113 lines
3.5 KiB
Plaintext
113 lines
3.5 KiB
Plaintext
/**
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* @file glyf表
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* @author mengke01(kekee000@gmail.com)
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*
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6glyf.html
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*/
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import table from './table';
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import parse from './glyf/parse';
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import write from './glyf/write';
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import sizeof from './glyf/sizeof';
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import {isEmptyObject} from '../../common/lang';
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export default table.create(
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'glyf',
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[],
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{
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read(reader, ttf) {
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const startOffset = this.offset;
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const loca = ttf.loca;
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const numGlyphs = ttf.maxp.numGlyphs;
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const glyphs = [];
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reader.seek(startOffset);
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// subset
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const subset = ttf.readOptions.subset;
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if (subset && subset.length > 0) {
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const subsetMap = {
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0: true // 设置.notdef
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};
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subsetMap[0] = true;
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// subset map
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const cmap = ttf.cmap;
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// unicode to index
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Object.keys(cmap).forEach((c) => {
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if (subset.indexOf(+c) > -1) {
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const i = cmap[c];
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subsetMap[i] = true;
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}
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});
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ttf.subsetMap = subsetMap;
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const parsedGlyfMap = {};
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// 循环解析subset相关的glyf，包括复合字形相关的字形
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const travelsParse = function travels(subsetMap) {
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const newSubsetMap = {};
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Object.keys(subsetMap).forEach((i) => {
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const index = +i;
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parsedGlyfMap[index] = true;
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// 当前的和下一个一样，或者最后一个无轮廓
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if (loca[index] === loca[index + 1]) {
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glyphs[index] = {
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contours: []
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};
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}
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else {
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glyphs[index] = parse(reader, ttf, startOffset + loca[index]);
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}
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if (glyphs[index].compound) {
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glyphs[index].glyfs.forEach((g) => {
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if (!parsedGlyfMap[g.glyphIndex]) {
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newSubsetMap[g.glyphIndex] = true;
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}
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});
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}
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});
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if (!isEmptyObject(newSubsetMap)) {
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travels(newSubsetMap);
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}
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};
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travelsParse(subsetMap);
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return glyphs;
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}
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// 解析字体轮廓, 前n-1个
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let i;
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let l;
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for (i = 0, l = numGlyphs - 1; i < l; i++) {
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// 当前的和下一个一样，或者最后一个无轮廓
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if (loca[i] === loca[i + 1]) {
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glyphs[i] = {
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contours: []
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};
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}
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else {
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glyphs[i] = parse(reader, ttf, startOffset + loca[i]);
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}
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}
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// 最后一个轮廓
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if ((ttf.tables.glyf.length - loca[i]) < 5) {
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glyphs[i] = {
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contours: []
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};
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}
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else {
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glyphs[i] = parse(reader, ttf, startOffset + loca[i]);
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}
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return glyphs;
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},
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write,
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size: sizeof
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}
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);
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