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