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'use strict';
// See documentation here: http://www.microsoft.com/typography/otspec/loca.htm
var _ = require('lodash');
var ByteBuffer = require('microbuffer');
function tableSize(font, isShortFormat) {
var result = (font.glyphs.length + 1) * (isShortFormat ? 2 : 4); // by glyph count + tail
return result;
}
function createLocaTable(font) {
var isShortFormat = font.ttf_glyph_size < 0x20000;
var buf = new ByteBuffer(tableSize(font, isShortFormat));
var location = 0;
// Array of offsets in GLYF table for each glyph
_.forEach(font.glyphs, function (glyph) {
if (isShortFormat) {
buf.writeUint16(location);
location += glyph.ttf_size / 2; // actual location must be divided to 2 in short format
} else {
buf.writeUint32(location);
location += glyph.ttf_size; //actual location is stored as is in long format
}
});
// The last glyph location is stored to get last glyph length
if (isShortFormat) {
buf.writeUint16(location);
} else {
buf.writeUint32(location);
}
return buf;
}
module.exports = createLocaTable;