155 lines
5.3 KiB
Plaintext
155 lines
5.3 KiB
Plaintext
/**
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* @file post 表
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* @author mengke01(kekee000@gmail.com)
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*
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* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6post.html
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*/
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import table from './table';
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import struct from './struct';
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import string from '../util/string';
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import unicodeName from '../enum/unicodeName';
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const Posthead = table.create(
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'posthead',
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[
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['format', struct.Fixed],
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['italicAngle', struct.Fixed],
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['underlinePosition', struct.Int16],
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['underlineThickness', struct.Int16],
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['isFixedPitch', struct.Uint32],
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['minMemType42', struct.Uint32],
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['maxMemType42', struct.Uint32],
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['minMemType1', struct.Uint32],
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['maxMemType1', struct.Uint32]
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]
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);
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export default table.create(
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'post',
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[],
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{
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read(reader, ttf) {
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const format = reader.readFixed(this.offset);
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// 读取表头
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const tbl = new Posthead(this.offset).read(reader, ttf);
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// format2
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if (format === 2) {
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const numberOfGlyphs = reader.readUint16();
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const glyphNameIndex = [];
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for (let i = 0; i < numberOfGlyphs; ++i) {
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glyphNameIndex.push(reader.readUint16());
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}
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const pascalStringOffset = reader.offset;
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const pascalStringLength = ttf.tables.post.length - (pascalStringOffset - this.offset);
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const pascalStringBytes = reader.readBytes(reader.offset, pascalStringLength);
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tbl.nameIndex = glyphNameIndex; // 设置glyf名字索引
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tbl.names = string.getPascalString(pascalStringBytes); // glyf名字数组
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}
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// deprecated
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else if (format === 2.5) {
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tbl.format = 3;
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}
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return tbl;
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},
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write(writer, ttf) {
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const post = ttf.post || {
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format: 3
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};
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// write header
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writer.writeFixed(post.format); // format
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writer.writeFixed(post.italicAngle || 0); // italicAngle
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writer.writeInt16(post.underlinePosition || 0); // underlinePosition
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writer.writeInt16(post.underlineThickness || 0); // underlineThickness
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writer.writeUint32(post.isFixedPitch || 0); // isFixedPitch
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writer.writeUint32(post.minMemType42 || 0); // minMemType42
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writer.writeUint32(post.maxMemType42 || 0); // maxMemType42
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writer.writeUint32(post.minMemType1 || 0); // minMemType1
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writer.writeUint32(post.maxMemType1 || 0); // maxMemType1
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// version 3 不设置post信息
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if (post.format === 2) {
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const numberOfGlyphs = ttf.glyf.length;
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writer.writeUint16(numberOfGlyphs); // numberOfGlyphs
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// write glyphNameIndex
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const nameIndex = ttf.support.post.nameIndex;
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for (let i = 0, l = nameIndex.length; i < l; i++) {
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writer.writeUint16(nameIndex[i]);
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}
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// write names
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ttf.support.post.names.forEach((name) => {
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writer.writeBytes(name);
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});
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}
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},
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size(ttf) {
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const numberOfGlyphs = ttf.glyf.length;
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ttf.post = ttf.post || {};
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ttf.post.format = ttf.post.format || 3;
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ttf.post.maxMemType1 = numberOfGlyphs;
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// version 3 不设置post信息
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if (ttf.post.format === 3 || ttf.post.format === 1) {
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return 32;
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}
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// version 2
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let size = 34 + numberOfGlyphs * 2; // header + numberOfGlyphs + numberOfGlyphs * 2
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const glyphNames = [];
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const nameIndexArr = [];
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let nameIndex = 0;
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// 获取 name的大小
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for (let i = 0; i < numberOfGlyphs; i++) {
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// .notdef
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if (i === 0) {
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nameIndexArr.push(0);
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}
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else {
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const glyf = ttf.glyf[i];
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const unicode = glyf.unicode ? glyf.unicode[0] : 0;
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const unicodeNameIndex = unicodeName[unicode];
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if (undefined !== unicodeNameIndex) {
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nameIndexArr.push(unicodeNameIndex);
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}
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else {
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// 这里需要注意，"" 有可能是"\3" length不为0，但是是空字符串
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const name = glyf.name;
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if (!name || name.charCodeAt(0) < 32) {
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nameIndexArr.push(258 + nameIndex++);
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glyphNames.push([0]);
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size++;
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}
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else {
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nameIndexArr.push(258 + nameIndex++);
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const bytes = string.toPascalStringBytes(name); // pascal string bytes
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glyphNames.push(bytes);
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size += bytes.length;
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}
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}
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}
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}
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ttf.support.post = {
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nameIndex: nameIndexArr,
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names: glyphNames
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};
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return size;
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}
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}
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);
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