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94 lines
2.7 KiB
Plaintext
94 lines
2.7 KiB
Plaintext
/**
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* @file glyf的缩放和平移调整
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* @author mengke01(kekee000@gmail.com)
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*/
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import pathAdjust from '../../graphics/pathAdjust';
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import pathCeil from '../../graphics/pathCeil';
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import {computePathBox} from '../../graphics/computeBoundingBox';
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/**
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* 简单字形的缩放和平移调整
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*
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* @param {Object} g glyf对象
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* @param {number} scaleX x缩放比例
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* @param {number} scaleY y缩放比例
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* @param {number} offsetX x偏移
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* @param {number} offsetY y偏移
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* @param {boolan} useCeil 是否对字形设置取整，默认取整
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*
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* @return {Object} 调整后的glyf对象
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*/
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export default function glyfAdjust(g, scaleX = 1, scaleY = 1, offsetX = 0, offsetY = 0, useCeil = true) {
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if (g.contours && g.contours.length) {
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if (scaleX !== 1 || scaleY !== 1) {
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g.contours.forEach((contour) => {
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pathAdjust(contour, scaleX, scaleY);
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});
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}
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if (offsetX !== 0 || offsetY !== 0) {
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g.contours.forEach((contour) => {
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pathAdjust(contour, 1, 1, offsetX, offsetY);
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});
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}
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if (false !== useCeil) {
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g.contours.forEach((contour) => {
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pathCeil(contour);
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});
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}
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}
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// 重新计算xmin，xmax，ymin，ymax
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const advanceWidth = g.advanceWidth;
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if (
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undefined === g.xMin
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|| undefined === g.yMax
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|| undefined === g.leftSideBearing
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|| undefined === g.advanceWidth
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) {
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// 有的字形没有形状，需要特殊处理一下
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let bound;
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if (g.contours && g.contours.length) {
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// eslint-disable-next-line no-invalid-this
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bound = computePathBox.apply(this, g.contours);
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}
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else {
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bound = {
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x: 0,
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y: 0,
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width: 0,
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height: 0
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};
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}
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g.xMin = bound.x;
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g.xMax = bound.x + bound.width;
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g.yMin = bound.y;
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g.yMax = bound.y + bound.height;
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g.leftSideBearing = g.xMin;
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// 如果设置了advanceWidth就是用默认的，否则为xMax + abs(xMin)
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if (undefined !== advanceWidth) {
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g.advanceWidth = Math.round(advanceWidth * scaleX + offsetX);
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}
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else {
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g.advanceWidth = g.xMax + Math.abs(g.xMin);
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}
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}
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else {
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g.xMin = Math.round(g.xMin * scaleX + offsetX);
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g.xMax = Math.round(g.xMax * scaleX + offsetX);
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g.yMin = Math.round(g.yMin * scaleY + offsetY);
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g.yMax = Math.round(g.yMax * scaleY + offsetY);
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g.leftSideBearing = Math.round(g.leftSideBearing * scaleX + offsetX);
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g.advanceWidth = Math.round(advanceWidth * scaleX + offsetX);
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}
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return g;
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}
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