143 lines
4.5 KiB
Plaintext
143 lines
4.5 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 = readWindowsAllCodes;
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/* eslint-disable */
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/**
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* @file 读取windows支持的字符集
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* @author mengke01(kekee000@gmail.com)
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*
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* @see
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html
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*/
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/**
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* 读取ttf中windows字符表的字符
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*
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* @param {Array} tables cmap表结构
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* @param {Object} ttf ttf对象
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* @return {Object} 字符字典索引，unicode => glyf index
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*/
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function readWindowsAllCodes(tables, ttf) {
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var codes = {};
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// 读取windows unicode 编码段
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var format0 = tables.find(function (item) {
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return item.format === 0;
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});
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// 读取windows unicode 编码段
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var format12 = tables.find(function (item) {
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return item.platformID === 3 && item.encodingID === 10 && item.format === 12;
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});
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var format4 = tables.find(function (item) {
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return item.platformID === 3 && item.encodingID === 1 && item.format === 4;
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});
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var format2 = tables.find(function (item) {
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return item.platformID === 3 && item.encodingID === 3 && item.format === 2;
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});
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var format14 = tables.find(function (item) {
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return item.platformID === 0 && item.encodingID === 5 && item.format === 14;
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});
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if (format0) {
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for (var i = 0, l = format0.glyphIdArray.length; i < l; i++) {
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if (format0.glyphIdArray[i]) {
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codes[i] = format0.glyphIdArray[i];
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}
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}
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}
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// format 14 support
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if (format14) {
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for (var _i = 0, _l = format14.groups.length; _i < _l; _i++) {
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var _format14$groups$_i = format14.groups[_i],
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unicode = _format14$groups$_i.unicode,
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glyphId = _format14$groups$_i.glyphId;
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if (unicode) {
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codes[unicode] = glyphId;
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}
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}
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}
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// 读取format12表
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if (format12) {
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for (var _i2 = 0, _l2 = format12.nGroups; _i2 < _l2; _i2++) {
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var group = format12.groups[_i2];
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var startId = group.startId;
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var start = group.start;
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var end = group.end;
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for (; start <= end;) {
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codes[start++] = startId++;
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}
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}
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}
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// 读取format4表
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else if (format4) {
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var segCount = format4.segCountX2 / 2;
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// graphIdArray 和idRangeOffset的偏移量
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var graphIdArrayIndexOffset = (format4.glyphIdArrayOffset - format4.idRangeOffsetOffset) / 2;
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for (var _i3 = 0; _i3 < segCount; ++_i3) {
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// 读取单个字符
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for (var _start = format4.startCode[_i3], _end = format4.endCode[_i3]; _start <= _end; ++_start) {
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// range offset = 0
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if (format4.idRangeOffset[_i3] === 0) {
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codes[_start] = (_start + format4.idDelta[_i3]) % 0x10000;
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}
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// rely on to glyphIndexArray
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else {
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var index = _i3 + format4.idRangeOffset[_i3] / 2 + (_start - format4.startCode[_i3]) - graphIdArrayIndexOffset;
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var graphId = format4.glyphIdArray[index];
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if (graphId !== 0) {
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codes[_start] = (graphId + format4.idDelta[_i3]) % 0x10000;
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} else {
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codes[_start] = 0;
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}
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}
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}
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}
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delete codes[65535];
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}
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// 读取format2表
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// see https://github.com/fontforge/fontforge/blob/master/fontforge/parsettf.c
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else if (format2) {
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var subHeadKeys = format2.subHeadKeys;
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var subHeads = format2.subHeads;
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var glyphs = format2.glyphs;
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var numGlyphs = ttf.maxp.numGlyphs;
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var _index = 0;
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for (var _i4 = 0; _i4 < 256; _i4++) {
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// 单字节编码
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if (subHeadKeys[_i4] === 0) {
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if (_i4 >= format2.maxPos) {
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_index = 0;
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} else if (_i4 < subHeads[0].firstCode || _i4 >= subHeads[0].firstCode + subHeads[0].entryCount || subHeads[0].idRangeOffset + (_i4 - subHeads[0].firstCode) >= glyphs.length) {
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_index = 0;
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} else if ((_index = glyphs[subHeads[0].idRangeOffset + (_i4 - subHeads[0].firstCode)]) !== 0) {
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_index = _index + subHeads[0].idDelta;
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}
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// 单字节解码
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if (_index !== 0 && _index < numGlyphs) {
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codes[_i4] = _index;
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}
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} else {
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var k = subHeadKeys[_i4];
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for (var j = 0, entryCount = subHeads[k].entryCount; j < entryCount; j++) {
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if (subHeads[k].idRangeOffset + j >= glyphs.length) {
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_index = 0;
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} else if ((_index = glyphs[subHeads[k].idRangeOffset + j]) !== 0) {
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_index = _index + subHeads[k].idDelta;
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}
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if (_index !== 0 && _index < numGlyphs) {
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var _unicode = (_i4 << 8 | j + subHeads[k].firstCode) % 0xffff;
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codes[_unicode] = _index;
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}
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}
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}
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}
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}
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return codes;
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} |