--- /dev/null
+#include <assert.h>
+#include <ctype.h>
+#include <math.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <common/textspan_lut.h>
+#include <common/types.h>
+#include <common/utils.h>
+
+// 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 pipe-separated, case-insensitive 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.
+ {
+ "times|timesroman|timesnewroman|freeserif|liberationserif|nimbusroman|"
+ "texgyretermes|tinos|thorndale",
+ 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.
+ {
+ "helvetica|arial|arialmt|freesans|liberationsans|arimo|albany|"
+ "nimbussans|nimbussansa|texgyreheros|albany|arimo",
+ 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.
+ {
+ "cour|courier|couriernew|nimbusmono|texgyrecursor|freemono|"
+ "liberationmono|cousine|cumberland",
+ 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
+ {
+ "Nunito",
+ 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)
+ {
+ "dejavusans",
+ 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,
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+ 1413, 1302, 1347, 1328, 1065, 1050, 814, 1386, 1161, 1768, 1204,
+ 1151, 1076, 1024, 794, 1024, 1440, -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, 494,
+ 678, 843, 1317, 1249, 1674, 1455, 441, 768, 768, 967, 1317,
+ 552, 766, 552, 960, 1257, 880, 1144, 1130, 1157, 1082, 1159,
+ 1017, 1221, 1159, 786, 786, 1317, 1317, 1317, 980, 1902, 1374,
+ 1339, 1315, 1534, 1338, 1227, 1485, 1669, 798, 1060, 1422, 1236,
+ 1899, 1571, 1496, 1249, 1496, 1437, 1149, 1267, 1549, 1365, 1998,
+ 1455, 1260, 1232, 768, 960, 768, 1317, 1317, 1024, 1173, 1134,
+ 929, 1178, 966, 673, 1173, 1152, 609, 596, 1081, 584, 1801,
+ 1208, 1100, 1184, 1137, 945, 883, 711, 1178, 1102, 1684, 1026,
+ 1146, 909, 881, 768, 881, 1317, -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, 520,
+ 771, 1044, 1440, 1312, 1801, 1637, 551, 915, 915, 987, 1440,
+ 672, 776, 672, 966, 1436, 1003, 1283, 1279, 1330, 1227, 1327,
+ 1160, 1385, 1327, 752, 752, 1440, 1440, 1440, 1123, 1980, 1553,
+ 1555, 1465, 1708, 1477, 1375, 1653, 1870, 923, 1219, 1673, 1404,
+ 2116, 1699, 1679, 1446, 1679, 1633, 1337, 1401, 1707, 1561, 2307,
+ 1643, 1499, 1412, 915, 966, 915, 1440, 1440, 1024, 1352, 1329,
+ 1097, 1357, 1141, 780, 1330, 1383, 749, 747, 1313, 726, 2052,
+ 1413, 1302, 1357, 1331, 1093, 1059, 854, 1403, 1254, 1912, 1195,
+ 1371, 1059, 1024, 794, 1024, 1440, -1,
+ },
+ },
+ {
+ "Calibri",
+ 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, 463,
+ 667, 821, 1020, 1038, 1464, 1397, 452, 621, 621, 1020, 1020,
+ 511, 627, 517, 791, 1038, 1038, 1038, 1038, 1038, 1038, 1038,
+ 1038, 1038, 1038, 548, 548, 1020, 1020, 1020, 949, 1831, 1185,
+ 1114, 1092, 1260, 1000, 941, 1292, 1276, 516, 653, 1064, 861,
+ 1751, 1322, 1356, 1058, 1378, 1112, 941, 998, 1314, 1162, 1822,
+ 1063, 998, 959, 628, 791, 628, 1020, 1020, 596, 981, 1076,
+ 866, 1076, 1019, 625, 964, 1076, 470, 490, 931, 470, 1636,
+ 1076, 1080, 1076, 1076, 714, 801, 686, 1076, 925, 1464, 887,
+ 927, 809, 644, 943, 644, 1020, -1,
+ },
+ {
+ 0, -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, 463,
+ 667, 898, 1020, 1038, 1493, 1443, 478, 638, 638, 1020, 1020,
+ 528, 627, 547, 880, 1038, 1038, 1038, 1038, 1038, 1038, 1038,
+ 1038, 1038, 1038, 565, 565, 1020, 1020, 1020, 949, 1840, 1241,
+ 1148, 1084, 1291, 999, 940, 1305, 1292, 546, 678, 1120, 866,
+ 1790, 1349, 1385, 1090, 1405, 1153, 968, 1014, 1337, 1211, 1856,
+ 1128, 1064, 979, 665, 880, 665, 1020, 1020, 615, 1011, 1099,
+ 857, 1099, 1031, 648, 971, 1099, 503, 523, 983, 503, 1666,
+ 1099, 1101, 1099, 1099, 728, 817, 710, 1099, 969, 1526, 941,
+ 970, 814, 704, 973, 704, 1020, -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, 463,
+ 667, 821, 1020, 1038, 1464, 1397, 452, 621, 621, 1020, 1020,
+ 511, 627, 517, 794, 1038, 1038, 1038, 1038, 1038, 1038, 1038,
+ 1038, 1038, 1038, 548, 548, 1020, 1020, 1020, 949, 1831, 1185,
+ 1114, 1070, 1260, 1000, 941, 1292, 1276, 516, 653, 1064, 861,
+ 1751, 1320, 1340, 1058, 1360, 1112, 926, 998, 1314, 1162, 1823,
+ 1063, 998, 959, 628, 787, 628, 1020, 1020, 596, 1053, 1053,
+ 852, 1053, 978, 625, 1053, 1053, 470, 490, 931, 470, 1620,
+ 1053, 1051, 1053, 1053, 702, 797, 686, 1053, 913, 1464, 887,
+ 916, 809, 644, 943, 644, 1020, -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, 463,
+ 667, 898, 1020, 1038, 1493, 1443, 478, 638, 638, 1020, 1020,
+ 528, 627, 547, 889, 1038, 1038, 1038, 1038, 1038, 1038, 1038,
+ 1038, 1038, 1038, 565, 565, 1020, 1020, 1020, 949, 1840, 1241,
+ 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,
+ },
+ },
+};
+
+const static size_t all_font_metrics_len =
+ sizeof(all_font_metrics) / sizeof(all_font_metrics[0]);
+
+/// Compares two font names for equality, ignoring case and special characters.
+///
+/// E.g. "timesroman", "Times-Roman", "times ROMAN", "times_roman" and
+/// "tim8esroman" are all considered equal to eachother, but not equal to "Times
+/// New Roman".
+static bool font_name_equal_permissive(const char *a, const char *b,
+ const size_t b_length) {
+ assert(strlen(b) >= b_length);
+ 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 (!isalpha_no_locale(a[a_pos])) {
+ ++a_pos;
+ continue;
+ }
+ if (!isalpha_no_locale(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 (isalpha_no_locale(a[a_pos])) {
+ return false;
+ }
+ ++a_pos;
+ }
+ while (b_pos != b_length) {
+ if (isalpha_no_locale(b[b_pos])) {
+ return false;
+ }
+ ++b_pos;
+ }
+ return true;
+}
+
+/// Checks whether a font name is in a pipe-separated list of font names,
+/// ignoring case and special characters.
+///
+/// E.g. "Times-Roman" and "TimesNewRoman" are both in
+/// "times|timesroman|timesnewroman", but "Arial" is not.
+static bool font_in_list_permissive(const char *value, const char *list) {
+ assert(value && strlen(value));
+ assert(list && strlen(list));
+
+ do {
+ const char *next_pipe = strchr(list, '|');
+ size_t next_pipe_or_end_pos = next_pipe ? next_pipe - list : strlen(list);
+ if (font_name_equal_permissive(value, list, next_pipe_or_end_pos)) {
+ return true;
+ }
+ list = next_pipe ? next_pipe + 1 : NULL;
+ } while (list);
+
+ 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];
+ }
+ }
+ fprintf(stderr,
+ "Warning: no hard-coded metrics for '%s'. Falling back to 'Times' "
+ "metrics\n",
+ font_name);
+ 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;
+ fprintf(stderr,
+ "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;
+ fprintf(stderr,
+ "Warning: no value for width of ASCII character %u. Falling back "
+ "to 0\n",
+ character);
+ }
+ width = 0;
+ }
+ assert(width >= 0);
+ return 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;
+}
projects / graphviz / commitdiff