function createHeadTable(font) {
var buf = new jDataView(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;
}
this.channels.forEach(function(channel, index) {
// id
var id = (that.hasAlpha && index === numChannel - 1) ? -1 : index;
layerRecord.writeInt16(id);
// length
var channelByteLength = channel.toBinary().byteLength;
layerRecord.writeUint32(channelByteLength);
});