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