/// @file /// @ingroup common_render #include #include #include #include #include #include #include #include #include #include #include #include // Currently we just store the width of every ASCII character, which seems to // produce good enough results. We could also store kerning metrics and line // heights for each font if we want to be more thorough. struct FontFamilyMetrics { // A case-insensitive NULL-terminated list of font family names which these // metrics correspond to. If multiple font families are listed, they should be // metrically equivalent. const char **font_name; // Widths are stored in (units_per_em * 1) pt. (that is how TrueType works // internally). A value of -1 indicates that the width for that character is // unknown. double units_per_em; short widths_regular[128]; short widths_bold[128]; short widths_italic[128]; short widths_bold_italic[128]; }; static const struct FontFamilyMetrics all_font_metrics[] = { // Times_New_Roman.ttf (+ variants) from ttf-mscorefonts-installer. { (const char *[]){"times", "timesroman", "timesnewroman", "freeserif", "liberationserif", "nimbusroman", "texgyretermes", "tinos", "thorndale", NULL}, 2048, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 512, 682, 836, 1024, 1024, 1706, 1593, 369, 682, 682, 1024, 1155, 512, 682, 512, 569, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 569, 569, 1155, 1155, 1155, 909, 1886, 1479, 1366, 1366, 1479, 1251, 1139, 1479, 1479, 682, 797, 1479, 1251, 1821, 1479, 1479, 1139, 1479, 1366, 1139, 1251, 1479, 1479, 1933, 1479, 1479, 1251, 682, 569, 682, 961, 1024, 682, 909, 1024, 909, 1024, 909, 682, 1024, 1024, 569, 569, 1024, 569, 1593, 1024, 1024, 1024, 1024, 682, 797, 569, 1024, 1024, 1479, 1024, 1024, 909, 983, 410, 983, 1108, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 512, 682, 1137, 1024, 1024, 2048, 1706, 569, 682, 682, 1024, 1167, 512, 682, 512, 569, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 682, 682, 1167, 1167, 1167, 1024, 1905, 1479, 1366, 1479, 1479, 1366, 1251, 1593, 1593, 797, 1024, 1593, 1366, 1933, 1479, 1593, 1251, 1593, 1479, 1139, 1366, 1479, 1479, 2048, 1479, 1479, 1366, 682, 569, 682, 1190, 1024, 682, 1024, 1139, 909, 1139, 909, 682, 1024, 1139, 569, 682, 1139, 569, 1706, 1139, 1024, 1139, 1139, 909, 797, 682, 1139, 1024, 1479, 1024, 1024, 909, 807, 451, 807, 1065, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 512, 682, 860, 1024, 1024, 1706, 1593, 438, 682, 682, 1024, 1382, 512, 682, 512, 569, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 682, 682, 1382, 1382, 1382, 1024, 1884, 1251, 1251, 1366, 1479, 1251, 1251, 1479, 1479, 682, 909, 1366, 1139, 1706, 1366, 1479, 1251, 1479, 1251, 1024, 1139, 1479, 1251, 1706, 1251, 1139, 1139, 797, 569, 797, 864, 1024, 682, 1024, 1024, 909, 1024, 909, 569, 1024, 1024, 569, 569, 909, 569, 1479, 1024, 1024, 1024, 1024, 797, 797, 569, 1024, 909, 1366, 909, 909, 797, 819, 563, 819, 1108, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 512, 797, 1137, 1024, 1024, 1706, 1593, 569, 682, 682, 1024, 1167, 512, 682, 512, 569, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 682, 682, 1167, 1167, 1167, 1024, 1704, 1366, 1366, 1366, 1479, 1366, 1366, 1479, 1593, 797, 1024, 1366, 1251, 1821, 1479, 1479, 1251, 1479, 1366, 1139, 1251, 1479, 1366, 1821, 1366, 1251, 1251, 682, 569, 682, 1167, 1024, 682, 1024, 1024, 909, 1024, 909, 682, 1024, 1139, 569, 569, 1024, 569, 1593, 1139, 1024, 1024, 1024, 797, 797, 569, 1139, 909, 1366, 1024, 909, 797, 713, 451, 713, 1167, -1, }, }, // Arial.ttf (+ variants) from ttf-mscorefonts-installer. { (const char *[]){"helvetica", "arial", "arialmt", "freesans", "liberationsans", "arimo", "albany", "nimbussans", "nimbussansa", "texgyreheros", "albany", "arimo", NULL}, 2048, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 569, 569, 727, 1139, 1139, 1821, 1366, 391, 682, 682, 797, 1196, 569, 682, 569, 569, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 569, 569, 1196, 1196, 1196, 1139, 2079, 1366, 1366, 1479, 1479, 1366, 1251, 1593, 1479, 569, 1024, 1366, 1139, 1706, 1479, 1593, 1366, 1593, 1479, 1366, 1251, 1479, 1366, 1933, 1366, 1366, 1251, 569, 569, 569, 961, 1139, 682, 1139, 1139, 1024, 1139, 1139, 569, 1139, 1139, 455, 455, 1024, 455, 1706, 1139, 1139, 1139, 1139, 682, 1024, 569, 1139, 1024, 1479, 1024, 1024, 1024, 684, 532, 684, 1196, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 569, 682, 971, 1139, 1139, 1821, 1479, 487, 682, 682, 797, 1196, 569, 682, 569, 569, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 682, 682, 1196, 1196, 1196, 1251, 1997, 1479, 1479, 1479, 1479, 1366, 1251, 1593, 1479, 569, 1139, 1479, 1251, 1706, 1479, 1593, 1366, 1593, 1479, 1366, 1251, 1479, 1366, 1933, 1366, 1366, 1251, 682, 569, 682, 1196, 1139, 682, 1139, 1251, 1139, 1251, 1139, 682, 1251, 1251, 569, 569, 1139, 569, 1821, 1251, 1251, 1251, 1251, 797, 1139, 682, 1251, 1139, 1593, 1139, 1139, 1024, 797, 573, 797, 1196, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 569, 569, 727, 1139, 1139, 1821, 1366, 391, 682, 682, 797, 1196, 569, 682, 569, 569, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 569, 569, 1196, 1196, 1196, 1139, 2079, 1366, 1366, 1479, 1479, 1366, 1251, 1593, 1479, 569, 1024, 1366, 1139, 1706, 1479, 1593, 1366, 1593, 1479, 1366, 1251, 1479, 1366, 1933, 1366, 1366, 1251, 569, 569, 569, 961, 1139, 682, 1139, 1139, 1024, 1139, 1139, 569, 1139, 1139, 455, 455, 1024, 455, 1706, 1139, 1139, 1139, 1139, 682, 1024, 569, 1139, 1024, 1479, 1024, 1024, 1024, 684, 532, 684, 1196, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 569, 682, 971, 1139, 1139, 1821, 1479, 487, 682, 682, 797, 1196, 569, 682, 569, 569, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 1139, 682, 682, 1196, 1196, 1196, 1251, 1997, 1479, 1479, 1479, 1479, 1366, 1251, 1593, 1479, 569, 1139, 1479, 1251, 1706, 1479, 1593, 1366, 1593, 1479, 1366, 1251, 1479, 1366, 1933, 1366, 1366, 1251, 682, 569, 682, 1196, 1139, 682, 1139, 1251, 1139, 1251, 1139, 682, 1251, 1251, 569, 569, 1139, 569, 1821, 1251, 1251, 1251, 1251, 797, 1139, 682, 1251, 1139, 1593, 1139, 1139, 1024, 797, 573, 797, 1196, -1, }, }, // Courier_New.ttf (+ variants) from ttf-mscorefonts-installer. { (const char *[]){"cour", "courier", "couriernew", "nimbusmono", "texgyrecursor", "freemono", "liberationmono", "cousine", "cumberland", NULL}, 2048, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, 1229, -1, }, }, // https://fonts.google.com/specimen/Nunito { (const char *[]){"Nunito", NULL}, 1000, { 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 258, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 258, 228, 392, 600, 600, 930, 693, 221, 317, 317, 450, 600, 228, 424, 228, 283, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 228, 228, 600, 600, 600, 443, 946, 729, 676, 673, 742, 583, 548, 726, 761, 257, 324, 625, 543, 855, 740, 767, 633, 767, 669, 615, 602, 728, 689, 1101, 650, 596, 589, 315, 283, 315, 600, 500, 500, 530, 583, 463, 583, 532, 333, 586, 568, 232, 236, 500, 296, 856, 568, 556, 583, 583, 358, 481, 350, 561, 515, 841, 525, 514, 463, 352, 265, 352, 600, -1, }, { 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 271, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 271, 248, 448, 600, 600, 945, 726, 243, 358, 358, 453, 600, 248, 434, 248, 313, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 248, 248, 600, 600, 600, 459, 950, 744, 688, 680, 762, 597, 562, 736, 773, 282, 354, 665, 562, 868, 748, 785, 652, 785, 686, 631, 621, 738, 713, 1113, 672, 618, 605, 354, 313, 354, 600, 500, 500, 547, 600, 472, 600, 542, 364, 604, 585, 255, 259, 536, 319, 877, 585, 576, 600, 600, 392, 488, 384, 579, 527, 853, 546, 526, 474, 391, 288, 391, 600, -1, }, { 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 258, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 258, 228, 392, 600, 600, 930, 693, 221, 317, 317, 450, 600, 228, 424, 228, 283, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 228, 228, 600, 600, 600, 443, 946, 729, 676, 673, 742, 583, 548, 726, 761, 257, 324, 625, 543, 856, 739, 767, 633, 767, 669, 615, 602, 728, 688, 1101, 650, 596, 589, 315, 283, 315, 600, 500, 500, 530, 583, 463, 583, 532, 333, 586, 568, 232, 236, 500, 296, 856, 568, 556, 583, 583, 358, 481, 350, 561, 515, 841, 525, 514, 463, 352, 265, 352, 600, -1, }, { 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 271, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 271, 248, 448, 600, 600, 945, 726, 243, 358, 358, 453, 600, 248, 434, 248, 313, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 248, 248, 600, 600, 600, 459, 950, 744, 688, 680, 762, 597, 562, 736, 773, 282, 354, 664, 562, 869, 747, 785, 652, 785, 686, 631, 621, 738, 713, 1113, 672, 618, 605, 354, 313, 354, 600, 500, 500, 547, 600, 472, 600, 542, 364, 604, 585, 255, 259, 536, 319, 877, 585, 576, 600, 600, 392, 488, 384, 579, 527, 853, 546, 526, 474, 391, 288, 391, 600, -1, }, }, // Based on DejaVuSans, DejaVuSans-Bold, DejaVuSans-Oblique and // DejaVuSans-BoldOblique (as opposed to italic) { (const char *[]){"dejavusans", NULL}, 2048, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 651, 821, 942, 1716, 1303, 1946, 1597, 563, 799, 799, 1024, 1716, 651, 739, 651, 690, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 690, 690, 1716, 1716, 1716, 1087, 2048, 1401, 1405, 1430, 1577, 1294, 1178, 1587, 1540, 604, 604, 1343, 1141, 1767, 1532, 1612, 1235, 1612, 1423, 1300, 1251, 1499, 1401, 2025, 1403, 1251, 1403, 799, 690, 799, 1716, 1024, 1024, 1255, 1300, 1126, 1300, 1260, 721, 1300, 1298, 569, 569, 1186, 569, 1995, 1298, 1253, 1300, 1300, 842, 1067, 803, 1298, 1212, 1675, 1212, 1212, 1075, 1303, 690, 1303, 1716, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 713, 934, 1067, 1716, 1425, 2052, 1786, 627, 936, 936, 1071, 1716, 778, 850, 778, 748, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 819, 819, 1716, 1716, 1716, 1188, 2048, 1585, 1561, 1503, 1700, 1399, 1399, 1681, 1714, 762, 762, 1587, 1305, 2038, 1714, 1741, 1501, 1741, 1577, 1475, 1397, 1663, 1585, 2259, 1579, 1483, 1485, 936, 748, 936, 1716, 1024, 1024, 1382, 1466, 1214, 1466, 1389, 891, 1466, 1458, 702, 702, 1362, 702, 2134, 1458, 1407, 1466, 1466, 1010, 1219, 979, 1458, 1335, 1892, 1321, 1335, 1192, 1458, 748, 1458, 1716, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 651, 821, 942, 1716, 1303, 1946, 1597, 563, 799, 799, 1024, 1716, 651, 739, 651, 690, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 1303, 690, 690, 1716, 1716, 1716, 1087, 2048, 1401, 1405, 1430, 1577, 1294, 1178, 1587, 1540, 604, 604, 1343, 1141, 1767, 1532, 1612, 1235, 1612, 1423, 1300, 1251, 1499, 1401, 2025, 1403, 1251, 1403, 799, 690, 799, 1716, 1024, 1024, 1255, 1300, 1126, 1300, 1260, 721, 1300, 1298, 569, 569, 1186, 569, 1995, 1298, 1253, 1300, 1300, 842, 1067, 803, 1298, 1212, 1675, 1212, 1212, 1075, 1303, 690, 1303, 1716, -1, }, { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 713, 934, 1067, 1425, 1425, 2052, 1786, 627, 936, 936, 1071, 1716, 778, 850, 778, 748, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 1425, 819, 819, 1716, 1716, 1716, 1188, 2048, 1585, 1561, 1503, 1700, 1399, 1399, 1681, 1714, 762, 762, 1587, 1305, 2038, 1714, 1741, 1501, 1741, 1577, 1475, 1397, 1663, 1585, 2259, 1579, 1483, 1485, 936, 748, 936, 1716, 1024, 1024, 1382, 1466, 1214, 1466, 1389, 891, 1466, 1458, 702, 702, 1362, 702, 2134, 1458, 1407, 1466, 1466, 1010, 1219, 979, 1458, 1335, 1892, 1321, 1335, 1192, 1458, 748, 1458, 1716, -1, }, }, { (const char *[]){"consola", "consolas", NULL}, 2048, { 1126, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 1126, 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1148, 1062, 1291, 999, 940, 1305, 1292, 546, 678, 1120, 866, 1790, 1344, 1369, 1090, 1387, 1153, 953, 1014, 1337, 1211, 1857, 1128, 1064, 979, 665, 870, 665, 1020, 1020, 615, 1081, 1081, 843, 1081, 1006, 648, 1081, 1080, 503, 523, 983, 503, 1646, 1080, 1080, 1081, 1081, 721, 807, 710, 1080, 961, 1526, 941, 963, 814, 704, 973, 704, 1020, -1, }, }, }; static const size_t all_font_metrics_len = sizeof(all_font_metrics) / sizeof(all_font_metrics[0]); /// Compares two font names for equality, ignoring case and all characters /// except ASCII letters /// /// E.g. "timesroman", "Times-Roman", "times ROMAN", "times_roman" and /// "tim8esroman" are all considered equal to each other, but not equal to /// "Times New Roman". static bool font_name_equal_permissive(const char *a, const char *b) { size_t b_length = strlen(b); size_t a_length = strlen(a); size_t a_pos = 0; size_t b_pos = 0; while (a_pos != a_length && b_pos != b_length) { if (!gv_isalpha(a[a_pos])) { ++a_pos; continue; } if (!gv_isalpha(b[b_pos])) { ++b_pos; continue; } if (tolower(a[a_pos]) != tolower(b[b_pos])) { return false; } ++a_pos; ++b_pos; } while (a_pos != a_length) { if (gv_isalpha(a[a_pos])) { return false; } ++a_pos; } while (b_pos != b_length) { if (gv_isalpha(b[b_pos])) { return false; } ++b_pos; } return true; } /// Checks whether a font name is in a list of font names, ignoring case and /// special characters. /// /// E.g. "Times-Roman" and "TimesNewRoman" are both in /// {"times", "timesroman", "timesnewroman", NULL}, but "Arial" is not. static bool font_in_list_permissive(const char *value, const char **list) { assert(value && strlen(value)); assert(list && list[0] != NULL); for (size_t i = 0; list[i] != NULL; ++i) { if (font_name_equal_permissive(value, list[i])) { return true; } } return false; } static const struct FontFamilyMetrics * get_metrics_for_font_family(const char *font_name) { for (size_t i = 0; i < all_font_metrics_len; i++) { if (font_in_list_permissive(font_name, all_font_metrics[i].font_name)) { return &all_font_metrics[i]; } } agxbuf warning = {0}; agxbprint(&warning, "Warning: no hard-coded metrics for '%s'. Falling back to 'Times' " "metrics\n", font_name); char *warning_text = agxbuse(&warning); if (emit_once(warning_text)) { agwarningf("%s", warning_text); } agxbfree(&warning); return get_metrics_for_font_family("Times"); } static const short * get_metrics_for_font_variant(const struct FontFamilyMetrics *family_metrics, bool bold, bool italic) { if (bold && italic) { return family_metrics->widths_bold_italic; } if (bold) { return family_metrics->widths_bold; } if (italic) { return family_metrics->widths_italic; } return family_metrics->widths_regular; } /// @returns the width of the character in (units_per_em * 1) points. static unsigned short estimate_character_width_canonical(const short variant_metrics[128], unsigned character) { if (character >= 128) { static bool warning_already_reported = false; if (!warning_already_reported) { // stderr spam prevention warning_already_reported = true; agwarningf( "Warning: no value for width of non-ASCII character %u. Falling " "back to width of space character\n", character); } character = ' '; } short width = variant_metrics[character]; if (width == -1) { static bool warning_already_reported = false; if (!warning_already_reported) { // stderr spam prevention warning_already_reported = true; agwarningf( "Warning: no value for width of ASCII character %u. Falling back " "to 0\n", character); } width = 0; } assert(width >= 0); return (unsigned short)width; } double estimate_text_width_1pt(const char *font_name, const char *text, bool bold, bool italic) { assert(font_name); assert(text); const struct FontFamilyMetrics *family_metrics = get_metrics_for_font_family(font_name); const short *variant_metrics = get_metrics_for_font_variant(family_metrics, bold, italic); unsigned text_width_canonical = 0; for (const char *c = text; *c != '\0'; c++) { text_width_canonical += estimate_character_width_canonical(variant_metrics, (unsigned char)*c); } return (double)text_width_canonical / family_metrics->units_per_em; }