143 lines
4.8 KiB
Plaintext
143 lines
4.8 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = write;
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var _componentFlag = _interopRequireDefault(require("../../enum/componentFlag"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* @file 写glyf数据
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* @author mengke01(kekee000@gmail.com)
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*/
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/**
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* 写glyf
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*
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* @param {Object} writer 写入器
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* @param {Object} ttf ttf对象
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* @return {Object} 写入器
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*/
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function write(writer, ttf) {
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var hinting = ttf.writeOptions ? ttf.writeOptions.hinting : false;
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var writeZeroContoursGlyfData = ttf.writeOptions ? ttf.writeOptions.writeZeroContoursGlyfData : false;
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ttf.glyf.forEach(function (glyf, index) {
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// 非复合图元没有轮廓则不写
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if (!glyf.compound && !writeZeroContoursGlyfData && (!glyf.contours || !glyf.contours.length)) {
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return;
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}
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// header
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writer.writeInt16(glyf.compound ? -1 : (glyf.contours || []).length);
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writer.writeInt16(glyf.xMin);
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writer.writeInt16(glyf.yMin);
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writer.writeInt16(glyf.xMax);
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writer.writeInt16(glyf.yMax);
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var i;
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var l;
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var flags;
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// 复合图元
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if (glyf.compound) {
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for (i = 0, l = glyf.glyfs.length; i < l; i++) {
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var g = glyf.glyfs[i];
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flags = g.points ? 0 : _componentFlag.default.ARGS_ARE_XY_VALUES + _componentFlag.default.ROUND_XY_TO_GRID; // xy values
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// more components
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if (i < l - 1) {
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flags += _componentFlag.default.MORE_COMPONENTS;
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}
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// use my metrics
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flags += g.useMyMetrics ? _componentFlag.default.USE_MY_METRICS : 0;
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// overlap compound
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flags += g.overlapCompound ? _componentFlag.default.OVERLAP_COMPOUND : 0;
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var transform = g.transform;
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var a = transform.a;
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var b = transform.b;
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var c = transform.c;
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var d = transform.d;
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var e = g.points ? g.points[0] : transform.e;
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var f = g.points ? g.points[1] : transform.f;
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// xy values or points
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// int 8 放不下，则用int16放
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if (e < 0 || e > 0x7F || f < 0 || f > 0x7F) {
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flags += _componentFlag.default.ARG_1_AND_2_ARE_WORDS;
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}
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if (b || c) {
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flags += _componentFlag.default.WE_HAVE_A_TWO_BY_TWO;
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} else if ((a !== 1 || d !== 1) && a === d) {
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flags += _componentFlag.default.WE_HAVE_A_SCALE;
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} else if (a !== 1 || d !== 1) {
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flags += _componentFlag.default.WE_HAVE_AN_X_AND_Y_SCALE;
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}
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writer.writeUint16(flags);
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writer.writeUint16(g.glyphIndex);
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if (_componentFlag.default.ARG_1_AND_2_ARE_WORDS & flags) {
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writer.writeInt16(e);
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writer.writeInt16(f);
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} else {
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writer.writeUint8(e);
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writer.writeUint8(f);
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}
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if (_componentFlag.default.WE_HAVE_A_SCALE & flags) {
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writer.writeInt16(Math.round(a * 16384));
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} else if (_componentFlag.default.WE_HAVE_AN_X_AND_Y_SCALE & flags) {
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writer.writeInt16(Math.round(a * 16384));
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writer.writeInt16(Math.round(d * 16384));
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} else if (_componentFlag.default.WE_HAVE_A_TWO_BY_TWO & flags) {
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writer.writeInt16(Math.round(a * 16384));
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writer.writeInt16(Math.round(b * 16384));
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writer.writeInt16(Math.round(c * 16384));
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writer.writeInt16(Math.round(d * 16384));
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}
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}
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} else {
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var endPtsOfContours = -1;
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(glyf.contours || []).forEach(function (contour) {
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endPtsOfContours += contour.length;
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writer.writeUint16(endPtsOfContours);
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});
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// instruction
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if (hinting && glyf.instructions) {
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var instructions = glyf.instructions;
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writer.writeUint16(instructions.length);
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for (i = 0, l = instructions.length; i < l; i++) {
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writer.writeUint8(instructions[i]);
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}
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} else {
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writer.writeUint16(0);
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}
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// 获取暂存中的flags
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flags = ttf.support.glyf[index].flags || [];
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for (i = 0, l = flags.length; i < l; i++) {
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writer.writeUint8(flags[i]);
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}
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var xCoord = ttf.support.glyf[index].xCoord || [];
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for (i = 0, l = xCoord.length; i < l; i++) {
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if (0 <= xCoord[i] && xCoord[i] <= 0xFF) {
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writer.writeUint8(xCoord[i]);
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} else {
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writer.writeInt16(xCoord[i]);
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}
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}
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var yCoord = ttf.support.glyf[index].yCoord || [];
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for (i = 0, l = yCoord.length; i < l; i++) {
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if (0 <= yCoord[i] && yCoord[i] <= 0xFF) {
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writer.writeUint8(yCoord[i]);
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} else {
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writer.writeInt16(yCoord[i]);
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}
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}
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}
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// 4字节对齐
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var glyfSize = ttf.support.glyf[index].glyfSize;
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if (glyfSize % 4) {
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writer.writeEmpty(4 - glyfSize % 4);
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}
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});
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return writer;
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} |