| 613 | BuilderBlitter blitter(&builder); |
| 614 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 615 | if (doAA) { |
| 616 | SkScan::AntiFillPath(path, *clip, &blitter, true); |
| 617 | } else { |
| 618 | SkScan::FillPath(path, *clip, &blitter); |
| 619 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 620 | |
| 621 | this->freeRuns(); |
| 622 | fBounds = ibounds; |
| 623 | fRunHead = builder.finish(); |
| 624 | |
reed@google.com | 3771a03 | 2011-10-11 17:18:04 +0000 | [diff] [blame] | 625 | //builder.dump(); |
| 626 | return !this->isEmpty(); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 627 | } |
| 628 | |
| 629 | /////////////////////////////////////////////////////////////////////////////// |
| 630 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 631 | typedef void (*RowProc)(SkAAClip::Builder&, int bottom, |
| 632 | const uint8_t* rowA, const SkIRect& rectA, |
| 633 | const uint8_t* rowB, const SkIRect& rectB); |
| 634 | |
| 635 | static void sectRowProc(SkAAClip::Builder& builder, int bottom, |
| 636 | const uint8_t* rowA, const SkIRect& rectA, |
| 637 | const uint8_t* rowB, const SkIRect& rectB) { |
| 638 | |
| 639 | } |
| 640 | |
| 641 | typedef U8CPU (*AlphaProc)(U8CPU alphaA, U8CPU alphaB); |
| 642 | |
| 643 | static U8CPU sectAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 644 | // Multiply |
| 645 | return SkMulDiv255Round(alphaA, alphaB); |
| 646 | } |
| 647 | |
| 648 | static U8CPU unionAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 649 | // SrcOver |
| 650 | return alphaA + alphaB - SkMulDiv255Round(alphaA, alphaB); |
| 651 | } |
| 652 | |
| 653 | static U8CPU diffAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 654 | // SrcOut |
| 655 | return SkMulDiv255Round(alphaA, 0xFF - alphaB); |
| 656 | } |
| 657 | |
| 658 | static U8CPU xorAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 659 | // XOR |
| 660 | return alphaA + alphaB - 2 * SkMulDiv255Round(alphaA, alphaB); |
| 661 | } |
| 662 | |
| 663 | static AlphaProc find_alpha_proc(SkRegion::Op op) { |
| 664 | switch (op) { |
| 665 | case SkRegion::kIntersect_Op: |
| 666 | return sectAlphaProc; |
| 667 | case SkRegion::kDifference_Op: |
| 668 | return diffAlphaProc; |
| 669 | case SkRegion::kUnion_Op: |
| 670 | return unionAlphaProc; |
| 671 | case SkRegion::kXOR_Op: |
| 672 | return xorAlphaProc; |
| 673 | default: |
| 674 | SkASSERT(!"unexpected region op"); |
| 675 | return sectAlphaProc; |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | static const uint8_t gEmptyRow[] = { |
| 680 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 681 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 682 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 683 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 684 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 685 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 686 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 687 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 688 | }; |
| 689 | |
| 690 | class RowIter { |
| 691 | public: |
| 692 | RowIter(const uint8_t* row, const SkIRect& bounds) { |
| 693 | fRow = row; |
| 694 | fLeft = bounds.fLeft; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 695 | fBoundsRight = bounds.fRight; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 696 | if (row) { |
| 697 | fRight = bounds.fLeft + row[0]; |
| 698 | SkASSERT(fRight <= fBoundsRight); |
| 699 | fAlpha = row[1]; |
| 700 | fDone = false; |
| 701 | } else { |
| 702 | fDone = true; |
| 703 | fRight = kMaxInt32; |
| 704 | fAlpha = 0; |
| 705 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | bool done() const { return fDone; } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 709 | int left() const { return fLeft; } |
| 710 | int right() const { return fRight; } |
| 711 | U8CPU alpha() const { return fAlpha; } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 712 | void next() { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 713 | if (!fDone) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 714 | fLeft = fRight; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 715 | if (fRight == fBoundsRight) { |
| 716 | fDone = true; |
| 717 | fRight = kMaxInt32; |
| 718 | fAlpha = 0; |
| 719 | } else { |
| 720 | fRow += 2; |
| 721 | fRight += fRow[0]; |
| 722 | fAlpha = fRow[1]; |
| 723 | SkASSERT(fRight <= fBoundsRight); |
| 724 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 725 | } |
| 726 | } |
| 727 | |
| 728 | private: |
| 729 | const uint8_t* fRow; |
| 730 | int fLeft; |
| 731 | int fRight; |
| 732 | int fBoundsRight; |
| 733 | bool fDone; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 734 | uint8_t fAlpha; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 735 | }; |
| 736 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 737 | static void adjust_row(RowIter& iter, int& leftA, int& riteA, int rite) { |
| 738 | if (rite == riteA) { |
| 739 | iter.next(); |
| 740 | leftA = iter.left(); |
| 741 | riteA = iter.right(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 745 | static bool intersect(int& min, int& max, int boundsMin, int boundsMax) { |
| 746 | SkASSERT(min < max); |
| 747 | SkASSERT(boundsMin < boundsMax); |
| 748 | if (min >= boundsMax || max <= boundsMin) { |
| 749 | return false; |
| 750 | } |
| 751 | if (min < boundsMin) { |
| 752 | min = boundsMin; |
| 753 | } |
| 754 | if (max > boundsMax) { |
| 755 | max = boundsMax; |
| 756 | } |
| 757 | return true; |
| 758 | } |
| 759 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 760 | static void operatorX(SkAAClip::Builder& builder, int lastY, |
| 761 | RowIter& iterA, RowIter& iterB, |
| 762 | AlphaProc proc, const SkIRect& bounds) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 763 | int leftA = iterA.left(); |
| 764 | int riteA = iterA.right(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 765 | int leftB = iterB.left(); |
| 766 | int riteB = iterB.right(); |
| 767 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 768 | int prevRite = bounds.fLeft; |
| 769 | |
| 770 | do { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 771 | U8CPU alphaA = 0; |
| 772 | U8CPU alphaB = 0; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 773 | int left, rite; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 774 | |
| 775 | if (leftA < leftB) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 776 | left = leftA; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 777 | alphaA = iterA.alpha(); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 778 | if (riteA <= leftB) { |
| 779 | rite = riteA; |
| 780 | } else { |
| 781 | rite = leftA = leftB; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 782 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 783 | } else if (leftB < leftA) { |
| 784 | left = leftB; |
| 785 | alphaB = iterB.alpha(); |
| 786 | if (riteB <= leftA) { |
| 787 | rite = riteB; |
| 788 | } else { |
| 789 | rite = leftB = leftA; |
| 790 | } |
| 791 | } else { |
| 792 | left = leftA; // or leftB, since leftA == leftB |
| 793 | rite = leftA = leftB = SkMin32(riteA, riteB); |
| 794 | alphaA = iterA.alpha(); |
| 795 | alphaB = iterB.alpha(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 796 | } |
| 797 | |
| 798 | if (left >= bounds.fRight) { |
| 799 | break; |
| 800 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 801 | if (rite > bounds.fRight) { |
| 802 | rite = bounds.fRight; |
| 803 | } |
| 804 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 805 | if (left >= bounds.fLeft) { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 806 | SkASSERT(rite > left); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 807 | builder.addRun(left, lastY, proc(alphaA, alphaB), rite - left); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 808 | prevRite = rite; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 809 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 810 | |
| 811 | adjust_row(iterA, leftA, riteA, rite); |
| 812 | adjust_row(iterB, leftB, riteB, rite); |
| 813 | } while (!iterA.done() || !iterB.done()); |
| 814 | |
| 815 | if (prevRite < bounds.fRight) { |
| 816 | builder.addRun(prevRite, lastY, 0, bounds.fRight - prevRite); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 817 | } |
| 818 | } |
| 819 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 820 | static void adjust_iter(SkAAClip::Iter& iter, int& topA, int& botA, int bot) { |
| 821 | if (bot == botA) { |
| 822 | iter.next(); |
| 823 | topA = botA; |
| 824 | SkASSERT(botA == iter.top()); |
| 825 | botA = iter.bottom(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 826 | } |
| 827 | } |
| 828 | |
| 829 | static void operateY(SkAAClip::Builder& builder, const SkAAClip& A, |
| 830 | const SkAAClip& B, SkRegion::Op op) { |
| 831 | AlphaProc proc = find_alpha_proc(op); |
| 832 | const SkIRect& bounds = builder.getBounds(); |
| 833 | |
| 834 | SkAAClip::Iter iterA(A); |
| 835 | SkAAClip::Iter iterB(B); |
| 836 | |
| 837 | SkASSERT(!iterA.done()); |
| 838 | int topA = iterA.top(); |
| 839 | int botA = iterA.bottom(); |
| 840 | SkASSERT(!iterB.done()); |
| 841 | int topB = iterB.top(); |
| 842 | int botB = iterB.bottom(); |
| 843 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 844 | do { |
| 845 | const uint8_t* rowA = NULL; |
| 846 | const uint8_t* rowB = NULL; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 847 | int top, bot; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 848 | |
| 849 | if (topA < topB) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 850 | top = topA; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 851 | rowA = iterA.data(); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 852 | if (botA <= topB) { |
| 853 | bot = botA; |
| 854 | } else { |
| 855 | bot = topA = topB; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 856 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 857 | |
| 858 | } else if (topB < topA) { |
| 859 | top = topB; |
| 860 | rowB = iterB.data(); |
| 861 | if (botB <= topA) { |
| 862 | bot = botB; |
| 863 | } else { |
| 864 | bot = topB = topA; |
| 865 | } |
| 866 | } else { |
| 867 | top = topA; // or topB, since topA == topB |
| 868 | bot = topA = topB = SkMin32(botA, botB); |
| 869 | rowA = iterA.data(); |
| 870 | rowB = iterB.data(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | if (top >= bounds.fBottom) { |
| 874 | break; |
| 875 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 876 | |
| 877 | if (bot > bounds.fBottom) { |
| 878 | bot = bounds.fBottom; |
| 879 | } |
| 880 | SkASSERT(top < bot); |
| 881 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 882 | if (!rowA && !rowB) { |
| 883 | builder.addRun(bounds.fLeft, bot - 1, 0, bounds.width()); |
| 884 | } else if (top >= bounds.fTop) { |
| 885 | SkASSERT(bot <= bounds.fBottom); |
| 886 | RowIter rowIterA(rowA, rowA ? A.getBounds() : bounds); |
| 887 | RowIter rowIterB(rowB, rowB ? B.getBounds() : bounds); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 888 | operatorX(builder, bot - 1, rowIterA, rowIterB, proc, bounds); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 889 | } |
| 890 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 891 | adjust_iter(iterA, topA, botA, bot); |
| 892 | adjust_iter(iterB, topB, botB, bot); |
| 893 | } while (!iterA.done() || !iterB.done()); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | bool SkAAClip::op(const SkAAClip& clipAOrig, const SkAAClip& clipBOrig, |
| 897 | SkRegion::Op op) { |
| 898 | if (SkRegion::kReplace_Op == op) { |
| 899 | return this->set(clipBOrig); |
| 900 | } |
| 901 | |
| 902 | const SkAAClip* clipA = &clipAOrig; |
| 903 | const SkAAClip* clipB = &clipBOrig; |
| 904 | |
| 905 | if (SkRegion::kReverseDifference_Op == op) { |
| 906 | SkTSwap(clipA, clipB); |
| 907 | op = SkRegion::kDifference_Op; |
| 908 | } |
| 909 | |
| 910 | bool a_empty = clipA->isEmpty(); |
| 911 | bool b_empty = clipB->isEmpty(); |
| 912 | |
| 913 | SkIRect bounds; |
| 914 | switch (op) { |
| 915 | case SkRegion::kDifference_Op: |
| 916 | if (a_empty) { |
| 917 | return this->setEmpty(); |
| 918 | } |
| 919 | if (b_empty || !SkIRect::Intersects(clipA->fBounds, clipB->fBounds)) { |
| 920 | return this->set(*clipA); |
| 921 | } |
| 922 | bounds = clipA->fBounds; |
| 923 | break; |
| 924 | |
| 925 | case SkRegion::kIntersect_Op: |
| 926 | if ((a_empty | b_empty) || !bounds.intersect(clipA->fBounds, |
| 927 | clipB->fBounds)) { |
| 928 | return this->setEmpty(); |
| 929 | } |
| 930 | break; |
| 931 | |
| 932 | case SkRegion::kUnion_Op: |
| 933 | case SkRegion::kXOR_Op: |
| 934 | if (a_empty) { |
| 935 | return this->set(*clipB); |
| 936 | } |
| 937 | if (b_empty) { |
| 938 | return this->set(*clipA); |
| 939 | } |
| 940 | bounds = clipA->fBounds; |
| 941 | bounds.join(clipB->fBounds); |
| 942 | break; |
| 943 | |
| 944 | default: |
| 945 | SkASSERT(!"unknown region op"); |
| 946 | return !this->isEmpty(); |
| 947 | } |
| 948 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 949 | SkASSERT(SkIRect::Intersects(bounds, clipB->fBounds)); |
| 950 | SkASSERT(SkIRect::Intersects(bounds, clipB->fBounds)); |
| 951 | |
| 952 | Builder builder(bounds); |
| 953 | operateY(builder, *clipA, *clipB, op); |
| 954 | // don't free us until now, since we might be clipA or clipB |
| 955 | this->freeRuns(); |
| 956 | fBounds = bounds; |
| 957 | fRunHead = builder.finish(); |
| 958 | |
| 959 | return !this->isEmpty(); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 960 | } |
| 961 | |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 962 | bool SkAAClip::op(const SkIRect& r, SkRegion::Op op) { |
| 963 | SkAAClip clip; |
| 964 | clip.setRect(r); |
| 965 | return this->op(*this, clip, op); |
| 966 | } |
| 967 | |
reed@google.com | 0017708 | 2011-10-12 14:34:30 +0000 | [diff] [blame] | 968 | bool SkAAClip::op(const SkRect& r, SkRegion::Op op, bool doAA) { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 969 | SkAAClip clip; |
reed@google.com | 0017708 | 2011-10-12 14:34:30 +0000 | [diff] [blame] | 970 | clip.setRect(r, doAA); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 971 | return this->op(*this, clip, op); |
| 972 | } |
| 973 | |
| 974 | bool SkAAClip::op(const SkAAClip& clip, SkRegion::Op op) { |
| 975 | return this->op(*this, clip, op); |
| 976 | } |
| 977 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 978 | /////////////////////////////////////////////////////////////////////////////// |
| 979 | /////////////////////////////////////////////////////////////////////////////// |
| 980 | |
| 981 | static void expandToRuns(const uint8_t* SK_RESTRICT data, int initialCount, int width, |
| 982 | int16_t* SK_RESTRICT runs, SkAlpha* SK_RESTRICT aa) { |
| 983 | // we don't read our initial n from data, since the caller may have had to |
| 984 | // clip it, hence the initialCount parameter. |
| 985 | int n = initialCount; |
| 986 | for (;;) { |
| 987 | if (n > width) { |
| 988 | n = width; |
| 989 | } |
| 990 | SkASSERT(n > 0); |
| 991 | runs[0] = n; |
| 992 | runs += n; |
| 993 | |
| 994 | aa[0] = data[1]; |
| 995 | aa += n; |
| 996 | |
| 997 | data += 2; |
| 998 | width -= n; |
| 999 | if (0 == width) { |
| 1000 | break; |
| 1001 | } |
| 1002 | // load the next count |
| 1003 | n = data[0]; |
| 1004 | } |
| 1005 | runs[0] = 0; // sentinel |
| 1006 | } |
| 1007 | |
| 1008 | SkAAClipBlitter::~SkAAClipBlitter() { |
| 1009 | sk_free(fRuns); |
| 1010 | } |
| 1011 | |
| 1012 | void SkAAClipBlitter::ensureRunsAndAA() { |
| 1013 | if (NULL == fRuns) { |
| 1014 | // add 1 so we can store the terminating run count of 0 |
| 1015 | int count = fAAClipBounds.width() + 1; |
| 1016 | fRuns = (int16_t*)sk_malloc_throw(count * sizeof(int16_t) + |
| 1017 | count * sizeof(SkAlpha)); |
| 1018 | fAA = (SkAlpha*)(fRuns + count); |
| 1019 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 1020 | SkDEBUGCODE(sk_memset16((uint16_t*)fRuns, 0xFFFF, fAAClipBounds.width() + 1);) |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1021 | } |
| 1022 | |
| 1023 | void SkAAClipBlitter::blitH(int x, int y, int width) { |
| 1024 | SkASSERT(width > 0); |
| 1025 | SkASSERT(fAAClipBounds.contains(x, y)); |
| 1026 | SkASSERT(fAAClipBounds.contains(x + width - 1, y)); |
| 1027 | |
| 1028 | int lastY; |
| 1029 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
| 1030 | int initialCount; |
| 1031 | row = fAAClip->findX(row, x, &initialCount); |
| 1032 | |
| 1033 | if (initialCount >= width) { |
| 1034 | SkAlpha alpha = row[1]; |
| 1035 | if (0 == alpha) { |
| 1036 | return; |
| 1037 | } |
| 1038 | if (0xFF == alpha) { |
| 1039 | fBlitter->blitH(x, y, width); |
| 1040 | return; |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | this->ensureRunsAndAA(); |
| 1045 | expandToRuns(row, initialCount, width, fRuns, fAA); |
| 1046 | |
| 1047 | fBlitter->blitAntiH(x, y, fAA, fRuns); |
| 1048 | } |
| 1049 | |
| 1050 | static void merge(const uint8_t* SK_RESTRICT row, int rowN, |
| 1051 | const SkAlpha* SK_RESTRICT srcAA, |
| 1052 | const int16_t* SK_RESTRICT srcRuns, |
| 1053 | SkAlpha* SK_RESTRICT dstAA, |
| 1054 | int16_t* SK_RESTRICT dstRuns, |
| 1055 | int width) { |
| 1056 | SkDEBUGCODE(int accumulated = 0;) |
| 1057 | int srcN = srcRuns[0]; |
| 1058 | for (;;) { |
| 1059 | if (0 == srcN) { |
| 1060 | break; |
| 1061 | } |
| 1062 | SkASSERT(rowN > 0); |
| 1063 | SkASSERT(srcN > 0); |
| 1064 | |
| 1065 | unsigned newAlpha = SkMulDiv255Round(srcAA[0], row[1]); |
| 1066 | int minN = SkMin32(srcN, rowN); |
| 1067 | dstRuns[0] = minN; |
| 1068 | dstRuns += minN; |
| 1069 | dstAA[0] = newAlpha; |
| 1070 | dstAA += minN; |
| 1071 | |
| 1072 | if (0 == (srcN -= minN)) { |
| 1073 | srcN = srcRuns[0]; // refresh |
| 1074 | srcRuns += srcN; |
| 1075 | srcAA += srcN; |
| 1076 | srcN = srcRuns[0]; // reload |
| 1077 | } |
| 1078 | if (0 == (rowN -= minN)) { |
| 1079 | row += 2; |
| 1080 | rowN = row[0]; // reload |
| 1081 | } |
| 1082 | |
| 1083 | SkDEBUGCODE(accumulated += minN;) |
| 1084 | SkASSERT(accumulated <= width); |
| 1085 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 1086 | dstRuns[0] = 0; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | void SkAAClipBlitter::blitAntiH(int x, int y, const SkAlpha aa[], |
| 1090 | const int16_t runs[]) { |
| 1091 | int lastY; |
| 1092 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
| 1093 | int initialCount; |
| 1094 | row = fAAClip->findX(row, x, &initialCount); |
| 1095 | |
| 1096 | this->ensureRunsAndAA(); |
| 1097 | |
| 1098 | merge(row, initialCount, aa, runs, fAA, fRuns, fAAClipBounds.width()); |
| 1099 | fBlitter->blitAntiH(x, y, fAA, fRuns); |
| 1100 | } |
| 1101 | |
| 1102 | void SkAAClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) { |
| 1103 | if (fAAClip->quickContains(x, y, x + 1, y + height)) { |
| 1104 | fBlitter->blitV(x, y, height, alpha); |
| 1105 | return; |
| 1106 | } |
| 1107 | |
| 1108 | int stopY = y + height; |
| 1109 | do { |
| 1110 | int lastY; |
| 1111 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
| 1112 | int initialCount; |
| 1113 | row = fAAClip->findX(row, x, &initialCount); |
| 1114 | SkAlpha newAlpha = SkMulDiv255Round(alpha, row[1]); |
| 1115 | if (newAlpha) { |
| 1116 | fBlitter->blitV(x, y, lastY - y + 1, newAlpha); |
| 1117 | } |
| 1118 | y = lastY + 1; |
| 1119 | } while (y < stopY); |
| 1120 | } |
| 1121 | |
| 1122 | void SkAAClipBlitter::blitRect(int x, int y, int width, int height) { |
| 1123 | if (fAAClip->quickContains(x, y, x + width, y + height)) { |
| 1124 | fBlitter->blitRect(x, y, width, height); |
| 1125 | return; |
| 1126 | } |
| 1127 | |
| 1128 | while (--height >= 0) { |
| 1129 | this->blitH(x, y, width); |
| 1130 | y += 1; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | void SkAAClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { |
| 1135 | fBlitter->blitMask(mask, clip); |
| 1136 | } |
| 1137 | |
| 1138 | const SkBitmap* SkAAClipBlitter::justAnOpaqueColor(uint32_t* value) { |
| 1139 | return NULL; |
| 1140 | } |
| 1141 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1142 | /////////////////////////////////////////////////////////////////////////////// |
| 1143 | |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 1144 | bool SkAAClip::translate(int dx, int dy, SkAAClip* dst) const { |
| 1145 | if (NULL == dst) { |
| 1146 | return !this->isEmpty(); |
| 1147 | } |
| 1148 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1149 | if (this->isEmpty()) { |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 1150 | return dst->setEmpty(); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1151 | } |
| 1152 | |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame^] | 1153 | if (this != dst) { |
| 1154 | sk_atomic_inc(&fRunHead->fRefCnt); |
| 1155 | dst->fRunHead = fRunHead; |
| 1156 | dst->fBounds = fBounds; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1157 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1158 | dst->fBounds.offset(dx, dy); |
| 1159 | return true; |
| 1160 | } |
| 1161 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1162 | static void expand_row_to_mask(uint8_t* SK_RESTRICT mask, |
| 1163 | const uint8_t* SK_RESTRICT row, |
| 1164 | int width) { |
| 1165 | while (width > 0) { |
| 1166 | int n = row[0]; |
| 1167 | SkASSERT(width >= n); |
| 1168 | memset(mask, row[1], n); |
| 1169 | mask += n; |
| 1170 | row += 2; |
| 1171 | width -= n; |
| 1172 | } |
| 1173 | } |
| 1174 | |
| 1175 | void SkAAClip::copyToMask(SkMask* mask) const { |
| 1176 | mask->fFormat = SkMask::kA8_Format; |
| 1177 | if (this->isEmpty()) { |
| 1178 | mask->fBounds.setEmpty(); |
| 1179 | mask->fImage = NULL; |
| 1180 | mask->fRowBytes = 0; |
| 1181 | return; |
| 1182 | } |
| 1183 | |
| 1184 | mask->fBounds = fBounds; |
| 1185 | mask->fRowBytes = fBounds.width(); |
| 1186 | size_t size = mask->computeImageSize(); |
| 1187 | mask->fImage = SkMask::AllocImage(size); |
| 1188 | |
| 1189 | Iter iter(*this); |
| 1190 | uint8_t* dst = mask->fImage; |
| 1191 | const int width = fBounds.width(); |
| 1192 | |
| 1193 | int y = fBounds.fTop; |
| 1194 | while (!iter.done()) { |
| 1195 | do { |
| 1196 | expand_row_to_mask(dst, iter.data(), width); |
| 1197 | dst += mask->fRowBytes; |
| 1198 | } while (++y < iter.bottom()); |
| 1199 | iter.next(); |
| 1200 | } |
| 1201 | } |
| 1202 | |