1 /**************************************************************************** 2 * 3 * t1driver.c 4 * 5 * Type 1 driver interface (body). 6 * 7 * Copyright (C) 1996-2020 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 19 #include "t1driver.h" 20 #include "t1gload.h" 21 #include "t1load.h" 22 23 #include "t1errors.h" 24 25 #ifndef T1_CONFIG_OPTION_NO_AFM 26 #include "t1afm.h" 27 #endif 28 29 #include <freetype/internal/ftdebug.h> 30 #include <freetype/internal/ftstream.h> 31 #include <freetype/internal/fthash.h> 32 #include <freetype/internal/ftpsprop.h> 33 #include <freetype/ftdriver.h> 34 35 #include <freetype/internal/services/svmm.h> 36 #include <freetype/internal/services/svgldict.h> 37 #include <freetype/internal/services/svfntfmt.h> 38 #include <freetype/internal/services/svpostnm.h> 39 #include <freetype/internal/services/svpscmap.h> 40 #include <freetype/internal/services/svpsinfo.h> 41 #include <freetype/internal/services/svprop.h> 42 #include <freetype/internal/services/svkern.h> 43 44 45 /************************************************************************** 46 * 47 * The macro FT_COMPONENT is used in trace mode. It is an implicit 48 * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log 49 * messages during execution. 50 */ 51 #undef FT_COMPONENT 52 #define FT_COMPONENT t1driver 53 54 /* 55 * GLYPH DICT SERVICE 56 * 57 */ 58 59 static FT_Error t1_get_glyph_name(T1_Face face,FT_UInt glyph_index,FT_Pointer buffer,FT_UInt buffer_max)60 t1_get_glyph_name( T1_Face face, 61 FT_UInt glyph_index, 62 FT_Pointer buffer, 63 FT_UInt buffer_max ) 64 { 65 FT_STRCPYN( buffer, face->type1.glyph_names[glyph_index], buffer_max ); 66 67 return FT_Err_Ok; 68 } 69 70 71 static FT_UInt t1_get_name_index(T1_Face face,const FT_String * glyph_name)72 t1_get_name_index( T1_Face face, 73 const FT_String* glyph_name ) 74 { 75 FT_Int i; 76 77 78 for ( i = 0; i < face->type1.num_glyphs; i++ ) 79 { 80 FT_String* gname = face->type1.glyph_names[i]; 81 82 83 if ( !ft_strcmp( glyph_name, gname ) ) 84 return (FT_UInt)i; 85 } 86 87 return 0; 88 } 89 90 91 static const FT_Service_GlyphDictRec t1_service_glyph_dict = 92 { 93 (FT_GlyphDict_GetNameFunc) t1_get_glyph_name, /* get_name */ 94 (FT_GlyphDict_NameIndexFunc)t1_get_name_index /* name_index */ 95 }; 96 97 98 /* 99 * POSTSCRIPT NAME SERVICE 100 * 101 */ 102 103 static const char* t1_get_ps_name(T1_Face face)104 t1_get_ps_name( T1_Face face ) 105 { 106 return (const char*) face->type1.font_name; 107 } 108 109 110 static const FT_Service_PsFontNameRec t1_service_ps_name = 111 { 112 (FT_PsName_GetFunc)t1_get_ps_name /* get_ps_font_name */ 113 }; 114 115 116 /* 117 * MULTIPLE MASTERS SERVICE 118 * 119 */ 120 121 #ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT 122 static const FT_Service_MultiMastersRec t1_service_multi_masters = 123 { 124 (FT_Get_MM_Func) T1_Get_Multi_Master, /* get_mm */ 125 (FT_Set_MM_Design_Func) T1_Set_MM_Design, /* set_mm_design */ 126 (FT_Set_MM_Blend_Func) T1_Set_MM_Blend, /* set_mm_blend */ 127 (FT_Get_MM_Blend_Func) T1_Get_MM_Blend, /* get_mm_blend */ 128 (FT_Get_MM_Var_Func) T1_Get_MM_Var, /* get_mm_var */ 129 (FT_Set_Var_Design_Func) T1_Set_Var_Design, /* set_var_design */ 130 (FT_Get_Var_Design_Func) T1_Get_Var_Design, /* get_var_design */ 131 (FT_Set_Instance_Func) T1_Reset_MM_Blend, /* set_instance */ 132 (FT_Set_MM_WeightVector_Func)T1_Set_MM_WeightVector, /* set_mm_weightvector */ 133 (FT_Get_MM_WeightVector_Func)T1_Get_MM_WeightVector, /* get_mm_weightvector */ 134 135 (FT_Get_Var_Blend_Func) NULL, /* get_var_blend */ 136 (FT_Done_Blend_Func) T1_Done_Blend /* done_blend */ 137 }; 138 #endif 139 140 141 /* 142 * POSTSCRIPT INFO SERVICE 143 * 144 */ 145 146 static FT_Error t1_ps_get_font_info(FT_Face face,PS_FontInfoRec * afont_info)147 t1_ps_get_font_info( FT_Face face, 148 PS_FontInfoRec* afont_info ) 149 { 150 *afont_info = ((T1_Face)face)->type1.font_info; 151 152 return FT_Err_Ok; 153 } 154 155 156 static FT_Error t1_ps_get_font_extra(FT_Face face,PS_FontExtraRec * afont_extra)157 t1_ps_get_font_extra( FT_Face face, 158 PS_FontExtraRec* afont_extra ) 159 { 160 *afont_extra = ((T1_Face)face)->type1.font_extra; 161 162 return FT_Err_Ok; 163 } 164 165 166 static FT_Int t1_ps_has_glyph_names(FT_Face face)167 t1_ps_has_glyph_names( FT_Face face ) 168 { 169 FT_UNUSED( face ); 170 171 return 1; 172 } 173 174 175 static FT_Error t1_ps_get_font_private(FT_Face face,PS_PrivateRec * afont_private)176 t1_ps_get_font_private( FT_Face face, 177 PS_PrivateRec* afont_private ) 178 { 179 *afont_private = ((T1_Face)face)->type1.private_dict; 180 181 return FT_Err_Ok; 182 } 183 184 185 static FT_Long t1_ps_get_font_value(FT_Face face,PS_Dict_Keys key,FT_UInt idx,void * value,FT_Long value_len_)186 t1_ps_get_font_value( FT_Face face, 187 PS_Dict_Keys key, 188 FT_UInt idx, 189 void *value, 190 FT_Long value_len_ ) 191 { 192 FT_ULong retval = 0; /* always >= 1 if valid */ 193 FT_ULong value_len = value_len_ < 0 ? 0 : (FT_ULong)value_len_; 194 195 T1_Face t1face = (T1_Face)face; 196 T1_Font type1 = &t1face->type1; 197 198 199 switch ( key ) 200 { 201 case PS_DICT_FONT_TYPE: 202 retval = sizeof ( type1->font_type ); 203 if ( value && value_len >= retval ) 204 *((FT_Byte *)value) = type1->font_type; 205 break; 206 207 case PS_DICT_FONT_MATRIX: 208 if ( idx < sizeof ( type1->font_matrix ) / 209 sizeof ( type1->font_matrix.xx ) ) 210 { 211 FT_Fixed val = 0; 212 213 214 retval = sizeof ( val ); 215 if ( value && value_len >= retval ) 216 { 217 switch ( idx ) 218 { 219 case 0: 220 val = type1->font_matrix.xx; 221 break; 222 case 1: 223 val = type1->font_matrix.xy; 224 break; 225 case 2: 226 val = type1->font_matrix.yx; 227 break; 228 case 3: 229 val = type1->font_matrix.yy; 230 break; 231 } 232 *((FT_Fixed *)value) = val; 233 } 234 } 235 break; 236 237 case PS_DICT_FONT_BBOX: 238 if ( idx < sizeof ( type1->font_bbox ) / 239 sizeof ( type1->font_bbox.xMin ) ) 240 { 241 FT_Fixed val = 0; 242 243 244 retval = sizeof ( val ); 245 if ( value && value_len >= retval ) 246 { 247 switch ( idx ) 248 { 249 case 0: 250 val = type1->font_bbox.xMin; 251 break; 252 case 1: 253 val = type1->font_bbox.yMin; 254 break; 255 case 2: 256 val = type1->font_bbox.xMax; 257 break; 258 case 3: 259 val = type1->font_bbox.yMax; 260 break; 261 } 262 *((FT_Fixed *)value) = val; 263 } 264 } 265 break; 266 267 case PS_DICT_PAINT_TYPE: 268 retval = sizeof ( type1->paint_type ); 269 if ( value && value_len >= retval ) 270 *((FT_Byte *)value) = type1->paint_type; 271 break; 272 273 case PS_DICT_FONT_NAME: 274 if ( type1->font_name ) 275 { 276 retval = ft_strlen( type1->font_name ) + 1; 277 if ( value && value_len >= retval ) 278 ft_memcpy( value, (void *)( type1->font_name ), retval ); 279 } 280 break; 281 282 case PS_DICT_UNIQUE_ID: 283 retval = sizeof ( type1->private_dict.unique_id ); 284 if ( value && value_len >= retval ) 285 *((FT_Int *)value) = type1->private_dict.unique_id; 286 break; 287 288 case PS_DICT_NUM_CHAR_STRINGS: 289 retval = sizeof ( type1->num_glyphs ); 290 if ( value && value_len >= retval ) 291 *((FT_Int *)value) = type1->num_glyphs; 292 break; 293 294 case PS_DICT_CHAR_STRING_KEY: 295 if ( idx < (FT_UInt)type1->num_glyphs ) 296 { 297 retval = ft_strlen( type1->glyph_names[idx] ) + 1; 298 if ( value && value_len >= retval ) 299 { 300 ft_memcpy( value, (void *)( type1->glyph_names[idx] ), retval ); 301 ((FT_Char *)value)[retval - 1] = (FT_Char)'\0'; 302 } 303 } 304 break; 305 306 case PS_DICT_CHAR_STRING: 307 if ( idx < (FT_UInt)type1->num_glyphs ) 308 { 309 retval = type1->charstrings_len[idx] + 1; 310 if ( value && value_len >= retval ) 311 { 312 ft_memcpy( value, (void *)( type1->charstrings[idx] ), 313 retval - 1 ); 314 ((FT_Char *)value)[retval - 1] = (FT_Char)'\0'; 315 } 316 } 317 break; 318 319 case PS_DICT_ENCODING_TYPE: 320 retval = sizeof ( type1->encoding_type ); 321 if ( value && value_len >= retval ) 322 *((T1_EncodingType *)value) = type1->encoding_type; 323 break; 324 325 case PS_DICT_ENCODING_ENTRY: 326 if ( type1->encoding_type == T1_ENCODING_TYPE_ARRAY && 327 idx < (FT_UInt)type1->encoding.num_chars ) 328 { 329 retval = ft_strlen( type1->encoding.char_name[idx] ) + 1; 330 if ( value && value_len >= retval ) 331 { 332 ft_memcpy( value, (void *)( type1->encoding.char_name[idx] ), 333 retval - 1 ); 334 ((FT_Char *)value)[retval - 1] = (FT_Char)'\0'; 335 } 336 } 337 break; 338 339 case PS_DICT_NUM_SUBRS: 340 retval = sizeof ( type1->num_subrs ); 341 if ( value && value_len >= retval ) 342 *((FT_Int *)value) = type1->num_subrs; 343 break; 344 345 case PS_DICT_SUBR: 346 { 347 FT_Bool ok = 0; 348 349 350 if ( type1->subrs_hash ) 351 { 352 /* convert subr index to array index */ 353 size_t* val = ft_hash_num_lookup( (FT_Int)idx, 354 type1->subrs_hash ); 355 356 357 if ( val ) 358 { 359 idx = *val; 360 ok = 1; 361 } 362 } 363 else 364 { 365 if ( idx < (FT_UInt)type1->num_subrs ) 366 ok = 1; 367 } 368 369 if ( ok && type1->subrs ) 370 { 371 retval = type1->subrs_len[idx] + 1; 372 if ( value && value_len >= retval ) 373 { 374 ft_memcpy( value, (void *)( type1->subrs[idx] ), retval - 1 ); 375 ((FT_Char *)value)[retval - 1] = (FT_Char)'\0'; 376 } 377 } 378 } 379 break; 380 381 case PS_DICT_STD_HW: 382 retval = sizeof ( type1->private_dict.standard_width[0] ); 383 if ( value && value_len >= retval ) 384 *((FT_UShort *)value) = type1->private_dict.standard_width[0]; 385 break; 386 387 case PS_DICT_STD_VW: 388 retval = sizeof ( type1->private_dict.standard_height[0] ); 389 if ( value && value_len >= retval ) 390 *((FT_UShort *)value) = type1->private_dict.standard_height[0]; 391 break; 392 393 case PS_DICT_NUM_BLUE_VALUES: 394 retval = sizeof ( type1->private_dict.num_blue_values ); 395 if ( value && value_len >= retval ) 396 *((FT_Byte *)value) = type1->private_dict.num_blue_values; 397 break; 398 399 case PS_DICT_BLUE_VALUE: 400 if ( idx < type1->private_dict.num_blue_values ) 401 { 402 retval = sizeof ( type1->private_dict.blue_values[idx] ); 403 if ( value && value_len >= retval ) 404 *((FT_Short *)value) = type1->private_dict.blue_values[idx]; 405 } 406 break; 407 408 case PS_DICT_BLUE_SCALE: 409 retval = sizeof ( type1->private_dict.blue_scale ); 410 if ( value && value_len >= retval ) 411 *((FT_Fixed *)value) = type1->private_dict.blue_scale; 412 break; 413 414 case PS_DICT_BLUE_FUZZ: 415 retval = sizeof ( type1->private_dict.blue_fuzz ); 416 if ( value && value_len >= retval ) 417 *((FT_Int *)value) = type1->private_dict.blue_fuzz; 418 break; 419 420 case PS_DICT_BLUE_SHIFT: 421 retval = sizeof ( type1->private_dict.blue_shift ); 422 if ( value && value_len >= retval ) 423 *((FT_Int *)value) = type1->private_dict.blue_shift; 424 break; 425 426 case PS_DICT_NUM_OTHER_BLUES: 427 retval = sizeof ( type1->private_dict.num_other_blues ); 428 if ( value && value_len >= retval ) 429 *((FT_Byte *)value) = type1->private_dict.num_other_blues; 430 break; 431 432 case PS_DICT_OTHER_BLUE: 433 if ( idx < type1->private_dict.num_other_blues ) 434 { 435 retval = sizeof ( type1->private_dict.other_blues[idx] ); 436 if ( value && value_len >= retval ) 437 *((FT_Short *)value) = type1->private_dict.other_blues[idx]; 438 } 439 break; 440 441 case PS_DICT_NUM_FAMILY_BLUES: 442 retval = sizeof ( type1->private_dict.num_family_blues ); 443 if ( value && value_len >= retval ) 444 *((FT_Byte *)value) = type1->private_dict.num_family_blues; 445 break; 446 447 case PS_DICT_FAMILY_BLUE: 448 if ( idx < type1->private_dict.num_family_blues ) 449 { 450 retval = sizeof ( type1->private_dict.family_blues[idx] ); 451 if ( value && value_len >= retval ) 452 *((FT_Short *)value) = type1->private_dict.family_blues[idx]; 453 } 454 break; 455 456 case PS_DICT_NUM_FAMILY_OTHER_BLUES: 457 retval = sizeof ( type1->private_dict.num_family_other_blues ); 458 if ( value && value_len >= retval ) 459 *((FT_Byte *)value) = type1->private_dict.num_family_other_blues; 460 break; 461 462 case PS_DICT_FAMILY_OTHER_BLUE: 463 if ( idx < type1->private_dict.num_family_other_blues ) 464 { 465 retval = sizeof ( type1->private_dict.family_other_blues[idx] ); 466 if ( value && value_len >= retval ) 467 *((FT_Short *)value) = type1->private_dict.family_other_blues[idx]; 468 } 469 break; 470 471 case PS_DICT_NUM_STEM_SNAP_H: 472 retval = sizeof ( type1->private_dict.num_snap_widths ); 473 if ( value && value_len >= retval ) 474 *((FT_Byte *)value) = type1->private_dict.num_snap_widths; 475 break; 476 477 case PS_DICT_STEM_SNAP_H: 478 if ( idx < type1->private_dict.num_snap_widths ) 479 { 480 retval = sizeof ( type1->private_dict.snap_widths[idx] ); 481 if ( value && value_len >= retval ) 482 *((FT_Short *)value) = type1->private_dict.snap_widths[idx]; 483 } 484 break; 485 486 case PS_DICT_NUM_STEM_SNAP_V: 487 retval = sizeof ( type1->private_dict.num_snap_heights ); 488 if ( value && value_len >= retval ) 489 *((FT_Byte *)value) = type1->private_dict.num_snap_heights; 490 break; 491 492 case PS_DICT_STEM_SNAP_V: 493 if ( idx < type1->private_dict.num_snap_heights ) 494 { 495 retval = sizeof ( type1->private_dict.snap_heights[idx] ); 496 if ( value && value_len >= retval ) 497 *((FT_Short *)value) = type1->private_dict.snap_heights[idx]; 498 } 499 break; 500 501 case PS_DICT_RND_STEM_UP: 502 retval = sizeof ( type1->private_dict.round_stem_up ); 503 if ( value && value_len >= retval ) 504 *((FT_Bool *)value) = type1->private_dict.round_stem_up; 505 break; 506 507 case PS_DICT_FORCE_BOLD: 508 retval = sizeof ( type1->private_dict.force_bold ); 509 if ( value && value_len >= retval ) 510 *((FT_Bool *)value) = type1->private_dict.force_bold; 511 break; 512 513 case PS_DICT_MIN_FEATURE: 514 if ( idx < sizeof ( type1->private_dict.min_feature ) / 515 sizeof ( type1->private_dict.min_feature[0] ) ) 516 { 517 retval = sizeof ( type1->private_dict.min_feature[idx] ); 518 if ( value && value_len >= retval ) 519 *((FT_Short *)value) = type1->private_dict.min_feature[idx]; 520 } 521 break; 522 523 case PS_DICT_LEN_IV: 524 retval = sizeof ( type1->private_dict.lenIV ); 525 if ( value && value_len >= retval ) 526 *((FT_Int *)value) = type1->private_dict.lenIV; 527 break; 528 529 case PS_DICT_PASSWORD: 530 retval = sizeof ( type1->private_dict.password ); 531 if ( value && value_len >= retval ) 532 *((FT_Long *)value) = type1->private_dict.password; 533 break; 534 535 case PS_DICT_LANGUAGE_GROUP: 536 retval = sizeof ( type1->private_dict.language_group ); 537 if ( value && value_len >= retval ) 538 *((FT_Long *)value) = type1->private_dict.language_group; 539 break; 540 541 case PS_DICT_IS_FIXED_PITCH: 542 retval = sizeof ( type1->font_info.is_fixed_pitch ); 543 if ( value && value_len >= retval ) 544 *((FT_Bool *)value) = type1->font_info.is_fixed_pitch; 545 break; 546 547 case PS_DICT_UNDERLINE_POSITION: 548 retval = sizeof ( type1->font_info.underline_position ); 549 if ( value && value_len >= retval ) 550 *((FT_Short *)value) = type1->font_info.underline_position; 551 break; 552 553 case PS_DICT_UNDERLINE_THICKNESS: 554 retval = sizeof ( type1->font_info.underline_thickness ); 555 if ( value && value_len >= retval ) 556 *((FT_UShort *)value) = type1->font_info.underline_thickness; 557 break; 558 559 case PS_DICT_FS_TYPE: 560 retval = sizeof ( type1->font_extra.fs_type ); 561 if ( value && value_len >= retval ) 562 *((FT_UShort *)value) = type1->font_extra.fs_type; 563 break; 564 565 case PS_DICT_VERSION: 566 if ( type1->font_info.version ) 567 { 568 retval = ft_strlen( type1->font_info.version ) + 1; 569 if ( value && value_len >= retval ) 570 ft_memcpy( value, (void *)( type1->font_info.version ), retval ); 571 } 572 break; 573 574 case PS_DICT_NOTICE: 575 if ( type1->font_info.notice ) 576 { 577 retval = ft_strlen( type1->font_info.notice ) + 1; 578 if ( value && value_len >= retval ) 579 ft_memcpy( value, (void *)( type1->font_info.notice ), retval ); 580 } 581 break; 582 583 case PS_DICT_FULL_NAME: 584 if ( type1->font_info.full_name ) 585 { 586 retval = ft_strlen( type1->font_info.full_name ) + 1; 587 if ( value && value_len >= retval ) 588 ft_memcpy( value, (void *)( type1->font_info.full_name ), retval ); 589 } 590 break; 591 592 case PS_DICT_FAMILY_NAME: 593 if ( type1->font_info.family_name ) 594 { 595 retval = ft_strlen( type1->font_info.family_name ) + 1; 596 if ( value && value_len >= retval ) 597 ft_memcpy( value, (void *)( type1->font_info.family_name ), 598 retval ); 599 } 600 break; 601 602 case PS_DICT_WEIGHT: 603 if ( type1->font_info.weight ) 604 { 605 retval = ft_strlen( type1->font_info.weight ) + 1; 606 if ( value && value_len >= retval ) 607 ft_memcpy( value, (void *)( type1->font_info.weight ), retval ); 608 } 609 break; 610 611 case PS_DICT_ITALIC_ANGLE: 612 retval = sizeof ( type1->font_info.italic_angle ); 613 if ( value && value_len >= retval ) 614 *((FT_Long *)value) = type1->font_info.italic_angle; 615 break; 616 } 617 618 return retval == 0 ? -1 : (FT_Long)retval; 619 } 620 621 622 static const FT_Service_PsInfoRec t1_service_ps_info = 623 { 624 (PS_GetFontInfoFunc) t1_ps_get_font_info, /* ps_get_font_info */ 625 (PS_GetFontExtraFunc) t1_ps_get_font_extra, /* ps_get_font_extra */ 626 (PS_HasGlyphNamesFunc) t1_ps_has_glyph_names, /* ps_has_glyph_names */ 627 (PS_GetFontPrivateFunc)t1_ps_get_font_private, /* ps_get_font_private */ 628 (PS_GetFontValueFunc) t1_ps_get_font_value, /* ps_get_font_value */ 629 }; 630 631 632 #ifndef T1_CONFIG_OPTION_NO_AFM 633 static const FT_Service_KerningRec t1_service_kerning = 634 { 635 T1_Get_Track_Kerning, /* get_track */ 636 }; 637 #endif 638 639 640 /* 641 * PROPERTY SERVICE 642 * 643 */ 644 645 FT_DEFINE_SERVICE_PROPERTIESREC( 646 t1_service_properties, 647 648 (FT_Properties_SetFunc)ps_property_set, /* set_property */ 649 (FT_Properties_GetFunc)ps_property_get ) /* get_property */ 650 651 652 /* 653 * SERVICE LIST 654 * 655 */ 656 657 static const FT_ServiceDescRec t1_services[] = 658 { 659 { FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &t1_service_ps_name }, 660 { FT_SERVICE_ID_GLYPH_DICT, &t1_service_glyph_dict }, 661 { FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TYPE_1 }, 662 { FT_SERVICE_ID_POSTSCRIPT_INFO, &t1_service_ps_info }, 663 { FT_SERVICE_ID_PROPERTIES, &t1_service_properties }, 664 665 #ifndef T1_CONFIG_OPTION_NO_AFM 666 { FT_SERVICE_ID_KERNING, &t1_service_kerning }, 667 #endif 668 669 #ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT 670 { FT_SERVICE_ID_MULTI_MASTERS, &t1_service_multi_masters }, 671 #endif 672 { NULL, NULL } 673 }; 674 675 676 FT_CALLBACK_DEF( FT_Module_Interface ) Get_Interface(FT_Module module,const FT_String * t1_interface)677 Get_Interface( FT_Module module, 678 const FT_String* t1_interface ) 679 { 680 FT_UNUSED( module ); 681 682 return ft_service_list_lookup( t1_services, t1_interface ); 683 } 684 685 686 #ifndef T1_CONFIG_OPTION_NO_AFM 687 688 /************************************************************************** 689 * 690 * @Function: 691 * Get_Kerning 692 * 693 * @Description: 694 * A driver method used to return the kerning vector between two 695 * glyphs of the same face. 696 * 697 * @Input: 698 * face :: 699 * A handle to the source face object. 700 * 701 * left_glyph :: 702 * The index of the left glyph in the kern pair. 703 * 704 * right_glyph :: 705 * The index of the right glyph in the kern pair. 706 * 707 * @Output: 708 * kerning :: 709 * The kerning vector. This is in font units for 710 * scalable formats, and in pixels for fixed-sizes 711 * formats. 712 * 713 * @Return: 714 * FreeType error code. 0 means success. 715 * 716 * @Note: 717 * Only horizontal layouts (left-to-right & right-to-left) are 718 * supported by this function. Other layouts, or more sophisticated 719 * kernings are out of scope of this method (the basic driver 720 * interface is meant to be simple). 721 * 722 * They can be implemented by format-specific interfaces. 723 */ 724 static FT_Error Get_Kerning(FT_Face t1face,FT_UInt left_glyph,FT_UInt right_glyph,FT_Vector * kerning)725 Get_Kerning( FT_Face t1face, /* T1_Face */ 726 FT_UInt left_glyph, 727 FT_UInt right_glyph, 728 FT_Vector* kerning ) 729 { 730 T1_Face face = (T1_Face)t1face; 731 732 733 kerning->x = 0; 734 kerning->y = 0; 735 736 if ( face->afm_data ) 737 T1_Get_Kerning( (AFM_FontInfo)face->afm_data, 738 left_glyph, 739 right_glyph, 740 kerning ); 741 742 return FT_Err_Ok; 743 } 744 745 746 #endif /* T1_CONFIG_OPTION_NO_AFM */ 747 748 749 FT_CALLBACK_TABLE_DEF 750 const FT_Driver_ClassRec t1_driver_class = 751 { 752 { 753 FT_MODULE_FONT_DRIVER | 754 FT_MODULE_DRIVER_SCALABLE | 755 FT_MODULE_DRIVER_HAS_HINTER, 756 757 sizeof ( PS_DriverRec ), 758 759 "type1", 760 0x10000L, 761 0x20000L, 762 763 NULL, /* module-specific interface */ 764 765 T1_Driver_Init, /* FT_Module_Constructor module_init */ 766 T1_Driver_Done, /* FT_Module_Destructor module_done */ 767 Get_Interface, /* FT_Module_Requester get_interface */ 768 }, 769 770 sizeof ( T1_FaceRec ), 771 sizeof ( T1_SizeRec ), 772 sizeof ( T1_GlyphSlotRec ), 773 774 T1_Face_Init, /* FT_Face_InitFunc init_face */ 775 T1_Face_Done, /* FT_Face_DoneFunc done_face */ 776 T1_Size_Init, /* FT_Size_InitFunc init_size */ 777 T1_Size_Done, /* FT_Size_DoneFunc done_size */ 778 T1_GlyphSlot_Init, /* FT_Slot_InitFunc init_slot */ 779 T1_GlyphSlot_Done, /* FT_Slot_DoneFunc done_slot */ 780 781 T1_Load_Glyph, /* FT_Slot_LoadFunc load_glyph */ 782 783 #ifdef T1_CONFIG_OPTION_NO_AFM 784 NULL, /* FT_Face_GetKerningFunc get_kerning */ 785 NULL, /* FT_Face_AttachFunc attach_file */ 786 #else 787 Get_Kerning, /* FT_Face_GetKerningFunc get_kerning */ 788 T1_Read_Metrics, /* FT_Face_AttachFunc attach_file */ 789 #endif 790 T1_Get_Advances, /* FT_Face_GetAdvancesFunc get_advances */ 791 792 T1_Size_Request, /* FT_Size_RequestFunc request_size */ 793 NULL /* FT_Size_SelectFunc select_size */ 794 }; 795 796 797 /* END */ 798