1 /***************************************************************************/ 2 /* */ 3 /* ttsubpix.c */ 4 /* */ 5 /* TrueType Subpixel Hinting. */ 6 /* */ 7 /* Copyright 2010-2018 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_DRIVER_H 26 27 #include "ttsubpix.h" 28 29 30 #if defined( TT_USE_BYTECODE_INTERPRETER ) && \ 31 defined( TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY ) 32 33 /*************************************************************************/ 34 /* */ 35 /* These rules affect how the TT Interpreter does hinting, with the */ 36 /* goal of doing subpixel hinting by (in general) ignoring x moves. */ 37 /* Some of these rules are fixes that go above and beyond the */ 38 /* stated techniques in the MS whitepaper on Cleartype, due to */ 39 /* artifacts in many glyphs. So, these rules make some glyphs render */ 40 /* better than they do in the MS rasterizer. */ 41 /* */ 42 /* "" string or 0 int/char indicates to apply to all glyphs. */ 43 /* "-" used as dummy placeholders, but any non-matching string works. */ 44 /* */ 45 /* Some of this could arguably be implemented in fontconfig, however: */ 46 /* */ 47 /* - Fontconfig can't set things on a glyph-by-glyph basis. */ 48 /* - The tweaks that happen here are very low-level, from an average */ 49 /* user's point of view and are best implemented in the hinter. */ 50 /* */ 51 /* The goal is to make the subpixel hinting techniques as generalized */ 52 /* as possible across all fonts to prevent the need for extra rules such */ 53 /* as these. */ 54 /* */ 55 /* The rule structure is designed so that entirely new rules can easily */ 56 /* be added when a new compatibility feature is discovered. */ 57 /* */ 58 /* The rule structures could also use some enhancement to handle ranges. */ 59 /* */ 60 /* ****************** WORK IN PROGRESS ******************* */ 61 /* */ 62 63 /* These are `classes' of fonts that can be grouped together and used in */ 64 /* rules below. A blank entry "" is required at the end of these! */ 65 #define FAMILY_CLASS_RULES_SIZE 7 66 67 static const SPH_Font_Class FAMILY_CLASS_Rules 68 [FAMILY_CLASS_RULES_SIZE] = 69 { 70 { "MS Legacy Fonts", 71 { "Aharoni", 72 "Andale Mono", 73 "Andalus", 74 "Angsana New", 75 "AngsanaUPC", 76 "Arabic Transparent", 77 "Arial Black", 78 "Arial Narrow", 79 "Arial Unicode MS", 80 "Arial", 81 "Batang", 82 "Browallia New", 83 "BrowalliaUPC", 84 "Comic Sans MS", 85 "Cordia New", 86 "CordiaUPC", 87 "Courier New", 88 "DFKai-SB", 89 "David Transparent", 90 "David", 91 "DilleniaUPC", 92 "Estrangelo Edessa", 93 "EucrosiaUPC", 94 "FangSong_GB2312", 95 "Fixed Miriam Transparent", 96 "FrankRuehl", 97 "Franklin Gothic Medium", 98 "FreesiaUPC", 99 "Garamond", 100 "Gautami", 101 "Georgia", 102 "Gulim", 103 "Impact", 104 "IrisUPC", 105 "JasmineUPC", 106 "KaiTi_GB2312", 107 "KodchiangUPC", 108 "Latha", 109 "Levenim MT", 110 "LilyUPC", 111 "Lucida Console", 112 "Lucida Sans Unicode", 113 "MS Gothic", 114 "MS Mincho", 115 "MV Boli", 116 "Mangal", 117 "Marlett", 118 "Microsoft Sans Serif", 119 "Mingliu", 120 "Miriam Fixed", 121 "Miriam Transparent", 122 "Miriam", 123 "Narkisim", 124 "Palatino Linotype", 125 "Raavi", 126 "Rod Transparent", 127 "Rod", 128 "Shruti", 129 "SimHei", 130 "Simplified Arabic Fixed", 131 "Simplified Arabic", 132 "Simsun", 133 "Sylfaen", 134 "Symbol", 135 "Tahoma", 136 "Times New Roman", 137 "Traditional Arabic", 138 "Trebuchet MS", 139 "Tunga", 140 "Verdana", 141 "Webdings", 142 "Wingdings", 143 "", 144 }, 145 }, 146 { "Core MS Legacy Fonts", 147 { "Arial Black", 148 "Arial Narrow", 149 "Arial Unicode MS", 150 "Arial", 151 "Comic Sans MS", 152 "Courier New", 153 "Garamond", 154 "Georgia", 155 "Impact", 156 "Lucida Console", 157 "Lucida Sans Unicode", 158 "Microsoft Sans Serif", 159 "Palatino Linotype", 160 "Tahoma", 161 "Times New Roman", 162 "Trebuchet MS", 163 "Verdana", 164 "", 165 }, 166 }, 167 { "Apple Legacy Fonts", 168 { "Geneva", 169 "Times", 170 "Monaco", 171 "Century", 172 "Chalkboard", 173 "Lobster", 174 "Century Gothic", 175 "Optima", 176 "Lucida Grande", 177 "Gill Sans", 178 "Baskerville", 179 "Helvetica", 180 "Helvetica Neue", 181 "", 182 }, 183 }, 184 { "Legacy Sans Fonts", 185 { "Andale Mono", 186 "Arial Unicode MS", 187 "Arial", 188 "Century Gothic", 189 "Comic Sans MS", 190 "Franklin Gothic Medium", 191 "Geneva", 192 "Lucida Console", 193 "Lucida Grande", 194 "Lucida Sans Unicode", 195 "Lucida Sans Typewriter", 196 "Microsoft Sans Serif", 197 "Monaco", 198 "Tahoma", 199 "Trebuchet MS", 200 "Verdana", 201 "", 202 }, 203 }, 204 205 { "Misc Legacy Fonts", 206 { "Dark Courier", "", }, }, 207 { "Verdana Clones", 208 { "DejaVu Sans", 209 "Bitstream Vera Sans", "", }, }, 210 { "Verdana and Clones", 211 { "DejaVu Sans", 212 "Bitstream Vera Sans", 213 "Verdana", "", }, }, 214 }; 215 216 217 /* Define this to force natural (i.e. not bitmap-compatible) widths. */ 218 /* The default leans strongly towards natural widths except for a few */ 219 /* legacy fonts where a selective combination produces nicer results. */ 220 /* #define FORCE_NATURAL_WIDTHS */ 221 222 223 /* Define `classes' of styles that can be grouped together and used in */ 224 /* rules below. A blank entry "" is required at the end of these! */ 225 #define STYLE_CLASS_RULES_SIZE 5 226 227 static const SPH_Font_Class STYLE_CLASS_Rules 228 [STYLE_CLASS_RULES_SIZE] = 229 { 230 { "Regular Class", 231 { "Regular", 232 "Book", 233 "Medium", 234 "Roman", 235 "Normal", 236 "", 237 }, 238 }, 239 { "Regular/Italic Class", 240 { "Regular", 241 "Book", 242 "Medium", 243 "Italic", 244 "Oblique", 245 "Roman", 246 "Normal", 247 "", 248 }, 249 }, 250 { "Bold/BoldItalic Class", 251 { "Bold", 252 "Bold Italic", 253 "Black", 254 "", 255 }, 256 }, 257 { "Bold/Italic/BoldItalic Class", 258 { "Bold", 259 "Bold Italic", 260 "Black", 261 "Italic", 262 "Oblique", 263 "", 264 }, 265 }, 266 { "Regular/Bold Class", 267 { "Regular", 268 "Book", 269 "Medium", 270 "Normal", 271 "Roman", 272 "Bold", 273 "Black", 274 "", 275 }, 276 }, 277 }; 278 279 280 /* Force special legacy fixes for fonts. */ 281 #define COMPATIBILITY_MODE_RULES_SIZE 1 282 283 static const SPH_TweakRule COMPATIBILITY_MODE_Rules 284 [COMPATIBILITY_MODE_RULES_SIZE] = 285 { 286 { "Verdana Clones", 0, "", 0 }, 287 }; 288 289 290 /* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */ 291 #define PIXEL_HINTING_RULES_SIZE 2 292 293 static const SPH_TweakRule PIXEL_HINTING_Rules 294 [PIXEL_HINTING_RULES_SIZE] = 295 { 296 /* these characters are almost always safe */ 297 { "Courier New", 12, "Italic", 'z' }, 298 { "Courier New", 11, "Italic", 'z' }, 299 }; 300 301 302 /* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */ 303 #define DO_SHPIX_RULES_SIZE 1 304 305 static const SPH_TweakRule DO_SHPIX_Rules 306 [DO_SHPIX_RULES_SIZE] = 307 { 308 { "-", 0, "", 0 }, 309 }; 310 311 312 /* Skip Y moves that start with a point that is not on a Y pixel */ 313 /* boundary and don't move that point to a Y pixel boundary. */ 314 #define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 4 315 316 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules 317 [SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] = 318 { 319 /* fix vwxyz thinness*/ 320 { "Consolas", 0, "", 0 }, 321 /* Fix thin middle stems */ 322 { "Core MS Legacy Fonts", 0, "Regular", 0 }, 323 /* Cyrillic small letter I */ 324 { "Legacy Sans Fonts", 0, "", 0 }, 325 /* Fix artifacts with some Regular & Bold */ 326 { "Verdana Clones", 0, "", 0 }, 327 }; 328 329 330 #define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 331 332 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions 333 [SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 334 { 335 /* Fixes < and > */ 336 { "Courier New", 0, "Regular", 0 }, 337 }; 338 339 340 /* Skip Y moves that start with a point that is not on a Y pixel */ 341 /* boundary and don't move that point to a Y pixel boundary. */ 342 #define SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE 2 343 344 static const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_DELTAP_Rules 345 [SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE] = 346 { 347 /* Maintain thickness of diagonal in 'N' */ 348 { "Times New Roman", 0, "Regular/Bold Class", 'N' }, 349 { "Georgia", 0, "Regular/Bold Class", 'N' }, 350 }; 351 352 353 /* Skip Y moves that move a point off a Y pixel boundary. */ 354 #define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 1 355 356 static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules 357 [SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] = 358 { 359 { "-", 0, "", 0 }, 360 }; 361 362 363 #define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 364 365 static const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions 366 [SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 367 { 368 { "-", 0, "", 0 }, 369 }; 370 371 372 /* Round moves that don't move a point to a Y pixel boundary. */ 373 #define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 2 374 375 static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules 376 [ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] = 377 { 378 /* Droid font instructions don't snap Y to pixels */ 379 { "Droid Sans", 0, "Regular/Italic Class", 0 }, 380 { "Droid Sans Mono", 0, "", 0 }, 381 }; 382 383 384 #define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1 385 386 static const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions 387 [ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] = 388 { 389 { "-", 0, "", 0 }, 390 }; 391 392 393 /* Allow a Direct_Move along X freedom vector if matched. */ 394 #define ALLOW_X_DMOVE_RULES_SIZE 1 395 396 static const SPH_TweakRule ALLOW_X_DMOVE_Rules 397 [ALLOW_X_DMOVE_RULES_SIZE] = 398 { 399 /* Fixes vanishing diagonal in 4 */ 400 { "Verdana", 0, "Regular", '4' }, 401 }; 402 403 404 /* Return MS rasterizer version 35 if matched. */ 405 #define RASTERIZER_35_RULES_SIZE 8 406 407 static const SPH_TweakRule RASTERIZER_35_Rules 408 [RASTERIZER_35_RULES_SIZE] = 409 { 410 /* This seems to be the only way to make these look good */ 411 { "Times New Roman", 0, "Regular", 'i' }, 412 { "Times New Roman", 0, "Regular", 'j' }, 413 { "Times New Roman", 0, "Regular", 'm' }, 414 { "Times New Roman", 0, "Regular", 'r' }, 415 { "Times New Roman", 0, "Regular", 'a' }, 416 { "Times New Roman", 0, "Regular", 'n' }, 417 { "Times New Roman", 0, "Regular", 'p' }, 418 { "Times", 0, "", 0 }, 419 }; 420 421 422 /* Don't round to the subpixel grid. Round to pixel grid. */ 423 #define NORMAL_ROUND_RULES_SIZE 1 424 425 static const SPH_TweakRule NORMAL_ROUND_Rules 426 [NORMAL_ROUND_RULES_SIZE] = 427 { 428 /* Fix serif thickness for certain ppems */ 429 /* Can probably be generalized somehow */ 430 { "Courier New", 0, "", 0 }, 431 }; 432 433 434 /* Skip IUP instructions if matched. */ 435 #define SKIP_IUP_RULES_SIZE 1 436 437 static const SPH_TweakRule SKIP_IUP_Rules 438 [SKIP_IUP_RULES_SIZE] = 439 { 440 { "Arial", 13, "Regular", 'a' }, 441 }; 442 443 444 /* Skip MIAP Twilight hack if matched. */ 445 #define MIAP_HACK_RULES_SIZE 1 446 447 static const SPH_TweakRule MIAP_HACK_Rules 448 [MIAP_HACK_RULES_SIZE] = 449 { 450 { "Geneva", 12, "", 0 }, 451 }; 452 453 454 /* Skip DELTAP instructions if matched. */ 455 #define ALWAYS_SKIP_DELTAP_RULES_SIZE 23 456 457 static const SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules 458 [ALWAYS_SKIP_DELTAP_RULES_SIZE] = 459 { 460 { "Georgia", 0, "Regular", 'k' }, 461 /* fix various problems with e in different versions */ 462 { "Trebuchet MS", 14, "Regular", 'e' }, 463 { "Trebuchet MS", 13, "Regular", 'e' }, 464 { "Trebuchet MS", 15, "Regular", 'e' }, 465 { "Trebuchet MS", 0, "Italic", 'v' }, 466 { "Trebuchet MS", 0, "Italic", 'w' }, 467 { "Trebuchet MS", 0, "Regular", 'Y' }, 468 { "Arial", 11, "Regular", 's' }, 469 /* prevent problems with '3' and others */ 470 { "Verdana", 10, "Regular", 0 }, 471 { "Verdana", 9, "Regular", 0 }, 472 /* Cyrillic small letter short I */ 473 { "Legacy Sans Fonts", 0, "", 0x438 }, 474 { "Legacy Sans Fonts", 0, "", 0x439 }, 475 { "Arial", 10, "Regular", '6' }, 476 { "Arial", 0, "Bold/BoldItalic Class", 'a' }, 477 /* Make horizontal stems consistent with the rest */ 478 { "Arial", 24, "Bold", 'a' }, 479 { "Arial", 25, "Bold", 'a' }, 480 { "Arial", 24, "Bold", 's' }, 481 { "Arial", 25, "Bold", 's' }, 482 { "Arial", 34, "Bold", 's' }, 483 { "Arial", 35, "Bold", 's' }, 484 { "Arial", 36, "Bold", 's' }, 485 { "Arial", 25, "Regular", 's' }, 486 { "Arial", 26, "Regular", 's' }, 487 }; 488 489 490 /* Always do DELTAP instructions if matched. */ 491 #define ALWAYS_DO_DELTAP_RULES_SIZE 1 492 493 static const SPH_TweakRule ALWAYS_DO_DELTAP_Rules 494 [ALWAYS_DO_DELTAP_RULES_SIZE] = 495 { 496 { "-", 0, "", 0 }, 497 }; 498 499 500 /* Don't allow ALIGNRP after IUP. */ 501 #define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 1 502 503 static const SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules 504 [NO_ALIGNRP_AFTER_IUP_RULES_SIZE] = 505 { 506 /* Prevent creation of dents in outline */ 507 { "-", 0, "", 0 }, 508 }; 509 510 511 /* Don't allow DELTAP after IUP. */ 512 #define NO_DELTAP_AFTER_IUP_RULES_SIZE 1 513 514 static const SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules 515 [NO_DELTAP_AFTER_IUP_RULES_SIZE] = 516 { 517 { "-", 0, "", 0 }, 518 }; 519 520 521 /* Don't allow CALL after IUP. */ 522 #define NO_CALL_AFTER_IUP_RULES_SIZE 1 523 524 static const SPH_TweakRule NO_CALL_AFTER_IUP_Rules 525 [NO_CALL_AFTER_IUP_RULES_SIZE] = 526 { 527 /* Prevent creation of dents in outline */ 528 { "-", 0, "", 0 }, 529 }; 530 531 532 /* De-embolden these glyphs slightly. */ 533 #define DEEMBOLDEN_RULES_SIZE 9 534 535 static const SPH_TweakRule DEEMBOLDEN_Rules 536 [DEEMBOLDEN_RULES_SIZE] = 537 { 538 { "Courier New", 0, "Bold", 'A' }, 539 { "Courier New", 0, "Bold", 'W' }, 540 { "Courier New", 0, "Bold", 'w' }, 541 { "Courier New", 0, "Bold", 'M' }, 542 { "Courier New", 0, "Bold", 'X' }, 543 { "Courier New", 0, "Bold", 'K' }, 544 { "Courier New", 0, "Bold", 'x' }, 545 { "Courier New", 0, "Bold", 'z' }, 546 { "Courier New", 0, "Bold", 'v' }, 547 }; 548 549 550 /* Embolden these glyphs slightly. */ 551 #define EMBOLDEN_RULES_SIZE 2 552 553 static const SPH_TweakRule EMBOLDEN_Rules 554 [EMBOLDEN_RULES_SIZE] = 555 { 556 { "Courier New", 0, "Regular", 0 }, 557 { "Courier New", 0, "Italic", 0 }, 558 }; 559 560 561 /* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */ 562 /* similar to Windows XP. */ 563 #define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12 564 565 static const SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules 566 [TIMES_NEW_ROMAN_HACK_RULES_SIZE] = 567 { 568 { "Times New Roman", 16, "Italic", '2' }, 569 { "Times New Roman", 16, "Italic", '5' }, 570 { "Times New Roman", 16, "Italic", '7' }, 571 { "Times New Roman", 16, "Regular", '2' }, 572 { "Times New Roman", 16, "Regular", '5' }, 573 { "Times New Roman", 16, "Regular", '7' }, 574 { "Times New Roman", 17, "Italic", '2' }, 575 { "Times New Roman", 17, "Italic", '5' }, 576 { "Times New Roman", 17, "Italic", '7' }, 577 { "Times New Roman", 17, "Regular", '2' }, 578 { "Times New Roman", 17, "Regular", '5' }, 579 { "Times New Roman", 17, "Regular", '7' }, 580 }; 581 582 583 /* This fudges distance on 2 to get rid of the vanishing stem issue. */ 584 /* A real solution to this is certainly welcome. */ 585 #define COURIER_NEW_2_HACK_RULES_SIZE 15 586 587 static const SPH_TweakRule COURIER_NEW_2_HACK_Rules 588 [COURIER_NEW_2_HACK_RULES_SIZE] = 589 { 590 { "Courier New", 10, "Regular", '2' }, 591 { "Courier New", 11, "Regular", '2' }, 592 { "Courier New", 12, "Regular", '2' }, 593 { "Courier New", 13, "Regular", '2' }, 594 { "Courier New", 14, "Regular", '2' }, 595 { "Courier New", 15, "Regular", '2' }, 596 { "Courier New", 16, "Regular", '2' }, 597 { "Courier New", 17, "Regular", '2' }, 598 { "Courier New", 18, "Regular", '2' }, 599 { "Courier New", 19, "Regular", '2' }, 600 { "Courier New", 20, "Regular", '2' }, 601 { "Courier New", 21, "Regular", '2' }, 602 { "Courier New", 22, "Regular", '2' }, 603 { "Courier New", 23, "Regular", '2' }, 604 { "Courier New", 24, "Regular", '2' }, 605 }; 606 607 608 #ifndef FORCE_NATURAL_WIDTHS 609 610 /* Use compatible widths with these glyphs. Compatible widths is always */ 611 /* on when doing B/W TrueType instructing, but is used selectively here, */ 612 /* typically on glyphs with 3 or more vertical stems. */ 613 #define COMPATIBLE_WIDTHS_RULES_SIZE 38 614 615 static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules 616 [COMPATIBLE_WIDTHS_RULES_SIZE] = 617 { 618 { "Arial Unicode MS", 12, "Regular Class", 'm' }, 619 { "Arial Unicode MS", 14, "Regular Class", 'm' }, 620 /* Cyrillic small letter sha */ 621 { "Arial", 10, "Regular Class", 0x448 }, 622 { "Arial", 11, "Regular Class", 'm' }, 623 { "Arial", 12, "Regular Class", 'm' }, 624 /* Cyrillic small letter sha */ 625 { "Arial", 12, "Regular Class", 0x448 }, 626 { "Arial", 13, "Regular Class", 0x448 }, 627 { "Arial", 14, "Regular Class", 'm' }, 628 /* Cyrillic small letter sha */ 629 { "Arial", 14, "Regular Class", 0x448 }, 630 { "Arial", 15, "Regular Class", 0x448 }, 631 { "Arial", 17, "Regular Class", 'm' }, 632 { "DejaVu Sans", 15, "Regular Class", 0 }, 633 { "Microsoft Sans Serif", 11, "Regular Class", 0 }, 634 { "Microsoft Sans Serif", 12, "Regular Class", 0 }, 635 { "Segoe UI", 11, "Regular Class", 0 }, 636 { "Monaco", 0, "Regular Class", 0 }, 637 { "Segoe UI", 12, "Regular Class", 'm' }, 638 { "Segoe UI", 14, "Regular Class", 'm' }, 639 { "Tahoma", 11, "Regular Class", 0 }, 640 { "Times New Roman", 16, "Regular Class", 'c' }, 641 { "Times New Roman", 16, "Regular Class", 'm' }, 642 { "Times New Roman", 16, "Regular Class", 'o' }, 643 { "Times New Roman", 16, "Regular Class", 'w' }, 644 { "Trebuchet MS", 11, "Regular Class", 0 }, 645 { "Trebuchet MS", 12, "Regular Class", 0 }, 646 { "Trebuchet MS", 14, "Regular Class", 0 }, 647 { "Trebuchet MS", 15, "Regular Class", 0 }, 648 { "Ubuntu", 12, "Regular Class", 'm' }, 649 /* Cyrillic small letter sha */ 650 { "Verdana", 10, "Regular Class", 0x448 }, 651 { "Verdana", 11, "Regular Class", 0x448 }, 652 { "Verdana and Clones", 12, "Regular Class", 'i' }, 653 { "Verdana and Clones", 12, "Regular Class", 'j' }, 654 { "Verdana and Clones", 12, "Regular Class", 'l' }, 655 { "Verdana and Clones", 12, "Regular Class", 'm' }, 656 { "Verdana and Clones", 13, "Regular Class", 'i' }, 657 { "Verdana and Clones", 13, "Regular Class", 'j' }, 658 { "Verdana and Clones", 13, "Regular Class", 'l' }, 659 { "Verdana and Clones", 14, "Regular Class", 'm' }, 660 }; 661 662 663 /* Scaling slightly in the x-direction prior to hinting results in */ 664 /* more visually pleasing glyphs in certain cases. */ 665 /* This sometimes needs to be coordinated with compatible width rules. */ 666 /* A value of 1000 corresponds to a scaled value of 1.0. */ 667 668 #define X_SCALING_RULES_SIZE 50 669 670 static const SPH_ScaleRule X_SCALING_Rules[X_SCALING_RULES_SIZE] = 671 { 672 { "DejaVu Sans", 12, "Regular Class", 'm', 950 }, 673 { "Verdana and Clones", 12, "Regular Class", 'a', 1100 }, 674 { "Verdana and Clones", 13, "Regular Class", 'a', 1050 }, 675 { "Arial", 11, "Regular Class", 'm', 975 }, 676 { "Arial", 12, "Regular Class", 'm', 1050 }, 677 /* Cyrillic small letter el */ 678 { "Arial", 13, "Regular Class", 0x43B, 950 }, 679 { "Arial", 13, "Regular Class", 'o', 950 }, 680 { "Arial", 13, "Regular Class", 'e', 950 }, 681 { "Arial", 14, "Regular Class", 'm', 950 }, 682 /* Cyrillic small letter el */ 683 { "Arial", 15, "Regular Class", 0x43B, 925 }, 684 { "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 }, 685 { "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 }, 686 { "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 }, 687 { "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 }, 688 { "DejaVu Sans", 12, "Regular Class", 'l', 975 }, 689 { "DejaVu Sans", 12, "Regular Class", 'i', 975 }, 690 { "DejaVu Sans", 12, "Regular Class", 'j', 975 }, 691 { "DejaVu Sans", 13, "Regular Class", 'l', 950 }, 692 { "DejaVu Sans", 13, "Regular Class", 'i', 950 }, 693 { "DejaVu Sans", 13, "Regular Class", 'j', 950 }, 694 { "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 }, 695 { "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 }, 696 { "Georgia", 10, "", 0, 1050 }, 697 { "Georgia", 11, "", 0, 1100 }, 698 { "Georgia", 12, "", 0, 1025 }, 699 { "Georgia", 13, "", 0, 1050 }, 700 { "Georgia", 16, "", 0, 1050 }, 701 { "Georgia", 17, "", 0, 1030 }, 702 { "Liberation Sans", 12, "Regular Class", 'm', 1100 }, 703 { "Lucida Grande", 11, "Regular Class", 'm', 1100 }, 704 { "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 }, 705 { "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 }, 706 { "Segoe UI", 12, "Regular Class", 'H', 1050 }, 707 { "Segoe UI", 12, "Regular Class", 'm', 1050 }, 708 { "Segoe UI", 14, "Regular Class", 'm', 1050 }, 709 { "Tahoma", 11, "Regular Class", 'i', 975 }, 710 { "Tahoma", 11, "Regular Class", 'l', 975 }, 711 { "Tahoma", 11, "Regular Class", 'j', 900 }, 712 { "Tahoma", 11, "Regular Class", 'm', 918 }, 713 { "Verdana", 10, "Regular/Italic Class", 0, 1100 }, 714 { "Verdana", 12, "Regular Class", 'm', 975 }, 715 { "Verdana", 12, "Regular/Italic Class", 0, 1050 }, 716 { "Verdana", 13, "Regular/Italic Class", 'i', 950 }, 717 { "Verdana", 13, "Regular/Italic Class", 'j', 950 }, 718 { "Verdana", 13, "Regular/Italic Class", 'l', 950 }, 719 { "Verdana", 16, "Regular Class", 0, 1050 }, 720 { "Verdana", 9, "Regular/Italic Class", 0, 1050 }, 721 { "Times New Roman", 16, "Regular Class", 'm', 918 }, 722 { "Trebuchet MS", 11, "Regular Class", 'm', 800 }, 723 { "Trebuchet MS", 12, "Regular Class", 'm', 800 }, 724 }; 725 726 #else 727 728 #define COMPATIBLE_WIDTHS_RULES_SIZE 1 729 730 static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules 731 [COMPATIBLE_WIDTHS_RULES_SIZE] = 732 { 733 { "-", 0, "", 0 }, 734 }; 735 736 737 #define X_SCALING_RULES_SIZE 1 738 739 static const SPH_ScaleRule X_SCALING_Rules 740 [X_SCALING_RULES_SIZE] = 741 { 742 { "-", 0, "", 0, 1000 }, 743 }; 744 745 #endif /* FORCE_NATURAL_WIDTHS */ 746 747 748 static FT_Bool 749 is_member_of_family_class( const FT_String* detected_font_name, 750 const FT_String* rule_font_name ) 751 { 752 FT_UInt i, j; 753 754 755 /* Does font name match rule family? */ 756 if ( ft_strcmp( detected_font_name, rule_font_name ) == 0 ) 757 return TRUE; 758 759 /* Is font name a wildcard ""? */ 760 if ( ft_strcmp( rule_font_name, "" ) == 0 ) 761 return TRUE; 762 763 /* Is font name contained in a class list? */ 764 for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ ) 765 { 766 if ( ft_strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 ) 767 { 768 for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) 769 { 770 if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 ) 771 continue; 772 if ( ft_strcmp( FAMILY_CLASS_Rules[i].member[j], 773 detected_font_name ) == 0 ) 774 return TRUE; 775 } 776 } 777 } 778 779 return FALSE; 780 } 781 782 783 static FT_Bool 784 is_member_of_style_class( const FT_String* detected_font_style, 785 const FT_String* rule_font_style ) 786 { 787 FT_UInt i, j; 788 789 790 /* Does font style match rule style? */ 791 if ( ft_strcmp( detected_font_style, rule_font_style ) == 0 ) 792 return TRUE; 793 794 /* Is font style a wildcard ""? */ 795 if ( ft_strcmp( rule_font_style, "" ) == 0 ) 796 return TRUE; 797 798 /* Is font style contained in a class list? */ 799 for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ ) 800 { 801 if ( ft_strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 ) 802 { 803 for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ ) 804 { 805 if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 ) 806 continue; 807 if ( ft_strcmp( STYLE_CLASS_Rules[i].member[j], 808 detected_font_style ) == 0 ) 809 return TRUE; 810 } 811 } 812 } 813 814 return FALSE; 815 } 816 817 818 FT_LOCAL_DEF( FT_Bool ) 819 sph_test_tweak( TT_Face face, 820 const FT_String* family, 821 FT_UInt ppem, 822 const FT_String* style, 823 FT_UInt glyph_index, 824 const SPH_TweakRule* rule, 825 FT_UInt num_rules ) 826 { 827 FT_UInt i; 828 829 830 /* rule checks may be able to be optimized further */ 831 for ( i = 0; i < num_rules; i++ ) 832 { 833 if ( family && 834 ( is_member_of_family_class ( family, rule[i].family ) ) ) 835 if ( rule[i].ppem == 0 || 836 rule[i].ppem == ppem ) 837 if ( style && 838 is_member_of_style_class ( style, rule[i].style ) ) 839 if ( rule[i].glyph == 0 || 840 FT_Get_Char_Index( (FT_Face)face, 841 rule[i].glyph ) == glyph_index ) 842 return TRUE; 843 } 844 845 return FALSE; 846 } 847 848 849 static FT_UInt 850 scale_test_tweak( TT_Face face, 851 const FT_String* family, 852 FT_UInt ppem, 853 const FT_String* style, 854 FT_UInt glyph_index, 855 const SPH_ScaleRule* rule, 856 FT_UInt num_rules ) 857 { 858 FT_UInt i; 859 860 861 /* rule checks may be able to be optimized further */ 862 for ( i = 0; i < num_rules; i++ ) 863 { 864 if ( family && 865 ( is_member_of_family_class ( family, rule[i].family ) ) ) 866 if ( rule[i].ppem == 0 || 867 rule[i].ppem == ppem ) 868 if ( style && 869 is_member_of_style_class( style, rule[i].style ) ) 870 if ( rule[i].glyph == 0 || 871 FT_Get_Char_Index( (FT_Face)face, 872 rule[i].glyph ) == glyph_index ) 873 return rule[i].scale; 874 } 875 876 return 1000; 877 } 878 879 880 FT_LOCAL_DEF( FT_UInt ) 881 sph_test_tweak_x_scaling( TT_Face face, 882 const FT_String* family, 883 FT_UInt ppem, 884 const FT_String* style, 885 FT_UInt glyph_index ) 886 { 887 return scale_test_tweak( face, family, ppem, style, glyph_index, 888 X_SCALING_Rules, X_SCALING_RULES_SIZE ); 889 } 890 891 892 #define TWEAK_RULES( x ) \ 893 if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ 894 x##_Rules, x##_RULES_SIZE ) ) \ 895 loader->exec->sph_tweak_flags |= SPH_TWEAK_##x; 896 897 #define TWEAK_RULES_EXCEPTIONS( x ) \ 898 if ( sph_test_tweak( face, family, ppem, style, glyph_index, \ 899 x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \ 900 loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x; 901 902 903 FT_LOCAL_DEF( void ) 904 sph_set_tweaks( TT_Loader loader, 905 FT_UInt glyph_index ) 906 { 907 TT_Face face = loader->face; 908 FT_String* family = face->root.family_name; 909 FT_UInt ppem = loader->size->metrics->x_ppem; 910 FT_String* style = face->root.style_name; 911 912 913 /* don't apply rules if style isn't set */ 914 if ( !face->root.style_name ) 915 return; 916 917 #ifdef SPH_DEBUG_MORE_VERBOSE 918 printf( "%s,%d,%s,%c=%d ", 919 family, ppem, style, glyph_index, glyph_index ); 920 #endif 921 922 TWEAK_RULES( PIXEL_HINTING ); 923 924 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING ) 925 { 926 loader->exec->ignore_x_mode = FALSE; 927 return; 928 } 929 930 TWEAK_RULES( ALLOW_X_DMOVE ); 931 TWEAK_RULES( ALWAYS_DO_DELTAP ); 932 TWEAK_RULES( ALWAYS_SKIP_DELTAP ); 933 TWEAK_RULES( DEEMBOLDEN ); 934 TWEAK_RULES( DO_SHPIX ); 935 TWEAK_RULES( EMBOLDEN ); 936 TWEAK_RULES( MIAP_HACK ); 937 TWEAK_RULES( NORMAL_ROUND ); 938 TWEAK_RULES( NO_ALIGNRP_AFTER_IUP ); 939 TWEAK_RULES( NO_CALL_AFTER_IUP ); 940 TWEAK_RULES( NO_DELTAP_AFTER_IUP ); 941 TWEAK_RULES( RASTERIZER_35 ); 942 TWEAK_RULES( SKIP_IUP ); 943 944 TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES ); 945 TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES ); 946 947 TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES_DELTAP ); 948 949 TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES ); 950 TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES ); 951 952 TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES ); 953 TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES ); 954 955 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 ) 956 { 957 if ( loader->exec->rasterizer_version != TT_INTERPRETER_VERSION_35 ) 958 { 959 loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 960 loader->exec->size->cvt_ready = -1; 961 962 tt_size_ready_bytecode( 963 loader->exec->size, 964 FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); 965 } 966 else 967 loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35; 968 } 969 else 970 { 971 if ( loader->exec->rasterizer_version != 972 SPH_OPTION_SET_RASTERIZER_VERSION ) 973 { 974 loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 975 loader->exec->size->cvt_ready = -1; 976 977 tt_size_ready_bytecode( 978 loader->exec->size, 979 FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) ); 980 } 981 else 982 loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION; 983 } 984 985 if ( IS_HINTED( loader->load_flags ) ) 986 { 987 TWEAK_RULES( TIMES_NEW_ROMAN_HACK ); 988 TWEAK_RULES( COURIER_NEW_2_HACK ); 989 } 990 991 if ( sph_test_tweak( face, family, ppem, style, glyph_index, 992 COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) ) 993 loader->exec->face->sph_compatibility_mode = TRUE; 994 995 996 if ( IS_HINTED( loader->load_flags ) ) 997 { 998 if ( sph_test_tweak( face, family, ppem, style, glyph_index, 999 COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) ) 1000 loader->exec->compatible_widths |= TRUE; 1001 } 1002 } 1003 1004 #else /* !(TT_USE_BYTECODE_INTERPRETER && */ 1005 /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */ 1006 1007 /* ANSI C doesn't like empty source files */ 1008 typedef int _tt_subpix_dummy; 1009 1010 #endif /* !(TT_USE_BYTECODE_INTERPRETER && */ 1011 /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY) */ 1012 1013 1014 /* END */ 1015
