Changed UTF8 routines and added char fallback mechanism
This commit is contained in:
Pierre-Yves Rollo
parent
35ead5a2a5
commit
b74407e11e
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@ -0,0 +1,176 @@
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--[[
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font_api mod for Minetest - Library to add font display capability
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to display_api mod.
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(c) Pierre-Yves Rollo
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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--]]
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-- This is the unicode char fallback map. If a char is not present in
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-- font, this maps indicates which char to try to use instead next.
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return {
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-- Lowercase chars
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['a'] = 'A', ['b'] = 'B', ['c'] = 'C', ['d'] = 'D',
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['e'] = 'E', ['f'] = 'F', ['g'] = 'G', ['h'] = 'H',
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['i'] = 'I', ['j'] = 'J', ['k'] = 'K', ['l'] = 'L',
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['m'] = 'M', ['n'] = 'N', ['o'] = 'O', ['p'] = 'P',
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['q'] = 'Q', ['r'] = 'R', ['s'] = 'S', ['t'] = 'T',
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['u'] = 'U', ['v'] = 'V', ['w'] = 'W', ['x'] = 'X',
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['y'] = 'Y', ['z'] = 'Z',
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-- Special
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['¢'] = 'c', ['£'] = 'L', ['¥'] = 'Y', ['€'] = 'E',
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['©'] = '(C)', ['®'] = '(R)', ['™'] = 'TM',
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['ª'] = 'a', ['º'] = 'o',
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['«'] = '"', ['»'] = '"', ['´'] = '\'',
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['¹'] = '1', ['²'] = '2', ['³'] = '3',
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['µ'] = 'u', ['¤'] = 'o',
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['¼'] = '1/4', ['½'] = '1/2', ['¾'] = '3/4',
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['⅛'] = '1/8', ['⅜'] = '3/8', ['⅝'] = '5/8', ['⅞'] = '7/8',
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['¿'] = '?',
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-- Upper case accents
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['À'] = 'A', ['Á'] = 'A', ['Â'] = 'A', ['Ã'] = 'A',
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['Ä'] = 'A', ['Å'] = 'A',
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['Æ'] = 'AE', ['Ç'] = 'C',
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['È'] = 'E', ['É'] = 'E', ['Ê'] = 'E', ['Ë'] = 'E',
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['Ì'] = 'I', ['Í'] = 'I', ['Î'] = 'I', ['Ï'] = 'I',
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['Ð'] = 'D', ['Ñ'] = 'N',
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['Ò'] = 'O', ['Ó'] = 'O', ['Ô'] = 'O', ['Õ'] = 'O',
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['Ö'] = 'O', ['Ø'] = 'O',
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['Ú'] = 'U', ['Ù'] = 'U', ['Û'] = 'U', ['Ü'] = 'U',
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['×'] = 'x', ['Ý'] = 'Y',
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-- Lower case accents
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['à'] = 'a', ['à'] = 'a', ['á'] = 'a', ['â'] = 'a',
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['ã'] = 'a', ['ä'] = 'a', ['å'] = 'a',
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['æ'] = 'ae', ['ç'] = 'c',
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['è'] = 'e', ['é'] = 'e', ['ê'] = 'e', ['ë'] = 'e',
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['ì'] = 'i', ['í'] = 'i', ['î'] = 'i', ['ï'] = 'i',
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['ð'] = 'd', ['ñ'] = 'n',
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['ò'] = 'o', ['ó'] = 'o', ['ô'] = 'o', ['õ'] = 'o',
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['ö'] = 'o', ['ø'] = 'o',
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['ù'] = 'u', ['ú'] = 'u', ['û'] = 'u', ['ü'] = 'u',
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['ý'] = 'y', ['ÿ'] = 'y',
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-- Extended latin A
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['Ā'] = 'A', ['ā'] = 'a', ['Ă'] = 'A', ['ă'] = 'a',
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['Ą'] = 'A', ['ą'] = 'a', ['Ć'] = 'C', ['ć'] = 'c',
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['Ĉ'] = 'C', ['ĉ'] = 'c', ['Ċ'] = 'C', ['ċ'] = 'c',
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['Č'] = 'C', ['č'] = 'c', ['Ď'] = 'D', ['ď'] = 'd',
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['Đ'] = 'D', ['đ'] = 'd', ['Ē'] = 'E', ['ē'] = 'e',
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['Ĕ'] = 'E', ['ĕ'] = 'e', ['Ė'] = 'E', ['ė'] = 'e',
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['Ę'] = 'E', ['ę'] = 'e', ['Ě'] = 'E', ['ě'] = 'e',
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['Ĝ'] = 'G', ['Ğ'] = 'G', ['ğ'] = 'g', ['ĝ'] = 'g',
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['Ġ'] = 'G', ['ġ'] = 'g', ['Ģ'] = 'G', ['ģ'] = 'g',
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['Ĥ'] = 'H', ['ĥ'] = 'h', ['Ħ'] = 'H', ['ħ'] = 'h',
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['Ĩ'] = 'I', ['ĩ'] = 'i', ['Ī'] = 'I', ['ī'] = 'i',
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['Ĭ'] = 'I', ['ĭ'] = 'i', ['Į'] = 'I', ['į'] = 'i',
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['ı'] = 'i', ['İ'] = 'I', ['IJ'] = 'IJ', ['ij'] = 'ij',
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['Ĵ'] = 'J', ['ĵ'] = 'j', ['ķ'] = 'k', ['Ķ'] = 'K',
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['ĸ'] = 'k',
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['Ĺ'] = 'L', ['ĺ'] = 'l', ['Ļ'] = 'L', ['ļ'] = 'l',
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['Ľ'] = 'L', ['ľ'] = 'l', ['Ŀ'] = 'L', ['ŀ'] = 'l',
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['Ł'] = 'L', ['ł'] = 'l', ['Ń'] = 'N', ['ń'] = 'n',
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['Ņ'] = 'N', ['ņ'] = 'n', ['Ň'] = 'N', ['ň'] = 'n',
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['ʼn'] = 'n', ['Ŋ'] = 'n', ['ŋ'] = 'n',
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['Ō'] = 'O', ['ō'] = 'o', ['Ŏ'] = 'O', ['ŏ'] = 'o',
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['ő'] = 'o', ['Ő'] = 'O', ['œ'] = 'oe', ['Œ'] = 'OE',
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['Ŕ'] = 'R', ['ŕ'] = 'r', ['Ŗ'] = 'R', ['ŗ'] = 'r',
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['Ř'] = 'R', ['ř'] = 'r', ['Ś'] = 'S', ['ś'] = 's',
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['Ŝ'] = 'S', ['ŝ'] = 's', ['Ş'] = 'S', ['ş'] = 's',
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['Š'] = 'S', ['š'] = 's', ['Ţ'] = 'T', ['ţ'] = 't',
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['ť'] = 't', ['Ŧ'] = 'T', ['Ť'] = 'T', ['ŧ'] = 't',
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['Ũ'] = 'U', ['ũ'] = 'u', ['Ū'] = 'U', ['ū'] = 'u',
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['Ŭ'] = 'U', ['ŭ'] = 'u', ['Ů'] = 'U', ['ů'] = 'u',
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['Ű'] = 'U', ['ű'] = 'u', ['Ų'] = 'U', ['ų'] = 'u',
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['Ŵ'] = 'W', ['ŵ'] = 'w', ['Ŷ'] = 'Y', ['ŷ'] = 'y',
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['Ÿ'] = 'Y',
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['Ź'] = 'Z', ['ź'] = 'z', ['Ż'] = 'Z', ['ż'] = 'z',
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['Ž'] = 'Z', ['ž'] = 'z', ['ſ'] = 's',
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-- Extended latin B
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['ƀ'] = 'b', ['Ɓ'] = 'B', ['Ƃ'] = 'B', ['ƃ'] = 'b',
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['Ɔ'] = 'O',
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['Ƈ'] = 'C', ['ƈ'] = 'c', ['Ɖ'] = 'D', ['Ɗ'] = 'D',
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['Ƌ'] = 'D', ['ƌ'] = 'd', ['Ǝ'] = 'E', ['Ə'] = 'e',
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['Ɛ'] = 'E',
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['Ƒ'] = 'F', ['ƒ'] = 'f', ['Ɠ'] = 'G',
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['ƕ'] = 'hv', ['Ɨ'] = 'I', ['Ƙ'] = 'K', ['ƙ'] = 'k',
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['ƚ'] = 'l', ['Ɯ'] = 'M', ['Ɲ'] = 'N', ['ƞ'] = 'n',
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['Ɵ'] = 'O',
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['Ơ'] = 'O', ['ơ'] = 'o', ['Ƣ'] = 'OI', ['ƣ'] = 'oi',
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['Ƥ'] = 'P', ['ƥ'] = 'p', ['Ʀ'] = 'YR',
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['Ƨ'] = 'S', ['ƨ'] = 's', ['ƫ'] = 't',
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['Ƭ'] = 'T', ['ƭ'] = 't', ['Ʈ'] = 'T',
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['Ư'] = 'U', ['ư'] = 'u', ['Ʋ'] = 'V',
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['Ƴ'] = 'Y', ['ƴ'] = 'y', ['Ƶ'] = 'Z', ['ƶ'] = 'z',
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['ƻ'] = '2', ['Ƽ'] = '5', ['ƽ'] = '5',
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['DŽ'] = 'DZ', ['Dž'] = 'Dz', ['dž'] = 'dz',
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['LJ'] = 'LJ', ['Lj'] = 'Lj', ['lj'] = 'lj',
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['NJ'] = 'NJ', ['Nj'] = 'Nj', ['nj'] = 'nj',
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['Ǎ'] = 'A', ['ǎ'] = 'a', ['Ǐ'] = 'I', ['ǐ'] = 'i',
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['Ǒ'] = 'O', ['ǒ'] = 'o', ['Ǔ'] = 'U', ['ǔ'] = 'u',
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['Ǖ'] = 'U', ['ǖ'] = 'u', ['Ǘ'] = 'U', ['ǘ'] = 'u',
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['Ǚ'] = 'U', ['ǚ'] = 'u', ['Ǜ'] = 'U', ['ǜ'] = 'u',
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['ǝ'] = 'e',
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['Ǟ'] = 'A', ['ǟ'] = 'a', ['Ǡ'] = 'A', ['ǡ'] = 'a',
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['Ǣ'] = 'Æ', ['ǣ'] = 'æ', ['Ǥ'] = 'G', ['ǥ'] = 'g',
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['Ǧ'] = 'G', ['ǧ'] = 'g', ['Ǩ'] = 'K', ['ǩ'] = 'k',
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['Ǫ'] = 'Q', ['ǫ'] = 'q', ['Ǭ'] = 'Q', ['ǭ'] = 'q',
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['ǰ'] = 'J',
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['DZ'] = 'DZ', ['Dz'] = 'Dz', ['dz'] = 'dz',
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['Ǵ'] = 'G', ['ǵ'] = 'g', ['Ƕ'] = 'H',
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['Ǹ'] = 'N', ['ǹ'] = 'n', ['Ǻ'] = 'A', ['ǻ'] = 'a',
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['Ǽ'] = 'Æ', ['ǽ'] = 'æ', ['Ǿ'] = 'Ø', ['ǿ'] = 'ø',
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['Ȁ'] = 'A', ['ȁ'] = 'a', ['Ȃ'] = 'A', ['ȃ'] = 'a',
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['Ȅ'] = 'E', ['ȅ'] = 'e', ['Ȇ'] = 'E', ['ȇ'] = 'e',
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['Ȉ'] = 'I', ['ȉ'] = 'i', ['Ȋ'] = 'I', ['ȋ'] = 'i',
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['Ȍ'] = 'O', ['ȍ'] = 'o', ['Ȏ'] = 'O', ['ȏ'] = 'o',
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['Ȑ'] = 'R', ['ȑ'] = 'r', ['Ȓ'] = 'R', ['ȓ'] = 'r',
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['Ȕ'] = 'U', ['ȕ'] = 'u', ['Ȗ'] = 'U', ['ȗ'] = 'u',
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['Ș'] = 'S', ['ș'] = 's', ['Ț'] = 'T', ['ț'] = 't',
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['Ȟ'] = 'H', ['ȟ'] = 'h', ['Ƞ'] = 'N',
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['ȡ'] = 'd',
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['Ȣ'] = 'OU', ['ȣ'] = 'ou', ['Ȥ'] = 'Z', ['ȥ'] = 'z',
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['Ȧ'] = 'A', ['ȧ'] = 'a', ['Ȩ'] = 'E', ['ȩ'] = 'e',
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['Ȫ'] = 'O', ['ȫ'] = 'o', ['Ȭ'] = 'O', ['ȭ'] = 'o',
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['Ȯ'] = 'O', ['ȯ'] = 'o', ['Ȱ'] = 'O', ['ȱ'] = 'o',
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['Ȳ'] = 'Y', ['ȳ'] = 'y', ['ȴ'] = 'l',
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['ȵ'] = 'n', ['ȶ'] = 't', ['ȷ'] = 'j',
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['ȸ'] = 'db', ['ȹ'] = 'qp', ['Ⱥ'] = 'A',
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['Ȼ'] = 'C', ['ȼ'] = 'c', ['Ƚ'] = 'L',
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['Ⱦ'] = 'T', ['ȿ'] = 's', ['ɀ'] = 'z',
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['Ƀ'] = 'B', ['Ʉ'] = 'U', ['Ʌ'] = 'V',
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['Ɇ'] = 'E', ['ɇ'] = 'e', ['Ɉ'] = 'J', ['ɉ'] = 'j',
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['Ɋ'] = 'Q', ['ɋ'] = 'q', ['Ɍ'] = 'R', ['ɍ'] = 'r',
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['Ɏ'] = 'Y', ['ɏ'] = 'y', ['ɐ'] = 'a',
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['ɓ'] = 'b', ['ɔ'] = 'o',
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['ɕ'] = 'c', ['ɖ'] = 'd', ['ɗ'] = 'd',
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['ɘ'] = 'e', ['ə'] = 'e', ['ɚ'] = 'e',
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['ɛ'] = 'e', ['ɜ'] = 'e', ['ɝ'] = 'e', ['ɞ'] = 'e',
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['ɟ'] = 'j',
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['ɠ'] = 'g', ['ɡ'] = 'g', ['ɢ'] = 'G',
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['ɥ'] = 'h', ['ɦ'] = 'h', ['ɧ'] = 'h',
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['ɨ'] = 'i', ['ɪ'] = 'I',
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['ɫ'] = 'l', ['ɬ'] = 'l', ['ɭ'] = 'l',
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['ɮ'] = 'lz',
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['ɯ'] = 'm', ['ɰ'] = 'm', ['ɱ'] = 'm',
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['ɲ'] = 'n', ['ɳ'] = 'n', ['ɴ'] = 'N',
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['ɵ'] = 'o', ['ɶ'] = 'Œ',
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['ɹ'] = 'r', ['ɺ'] = 'r', ['ɻ'] = 'r',
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['ɼ'] = 'r', ['ɽ'] = 'r', ['ɾ'] = 'r', ['ɿ'] = 'r',
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}
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178
font.lua
178
font.lua
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@ -17,59 +17,44 @@
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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--]]
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-- Fallback table
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local fallbacks = dofile(font_api.path.."/fallbacks.lua")
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-- Local functions
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------------------
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-- Table deep copy
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local function deep_copy(input)
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local output = {}
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local key, value
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for key, value in pairs(input) do
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if type(value) == 'table' then
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output[key] = deep_copy(value)
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else
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output[key] = value
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end
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-- Returns number of UTF8 bytes of the first char of the string
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local function get_char_bytes(str)
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local msb = str:byte(1)
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if msb ~= nil then
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if msb < 0x80 then return 1 end
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if msb >= 0xF0 then return 4 end
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if msb >= 0xE0 then return 3 end
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if msb >= 0xC2 then return 2 end
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end
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return output
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end
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-- Returns next char, managing ascii and unicode plane 0 (0000-FFFF).
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local function get_next_char(text, pos)
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local msb = text:byte(pos)
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-- 1 byte char, ascii equivalent codepoints
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if msb < 0x80 then
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return msb, pos + 1
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-- Returns the unicode codepoint of the first char of the string
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local function char_to_codepoint(str)
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local bytes = get_char_bytes(str)
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if bytes == 1 then
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return str:byte(1)
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elseif bytes == 2 then
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return (str:byte(1) - 0xC2) * 0x40
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+ str:byte(2)
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elseif bytes == 3 then
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return (str:byte(1) - 0xE0) * 0x1000
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+ str:byte(2) % 0x40 * 0x40
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+ str:byte(3) % 0x40
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elseif bytes == 4 then -- Not tested
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return (str:byte(1) - 0xF0) * 0x40000
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+ str:byte(2) % 0x40 * 0x1000
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+ str:byte(3) % 0x40 * 0x40
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+ str:byte(4) % 0x40
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end
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-- 4 bytes char not managed (Only 16 bits codepoints are managed)
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if msb >= 0xF0 then
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return 0, pos + 4
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end
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-- 3 bytes char
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if msb >= 0xE0 then
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return (msb - 0xE0) * 0x1000
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+ text:byte(pos + 1) % 0x40 * 0x40
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+ text:byte(pos + 2) % 0x40,
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pos + 3
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end
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-- 2 bytes char (little endian)
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if msb >= 0xC2 then
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return (msb - 0xC2) * 0x40 + text:byte(pos + 1),
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pos + 2
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end
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-- Not an UTF char
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return 0, pos + 1
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end
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-- Split multiline text into array of lines, with <maxlines> maximum lines.
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local function split_lines(text, maxlines)
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local splits = text:split("\n")
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if maxlines then
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@ -86,42 +71,75 @@ end
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--------------------------------------------------------------------------------
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--- Font class
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font_api.Font = {}
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local Font = {}
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font_api.Font = Font
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function font_api.Font:new(def)
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function Font:new(def)
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if type(def) ~= "table" then
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minetest.log("error", "Font definition must be a table.")
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minetest.log("error",
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"[font_api] Font definition must be a table.")
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return nil
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end
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if def.height == nil or def.height <= 0 then
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minetest.log("error", "Font definition must have a positive height.")
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minetest.log("error",
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"[font_api] Font definition must have a positive height.")
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return nil
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end
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if type(def.widths) ~= "table" then
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minetest.log("error", "Font definition must have a widths array.")
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minetest.log("error",
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"[font_api] Font definition must have a widths array.")
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return nil
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end
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if def.widths[0] == nil then
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minetest.log("error",
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"Font must have a char with codepoint 0 (=unknown char).")
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minetest.log("error",
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"[font_api] Font must have a char with codepoint 0 (=unknown char).")
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return nil
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end
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local font = deep_copy(def)
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local font = table.copy(def)
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setmetatable(font, self)
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self.__index = self
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return font
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end
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--- Gets the next char of a text
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-- @return Codepoint of first char,
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-- @return Remaining string without this first char
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function Font:get_next_char(text)
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local bytes = get_char_bytes(text)
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if bytes == nil then
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minetest.log("warning",
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"[font_api] Encountered a non UTF char, not displaying text.")
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return nil, ''
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end
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local codepoint = char_to_codepoint(text)
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-- Fallback mechanism
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if self.widths[codepoint] == nil then
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local char = text:sub(1, bytes)
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if fallbacks[char] then
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return self:get_next_char(fallbacks[char]..text:sub(bytes+1))
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else
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return 0, text:sub(bytes+1) -- Ultimate fallback
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end
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else
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return codepoint, text:sub(bytes+1)
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end
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end
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--- Returns the width of a given char
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-- @param char : codepoint of the char
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-- @return Char width
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function font_api.Font:get_char_width(char)
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function Font:get_char_width(char)
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-- Replace chars with no texture by the NULL(0) char
|
||||
if self.widths[char] ~= nil then
|
||||
return self.widths[char]
|
||||
|
|
@ -134,13 +152,13 @@ end
|
|||
-- @param nb_of_lines : number of text lines (default 1)
|
||||
-- @return Text height
|
||||
|
||||
function font_api.Font:get_height(nb_of_lines)
|
||||
function Font:get_height(nb_of_lines)
|
||||
if nb_of_lines == nil then nb_of_lines = 1 end
|
||||
|
||||
|
||||
if nb_of_lines > 0 then
|
||||
return
|
||||
return
|
||||
(
|
||||
(self.height or 0) +
|
||||
(self.height or 0) +
|
||||
(self.margintop or 0) +
|
||||
(self.marginbottom or 0)
|
||||
) * nb_of_lines +
|
||||
|
|
@ -154,16 +172,14 @@ end
|
|||
-- @param line Line of text which the width will be computed.
|
||||
-- @return Text width
|
||||
|
||||
function font_api.Font:get_width(line)
|
||||
|
||||
local char
|
||||
function Font:get_width(line)
|
||||
local codepoint
|
||||
local width = 0
|
||||
local pos = 1
|
||||
line = line or ''
|
||||
|
||||
-- TODO: Use iterator
|
||||
while pos <= #line do
|
||||
char, pos = get_next_char(line, pos)
|
||||
width = width + self:get_char_width(char)
|
||||
while line ~= "" do
|
||||
codepoint, line = self:get_next_char(line)
|
||||
width = width + self:get_char_width(codepoint)
|
||||
end
|
||||
|
||||
return width
|
||||
|
|
@ -176,30 +192,21 @@ end
|
|||
-- @param y Vertical position of the line in texture
|
||||
-- @return Texture string
|
||||
|
||||
function font_api.Font:make_line_texture(line, texturew, x, y)
|
||||
function Font:make_line_texture(line, texturew, x, y)
|
||||
local codepoint
|
||||
local texture = ""
|
||||
local char
|
||||
local pos = 1
|
||||
line = line or ''
|
||||
|
||||
-- TODO: Use iterator
|
||||
while pos <= #line do
|
||||
char, pos = get_next_char(line, pos)
|
||||
|
||||
-- Replace chars with no texture by the NULL(0) char
|
||||
if self.widths[char] == nil
|
||||
then
|
||||
print(string.format("["..font_api.name
|
||||
.."] Missing char %d (%04x)",char,char))
|
||||
char = 0
|
||||
end
|
||||
while line ~= '' do
|
||||
codepoint, line = self:get_next_char(line)
|
||||
|
||||
-- Add image only if it is visible (at least partly)
|
||||
if x + self.widths[char] >= 0 and x <= texturew then
|
||||
if x + self.widths[codepoint] >= 0 and x <= texturew then
|
||||
texture = texture..
|
||||
string.format(":%d,%d=font_%s_%04x.png",
|
||||
x, y, self.name, char)
|
||||
x, y, self.name, codepoint)
|
||||
end
|
||||
x = x + self.widths[char]
|
||||
x = x + self.widths[codepoint]
|
||||
end
|
||||
|
||||
return texture
|
||||
|
|
@ -215,13 +222,13 @@ end
|
|||
-- @param color Color of the text (optional)
|
||||
-- @return Texture string
|
||||
|
||||
function font_api.Font:make_text_texture(text, texturew, textureh, maxlines,
|
||||
function Font:make_text_texture(text, texturew, textureh, maxlines,
|
||||
halign, valign, color)
|
||||
local texture = ""
|
||||
local lines = {}
|
||||
local textheight = 0
|
||||
local y
|
||||
|
||||
|
||||
-- Split text into lines (limited to maxlines fist lines)
|
||||
for num, line in pairs(split_lines(text, maxlines)) do
|
||||
lines[num] = { text = line, width = self:get_width(line) }
|
||||
|
|
@ -238,7 +245,7 @@ function font_api.Font:make_text_texture(text, texturew, textureh, maxlines,
|
|||
y = (textureh - textheight) / 2
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
y = y + (self.margintop or 0)
|
||||
|
||||
for _, line in pairs(lines) do
|
||||
|
|
@ -263,4 +270,3 @@ function font_api.Font:make_text_texture(text, texturew, textureh, maxlines,
|
|||
if color then texture = texture.."^[colorize:"..color end
|
||||
return texture
|
||||
end
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue