opentype.features.js/lib/opentype/src/tables/head.js

Library to list opentype fonts optional features.

"use strict";
// The `head` table contains global information about the font.
// https://www.microsoft.com/typography/OTSPEC/head.htm
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var check_1 = __importDefault(require("../check"));
var parse_1 = __importDefault(require("../parse"));
var table_1 = __importDefault(require("../table"));
// Parse the header `head` table
function parseHeadTable(data, start) {
    var head = {};
    var p = new parse_1.default.Parser(data, start);
    head.version = p.parseVersion();
    head.fontRevision = Math.round(p.parseFixed() * 1000) / 1000;
    head.checkSumAdjustment = p.parseULong();
    head.magicNumber = p.parseULong();
    check_1.default.argument(head.magicNumber === 0x5F0F3CF5, 'Font header has wrong magic number.');
    head.flags = p.parseUShort();
    head.unitsPerEm = p.parseUShort();
    head.created = p.parseLongDateTime();
    head.modified = p.parseLongDateTime();
    head.xMin = p.parseShort();
    head.yMin = p.parseShort();
    head.xMax = p.parseShort();
    head.yMax = p.parseShort();
    head.macStyle = p.parseUShort();
    head.lowestRecPPEM = p.parseUShort();
    head.fontDirectionHint = p.parseShort();
    head.indexToLocFormat = p.parseShort();
    head.glyphDataFormat = p.parseShort();
    return head;
}
function makeHeadTable(options) {
    // Apple Mac timestamp epoch is 01/01/1904 not 01/01/1970
    var timestamp = Math.round(new Date().getTime() / 1000) + 2082844800;
    var createdTimestamp = timestamp;
    if (options.createdTimestamp) {
        createdTimestamp = options.createdTimestamp + 2082844800;
    }
    return new table_1.default.Table('head', [
        { name: 'version', type: 'FIXED', value: 0x00010000 },
        { name: 'fontRevision', type: 'FIXED', value: 0x00010000 },
        { name: 'checkSumAdjustment', type: 'ULONG', value: 0 },
        { name: 'magicNumber', type: 'ULONG', value: 0x5F0F3CF5 },
        { name: 'flags', type: 'USHORT', value: 0 },
        { name: 'unitsPerEm', type: 'USHORT', value: 1000 },
        { name: 'created', type: 'LONGDATETIME', value: createdTimestamp },
        { name: 'modified', type: 'LONGDATETIME', value: timestamp },
        { name: 'xMin', type: 'SHORT', value: 0 },
        { name: 'yMin', type: 'SHORT', value: 0 },
        { name: 'xMax', type: 'SHORT', value: 0 },
        { name: 'yMax', type: 'SHORT', value: 0 },
        { name: 'macStyle', type: 'USHORT', value: 0 },
        { name: 'lowestRecPPEM', type: 'USHORT', value: 0 },
        { name: 'fontDirectionHint', type: 'SHORT', value: 2 },
        { name: 'indexToLocFormat', type: 'SHORT', value: 0 },
        { name: 'glyphDataFormat', type: 'SHORT', value: 0 }
    ], options);
}
exports.default = { parse: parseHeadTable, make: makeHeadTable };