'use strict'; // See documentation here: http://www.microsoft.com/typography/otspec/head.htm var ByteBuffer = require('microbuffer'); function dateToUInt64(date) { var startDate = new Date('1904-01-01T00:00:00.000Z'); return Math.floor((date - startDate) / 1000); } function createHeadTable(font) { var buf = new ByteBuffer(54); // fixed table length buf.writeInt32(0x10000); // version buf.writeInt32(font.revision * 0x10000); // fontRevision buf.writeUint32(0); // checkSumAdjustment buf.writeUint32(0x5F0F3CF5); // magicNumber // FLag meanings: // Bit 0: Baseline for font at y=0; // Bit 1: Left sidebearing point at x=0; // Bit 3: Force ppem to integer values for all internal scaler math; may use fractional ppem sizes if this bit is clear; buf.writeUint16(0x000B); // flags buf.writeUint16(font.unitsPerEm); // unitsPerEm buf.writeUint64(dateToUInt64(font.createdDate)); // created buf.writeUint64(dateToUInt64(font.modifiedDate)); // modified buf.writeInt16(font.xMin); // xMin buf.writeInt16(font.yMin); // yMin buf.writeInt16(font.xMax); // xMax buf.writeInt16(font.yMax); // yMax buf.writeUint16(font.macStyle); //macStyle buf.writeUint16(font.lowestRecPPEM); // lowestRecPPEM buf.writeInt16(2); // fontDirectionHint buf.writeInt16(font.ttf_glyph_size < 0x20000 ? 0 : 1); // indexToLocFormat, 0 for short offsets, 1 for long offsets buf.writeInt16(0); // glyphDataFormat return buf; } module.exports = createHeadTable;