67 lines
1.8 KiB
Plaintext
67 lines
1.8 KiB
Plaintext
/**
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* @file 对ttf对象进行优化，查找错误，去除冗余点
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* @author mengke01(kekee000@gmail.com)
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*/
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import reduceGlyf from './reduceGlyf';
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import pathCeil from '../../graphics/pathCeil';
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/**
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* 对ttf对象进行优化
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*
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* @param {Object} ttf ttf对象
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* @return {true|Object} 错误信息
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*/
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export default function optimizettf(ttf) {
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const checkUnicodeRepeat = {}; // 检查是否有重复代码点
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const repeatList = [];
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ttf.glyf.forEach((glyf, index) => {
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if (glyf.unicode) {
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glyf.unicode = glyf.unicode.sort();
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// 将glyf的代码点按小到大排序
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glyf.unicode.sort((a, b) => a - b).forEach((u) => {
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if (checkUnicodeRepeat[u]) {
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repeatList.push(index);
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}
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else {
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checkUnicodeRepeat[u] = true;
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}
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});
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}
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if (!glyf.compound && glyf.contours) {
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// 整数化
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glyf.contours.forEach((contour) => {
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pathCeil(contour);
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});
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// 缩减glyf
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reduceGlyf(glyf);
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}
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// 整数化
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glyf.xMin = Math.round(glyf.xMin || 0);
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glyf.xMax = Math.round(glyf.xMax || 0);
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glyf.yMin = Math.round(glyf.yMin || 0);
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glyf.yMax = Math.round(glyf.yMax || 0);
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glyf.leftSideBearing = Math.round(glyf.leftSideBearing || 0);
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glyf.advanceWidth = Math.round(glyf.advanceWidth || 0);
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});
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// 过滤无轮廓字体，如果存在复合字形不进行过滤
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if (!ttf.glyf.some((a) => a.compound)) {
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ttf.glyf = ttf.glyf.filter((glyf, index) => index === 0 || glyf.contours && glyf.contours.length);
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}
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if (!repeatList.length) {
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return true;
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}
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return {
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repeat: repeatList
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};
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}
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