/**
* Get encoding tables
*/
protected function getOS2Metrics()
{
$this->offset = $this->fdt['table']['OS/2']['offset'];
$this->offset += 2;
// skip version
// xAvgCharWidth
$this->fdt['AvgWidth'] = round($this->fbyte->getFWord($this->offset) * $this->fdt['urk']);
$this->offset += 2;
// usWeightClass
$usWeightClass = round($this->fbyte->getUFWord($this->offset) * $this->fdt['urk']);
// estimate StemV and StemH (400 = usWeightClass for Normal - Regular font)
$this->fdt['StemV'] = round(70 * $usWeightClass / 400);
$this->fdt['StemH'] = round(30 * $usWeightClass / 400);
$this->offset += 2;
$this->offset += 2;
// usWidthClass
$fsType = $this->fbyte->getShort($this->offset);
$this->offset += 2;
if ($fsType == 2) {
throw new FontException('This Font cannot be modified, embedded or exchanged in any manner' . ' without first obtaining permission of the legal owner.');
}
}
/**
* Add composite glyphs
*
* @param array $new_sga
* @param int $key
*
* @return array
*/
protected function findCompositeGlyphs($new_sga, $key)
{
if (isset($this->fdt['indexToLoc'][$key])) {
$this->offset = $this->fdt['table']['glyf']['offset'] + $this->fdt['indexToLoc'][$key];
$numberOfContours = $this->fbyte->getShort($this->offset);
$this->offset += 2;
if ($numberOfContours < 0) {
// composite glyph
$this->offset += 8;
// skip xMin, yMin, xMax, yMax
do {
$flags = $this->fbyte->getUShort($this->offset);
$this->offset += 2;
$glyphIndex = $this->fbyte->getUShort($this->offset);
$this->offset += 2;
if (!isset($this->subglyphs[$glyphIndex])) {
// add missing glyphs
$new_sga[$glyphIndex] = true;
}
// skip some bytes by case
if ($flags & 1) {
$this->offset += 4;
} else {
$this->offset += 2;
}
if ($flags & 8) {
$this->offset += 2;
} elseif ($flags & 64) {
$this->offset += 4;
} elseif ($flags & 128) {
$this->offset += 8;
}
} while ($flags & 32);
}
}
return $new_sga;
}