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" |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 11 | #include "SkColorPriv.h" |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 12 | #include "SkPath.h" |
| 13 | #include "SkScan.h" |
| 14 | #include "SkThread.h" |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame] | 15 | #include "SkUtils.h" |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 16 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 17 | class AutoAAClipValidate { |
| 18 | public: |
| 19 | AutoAAClipValidate(const SkAAClip& clip) : fClip(clip) { |
| 20 | fClip.validate(); |
| 21 | } |
| 22 | ~AutoAAClipValidate() { |
| 23 | fClip.validate(); |
| 24 | } |
| 25 | private: |
| 26 | const SkAAClip& fClip; |
| 27 | }; |
| 28 | |
| 29 | #ifdef SK_DEBUG |
| 30 | #define AUTO_AACLIP_VALIDATE(clip) AutoAAClipValidate acv(clip) |
| 31 | #else |
| 32 | #define AUTO_AACLIP_VALIDATE(clip) |
| 33 | #endif |
| 34 | |
| 35 | /////////////////////////////////////////////////////////////////////////////// |
| 36 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 37 | #define kMaxInt32 0x7FFFFFFF |
| 38 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 39 | static inline bool x_in_rect(int x, const SkIRect& rect) { |
| 40 | return (unsigned)(x - rect.fLeft) < (unsigned)rect.width(); |
| 41 | } |
| 42 | |
| 43 | static inline bool y_in_rect(int y, const SkIRect& rect) { |
| 44 | return (unsigned)(y - rect.fTop) < (unsigned)rect.height(); |
| 45 | } |
| 46 | |
| 47 | /* |
| 48 | * Data runs are packed [count, alpha] |
| 49 | */ |
| 50 | |
| 51 | struct SkAAClip::YOffset { |
| 52 | int32_t fY; |
| 53 | uint32_t fOffset; |
| 54 | }; |
| 55 | |
| 56 | struct SkAAClip::RunHead { |
| 57 | int32_t fRefCnt; |
| 58 | int32_t fRowCount; |
| 59 | int32_t fDataSize; |
| 60 | |
| 61 | YOffset* yoffsets() { |
| 62 | return (YOffset*)((char*)this + sizeof(RunHead)); |
| 63 | } |
| 64 | const YOffset* yoffsets() const { |
| 65 | return (const YOffset*)((const char*)this + sizeof(RunHead)); |
| 66 | } |
| 67 | uint8_t* data() { |
| 68 | return (uint8_t*)(this->yoffsets() + fRowCount); |
| 69 | } |
| 70 | const uint8_t* data() const { |
| 71 | return (const uint8_t*)(this->yoffsets() + fRowCount); |
| 72 | } |
| 73 | |
| 74 | static RunHead* Alloc(int rowCount, size_t dataSize) { |
| 75 | size_t size = sizeof(RunHead) + rowCount * sizeof(YOffset) + dataSize; |
| 76 | RunHead* head = (RunHead*)sk_malloc_throw(size); |
| 77 | head->fRefCnt = 1; |
| 78 | head->fRowCount = rowCount; |
| 79 | head->fDataSize = dataSize; |
| 80 | return head; |
| 81 | } |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 82 | |
| 83 | static int ComputeRowSizeForWidth(int width) { |
| 84 | // 2 bytes per segment, where each segment can store up to 255 for count |
| 85 | int segments = 0; |
| 86 | while (width > 0) { |
| 87 | segments += 1; |
| 88 | int n = SkMin32(width, 255); |
| 89 | width -= n; |
| 90 | } |
| 91 | return segments * 2; // each segment is row[0] + row[1] (n + alpha) |
| 92 | } |
| 93 | |
| 94 | static RunHead* AllocRect(const SkIRect& bounds) { |
| 95 | SkASSERT(!bounds.isEmpty()); |
| 96 | int width = bounds.width(); |
| 97 | size_t rowSize = ComputeRowSizeForWidth(width); |
| 98 | RunHead* head = RunHead::Alloc(1, rowSize); |
| 99 | YOffset* yoff = head->yoffsets(); |
| 100 | yoff->fY = bounds.height() - 1; |
| 101 | yoff->fOffset = 0; |
| 102 | uint8_t* row = head->data(); |
| 103 | while (width > 0) { |
| 104 | int n = SkMin32(width, 255); |
| 105 | row[0] = n; |
| 106 | row[1] = 0xFF; |
| 107 | width -= n; |
| 108 | row += 2; |
| 109 | } |
| 110 | return head; |
| 111 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 112 | }; |
| 113 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 114 | class SkAAClip::Iter { |
| 115 | public: |
| 116 | Iter(const SkAAClip&); |
| 117 | |
| 118 | bool done() const { return fDone; } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 119 | int top() const { return fTop; } |
| 120 | int bottom() const { return fBottom; } |
| 121 | const uint8_t* data() const { return fData; } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 122 | void next(); |
| 123 | |
| 124 | private: |
| 125 | const YOffset* fCurrYOff; |
| 126 | const YOffset* fStopYOff; |
| 127 | const uint8_t* fData; |
| 128 | |
| 129 | int fTop, fBottom; |
| 130 | bool fDone; |
| 131 | }; |
| 132 | |
| 133 | SkAAClip::Iter::Iter(const SkAAClip& clip) { |
| 134 | if (clip.isEmpty()) { |
| 135 | fDone = true; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 136 | fTop = fBottom = clip.fBounds.fBottom; |
| 137 | fData = NULL; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 138 | return; |
| 139 | } |
| 140 | |
| 141 | const RunHead* head = clip.fRunHead; |
| 142 | fCurrYOff = head->yoffsets(); |
| 143 | fStopYOff = fCurrYOff + head->fRowCount; |
| 144 | fData = head->data() + fCurrYOff->fOffset; |
| 145 | |
| 146 | // setup first value |
| 147 | fTop = clip.fBounds.fTop; |
| 148 | fBottom = clip.fBounds.fTop + fCurrYOff->fY + 1; |
| 149 | fDone = false; |
| 150 | } |
| 151 | |
| 152 | void SkAAClip::Iter::next() { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 153 | if (!fDone) { |
| 154 | const YOffset* prev = fCurrYOff; |
| 155 | const YOffset* curr = prev + 1; |
| 156 | SkASSERT(curr <= fStopYOff); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 157 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 158 | fTop = fBottom; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 159 | if (curr >= fStopYOff) { |
| 160 | fDone = true; |
| 161 | fBottom = kMaxInt32; |
| 162 | fData = NULL; |
| 163 | } else { |
| 164 | fBottom += curr->fY - prev->fY; |
| 165 | fData += curr->fOffset - prev->fOffset; |
| 166 | fCurrYOff = curr; |
| 167 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 168 | } |
| 169 | } |
| 170 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 171 | #ifdef SK_DEBUG |
| 172 | static size_t compute_row_length(const uint8_t row[], int width) { |
| 173 | const uint8_t* origRow = row; |
| 174 | while (width > 0) { |
| 175 | int n = row[0]; |
| 176 | SkASSERT(n <= width); |
| 177 | row += 2; |
| 178 | width -= n; |
| 179 | } |
| 180 | SkASSERT(0 == width); |
| 181 | return row - origRow; |
| 182 | } |
| 183 | |
| 184 | void SkAAClip::validate() const { |
| 185 | if (NULL == fRunHead) { |
| 186 | SkASSERT(fBounds.isEmpty()); |
| 187 | return; |
| 188 | } |
| 189 | |
| 190 | const RunHead* head = fRunHead; |
| 191 | SkASSERT(head->fRefCnt > 0); |
| 192 | SkASSERT(head->fRowCount > 0); |
| 193 | SkASSERT(head->fDataSize > 0); |
| 194 | |
| 195 | const YOffset* yoff = head->yoffsets(); |
| 196 | const YOffset* ystop = yoff + head->fRowCount; |
| 197 | const uint8_t* row = head->data(); |
| 198 | SkASSERT(0 == yoff->fOffset); |
| 199 | // y values must be monotonic |
| 200 | int y = -1; |
| 201 | int32_t offset = -1; |
| 202 | size_t computedOffset = 0; |
| 203 | while (yoff < ystop) { |
| 204 | SkASSERT(y < yoff->fY); |
| 205 | y = yoff->fY; |
| 206 | SkASSERT(offset < (int32_t)yoff->fOffset); |
| 207 | offset = yoff->fOffset; |
| 208 | SkASSERT(yoff->fOffset == computedOffset); |
| 209 | yoff += 1; |
| 210 | |
| 211 | size_t rowLength = compute_row_length(row, fBounds.width()); |
| 212 | row += rowLength; |
| 213 | computedOffset += rowLength; |
| 214 | } |
| 215 | SkASSERT(head->fDataSize == computedOffset); |
| 216 | // check the last entry; |
| 217 | --yoff; |
| 218 | SkASSERT(yoff->fY == fBounds.height() - 1); |
| 219 | |
| 220 | } |
| 221 | #endif |
| 222 | |
| 223 | /////////////////////////////////////////////////////////////////////////////// |
| 224 | |
| 225 | // can't validate before we're done, since trimming is part of the process of |
| 226 | // making us valid after the Builder. Since we build from top to bottom, its |
| 227 | // possible our fBounds.fBottom is bigger than our last scanline of data, so |
| 228 | // we trim fBounds.fBottom back up. |
| 229 | // |
| 230 | // TODO: look to trim our bounds on top, left, right. |
| 231 | // TODO: check for duplicates in X and Y to further compress our data |
| 232 | // |
| 233 | bool SkAAClip::trimBounds() { |
| 234 | if (this->isEmpty()) { |
| 235 | return false; |
| 236 | } |
| 237 | |
| 238 | const RunHead* head = fRunHead; |
| 239 | const YOffset* yoff = head->yoffsets(); |
| 240 | |
| 241 | SkASSERT(head->fRowCount > 0); |
| 242 | const YOffset& lastY = yoff[head->fRowCount - 1]; |
| 243 | SkASSERT(lastY.fY + 1 <= fBounds.height()); |
| 244 | fBounds.fBottom = fBounds.fTop + lastY.fY + 1; |
| 245 | SkASSERT(lastY.fY + 1 == fBounds.height()); |
| 246 | return true; |
| 247 | } |
| 248 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 249 | /////////////////////////////////////////////////////////////////////////////// |
| 250 | |
| 251 | void SkAAClip::freeRuns() { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 252 | if (fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 253 | SkASSERT(fRunHead->fRefCnt >= 1); |
| 254 | if (1 == sk_atomic_dec(&fRunHead->fRefCnt)) { |
| 255 | sk_free(fRunHead); |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | SkAAClip::SkAAClip() { |
| 261 | fBounds.setEmpty(); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 262 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | SkAAClip::SkAAClip(const SkAAClip& src) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 266 | SkDEBUGCODE(fBounds.setEmpty();) // need this for validate |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 267 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 268 | *this = src; |
| 269 | } |
| 270 | |
| 271 | SkAAClip::~SkAAClip() { |
| 272 | this->freeRuns(); |
| 273 | } |
| 274 | |
| 275 | SkAAClip& SkAAClip::operator=(const SkAAClip& src) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 276 | AUTO_AACLIP_VALIDATE(*this); |
| 277 | src.validate(); |
| 278 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 279 | if (this != &src) { |
| 280 | this->freeRuns(); |
| 281 | fBounds = src.fBounds; |
| 282 | fRunHead = src.fRunHead; |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 283 | if (fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 284 | sk_atomic_inc(&fRunHead->fRefCnt); |
| 285 | } |
| 286 | } |
| 287 | return *this; |
| 288 | } |
| 289 | |
| 290 | bool operator==(const SkAAClip& a, const SkAAClip& b) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 291 | a.validate(); |
| 292 | b.validate(); |
| 293 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 294 | if (&a == &b) { |
| 295 | return true; |
| 296 | } |
| 297 | if (a.fBounds != b.fBounds) { |
| 298 | return false; |
| 299 | } |
| 300 | |
| 301 | const SkAAClip::RunHead* ah = a.fRunHead; |
| 302 | const SkAAClip::RunHead* bh = b.fRunHead; |
| 303 | |
| 304 | // this catches empties and rects being equal |
| 305 | if (ah == bh) { |
| 306 | return true; |
| 307 | } |
| 308 | |
| 309 | // now we insist that both are complex (but different ptrs) |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 310 | if (!a.fRunHead || !b.fRunHead) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 311 | return false; |
| 312 | } |
| 313 | |
| 314 | return ah->fRowCount == bh->fRowCount && |
| 315 | ah->fDataSize == bh->fDataSize && |
| 316 | !memcmp(ah->data(), bh->data(), ah->fDataSize); |
| 317 | } |
| 318 | |
| 319 | void SkAAClip::swap(SkAAClip& other) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 320 | AUTO_AACLIP_VALIDATE(*this); |
| 321 | other.validate(); |
| 322 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 323 | SkTSwap(fBounds, other.fBounds); |
| 324 | SkTSwap(fRunHead, other.fRunHead); |
| 325 | } |
| 326 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 327 | bool SkAAClip::set(const SkAAClip& src) { |
| 328 | *this = src; |
| 329 | return !this->isEmpty(); |
| 330 | } |
| 331 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 332 | bool SkAAClip::setEmpty() { |
| 333 | this->freeRuns(); |
| 334 | fBounds.setEmpty(); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 335 | fRunHead = NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 336 | return false; |
| 337 | } |
| 338 | |
| 339 | bool SkAAClip::setRect(const SkIRect& bounds) { |
| 340 | if (bounds.isEmpty()) { |
| 341 | return this->setEmpty(); |
| 342 | } |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 343 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 344 | AUTO_AACLIP_VALIDATE(*this); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 345 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 346 | #if 0 |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 347 | SkRect r; |
| 348 | r.set(bounds); |
| 349 | SkPath path; |
| 350 | path.addRect(r); |
| 351 | return this->setPath(path); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 352 | #else |
| 353 | this->freeRuns(); |
| 354 | fBounds = bounds; |
| 355 | fRunHead = RunHead::AllocRect(bounds); |
| 356 | SkASSERT(!this->isEmpty()); |
| 357 | return true; |
| 358 | #endif |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 359 | } |
| 360 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 361 | bool SkAAClip::setRect(const SkRect& r, bool doAA) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 362 | if (r.isEmpty()) { |
| 363 | return this->setEmpty(); |
| 364 | } |
| 365 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 366 | AUTO_AACLIP_VALIDATE(*this); |
| 367 | |
| 368 | // TODO: special case this |
| 369 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 370 | SkPath path; |
| 371 | path.addRect(r); |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 372 | return this->setPath(path, NULL, doAA); |
| 373 | } |
| 374 | |
| 375 | bool SkAAClip::setRegion(const SkRegion& rgn) { |
| 376 | if (rgn.isEmpty()) { |
| 377 | return this->setEmpty(); |
| 378 | } |
| 379 | if (rgn.isRect()) { |
| 380 | return this->setRect(rgn.getBounds()); |
| 381 | } |
| 382 | |
| 383 | SkAAClip clip; |
| 384 | SkRegion::Iterator iter(rgn); |
| 385 | for (; !iter.done(); iter.next()) { |
| 386 | clip.op(iter.rect(), SkRegion::kUnion_Op); |
| 387 | } |
| 388 | this->swap(clip); |
reed@google.com | 3771a03 | 2011-10-11 17:18:04 +0000 | [diff] [blame] | 389 | return !this->isEmpty(); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | /////////////////////////////////////////////////////////////////////////////// |
| 393 | |
| 394 | const uint8_t* SkAAClip::findRow(int y, int* lastYForRow) const { |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 395 | SkASSERT(fRunHead); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 396 | |
| 397 | if (!y_in_rect(y, fBounds)) { |
| 398 | return NULL; |
| 399 | } |
| 400 | y -= fBounds.y(); // our yoffs values are relative to the top |
| 401 | |
| 402 | const YOffset* yoff = fRunHead->yoffsets(); |
| 403 | while (yoff->fY < y) { |
| 404 | yoff += 1; |
| 405 | SkASSERT(yoff - fRunHead->yoffsets() < fRunHead->fRowCount); |
| 406 | } |
| 407 | |
| 408 | if (lastYForRow) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 409 | *lastYForRow = fBounds.y() + yoff->fY; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 410 | } |
| 411 | return fRunHead->data() + yoff->fOffset; |
| 412 | } |
| 413 | |
| 414 | const uint8_t* SkAAClip::findX(const uint8_t data[], int x, int* initialCount) const { |
| 415 | SkASSERT(x_in_rect(x, fBounds)); |
| 416 | x -= fBounds.x(); |
| 417 | |
| 418 | // first skip up to X |
| 419 | for (;;) { |
| 420 | int n = data[0]; |
| 421 | if (x < n) { |
| 422 | *initialCount = n - x; |
| 423 | break; |
| 424 | } |
| 425 | data += 2; |
| 426 | x -= n; |
| 427 | } |
| 428 | return data; |
| 429 | } |
| 430 | |
| 431 | bool SkAAClip::quickContains(int left, int top, int right, int bottom) const { |
| 432 | if (this->isEmpty()) { |
| 433 | return false; |
| 434 | } |
| 435 | if (!fBounds.contains(left, top, right, bottom)) { |
| 436 | return false; |
| 437 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 438 | #if 0 |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 439 | if (this->isRect()) { |
| 440 | return true; |
| 441 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 442 | #endif |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 443 | |
| 444 | int lastY; |
| 445 | const uint8_t* row = this->findRow(top, &lastY); |
| 446 | if (lastY < bottom) { |
| 447 | return false; |
| 448 | } |
| 449 | // now just need to check in X |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 450 | int count; |
| 451 | row = this->findX(row, left, &count); |
| 452 | #if 0 |
| 453 | return count >= (right - left) && 0xFF == row[1]; |
| 454 | #else |
| 455 | int rectWidth = right - left; |
| 456 | while (0xFF == row[1]) { |
| 457 | if (count >= rectWidth) { |
| 458 | return true; |
| 459 | } |
| 460 | rectWidth -= count; |
| 461 | row += 2; |
| 462 | count = row[0]; |
| 463 | } |
| 464 | return false; |
| 465 | #endif |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /////////////////////////////////////////////////////////////////////////////// |
| 469 | |
| 470 | class SkAAClip::Builder { |
| 471 | SkIRect fBounds; |
| 472 | struct Row { |
| 473 | int fY; |
| 474 | int fWidth; |
| 475 | SkTDArray<uint8_t>* fData; |
| 476 | }; |
| 477 | SkTDArray<Row> fRows; |
| 478 | Row* fCurrRow; |
| 479 | int fPrevY; |
| 480 | int fWidth; |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 481 | int fMinY; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 482 | |
| 483 | public: |
| 484 | Builder(const SkIRect& bounds) : fBounds(bounds) { |
| 485 | fPrevY = -1; |
| 486 | fWidth = bounds.width(); |
| 487 | fCurrRow = NULL; |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 488 | fMinY = bounds.fTop; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | ~Builder() { |
| 492 | Row* row = fRows.begin(); |
| 493 | Row* stop = fRows.end(); |
| 494 | while (row < stop) { |
| 495 | delete row->fData; |
| 496 | row += 1; |
| 497 | } |
| 498 | } |
| 499 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 500 | const SkIRect& getBounds() const { return fBounds; } |
| 501 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 502 | void addRun(int x, int y, U8CPU alpha, int count) { |
| 503 | SkASSERT(count > 0); |
| 504 | SkASSERT(fBounds.contains(x, y)); |
| 505 | SkASSERT(fBounds.contains(x + count - 1, y)); |
| 506 | |
| 507 | x -= fBounds.left(); |
| 508 | y -= fBounds.top(); |
| 509 | |
| 510 | Row* row = fCurrRow; |
| 511 | if (y != fPrevY) { |
| 512 | SkASSERT(y > fPrevY); |
| 513 | fPrevY = y; |
| 514 | row = this->flushRow(true); |
| 515 | row->fY = y; |
| 516 | row->fWidth = 0; |
| 517 | SkASSERT(row->fData); |
| 518 | SkASSERT(0 == row->fData->count()); |
| 519 | fCurrRow = row; |
| 520 | } |
| 521 | |
| 522 | SkASSERT(row->fWidth <= x); |
| 523 | SkASSERT(row->fWidth < fBounds.width()); |
| 524 | |
| 525 | SkTDArray<uint8_t>& data = *row->fData; |
| 526 | |
| 527 | int gap = x - row->fWidth; |
| 528 | if (gap) { |
| 529 | AppendRun(data, 0, gap); |
| 530 | row->fWidth += gap; |
| 531 | SkASSERT(row->fWidth < fBounds.width()); |
| 532 | } |
| 533 | |
| 534 | AppendRun(data, alpha, count); |
| 535 | row->fWidth += count; |
| 536 | SkASSERT(row->fWidth <= fBounds.width()); |
| 537 | } |
| 538 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 539 | bool finish(SkAAClip* target) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 540 | this->flushRow(false); |
| 541 | |
| 542 | const Row* row = fRows.begin(); |
| 543 | const Row* stop = fRows.end(); |
| 544 | |
| 545 | size_t dataSize = 0; |
| 546 | while (row < stop) { |
| 547 | dataSize += row->fData->count(); |
| 548 | row += 1; |
| 549 | } |
| 550 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 551 | if (0 == dataSize) { |
| 552 | return target->setEmpty(); |
| 553 | } |
| 554 | |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 555 | SkASSERT(fMinY >= fBounds.fTop); |
| 556 | SkASSERT(fMinY < fBounds.fBottom); |
| 557 | int adjustY = fMinY - fBounds.fTop; |
| 558 | fBounds.fTop = fMinY; |
| 559 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 560 | RunHead* head = RunHead::Alloc(fRows.count(), dataSize); |
| 561 | YOffset* yoffset = head->yoffsets(); |
| 562 | uint8_t* data = head->data(); |
| 563 | uint8_t* baseData = data; |
| 564 | |
| 565 | row = fRows.begin(); |
| 566 | while (row < stop) { |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 567 | yoffset->fY = row->fY - adjustY; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 568 | yoffset->fOffset = data - baseData; |
| 569 | yoffset += 1; |
| 570 | |
| 571 | size_t n = row->fData->count(); |
| 572 | memcpy(data, row->fData->begin(), n); |
| 573 | data += n; |
| 574 | |
| 575 | row += 1; |
| 576 | } |
| 577 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 578 | target->freeRuns(); |
| 579 | target->fBounds = fBounds; |
| 580 | target->fRunHead = head; |
| 581 | return target->trimBounds(); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 582 | } |
| 583 | |
| 584 | void dump() { |
| 585 | this->validate(); |
| 586 | int y; |
| 587 | for (y = 0; y < fRows.count(); ++y) { |
| 588 | const Row& row = fRows[y]; |
| 589 | SkDebugf("Y:%3d W:%3d", row.fY, row.fWidth); |
| 590 | const SkTDArray<uint8_t>& data = *row.fData; |
| 591 | int count = data.count(); |
| 592 | SkASSERT(!(count & 1)); |
| 593 | const uint8_t* ptr = data.begin(); |
| 594 | for (int x = 0; x < count; x += 2) { |
| 595 | SkDebugf(" [%3d:%02X]", ptr[0], ptr[1]); |
| 596 | ptr += 2; |
| 597 | } |
| 598 | SkDebugf("\n"); |
| 599 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | void validate() { |
| 603 | #ifdef SK_DEBUG |
| 604 | int prevY = -1; |
| 605 | for (int i = 0; i < fRows.count(); ++i) { |
| 606 | const Row& row = fRows[i]; |
| 607 | SkASSERT(prevY < row.fY); |
| 608 | SkASSERT(fWidth == row.fWidth); |
| 609 | int count = row.fData->count(); |
| 610 | const uint8_t* ptr = row.fData->begin(); |
| 611 | SkASSERT(!(count & 1)); |
| 612 | int w = 0; |
| 613 | for (int x = 0; x < count; x += 2) { |
| 614 | w += ptr[0]; |
| 615 | SkASSERT(w <= fWidth); |
| 616 | ptr += 2; |
| 617 | } |
| 618 | SkASSERT(w == fWidth); |
| 619 | prevY = row.fY; |
| 620 | } |
| 621 | #endif |
| 622 | } |
| 623 | |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 624 | // only called by BuilderBlitter |
| 625 | void setMinY(int y) { |
| 626 | fMinY = y; |
| 627 | } |
| 628 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 629 | private: |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 630 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 631 | Row* flushRow(bool readyForAnother) { |
| 632 | Row* next = NULL; |
| 633 | int count = fRows.count(); |
| 634 | if (count > 0) { |
| 635 | // flush current row if needed |
| 636 | Row* curr = &fRows[count - 1]; |
| 637 | if (curr->fWidth < fWidth) { |
| 638 | AppendRun(*curr->fData, 0, fWidth - curr->fWidth); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 639 | curr->fWidth = fWidth; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 640 | } |
| 641 | } |
| 642 | if (count > 1) { |
| 643 | // are our last two runs the same? |
| 644 | Row* prev = &fRows[count - 2]; |
| 645 | Row* curr = &fRows[count - 1]; |
| 646 | SkASSERT(prev->fWidth == fWidth); |
| 647 | SkASSERT(curr->fWidth == fWidth); |
| 648 | if (*prev->fData == *curr->fData) { |
| 649 | prev->fY = curr->fY; |
| 650 | if (readyForAnother) { |
| 651 | curr->fData->rewind(); |
| 652 | next = curr; |
| 653 | } else { |
| 654 | delete curr->fData; |
| 655 | fRows.removeShuffle(count - 1); |
| 656 | } |
| 657 | } else { |
| 658 | if (readyForAnother) { |
| 659 | next = fRows.append(); |
| 660 | next->fData = new SkTDArray<uint8_t>; |
| 661 | } |
| 662 | } |
| 663 | } else { |
| 664 | if (readyForAnother) { |
| 665 | next = fRows.append(); |
| 666 | next->fData = new SkTDArray<uint8_t>; |
| 667 | } |
| 668 | } |
| 669 | return next; |
| 670 | } |
| 671 | |
| 672 | static void AppendRun(SkTDArray<uint8_t>& data, U8CPU alpha, int count) { |
| 673 | do { |
| 674 | int n = count; |
| 675 | if (n > 255) { |
| 676 | n = 255; |
| 677 | } |
| 678 | uint8_t* ptr = data.append(2); |
| 679 | ptr[0] = n; |
| 680 | ptr[1] = alpha; |
| 681 | count -= n; |
| 682 | } while (count > 0); |
| 683 | } |
| 684 | }; |
| 685 | |
| 686 | class SkAAClip::BuilderBlitter : public SkBlitter { |
| 687 | public: |
| 688 | BuilderBlitter(Builder* builder) { |
| 689 | fBuilder = builder; |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 690 | fLeft = builder->getBounds().fLeft; |
| 691 | fRight = builder->getBounds().fRight; |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 692 | fMinY = SK_MaxS32; |
| 693 | } |
| 694 | |
| 695 | void finish() { |
| 696 | if (fMinY < SK_MaxS32) { |
| 697 | fBuilder->setMinY(fMinY); |
| 698 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE |
| 702 | { unexpected(); } |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 703 | |
| 704 | // let the default impl call blitH |
| 705 | // virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE |
| 706 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 707 | virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE |
| 708 | { unexpected(); } |
| 709 | |
| 710 | virtual const SkBitmap* justAnOpaqueColor(uint32_t*) SK_OVERRIDE { |
reed@google.com | 3771a03 | 2011-10-11 17:18:04 +0000 | [diff] [blame] | 711 | return NULL; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | virtual void blitH(int x, int y, int width) SK_OVERRIDE { |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 715 | this->recordMinY(y); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 716 | fBuilder->addRun(x, y, 0xFF, width); |
| 717 | } |
| 718 | |
| 719 | virtual void blitAntiH(int x, int y, const SkAlpha alpha[], |
| 720 | const int16_t runs[]) SK_OVERRIDE { |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 721 | this->recordMinY(y); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 722 | for (;;) { |
| 723 | int count = *runs; |
| 724 | if (count <= 0) { |
| 725 | return; |
| 726 | } |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 727 | |
| 728 | // The supersampler's buffer can be the width of the device, so |
| 729 | // we may have to trim the run to our bounds. If so, we assert that |
| 730 | // the extra spans are always alpha==0 |
| 731 | int localX = x; |
| 732 | int localCount = count; |
| 733 | if (x < fLeft) { |
| 734 | SkASSERT(0 == *alpha); |
| 735 | int gap = fLeft - x; |
| 736 | SkASSERT(gap <= count); |
| 737 | localX += gap; |
| 738 | localCount -= gap; |
| 739 | } |
| 740 | int right = x + count; |
| 741 | if (right > fRight) { |
| 742 | SkASSERT(0 == *alpha); |
| 743 | localCount -= right - fRight; |
| 744 | SkASSERT(localCount >= 0); |
| 745 | } |
| 746 | |
| 747 | if (localCount) { |
| 748 | fBuilder->addRun(localX, y, *alpha, localCount); |
| 749 | } |
bsalomon@google.com | 820e80a | 2011-10-24 21:09:40 +0000 | [diff] [blame] | 750 | // Next run |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 751 | runs += count; |
| 752 | alpha += count; |
| 753 | x += count; |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | private: |
| 758 | Builder* fBuilder; |
reed@google.com | 1778564 | 2011-10-12 20:23:55 +0000 | [diff] [blame] | 759 | int fLeft; // cache of builder's bounds' left edge |
| 760 | int fRight; |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 761 | int fMinY; |
| 762 | |
| 763 | /* |
| 764 | * We track this, in case the scan converter skipped some number of |
| 765 | * scanlines at the (relative to the bounds it was given). This allows |
| 766 | * the builder, during its finish, to trip its bounds down to the "real" |
| 767 | * top. |
| 768 | */ |
| 769 | void recordMinY(int y) { |
| 770 | if (y < fMinY) { |
| 771 | fMinY = y; |
| 772 | } |
| 773 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 774 | |
| 775 | void unexpected() { |
| 776 | SkDebugf("---- did not expect to get called here"); |
| 777 | sk_throw(); |
| 778 | } |
| 779 | }; |
| 780 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 781 | bool SkAAClip::setPath(const SkPath& path, const SkRegion* clip, bool doAA) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 782 | AUTO_AACLIP_VALIDATE(*this); |
| 783 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 784 | if (clip && clip->isEmpty()) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 785 | return this->setEmpty(); |
| 786 | } |
| 787 | |
| 788 | SkIRect ibounds; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 789 | path.getBounds().roundOut(&ibounds); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 790 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 791 | SkRegion tmpClip; |
| 792 | if (NULL == clip) { |
| 793 | tmpClip.setRect(ibounds); |
| 794 | clip = &tmpClip; |
| 795 | } |
| 796 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 797 | if (path.isInverseFillType()) { |
| 798 | ibounds = clip->getBounds(); |
| 799 | } else { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 800 | if (ibounds.isEmpty() || !ibounds.intersect(clip->getBounds())) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 801 | return this->setEmpty(); |
| 802 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | Builder builder(ibounds); |
| 806 | BuilderBlitter blitter(&builder); |
| 807 | |
reed@google.com | f3c1da1 | 2011-10-10 19:35:47 +0000 | [diff] [blame] | 808 | if (doAA) { |
| 809 | SkScan::AntiFillPath(path, *clip, &blitter, true); |
| 810 | } else { |
| 811 | SkScan::FillPath(path, *clip, &blitter); |
| 812 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 813 | |
reed@google.com | 209c415 | 2011-10-26 15:03:48 +0000 | [diff] [blame^] | 814 | blitter.finish(); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 815 | return builder.finish(this); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 816 | } |
| 817 | |
| 818 | /////////////////////////////////////////////////////////////////////////////// |
| 819 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 820 | typedef void (*RowProc)(SkAAClip::Builder&, int bottom, |
| 821 | const uint8_t* rowA, const SkIRect& rectA, |
| 822 | const uint8_t* rowB, const SkIRect& rectB); |
| 823 | |
| 824 | static void sectRowProc(SkAAClip::Builder& builder, int bottom, |
| 825 | const uint8_t* rowA, const SkIRect& rectA, |
| 826 | const uint8_t* rowB, const SkIRect& rectB) { |
| 827 | |
| 828 | } |
| 829 | |
| 830 | typedef U8CPU (*AlphaProc)(U8CPU alphaA, U8CPU alphaB); |
| 831 | |
| 832 | static U8CPU sectAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 833 | // Multiply |
| 834 | return SkMulDiv255Round(alphaA, alphaB); |
| 835 | } |
| 836 | |
| 837 | static U8CPU unionAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 838 | // SrcOver |
| 839 | return alphaA + alphaB - SkMulDiv255Round(alphaA, alphaB); |
| 840 | } |
| 841 | |
| 842 | static U8CPU diffAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 843 | // SrcOut |
| 844 | return SkMulDiv255Round(alphaA, 0xFF - alphaB); |
| 845 | } |
| 846 | |
| 847 | static U8CPU xorAlphaProc(U8CPU alphaA, U8CPU alphaB) { |
| 848 | // XOR |
| 849 | return alphaA + alphaB - 2 * SkMulDiv255Round(alphaA, alphaB); |
| 850 | } |
| 851 | |
| 852 | static AlphaProc find_alpha_proc(SkRegion::Op op) { |
| 853 | switch (op) { |
| 854 | case SkRegion::kIntersect_Op: |
| 855 | return sectAlphaProc; |
| 856 | case SkRegion::kDifference_Op: |
| 857 | return diffAlphaProc; |
| 858 | case SkRegion::kUnion_Op: |
| 859 | return unionAlphaProc; |
| 860 | case SkRegion::kXOR_Op: |
| 861 | return xorAlphaProc; |
| 862 | default: |
| 863 | SkASSERT(!"unexpected region op"); |
| 864 | return sectAlphaProc; |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | static const uint8_t gEmptyRow[] = { |
| 869 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 870 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 871 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 872 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 873 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 874 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 875 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 876 | 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, 0xFF, 0, |
| 877 | }; |
| 878 | |
| 879 | class RowIter { |
| 880 | public: |
| 881 | RowIter(const uint8_t* row, const SkIRect& bounds) { |
| 882 | fRow = row; |
| 883 | fLeft = bounds.fLeft; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 884 | fBoundsRight = bounds.fRight; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 885 | if (row) { |
| 886 | fRight = bounds.fLeft + row[0]; |
| 887 | SkASSERT(fRight <= fBoundsRight); |
| 888 | fAlpha = row[1]; |
| 889 | fDone = false; |
| 890 | } else { |
| 891 | fDone = true; |
| 892 | fRight = kMaxInt32; |
| 893 | fAlpha = 0; |
| 894 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 895 | } |
| 896 | |
| 897 | bool done() const { return fDone; } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 898 | int left() const { return fLeft; } |
| 899 | int right() const { return fRight; } |
| 900 | U8CPU alpha() const { return fAlpha; } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 901 | void next() { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 902 | if (!fDone) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 903 | fLeft = fRight; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 904 | if (fRight == fBoundsRight) { |
| 905 | fDone = true; |
| 906 | fRight = kMaxInt32; |
| 907 | fAlpha = 0; |
| 908 | } else { |
| 909 | fRow += 2; |
| 910 | fRight += fRow[0]; |
| 911 | fAlpha = fRow[1]; |
| 912 | SkASSERT(fRight <= fBoundsRight); |
| 913 | } |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 914 | } |
| 915 | } |
| 916 | |
| 917 | private: |
| 918 | const uint8_t* fRow; |
| 919 | int fLeft; |
| 920 | int fRight; |
| 921 | int fBoundsRight; |
| 922 | bool fDone; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 923 | uint8_t fAlpha; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 924 | }; |
| 925 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 926 | static void adjust_row(RowIter& iter, int& leftA, int& riteA, int rite) { |
| 927 | if (rite == riteA) { |
| 928 | iter.next(); |
| 929 | leftA = iter.left(); |
| 930 | riteA = iter.right(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 931 | } |
| 932 | } |
| 933 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 934 | static bool intersect(int& min, int& max, int boundsMin, int boundsMax) { |
| 935 | SkASSERT(min < max); |
| 936 | SkASSERT(boundsMin < boundsMax); |
| 937 | if (min >= boundsMax || max <= boundsMin) { |
| 938 | return false; |
| 939 | } |
| 940 | if (min < boundsMin) { |
| 941 | min = boundsMin; |
| 942 | } |
| 943 | if (max > boundsMax) { |
| 944 | max = boundsMax; |
| 945 | } |
| 946 | return true; |
| 947 | } |
| 948 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 949 | static void operatorX(SkAAClip::Builder& builder, int lastY, |
| 950 | RowIter& iterA, RowIter& iterB, |
| 951 | AlphaProc proc, const SkIRect& bounds) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 952 | int leftA = iterA.left(); |
| 953 | int riteA = iterA.right(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 954 | int leftB = iterB.left(); |
| 955 | int riteB = iterB.right(); |
| 956 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 957 | int prevRite = bounds.fLeft; |
| 958 | |
| 959 | do { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 960 | U8CPU alphaA = 0; |
| 961 | U8CPU alphaB = 0; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 962 | int left, rite; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 963 | |
| 964 | if (leftA < leftB) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 965 | left = leftA; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 966 | alphaA = iterA.alpha(); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 967 | if (riteA <= leftB) { |
| 968 | rite = riteA; |
| 969 | } else { |
| 970 | rite = leftA = leftB; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 971 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 972 | } else if (leftB < leftA) { |
| 973 | left = leftB; |
| 974 | alphaB = iterB.alpha(); |
| 975 | if (riteB <= leftA) { |
| 976 | rite = riteB; |
| 977 | } else { |
| 978 | rite = leftB = leftA; |
| 979 | } |
| 980 | } else { |
| 981 | left = leftA; // or leftB, since leftA == leftB |
| 982 | rite = leftA = leftB = SkMin32(riteA, riteB); |
| 983 | alphaA = iterA.alpha(); |
| 984 | alphaB = iterB.alpha(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | if (left >= bounds.fRight) { |
| 988 | break; |
| 989 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame] | 990 | if (rite > bounds.fRight) { |
| 991 | rite = bounds.fRight; |
| 992 | } |
| 993 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 994 | if (left >= bounds.fLeft) { |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 995 | SkASSERT(rite > left); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 996 | builder.addRun(left, lastY, proc(alphaA, alphaB), rite - left); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 997 | prevRite = rite; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 998 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 999 | |
| 1000 | adjust_row(iterA, leftA, riteA, rite); |
| 1001 | adjust_row(iterB, leftB, riteB, rite); |
| 1002 | } while (!iterA.done() || !iterB.done()); |
| 1003 | |
| 1004 | if (prevRite < bounds.fRight) { |
| 1005 | builder.addRun(prevRite, lastY, 0, bounds.fRight - prevRite); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1006 | } |
| 1007 | } |
| 1008 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1009 | static void adjust_iter(SkAAClip::Iter& iter, int& topA, int& botA, int bot) { |
| 1010 | if (bot == botA) { |
| 1011 | iter.next(); |
| 1012 | topA = botA; |
| 1013 | SkASSERT(botA == iter.top()); |
| 1014 | botA = iter.bottom(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | static void operateY(SkAAClip::Builder& builder, const SkAAClip& A, |
| 1019 | const SkAAClip& B, SkRegion::Op op) { |
| 1020 | AlphaProc proc = find_alpha_proc(op); |
| 1021 | const SkIRect& bounds = builder.getBounds(); |
| 1022 | |
| 1023 | SkAAClip::Iter iterA(A); |
| 1024 | SkAAClip::Iter iterB(B); |
| 1025 | |
| 1026 | SkASSERT(!iterA.done()); |
| 1027 | int topA = iterA.top(); |
| 1028 | int botA = iterA.bottom(); |
| 1029 | SkASSERT(!iterB.done()); |
| 1030 | int topB = iterB.top(); |
| 1031 | int botB = iterB.bottom(); |
| 1032 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1033 | do { |
| 1034 | const uint8_t* rowA = NULL; |
| 1035 | const uint8_t* rowB = NULL; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1036 | int top, bot; |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1037 | |
| 1038 | if (topA < topB) { |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1039 | top = topA; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1040 | rowA = iterA.data(); |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1041 | if (botA <= topB) { |
| 1042 | bot = botA; |
| 1043 | } else { |
| 1044 | bot = topA = topB; |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1045 | } |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1046 | |
| 1047 | } else if (topB < topA) { |
| 1048 | top = topB; |
| 1049 | rowB = iterB.data(); |
| 1050 | if (botB <= topA) { |
| 1051 | bot = botB; |
| 1052 | } else { |
| 1053 | bot = topB = topA; |
| 1054 | } |
| 1055 | } else { |
| 1056 | top = topA; // or topB, since topA == topB |
| 1057 | bot = topA = topB = SkMin32(botA, botB); |
| 1058 | rowA = iterA.data(); |
| 1059 | rowB = iterB.data(); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | if (top >= bounds.fBottom) { |
| 1063 | break; |
| 1064 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame] | 1065 | |
| 1066 | if (bot > bounds.fBottom) { |
| 1067 | bot = bounds.fBottom; |
| 1068 | } |
| 1069 | SkASSERT(top < bot); |
| 1070 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1071 | if (!rowA && !rowB) { |
| 1072 | builder.addRun(bounds.fLeft, bot - 1, 0, bounds.width()); |
| 1073 | } else if (top >= bounds.fTop) { |
| 1074 | SkASSERT(bot <= bounds.fBottom); |
| 1075 | RowIter rowIterA(rowA, rowA ? A.getBounds() : bounds); |
| 1076 | RowIter rowIterB(rowB, rowB ? B.getBounds() : bounds); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1077 | operatorX(builder, bot - 1, rowIterA, rowIterB, proc, bounds); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1078 | } |
| 1079 | |
reed@google.com | 1c04bf9 | 2011-10-10 12:57:12 +0000 | [diff] [blame] | 1080 | adjust_iter(iterA, topA, botA, bot); |
| 1081 | adjust_iter(iterB, topB, botB, bot); |
| 1082 | } while (!iterA.done() || !iterB.done()); |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1083 | } |
| 1084 | |
| 1085 | bool SkAAClip::op(const SkAAClip& clipAOrig, const SkAAClip& clipBOrig, |
| 1086 | SkRegion::Op op) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1087 | AUTO_AACLIP_VALIDATE(*this); |
| 1088 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1089 | if (SkRegion::kReplace_Op == op) { |
| 1090 | return this->set(clipBOrig); |
| 1091 | } |
| 1092 | |
| 1093 | const SkAAClip* clipA = &clipAOrig; |
| 1094 | const SkAAClip* clipB = &clipBOrig; |
| 1095 | |
| 1096 | if (SkRegion::kReverseDifference_Op == op) { |
| 1097 | SkTSwap(clipA, clipB); |
| 1098 | op = SkRegion::kDifference_Op; |
| 1099 | } |
| 1100 | |
| 1101 | bool a_empty = clipA->isEmpty(); |
| 1102 | bool b_empty = clipB->isEmpty(); |
| 1103 | |
| 1104 | SkIRect bounds; |
| 1105 | switch (op) { |
| 1106 | case SkRegion::kDifference_Op: |
| 1107 | if (a_empty) { |
| 1108 | return this->setEmpty(); |
| 1109 | } |
| 1110 | if (b_empty || !SkIRect::Intersects(clipA->fBounds, clipB->fBounds)) { |
| 1111 | return this->set(*clipA); |
| 1112 | } |
| 1113 | bounds = clipA->fBounds; |
| 1114 | break; |
| 1115 | |
| 1116 | case SkRegion::kIntersect_Op: |
| 1117 | if ((a_empty | b_empty) || !bounds.intersect(clipA->fBounds, |
| 1118 | clipB->fBounds)) { |
| 1119 | return this->setEmpty(); |
| 1120 | } |
| 1121 | break; |
| 1122 | |
| 1123 | case SkRegion::kUnion_Op: |
| 1124 | case SkRegion::kXOR_Op: |
| 1125 | if (a_empty) { |
| 1126 | return this->set(*clipB); |
| 1127 | } |
| 1128 | if (b_empty) { |
| 1129 | return this->set(*clipA); |
| 1130 | } |
| 1131 | bounds = clipA->fBounds; |
| 1132 | bounds.join(clipB->fBounds); |
| 1133 | break; |
| 1134 | |
| 1135 | default: |
| 1136 | SkASSERT(!"unknown region op"); |
| 1137 | return !this->isEmpty(); |
| 1138 | } |
| 1139 | |
reed@google.com | 3228789 | 2011-10-05 16:27:44 +0000 | [diff] [blame] | 1140 | SkASSERT(SkIRect::Intersects(bounds, clipB->fBounds)); |
| 1141 | SkASSERT(SkIRect::Intersects(bounds, clipB->fBounds)); |
| 1142 | |
| 1143 | Builder builder(bounds); |
| 1144 | operateY(builder, *clipA, *clipB, op); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1145 | |
| 1146 | return builder.finish(this); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1147 | } |
| 1148 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1149 | /* |
| 1150 | * It can be expensive to build a local aaclip before applying the op, so |
| 1151 | * we first see if we can restrict the bounds of new rect to our current |
| 1152 | * bounds, or note that the new rect subsumes our current clip. |
| 1153 | */ |
| 1154 | |
| 1155 | bool SkAAClip::op(const SkIRect& rOrig, SkRegion::Op op) { |
| 1156 | SkIRect rStorage; |
| 1157 | const SkIRect* r = &rOrig; |
| 1158 | |
| 1159 | switch (op) { |
| 1160 | case SkRegion::kIntersect_Op: |
| 1161 | if (!rStorage.intersect(rOrig, fBounds)) { |
| 1162 | // no overlap, so we're empty |
| 1163 | return this->setEmpty(); |
| 1164 | } |
| 1165 | if (rStorage == fBounds) { |
| 1166 | // we were wholly inside the rect, no change |
| 1167 | return !this->isEmpty(); |
| 1168 | } |
| 1169 | if (this->quickContains(rStorage)) { |
| 1170 | // the intersection is wholly inside us, we're a rect |
| 1171 | return this->setRect(rStorage); |
| 1172 | } |
| 1173 | r = &rStorage; // use the intersected bounds |
| 1174 | break; |
| 1175 | case SkRegion::kDifference_Op: |
| 1176 | break; |
| 1177 | case SkRegion::kUnion_Op: |
| 1178 | if (rOrig.contains(fBounds)) { |
| 1179 | return this->setRect(rOrig); |
| 1180 | } |
| 1181 | break; |
| 1182 | default: |
| 1183 | break; |
| 1184 | } |
| 1185 | |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 1186 | SkAAClip clip; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1187 | clip.setRect(*r); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 1188 | return this->op(*this, clip, op); |
| 1189 | } |
| 1190 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1191 | bool SkAAClip::op(const SkRect& rOrig, SkRegion::Op op, bool doAA) { |
| 1192 | SkRect rStorage, boundsStorage; |
| 1193 | const SkRect* r = &rOrig; |
| 1194 | |
| 1195 | boundsStorage.set(fBounds); |
| 1196 | switch (op) { |
| 1197 | case SkRegion::kIntersect_Op: |
| 1198 | case SkRegion::kDifference_Op: |
| 1199 | if (!rStorage.intersect(rOrig, boundsStorage)) { |
| 1200 | return this->setEmpty(); |
| 1201 | } |
| 1202 | r = &rStorage; // use the intersected bounds |
| 1203 | break; |
| 1204 | case SkRegion::kUnion_Op: |
| 1205 | if (rOrig.contains(boundsStorage)) { |
| 1206 | return this->setRect(rOrig); |
| 1207 | } |
| 1208 | break; |
| 1209 | default: |
| 1210 | break; |
| 1211 | } |
| 1212 | |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 1213 | SkAAClip clip; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1214 | clip.setRect(*r, doAA); |
reed@google.com | 47ac84e | 2011-10-06 13:11:25 +0000 | [diff] [blame] | 1215 | return this->op(*this, clip, op); |
| 1216 | } |
| 1217 | |
| 1218 | bool SkAAClip::op(const SkAAClip& clip, SkRegion::Op op) { |
| 1219 | return this->op(*this, clip, op); |
| 1220 | } |
| 1221 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1222 | /////////////////////////////////////////////////////////////////////////////// |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1223 | |
| 1224 | bool SkAAClip::translate(int dx, int dy, SkAAClip* dst) const { |
| 1225 | if (NULL == dst) { |
| 1226 | return !this->isEmpty(); |
| 1227 | } |
| 1228 | |
| 1229 | if (this->isEmpty()) { |
| 1230 | return dst->setEmpty(); |
| 1231 | } |
| 1232 | |
| 1233 | if (this != dst) { |
| 1234 | sk_atomic_inc(&fRunHead->fRefCnt); |
| 1235 | dst->fRunHead = fRunHead; |
| 1236 | dst->fBounds = fBounds; |
| 1237 | } |
| 1238 | dst->fBounds.offset(dx, dy); |
| 1239 | return true; |
| 1240 | } |
| 1241 | |
| 1242 | static void expand_row_to_mask(uint8_t* SK_RESTRICT mask, |
| 1243 | const uint8_t* SK_RESTRICT row, |
| 1244 | int width) { |
| 1245 | while (width > 0) { |
| 1246 | int n = row[0]; |
| 1247 | SkASSERT(width >= n); |
| 1248 | memset(mask, row[1], n); |
| 1249 | mask += n; |
| 1250 | row += 2; |
| 1251 | width -= n; |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | void SkAAClip::copyToMask(SkMask* mask) const { |
| 1256 | mask->fFormat = SkMask::kA8_Format; |
| 1257 | if (this->isEmpty()) { |
| 1258 | mask->fBounds.setEmpty(); |
| 1259 | mask->fImage = NULL; |
| 1260 | mask->fRowBytes = 0; |
| 1261 | return; |
| 1262 | } |
| 1263 | |
| 1264 | mask->fBounds = fBounds; |
| 1265 | mask->fRowBytes = fBounds.width(); |
| 1266 | size_t size = mask->computeImageSize(); |
| 1267 | mask->fImage = SkMask::AllocImage(size); |
| 1268 | |
| 1269 | Iter iter(*this); |
| 1270 | uint8_t* dst = mask->fImage; |
| 1271 | const int width = fBounds.width(); |
| 1272 | |
| 1273 | int y = fBounds.fTop; |
| 1274 | while (!iter.done()) { |
| 1275 | do { |
| 1276 | expand_row_to_mask(dst, iter.data(), width); |
| 1277 | dst += mask->fRowBytes; |
| 1278 | } while (++y < iter.bottom()); |
| 1279 | iter.next(); |
| 1280 | } |
| 1281 | } |
| 1282 | |
| 1283 | /////////////////////////////////////////////////////////////////////////////// |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1284 | /////////////////////////////////////////////////////////////////////////////// |
| 1285 | |
| 1286 | static void expandToRuns(const uint8_t* SK_RESTRICT data, int initialCount, int width, |
| 1287 | int16_t* SK_RESTRICT runs, SkAlpha* SK_RESTRICT aa) { |
| 1288 | // we don't read our initial n from data, since the caller may have had to |
| 1289 | // clip it, hence the initialCount parameter. |
| 1290 | int n = initialCount; |
| 1291 | for (;;) { |
| 1292 | if (n > width) { |
| 1293 | n = width; |
| 1294 | } |
| 1295 | SkASSERT(n > 0); |
| 1296 | runs[0] = n; |
| 1297 | runs += n; |
| 1298 | |
| 1299 | aa[0] = data[1]; |
| 1300 | aa += n; |
| 1301 | |
| 1302 | data += 2; |
| 1303 | width -= n; |
| 1304 | if (0 == width) { |
| 1305 | break; |
| 1306 | } |
| 1307 | // load the next count |
| 1308 | n = data[0]; |
| 1309 | } |
| 1310 | runs[0] = 0; // sentinel |
| 1311 | } |
| 1312 | |
| 1313 | SkAAClipBlitter::~SkAAClipBlitter() { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1314 | sk_free(fScanlineScratch); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1315 | } |
| 1316 | |
| 1317 | void SkAAClipBlitter::ensureRunsAndAA() { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1318 | if (NULL == fScanlineScratch) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1319 | // add 1 so we can store the terminating run count of 0 |
| 1320 | int count = fAAClipBounds.width() + 1; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1321 | // we use this either for fRuns + fAA, or a scaline of a mask |
| 1322 | // which may be as deep as 32bits |
| 1323 | fScanlineScratch = sk_malloc_throw(count * sizeof(SkPMColor)); |
| 1324 | fRuns = (int16_t*)fScanlineScratch; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1325 | fAA = (SkAlpha*)(fRuns + count); |
| 1326 | } |
| 1327 | } |
| 1328 | |
| 1329 | void SkAAClipBlitter::blitH(int x, int y, int width) { |
| 1330 | SkASSERT(width > 0); |
| 1331 | SkASSERT(fAAClipBounds.contains(x, y)); |
| 1332 | SkASSERT(fAAClipBounds.contains(x + width - 1, y)); |
| 1333 | |
| 1334 | int lastY; |
| 1335 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
| 1336 | int initialCount; |
| 1337 | row = fAAClip->findX(row, x, &initialCount); |
| 1338 | |
| 1339 | if (initialCount >= width) { |
| 1340 | SkAlpha alpha = row[1]; |
| 1341 | if (0 == alpha) { |
| 1342 | return; |
| 1343 | } |
| 1344 | if (0xFF == alpha) { |
| 1345 | fBlitter->blitH(x, y, width); |
| 1346 | return; |
| 1347 | } |
| 1348 | } |
| 1349 | |
| 1350 | this->ensureRunsAndAA(); |
| 1351 | expandToRuns(row, initialCount, width, fRuns, fAA); |
| 1352 | |
| 1353 | fBlitter->blitAntiH(x, y, fAA, fRuns); |
| 1354 | } |
| 1355 | |
| 1356 | static void merge(const uint8_t* SK_RESTRICT row, int rowN, |
| 1357 | const SkAlpha* SK_RESTRICT srcAA, |
| 1358 | const int16_t* SK_RESTRICT srcRuns, |
| 1359 | SkAlpha* SK_RESTRICT dstAA, |
| 1360 | int16_t* SK_RESTRICT dstRuns, |
| 1361 | int width) { |
| 1362 | SkDEBUGCODE(int accumulated = 0;) |
| 1363 | int srcN = srcRuns[0]; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1364 | // do we need this check? |
| 1365 | if (0 == srcN) { |
| 1366 | return; |
| 1367 | } |
| 1368 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1369 | for (;;) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1370 | SkASSERT(rowN > 0); |
| 1371 | SkASSERT(srcN > 0); |
| 1372 | |
| 1373 | unsigned newAlpha = SkMulDiv255Round(srcAA[0], row[1]); |
| 1374 | int minN = SkMin32(srcN, rowN); |
| 1375 | dstRuns[0] = minN; |
| 1376 | dstRuns += minN; |
| 1377 | dstAA[0] = newAlpha; |
| 1378 | dstAA += minN; |
| 1379 | |
| 1380 | if (0 == (srcN -= minN)) { |
| 1381 | srcN = srcRuns[0]; // refresh |
| 1382 | srcRuns += srcN; |
| 1383 | srcAA += srcN; |
| 1384 | srcN = srcRuns[0]; // reload |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1385 | if (0 == srcN) { |
| 1386 | break; |
| 1387 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1388 | } |
| 1389 | if (0 == (rowN -= minN)) { |
| 1390 | row += 2; |
| 1391 | rowN = row[0]; // reload |
| 1392 | } |
| 1393 | |
| 1394 | SkDEBUGCODE(accumulated += minN;) |
| 1395 | SkASSERT(accumulated <= width); |
| 1396 | } |
reed@google.com | 34f7e47 | 2011-10-13 15:11:59 +0000 | [diff] [blame] | 1397 | dstRuns[0] = 0; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1398 | } |
| 1399 | |
| 1400 | void SkAAClipBlitter::blitAntiH(int x, int y, const SkAlpha aa[], |
| 1401 | const int16_t runs[]) { |
| 1402 | int lastY; |
| 1403 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
| 1404 | int initialCount; |
| 1405 | row = fAAClip->findX(row, x, &initialCount); |
| 1406 | |
| 1407 | this->ensureRunsAndAA(); |
| 1408 | |
| 1409 | merge(row, initialCount, aa, runs, fAA, fRuns, fAAClipBounds.width()); |
| 1410 | fBlitter->blitAntiH(x, y, fAA, fRuns); |
| 1411 | } |
| 1412 | |
| 1413 | void SkAAClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) { |
| 1414 | if (fAAClip->quickContains(x, y, x + 1, y + height)) { |
| 1415 | fBlitter->blitV(x, y, height, alpha); |
| 1416 | return; |
| 1417 | } |
| 1418 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1419 | for (;;) { |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1420 | int lastY; |
| 1421 | const uint8_t* row = fAAClip->findRow(y, &lastY); |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1422 | int dy = lastY - y + 1; |
| 1423 | if (dy > height) { |
| 1424 | dy = height; |
| 1425 | } |
| 1426 | height -= dy; |
| 1427 | |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1428 | int initialCount; |
| 1429 | row = fAAClip->findX(row, x, &initialCount); |
| 1430 | SkAlpha newAlpha = SkMulDiv255Round(alpha, row[1]); |
| 1431 | if (newAlpha) { |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1432 | fBlitter->blitV(x, y, dy, newAlpha); |
| 1433 | } |
| 1434 | SkASSERT(height >= 0); |
| 1435 | if (height <= 0) { |
| 1436 | break; |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1437 | } |
| 1438 | y = lastY + 1; |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1439 | } |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1440 | } |
| 1441 | |
| 1442 | void SkAAClipBlitter::blitRect(int x, int y, int width, int height) { |
| 1443 | if (fAAClip->quickContains(x, y, x + width, y + height)) { |
| 1444 | fBlitter->blitRect(x, y, width, height); |
| 1445 | return; |
| 1446 | } |
| 1447 | |
| 1448 | while (--height >= 0) { |
| 1449 | this->blitH(x, y, width); |
| 1450 | y += 1; |
| 1451 | } |
| 1452 | } |
| 1453 | |
reed@google.com | 045e62d | 2011-10-24 12:19:46 +0000 | [diff] [blame] | 1454 | typedef void (*MergeAAProc)(const void* src, int width, const uint8_t* row, |
| 1455 | int initialRowCount, void* dst); |
| 1456 | |
| 1457 | static void small_memcpy(void* dst, const void* src, size_t n) { |
| 1458 | memcpy(dst, src, n); |
| 1459 | } |
| 1460 | |
| 1461 | static void small_bzero(void* dst, size_t n) { |
| 1462 | sk_bzero(dst, n); |
| 1463 | } |
| 1464 | |
| 1465 | static inline uint8_t mergeOne(uint8_t value, unsigned alpha) { |
| 1466 | return SkMulDiv255Round(value, alpha); |
| 1467 | } |
| 1468 | static inline uint16_t mergeOne(uint16_t value, unsigned alpha) { |
| 1469 | unsigned r = SkGetPackedR16(value); |
| 1470 | unsigned g = SkGetPackedG16(value); |
| 1471 | unsigned b = SkGetPackedB16(value); |
| 1472 | return SkPackRGB16(SkMulDiv255Round(r, alpha), |
| 1473 | SkMulDiv255Round(r, alpha), |
| 1474 | SkMulDiv255Round(r, alpha)); |
| 1475 | } |
| 1476 | static inline SkPMColor mergeOne(SkPMColor value, unsigned alpha) { |
| 1477 | unsigned a = SkGetPackedA32(value); |
| 1478 | unsigned r = SkGetPackedR32(value); |
| 1479 | unsigned g = SkGetPackedG32(value); |
| 1480 | unsigned b = SkGetPackedB32(value); |
| 1481 | return SkPackARGB32(SkMulDiv255Round(a, alpha), |
| 1482 | SkMulDiv255Round(r, alpha), |
| 1483 | SkMulDiv255Round(g, alpha), |
| 1484 | SkMulDiv255Round(b, alpha)); |
| 1485 | } |
| 1486 | |
| 1487 | template <typename T> void mergeT(const T* SK_RESTRICT src, int srcN, |
| 1488 | const uint8_t* SK_RESTRICT row, int rowN, |
| 1489 | T* SK_RESTRICT dst) { |
| 1490 | SkDEBUGCODE(int accumulated = 0;) |
| 1491 | for (;;) { |
| 1492 | SkASSERT(rowN > 0); |
| 1493 | SkASSERT(srcN > 0); |
| 1494 | |
| 1495 | int n = SkMin32(rowN, srcN); |
| 1496 | unsigned rowA = row[1]; |
| 1497 | if (0xFF == rowA) { |
| 1498 | small_memcpy(dst, src, n * sizeof(T)); |
| 1499 | } else if (0 == rowA) { |
| 1500 | small_bzero(dst, n * sizeof(T)); |
| 1501 | } else { |
| 1502 | for (int i = 0; i < n; ++i) { |
| 1503 | dst[i] = mergeOne(src[i], rowA); |
| 1504 | } |
| 1505 | } |
| 1506 | |
| 1507 | if (0 == (srcN -= n)) { |
| 1508 | break; |
| 1509 | } |
| 1510 | |
| 1511 | src += n; |
| 1512 | dst += n; |
| 1513 | |
| 1514 | SkASSERT(rowN == n); |
| 1515 | row += 2; |
| 1516 | rowN = row[0]; |
| 1517 | } |
| 1518 | } |
| 1519 | |
| 1520 | static MergeAAProc find_merge_aa_proc(SkMask::Format format) { |
| 1521 | switch (format) { |
| 1522 | case SkMask::kBW_Format: |
| 1523 | SkASSERT(!"unsupported"); |
| 1524 | return NULL; |
| 1525 | case SkMask::kA8_Format: |
| 1526 | case SkMask::k3D_Format: { |
| 1527 | void (*proc8)(const uint8_t*, int, const uint8_t*, int, uint8_t*) = mergeT; |
| 1528 | return (MergeAAProc)proc8; |
| 1529 | } |
| 1530 | case SkMask::kLCD16_Format: { |
| 1531 | void (*proc16)(const uint16_t*, int, const uint8_t*, int, uint16_t*) = mergeT; |
| 1532 | return (MergeAAProc)proc16; |
| 1533 | } |
| 1534 | case SkMask::kLCD32_Format: { |
| 1535 | void (*proc32)(const SkPMColor*, int, const uint8_t*, int, SkPMColor*) = mergeT; |
| 1536 | return (MergeAAProc)proc32; |
| 1537 | } |
| 1538 | default: |
| 1539 | SkASSERT(!"unsupported"); |
| 1540 | return NULL; |
| 1541 | } |
| 1542 | } |
| 1543 | |
| 1544 | static U8CPU bit2byte(int bitInAByte) { |
| 1545 | SkASSERT(bitInAByte <= 0xFF); |
| 1546 | // negation turns any non-zero into 0xFFFFFF??, so we just shift down |
| 1547 | // some value >= 8 to get a full FF value |
| 1548 | return -bitInAByte >> 8; |
| 1549 | } |
| 1550 | |
| 1551 | static void upscaleBW2A8(SkMask* dstMask, const SkMask& srcMask) { |
| 1552 | SkASSERT(SkMask::kBW_Format == srcMask.fFormat); |
| 1553 | SkASSERT(SkMask::kA8_Format == dstMask->fFormat); |
| 1554 | |
| 1555 | const int width = srcMask.fBounds.width(); |
| 1556 | const int height = srcMask.fBounds.height(); |
| 1557 | |
| 1558 | const uint8_t* SK_RESTRICT src = (const uint8_t*)srcMask.fImage; |
| 1559 | const size_t srcRB = srcMask.fRowBytes; |
| 1560 | uint8_t* SK_RESTRICT dst = (uint8_t*)dstMask->fImage; |
| 1561 | const size_t dstRB = dstMask->fRowBytes; |
| 1562 | |
| 1563 | const int wholeBytes = width >> 3; |
| 1564 | const int leftOverBits = width & 7; |
| 1565 | |
| 1566 | for (int y = 0; y < height; ++y) { |
| 1567 | uint8_t* SK_RESTRICT d = dst; |
| 1568 | for (int i = 0; i < wholeBytes; ++i) { |
| 1569 | int srcByte = src[i]; |
| 1570 | d[0] = bit2byte(srcByte & (1 << 7)); |
| 1571 | d[1] = bit2byte(srcByte & (1 << 6)); |
| 1572 | d[2] = bit2byte(srcByte & (1 << 5)); |
| 1573 | d[3] = bit2byte(srcByte & (1 << 4)); |
| 1574 | d[4] = bit2byte(srcByte & (1 << 3)); |
| 1575 | d[5] = bit2byte(srcByte & (1 << 2)); |
| 1576 | d[6] = bit2byte(srcByte & (1 << 1)); |
| 1577 | d[7] = bit2byte(srcByte & (1 << 0)); |
| 1578 | d += 8; |
| 1579 | } |
| 1580 | if (leftOverBits) { |
| 1581 | int srcByte = src[wholeBytes]; |
| 1582 | for (int x = 0; x < leftOverBits; ++x) { |
| 1583 | *d++ = bit2byte(srcByte & 0x80); |
| 1584 | srcByte <<= 1; |
| 1585 | } |
| 1586 | } |
| 1587 | src += srcRB; |
| 1588 | dst += dstRB; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | void SkAAClipBlitter::blitMask(const SkMask& origMask, const SkIRect& clip) { |
| 1593 | SkASSERT(fAAClip->getBounds().contains(clip)); |
| 1594 | |
| 1595 | if (fAAClip->quickContains(clip)) { |
| 1596 | fBlitter->blitMask(origMask, clip); |
| 1597 | return; |
| 1598 | } |
| 1599 | |
| 1600 | const SkMask* mask = &origMask; |
| 1601 | |
| 1602 | // if we're BW, we need to upscale to A8 (ugh) |
| 1603 | SkMask grayMask; |
| 1604 | grayMask.fImage = NULL; |
| 1605 | if (SkMask::kBW_Format == origMask.fFormat) { |
| 1606 | grayMask.fFormat = SkMask::kA8_Format; |
| 1607 | grayMask.fBounds = origMask.fBounds; |
| 1608 | grayMask.fRowBytes = origMask.fBounds.width(); |
| 1609 | size_t size = grayMask.computeImageSize(); |
| 1610 | grayMask.fImage = (uint8_t*)fGrayMaskScratch.reset(size, |
| 1611 | SkAutoMalloc::kReuse_OnShrink); |
| 1612 | |
| 1613 | upscaleBW2A8(&grayMask, origMask); |
| 1614 | mask = &grayMask; |
| 1615 | } |
| 1616 | |
| 1617 | this->ensureRunsAndAA(); |
| 1618 | |
| 1619 | // HACK -- we are devolving 3D into A8, need to copy the rest of the 3D |
| 1620 | // data into a temp block to support it better (ugh) |
| 1621 | |
| 1622 | const void* src = mask->getAddr(clip.fLeft, clip.fTop); |
| 1623 | const size_t srcRB = mask->fRowBytes; |
| 1624 | const int width = clip.width(); |
| 1625 | MergeAAProc mergeProc = find_merge_aa_proc(mask->fFormat); |
| 1626 | |
| 1627 | SkMask rowMask; |
| 1628 | rowMask.fFormat = SkMask::k3D_Format == mask->fFormat ? SkMask::kA8_Format : mask->fFormat; |
| 1629 | rowMask.fBounds.fLeft = clip.fLeft; |
| 1630 | rowMask.fBounds.fRight = clip.fRight; |
| 1631 | rowMask.fRowBytes = mask->fRowBytes; // doesn't matter, since our height==1 |
| 1632 | rowMask.fImage = (uint8_t*)fScanlineScratch; |
| 1633 | |
| 1634 | int y = clip.fTop; |
| 1635 | const int stopY = y + clip.height(); |
| 1636 | |
| 1637 | do { |
| 1638 | int localStopY; |
| 1639 | const uint8_t* row = fAAClip->findRow(y, &localStopY); |
| 1640 | // findRow returns last Y, not stop, so we add 1 |
| 1641 | localStopY = SkMin32(localStopY + 1, stopY); |
| 1642 | |
| 1643 | int initialCount; |
| 1644 | row = fAAClip->findX(row, clip.fLeft, &initialCount); |
| 1645 | do { |
| 1646 | mergeProc(src, width, row, initialCount, rowMask.fImage); |
| 1647 | rowMask.fBounds.fTop = y; |
| 1648 | rowMask.fBounds.fBottom = y + 1; |
| 1649 | fBlitter->blitMask(rowMask, rowMask.fBounds); |
| 1650 | src = (const void*)((const char*)src + srcRB); |
| 1651 | } while (++y < localStopY); |
| 1652 | } while (y < stopY); |
reed@google.com | e36707a | 2011-10-04 21:38:55 +0000 | [diff] [blame] | 1653 | } |
| 1654 | |
| 1655 | const SkBitmap* SkAAClipBlitter::justAnOpaqueColor(uint32_t* value) { |
| 1656 | return NULL; |
| 1657 | } |
| 1658 | |