reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/sgl/SkPaint.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkPaint.h" |
| 19 | #include "SkColorFilter.h" |
| 20 | #include "SkDrawLooper.h" |
| 21 | #include "SkFontHost.h" |
| 22 | #include "SkMaskFilter.h" |
| 23 | #include "SkPathEffect.h" |
| 24 | #include "SkRasterizer.h" |
| 25 | #include "SkShader.h" |
| 26 | #include "SkScalerContext.h" |
| 27 | #include "SkStroke.h" |
| 28 | #include "SkTypeface.h" |
| 29 | #include "SkXfermode.h" |
| 30 | #include "SkAutoKern.h" |
| 31 | |
| 32 | #define SK_DefaultTextSize SkIntToScalar(12) |
| 33 | |
| 34 | #define SK_DefaultFlags 0 //(kNativeHintsText_Flag) |
| 35 | |
| 36 | SkPaint::SkPaint() |
| 37 | { |
| 38 | fTypeface = NULL; |
| 39 | fTextSize = SK_DefaultTextSize; |
| 40 | fTextScaleX = SK_Scalar1; |
| 41 | fTextSkewX = 0; |
| 42 | |
| 43 | fPathEffect = NULL; |
| 44 | fShader = NULL; |
| 45 | fXfermode = NULL; |
| 46 | fMaskFilter = NULL; |
| 47 | fColorFilter = NULL; |
| 48 | fRasterizer = NULL; |
| 49 | fLooper = NULL; |
| 50 | |
| 51 | fColor = SK_ColorBLACK; |
| 52 | fWidth = 0; |
| 53 | fMiterLimit = SK_DefaultMiterLimit; |
| 54 | fFlags = SK_DefaultFlags; |
| 55 | fCapType = kDefault_Cap; |
| 56 | fJoinType = kDefault_Join; |
| 57 | fTextAlign = kLeft_Align; |
| 58 | fStyle = kFill_Style; |
| 59 | fTextEncoding = kUTF8_TextEncoding; |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame^] | 60 | fHinting = kNormal_Hinting; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | SkPaint::SkPaint(const SkPaint& src) |
| 64 | { |
| 65 | memcpy(this, &src, sizeof(src)); |
| 66 | |
| 67 | fTypeface->safeRef(); |
| 68 | fPathEffect->safeRef(); |
| 69 | fShader->safeRef(); |
| 70 | fXfermode->safeRef(); |
| 71 | fMaskFilter->safeRef(); |
| 72 | fColorFilter->safeRef(); |
| 73 | fRasterizer->safeRef(); |
| 74 | fLooper->safeRef(); |
| 75 | } |
| 76 | |
| 77 | SkPaint::~SkPaint() |
| 78 | { |
| 79 | fTypeface->safeUnref(); |
| 80 | fPathEffect->safeUnref(); |
| 81 | fShader->safeUnref(); |
| 82 | fXfermode->safeUnref(); |
| 83 | fMaskFilter->safeUnref(); |
| 84 | fColorFilter->safeUnref(); |
| 85 | fRasterizer->safeUnref(); |
| 86 | fLooper->safeUnref(); |
| 87 | } |
| 88 | |
| 89 | SkPaint& SkPaint::operator=(const SkPaint& src) |
| 90 | { |
| 91 | SkASSERT(&src); |
| 92 | |
| 93 | src.fTypeface->safeRef(); |
| 94 | src.fPathEffect->safeRef(); |
| 95 | src.fShader->safeRef(); |
| 96 | src.fXfermode->safeRef(); |
| 97 | src.fMaskFilter->safeRef(); |
| 98 | src.fColorFilter->safeRef(); |
| 99 | src.fRasterizer->safeRef(); |
| 100 | src.fLooper->safeRef(); |
| 101 | |
| 102 | fTypeface->safeUnref(); |
| 103 | fPathEffect->safeUnref(); |
| 104 | fShader->safeUnref(); |
| 105 | fXfermode->safeUnref(); |
| 106 | fMaskFilter->safeUnref(); |
| 107 | fColorFilter->safeUnref(); |
| 108 | fRasterizer->safeUnref(); |
| 109 | fLooper->safeUnref(); |
| 110 | |
| 111 | memcpy(this, &src, sizeof(src)); |
| 112 | |
| 113 | return *this; |
| 114 | } |
| 115 | |
| 116 | int operator==(const SkPaint& a, const SkPaint& b) |
| 117 | { |
| 118 | return memcmp(&a, &b, sizeof(a)) == 0; |
| 119 | } |
| 120 | |
| 121 | void SkPaint::reset() |
| 122 | { |
| 123 | SkPaint init; |
| 124 | |
| 125 | *this = init; |
| 126 | } |
| 127 | |
| 128 | void SkPaint::setFlags(uint32_t flags) |
| 129 | { |
| 130 | fFlags = flags; |
| 131 | } |
| 132 | |
| 133 | void SkPaint::setAntiAlias(bool doAA) |
| 134 | { |
| 135 | this->setFlags(SkSetClearMask(fFlags, doAA, kAntiAlias_Flag)); |
| 136 | } |
| 137 | |
| 138 | void SkPaint::setDither(bool doDither) |
| 139 | { |
| 140 | this->setFlags(SkSetClearMask(fFlags, doDither, kDither_Flag)); |
| 141 | } |
| 142 | |
| 143 | void SkPaint::setSubpixelText(bool doSubpixel) |
| 144 | { |
| 145 | this->setFlags(SkSetClearMask(fFlags, doSubpixel, kSubpixelText_Flag)); |
| 146 | } |
| 147 | |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame^] | 148 | void SkPaint::setLCDRenderText(bool doLCDRender) |
| 149 | { |
| 150 | this->setFlags(SkSetClearMask(fFlags, doLCDRender, kLCDRenderText_Flag)); |
| 151 | } |
| 152 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 153 | void SkPaint::setLinearText(bool doLinearText) |
| 154 | { |
| 155 | this->setFlags(SkSetClearMask(fFlags, doLinearText, kLinearText_Flag)); |
| 156 | } |
| 157 | |
| 158 | void SkPaint::setUnderlineText(bool doUnderline) |
| 159 | { |
| 160 | this->setFlags(SkSetClearMask(fFlags, doUnderline, kUnderlineText_Flag)); |
| 161 | } |
| 162 | |
| 163 | void SkPaint::setStrikeThruText(bool doStrikeThru) |
| 164 | { |
| 165 | this->setFlags(SkSetClearMask(fFlags, doStrikeThru, kStrikeThruText_Flag)); |
| 166 | } |
| 167 | |
| 168 | void SkPaint::setFakeBoldText(bool doFakeBold) |
| 169 | { |
| 170 | this->setFlags(SkSetClearMask(fFlags, doFakeBold, kFakeBoldText_Flag)); |
| 171 | } |
| 172 | |
| 173 | void SkPaint::setDevKernText(bool doDevKern) |
| 174 | { |
| 175 | this->setFlags(SkSetClearMask(fFlags, doDevKern, kDevKernText_Flag)); |
| 176 | } |
| 177 | |
| 178 | void SkPaint::setFilterBitmap(bool doFilter) |
| 179 | { |
| 180 | this->setFlags(SkSetClearMask(fFlags, doFilter, kFilterBitmap_Flag)); |
| 181 | } |
| 182 | |
| 183 | void SkPaint::setStyle(Style style) |
| 184 | { |
| 185 | if ((unsigned)style < kStyleCount) |
| 186 | fStyle = style; |
| 187 | #ifdef SK_DEBUG |
| 188 | else |
| 189 | SkDebugf("SkPaint::setStyle(%d) out of range\n", style); |
| 190 | #endif |
| 191 | } |
| 192 | |
| 193 | void SkPaint::setColor(SkColor color) |
| 194 | { |
| 195 | fColor = color; |
| 196 | } |
| 197 | |
| 198 | void SkPaint::setAlpha(U8CPU a) |
| 199 | { |
| 200 | fColor = SkColorSetARGB(a, SkColorGetR(fColor), SkColorGetG(fColor), SkColorGetB(fColor)); |
| 201 | } |
| 202 | |
| 203 | void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) |
| 204 | { |
| 205 | fColor = SkColorSetARGB(a, r, g, b); |
| 206 | } |
| 207 | |
| 208 | void SkPaint::setStrokeWidth(SkScalar width) |
| 209 | { |
| 210 | if (width >= 0) |
| 211 | fWidth = width; |
| 212 | #ifdef SK_DEBUG |
| 213 | else |
| 214 | SkDebugf("SkPaint::setStrokeWidth() called with negative value\n"); |
| 215 | #endif |
| 216 | } |
| 217 | |
| 218 | void SkPaint::setStrokeMiter(SkScalar limit) |
| 219 | { |
| 220 | if (limit >= 0) |
| 221 | fMiterLimit = limit; |
| 222 | #ifdef SK_DEBUG |
| 223 | else |
| 224 | SkDebugf("SkPaint::setStrokeMiter() called with negative value\n"); |
| 225 | #endif |
| 226 | } |
| 227 | |
| 228 | void SkPaint::setStrokeCap(Cap ct) |
| 229 | { |
| 230 | if ((unsigned)ct < kCapCount) |
| 231 | fCapType = SkToU8(ct); |
| 232 | #ifdef SK_DEBUG |
| 233 | else |
| 234 | SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct); |
| 235 | #endif |
| 236 | } |
| 237 | |
| 238 | void SkPaint::setStrokeJoin(Join jt) |
| 239 | { |
| 240 | if ((unsigned)jt < kJoinCount) |
| 241 | fJoinType = SkToU8(jt); |
| 242 | #ifdef SK_DEBUG |
| 243 | else |
| 244 | SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt); |
| 245 | #endif |
| 246 | } |
| 247 | |
| 248 | ////////////////////////////////////////////////////////////////// |
| 249 | |
| 250 | void SkPaint::setTextAlign(Align align) |
| 251 | { |
| 252 | if ((unsigned)align < kAlignCount) |
| 253 | fTextAlign = SkToU8(align); |
| 254 | #ifdef SK_DEBUG |
| 255 | else |
| 256 | SkDebugf("SkPaint::setTextAlign(%d) out of range\n", align); |
| 257 | #endif |
| 258 | } |
| 259 | |
| 260 | void SkPaint::setTextSize(SkScalar ts) |
| 261 | { |
| 262 | if (ts > 0) |
| 263 | fTextSize = ts; |
| 264 | #ifdef SK_DEBUG |
| 265 | else |
| 266 | SkDebugf("SkPaint::setTextSize() called with non-positive value\n"); |
| 267 | #endif |
| 268 | } |
| 269 | |
| 270 | void SkPaint::setTextScaleX(SkScalar scaleX) |
| 271 | { |
| 272 | fTextScaleX = scaleX; |
| 273 | } |
| 274 | |
| 275 | void SkPaint::setTextSkewX(SkScalar skewX) |
| 276 | { |
| 277 | fTextSkewX = skewX; |
| 278 | } |
| 279 | |
| 280 | void SkPaint::setTextEncoding(TextEncoding encoding) |
| 281 | { |
| 282 | if ((unsigned)encoding <= kGlyphID_TextEncoding) |
| 283 | fTextEncoding = encoding; |
| 284 | #ifdef SK_DEBUG |
| 285 | else |
| 286 | SkDebugf("SkPaint::setTextEncoding(%d) out of range\n", encoding); |
| 287 | #endif |
| 288 | } |
| 289 | |
| 290 | /////////////////////////////////////////////////////////////////////////////////////// |
| 291 | |
| 292 | SkTypeface* SkPaint::setTypeface(SkTypeface* font) |
| 293 | { |
| 294 | SkRefCnt_SafeAssign(fTypeface, font); |
| 295 | return font; |
| 296 | } |
| 297 | |
| 298 | SkRasterizer* SkPaint::setRasterizer(SkRasterizer* r) |
| 299 | { |
| 300 | SkRefCnt_SafeAssign(fRasterizer, r); |
| 301 | return r; |
| 302 | } |
| 303 | |
| 304 | SkDrawLooper* SkPaint::setLooper(SkDrawLooper* looper) |
| 305 | { |
| 306 | SkRefCnt_SafeAssign(fLooper, looper); |
| 307 | return looper; |
| 308 | } |
| 309 | |
| 310 | /////////////////////////////////////////////////////////////////////////////// |
| 311 | |
| 312 | #include "SkGlyphCache.h" |
| 313 | #include "SkUtils.h" |
| 314 | |
| 315 | int SkPaint::textToGlyphs(const void* textData, size_t byteLength, |
| 316 | uint16_t glyphs[]) const { |
| 317 | if (byteLength == 0) { |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | SkASSERT(textData != NULL); |
| 322 | |
| 323 | if (NULL == glyphs) { |
| 324 | switch (this->getTextEncoding()) { |
| 325 | case kUTF8_TextEncoding: |
| 326 | return SkUTF8_CountUnichars((const char*)textData, byteLength); |
| 327 | case kUTF16_TextEncoding: |
| 328 | return SkUTF16_CountUnichars((const uint16_t*)textData, |
| 329 | byteLength >> 1); |
| 330 | case kGlyphID_TextEncoding: |
| 331 | return byteLength >> 1; |
| 332 | default: |
| 333 | SkASSERT(!"unknown text encoding"); |
| 334 | } |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | // if we get here, we have a valid glyphs[] array, so time to fill it in |
| 339 | |
| 340 | // handle this encoding before the setup for the glyphcache |
| 341 | if (this->getTextEncoding() == kGlyphID_TextEncoding) { |
| 342 | // we want to ignore the low bit of byteLength |
| 343 | memcpy(glyphs, textData, byteLength >> 1 << 1); |
| 344 | return byteLength >> 1; |
| 345 | } |
| 346 | |
| 347 | SkAutoGlyphCache autoCache(*this, NULL); |
| 348 | SkGlyphCache* cache = autoCache.getCache(); |
| 349 | |
| 350 | const char* text = (const char*)textData; |
| 351 | const char* stop = text + byteLength; |
| 352 | uint16_t* gptr = glyphs; |
| 353 | |
| 354 | switch (this->getTextEncoding()) { |
| 355 | case SkPaint::kUTF8_TextEncoding: |
| 356 | while (text < stop) { |
| 357 | *gptr++ = cache->unicharToGlyph(SkUTF8_NextUnichar(&text)); |
| 358 | } |
| 359 | break; |
| 360 | case SkPaint::kUTF16_TextEncoding: { |
| 361 | const uint16_t* text16 = (const uint16_t*)text; |
| 362 | const uint16_t* stop16 = (const uint16_t*)stop; |
| 363 | while (text16 < stop16) { |
| 364 | *gptr++ = cache->unicharToGlyph(SkUTF16_NextUnichar(&text16)); |
| 365 | } |
| 366 | break; |
| 367 | } |
| 368 | default: |
| 369 | SkASSERT(!"unknown text encoding"); |
| 370 | } |
| 371 | return gptr - glyphs; |
| 372 | } |
| 373 | |
| 374 | /////////////////////////////////////////////////////////////////////////////// |
| 375 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 376 | static const SkGlyph& sk_getMetrics_utf8_next(SkGlyphCache* cache, const char** text) |
| 377 | { |
| 378 | SkASSERT(cache != NULL); |
| 379 | SkASSERT(text != NULL); |
| 380 | |
| 381 | return cache->getUnicharMetrics(SkUTF8_NextUnichar(text)); |
| 382 | } |
| 383 | |
| 384 | static const SkGlyph& sk_getMetrics_utf8_prev(SkGlyphCache* cache, const char** text) |
| 385 | { |
| 386 | SkASSERT(cache != NULL); |
| 387 | SkASSERT(text != NULL); |
| 388 | |
| 389 | return cache->getUnicharMetrics(SkUTF8_PrevUnichar(text)); |
| 390 | } |
| 391 | |
| 392 | static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache, const char** text) |
| 393 | { |
| 394 | SkASSERT(cache != NULL); |
| 395 | SkASSERT(text != NULL); |
| 396 | |
| 397 | return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text)); |
| 398 | } |
| 399 | |
| 400 | static const SkGlyph& sk_getMetrics_utf16_prev(SkGlyphCache* cache, const char** text) |
| 401 | { |
| 402 | SkASSERT(cache != NULL); |
| 403 | SkASSERT(text != NULL); |
| 404 | |
| 405 | return cache->getUnicharMetrics(SkUTF16_PrevUnichar((const uint16_t**)text)); |
| 406 | } |
| 407 | |
| 408 | static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache, const char** text) |
| 409 | { |
| 410 | SkASSERT(cache != NULL); |
| 411 | SkASSERT(text != NULL); |
| 412 | |
| 413 | const uint16_t* ptr = *(const uint16_t**)text; |
| 414 | unsigned glyphID = *ptr; |
| 415 | ptr += 1; |
| 416 | *text = (const char*)ptr; |
| 417 | return cache->getGlyphIDMetrics(glyphID); |
| 418 | } |
| 419 | |
| 420 | static const SkGlyph& sk_getMetrics_glyph_prev(SkGlyphCache* cache, const char** text) |
| 421 | { |
| 422 | SkASSERT(cache != NULL); |
| 423 | SkASSERT(text != NULL); |
| 424 | |
| 425 | const uint16_t* ptr = *(const uint16_t**)text; |
| 426 | ptr -= 1; |
| 427 | unsigned glyphID = *ptr; |
| 428 | *text = (const char*)ptr; |
| 429 | return cache->getGlyphIDMetrics(glyphID); |
| 430 | } |
| 431 | |
| 432 | /// |
| 433 | |
| 434 | static const SkGlyph& sk_getAdvance_utf8_next(SkGlyphCache* cache, const char** text) |
| 435 | { |
| 436 | SkASSERT(cache != NULL); |
| 437 | SkASSERT(text != NULL); |
| 438 | |
| 439 | return cache->getUnicharAdvance(SkUTF8_NextUnichar(text)); |
| 440 | } |
| 441 | |
| 442 | static const SkGlyph& sk_getAdvance_utf8_prev(SkGlyphCache* cache, const char** text) |
| 443 | { |
| 444 | SkASSERT(cache != NULL); |
| 445 | SkASSERT(text != NULL); |
| 446 | |
| 447 | return cache->getUnicharAdvance(SkUTF8_PrevUnichar(text)); |
| 448 | } |
| 449 | |
| 450 | static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache, const char** text) |
| 451 | { |
| 452 | SkASSERT(cache != NULL); |
| 453 | SkASSERT(text != NULL); |
| 454 | |
| 455 | return cache->getUnicharAdvance(SkUTF16_NextUnichar((const uint16_t**)text)); |
| 456 | } |
| 457 | |
| 458 | static const SkGlyph& sk_getAdvance_utf16_prev(SkGlyphCache* cache, const char** text) |
| 459 | { |
| 460 | SkASSERT(cache != NULL); |
| 461 | SkASSERT(text != NULL); |
| 462 | |
| 463 | return cache->getUnicharAdvance(SkUTF16_PrevUnichar((const uint16_t**)text)); |
| 464 | } |
| 465 | |
| 466 | static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache, const char** text) |
| 467 | { |
| 468 | SkASSERT(cache != NULL); |
| 469 | SkASSERT(text != NULL); |
| 470 | |
| 471 | const uint16_t* ptr = *(const uint16_t**)text; |
| 472 | unsigned glyphID = *ptr; |
| 473 | ptr += 1; |
| 474 | *text = (const char*)ptr; |
| 475 | return cache->getGlyphIDAdvance(glyphID); |
| 476 | } |
| 477 | |
| 478 | static const SkGlyph& sk_getAdvance_glyph_prev(SkGlyphCache* cache, const char** text) |
| 479 | { |
| 480 | SkASSERT(cache != NULL); |
| 481 | SkASSERT(text != NULL); |
| 482 | |
| 483 | const uint16_t* ptr = *(const uint16_t**)text; |
| 484 | ptr -= 1; |
| 485 | unsigned glyphID = *ptr; |
| 486 | *text = (const char*)ptr; |
| 487 | return cache->getGlyphIDAdvance(glyphID); |
| 488 | } |
| 489 | |
| 490 | SkMeasureCacheProc SkPaint::getMeasureCacheProc(TextBufferDirection tbd, |
| 491 | bool needFullMetrics) const |
| 492 | { |
| 493 | static const SkMeasureCacheProc gMeasureCacheProcs[] = { |
| 494 | sk_getMetrics_utf8_next, |
| 495 | sk_getMetrics_utf16_next, |
| 496 | sk_getMetrics_glyph_next, |
| 497 | |
| 498 | sk_getMetrics_utf8_prev, |
| 499 | sk_getMetrics_utf16_prev, |
| 500 | sk_getMetrics_glyph_prev, |
| 501 | |
| 502 | sk_getAdvance_utf8_next, |
| 503 | sk_getAdvance_utf16_next, |
| 504 | sk_getAdvance_glyph_next, |
| 505 | |
| 506 | sk_getAdvance_utf8_prev, |
| 507 | sk_getAdvance_utf16_prev, |
| 508 | sk_getAdvance_glyph_prev |
| 509 | }; |
| 510 | |
| 511 | unsigned index = this->getTextEncoding(); |
| 512 | |
| 513 | if (kBackward_TextBufferDirection == tbd) |
| 514 | index += 3; |
| 515 | if (!needFullMetrics && !this->isDevKernText()) |
| 516 | index += 6; |
| 517 | |
| 518 | SkASSERT(index < SK_ARRAY_COUNT(gMeasureCacheProcs)); |
| 519 | return gMeasureCacheProcs[index]; |
| 520 | } |
| 521 | |
| 522 | /////////////////////////////////////////////////////////////////////////////// |
| 523 | |
| 524 | static const SkGlyph& sk_getMetrics_utf8_00(SkGlyphCache* cache, |
| 525 | const char** text, SkFixed, SkFixed) |
| 526 | { |
| 527 | SkASSERT(cache != NULL); |
| 528 | SkASSERT(text != NULL); |
| 529 | |
| 530 | return cache->getUnicharMetrics(SkUTF8_NextUnichar(text)); |
| 531 | } |
| 532 | |
| 533 | static const SkGlyph& sk_getMetrics_utf8_xy(SkGlyphCache* cache, |
| 534 | const char** text, SkFixed x, SkFixed y) |
| 535 | { |
| 536 | SkASSERT(cache != NULL); |
| 537 | SkASSERT(text != NULL); |
| 538 | |
| 539 | return cache->getUnicharMetrics(SkUTF8_NextUnichar(text), x, y); |
| 540 | } |
| 541 | |
| 542 | static const SkGlyph& sk_getMetrics_utf16_00(SkGlyphCache* cache, const char** text, |
| 543 | SkFixed, SkFixed) |
| 544 | { |
| 545 | SkASSERT(cache != NULL); |
| 546 | SkASSERT(text != NULL); |
| 547 | |
| 548 | return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text)); |
| 549 | } |
| 550 | |
| 551 | static const SkGlyph& sk_getMetrics_utf16_xy(SkGlyphCache* cache, |
| 552 | const char** text, SkFixed x, SkFixed y) |
| 553 | { |
| 554 | SkASSERT(cache != NULL); |
| 555 | SkASSERT(text != NULL); |
| 556 | |
| 557 | return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text), |
| 558 | x, y); |
| 559 | } |
| 560 | |
| 561 | static const SkGlyph& sk_getMetrics_glyph_00(SkGlyphCache* cache, const char** text, |
| 562 | SkFixed, SkFixed) |
| 563 | { |
| 564 | SkASSERT(cache != NULL); |
| 565 | SkASSERT(text != NULL); |
| 566 | |
| 567 | const uint16_t* ptr = *(const uint16_t**)text; |
| 568 | unsigned glyphID = *ptr; |
| 569 | ptr += 1; |
| 570 | *text = (const char*)ptr; |
| 571 | return cache->getGlyphIDMetrics(glyphID); |
| 572 | } |
| 573 | |
| 574 | static const SkGlyph& sk_getMetrics_glyph_xy(SkGlyphCache* cache, |
| 575 | const char** text, SkFixed x, SkFixed y) |
| 576 | { |
| 577 | SkASSERT(cache != NULL); |
| 578 | SkASSERT(text != NULL); |
| 579 | |
| 580 | const uint16_t* ptr = *(const uint16_t**)text; |
| 581 | unsigned glyphID = *ptr; |
| 582 | ptr += 1; |
| 583 | *text = (const char*)ptr; |
| 584 | return cache->getGlyphIDMetrics(glyphID, x, y); |
| 585 | } |
| 586 | |
| 587 | SkDrawCacheProc SkPaint::getDrawCacheProc() const |
| 588 | { |
| 589 | static const SkDrawCacheProc gDrawCacheProcs[] = { |
| 590 | sk_getMetrics_utf8_00, |
| 591 | sk_getMetrics_utf16_00, |
| 592 | sk_getMetrics_glyph_00, |
| 593 | |
| 594 | sk_getMetrics_utf8_xy, |
| 595 | sk_getMetrics_utf16_xy, |
| 596 | sk_getMetrics_glyph_xy |
| 597 | }; |
| 598 | |
| 599 | unsigned index = this->getTextEncoding(); |
| 600 | if (fFlags & kSubpixelText_Flag) |
| 601 | index += 3; |
| 602 | |
| 603 | SkASSERT(index < SK_ARRAY_COUNT(gDrawCacheProcs)); |
| 604 | return gDrawCacheProcs[index]; |
| 605 | } |
| 606 | |
| 607 | /////////////////////////////////////////////////////////////////////////////// |
| 608 | |
| 609 | class SkAutoRestorePaintTextSizeAndFrame { |
| 610 | public: |
| 611 | SkAutoRestorePaintTextSizeAndFrame(const SkPaint* paint) : fPaint((SkPaint*)paint) |
| 612 | { |
| 613 | fTextSize = paint->getTextSize(); |
| 614 | fStyle = paint->getStyle(); |
| 615 | fPaint->setStyle(SkPaint::kFill_Style); |
| 616 | } |
| 617 | ~SkAutoRestorePaintTextSizeAndFrame() |
| 618 | { |
| 619 | fPaint->setStyle(fStyle); |
| 620 | fPaint->setTextSize(fTextSize); |
| 621 | } |
| 622 | |
| 623 | private: |
| 624 | SkPaint* fPaint; |
| 625 | SkScalar fTextSize; |
| 626 | SkPaint::Style fStyle; |
| 627 | }; |
| 628 | |
| 629 | static void set_bounds(const SkGlyph& g, SkRect* bounds) |
| 630 | { |
| 631 | bounds->set(SkIntToScalar(g.fLeft), |
| 632 | SkIntToScalar(g.fTop), |
| 633 | SkIntToScalar(g.fLeft + g.fWidth), |
| 634 | SkIntToScalar(g.fTop + g.fHeight)); |
| 635 | } |
| 636 | |
| 637 | static void join_bounds(const SkGlyph& g, SkRect* bounds, SkFixed dx) |
| 638 | { |
| 639 | SkScalar sx = SkFixedToScalar(dx); |
| 640 | bounds->join(SkIntToScalar(g.fLeft) + sx, |
| 641 | SkIntToScalar(g.fTop), |
| 642 | SkIntToScalar(g.fLeft + g.fWidth) + sx, |
| 643 | SkIntToScalar(g.fTop + g.fHeight)); |
| 644 | } |
| 645 | |
| 646 | SkScalar SkPaint::measure_text(SkGlyphCache* cache, |
| 647 | const char* text, size_t byteLength, |
| 648 | int* count, SkRect* bounds) const |
| 649 | { |
| 650 | SkASSERT(count); |
| 651 | if (byteLength == 0) |
| 652 | { |
| 653 | *count = 0; |
| 654 | if (bounds) |
| 655 | bounds->setEmpty(); |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | SkMeasureCacheProc glyphCacheProc; |
| 660 | glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection, |
| 661 | NULL != bounds); |
| 662 | |
| 663 | int n = 1; |
| 664 | const char* stop = (const char*)text + byteLength; |
| 665 | const SkGlyph* g = &glyphCacheProc(cache, &text); |
| 666 | SkFixed x = g->fAdvanceX; |
| 667 | |
| 668 | SkAutoKern autokern; |
| 669 | |
| 670 | if (NULL == bounds) |
| 671 | { |
| 672 | if (this->isDevKernText()) |
| 673 | { |
| 674 | int rsb; |
| 675 | for (; text < stop; n++) { |
| 676 | rsb = g->fRsbDelta; |
| 677 | g = &glyphCacheProc(cache, &text); |
| 678 | x += SkAutoKern_AdjustF(rsb, g->fLsbDelta) + g->fAdvanceX; |
| 679 | } |
| 680 | } |
| 681 | else |
| 682 | { |
| 683 | for (; text < stop; n++) { |
| 684 | x += glyphCacheProc(cache, &text).fAdvanceX; |
| 685 | } |
| 686 | } |
| 687 | } |
| 688 | else |
| 689 | { |
| 690 | set_bounds(*g, bounds); |
| 691 | if (this->isDevKernText()) |
| 692 | { |
| 693 | int rsb; |
| 694 | for (; text < stop; n++) { |
| 695 | rsb = g->fRsbDelta; |
| 696 | g = &glyphCacheProc(cache, &text); |
| 697 | x += SkAutoKern_AdjustF(rsb, g->fLsbDelta); |
| 698 | join_bounds(*g, bounds, x); |
| 699 | x += g->fAdvanceX; |
| 700 | } |
| 701 | } |
| 702 | else |
| 703 | { |
| 704 | for (; text < stop; n++) { |
| 705 | g = &glyphCacheProc(cache, &text); |
| 706 | join_bounds(*g, bounds, x); |
| 707 | x += g->fAdvanceX; |
| 708 | } |
| 709 | } |
| 710 | } |
| 711 | SkASSERT(text == stop); |
| 712 | |
| 713 | *count = n; |
| 714 | return SkFixedToScalar(x); |
| 715 | } |
| 716 | |
| 717 | SkScalar SkPaint::measureText(const void* textData, size_t length, |
| 718 | SkRect* bounds, SkScalar zoom) const |
| 719 | { |
| 720 | const char* text = (const char*)textData; |
| 721 | SkASSERT(text != NULL || length == 0); |
| 722 | |
| 723 | SkScalar scale = 0; |
| 724 | SkAutoRestorePaintTextSizeAndFrame restore(this); |
| 725 | |
| 726 | if (this->isLinearText()) |
| 727 | { |
| 728 | scale = fTextSize / kCanonicalTextSizeForPaths; |
| 729 | // this gets restored by restore |
| 730 | ((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths)); |
| 731 | } |
| 732 | |
| 733 | SkMatrix zoomMatrix, *zoomPtr = NULL; |
| 734 | if (zoom) |
| 735 | { |
| 736 | zoomMatrix.setScale(zoom, zoom); |
| 737 | zoomPtr = &zoomMatrix; |
| 738 | } |
| 739 | |
| 740 | SkAutoGlyphCache autoCache(*this, zoomPtr); |
| 741 | SkGlyphCache* cache = autoCache.getCache(); |
| 742 | |
| 743 | SkScalar width = 0; |
| 744 | |
| 745 | if (length > 0) |
| 746 | { |
| 747 | int tempCount; |
| 748 | |
| 749 | width = this->measure_text(cache, text, length, &tempCount, bounds); |
| 750 | if (scale) |
| 751 | { |
| 752 | width = SkScalarMul(width, scale); |
| 753 | if (bounds) |
| 754 | { |
| 755 | bounds->fLeft = SkScalarMul(bounds->fLeft, scale); |
| 756 | bounds->fTop = SkScalarMul(bounds->fTop, scale); |
| 757 | bounds->fRight = SkScalarMul(bounds->fRight, scale); |
| 758 | bounds->fBottom = SkScalarMul(bounds->fBottom, scale); |
| 759 | } |
| 760 | } |
| 761 | } |
| 762 | return width; |
| 763 | } |
| 764 | |
| 765 | typedef bool (*SkTextBufferPred)(const char* text, const char* stop); |
| 766 | |
| 767 | static bool forward_textBufferPred(const char* text, const char* stop) |
| 768 | { |
| 769 | return text < stop; |
| 770 | } |
| 771 | |
| 772 | static bool backward_textBufferPred(const char* text, const char* stop) |
| 773 | { |
| 774 | return text > stop; |
| 775 | } |
| 776 | |
| 777 | static SkTextBufferPred chooseTextBufferPred(SkPaint::TextBufferDirection tbd, |
| 778 | const char** text, size_t length, const char** stop) |
| 779 | { |
| 780 | if (SkPaint::kForward_TextBufferDirection == tbd) |
| 781 | { |
| 782 | *stop = *text + length; |
| 783 | return forward_textBufferPred; |
| 784 | } |
| 785 | else |
| 786 | { |
| 787 | // text should point to the end of the buffer, and stop to the beginning |
| 788 | *stop = *text; |
| 789 | *text += length; |
| 790 | return backward_textBufferPred; |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth, |
| 795 | SkScalar* measuredWidth, |
| 796 | TextBufferDirection tbd) const |
| 797 | { |
| 798 | if (0 == length || 0 >= maxWidth) |
| 799 | { |
| 800 | if (measuredWidth) |
| 801 | *measuredWidth = 0; |
| 802 | return 0; |
| 803 | } |
| 804 | |
| 805 | SkASSERT(textD != NULL); |
| 806 | const char* text = (const char*)textD; |
| 807 | |
| 808 | SkScalar scale = 0; |
| 809 | SkAutoRestorePaintTextSizeAndFrame restore(this); |
| 810 | |
| 811 | if (this->isLinearText()) |
| 812 | { |
| 813 | scale = fTextSize / kCanonicalTextSizeForPaths; |
| 814 | // this gets restored by restore |
| 815 | ((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths)); |
| 816 | } |
| 817 | |
| 818 | SkAutoGlyphCache autoCache(*this, NULL); |
| 819 | SkGlyphCache* cache = autoCache.getCache(); |
| 820 | |
| 821 | SkMeasureCacheProc glyphCacheProc = this->getMeasureCacheProc(tbd, false); |
| 822 | const char* stop; |
| 823 | SkTextBufferPred pred = chooseTextBufferPred(tbd, &text, length, &stop); |
| 824 | SkFixed max = SkScalarToFixed(maxWidth); |
| 825 | SkFixed width = 0; |
| 826 | |
| 827 | SkAutoKern autokern; |
| 828 | |
| 829 | if (this->isDevKernText()) |
| 830 | { |
| 831 | int rsb = 0; |
| 832 | while (pred(text, stop)) |
| 833 | { |
| 834 | const char* curr = text; |
| 835 | const SkGlyph& g = glyphCacheProc(cache, &text); |
| 836 | SkFixed x = SkAutoKern_AdjustF(rsb, g.fLsbDelta) + g.fAdvanceX; |
| 837 | if ((width += x) > max) |
| 838 | { |
| 839 | width -= x; |
| 840 | text = curr; |
| 841 | break; |
| 842 | } |
| 843 | rsb = g.fRsbDelta; |
| 844 | } |
| 845 | } |
| 846 | else |
| 847 | { |
| 848 | while (pred(text, stop)) |
| 849 | { |
| 850 | const char* curr = text; |
| 851 | SkFixed x = glyphCacheProc(cache, &text).fAdvanceX; |
| 852 | if ((width += x) > max) |
| 853 | { |
| 854 | width -= x; |
| 855 | text = curr; |
| 856 | break; |
| 857 | } |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | if (measuredWidth) |
| 862 | { |
| 863 | |
| 864 | SkScalar scalarWidth = SkFixedToScalar(width); |
| 865 | if (scale) |
| 866 | scalarWidth = SkScalarMul(scalarWidth, scale); |
| 867 | *measuredWidth = scalarWidth; |
| 868 | } |
| 869 | |
| 870 | // return the number of bytes measured |
| 871 | return (kForward_TextBufferDirection == tbd) ? |
| 872 | text - stop + length : stop - text + length; |
| 873 | } |
| 874 | |
| 875 | /////////////////////////////////////////////////////////////////////////////// |
| 876 | |
| 877 | static bool FontMetricsCacheProc(const SkGlyphCache* cache, void* context) |
| 878 | { |
| 879 | *(SkPaint::FontMetrics*)context = cache->getFontMetricsY(); |
| 880 | return false; // don't detach the cache |
| 881 | } |
| 882 | |
| 883 | static void FontMetricsDescProc(const SkDescriptor* desc, void* context) |
| 884 | { |
| 885 | SkGlyphCache::VisitCache(desc, FontMetricsCacheProc, context); |
| 886 | } |
| 887 | |
| 888 | SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const |
| 889 | { |
| 890 | SkScalar scale = 0; |
| 891 | SkAutoRestorePaintTextSizeAndFrame restore(this); |
| 892 | |
| 893 | if (this->isLinearText()) |
| 894 | { |
| 895 | scale = fTextSize / kCanonicalTextSizeForPaths; |
| 896 | // this gets restored by restore |
| 897 | ((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths)); |
| 898 | } |
| 899 | |
| 900 | SkMatrix zoomMatrix, *zoomPtr = NULL; |
| 901 | if (zoom) |
| 902 | { |
| 903 | zoomMatrix.setScale(zoom, zoom); |
| 904 | zoomPtr = &zoomMatrix; |
| 905 | } |
| 906 | |
| 907 | #if 0 |
| 908 | SkAutoGlyphCache autoCache(*this, zoomPtr); |
| 909 | SkGlyphCache* cache = autoCache.getCache(); |
| 910 | const FontMetrics& my = cache->getFontMetricsY(); |
| 911 | #endif |
| 912 | FontMetrics storage; |
| 913 | if (NULL == metrics) |
| 914 | metrics = &storage; |
| 915 | |
| 916 | this->descriptorProc(zoomPtr, FontMetricsDescProc, metrics); |
| 917 | |
| 918 | if (scale) |
| 919 | { |
| 920 | metrics->fTop = SkScalarMul(metrics->fTop, scale); |
| 921 | metrics->fAscent = SkScalarMul(metrics->fAscent, scale); |
| 922 | metrics->fDescent = SkScalarMul(metrics->fDescent, scale); |
| 923 | metrics->fBottom = SkScalarMul(metrics->fBottom, scale); |
| 924 | metrics->fLeading = SkScalarMul(metrics->fLeading, scale); |
| 925 | } |
| 926 | return metrics->fDescent - metrics->fAscent + metrics->fLeading; |
| 927 | } |
| 928 | |
| 929 | //////////////////////////////////////////////////////////////////////////////////////////// |
| 930 | |
| 931 | static void set_bounds(const SkGlyph& g, SkRect* bounds, SkScalar scale) |
| 932 | { |
| 933 | bounds->set(g.fLeft * scale, |
| 934 | g.fTop * scale, |
| 935 | (g.fLeft + g.fWidth) * scale, |
| 936 | (g.fTop + g.fHeight) * scale); |
| 937 | } |
| 938 | |
| 939 | int SkPaint::getTextWidths(const void* textData, size_t byteLength, SkScalar widths[], |
| 940 | SkRect bounds[]) const |
| 941 | { |
| 942 | if (0 == byteLength) |
| 943 | return 0; |
| 944 | |
| 945 | SkASSERT(NULL != textData); |
| 946 | |
| 947 | if (NULL == widths && NULL == bounds) |
| 948 | return this->countText(textData, byteLength); |
| 949 | |
| 950 | SkAutoRestorePaintTextSizeAndFrame restore(this); |
| 951 | SkScalar scale = 0; |
| 952 | |
| 953 | if (this->isLinearText()) |
| 954 | { |
| 955 | scale = fTextSize / kCanonicalTextSizeForPaths; |
| 956 | // this gets restored by restore |
| 957 | ((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths)); |
| 958 | } |
| 959 | |
| 960 | SkAutoGlyphCache autoCache(*this, NULL); |
| 961 | SkGlyphCache* cache = autoCache.getCache(); |
| 962 | SkMeasureCacheProc glyphCacheProc; |
| 963 | glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection, |
| 964 | NULL != bounds); |
| 965 | |
| 966 | const char* text = (const char*)textData; |
| 967 | const char* stop = text + byteLength; |
| 968 | int count = 0; |
| 969 | |
| 970 | if (this->isDevKernText()) |
| 971 | { |
| 972 | // we adjust the widths returned here through auto-kerning |
| 973 | SkAutoKern autokern; |
| 974 | SkFixed prevWidth = 0; |
| 975 | |
| 976 | if (scale) { |
| 977 | while (text < stop) { |
| 978 | const SkGlyph& g = glyphCacheProc(cache, &text); |
| 979 | if (widths) { |
| 980 | SkFixed adjust = autokern.adjust(g); |
| 981 | |
| 982 | if (count > 0) { |
| 983 | SkScalar w = SkFixedToScalar(prevWidth + adjust); |
| 984 | *widths++ = SkScalarMul(w, scale); |
| 985 | } |
| 986 | prevWidth = g.fAdvanceX; |
| 987 | } |
| 988 | if (bounds) { |
| 989 | set_bounds(g, bounds++, scale); |
| 990 | } |
| 991 | ++count; |
| 992 | } |
| 993 | if (count > 0 && widths) { |
| 994 | *widths = SkScalarMul(SkFixedToScalar(prevWidth), scale); |
| 995 | } |
| 996 | } else { |
| 997 | while (text < stop) { |
| 998 | const SkGlyph& g = glyphCacheProc(cache, &text); |
| 999 | if (widths) { |
| 1000 | SkFixed adjust = autokern.adjust(g); |
| 1001 | |
| 1002 | if (count > 0) { |
| 1003 | *widths++ = SkFixedToScalar(prevWidth + adjust); |
| 1004 | } |
| 1005 | prevWidth = g.fAdvanceX; |
| 1006 | } |
| 1007 | if (bounds) { |
| 1008 | set_bounds(g, bounds++); |
| 1009 | } |
| 1010 | ++count; |
| 1011 | } |
| 1012 | if (count > 0 && widths) { |
| 1013 | *widths = SkFixedToScalar(prevWidth); |
| 1014 | } |
| 1015 | } |
| 1016 | } else { // no devkern |
| 1017 | if (scale) { |
| 1018 | while (text < stop) { |
| 1019 | const SkGlyph& g = glyphCacheProc(cache, &text); |
| 1020 | if (widths) { |
| 1021 | *widths++ = SkScalarMul(SkFixedToScalar(g.fAdvanceX), |
| 1022 | scale); |
| 1023 | } |
| 1024 | if (bounds) { |
| 1025 | set_bounds(g, bounds++, scale); |
| 1026 | } |
| 1027 | ++count; |
| 1028 | } |
| 1029 | } else { |
| 1030 | while (text < stop) { |
| 1031 | const SkGlyph& g = glyphCacheProc(cache, &text); |
| 1032 | if (widths) { |
| 1033 | *widths++ = SkFixedToScalar(g.fAdvanceX); |
| 1034 | } |
| 1035 | if (bounds) { |
| 1036 | set_bounds(g, bounds++); |
| 1037 | } |
| 1038 | ++count; |
| 1039 | } |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | SkASSERT(text == stop); |
| 1044 | return count; |
| 1045 | } |
| 1046 | |
| 1047 | //////////////////////////////////////////////////////////////////////////////////////////// |
| 1048 | |
| 1049 | #include "SkDraw.h" |
| 1050 | |
| 1051 | void SkPaint::getTextPath(const void* textData, size_t length, SkScalar x, SkScalar y, SkPath* path) const |
| 1052 | { |
| 1053 | const char* text = (const char*)textData; |
| 1054 | SkASSERT(length == 0 || text != NULL); |
| 1055 | if (text == NULL || length == 0 || path == NULL) |
| 1056 | return; |
| 1057 | |
| 1058 | SkTextToPathIter iter(text, length, *this, false, true); |
| 1059 | SkMatrix matrix; |
| 1060 | SkScalar prevXPos = 0; |
| 1061 | |
| 1062 | matrix.setScale(iter.getPathScale(), iter.getPathScale()); |
| 1063 | matrix.postTranslate(x, y); |
| 1064 | path->reset(); |
| 1065 | |
| 1066 | SkScalar xpos; |
| 1067 | const SkPath* iterPath; |
| 1068 | while ((iterPath = iter.next(&xpos)) != NULL) |
| 1069 | { |
| 1070 | matrix.postTranslate(xpos - prevXPos, 0); |
| 1071 | path->addPath(*iterPath, matrix); |
| 1072 | prevXPos = xpos; |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | static void add_flattenable(SkDescriptor* desc, uint32_t tag, |
| 1077 | SkFlattenableWriteBuffer* buffer) { |
| 1078 | buffer->flatten(desc->addEntry(tag, buffer->size(), NULL)); |
| 1079 | } |
| 1080 | |
| 1081 | /* |
| 1082 | * interpolates to find the right value for key, in the function represented by the 'length' number of pairs: (keys[i], values[i]) |
| 1083 | inspired by a desire to change the multiplier for thickness in fakebold |
| 1084 | therefore, i assumed number of pairs (length) will be small, so a linear search is sufficient |
| 1085 | repeated keys are allowed for discontinuous functions (so long as keys is monotonically increasing), and if |
| 1086 | key is the value of a repeated scalar in keys, the first one will be used |
| 1087 | - this may change if a binary search is used |
| 1088 | - also, this ensures that there is no divide by zero (an assert also checks for that) |
| 1089 | */ |
| 1090 | static SkScalar interpolate(SkScalar key, const SkScalar keys[], const SkScalar values[], int length) |
| 1091 | { |
| 1092 | |
| 1093 | SkASSERT(length > 0); |
| 1094 | SkASSERT(keys != NULL); |
| 1095 | SkASSERT(values != NULL); |
| 1096 | #ifdef SK_DEBUG |
| 1097 | for (int i = 1; i < length; i++) |
| 1098 | SkASSERT(keys[i] >= keys[i-1]); |
| 1099 | #endif |
| 1100 | int right = 0; |
| 1101 | while (right < length && key > keys[right]) |
| 1102 | right++; |
| 1103 | //could use sentinal values to eliminate conditionals |
| 1104 | //i assume i am not in control of input values, so i want to make it simple |
| 1105 | if (length == right) |
| 1106 | return values[length-1]; |
| 1107 | if (0 == right) |
| 1108 | return values[0]; |
| 1109 | //otherwise, we interpolate between right-1 and right |
| 1110 | SkScalar rVal = values[right]; |
| 1111 | SkScalar lVal = values[right-1]; |
| 1112 | SkScalar rightKey = keys[right]; |
| 1113 | SkScalar leftKey = keys[right-1]; |
| 1114 | SkASSERT(rightKey != leftKey); |
| 1115 | //fractional amount which we will multiply by the difference in the left value and right value |
| 1116 | SkScalar fract = SkScalarDiv(key-leftKey,rightKey-leftKey); |
| 1117 | return lVal + SkScalarMul(fract, rVal-lVal); |
| 1118 | } |
| 1119 | |
| 1120 | //used for interpolating in fakeBold |
| 1121 | static const SkScalar pointSizes[] = { SkIntToScalar(9), SkIntToScalar(36) }; |
| 1122 | static const SkScalar multipliers[] = { SK_Scalar1/24, SK_Scalar1/32 }; |
| 1123 | |
| 1124 | static SkMask::Format computeMaskFormat(const SkPaint& paint) |
| 1125 | { |
| 1126 | uint32_t flags = paint.getFlags(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1127 | |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame^] | 1128 | if (flags & SkPaint::kLCDRenderText_Flag) |
| 1129 | #if defined(SK_BUILD_SUBPIXEL) |
| 1130 | return SkFontHost::GetSubpixelOrientation() == SkFontHost::kHorizontal_LCDOrientation ? |
| 1131 | SkMask::kHorizontalLCD_Format : SkMask::kVerticalLCD_Format; |
| 1132 | #else |
| 1133 | return SkMask::kA8_Format; |
| 1134 | #endif |
| 1135 | if (flags & SkPaint::kAntiAlias_Flag) |
| 1136 | return SkMask::kA8_Format; |
| 1137 | return SkMask::kBW_Format; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1138 | } |
| 1139 | |
| 1140 | void SkScalerContext::MakeRec(const SkPaint& paint, const SkMatrix* deviceMatrix, Rec* rec) |
| 1141 | { |
| 1142 | SkASSERT(deviceMatrix == NULL || (deviceMatrix->getType() & SkMatrix::kPerspective_Mask) == 0); |
| 1143 | |
| 1144 | rec->fFontID = SkTypeface::UniqueID(paint.getTypeface()); |
| 1145 | rec->fTextSize = paint.getTextSize(); |
| 1146 | rec->fPreScaleX = paint.getTextScaleX(); |
| 1147 | rec->fPreSkewX = paint.getTextSkewX(); |
| 1148 | |
| 1149 | if (deviceMatrix) |
| 1150 | { |
| 1151 | rec->fPost2x2[0][0] = deviceMatrix->getScaleX(); |
| 1152 | rec->fPost2x2[0][1] = deviceMatrix->getSkewX(); |
| 1153 | rec->fPost2x2[1][0] = deviceMatrix->getSkewY(); |
| 1154 | rec->fPost2x2[1][1] = deviceMatrix->getScaleY(); |
| 1155 | } |
| 1156 | else |
| 1157 | { |
| 1158 | rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1; |
| 1159 | rec->fPost2x2[0][1] = rec->fPost2x2[1][0] = 0; |
| 1160 | } |
| 1161 | |
| 1162 | SkPaint::Style style = paint.getStyle(); |
| 1163 | SkScalar strokeWidth = paint.getStrokeWidth(); |
| 1164 | |
| 1165 | if (paint.isFakeBoldText()) |
| 1166 | { |
| 1167 | SkScalar fakeBoldScale = interpolate(paint.getTextSize(), pointSizes, multipliers, 2); |
| 1168 | SkScalar extra = SkScalarMul(paint.getTextSize(), fakeBoldScale); |
| 1169 | |
| 1170 | if (style == SkPaint::kFill_Style) |
| 1171 | { |
| 1172 | style = SkPaint::kStrokeAndFill_Style; |
| 1173 | strokeWidth = extra; // ignore paint's strokeWidth if it was "fill" |
| 1174 | } |
| 1175 | else |
| 1176 | strokeWidth += extra; |
| 1177 | } |
| 1178 | |
| 1179 | unsigned flags = SkFontHost::ComputeGammaFlag(paint); |
| 1180 | |
| 1181 | if (paint.isDevKernText()) |
| 1182 | flags |= SkScalerContext::kDevKernText_Flag; |
| 1183 | |
| 1184 | if (style != SkPaint::kFill_Style && strokeWidth > 0) |
| 1185 | { |
| 1186 | rec->fFrameWidth = strokeWidth; |
| 1187 | rec->fMiterLimit = paint.getStrokeMiter(); |
| 1188 | rec->fStrokeJoin = SkToU8(paint.getStrokeJoin()); |
| 1189 | |
| 1190 | if (style == SkPaint::kStrokeAndFill_Style) |
| 1191 | flags |= SkScalerContext::kFrameAndFill_Flag; |
| 1192 | } |
| 1193 | else |
| 1194 | { |
| 1195 | rec->fFrameWidth = 0; |
| 1196 | rec->fMiterLimit = 0; |
| 1197 | rec->fStrokeJoin = 0; |
| 1198 | } |
| 1199 | |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame^] | 1200 | rec->fSubpixelPositioning = paint.isSubpixelText(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1201 | rec->fMaskFormat = SkToU8(computeMaskFormat(paint)); |
| 1202 | rec->fFlags = SkToU8(flags); |
agl@chromium.org | 309485b | 2009-07-21 17:41:32 +0000 | [diff] [blame^] | 1203 | rec->setHinting(paint.getHinting()); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | #define MIN_SIZE_FOR_EFFECT_BUFFER 1024 |
| 1207 | |
| 1208 | void SkPaint::descriptorProc(const SkMatrix* deviceMatrix, |
| 1209 | void (*proc)(const SkDescriptor*, void*), |
| 1210 | void* context) const |
| 1211 | { |
| 1212 | SkScalerContext::Rec rec; |
| 1213 | |
| 1214 | SkScalerContext::MakeRec(*this, deviceMatrix, &rec); |
| 1215 | |
| 1216 | size_t descSize = sizeof(rec); |
| 1217 | int entryCount = 1; |
| 1218 | SkPathEffect* pe = this->getPathEffect(); |
| 1219 | SkMaskFilter* mf = this->getMaskFilter(); |
| 1220 | SkRasterizer* ra = this->getRasterizer(); |
| 1221 | |
| 1222 | SkFlattenableWriteBuffer peBuffer(MIN_SIZE_FOR_EFFECT_BUFFER); |
| 1223 | SkFlattenableWriteBuffer mfBuffer(MIN_SIZE_FOR_EFFECT_BUFFER); |
| 1224 | SkFlattenableWriteBuffer raBuffer(MIN_SIZE_FOR_EFFECT_BUFFER); |
| 1225 | |
| 1226 | if (pe) { |
| 1227 | peBuffer.writeFlattenable(pe); |
| 1228 | descSize += peBuffer.size(); |
| 1229 | entryCount += 1; |
| 1230 | rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion |
| 1231 | // seems like we could support kLCD as well at this point... |
| 1232 | } |
| 1233 | if (mf) { |
| 1234 | mfBuffer.writeFlattenable(mf); |
| 1235 | descSize += mfBuffer.size(); |
| 1236 | entryCount += 1; |
| 1237 | rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing with maskfilters |
| 1238 | } |
| 1239 | if (ra) { |
| 1240 | raBuffer.writeFlattenable(ra); |
| 1241 | descSize += raBuffer.size(); |
| 1242 | entryCount += 1; |
| 1243 | rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion |
| 1244 | } |
| 1245 | descSize += SkDescriptor::ComputeOverhead(entryCount); |
| 1246 | |
| 1247 | SkAutoDescriptor ad(descSize); |
| 1248 | SkDescriptor* desc = ad.getDesc(); |
| 1249 | |
| 1250 | desc->init(); |
| 1251 | desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec); |
| 1252 | |
| 1253 | if (pe) { |
| 1254 | add_flattenable(desc, kPathEffect_SkDescriptorTag, &peBuffer); |
| 1255 | } |
| 1256 | if (mf) { |
| 1257 | add_flattenable(desc, kMaskFilter_SkDescriptorTag, &mfBuffer); |
| 1258 | } |
| 1259 | if (ra) { |
| 1260 | add_flattenable(desc, kRasterizer_SkDescriptorTag, &raBuffer); |
| 1261 | } |
| 1262 | |
| 1263 | SkASSERT(descSize == desc->getLength()); |
| 1264 | desc->computeChecksum(); |
| 1265 | |
| 1266 | proc(desc, context); |
| 1267 | } |
| 1268 | |
| 1269 | static void DetachDescProc(const SkDescriptor* desc, void* context) |
| 1270 | { |
| 1271 | *((SkGlyphCache**)context) = SkGlyphCache::DetachCache(desc); |
| 1272 | } |
| 1273 | |
| 1274 | SkGlyphCache* SkPaint::detachCache(const SkMatrix* deviceMatrix) const |
| 1275 | { |
| 1276 | SkGlyphCache* cache; |
| 1277 | this->descriptorProc(deviceMatrix, DetachDescProc, &cache); |
| 1278 | return cache; |
| 1279 | } |
| 1280 | |
| 1281 | /////////////////////////////////////////////////////////////////////////////// |
| 1282 | |
| 1283 | #include "SkStream.h" |
| 1284 | |
reed@android.com | aefd2bc | 2009-03-30 21:02:14 +0000 | [diff] [blame] | 1285 | static uintptr_t asint(const void* p) { |
| 1286 | return reinterpret_cast<uintptr_t>(p); |
| 1287 | } |
| 1288 | |
| 1289 | union Scalar32 { |
| 1290 | SkScalar fScalar; |
| 1291 | uint32_t f32; |
| 1292 | }; |
| 1293 | |
| 1294 | static uint32_t* write_scalar(uint32_t* ptr, SkScalar value) { |
| 1295 | SkASSERT(sizeof(SkScalar) == sizeof(uint32_t)); |
| 1296 | Scalar32 tmp; |
| 1297 | tmp.fScalar = value; |
| 1298 | *ptr = tmp.f32; |
| 1299 | return ptr + 1; |
| 1300 | } |
| 1301 | |
| 1302 | static SkScalar read_scalar(const uint32_t*& ptr) { |
| 1303 | SkASSERT(sizeof(SkScalar) == sizeof(uint32_t)); |
| 1304 | Scalar32 tmp; |
| 1305 | tmp.f32 = *ptr++; |
| 1306 | return tmp.fScalar; |
| 1307 | } |
| 1308 | |
| 1309 | static uint32_t pack_4(unsigned a, unsigned b, unsigned c, unsigned d) { |
| 1310 | SkASSERT(a == (uint8_t)a); |
| 1311 | SkASSERT(b == (uint8_t)b); |
| 1312 | SkASSERT(c == (uint8_t)c); |
| 1313 | SkASSERT(d == (uint8_t)d); |
| 1314 | return (a << 24) | (b << 16) | (c << 8) | d; |
| 1315 | } |
| 1316 | |
| 1317 | enum FlatFlags { |
| 1318 | kHasTypeface_FlatFlag = 0x01, |
| 1319 | kHasEffects_FlatFlag = 0x02 |
| 1320 | }; |
| 1321 | |
| 1322 | // The size of a flat paint's POD fields |
| 1323 | static const uint32_t kPODPaintSize = 5 * sizeof(SkScalar) + |
| 1324 | 1 * sizeof(SkColor) + |
| 1325 | 1 * sizeof(uint16_t) + |
| 1326 | 6 * sizeof(uint8_t); |
| 1327 | |
| 1328 | /* To save space/time, we analyze the paint, and write a truncated version of |
| 1329 | it if there are not tricky elements like shaders, etc. |
| 1330 | */ |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1331 | void SkPaint::flatten(SkFlattenableWriteBuffer& buffer) const { |
reed@android.com | aefd2bc | 2009-03-30 21:02:14 +0000 | [diff] [blame] | 1332 | uint8_t flatFlags = 0; |
| 1333 | if (this->getTypeface()) { |
| 1334 | flatFlags |= kHasTypeface_FlatFlag; |
| 1335 | } |
| 1336 | if (asint(this->getPathEffect()) | |
| 1337 | asint(this->getShader()) | |
| 1338 | asint(this->getXfermode()) | |
| 1339 | asint(this->getMaskFilter()) | |
| 1340 | asint(this->getColorFilter()) | |
| 1341 | asint(this->getRasterizer()) | |
| 1342 | asint(this->getLooper())) { |
| 1343 | flatFlags |= kHasEffects_FlatFlag; |
| 1344 | } |
| 1345 | |
| 1346 | SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize); |
| 1347 | uint32_t* ptr = buffer.reserve(kPODPaintSize); |
| 1348 | |
| 1349 | ptr = write_scalar(ptr, this->getTextSize()); |
| 1350 | ptr = write_scalar(ptr, this->getTextScaleX()); |
| 1351 | ptr = write_scalar(ptr, this->getTextSkewX()); |
| 1352 | ptr = write_scalar(ptr, this->getStrokeWidth()); |
| 1353 | ptr = write_scalar(ptr, this->getStrokeMiter()); |
| 1354 | *ptr++ = this->getColor(); |
| 1355 | *ptr++ = (this->getFlags() << 16) | (this->getTextAlign() << 8) | flatFlags; |
| 1356 | *ptr++ = pack_4(this->getStrokeCap(), this->getStrokeJoin(), |
| 1357 | this->getStyle(), this->getTextEncoding()); |
| 1358 | |
| 1359 | // now we're done with ptr and the (pre)reserved space. If we need to write |
| 1360 | // additional fields, use the buffer directly |
| 1361 | if (flatFlags & kHasTypeface_FlatFlag) { |
| 1362 | buffer.writeTypeface(this->getTypeface()); |
| 1363 | } |
| 1364 | if (flatFlags & kHasEffects_FlatFlag) { |
| 1365 | buffer.writeFlattenable(this->getPathEffect()); |
| 1366 | buffer.writeFlattenable(this->getShader()); |
| 1367 | buffer.writeFlattenable(this->getXfermode()); |
| 1368 | buffer.writeFlattenable(this->getMaskFilter()); |
| 1369 | buffer.writeFlattenable(this->getColorFilter()); |
| 1370 | buffer.writeFlattenable(this->getRasterizer()); |
| 1371 | buffer.writeFlattenable(this->getLooper()); |
| 1372 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1373 | } |
| 1374 | |
| 1375 | void SkPaint::unflatten(SkFlattenableReadBuffer& buffer) { |
reed@android.com | aefd2bc | 2009-03-30 21:02:14 +0000 | [diff] [blame] | 1376 | SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize); |
| 1377 | const void* podData = buffer.skip(kPODPaintSize); |
| 1378 | const uint32_t* pod = reinterpret_cast<const uint32_t*>(podData); |
| 1379 | |
| 1380 | // the order we read must match the order we wrote in flatten() |
| 1381 | this->setTextSize(read_scalar(pod)); |
| 1382 | this->setTextScaleX(read_scalar(pod)); |
| 1383 | this->setTextSkewX(read_scalar(pod)); |
| 1384 | this->setStrokeWidth(read_scalar(pod)); |
| 1385 | this->setStrokeMiter(read_scalar(pod)); |
| 1386 | this->setColor(*pod++); |
| 1387 | |
| 1388 | uint32_t tmp = *pod++; |
| 1389 | this->setFlags(tmp >> 16); |
| 1390 | this->setTextAlign(static_cast<Align>((tmp >> 8) & 0xFF)); |
| 1391 | uint8_t flatFlags = tmp & 0xFF; |
| 1392 | |
| 1393 | tmp = *pod++; |
| 1394 | this->setStrokeCap(static_cast<Cap>((tmp >> 24) & 0xFF)); |
| 1395 | this->setStrokeJoin(static_cast<Join>((tmp >> 16) & 0xFF)); |
| 1396 | this->setStyle(static_cast<Style>((tmp >> 8) & 0xFF)); |
| 1397 | this->setTextEncoding(static_cast<TextEncoding>((tmp >> 0) & 0xFF)); |
| 1398 | |
| 1399 | if (flatFlags & kHasTypeface_FlatFlag) { |
| 1400 | this->setTypeface(buffer.readTypeface()); |
| 1401 | } else { |
| 1402 | this->setTypeface(NULL); |
| 1403 | } |
| 1404 | |
| 1405 | if (flatFlags & kHasEffects_FlatFlag) { |
| 1406 | this->setPathEffect((SkPathEffect*) buffer.readFlattenable())->safeUnref(); |
| 1407 | this->setShader((SkShader*) buffer.readFlattenable())->safeUnref(); |
| 1408 | this->setXfermode((SkXfermode*) buffer.readFlattenable())->safeUnref(); |
| 1409 | this->setMaskFilter((SkMaskFilter*) buffer.readFlattenable())->safeUnref(); |
| 1410 | this->setColorFilter((SkColorFilter*) buffer.readFlattenable())->safeUnref(); |
| 1411 | this->setRasterizer((SkRasterizer*) buffer.readFlattenable())->safeUnref(); |
| 1412 | this->setLooper((SkDrawLooper*) buffer.readFlattenable())->safeUnref(); |
| 1413 | } else { |
| 1414 | this->setPathEffect(NULL); |
| 1415 | this->setShader(NULL); |
| 1416 | this->setXfermode(NULL); |
| 1417 | this->setMaskFilter(NULL); |
| 1418 | this->setColorFilter(NULL); |
| 1419 | this->setRasterizer(NULL); |
| 1420 | this->setLooper(NULL); |
| 1421 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1422 | } |
| 1423 | |
| 1424 | /////////////////////////////////////////////////////////////////////////////// |
| 1425 | |
| 1426 | SkShader* SkPaint::setShader(SkShader* shader) |
| 1427 | { |
| 1428 | SkRefCnt_SafeAssign(fShader, shader); |
| 1429 | return shader; |
| 1430 | } |
| 1431 | |
| 1432 | SkColorFilter* SkPaint::setColorFilter(SkColorFilter* filter) |
| 1433 | { |
| 1434 | SkRefCnt_SafeAssign(fColorFilter, filter); |
| 1435 | return filter; |
| 1436 | } |
| 1437 | |
| 1438 | SkXfermode* SkPaint::setXfermode(SkXfermode* mode) |
| 1439 | { |
| 1440 | SkRefCnt_SafeAssign(fXfermode, mode); |
| 1441 | return mode; |
| 1442 | } |
| 1443 | |
reed@android.com | 0baf193 | 2009-06-24 12:41:42 +0000 | [diff] [blame] | 1444 | SkXfermode* SkPaint::setXfermodeMode(SkXfermode::Mode mode) { |
reed@android.com | d66eef7 | 2009-06-24 12:29:16 +0000 | [diff] [blame] | 1445 | SkSafeUnref(fXfermode); |
| 1446 | fXfermode = SkXfermode::Create(mode); |
| 1447 | return fXfermode; |
| 1448 | } |
| 1449 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1450 | SkPathEffect* SkPaint::setPathEffect(SkPathEffect* effect) |
| 1451 | { |
| 1452 | SkRefCnt_SafeAssign(fPathEffect, effect); |
| 1453 | return effect; |
| 1454 | } |
| 1455 | |
| 1456 | SkMaskFilter* SkPaint::setMaskFilter(SkMaskFilter* filter) |
| 1457 | { |
| 1458 | SkRefCnt_SafeAssign(fMaskFilter, filter); |
| 1459 | return filter; |
| 1460 | } |
| 1461 | |
| 1462 | //////////////////////////////////////////////////////////////////////////////////////// |
| 1463 | |
| 1464 | bool SkPaint::getFillPath(const SkPath& src, SkPath* dst) const |
| 1465 | { |
| 1466 | SkPath effectPath, strokePath; |
| 1467 | const SkPath* path = &src; |
| 1468 | |
| 1469 | SkScalar width = this->getStrokeWidth(); |
| 1470 | |
| 1471 | switch (this->getStyle()) { |
| 1472 | case SkPaint::kFill_Style: |
| 1473 | width = -1; // mark it as no-stroke |
| 1474 | break; |
| 1475 | case SkPaint::kStrokeAndFill_Style: |
| 1476 | if (width == 0) |
| 1477 | width = -1; // mark it as no-stroke |
| 1478 | break; |
| 1479 | case SkPaint::kStroke_Style: |
| 1480 | break; |
| 1481 | default: |
| 1482 | SkASSERT(!"unknown paint style"); |
| 1483 | } |
| 1484 | |
| 1485 | if (this->getPathEffect()) |
| 1486 | { |
| 1487 | // lie to the pathEffect if our style is strokeandfill, so that it treats us as just fill |
| 1488 | if (this->getStyle() == SkPaint::kStrokeAndFill_Style) |
| 1489 | width = -1; // mark it as no-stroke |
| 1490 | |
| 1491 | if (this->getPathEffect()->filterPath(&effectPath, src, &width)) |
| 1492 | path = &effectPath; |
| 1493 | |
| 1494 | // restore the width if we earlier had to lie, and if we're still set to no-stroke |
| 1495 | // note: if we're now stroke (width >= 0), then the pathEffect asked for that change |
| 1496 | // and we want to respect that (i.e. don't overwrite their setting for width) |
| 1497 | if (this->getStyle() == SkPaint::kStrokeAndFill_Style && width < 0) |
| 1498 | { |
| 1499 | width = this->getStrokeWidth(); |
| 1500 | if (width == 0) |
| 1501 | width = -1; |
| 1502 | } |
| 1503 | } |
| 1504 | |
| 1505 | if (width > 0 && !path->isEmpty()) |
| 1506 | { |
| 1507 | SkStroke stroker(*this, width); |
| 1508 | stroker.strokePath(*path, &strokePath); |
| 1509 | path = &strokePath; |
| 1510 | } |
| 1511 | |
| 1512 | if (path == &src) |
| 1513 | *dst = src; |
| 1514 | else |
| 1515 | { |
| 1516 | SkASSERT(path == &effectPath || path == &strokePath); |
| 1517 | dst->swap(*(SkPath*)path); |
| 1518 | } |
| 1519 | |
| 1520 | return width != 0; // return true if we're filled, or false if we're hairline (width == 0) |
| 1521 | } |
| 1522 | |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 1523 | const SkRect& SkPaint::computeStrokeFastBounds(const SkRect& src, |
| 1524 | SkRect* storage) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1525 | SkASSERT(storage); |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 1526 | SkASSERT(this->getStyle() != SkPaint::kFill_Style); |
| 1527 | |
| 1528 | // since we're stroked, outset the rect by the radius (and join type) |
| 1529 | SkScalar radius = SkScalarHalf(this->getStrokeWidth()); |
| 1530 | if (0 == radius) { // hairline |
| 1531 | radius = SK_Scalar1; |
| 1532 | } else if (this->getStrokeJoin() == SkPaint::kMiter_Join) { |
| 1533 | SkScalar scale = this->getStrokeMiter(); |
| 1534 | if (scale > SK_Scalar1) { |
| 1535 | radius = SkScalarMul(radius, scale); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1536 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1537 | } |
reed@android.com | d252db0 | 2009-04-01 18:31:44 +0000 | [diff] [blame] | 1538 | storage->set(src.fLeft - radius, src.fTop - radius, |
| 1539 | src.fRight + radius, src.fBottom + radius); |
| 1540 | return *storage; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1541 | } |
| 1542 | |
| 1543 | //////////////////////////////////////////////////////////////////////////////////////// |
| 1544 | |
| 1545 | static bool has_thick_frame(const SkPaint& paint) |
| 1546 | { |
| 1547 | return paint.getStrokeWidth() > 0 && paint.getStyle() != SkPaint::kFill_Style; |
| 1548 | } |
| 1549 | |
| 1550 | SkTextToPathIter::SkTextToPathIter( const char text[], size_t length, |
| 1551 | const SkPaint& paint, |
| 1552 | bool applyStrokeAndPathEffects, |
| 1553 | bool forceLinearTextOn) |
| 1554 | : fPaint(paint) /* make a copy of the paint */ |
| 1555 | { |
| 1556 | fGlyphCacheProc = paint.getMeasureCacheProc(SkPaint::kForward_TextBufferDirection, |
| 1557 | true); |
| 1558 | |
| 1559 | if (forceLinearTextOn) |
| 1560 | fPaint.setLinearText(true); |
| 1561 | fPaint.setMaskFilter(NULL); // don't want this affecting our path-cache lookup |
| 1562 | |
| 1563 | if (fPaint.getPathEffect() == NULL && !has_thick_frame(fPaint)) |
| 1564 | applyStrokeAndPathEffects = false; |
| 1565 | |
| 1566 | // can't use our canonical size if we need to apply patheffects/strokes |
| 1567 | if (fPaint.isLinearText() && !applyStrokeAndPathEffects) |
| 1568 | { |
| 1569 | fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths)); |
| 1570 | fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths; |
| 1571 | } |
| 1572 | else |
| 1573 | fScale = SK_Scalar1; |
| 1574 | |
| 1575 | if (!applyStrokeAndPathEffects) |
| 1576 | { |
| 1577 | fPaint.setStyle(SkPaint::kFill_Style); |
| 1578 | fPaint.setPathEffect(NULL); |
| 1579 | } |
| 1580 | |
| 1581 | fCache = fPaint.detachCache(NULL); |
| 1582 | |
| 1583 | SkPaint::Style style = SkPaint::kFill_Style; |
| 1584 | SkPathEffect* pe = NULL; |
| 1585 | |
| 1586 | if (!applyStrokeAndPathEffects) |
| 1587 | { |
| 1588 | style = paint.getStyle(); // restore |
| 1589 | pe = paint.getPathEffect(); // restore |
| 1590 | } |
| 1591 | fPaint.setStyle(style); |
| 1592 | fPaint.setPathEffect(pe); |
| 1593 | fPaint.setMaskFilter(paint.getMaskFilter()); // restore |
| 1594 | |
| 1595 | // now compute fXOffset if needed |
| 1596 | |
| 1597 | SkScalar xOffset = 0; |
| 1598 | if (paint.getTextAlign() != SkPaint::kLeft_Align) // need to measure first |
| 1599 | { |
| 1600 | int count; |
| 1601 | SkScalar width = SkScalarMul(fPaint.measure_text(fCache, text, length, &count, NULL), fScale); |
| 1602 | if (paint.getTextAlign() == SkPaint::kCenter_Align) |
| 1603 | width = SkScalarHalf(width); |
| 1604 | xOffset = -width; |
| 1605 | } |
| 1606 | fXPos = xOffset; |
| 1607 | fPrevAdvance = 0; |
| 1608 | |
| 1609 | fText = text; |
| 1610 | fStop = text + length; |
| 1611 | } |
| 1612 | |
| 1613 | SkTextToPathIter::~SkTextToPathIter() |
| 1614 | { |
| 1615 | SkGlyphCache::AttachCache(fCache); |
| 1616 | } |
| 1617 | |
| 1618 | const SkPath* SkTextToPathIter::next(SkScalar* xpos) |
| 1619 | { |
| 1620 | while (fText < fStop) |
| 1621 | { |
| 1622 | const SkGlyph& glyph = fGlyphCacheProc(fCache, &fText); |
| 1623 | |
| 1624 | fXPos += SkScalarMul(SkFixedToScalar(fPrevAdvance + fAutoKern.adjust(glyph)), fScale); |
| 1625 | fPrevAdvance = glyph.fAdvanceX; // + fPaint.getTextTracking(); |
| 1626 | |
| 1627 | if (glyph.fWidth) |
| 1628 | { |
| 1629 | if (xpos) |
| 1630 | *xpos = fXPos; |
| 1631 | return fCache->findPath(glyph); |
| 1632 | } |
| 1633 | } |
| 1634 | return NULL; |
| 1635 | } |