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<?php
/**
* @package php-font-lib
* @link https://github.com/PhenX/php-font-lib
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
/**
* `loca` font table.
*
* @package php-font-lib
*/
class Font_Table_loca extends Font_Table {
protected function _parse(){
$font = $this->getFont();
$offset = $font->pos();
$indexToLocFormat = $font->getData("head", "indexToLocFormat");
$numGlyphs = $font->getData("maxp", "numGlyphs");
$font->seek($offset);
$data = array();
// 2 bytes
if ($indexToLocFormat == 0) {
$d = $font->read(($numGlyphs + 1) * 2);
$loc = unpack("n*", $d);
for ($i = 0; $i <= $numGlyphs; $i++) {
$data[] = $loc[$i+1] * 2;
}
}
// 4 bytes
else if ($indexToLocFormat == 1) {
$d = $font->read(($numGlyphs + 1) * 4);
$loc = unpack("N*", $d);
for ($i = 0; $i <= $numGlyphs; $i++) {
$data[] = $loc[$i+1];
}
}
$this->data = $data;
}
function _encode(){
$font = $this->getFont();
$data = $this->data;
$indexToLocFormat = $font->getData("head", "indexToLocFormat");
$numGlyphs = $font->getData("maxp", "numGlyphs");
$length = 0;
// 2 bytes
if ($indexToLocFormat == 0) {
for ($i = 0; $i <= $numGlyphs; $i++) {
$length += $font->writeUInt16($data[$i] / 2);
}
}
// 4 bytes
else if ($indexToLocFormat == 1) {
for ($i = 0; $i <= $numGlyphs; $i++) {
$length += $font->writeUInt32($data[$i]);
}
}
return $length;
}
}
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