1 2<!doctype html> 3<html lang="en" class="no-js"> 4 <head> 5 6 <meta charset="utf-8"> 7 <meta name="viewport" content="width=device-width,initial-scale=1"> 8 9 <meta name="description" content="API Reference Documentation for FreeType-2.12.1"> 10 11 12 13 <meta name="author" content="FreeType Contributors"> 14 15 16 <link rel="icon" href="images/favico.ico"> 17 <meta name="generator" content="mkdocs-1.2.1, mkdocs-material-7.1.9"> 18 19 20 21 <title>External Debugging APIs - FreeType-2.12.1 API Reference</title> 22 23 24 25 <link rel="stylesheet" href="assets/stylesheets/main.ca7ac06f.min.css"> 26 27 28 <link rel="stylesheet" href="assets/stylesheets/palette.f1a3b89f.min.css"> 29 30 31 32 <meta name="theme-color" content="#4cae4f"> 33 34 35 36 37 38 39 40 <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> 41 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Noto+Serif:300,400,400i,700%7CRoboto+Mono&display=fallback"> 42 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class="md-header__inner md-grid" aria-label="Header"> 85 <a href="index.html" title="FreeType-2.12.1 API Reference" class="md-header__button md-logo" aria-label="FreeType-2.12.1 API Reference" data-md-component="logo"> 86 87 <img src="images/favico.ico" alt="logo"> 88 89 </a> 90 <label class="md-header__button md-icon" for="__drawer"> 91 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2z"/></svg> 92 </label> 93 <div class="md-header__title" data-md-component="header-title"> 94 <div class="md-header__ellipsis"> 95 <div class="md-header__topic"> 96 <span class="md-ellipsis"> 97 FreeType-2.12.1 API Reference 98 </span> 99 </div> 100 <div class="md-header__topic" data-md-component="header-topic"> 101 <span class="md-ellipsis"> 102 103 External Debugging APIs 104 105 </span> 106 </div> 107 </div> 108 </div> 109 110 111 112 <label class="md-header__button md-icon" for="__search"> 113 <svg xmlns="http://www.w3.org/2000/svg" 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data-md-component="container"> 147 148 149 150 151 <main class="md-main" data-md-component="main"> 152 <div class="md-main__inner md-grid"> 153 154 155 156 <div class="md-sidebar md-sidebar--primary" data-md-component="sidebar" data-md-type="navigation" > 157 <div class="md-sidebar__scrollwrap"> 158 <div class="md-sidebar__inner"> 159 160 161 162<nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0"> 163 <label class="md-nav__title" for="__drawer"> 164 <a href="index.html" title="FreeType-2.12.1 API Reference" class="md-nav__button md-logo" aria-label="FreeType-2.12.1 API Reference" data-md-component="logo"> 165 166 <img src="images/favico.ico" alt="logo"> 167 168 </a> 169 FreeType-2.12.1 API Reference 170 </label> 171 172 <ul class="md-nav__list" data-md-scrollfix> 173 174 175 176 177 178 179 180 181 <li class="md-nav__item"> 182 <a href="index.html" class="md-nav__link"> 183 TOC 184 </a> 185 </li> 186 187 188 189 190 191 192 193 194 195 196 <li class="md-nav__item"> 197 <a href="ft2-index.html" class="md-nav__link"> 198 Index 199 </a> 200 </li> 201 202 203 204 205 206 207 208 209 210 211 212 <li class="md-nav__item md-nav__item--nested"> 213 214 215 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_3" type="checkbox" id="__nav_3" > 216 217 <label class="md-nav__link" for="__nav_3"> 218 General Remarks 219 <span class="md-nav__icon md-icon"></span> 220 </label> 221 <nav class="md-nav" aria-label="General Remarks" data-md-level="1"> 222 <label class="md-nav__title" for="__nav_3"> 223 <span class="md-nav__icon md-icon"></span> 224 General Remarks 225 </label> 226 <ul class="md-nav__list" data-md-scrollfix> 227 228 229 230 231 232 <li class="md-nav__item"> 233 <a href="ft2-preamble.html" class="md-nav__link"> 234 Preamble 235 </a> 236 </li> 237 238 239 240 241 242 243 244 <li class="md-nav__item"> 245 <a href="ft2-header_inclusion.html" class="md-nav__link"> 246 FreeType's header inclusion scheme 247 </a> 248 </li> 249 250 251 252 253 254 255 256 <li class="md-nav__item"> 257 <a href="ft2-user_allocation.html" class="md-nav__link"> 258 User allocation 259 </a> 260 </li> 261 262 263 264 </ul> 265 </nav> 266 </li> 267 268 269 270 271 272 273 274 275 276 277 278 <li class="md-nav__item md-nav__item--nested"> 279 280 281 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_4" type="checkbox" id="__nav_4" > 282 283 <label class="md-nav__link" for="__nav_4"> 284 Core API 285 <span class="md-nav__icon md-icon"></span> 286 </label> 287 <nav class="md-nav" aria-label="Core API" data-md-level="1"> 288 <label class="md-nav__title" for="__nav_4"> 289 <span class="md-nav__icon md-icon"></span> 290 Core API 291 </label> 292 <ul class="md-nav__list" data-md-scrollfix> 293 294 295 296 297 298 <li class="md-nav__item"> 299 <a href="ft2-version.html" class="md-nav__link"> 300 FreeType Version 301 </a> 302 </li> 303 304 305 306 307 308 309 310 <li class="md-nav__item"> 311 <a href="ft2-basic_types.html" class="md-nav__link"> 312 Basic Data Types 313 </a> 314 </li> 315 316 317 318 319 320 321 322 <li class="md-nav__item"> 323 <a href="ft2-base_interface.html" class="md-nav__link"> 324 Base Interface 325 </a> 326 </li> 327 328 329 330 331 332 333 334 <li class="md-nav__item"> 335 <a href="ft2-glyph_variants.html" class="md-nav__link"> 336 Unicode Variation Sequences 337 </a> 338 </li> 339 340 341 342 343 344 345 346 <li class="md-nav__item"> 347 <a href="ft2-color_management.html" class="md-nav__link"> 348 Glyph Color Management 349 </a> 350 </li> 351 352 353 354 355 356 357 358 <li class="md-nav__item"> 359 <a href="ft2-layer_management.html" class="md-nav__link"> 360 Glyph Layer Management 361 </a> 362 </li> 363 364 365 366 367 368 369 370 <li class="md-nav__item"> 371 <a href="ft2-glyph_management.html" class="md-nav__link"> 372 Glyph Management 373 </a> 374 </li> 375 376 377 378 379 380 381 382 <li class="md-nav__item"> 383 <a href="ft2-mac_specific.html" class="md-nav__link"> 384 Mac Specific Interface 385 </a> 386 </li> 387 388 389 390 391 392 393 394 <li class="md-nav__item"> 395 <a href="ft2-sizes_management.html" class="md-nav__link"> 396 Size Management 397 </a> 398 </li> 399 400 401 402 403 404 405 406 <li class="md-nav__item"> 407 <a href="ft2-header_file_macros.html" class="md-nav__link"> 408 Header File Macros 409 </a> 410 </li> 411 412 413 414 </ul> 415 </nav> 416 </li> 417 418 419 420 421 422 423 424 425 426 427 428 <li class="md-nav__item md-nav__item--nested"> 429 430 431 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_5" type="checkbox" id="__nav_5" > 432 433 <label class="md-nav__link" for="__nav_5"> 434 Format-Specific API 435 <span class="md-nav__icon md-icon"></span> 436 </label> 437 <nav class="md-nav" aria-label="Format-Specific API" data-md-level="1"> 438 <label class="md-nav__title" for="__nav_5"> 439 <span class="md-nav__icon md-icon"></span> 440 Format-Specific API 441 </label> 442 <ul class="md-nav__list" data-md-scrollfix> 443 444 445 446 447 448 <li class="md-nav__item"> 449 <a href="ft2-multiple_masters.html" class="md-nav__link"> 450 Multiple Masters 451 </a> 452 </li> 453 454 455 456 457 458 459 460 <li class="md-nav__item"> 461 <a href="ft2-truetype_tables.html" class="md-nav__link"> 462 TrueType Tables 463 </a> 464 </li> 465 466 467 468 469 470 471 472 <li class="md-nav__item"> 473 <a href="ft2-type1_tables.html" class="md-nav__link"> 474 Type 1 Tables 475 </a> 476 </li> 477 478 479 480 481 482 483 484 <li class="md-nav__item"> 485 <a href="ft2-sfnt_names.html" class="md-nav__link"> 486 SFNT Names 487 </a> 488 </li> 489 490 491 492 493 494 495 496 <li class="md-nav__item"> 497 <a href="ft2-bdf_fonts.html" class="md-nav__link"> 498 BDF and PCF Files 499 </a> 500 </li> 501 502 503 504 505 506 507 508 <li class="md-nav__item"> 509 <a href="ft2-cid_fonts.html" class="md-nav__link"> 510 CID Fonts 511 </a> 512 </li> 513 514 515 516 517 518 519 520 <li class="md-nav__item"> 521 <a href="ft2-pfr_fonts.html" class="md-nav__link"> 522 PFR Fonts 523 </a> 524 </li> 525 526 527 528 529 530 531 532 <li class="md-nav__item"> 533 <a href="ft2-winfnt_fonts.html" class="md-nav__link"> 534 Window FNT Files 535 </a> 536 </li> 537 538 539 540 541 542 543 544 <li class="md-nav__item"> 545 <a href="ft2-svg_fonts.html" class="md-nav__link"> 546 OpenType SVG Fonts 547 </a> 548 </li> 549 550 551 552 553 554 555 556 <li class="md-nav__item"> 557 <a href="ft2-font_formats.html" class="md-nav__link"> 558 Font Formats 559 </a> 560 </li> 561 562 563 564 565 566 567 568 <li class="md-nav__item"> 569 <a href="ft2-gasp_table.html" class="md-nav__link"> 570 Gasp Table 571 </a> 572 </li> 573 574 575 576 </ul> 577 </nav> 578 </li> 579 580 581 582 583 584 585 586 587 588 589 590 <li class="md-nav__item md-nav__item--nested"> 591 592 593 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_6" type="checkbox" id="__nav_6" > 594 595 <label class="md-nav__link" for="__nav_6"> 596 Controlling FreeType Modules 597 <span class="md-nav__icon md-icon"></span> 598 </label> 599 <nav class="md-nav" aria-label="Controlling FreeType Modules" data-md-level="1"> 600 <label class="md-nav__title" for="__nav_6"> 601 <span class="md-nav__icon md-icon"></span> 602 Controlling FreeType Modules 603 </label> 604 <ul class="md-nav__list" data-md-scrollfix> 605 606 607 608 609 610 <li class="md-nav__item"> 611 <a href="ft2-auto_hinter.html" class="md-nav__link"> 612 The auto-hinter 613 </a> 614 </li> 615 616 617 618 619 620 621 622 <li class="md-nav__item"> 623 <a href="ft2-cff_driver.html" class="md-nav__link"> 624 The CFF driver 625 </a> 626 </li> 627 628 629 630 631 632 633 634 <li class="md-nav__item"> 635 <a href="ft2-t1_cid_driver.html" class="md-nav__link"> 636 The Type 1 and CID drivers 637 </a> 638 </li> 639 640 641 642 643 644 645 646 <li class="md-nav__item"> 647 <a href="ft2-tt_driver.html" class="md-nav__link"> 648 The TrueType driver 649 </a> 650 </li> 651 652 653 654 655 656 657 658 <li class="md-nav__item"> 659 <a href="ft2-pcf_driver.html" class="md-nav__link"> 660 The PCF driver 661 </a> 662 </li> 663 664 665 666 667 668 669 670 <li class="md-nav__item"> 671 <a href="ft2-ot_svg_driver.html" class="md-nav__link"> 672 The SVG driver 673 </a> 674 </li> 675 676 677 678 679 680 681 682 <li class="md-nav__item"> 683 <a href="ft2-properties.html" class="md-nav__link"> 684 Driver properties 685 </a> 686 </li> 687 688 689 690 691 692 693 694 <li class="md-nav__item"> 695 <a href="ft2-parameter_tags.html" class="md-nav__link"> 696 Parameter Tags 697 </a> 698 </li> 699 700 701 702 703 704 705 706 <li class="md-nav__item"> 707 <a href="ft2-lcd_rendering.html" class="md-nav__link"> 708 Subpixel Rendering 709 </a> 710 </li> 711 712 713 714 </ul> 715 </nav> 716 </li> 717 718 719 720 721 722 723 724 725 726 727 728 <li class="md-nav__item md-nav__item--nested"> 729 730 731 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_7" type="checkbox" id="__nav_7" > 732 733 <label class="md-nav__link" for="__nav_7"> 734 Cache Sub-System 735 <span class="md-nav__icon md-icon"></span> 736 </label> 737 <nav class="md-nav" aria-label="Cache Sub-System" data-md-level="1"> 738 <label class="md-nav__title" for="__nav_7"> 739 <span class="md-nav__icon md-icon"></span> 740 Cache Sub-System 741 </label> 742 <ul class="md-nav__list" data-md-scrollfix> 743 744 745 746 747 748 <li class="md-nav__item"> 749 <a href="ft2-cache_subsystem.html" class="md-nav__link"> 750 Cache Sub-System 751 </a> 752 </li> 753 754 755 756 </ul> 757 </nav> 758 </li> 759 760 761 762 763 764 765 766 767 768 769 770 771 772 <li class="md-nav__item md-nav__item--active md-nav__item--nested"> 773 774 775 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_8" type="checkbox" id="__nav_8" checked> 776 777 <label class="md-nav__link" for="__nav_8"> 778 Support API 779 <span class="md-nav__icon md-icon"></span> 780 </label> 781 <nav class="md-nav" aria-label="Support API" data-md-level="1"> 782 <label class="md-nav__title" for="__nav_8"> 783 <span class="md-nav__icon md-icon"></span> 784 Support API 785 </label> 786 <ul class="md-nav__list" data-md-scrollfix> 787 788 789 790 791 792 <li class="md-nav__item"> 793 <a href="ft2-computations.html" class="md-nav__link"> 794 Computations 795 </a> 796 </li> 797 798 799 800 801 802 803 804 <li class="md-nav__item"> 805 <a href="ft2-list_processing.html" class="md-nav__link"> 806 List Processing 807 </a> 808 </li> 809 810 811 812 813 814 815 816 <li class="md-nav__item"> 817 <a href="ft2-outline_processing.html" class="md-nav__link"> 818 Outline Processing 819 </a> 820 </li> 821 822 823 824 825 826 827 828 <li class="md-nav__item"> 829 <a href="ft2-quick_advance.html" class="md-nav__link"> 830 Quick retrieval of advance values 831 </a> 832 </li> 833 834 835 836 837 838 839 840 <li class="md-nav__item"> 841 <a href="ft2-bitmap_handling.html" class="md-nav__link"> 842 Bitmap Handling 843 </a> 844 </li> 845 846 847 848 849 850 851 852 <li class="md-nav__item"> 853 <a href="ft2-raster.html" class="md-nav__link"> 854 Scanline Converter 855 </a> 856 </li> 857 858 859 860 861 862 863 864 <li class="md-nav__item"> 865 <a href="ft2-glyph_stroker.html" class="md-nav__link"> 866 Glyph Stroker 867 </a> 868 </li> 869 870 871 872 873 874 875 876 <li class="md-nav__item"> 877 <a href="ft2-system_interface.html" class="md-nav__link"> 878 System Interface 879 </a> 880 </li> 881 882 883 884 885 886 887 888 <li class="md-nav__item"> 889 <a href="ft2-module_management.html" class="md-nav__link"> 890 Module Management 891 </a> 892 </li> 893 894 895 896 897 898 899 900 <li class="md-nav__item"> 901 <a href="ft2-gzip.html" class="md-nav__link"> 902 GZIP Streams 903 </a> 904 </li> 905 906 907 908 909 910 911 912 <li class="md-nav__item"> 913 <a href="ft2-lzw.html" class="md-nav__link"> 914 LZW Streams 915 </a> 916 </li> 917 918 919 920 921 922 923 924 <li class="md-nav__item"> 925 <a href="ft2-bzip2.html" class="md-nav__link"> 926 BZIP2 Streams 927 </a> 928 </li> 929 930 931 932 933 934 935 936 937 938 <li class="md-nav__item md-nav__item--active"> 939 940 <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc"> 941 942 943 944 945 946 <label class="md-nav__link md-nav__link--active" for="__toc"> 947 External Debugging APIs 948 <span class="md-nav__icon md-icon"></span> 949 </label> 950 951 <a href="ft2-debugging_apis.html" class="md-nav__link md-nav__link--active"> 952 External Debugging APIs 953 </a> 954 955 956<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> 957 958 959 960 961 962 963 <label class="md-nav__title" for="__toc"> 964 <span class="md-nav__icon md-icon"></span> 965 Table of contents 966 </label> 967 <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> 968 969 <li class="md-nav__item"> 970 <a href="#synopsis" class="md-nav__link"> 971 Synopsis 972 </a> 973 974</li> 975 976 <li class="md-nav__item"> 977 <a href="#ft_trace_set_level" class="md-nav__link"> 978 FT_Trace_Set_Level 979 </a> 980 981</li> 982 983 <li class="md-nav__item"> 984 <a href="#ft_trace_set_default_level" class="md-nav__link"> 985 FT_Trace_Set_Default_Level 986 </a> 987 988</li> 989 990 <li class="md-nav__item"> 991 <a href="#ft_custom_log_handler" class="md-nav__link"> 992 FT_Custom_Log_Handler 993 </a> 994 995</li> 996 997 <li class="md-nav__item"> 998 <a href="#ft_set_log_handler" class="md-nav__link"> 999 FT_Set_Log_Handler 1000 </a> 1001 1002</li> 1003 1004 <li class="md-nav__item"> 1005 <a href="#ft_set_default_log_handler" class="md-nav__link"> 1006 FT_Set_Default_Log_Handler 1007 </a> 1008 1009</li> 1010 1011 </ul> 1012 1013</nav> 1014 1015 </li> 1016 1017 1018 1019 </ul> 1020 </nav> 1021 </li> 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 <li class="md-nav__item md-nav__item--nested"> 1034 1035 1036 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_9" type="checkbox" id="__nav_9" > 1037 1038 <label class="md-nav__link" for="__nav_9"> 1039 Error Codes 1040 <span class="md-nav__icon md-icon"></span> 1041 </label> 1042 <nav class="md-nav" aria-label="Error Codes" data-md-level="1"> 1043 <label class="md-nav__title" for="__nav_9"> 1044 <span class="md-nav__icon md-icon"></span> 1045 Error Codes 1046 </label> 1047 <ul class="md-nav__list" data-md-scrollfix> 1048 1049 1050 1051 1052 1053 <li class="md-nav__item"> 1054 <a href="ft2-error_enumerations.html" class="md-nav__link"> 1055 Error Enumerations 1056 </a> 1057 </li> 1058 1059 1060 1061 1062 1063 1064 1065 <li class="md-nav__item"> 1066 <a href="ft2-error_code_values.html" class="md-nav__link"> 1067 Error Code Values 1068 </a> 1069 </li> 1070 1071 1072 1073 </ul> 1074 </nav> 1075 </li> 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 <li class="md-nav__item md-nav__item--nested"> 1088 1089 1090 <input class="md-nav__toggle md-toggle" data-md-toggle="__nav_10" type="checkbox" id="__nav_10" > 1091 1092 <label class="md-nav__link" for="__nav_10"> 1093 Miscellaneous 1094 <span class="md-nav__icon md-icon"></span> 1095 </label> 1096 <nav class="md-nav" aria-label="Miscellaneous" data-md-level="1"> 1097 <label class="md-nav__title" for="__nav_10"> 1098 <span class="md-nav__icon md-icon"></span> 1099 Miscellaneous 1100 </label> 1101 <ul class="md-nav__list" data-md-scrollfix> 1102 1103 1104 1105 1106 1107 <li class="md-nav__item"> 1108 <a href="ft2-gx_validation.html" class="md-nav__link"> 1109 TrueTypeGX/AAT Validation 1110 </a> 1111 </li> 1112 1113 1114 1115 1116 1117 1118 1119 <li class="md-nav__item"> 1120 <a href="ft2-incremental.html" class="md-nav__link"> 1121 Incremental Loading 1122 </a> 1123 </li> 1124 1125 1126 1127 1128 1129 1130 1131 <li class="md-nav__item"> 1132 <a href="ft2-truetype_engine.html" class="md-nav__link"> 1133 The TrueType Engine 1134 </a> 1135 </li> 1136 1137 1138 1139 1140 1141 1142 1143 <li class="md-nav__item"> 1144 <a href="ft2-ot_validation.html" class="md-nav__link"> 1145 OpenType Validation 1146 </a> 1147 </li> 1148 1149 1150 1151 </ul> 1152 </nav> 1153 </li> 1154 1155 1156 1157 </ul> 1158</nav> 1159 </div> 1160 </div> 1161 </div> 1162 1163 1164 1165 <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > 1166 <div class="md-sidebar__scrollwrap"> 1167 <div class="md-sidebar__inner"> 1168 1169<nav class="md-nav md-nav--secondary" aria-label="Table of contents"> 1170 1171 1172 1173 1174 1175 1176 <label class="md-nav__title" for="__toc"> 1177 <span class="md-nav__icon md-icon"></span> 1178 Table of contents 1179 </label> 1180 <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> 1181 1182 <li class="md-nav__item"> 1183 <a href="#synopsis" class="md-nav__link"> 1184 Synopsis 1185 </a> 1186 1187</li> 1188 1189 <li class="md-nav__item"> 1190 <a href="#ft_trace_set_level" class="md-nav__link"> 1191 FT_Trace_Set_Level 1192 </a> 1193 1194</li> 1195 1196 <li class="md-nav__item"> 1197 <a href="#ft_trace_set_default_level" class="md-nav__link"> 1198 FT_Trace_Set_Default_Level 1199 </a> 1200 1201</li> 1202 1203 <li class="md-nav__item"> 1204 <a href="#ft_custom_log_handler" class="md-nav__link"> 1205 FT_Custom_Log_Handler 1206 </a> 1207 1208</li> 1209 1210 <li class="md-nav__item"> 1211 <a href="#ft_set_log_handler" class="md-nav__link"> 1212 FT_Set_Log_Handler 1213 </a> 1214 1215</li> 1216 1217 <li class="md-nav__item"> 1218 <a href="#ft_set_default_log_handler" class="md-nav__link"> 1219 FT_Set_Default_Log_Handler 1220 </a> 1221 1222</li> 1223 1224 </ul> 1225 1226</nav> 1227 </div> 1228 </div> 1229 </div> 1230 1231 1232 <div class="md-content" data-md-component="content"> 1233 <article class="md-content__inner md-typeset"> 1234 1235 1236 1237 <p><a href="https://www.freetype.org">FreeType</a> » <a href="../">Docs</a> » <a href="index.html#support-api">Support API</a> » External Debugging APIs</p> 1238<hr /> 1239<h1 id="external-debugging-apis">External Debugging APIs<a class="headerlink" href="#external-debugging-apis" title="Permanent link">¶</a></h1> 1240<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permanent link">¶</a></h2> 1241<p>This section contains the declarations of public functions that enables fine control of what the <code>FT_DEBUG_LOGGING</code> macro outputs.</p> 1242<h2 id="ft_trace_set_level">FT_Trace_Set_Level<a class="headerlink" href="#ft_trace_set_level" title="Permanent link">¶</a></h2> 1243<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) 1244 <b>FT_Trace_Set_Level</b>( <span class="keyword">const</span> <span class="keyword">char</span>* tracing_level ); 1245</code></pre></div> 1246 1247<p>Change the levels of tracing components of FreeType at run time.</p> 1248<h4>input</h4> 1249<table class="fields"> 1250<tr><td class="val" id="tracing_level">tracing_level</td><td class="desc"> 1251<p>New tracing value.</p> 1252</td></tr> 1253</table> 1254 1255<h4>example</h4> 1256 1257<p>The following call makes FreeType trace everything but the ‘memory’ component. 1258<div class="highlight"><pre><span></span><code>FT_Trace_Set_Level( "any:7 memory:0 ); 1259</code></pre></div></p> 1260<h4>note</h4> 1261 1262<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> 1263<h4>since</h4> 1264 1265<p>2.11</p> 1266<hr> 1267 1268<h2 id="ft_trace_set_default_level">FT_Trace_Set_Default_Level<a class="headerlink" href="#ft_trace_set_default_level" title="Permanent link">¶</a></h2> 1269<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) 1270 <b>FT_Trace_Set_Default_Level</b>( <span class="keyword">void</span> ); 1271</code></pre></div> 1272 1273<p>Reset tracing value of FreeType's components to the default value (i.e., to the value of the <code>FT2_DEBUG</code> environment value or to NULL if <code>FT2_DEBUG</code> is not set).</p> 1274<h4>note</h4> 1275 1276<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> 1277<h4>since</h4> 1278 1279<p>2.11</p> 1280<hr> 1281 1282<h2 id="ft_custom_log_handler">FT_Custom_Log_Handler<a class="headerlink" href="#ft_custom_log_handler" title="Permanent link">¶</a></h2> 1283<div class = "codehilite"><pre><code> <span class="keyword">typedef</span> <span class="keyword">void</span> 1284 (*<b>FT_Custom_Log_Handler</b>)( <span class="keyword">const</span> <span class="keyword">char</span>* ft_component, 1285 <span class="keyword">const</span> <span class="keyword">char</span>* fmt, 1286 va_list args ); 1287</code></pre></div> 1288 1289<p>A function typedef that is used to handle the logging of tracing and debug messages on a file system.</p> 1290<h4>input</h4> 1291<table class="fields"> 1292<tr><td class="val" id="ft_component">ft_component</td><td class="desc"> 1293<p>The name of <code>FT_COMPONENT</code> from which the current debug or error message is produced.</p> 1294</td></tr> 1295<tr><td class="val" id="fmt">fmt</td><td class="desc"> 1296<p>Actual debug or tracing message.</p> 1297</td></tr> 1298<tr><td class="val" id="args">args</td><td class="desc"> 1299<p>Arguments of debug or tracing messages.</p> 1300</td></tr> 1301</table> 1302 1303<h4>since</h4> 1304 1305<p>2.11</p> 1306<hr> 1307 1308<h2 id="ft_set_log_handler">FT_Set_Log_Handler<a class="headerlink" href="#ft_set_log_handler" title="Permanent link">¶</a></h2> 1309<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) 1310 <b>FT_Set_Log_Handler</b>( <a href="ft2-debugging_apis.html#ft_custom_log_handler">FT_Custom_Log_Handler</a> handler ); 1311</code></pre></div> 1312 1313<p>A function to set a custom log handler.</p> 1314<h4>input</h4> 1315<table class="fields"> 1316<tr><td class="val" id="handler">handler</td><td class="desc"> 1317<p>New logging function.</p> 1318</td></tr> 1319</table> 1320 1321<h4>note</h4> 1322 1323<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> 1324<h4>since</h4> 1325 1326<p>2.11</p> 1327<hr> 1328 1329<h2 id="ft_set_default_log_handler">FT_Set_Default_Log_Handler<a class="headerlink" href="#ft_set_default_log_handler" title="Permanent link">¶</a></h2> 1330<div class = "codehilite"><pre><code> FT_EXPORT( <span class="keyword">void</span> ) 1331 <b>FT_Set_Default_Log_Handler</b>( <span class="keyword">void</span> ); 1332</code></pre></div> 1333 1334<p>A function to undo the effect of <code><a href="ft2-debugging_apis.html#ft_set_log_handler">FT_Set_Log_Handler</a></code>, resetting the log handler to FreeType's built-in version.</p> 1335<h4>note</h4> 1336 1337<p>This function does nothing if compilation option <code>FT_DEBUG_LOGGING</code> isn't set.</p> 1338<h4>since</h4> 1339 1340<p>2.11</p> 1341<hr> 1342 1343 1344 1345 1346 1347 1348 1349 </article> 1350 </div> 1351 </div> 1352 1353 </main> 1354 1355 1356<footer class="md-footer"> 1357 1358 <nav class="md-footer__inner 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