74 lines
2.7 KiB
JavaScript
74 lines
2.7 KiB
JavaScript
var fs = require('fs');
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var TTFReader = require('node-sfnt').TTFReader;
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var TTFWriter = require('node-sfnt').TTFWriter;
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var argv = require('yargs').argv;
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function toArrayBuffer(buffer) {
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var length = buffer.length;
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var view = new DataView(new ArrayBuffer(length), 0, length);
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for (var i = 0, l = length; i < l; i++) {
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view.setUint8(i, buffer[i], false);
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}
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return view.buffer;
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}
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function toBuffer(arrayBuffer) {
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var length = arrayBuffer.byteLength;
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var view = new DataView(arrayBuffer, 0, length);
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var buffer = new Buffer(length);
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for (var i = 0, l = length; i < l; i++) {
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buffer[i] = view.getUint8(i, false);
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}
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return buffer;
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}
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var options = {preserveOS2Version: true, preserveXAvgCharWidth: true, writeUnknownTables: true, hinting: true}
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function readttf(file) {
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var data = fs.readFileSync(file);
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var buffer = toArrayBuffer(data);
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var ttf = (new TTFReader(options)).read(buffer);
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return ttf;
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}
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function writettf(ttf, file){
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var buffer = new TTFWriter(options).write(ttf);
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fs.writeFileSync(file, toBuffer(buffer));
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}
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function mix(a, b, p){ return a + (b - a) * p }
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function ratio(l, m, r){
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if(l === r) return 0;
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return (m - l) / (r - l);
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}
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function colinear(a, b, c){
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return Math.abs(((c.y - a.y) * (b.x - a.x) - (c.x - a.x) * (b.y - a.y))) <= 1e-5
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}
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var ttf = readttf(argv._[0]);
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var targetupm = argv.upm - 0 || 1000;
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var upm = ttf.head.unitsPerEm - 0;
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var skew = Math.tan(ttf.post.italicAngle / 180 * Math.PI);
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for(var j = 0; j < ttf.glyf.length; j++){
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var glyph = ttf.glyf[j];
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if(glyph.contours && glyph.contours.length > 0) for(var k = 0; k < glyph.contours.length; k++) if(glyph.contours[k].length > 0) {
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var c = glyph.contours[k];
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for(var l = 0; l < c.length; l++){
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c[l].x += skew * c[l].y
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}
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var xs = c.map(function(p){ return p.x });
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var ys = c.map(function(p){ return p.y });
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var xmin = Math.min.apply(null, xs);
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var xmax = Math.max.apply(null, xs);
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var ymin = Math.min.apply(null, ys);
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var ymax = Math.max.apply(null, ys);
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var rxmin = (upm / targetupm) * Math.round(xmin * targetupm / upm);
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var rxmax = (upm / targetupm) * Math.round(xmax * targetupm / upm);
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var rymin = (upm / targetupm) * Math.round(ymin * targetupm / upm);
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var rymax = (upm / targetupm) * Math.round(ymax * targetupm / upm);
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for(var l = 0; l < c.length; l++){
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c[l].y = (upm / targetupm) * (mix(rymin, rymax, ratio(ymin, c[l].y, ymax)) * targetupm / upm)
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c[l].x = (upm / targetupm) * ((mix(rxmin, rxmax, ratio(xmin, c[l].x, xmax)) - c[l].y * skew) * targetupm / upm)
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}
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glyph.contours[k] = c.filter(function(p){ return !p.removable })
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}
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}
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fs.writeFileSync(argv._[1], toBuffer(new TTFWriter(options).write(ttf))); |