63 lines
1.6 KiB
Plaintext
63 lines
1.6 KiB
Plaintext
/**
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* @file 解析cff字符集
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* @author mengke01(kekee000@gmail.com)
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*/
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import getCFFString from './getCFFString';
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/**
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* 解析cff字形名称
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* See Adobe TN #5176 chapter 13, "Charsets".
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*
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* @param {Reader} reader 读取器
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* @param {number} start 起始偏移
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* @param {number} nGlyphs 字形个数
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* @param {Object} strings cff字符串字典
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* @return {Array} 字符集
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*/
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export default function parseCFFCharset(reader, start, nGlyphs, strings) {
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if (start) {
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reader.seek(start);
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}
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let i;
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let sid;
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let count;
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// The .notdef glyph is not included, so subtract 1.
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nGlyphs -= 1;
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const charset = ['.notdef'];
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const format = reader.readUint8();
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if (format === 0) {
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for (i = 0; i < nGlyphs; i += 1) {
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sid = reader.readUint16();
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charset.push(getCFFString(strings, sid));
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}
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}
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else if (format === 1) {
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while (charset.length <= nGlyphs) {
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sid = reader.readUint16();
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count = reader.readUint8();
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for (i = 0; i <= count; i += 1) {
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charset.push(getCFFString(strings, sid));
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sid += 1;
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}
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}
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}
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else if (format === 2) {
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while (charset.length <= nGlyphs) {
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sid = reader.readUint16();
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count = reader.readUint16();
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for (i = 0; i <= count; i += 1) {
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charset.push(getCFFString(strings, sid));
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sid += 1;
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}
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}
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}
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else {
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throw new Error('Unknown charset format ' + format);
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}
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return charset;
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}
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