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| 1 /* libs/graphics/ports/SkFontHost_FreeType.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 "SkScalerContext.h" | |
| 19 #include "SkBitmap.h" | |
| 20 #include "SkCanvas.h" | |
| 21 #include "SkDescriptor.h" | |
| 22 #include "SkFDot6.h" | |
| 23 #include "SkFontHost.h" | |
| 24 #include "SkMask.h" | |
| 25 #include "SkStream.h" | |
| 26 #include "SkString.h" | |
| 27 #include "SkThread.h" | |
| 28 #include "SkTemplates.h" | |
| 29 | |
| 30 #include <ft2build.h> | |
| 31 #include FT_FREETYPE_H | |
| 32 #include FT_OUTLINE_H | |
| 33 #include FT_SIZES_H | |
| 34 #include FT_TRUETYPE_TABLES_H | |
| 35 #ifdef FT_ADVANCES_H | |
| 36 #include FT_ADVANCES_H | |
| 37 #endif | |
| 38 | |
| 39 #if 0 | |
| 40 // Also include the files by name for build tools which require this. | |
| 41 #include <freetype/freetype.h> | |
| 42 #include <freetype/ftoutln.h> | |
| 43 #include <freetype/ftsizes.h> | |
| 44 #include <freetype/tttables.h> | |
| 45 #include <freetype/ftadvanc.h> | |
| 46 #endif | |
| 47 | |
| 48 //#define ENABLE_GLYPH_SPEW // for tracing calls | |
| 49 //#define DUMP_STRIKE_CREATION | |
| 50 | |
| 51 #ifdef SK_DEBUG | |
| 52 #define SkASSERT_CONTINUE(pred)
\ | |
| 53 do {
\ | |
| 54 if (!(pred))
\ | |
| 55 SkDebugf("file %s:%d: assert failed '" #pred "'\n", __FILE__, __
LINE__); \ | |
| 56 } while (false) | |
| 57 #else | |
| 58 #define SkASSERT_CONTINUE(pred) | |
| 59 #endif | |
| 60 | |
| 61 ////////////////////////////////////////////////////////////////////////// | |
| 62 | |
| 63 struct SkFaceRec; | |
| 64 | |
| 65 static SkMutex gFTMutex; | |
| 66 static int gFTCount; | |
| 67 static FT_Library gFTLibrary; | |
| 68 static SkFaceRec* gFaceRecHead; | |
| 69 | |
| 70 ///////////////////////////////////////////////////////////////////////// | |
| 71 | |
| 72 class SkScalerContext_FreeType : public SkScalerContext { | |
| 73 public: | |
| 74 SkScalerContext_FreeType(const SkDescriptor* desc); | |
| 75 virtual ~SkScalerContext_FreeType(); | |
| 76 | |
| 77 bool success() const { | |
| 78 return fFaceRec != NULL && fFTSize != NULL; | |
| 79 } | |
| 80 | |
| 81 protected: | |
| 82 virtual unsigned generateGlyphCount() const; | |
| 83 virtual uint16_t generateCharToGlyph(SkUnichar uni); | |
| 84 virtual void generateAdvance(SkGlyph* glyph); | |
| 85 virtual void generateMetrics(SkGlyph* glyph); | |
| 86 virtual void generateImage(const SkGlyph& glyph); | |
| 87 virtual void generatePath(const SkGlyph& glyph, SkPath* path); | |
| 88 virtual void generateFontMetrics(SkPaint::FontMetrics* mx, | |
| 89 SkPaint::FontMetrics* my); | |
| 90 | |
| 91 private: | |
| 92 SkFaceRec* fFaceRec; | |
| 93 FT_Face fFace; // reference to shared face in gFaceRecHead | |
| 94 FT_Size fFTSize; // our own copy | |
| 95 SkFixed fScaleX, fScaleY; | |
| 96 FT_Matrix fMatrix22; | |
| 97 uint32_t fLoadGlyphFlags; | |
| 98 | |
| 99 FT_Error setupSize(); | |
| 100 }; | |
| 101 | |
| 102 /////////////////////////////////////////////////////////////////////////// | |
| 103 /////////////////////////////////////////////////////////////////////////// | |
| 104 | |
| 105 #include "SkStream.h" | |
| 106 | |
| 107 struct SkFaceRec { | |
| 108 SkFaceRec* fNext; | |
| 109 FT_Face fFace; | |
| 110 FT_StreamRec fFTStream; | |
| 111 SkStream* fSkStream; | |
| 112 uint32_t fRefCnt; | |
| 113 uint32_t fFontID; | |
| 114 | |
| 115 // assumes ownership of the stream, will call unref() when its done | |
| 116 SkFaceRec(SkStream* strm, uint32_t fontID); | |
| 117 ~SkFaceRec() { | |
| 118 fSkStream->unref(); | |
| 119 } | |
| 120 }; | |
| 121 | |
| 122 extern "C" { | |
| 123 static unsigned long sk_stream_read(FT_Stream stream, | |
| 124 unsigned long offset, | |
| 125 unsigned char* buffer, | |
| 126 unsigned long count ) { | |
| 127 SkStream* str = (SkStream*)stream->descriptor.pointer; | |
| 128 | |
| 129 if (count) { | |
| 130 if (!str->rewind()) { | |
| 131 return 0; | |
| 132 } else { | |
| 133 unsigned long ret; | |
| 134 if (offset) { | |
| 135 ret = str->read(NULL, offset); | |
| 136 if (ret != offset) { | |
| 137 return 0; | |
| 138 } | |
| 139 } | |
| 140 ret = str->read(buffer, count); | |
| 141 if (ret != count) { | |
| 142 return 0; | |
| 143 } | |
| 144 count = ret; | |
| 145 } | |
| 146 } | |
| 147 return count; | |
| 148 } | |
| 149 | |
| 150 static void sk_stream_close( FT_Stream stream) {} | |
| 151 } | |
| 152 | |
| 153 SkFaceRec::SkFaceRec(SkStream* strm, uint32_t fontID) | |
| 154 : fSkStream(strm), fFontID(fontID) { | |
| 155 // SkDEBUGF(("SkFaceRec: opening %s (%p)\n", key.c_str(), strm)); | |
| 156 | |
| 157 bzero(&fFTStream, sizeof(fFTStream)); | |
| 158 fFTStream.size = fSkStream->getLength(); | |
| 159 fFTStream.descriptor.pointer = fSkStream; | |
| 160 fFTStream.read = sk_stream_read; | |
| 161 fFTStream.close = sk_stream_close; | |
| 162 } | |
| 163 | |
| 164 // Will return 0 on failure | |
| 165 static SkFaceRec* ref_ft_face(uint32_t fontID) { | |
| 166 SkFaceRec* rec = gFaceRecHead; | |
| 167 while (rec) { | |
| 168 if (rec->fFontID == fontID) { | |
| 169 SkASSERT(rec->fFace); | |
| 170 rec->fRefCnt += 1; | |
| 171 return rec; | |
| 172 } | |
| 173 rec = rec->fNext; | |
| 174 } | |
| 175 | |
| 176 SkStream* strm = SkFontHost::OpenStream(fontID); | |
| 177 if (NULL == strm) { | |
| 178 SkDEBUGF(("SkFontHost::OpenStream failed opening %x\n", fontID)); | |
| 179 return 0; | |
| 180 } | |
| 181 | |
| 182 // this passes ownership of strm to the rec | |
| 183 rec = SkNEW_ARGS(SkFaceRec, (strm, fontID)); | |
| 184 | |
| 185 FT_Open_Args args; | |
| 186 memset(&args, 0, sizeof(args)); | |
| 187 const void* memoryBase = strm->getMemoryBase(); | |
| 188 | |
| 189 if (NULL != memoryBase) { | |
| 190 //printf("mmap(%s)\n", keyString.c_str()); | |
| 191 args.flags = FT_OPEN_MEMORY; | |
| 192 args.memory_base = (const FT_Byte*)memoryBase; | |
| 193 args.memory_size = strm->getLength(); | |
| 194 } else { | |
| 195 //printf("fopen(%s)\n", keyString.c_str()); | |
| 196 args.flags = FT_OPEN_STREAM; | |
| 197 args.stream = &rec->fFTStream; | |
| 198 } | |
| 199 | |
| 200 FT_Error err = FT_Open_Face(gFTLibrary, &args, 0, &rec->fFace); | |
| 201 | |
| 202 if (err) { // bad filename, try the default font | |
| 203 fprintf(stderr, "ERROR: unable to open font '%x'\n", fontID); | |
| 204 SkDELETE(rec); | |
| 205 return 0; | |
| 206 } else { | |
| 207 SkASSERT(rec->fFace); | |
| 208 //fprintf(stderr, "Opened font '%s'\n", filename.c_str()); | |
| 209 rec->fNext = gFaceRecHead; | |
| 210 gFaceRecHead = rec; | |
| 211 rec->fRefCnt = 1; | |
| 212 return rec; | |
| 213 } | |
| 214 } | |
| 215 | |
| 216 static void unref_ft_face(FT_Face face) { | |
| 217 SkFaceRec* rec = gFaceRecHead; | |
| 218 SkFaceRec* prev = NULL; | |
| 219 while (rec) { | |
| 220 SkFaceRec* next = rec->fNext; | |
| 221 if (rec->fFace == face) { | |
| 222 if (--rec->fRefCnt == 0) { | |
| 223 if (prev) { | |
| 224 prev->fNext = next; | |
| 225 } else { | |
| 226 gFaceRecHead = next; | |
| 227 } | |
| 228 FT_Done_Face(face); | |
| 229 SkDELETE(rec); | |
| 230 } | |
| 231 return; | |
| 232 } | |
| 233 prev = rec; | |
| 234 rec = next; | |
| 235 } | |
| 236 SkASSERT("shouldn't get here, face not in list"); | |
| 237 } | |
| 238 | |
| 239 /////////////////////////////////////////////////////////////////////////// | |
| 240 | |
| 241 SkScalerContext_FreeType::SkScalerContext_FreeType(const SkDescriptor* desc) | |
| 242 : SkScalerContext(desc) { | |
| 243 SkAutoMutexAcquire ac(gFTMutex); | |
| 244 | |
| 245 FT_Error err; | |
| 246 | |
| 247 if (gFTCount == 0) { | |
| 248 err = FT_Init_FreeType(&gFTLibrary); | |
| 249 // SkDEBUGF(("FT_Init_FreeType returned %d\n", err)); | |
| 250 SkASSERT(err == 0); | |
| 251 } | |
| 252 ++gFTCount; | |
| 253 | |
| 254 // load the font file | |
| 255 fFTSize = NULL; | |
| 256 fFace = NULL; | |
| 257 fFaceRec = ref_ft_face(fRec.fFontID); | |
| 258 if (NULL == fFaceRec) { | |
| 259 return; | |
| 260 } | |
| 261 fFace = fFaceRec->fFace; | |
| 262 | |
| 263 // compute our factors from the record | |
| 264 | |
| 265 SkMatrix m; | |
| 266 | |
| 267 fRec.getSingleMatrix(&m); | |
| 268 | |
| 269 #ifdef DUMP_STRIKE_CREATION | |
| 270 SkString keyString; | |
| 271 SkFontHost::GetDescriptorKeyString(desc, &keyString); | |
| 272 printf("========== strike [%g %g %g] [%g %g %g %g] hints %d format %d %s\n",
SkScalarToFloat(fRec.fTextSize), | |
| 273 SkScalarToFloat(fRec.fPreScaleX), SkScalarToFloat(fRec.fPreSkewX), | |
| 274 SkScalarToFloat(fRec.fPost2x2[0][0]), SkScalarToFloat(fRec.fPost2x2[0
][1]), | |
| 275 SkScalarToFloat(fRec.fPost2x2[1][0]), SkScalarToFloat(fRec.fPost2x2[1
][1]), | |
| 276 fRec.fHints, fRec.fMaskFormat, keyString.c_str()); | |
| 277 #endif | |
| 278 | |
| 279 // now compute our scale factors | |
| 280 SkScalar sx = m.getScaleX(); | |
| 281 SkScalar sy = m.getScaleY(); | |
| 282 | |
| 283 if (m.getSkewX() || m.getSkewY() || sx < 0 || sy < 0) { | |
| 284 // sort of give up on hinting | |
| 285 sx = SkMaxScalar(SkScalarAbs(sx), SkScalarAbs(m.getSkewX())); | |
| 286 sy = SkMaxScalar(SkScalarAbs(m.getSkewY()), SkScalarAbs(sy)); | |
| 287 sx = sy = SkScalarAve(sx, sy); | |
| 288 | |
| 289 SkScalar inv = SkScalarInvert(sx); | |
| 290 | |
| 291 // flip the skew elements to go from our Y-down system to FreeType's | |
| 292 fMatrix22.xx = SkScalarToFixed(SkScalarMul(m.getScaleX(), inv)); | |
| 293 fMatrix22.xy = -SkScalarToFixed(SkScalarMul(m.getSkewX(), inv)); | |
| 294 fMatrix22.yx = -SkScalarToFixed(SkScalarMul(m.getSkewY(), inv)); | |
| 295 fMatrix22.yy = SkScalarToFixed(SkScalarMul(m.getScaleY(), inv)); | |
| 296 } else { | |
| 297 fMatrix22.xx = fMatrix22.yy = SK_Fixed1; | |
| 298 fMatrix22.xy = fMatrix22.yx = 0; | |
| 299 } | |
| 300 | |
| 301 fScaleX = SkScalarToFixed(sx); | |
| 302 fScaleY = SkScalarToFixed(sy); | |
| 303 | |
| 304 // compute the flags we send to Load_Glyph | |
| 305 { | |
| 306 uint32_t flags = FT_LOAD_DEFAULT; | |
| 307 uint32_t render_flags = FT_LOAD_TARGET_NORMAL; | |
| 308 | |
| 309 // we force autohinting at the moment | |
| 310 | |
| 311 switch (fRec.fHints) { | |
| 312 case kNo_Hints: | |
| 313 flags |= FT_LOAD_NO_HINTING; | |
| 314 break; | |
| 315 case kSubpixel_Hints: | |
| 316 flags |= FT_LOAD_FORCE_AUTOHINT; | |
| 317 render_flags = FT_LOAD_TARGET_LIGHT; | |
| 318 break; | |
| 319 case kNormal_Hints: | |
| 320 #ifdef ANDROID | |
| 321 // The following line disables the font's hinting tables. For | |
| 322 // Chromium we want font hinting on so that we can generate | |
| 323 // baselines that look at little like Firefox. It's expected that | |
| 324 // Mike Reed will rework this code sometime soon so we don't wish | |
| 325 // to make more extensive changes. | |
| 326 flags |= FT_LOAD_FORCE_AUTOHINT; | |
| 327 /* Switch to light hinting (vertical only) to address some chars | |
| 328 that behaved poorly with NORMAL. In the future we could consider | |
| 329 making this choice exposed at runtime to the caller. | |
| 330 */ | |
| 331 render_flags = FT_LOAD_TARGET_LIGHT; | |
| 332 #endif | |
| 333 break; | |
| 334 } | |
| 335 | |
| 336 if (SkMask::kBW_Format == fRec.fMaskFormat) | |
| 337 render_flags = FT_LOAD_TARGET_MONO; | |
| 338 else if (SkMask::kLCD_Format == fRec.fMaskFormat) | |
| 339 render_flags = FT_LOAD_TARGET_LCD; | |
| 340 | |
| 341 fLoadGlyphFlags = flags | render_flags; | |
| 342 } | |
| 343 | |
| 344 // now create the FT_Size | |
| 345 | |
| 346 { | |
| 347 FT_Error err; | |
| 348 | |
| 349 err = FT_New_Size(fFace, &fFTSize); | |
| 350 if (err != 0) { | |
| 351 SkDEBUGF(("SkScalerContext_FreeType::FT_New_Size(%x): FT_Set_Char_Si
ze(0x%x, 0x%x) returned 0x%x\n", | |
| 352 fFaceRec->fFontID, fScaleX, fScaleY, err)); | |
| 353 fFace = NULL; | |
| 354 return; | |
| 355 } | |
| 356 | |
| 357 err = FT_Activate_Size(fFTSize); | |
| 358 if (err != 0) { | |
| 359 SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x
) returned 0x%x\n", | |
| 360 fFaceRec->fFontID, fScaleX, fScaleY, err)); | |
| 361 fFTSize = NULL; | |
| 362 } | |
| 363 | |
| 364 err = FT_Set_Char_Size( fFace, | |
| 365 SkFixedToFDot6(fScaleX), SkFixedToFDot6(fScaleY)
, | |
| 366 72, 72); | |
| 367 if (err != 0) { | |
| 368 SkDEBUGF(("SkScalerContext_FreeType::FT_Set_Char_Size(%x, 0x%x, 0x%x
) returned 0x%x\n", | |
| 369 fFaceRec->fFontID, fScaleX, fScaleY, err)); | |
| 370 fFace = NULL; | |
| 371 return; | |
| 372 } | |
| 373 | |
| 374 FT_Set_Transform( fFace, &fMatrix22, NULL); | |
| 375 } | |
| 376 } | |
| 377 | |
| 378 SkScalerContext_FreeType::~SkScalerContext_FreeType() { | |
| 379 if (fFTSize != NULL) { | |
| 380 FT_Done_Size(fFTSize); | |
| 381 } | |
| 382 | |
| 383 SkAutoMutexAcquire ac(gFTMutex); | |
| 384 | |
| 385 if (fFace != NULL) { | |
| 386 unref_ft_face(fFace); | |
| 387 } | |
| 388 if (--gFTCount == 0) { | |
| 389 // SkDEBUGF(("FT_Done_FreeType\n")); | |
| 390 FT_Done_FreeType(gFTLibrary); | |
| 391 SkDEBUGCODE(gFTLibrary = NULL;) | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 /* We call this before each use of the fFace, since we may be sharing | |
| 396 this face with other context (at different sizes). | |
| 397 */ | |
| 398 FT_Error SkScalerContext_FreeType::setupSize() { | |
| 399 if (SkFontHost::ResolveTypeface(fRec.fFontID) == NULL) { | |
| 400 return (FT_Error)-1; | |
| 401 } | |
| 402 | |
| 403 FT_Error err = FT_Activate_Size(fFTSize); | |
| 404 | |
| 405 if (err != 0) { | |
| 406 SkDEBUGF(("SkScalerContext_FreeType::FT_Activate_Size(%x, 0x%x, 0x%x) re
turned 0x%x\n", | |
| 407 fFaceRec->fFontID, fScaleX, fScaleY, err)); | |
| 408 fFTSize = NULL; | |
| 409 } else { | |
| 410 // seems we need to reset this every time (not sure why, but without it | |
| 411 // I get random italics from some other fFTSize) | |
| 412 FT_Set_Transform( fFace, &fMatrix22, NULL); | |
| 413 } | |
| 414 return err; | |
| 415 } | |
| 416 | |
| 417 unsigned SkScalerContext_FreeType::generateGlyphCount() const { | |
| 418 return fFace->num_glyphs; | |
| 419 } | |
| 420 | |
| 421 uint16_t SkScalerContext_FreeType::generateCharToGlyph(SkUnichar uni) { | |
| 422 return SkToU16(FT_Get_Char_Index( fFace, uni )); | |
| 423 } | |
| 424 | |
| 425 static FT_Pixel_Mode compute_pixel_mode(SkMask::Format format) { | |
| 426 switch (format) { | |
| 427 case SkMask::kBW_Format: | |
| 428 return FT_PIXEL_MODE_MONO; | |
| 429 case SkMask::kLCD_Format: | |
| 430 return FT_PIXEL_MODE_LCD; | |
| 431 case SkMask::kA8_Format: | |
| 432 default: | |
| 433 return FT_PIXEL_MODE_GRAY; | |
| 434 } | |
| 435 } | |
| 436 | |
| 437 void SkScalerContext_FreeType::generateAdvance(SkGlyph* glyph) { | |
| 438 #ifdef FT_ADVANCES_H | |
| 439 /* unhinted and light hinted text have linearly scaled advances | |
| 440 * which are very cheap to compute with some font formats... | |
| 441 */ | |
| 442 { | |
| 443 SkAutoMutexAcquire ac(gFTMutex); | |
| 444 | |
| 445 if (this->setupSize()) { | |
| 446 glyph->zeroMetrics(); | |
| 447 return; | |
| 448 } | |
| 449 | |
| 450 FT_Error error; | |
| 451 FT_Fixed advance; | |
| 452 | |
| 453 error = FT_Get_Advance( fFace, glyph->getGlyphID(fBaseGlyphCount), | |
| 454 fLoadGlyphFlags | FT_ADVANCE_FLAG_FAST_ONLY, | |
| 455 &advance ); | |
| 456 if (0 == error) { | |
| 457 glyph->fRsbDelta = 0; | |
| 458 glyph->fLsbDelta = 0; | |
| 459 glyph->fAdvanceX = advance; // advance *2/3; //DEBUG | |
| 460 glyph->fAdvanceY = 0; | |
| 461 return; | |
| 462 } | |
| 463 } | |
| 464 #endif /* FT_ADVANCES_H */ | |
| 465 /* otherwise, we need to load/hint the glyph, which is slower */ | |
| 466 this->generateMetrics(glyph); | |
| 467 return; | |
| 468 } | |
| 469 | |
| 470 void SkScalerContext_FreeType::generateMetrics(SkGlyph* glyph) { | |
| 471 SkAutoMutexAcquire ac(gFTMutex); | |
| 472 | |
| 473 glyph->fRsbDelta = 0; | |
| 474 glyph->fLsbDelta = 0; | |
| 475 | |
| 476 FT_Error err; | |
| 477 | |
| 478 if (this->setupSize()) { | |
| 479 goto ERROR; | |
| 480 } | |
| 481 | |
| 482 err = FT_Load_Glyph( fFace, glyph->getGlyphID(fBaseGlyphCount), fLoadGlyphFl
ags ); | |
| 483 if (err != 0) { | |
| 484 SkDEBUGF(("SkScalerContext_FreeType::generateMetrics(%x): FT_Load_Glyph(
glyph:%d flags:%d) returned 0x%x\n", | |
| 485 fFaceRec->fFontID, glyph->getGlyphID(fBaseGlyphCount), fLoad
GlyphFlags, err)); | |
| 486 ERROR: | |
| 487 glyph->zeroMetrics(); | |
| 488 return; | |
| 489 } | |
| 490 | |
| 491 switch ( fFace->glyph->format ) { | |
| 492 case FT_GLYPH_FORMAT_OUTLINE: | |
| 493 FT_BBox bbox; | |
| 494 | |
| 495 FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); | |
| 496 | |
| 497 if (kSubpixel_Hints == fRec.fHints) { | |
| 498 int dx = glyph->getSubXFixed() >> 10; | |
| 499 int dy = glyph->getSubYFixed() >> 10; | |
| 500 // negate dy since freetype-y-goes-up and skia-y-goes-down | |
| 501 bbox.xMin += dx; | |
| 502 bbox.yMin -= dy; | |
| 503 bbox.xMax += dx; | |
| 504 bbox.yMax -= dy; | |
| 505 } | |
| 506 | |
| 507 bbox.xMin &= ~63; | |
| 508 bbox.yMin &= ~63; | |
| 509 bbox.xMax = (bbox.xMax + 63) & ~63; | |
| 510 bbox.yMax = (bbox.yMax + 63) & ~63; | |
| 511 | |
| 512 glyph->fWidth = SkToU16((bbox.xMax - bbox.xMin) >> 6); | |
| 513 glyph->fHeight = SkToU16((bbox.yMax - bbox.yMin) >> 6); | |
| 514 glyph->fTop = -SkToS16(bbox.yMax >> 6); | |
| 515 glyph->fLeft = SkToS16(bbox.xMin >> 6); | |
| 516 break; | |
| 517 | |
| 518 case FT_GLYPH_FORMAT_BITMAP: | |
| 519 glyph->fWidth = SkToU16(fFace->glyph->bitmap.width); | |
| 520 glyph->fHeight = SkToU16(fFace->glyph->bitmap.rows); | |
| 521 glyph->fTop = -SkToS16(fFace->glyph->bitmap_top); | |
| 522 glyph->fLeft = SkToS16(fFace->glyph->bitmap_left); | |
| 523 break; | |
| 524 | |
| 525 default: | |
| 526 SkASSERT(!"unknown glyph format"); | |
| 527 goto ERROR; | |
| 528 } | |
| 529 | |
| 530 if (kNormal_Hints == fRec.fHints) { | |
| 531 glyph->fAdvanceX = SkFDot6ToFixed(fFace->glyph->advance.x); | |
| 532 glyph->fAdvanceY = -SkFDot6ToFixed(fFace->glyph->advance.y); | |
| 533 if (fRec.fFlags & kDevKernText_Flag) { | |
| 534 glyph->fRsbDelta = SkToS8(fFace->glyph->rsb_delta); | |
| 535 glyph->fLsbDelta = SkToS8(fFace->glyph->lsb_delta); | |
| 536 } | |
| 537 } else { | |
| 538 glyph->fAdvanceX = SkFixedMul(fMatrix22.xx, fFace->glyph->linearHoriAdva
nce); | |
| 539 glyph->fAdvanceY = -SkFixedMul(fMatrix22.yx, fFace->glyph->linearHoriAdv
ance); | |
| 540 } | |
| 541 | |
| 542 #ifdef ENABLE_GLYPH_SPEW | |
| 543 SkDEBUGF(("FT_Set_Char_Size(this:%p sx:%x sy:%x ", this, fScaleX, fScaleY)); | |
| 544 SkDEBUGF(("Metrics(glyph:%d flags:0x%x) w:%d\n", glyph->getGlyphID(fBaseGlyp
hCount), fLoadGlyphFlags, glyph->fWidth)); | |
| 545 #endif | |
| 546 } | |
| 547 | |
| 548 void SkScalerContext_FreeType::generateImage(const SkGlyph& glyph) { | |
| 549 SkAutoMutexAcquire ac(gFTMutex); | |
| 550 | |
| 551 FT_Error err; | |
| 552 | |
| 553 if (this->setupSize()) { | |
| 554 goto ERROR; | |
| 555 } | |
| 556 | |
| 557 err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), fLoadGlyphFla
gs); | |
| 558 if (err != 0) { | |
| 559 SkDEBUGF(("SkScalerContext_FreeType::generateImage: FT_Load_Glyph(glyph:
%d width:%d height:%d rb:%d flags:%d) returned 0x%x\n", | |
| 560 glyph.getGlyphID(fBaseGlyphCount), glyph.fWidth, glyph.fHeig
ht, glyph.rowBytes(), fLoadGlyphFlags, err)); | |
| 561 ERROR: | |
| 562 memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); | |
| 563 return; | |
| 564 } | |
| 565 | |
| 566 switch ( fFace->glyph->format ) { | |
| 567 case FT_GLYPH_FORMAT_OUTLINE: { | |
| 568 FT_Outline* outline = &fFace->glyph->outline; | |
| 569 FT_BBox bbox; | |
| 570 FT_Bitmap target; | |
| 571 | |
| 572 int dx = 0, dy = 0; | |
| 573 if (kSubpixel_Hints == fRec.fHints) { | |
| 574 dx = glyph.getSubXFixed() >> 10; | |
| 575 dy = glyph.getSubYFixed() >> 10; | |
| 576 // negate dy since freetype-y-goes-up and skia-y-goes-down | |
| 577 dy = -dy; | |
| 578 } | |
| 579 FT_Outline_Get_CBox(outline, &bbox); | |
| 580 /* | |
| 581 what we really want to do for subpixel is | |
| 582 offset(dx, dy) | |
| 583 compute_bounds | |
| 584 offset(bbox & !63) | |
| 585 but that is two calls to offset, so we do the following, which | |
| 586 achieves the same thing with only one offset call. | |
| 587 */ | |
| 588 FT_Outline_Translate(outline, dx - ((bbox.xMin + dx) & ~63), | |
| 589 dy - ((bbox.yMin + dy) & ~63)); | |
| 590 | |
| 591 target.width = glyph.fWidth; | |
| 592 target.rows = glyph.fHeight; | |
| 593 target.pitch = glyph.rowBytes(); | |
| 594 target.buffer = reinterpret_cast<uint8_t*>(glyph.fImage); | |
| 595 target.pixel_mode = compute_pixel_mode( | |
| 596 (SkMask::Format)fRec.fMaskFormat); | |
| 597 target.num_grays = 256; | |
| 598 | |
| 599 memset(glyph.fImage, 0, glyph.rowBytes() * glyph.fHeight); | |
| 600 FT_Outline_Get_Bitmap(gFTLibrary, outline, &target); | |
| 601 } break; | |
| 602 | |
| 603 case FT_GLYPH_FORMAT_BITMAP: { | |
| 604 SkASSERT_CONTINUE(glyph.fWidth == fFace->glyph->bitmap.width); | |
| 605 SkASSERT_CONTINUE(glyph.fHeight == fFace->glyph->bitmap.rows); | |
| 606 SkASSERT_CONTINUE(glyph.fTop == -fFace->glyph->bitmap_top); | |
| 607 SkASSERT_CONTINUE(glyph.fLeft == fFace->glyph->bitmap_left); | |
| 608 | |
| 609 const uint8_t* src = (const uint8_t*)fFace->glyph->bitmap.buffer; | |
| 610 uint8_t* dst = (uint8_t*)glyph.fImage; | |
| 611 | |
| 612 if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY) { | |
| 613 unsigned srcRowBytes = fFace->glyph->bitmap.pitch; | |
| 614 unsigned dstRowBytes = glyph.rowBytes(); | |
| 615 unsigned minRowBytes = SkMin32(srcRowBytes, dstRowBytes); | |
| 616 unsigned extraRowBytes = dstRowBytes - minRowBytes; | |
| 617 | |
| 618 for (int y = fFace->glyph->bitmap.rows - 1; y >= 0; --y) { | |
| 619 memcpy(dst, src, minRowBytes); | |
| 620 memset(dst + minRowBytes, 0, extraRowBytes); | |
| 621 src += srcRowBytes; | |
| 622 dst += dstRowBytes; | |
| 623 } | |
| 624 } else if (fFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO) { | |
| 625 for (int y = 0; y < fFace->glyph->bitmap.rows; ++y) { | |
| 626 uint8_t byte = 0; | |
| 627 int bits = 0; | |
| 628 const uint8_t* src_row = src; | |
| 629 uint8_t* dst_row = dst; | |
| 630 | |
| 631 for (int x = 0; x < fFace->glyph->bitmap.width; ++x) { | |
| 632 if (!bits) { | |
| 633 byte = *src_row++; | |
| 634 bits = 8; | |
| 635 } | |
| 636 | |
| 637 *dst_row++ = byte & 0x80 ? 0xff : 0; | |
| 638 bits--; | |
| 639 byte <<= 1; | |
| 640 } | |
| 641 | |
| 642 src += fFace->glyph->bitmap.pitch; | |
| 643 dst += glyph.rowBytes(); | |
| 644 } | |
| 645 } | |
| 646 } break; | |
| 647 | |
| 648 default: | |
| 649 SkASSERT(!"unknown glyph format"); | |
| 650 goto ERROR; | |
| 651 } | |
| 652 } | |
| 653 | |
| 654 /////////////////////////////////////////////////////////////////////////////// | |
| 655 | |
| 656 #define ft2sk(x) SkFixedToScalar((x) << 10) | |
| 657 | |
| 658 #if FREETYPE_MAJOR >= 2 && FREETYPE_MINOR >= 2 | |
| 659 #define CONST_PARAM const | |
| 660 #else // older freetype doesn't use const here | |
| 661 #define CONST_PARAM | |
| 662 #endif | |
| 663 | |
| 664 static int move_proc(CONST_PARAM FT_Vector* pt, void* ctx) { | |
| 665 SkPath* path = (SkPath*)ctx; | |
| 666 path->close(); // to close the previous contour (if any) | |
| 667 path->moveTo(ft2sk(pt->x), -ft2sk(pt->y)); | |
| 668 return 0; | |
| 669 } | |
| 670 | |
| 671 static int line_proc(CONST_PARAM FT_Vector* pt, void* ctx) { | |
| 672 SkPath* path = (SkPath*)ctx; | |
| 673 path->lineTo(ft2sk(pt->x), -ft2sk(pt->y)); | |
| 674 return 0; | |
| 675 } | |
| 676 | |
| 677 static int quad_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, | |
| 678 void* ctx) { | |
| 679 SkPath* path = (SkPath*)ctx; | |
| 680 path->quadTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), -ft2sk(pt1->y)); | |
| 681 return 0; | |
| 682 } | |
| 683 | |
| 684 static int cubic_proc(CONST_PARAM FT_Vector* pt0, CONST_PARAM FT_Vector* pt1, | |
| 685 CONST_PARAM FT_Vector* pt2, void* ctx) { | |
| 686 SkPath* path = (SkPath*)ctx; | |
| 687 path->cubicTo(ft2sk(pt0->x), -ft2sk(pt0->y), ft2sk(pt1->x), | |
| 688 -ft2sk(pt1->y), ft2sk(pt2->x), -ft2sk(pt2->y)); | |
| 689 return 0; | |
| 690 } | |
| 691 | |
| 692 void SkScalerContext_FreeType::generatePath(const SkGlyph& glyph, | |
| 693 SkPath* path) { | |
| 694 SkAutoMutexAcquire ac(gFTMutex); | |
| 695 | |
| 696 SkASSERT(&glyph && path); | |
| 697 | |
| 698 if (this->setupSize()) { | |
| 699 path->reset(); | |
| 700 return; | |
| 701 } | |
| 702 | |
| 703 uint32_t flags = fLoadGlyphFlags; | |
| 704 flags |= FT_LOAD_NO_BITMAP; // ignore embedded bitmaps so we're sure to get
the outline | |
| 705 flags &= ~FT_LOAD_RENDER; // don't scan convert (we just want the outline) | |
| 706 | |
| 707 FT_Error err = FT_Load_Glyph( fFace, glyph.getGlyphID(fBaseGlyphCount), flag
s); | |
| 708 | |
| 709 if (err != 0) { | |
| 710 SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%
d flags:%d) returned 0x%x\n", | |
| 711 glyph.getGlyphID(fBaseGlyphCount), flags, err)); | |
| 712 path->reset(); | |
| 713 return; | |
| 714 } | |
| 715 | |
| 716 FT_Outline_Funcs funcs; | |
| 717 | |
| 718 funcs.move_to = move_proc; | |
| 719 funcs.line_to = line_proc; | |
| 720 funcs.conic_to = quad_proc; | |
| 721 funcs.cubic_to = cubic_proc; | |
| 722 funcs.shift = 0; | |
| 723 funcs.delta = 0; | |
| 724 | |
| 725 err = FT_Outline_Decompose(&fFace->glyph->outline, &funcs, path); | |
| 726 | |
| 727 if (err != 0) { | |
| 728 SkDEBUGF(("SkScalerContext_FreeType::generatePath: FT_Load_Glyph(glyph:%
d flags:%d) returned 0x%x\n", | |
| 729 glyph.getGlyphID(fBaseGlyphCount), flags, err)); | |
| 730 path->reset(); | |
| 731 return; | |
| 732 } | |
| 733 | |
| 734 path->close(); | |
| 735 } | |
| 736 | |
| 737 void SkScalerContext_FreeType::generateFontMetrics(SkPaint::FontMetrics* mx, | |
| 738 SkPaint::FontMetrics* my) { | |
| 739 if (NULL == mx && NULL == my) { | |
| 740 return; | |
| 741 } | |
| 742 | |
| 743 SkAutoMutexAcquire ac(gFTMutex); | |
| 744 | |
| 745 if (this->setupSize()) { | |
| 746 if (mx) { | |
| 747 bzero(mx, sizeof(SkPaint::FontMetrics)); | |
| 748 } | |
| 749 if (my) { | |
| 750 bzero(my, sizeof(SkPaint::FontMetrics)); | |
| 751 } | |
| 752 return; | |
| 753 } | |
| 754 | |
| 755 SkPoint pts[6]; | |
| 756 SkFixed ys[6]; | |
| 757 FT_Face face = fFace; | |
| 758 int upem = face->units_per_EM; | |
| 759 SkFixed scaleY = fScaleY; | |
| 760 SkFixed mxy = fMatrix22.xy; | |
| 761 SkFixed myy = fMatrix22.yy; | |
| 762 SkScalar xmin = SkIntToScalar(face->bbox.xMin) / upem; | |
| 763 SkScalar xmax = SkIntToScalar(face->bbox.xMax) / upem; | |
| 764 | |
| 765 int leading = face->height - (face->ascender + -face->descender); | |
| 766 if (leading < 0) { | |
| 767 leading = 0; | |
| 768 } | |
| 769 | |
| 770 // Try to get the OS/2 table from the font. This contains the specific | |
| 771 // average font width metrics which Windows uses. | |
| 772 TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(face, ft_sfnt_os2); | |
| 773 | |
| 774 ys[0] = -face->bbox.yMax; | |
| 775 ys[1] = -face->ascender; | |
| 776 ys[2] = -face->descender; | |
| 777 ys[3] = -face->bbox.yMin; | |
| 778 ys[4] = leading; | |
| 779 ys[5] = os2 ? os2->xAvgCharWidth : 0; | |
| 780 | |
| 781 SkScalar x_height; | |
| 782 if (os2 && os2->sxHeight) { | |
| 783 x_height = SkFixedToScalar(SkMulDiv(fScaleX, os2->sxHeight, upem)); | |
| 784 } else { | |
| 785 const FT_UInt x_glyph = FT_Get_Char_Index(fFace, 'x'); | |
| 786 if (x_glyph) { | |
| 787 FT_BBox bbox; | |
| 788 FT_Load_Glyph(fFace, x_glyph, fLoadGlyphFlags); | |
| 789 FT_Outline_Get_CBox(&fFace->glyph->outline, &bbox); | |
| 790 x_height = SkIntToScalar(bbox.yMax) / 64; | |
| 791 } else { | |
| 792 x_height = 0; | |
| 793 } | |
| 794 } | |
| 795 | |
| 796 // convert upem-y values into scalar points | |
| 797 for (int i = 0; i < 6; i++) { | |
| 798 SkFixed y = SkMulDiv(scaleY, ys[i], upem); | |
| 799 SkFixed x = SkFixedMul(mxy, y); | |
| 800 y = SkFixedMul(myy, y); | |
| 801 pts[i].set(SkFixedToScalar(x), SkFixedToScalar(y)); | |
| 802 } | |
| 803 | |
| 804 if (mx) { | |
| 805 mx->fTop = pts[0].fX; | |
| 806 mx->fAscent = pts[1].fX; | |
| 807 mx->fDescent = pts[2].fX; | |
| 808 mx->fBottom = pts[3].fX; | |
| 809 mx->fLeading = pts[4].fX; | |
| 810 mx->fAvgCharWidth = pts[5].fX; | |
| 811 mx->fXMin = xmin; | |
| 812 mx->fXMax = xmax; | |
| 813 mx->fXHeight = x_height; | |
| 814 } | |
| 815 if (my) { | |
| 816 my->fTop = pts[0].fY; | |
| 817 my->fAscent = pts[1].fY; | |
| 818 my->fDescent = pts[2].fY; | |
| 819 my->fBottom = pts[3].fY; | |
| 820 my->fLeading = pts[4].fY; | |
| 821 my->fAvgCharWidth = pts[5].fY; | |
| 822 my->fXMin = xmin; | |
| 823 my->fXMax = xmax; | |
| 824 my->fXHeight = x_height; | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 //////////////////////////////////////////////////////////////////////// | |
| 829 //////////////////////////////////////////////////////////////////////// | |
| 830 | |
| 831 SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) { | |
| 832 SkScalerContext_FreeType* c = SkNEW_ARGS(SkScalerContext_FreeType, (desc)); | |
| 833 if (!c->success()) { | |
| 834 SkDELETE(c); | |
| 835 c = NULL; | |
| 836 } | |
| 837 return c; | |
| 838 } | |
| 839 | |
| 840 /////////////////////////////////////////////////////////////////////////////// | |
| 841 | |
| 842 /* Export this so that other parts of our FonttHost port can make use of our | |
| 843 ability to extract the name+style from a stream, using FreeType's api. | |
| 844 */ | |
| 845 SkTypeface::Style find_name_and_style(SkStream* stream, SkString* name) { | |
| 846 FT_Library library; | |
| 847 if (FT_Init_FreeType(&library)) { | |
| 848 name->set(NULL); | |
| 849 return SkTypeface::kNormal; | |
| 850 } | |
| 851 | |
| 852 FT_Open_Args args; | |
| 853 memset(&args, 0, sizeof(args)); | |
| 854 | |
| 855 const void* memoryBase = stream->getMemoryBase(); | |
| 856 FT_StreamRec streamRec; | |
| 857 | |
| 858 if (NULL != memoryBase) { | |
| 859 args.flags = FT_OPEN_MEMORY; | |
| 860 args.memory_base = (const FT_Byte*)memoryBase; | |
| 861 args.memory_size = stream->getLength(); | |
| 862 } else { | |
| 863 memset(&streamRec, 0, sizeof(streamRec)); | |
| 864 streamRec.size = stream->read(NULL, 0); | |
| 865 streamRec.descriptor.pointer = stream; | |
| 866 streamRec.read = sk_stream_read; | |
| 867 streamRec.close = sk_stream_close; | |
| 868 | |
| 869 args.flags = FT_OPEN_STREAM; | |
| 870 args.stream = &streamRec; | |
| 871 } | |
| 872 | |
| 873 FT_Face face; | |
| 874 if (FT_Open_Face(library, &args, 0, &face)) { | |
| 875 FT_Done_FreeType(library); | |
| 876 name->set(NULL); | |
| 877 return SkTypeface::kNormal; | |
| 878 } | |
| 879 | |
| 880 name->set(face->family_name); | |
| 881 int style = SkTypeface::kNormal; | |
| 882 | |
| 883 if (face->style_flags & FT_STYLE_FLAG_BOLD) { | |
| 884 style |= SkTypeface::kBold; | |
| 885 } | |
| 886 if (face->style_flags & FT_STYLE_FLAG_ITALIC) { | |
| 887 style |= SkTypeface::kItalic; | |
| 888 } | |
| 889 | |
| 890 FT_Done_Face(face); | |
| 891 FT_Done_FreeType(library); | |
| 892 return (SkTypeface::Style)style; | |
| 893 } | |
| 894 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/