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63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
/**
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* @file 转换复合字形的contours，以便于显示
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* @author mengke01(kekee000@gmail.com)
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*/
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import pathCeil from '../../graphics/pathCeil';
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import pathTransform from '../../graphics/pathTransform';
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import {clone} from '../../common/lang';
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/**
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* 转换复合字形轮廓，结果保存在contoursList中，并返回当前glyf的轮廓
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*
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* @param {Object} glyf glyf对象
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* @param {Object} ttf ttfObject对象
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* @param {Object=} contoursList 保存转换中间生成的contours
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* @param {number} glyfIndex glyf对象当前的index
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* @return {Array} 转换后的轮廓
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*/
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export default function transformGlyfContours(glyf, ttf, contoursList = {}, glyfIndex) {
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if (!glyf.glyfs) {
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return glyf;
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}
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const compoundContours = [];
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glyf.glyfs.forEach(g => {
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const glyph = ttf.glyf[g.glyphIndex];
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if (!glyph || glyph === glyf) {
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return;
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}
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// 递归转换contours
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if (glyph.compound && !contoursList[g.glyphIndex]) {
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transformGlyfContours(glyph, ttf, contoursList, g.glyphIndex);
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}
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// 这里需要进行matrix变换，需要复制一份
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const contours = clone(glyph.compound ? (contoursList[g.glyphIndex] || []) : glyph.contours);
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const transform = g.transform;
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for (let i = 0, l = contours.length; i < l; i++) {
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pathTransform(
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contours[i],
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transform.a,
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transform.b,
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transform.c,
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transform.d,
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transform.e,
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transform.f
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);
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compoundContours.push(pathCeil(contours[i]));
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}
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});
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// eslint-disable-next-line eqeqeq
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if (null != glyfIndex) {
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contoursList[glyfIndex] = compoundContours;
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}
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return compoundContours;
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}
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