1 /***************************************************************************/ 2 /* */ 3 /* ttsubpix.c */ 4 /* */ 5 /* TrueType Subpixel Hinting. */ 6 /* */ 7 /* Copyright 2010-2015 by */ 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ 9 /* */ 10 /* This file is part of the FreeType project, and may only be used, */ 11 /* modified, and distributed under the terms of the FreeType project */ 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 13 /* this file you indicate that you have read the license and */ 14 /* understand and accept it fully. */ 15 /* */ 16 /***************************************************************************/ 17 18 #include <ft2build.h> 19 #include FT_INTERNAL_DEBUG_H 20 #include FT_INTERNAL_CALC_H 21 #include FT_INTERNAL_STREAM_H 22 #include FT_INTERNAL_SFNT_H 23 #include FT_TRUETYPE_TAGS_H 24 #include FT_OUTLINE_H 25 #include FT_TRUETYPE_DRIVER_H 26 27 #include "ttsubpix.h" 28 29 30 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING 31 32 /*************************************************************************/ 33 /* */ 34 /* These rules affect how the TT Interpreter does hinting, with the */ 35 /* goal of doing subpixel hinting by (in general) ignoring x moves. */ 36 /* Some of these rules are fixes that go above and beyond the */ 37 /* stated techniques in the MS whitepaper on Cleartype, due to */ 38 /* artifacts in many glyphs. So, these rules make some glyphs render */ 39 /* better than they do in the MS rasterizer. */ 40 /* */ 41 /* "" string or 0 int/char indicates to apply to all glyphs. */ 42 /* "-" used as dummy placeholders, but any non-matching string works. */ 43 /* */ 44 /* Some of this could arguably be implemented in fontconfig, however: */ 45 /* */ 46 /* - Fontconfig can't set things on a glyph-by-glyph basis. */ 47 /* - The tweaks that happen here are very low-level, from an average */ 48 /* user's point of view and are best implemented in the hinter. */ 49 /* */ 50 /* The goal is to make the subpixel hinting techniques as generalized */ 51 /* as possible across all fonts to prevent the need for extra rules such */ 52 /* as these. */ 53 /* */ 54 /* The rule structure is designed so that entirely new rules can easily */ 55 /* be added when a new compatibility feature is discovered. */ 56 /* */ 57 /* The rule structures could also use some enhancement to handle ranges. */ 58 /* */ 59 /* ****************** WORK IN PROGRESS ******************* */ 60 /* */ 61 62 /* These are `classes' of fonts that can be grouped together and used in */ 63 /* rules below. A blank entry "" is required at the end of these! */ 64 #define FAMILY_CLASS_RULES_SIZE 7 65 66 static const SPH_Font_Class FAMILY_CLASS_Rules 67 [FAMILY_CLASS_RULES_SIZE] = 68 { 69 { "MS Legacy Fonts", 70 { "Aharoni", 71 "Andale Mono", 72 "Andalus", 73 "Angsana New", 74 "AngsanaUPC", 75 "Arabic Transparent", 76 "Arial Black", 77 "Arial Narrow", 78 "Arial Unicode MS", 79 "Arial", 80 "Batang", 81 "Browallia New", 82 "BrowalliaUPC", 83 "Comic Sans MS", 84 "Cordia New", 85 "CordiaUPC", 86 "Courier New", 87 "DFKai-SB", 88 "David Transparent", 89 "David", 90 "DilleniaUPC", 91 "Estrangelo Edessa", 92 "EucrosiaUPC", 93 "FangSong_GB2312", 94 "Fixed Miriam Transparent", 95 "FrankRuehl", 96 "Franklin Gothic Medium", 97 "FreesiaUPC", 98 "Garamond", 99 "Gautami", 100 "Georgia", 101 "Gulim", 102 "Impact", 103 "IrisUPC", 104 "JasmineUPC", 105 "KaiTi_GB2312", 106 "KodchiangUPC", 107 "Latha", 108 "Levenim MT", 109 "LilyUPC", 110 "Lucida Console", 111 "Lucida Sans Unicode", 112 "MS Gothic", 113 "MS Mincho", 114 "MV Boli", 115 "Mangal", 116 "Marlett", 117 "Microsoft Sans Serif", 118 "Mingliu", 119 "Miriam Fixed", 120 "Miriam Transparent", 121 "Miriam", 122 "Narkisim", 123 "Palatino Linotype", 124 "Raavi", 125 "Rod Transparent", 126 "Rod", 127 "Shruti", 128 "SimHei", 129 "Simplified Arabic Fixed", 130 "Simplified Arabic", 131 "Simsun", 132 "Sylfaen", 133 "Symbol", 134 "Tahoma", 135 "Times New Roman", 136 "Traditional Arabic", 137 "Trebuchet MS", 138 "Tunga", 139 "Verdana", 140 "Webdings", 141 "Wingdings", 142 "", 143 }, 144 }, 145 { "Core MS Legacy Fonts", 146 { "Arial Black", 147 "Arial Narrow", 148 "Arial Unicode MS", 149 "Arial", 150 "Comic Sans MS", 151 "Courier New", 152 "Garamond", 153 "Georgia", 154 "Impact", 155 "Lucida Console", 156 "Lucida Sans Unicode", 157 "Microsoft Sans Serif", 158 "Palatino Linotype", 159 "Tahoma", 160 "Times New Roman", 161 "Trebuchet MS", 162 "Verdana", 163 "", 164 }, 165 }, 166 { "Apple Legacy Fonts", 167 { "Geneva", 168 "Times", 169 "Monaco", 170 "Century", 171 "Chalkboard", 172 "Lobster", 173 "Century Gothic", 174 "Optima", 175 "Lucida Grande", 176 "Gill Sans", 177 "Baskerville", 178 "Helvetica", 179 "Helvetica Neue", 180 "", 181 }, 182 }, 183 { "Legacy Sans Fonts", 184 { "Andale Mono", 185 "Arial Unicode MS", 186 "Arial", 187 "Century Gothic", 188 "Comic Sans MS", 189 "Franklin Gothic Medium", 190 "Geneva", 191 "Lucida Console", 192 "Lucida Grande", 193 "Lucida Sans Unicode", 194 "Lucida Sans Typewriter", 195 "Microsoft Sans Serif", 196 "Monaco", 197 "Tahoma", 198 "Trebuchet MS", 199 "Verdana", 200 "", 201 }, 202 }, 203 204 { "Misc Legacy Fonts", 205 { "Dark Courier", "", }, }, 206 { "Verdana Clones", 207 { "DejaVu Sans", 208 "Bitstream Vera Sans", "", }, }, 209 { "Verdana and Clones", 210 { "DejaVu Sans", 211 "Bitstream Vera Sans", 212 "Verdana", "", }, }, 213 }; 214 215 216 /* Define this to force natural (i.e. not bitmap-compatible) widths. */ 217 /* The default leans strongly towards natural widths except for a few */ 218 /* legacy fonts where a selective combination produces nicer results. */ 219 /* #define FORCE_NATURAL_WIDTHS */ 220 221 222 /* Define `classes' of styles that can be grouped together and used in */ 223 /* rules below. A blank entry "" is required at the end of these! */ 224 #define STYLE_CLASS_RULES_SIZE 5 225 226 static const SPH_Font_Class STYLE_CLASS_Rules 227 [STYLE_CLASS_RULES_SIZE] = 228 { 229 { "Regular Class", 230 { "Regular", 231 "Book", 232 "Medium", 233 "Roman", 234 "Normal", 235 "", 236 }, 237 }, 238 { "Regular/Italic Class", 239 { "Regular", 240 "Book", 241 "Medium", 242 "Italic", 243 "Oblique", 244 "Roman", 245 "Normal", 246 "", 247 }, 248 }, 249 { "Bold/BoldItalic Class", 250 { "Bold", 251 "Bold Italic", 252 "Black", 253 "", 254 }, 255 }, 256 { "Bold/Italic/BoldItalic Class", 257 { "Bold", 258 "Bold Italic", 259 "Black", 260 "Italic", 261 "Oblique", 262 "", 263 }, 264 }, 265 { "Regular/Bold Class", 266 { "Regular", 267 "Book", 268 "Medium", 269 "Normal", 270 "Roman", 271 "Bold", 272 "Black", 273 "", 274 }, 275 }, 276 }; 277 278 279 /* Force special legacy fixes for fonts. */ 280 #define COMPATIBILITY_MODE_RULES_SIZE 1 281 282 static const SPH_TweakRule COMPATIBILITY_MODE_Rules 283 [COMPATIBILITY_MODE_RULES_SIZE] = 284 { 285 { "Verdana Clones", 0, "", 0 }, 286 }; 287 288 289 /* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */ 290 #define PIXEL_HINTING_RULES_SIZE 2 291 292 static const SPH_TweakRule PIXEL_HINTING_Rules 293 [PIXEL_HINTING_RULES_SIZE] = 294 { 295 /* these characters are almost always safe */ 296 { "Courier New", 12, "Italic", 'z' }, 297 { "Courier New", 11, "Italic", 'z' }, 298 }; 299 300 301 /* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */ 302 #define DO_SHPIX_RULES_SIZE 1 303 304 static const SPH_TweakRule DO_SHPIX_Rules 305 [DO_SHPIX_RULES_SIZE] = 306 { 307 { "-", 0, "", 0 }, 308 }; 309 310 311 /* Skip Y moves that start with a point that is not on a Y pixel */ 312 /* boundary and don't move that point to a Y pixel boundary. */ 313 #define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 4 314 315 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules 316 [SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] = 317 { 318 /* fix vwxyz thinness*/ 319 { "Consolas", 0, "", 0 }, 320 /* Fix thin middle stems */ 321 { "Core MS Legacy Fonts", 0, "Regular", 0 }, 322 /* Cyrillic small letter I */ 323 { "Legacy Sans Fonts", 0, "", 0 }, 324 /* Fix artifacts with some Regular & Bold */ 325 { "Verdana Clones", 0, "", 0 }, 326 }; 327 328 329 #define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 330 331 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions 332 [SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 333 { 334 /* Fixes < and > */ 335 { "Courier New", 0, "Regular", 0 }, 336 }; 337 338 339 /* Skip Y moves that start with a point that is not on a Y pixel */ 340 /* boundary and don't move that point to a Y pixel boundary. */ 341 #define SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE 2 342 343 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_DELTAP_Rules 344 [SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE] = 345 { 346 /* Maintain thickness of diagonal in 'N' */ 347 { "Times New Roman", 0, "Regular/Bold Class", 'N' }, 348 { "Georgia", 0, "Regular/Bold Class", 'N' }, 349 }; 350 351 352 /* Skip Y moves that move a point off a Y pixel boundary. */ 353 #define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 1 354 355 static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules 356 [SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] = 357 { 358 { "-", 0, "", 0 }, 359 }; 360 361 362 #define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 363 364 static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions 365 [SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 366 { 367 { "-", 0, "", 0 }, 368 }; 369 370 371 /* Round moves that don't move a point to a Y pixel boundary. */ 372 #define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 2 373 374 static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules 375 [ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] = 376 { 377 /* Droid font instructions don't snap Y to pixels */ 378 { "Droid Sans", 0, "Regular/Italic Class", 0 }, 379 { "Droid Sans Mono", 0, "", 0 }, 380 }; 381 382 383 #define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 384 385 static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions 386 [ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 387 { 388 { "-", 0, "", 0 }, 389 }; 390 391 392 /* Allow a Direct_Move along X freedom vector if matched. */ 393 #define ALLOW_X_DMOVE_RULES_SIZE 1 394 395 static const SPH_TweakRule ALLOW_X_DMOVE_Rules 396 [ALLOW_X_DMOVE_RULES_SIZE] = 397 { 398 /* Fixes vanishing diagonal in 4 */ 399 { "Verdana", 0, "Regular", '4' }, 400 }; 401 402 403 /* Return MS rasterizer version 35 if matched. */ 404 #define RASTERIZER_35_RULES_SIZE 8 405 406 static const SPH_TweakRule RASTERIZER_35_Rules 407 [RASTERIZER_35_RULES_SIZE] = 408 { 409 /* This seems to be the only way to make these look good */ 410 { "Times New Roman", 0, "Regular", 'i' }, 411 { "Times New Roman", 0, "Regular", 'j' }, 412 { "Times New Roman", 0, "Regular", 'm' }, 413 { "Times New Roman", 0, "Regular", 'r' }, 414 { "Times New Roman", 0, "Regular", 'a' }, 415 { "Times New Roman", 0, "Regular", 'n' }, 416 { "Times New Roman", 0, "Regular", 'p' }, 417 { "Times", 0, "", 0 }, 418 }; 419 420 421 /* Don't round to the subpixel grid. Round to pixel grid. */ 422 #define NORMAL_ROUND_RULES_SIZE 1 423 424 static const SPH_TweakRule NORMAL_ROUND_Rules 425 [NORMAL_ROUND_RULES_SIZE] = 426 { 427 /* Fix serif thickness for certain ppems */ 428 /* Can probably be generalized somehow */ 429 { "Courier New", 0, "", 0 }, 430 }; 431 432 433 /* Skip IUP instructions if matched. */ 434 #define SKIP_IUP_RULES_SIZE 1 435 436 static const SPH_TweakRule SKIP_IUP_Rules 437 [SKIP_IUP_RULES_SIZE] = 438 { 439 { "Arial", 13, "Regular", 'a' }, 440 }; 441 442 443 /* Skip MIAP Twilight hack if matched. */ 444 #define MIAP_HACK_RULES_SIZE 1 445 446 static const SPH_TweakRule MIAP_HACK_Rules 447 [MIAP_HACK_RULES_SIZE] = 448 { 449 { "Geneva", 12, "", 0 }, 450 }; 451 452 453 /* Skip DELTAP instructions if matched. */ 454 #define ALWAYS_SKIP_DELTAP_RULES_SIZE 23 455 456 static const SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules 457 [ALWAYS_SKIP_DELTAP_RULES_SIZE] = 458 { 459 { "Georgia", 0, "Regular", 'k' }, 460 /* fix various problems with e in different versions */ 461 { "Trebuchet MS", 14, "Regular", 'e' }, 462 { "Trebuchet MS", 13, "Regular", 'e' }, 463 { "Trebuchet MS", 15, "Regular", 'e' }, 464 { "Trebuchet MS", 0, "Italic", 'v' }, 465 { "Trebuchet MS", 0, "Italic", 'w' }, 466 { "Trebuchet MS", 0, "Regular", 'Y' }, 467 { "Arial", 11, "Regular", 's' }, 468 /* prevent problems with '3' and others */ 469 { "Verdana", 10, "Regular", 0 }, 470 { "Verdana", 9, "Regular", 0 }, 471 /* Cyrillic small letter short I */ 472 { "Legacy Sans Fonts", 0, "", 0x438 }, 473 { "Legacy Sans Fonts", 0, "", 0x439 }, 474 { "Arial", 10, "Regular", '6' }, 475 { "Arial", 0, "Bold/BoldItalic Class", 'a' }, 476 /* Make horizontal stems consistent with the rest */ 477 { "Arial", 24, "Bold", 'a' }, 478 { "Arial", 25, "Bold", 'a' }, 479 { "Arial", 24, "Bold", 's' }, 480 { "Arial", 25, "Bold", 's' }, 481 { "Arial", 34, "Bold", 's' }, 482 { "Arial", 35, "Bold", 's' }, 483 { "Arial", 36, "Bold", 's' }, 484 { "Arial", 25, "Regular", 's' }, 485 { "Arial", 26, "Regular", 's' }, 486 }; 487 488 489 /* Always do DELTAP instructions if matched. */ 490 #define ALWAYS_DO_DELTAP_RULES_SIZE 1 491 492 static const SPH_TweakRule ALWAYS_DO_DELTAP_Rules 493 [ALWAYS_DO_DELTAP_RULES_SIZE] = 494 { 495 { "-", 0, "", 0 }, 496 }; 497 498 499 /* Don't allow ALIGNRP after IUP. */ 500 #define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 1 501 502 static const SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules 503 [NO_ALIGNRP_AFTER_IUP_RULES_SIZE] = 504 { 505 /* Prevent creation of dents in outline */ 506 { "-", 0, "", 0 }, 507 }; 508 509 510 /* Don't allow DELTAP after IUP. */ 511 #define NO_DELTAP_AFTER_IUP_RULES_SIZE 1 512 513 static const SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules 514 [NO_DELTAP_AFTER_IUP_RULES_SIZE] = 515 { 516 { "-", 0, "", 0 }, 517 }; 518 519 520 /* Don't allow CALL after IUP. */ 521 #define NO_CALL_AFTER_IUP_RULES_SIZE 1 522 523 static const SPH_TweakRule NO_CALL_AFTER_IUP_Rules 524 [NO_CALL_AFTER_IUP_RULES_SIZE] = 525 { 526 /* Prevent creation of dents in outline */ 527 { "-", 0, "", 0 }, 528 }; 529 530 531 /* De-embolden these glyphs slightly. */ 532 #define DEEMBOLDEN_RULES_SIZE 9 533 534 static const SPH_TweakRule DEEMBOLDEN_Rules 535 [DEEMBOLDEN_RULES_SIZE] = 536 { 537 { "Courier New", 0, "Bold", 'A' }, 538 { "Courier New", 0, "Bold", 'W' }, 539 { "Courier New", 0, "Bold", 'w' }, 540 { "Courier New", 0, "Bold", 'M' }, 541 { "Courier New", 0, "Bold", 'X' }, 542 { "Courier New", 0, "Bold", 'K' }, 543 { "Courier New", 0, "Bold", 'x' }, 544 { "Courier New", 0, "Bold", 'z' }, 545 { "Courier New", 0, "Bold", 'v' }, 546 }; 547 548 549 /* Embolden these glyphs slightly. */ 550 #define EMBOLDEN_RULES_SIZE 2 551 552 static const SPH_TweakRule EMBOLDEN_Rules 553 [EMBOLDEN_RULES_SIZE] = 554 { 555 { "Courier New", 0, "Regular", 0 }, 556 { "Courier New", 0, "Italic", 0 }, 557 }; 558 559 560 /* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */ 561 /* similar to Windows XP. */ 562 #define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12 563 564 static const SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules 565 [TIMES_NEW_ROMAN_HACK_RULES_SIZE] = 566 { 567 { "Times New Roman", 16, "Italic", '2' }, 568 { "Times New Roman", 16, "Italic", '5' }, 569 { "Times New Roman", 16, "Italic", '7' }, 570 { "Times New Roman", 16, "Regular", '2' }, 571 { "Times New Roman", 16, "Regular", '5' }, 572 { "Times New Roman", 16, "Regular", '7' }, 573 { "Times New Roman", 17, "Italic", '2' }, 574 { "Times New Roman", 17, "Italic", '5' }, 575 { "Times New Roman", 17, "Italic", '7' }, 576 { "Times New Roman", 17, "Regular", '2' }, 577 { "Times New Roman", 17, "Regular", '5' }, 578 { "Times New Roman", 17, "Regular", '7' }, 579 }; 580 581 582 /* This fudges distance on 2 to get rid of the vanishing stem issue. */ 583 /* A real solution to this is certainly welcome. */ 584 #define COURIER_NEW_2_HACK_RULES_SIZE 15 585 586 static const SPH_TweakRule COURIER_NEW_2_HACK_Rules 587 [COURIER_NEW_2_HACK_RULES_SIZE] = 588 { 589 { "Courier New", 10, "Regular", '2' }, 590 { "Courier New", 11, "Regular", '2' }, 591 { "Courier New", 12, "Regular", '2' }, 592 { "Courier New", 13, "Regular", '2' }, 593 { "Courier New", 14, "Regular", '2' }, 594 { "Courier New", 15, "Regular", '2' }, 595 { "Courier New", 16, "Regular", '2' }, 596 { "Courier New", 17, "Regular", '2' }, 597 { "Courier New", 18, "Regular", '2' }, 598 { "Courier New", 19, "Regular", '2' }, 599 { "Courier New", 20, "Regular", '2' }, 600 { "Courier New", 21, "Regular", '2' }, 601 { "Courier New", 22, "Regular", '2' }, 602 { "Courier New", 23, "Regular", '2' }, 603 { "Courier New", 24, "Regular", '2' }, 604 }; 605 606 607 #ifndef FORCE_NATURAL_WIDTHS 608 609 /* Use compatible widths with these glyphs. Compatible widths is always */ 610 /* on when doing B/W TrueType instructing, but is used selectively here, */ 611 /* typically on glyphs with 3 or more vertical stems. */ 612 #define COMPATIBLE_WIDTHS_RULES_SIZE 38 613 614 static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules 615 [COMPATIBLE_WIDTHS_RULES_SIZE] = 616 { 617 { "Arial Unicode MS", 12, "Regular Class", 'm' }, 618 { "Arial Unicode MS", 14, "Regular Class", 'm' }, 619 /* Cyrillic small letter sha */ 620 { "Arial", 10, "Regular Class", 0x448 }, 621 { "Arial", 11, "Regular Class", 'm' }, 622 { "Arial", 12, "Regular Class", 'm' }, 623 /* Cyrillic small letter sha */ 624 { "Arial", 12, "Regular Class", 0x448 }, 625 { "Arial", 13, "Regular Class", 0x448 }, 626 { "Arial", 14, "Regular Class", 'm' }, 627 /* Cyrillic small letter sha */ 628 { "Arial", 14, "Regular Class", 0x448 }, 629 { "Arial", 15, "Regular Class", 0x448 }, 630 { "Arial", 17, "Regular Class", 'm' }, 631 { "DejaVu Sans", 15, "Regular Class", 0 }, 632 { "Microsoft Sans Serif", 11, "Regular Class", 0 }, 633 { "Microsoft Sans Serif", 12, "Regular Class", 0 }, 634 { "Segoe UI", 11, "Regular Class", 0 }, 635 { "Monaco", 0, "Regular Class", 0 }, 636 { "Segoe UI", 12, "Regular Class", 'm' }, 637 { "Segoe UI", 14, "Regular Class", 'm' }, 638 { "Tahoma", 11, "Regular Class", 0 }, 639 { "Times New Roman", 16, "Regular Class", 'c' }, 640 { "Times New Roman", 16, "Regular Class", 'm' }, 641 { "Times New Roman", 16, "Regular Class", 'o' }, 642 { "Times New Roman", 16, "Regular Class", 'w' }, 643 { "Trebuchet MS", 11, "Regular Class", 0 }, 644 { "Trebuchet MS", 12, "Regular Class", 0 }, 645 { "Trebuchet MS", 14, "Regular Class", 0 }, 646 { "Trebuchet MS", 15, "Regular Class", 0 }, 647 { "Ubuntu", 12, "Regular Class", 'm' }, 648 /* Cyrillic small letter sha */ 649 { "Verdana", 10, "Regular Class", 0x448 }, 650 { "Verdana", 11, "Regular Class", 0x448 }, 651 { "Verdana and Clones", 12, "Regular Class", 'i' }, 652 { "Verdana and Clones", 12, "Regular Class", 'j' }, 653 { "Verdana and Clones", 12, "Regular Class", 'l' }, 654 { "Verdana and Clones", 12, "Regular Class", 'm' }, 655 { "Verdana and Clones", 13, "Regular Class", 'i' }, 656 { "Verdana and Clones", 13, "Regular Class", 'j' }, 657 { "Verdana and Clones", 13, "Regular Class", 'l' }, 658 { "Verdana and Clones", 14, "Regular Class", 'm' }, 659 }; 660 661 662 /* Scaling slightly in the x-direction prior to hinting results in */ 663 /* more visually pleasing glyphs in certain cases. */ 664 /* This sometimes needs to be coordinated with compatible width rules. */ 665 /* A value of 1000 corresponds to a scaled value of 1.0. */ 666 667 #define X_SCALING_RULES_SIZE 50 668 669 static const SPH_ScaleRule X_SCALING_Rules[X_SCALING_RULES_SIZE] = 670 { 671 { "DejaVu Sans", 12, "Regular Class", 'm', 950 }, 672 { "Verdana and Clones", 12, "Regular Class", 'a', 1100 }, 673 { "Verdana and Clones", 13, "Regular Class", 'a', 1050 }, 674 { "Arial", 11, "Regular Class", 'm', 975 }, 675 { "Arial", 12, "Regular Class", 'm', 1050 }, 676 /* Cyrillic small letter el */ 677 { "Arial", 13, "Regular Class", 0x43B, 950 }, 678 { "Arial", 13, "Regular Class", 'o', 950 }, 679 { "Arial", 13, "Regular Class", 'e', 950 }, 680 { "Arial", 14, "Regular Class", 'm', 950 }, 681 /* Cyrillic small letter el */ 682 { "Arial", 15, "Regular Class", 0x43B, 925 }, 683 { "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 }, 684 { "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 }, 685 { "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 }, 686 { "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 }, 687 { "DejaVu Sans", 12, "Regular Class", 'l', 975 }, 688 { "DejaVu Sans", 12, "Regular Class", 'i', 975 }, 689 { "DejaVu Sans", 12, "Regular Class", 'j', 975 }, 690 { "DejaVu Sans", 13, "Regular Class", 'l', 950 }, 691 { "DejaVu Sans", 13, "Regular Class", 'i', 950 }, 692 { "DejaVu Sans", 13, "Regular Class", 'j', 950 }, 693 { "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 }, 694 { "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 }, 695 { "Georgia", 10, "", 0, 1050 }, 696 { "Georgia", 11, "", 0, 1100 }, 697 { "Georgia", 12, "", 0, 1025 }, 698 { "Georgia", 13, "", 0, 1050 }, 699 { "Georgia", 16, "", 0, 1050 }, 700 { "Georgia", 17, "", 0, 1030 }, 701 { "Liberation Sans", 12, "Regular Class", 'm', 1100 }, 702 { "Lucida Grande", 11, "Regular Class", 'm', 1100 }, 703 { "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 }, 704 { "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 }, 705 { "Segoe UI", 12, "Regular Class", 'H', 1050 }, 706 { "Segoe UI", 12, "Regular Class", 'm', 1050 }, 707 { "Segoe UI", 14, "Regular Class", 'm', 1050 }, 708 { "Tahoma", 11, "Regular Class", 'i', 975 }, 709 { "Tahoma", 11, "Regular Class", 'l', 975 }, 710 { "Tahoma", 11, "Regular Class", 'j', 900 }, 711 { "Tahoma", 11, "Regular Class", 'm', 918 }, 712 { "Verdana", 10, "Regular/Italic Class", 0, 1100 }, 713 { "Verdana", 12, "Regular Class", 'm', 975 }, 714 { "Verdana", 12, "Regular/Italic Class", 0, 1050 }, 715 { "Verdana", 13, "Regular/Italic Class", 'i', 950 }, 716 { "Verdana", 13, "Regular/Italic Class", 'j', 950 }, 717 { "Verdana", 13, "Regular/Italic Class", 'l', 950 }, 718 { "Verdana", 16, "Regular Class", 0, 1050 }, 719 { "Verdana", 9, "Regular/Italic Class", 0, 1050 }, 720 { "Times New Roman", 16, "Regular Class", 'm', 918 }, 721 { "Trebuchet MS", 11, "Regular Class", 'm', 800 }, 722 { "Trebuchet MS", 12, "Regular Class", 'm', 800 }, 723 }; 724 725 #else 726 727 #define COMPATIBLE_WIDTHS_RULES_SIZE 1 728 729 static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules 730 [COMPATIBLE_WIDTHS_RULES_SIZE] = 731 { 732 { "-", 0, "", 0 }, 733 }; 734 735 736 #define X_SCALING_RULES_SIZE 1 737 738 static const SPH_ScaleRule X_SCALING_Rules 739 [X_SCALING_RULES_SIZE] = 740 { 741 { "-", 0, "", 0, 1000 }, 742 }; 743 744 #endif /* FORCE_NATURAL_WIDTHS */ 745 746 747 static FT_Bool 748 is_member_of_family_class( const FT_String* detected_font_name, 749 const FT_String* rule_font_name ) 750 { 751 FT_UInt i, j; 752 753 754 /* Does font name match rule family? */ 755 if ( strcmp( detected_font_name, rule_font_name ) == 0 ) 756 return TRUE; 757 758 /* Is font name a wildcard ""? */ 759 if ( strcmp( rule_font_name, "" ) == 0 ) 760 return TRUE; 761 762 /* Is font name contained in a class list? */ 763 for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ ) 764 { 765 if ( strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 ) 766 { 767 for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) 768 { 769 if ( strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 ) 770 continue; 771 if ( strcmp( FAMILY_CLASS_Rules[i].member[j], 772 detected_font_name ) == 0 ) 773 return TRUE; 774 } 775 } 776 } 777 778 return FALSE; 779 } 780 781 782 static FT_Bool 783 is_member_of_style_class( const FT_String* detected_font_style, 784 const FT_String* rule_font_style ) 785 { 786 FT_UInt i, j; 787 788 789 /* Does font style match rule style? */ 790 if ( strcmp( detected_font_style, rule_font_style ) == 0 ) 791 return TRUE; 792 793 /* Is font style a wildcard ""? */ 794 if ( strcmp( rule_font_style, "" ) == 0 ) 795 return TRUE; 796 797 /* Is font style contained in a class list? */ 798 for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ ) 799 { 800 if ( strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 ) 801 { 802 for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) 803 { 804 if ( strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 ) 805 continue; 806 if ( strcmp( STYLE_CLASS_Rules[i].member[j], 807 detected_font_style ) == 0 ) 808 return TRUE; 809 } 810 } 811 } 812 813 return FALSE; 814 } 815 816 817 FT_LOCAL_DEF( FT_Bool ) 818 sph_test_tweak( TT_Face face, 819 const FT_String* family, 820 FT_UInt ppem, 821 const FT_String* style, 822 FT_UInt glyph_index, 823 const SPH_TweakRule* rule, 824 FT_UInt num_rules ) 825 { 826 FT_UInt i; 827 828 829 /* rule checks may be able to be optimized further */ 830 for ( i = 0; i < num_rules; i++ ) 831 { 832 if ( family && 833 ( is_member_of_family_class ( family, rule[i].family ) ) ) 834 if ( rule[i].ppem == 0 || 835 rule[i].ppem == ppem ) 836 if ( style && 837 is_member_of_style_class ( style, rule[i].style ) ) 838 if ( rule[i].glyph == 0 || 839 FT_Get_Char_Index( (FT_Face)face, 840 rule[i].glyph ) == glyph_index ) 841 return TRUE; 842 } 843 844 return FALSE; 845 } 846 847 848 static FT_UInt 849 scale_test_tweak( TT_Face face, 850 const FT_String* family, 851 FT_UInt ppem, 852 const FT_String* style, 853 FT_UInt glyph_index, 854 const SPH_ScaleRule* rule, 855 FT_UInt num_rules ) 856 { 857 FT_UInt i; 858 859 860 /* rule checks may be able to be optimized further */ 861 for ( i = 0; i < num_rules; i++ ) 862 { 863 if ( family && 864 ( is_member_of_family_class ( family, rule[i].family ) ) ) 865 if ( rule[i].ppem == 0 || 866 rule[i].ppem == ppem ) 867 if ( style && 868 is_member_of_style_class( style, rule[i].style ) ) 869 if ( rule[i].glyph == 0 || 870 FT_Get_Char_Index( (FT_Face)face, 871 rule[i].glyph ) == glyph_index ) 872 return rule[i].scale; 873 } 874 875 return 1000; 876 } 877 878 879 FT_LOCAL_DEF( FT_UInt ) 880 sph_test_tweak_x_scaling( TT_Face face, 881 const FT_String* family, 882 FT_UInt ppem, 883 const FT_String* style, 884 FT_UInt glyph_index ) 885 { 886 return scale_test_tweak( face, family, ppem, style, glyph_index, 887 X_SCALING_Rules, X_SCALING_RULES_SIZE ); 888 } 889 890 891 #define TWEAK_RULES( x ) \ 892 if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ 893 x##_Rules, x##_RULES_SIZE ) ) \ 894 loader->exec->sph_tweak_flags |= SPH_TWEAK_##x; 895 896 #define TWEAK_RULES_EXCEPTIONS( x ) \ 897 if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ 898 x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \ 899 loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x; 900 901 902 FT_LOCAL_DEF( void ) 903 sph_set_tweaks( TT_Loader loader, 904 FT_UInt glyph_index ) 905 { 906 TT_Face face = (TT_Face)loader->face; 907 FT_String* family = face->root.family_name; 908 FT_UInt ppem = loader->size->metrics.x_ppem; 909 FT_String* style = face->root.style_name; 910 911 912 /* don't apply rules if style isn't set */ 913 if ( !face->root.style_name ) 914 return; 915 916 #ifdef SPH_DEBUG_MORE_VERBOSE 917 printf( "%s,%d,%s,%c=%d ", 918 family, ppem, style, glyph_index, glyph_index ); 919 #endif 920 921 TWEAK_RULES( PIXEL_HINTING ); 922 923 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING ) 924 { 925 loader->exec->ignore_x_mode = FALSE; 926 return; 927 } 928 929 TWEAK_RULES( ALLOW_X_DMOVE ); 930 TWEAK_RULES( ALWAYS_DO_DELTAP ); 931 TWEAK_RULES( ALWAYS_SKIP_DELTAP ); 932 TWEAK_RULES( DEEMBOLDEN ); 933 TWEAK_RULES( DO_SHPIX ); 934 TWEAK_RULES( EMBOLDEN ); 935 TWEAK_RULES( MIAP_HACK ); 936 TWEAK_RULES( NORMAL_ROUND ); 937 TWEAK_RULES( NO_ALIGNRP_AFTER_IUP ); 938 TWEAK_RULES( NO_CALL_AFTER_IUP ); 939 TWEAK_RULES( NO_DELTAP_AFTER_IUP ); 940 TWEAK_RULES( RASTERIZER_35 ); 941 TWEAK_RULES( SKIP_IUP ); 942 943 TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES ); 944 TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES ); 945 946 TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES_DELTAP ); 947 948 TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES ); 949 TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES ); 950 951 TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES ); 952 TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES ); 953 954 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) 955 { 956 if ( loader->exec->rasterizer_version != TT_INTERPRETER_VERSION_35 ) 957 { 958 loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 959 loader->exec->size->cvt_ready = -1; 960 961 tt_size_ready_bytecode( 962 loader->exec->size, 963 FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); 964 } 965 else 966 loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 967 } 968 else 969 { 970 if ( loader->exec->rasterizer_version != 971 SPH_OPTION_SET_RASTERIZER_VERSION ) 972 { 973 loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 974 loader->exec->size->cvt_ready = -1; 975 976 tt_size_ready_bytecode( 977 loader->exec->size, 978 FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); 979 } 980 else 981 loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 982 } 983 984 if ( IS_HINTED( loader->load_flags ) ) 985 { 986 TWEAK_RULES( TIMES_NEW_ROMAN_HACK ); 987 TWEAK_RULES( COURIER_NEW_2_HACK ); 988 } 989 990 if ( sph_test_tweak( face, family, ppem, style, glyph_index, 991 COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) ) 992 loader->exec->face->sph_compatibility_mode = TRUE; 993 994 995 if ( IS_HINTED( loader->load_flags ) ) 996 { 997 if ( sph_test_tweak( face, family, ppem, style, glyph_index, 998 COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) ) 999 loader->exec->compatible_widths |= TRUE; 1000 } 1001 } 1002 1003 #else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 1004 1005 /* ANSI C doesn't like empty source files */ 1006 typedef int _tt_subpix_dummy; 1007 1008 #endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */ 1009 1010 1011 /* END */ 1012
