/**
* TODO: cache results; replace makefont with this utility
*/
function _read($file, $encoding)
{
error_log(sprintf("Parsing font file file %s for encoding %s", $file, $encoding));
$font = new OpenTypeFile();
$font->open($file);
$hhea = $font->getTable('hhea');
$head = $font->getTable('head');
$hmtx = $font->getTable('hmtx');
$post = $font->getTable('post');
$cmap = $font->getTable('cmap');
$subtable = $cmap->findSubtable(OT_CMAP_PLATFORM_WINDOWS, OT_CMAP_PLATFORM_WINDOWS_UNICODE);
/**
* Read character widths for selected encoding
*/
$widths = array();
$manager = ManagerEncoding::get();
$map = $manager->getEncodingVector($encoding);
foreach ($map as $code => $ucs2) {
$glyphIndex = $subtable->lookup($ucs2);
if (!is_null($glyphIndex)) {
$widths[$code] = floor($hmtx->_hMetrics[$glyphIndex]['advanceWidth'] * 1000 / $head->_unitsPerEm);
} else {
$widths[$code] = DEFAULT_CHAR_WIDTH;
}
}
// Fill unknown characters with the default char width
for ($i = 0; $i < 256; $i++) {
if (!isset($widths[chr($i)])) {
$widths[chr($i)] = DEFAULT_CHAR_WIDTH;
}
}
$this->ascender = floor($hhea->_ascender * 1000 / $head->_unitsPerEm);
$this->descender = floor($hhea->_descender * 1000 / $head->_unitsPerEm);
$this->bbox = array($head->_xMin * 1000 / $head->_unitsPerEm, $head->_yMin * 1000 / $head->_unitsPerEm, $head->_xMax * 1000 / $head->_unitsPerEm, $head->_yMax * 1000 / $head->_unitsPerEm);
$this->underline_position = floor($post->_underlinePosition * 1000 / $head->_unitsPerEm);
$this->underline_thickness = floor($post->_underlineThickness * 1000 / $head->_unitsPerEm);
$this->char_widths = $widths;
$font->close();
}
/**
* @return Array font metrics hash or null of TTF file could not be parsed
*/
function ReadTTF($fontfile, $map)
{
if (!is_readable($fontfile)) {
return null;
}
/**
* Open font file and read metrics information
*/
$font = new OpenTypeFile();
$font->open($fontfile);
$head =& $font->getTable('head');
$name =& $font->getTable('name');
$cmap =& $font->getTable('cmap');
$hmtx =& $font->getTable('hmtx');
$hhea =& $font->getTable('hhea');
$post =& $font->getTable('post');
$subtable =& $cmap->findSubtable(OT_CMAP_PLATFORM_WINDOWS, OT_CMAP_PLATFORM_WINDOWS_UNICODE);
/**
* Prepare initial data
*/
$widths = array();
for ($i = 0; $i < 256; $i++) {
$code = chr($i);
if (!isset($map[$code])) {
$widths[] = 1000;
continue;
}
$ucs2 = $map[$code];
/**
* If the font is monospaced, only one entry need be in the array,
* but that entry is required. The last entry applies to all
* subsequent glyphs.
*/
$glyphIndex = $subtable->lookup($ucs2);
if (!is_null($glyphIndex)) {
$realIndex = min($glyphIndex, $hhea->_numberOfHMetrics - 1);
$widths[] = floor($hmtx->_hMetrics[$realIndex]['advanceWidth'] * 1000 / $head->_unitsPerEm);
} else {
$widths[] = 1000;
}
}
$font_info = array();
/**
* Here we use a hack; as, acording to OT specifications,
*
* When translated to ASCII, these [...] strings must be
* identical; no longer than 63 characters; and restricted to the
* printable ASCII subset, codes 33 through 126, except for the 10
* characters: '[', ']', '(', ')', '{', '}', '<', '>', '/', '%'.
*
* we can assume that UCS-2 encoded string we receive can be easily
* translated to ASCII by removing the high-byte of all two-byte characters
*/
$ps_name_ucs2 = $name->lookup(OT_CMAP_PLATFORM_WINDOWS, OT_CMAP_PLATFORM_WINDOWS_UNICODE, OT_CMAP_LANGUAGE_WINDOWS_ENGLISH_AMERICAN, OT_NAME_ID_POSTSCRIPT_NAME);
$ps_name_ascii = "";
for ($i = 0; $i < strlen($ps_name_ucs2); $i += 2) {
$ps_name_ascii .= $ps_name_ucs2[$i + 1];
}
$font_info['FontName'] = $ps_name_ascii;
$font_info['Weight'] = $name->lookup(null, null, null, OT_NAME_ID_SUBFAMILY_NAME);
$font_info['ItalicAngle'] = $post->_italicAngle;
$font_info['IsFixedPitch'] = (bool) $post->_isFixedPitch;
// $font_info['CapHeight']
// $font_info['StdVW']
$font_info['Ascender'] = floor($hhea->_ascender * 1000 / $head->_unitsPerEm);
$font_info['Descender'] = floor($hhea->_descender * 1000 / $head->_unitsPerEm);
$font_info['UnderlineThickness'] = floor($post->_underlineThickness * 1000 / $head->_unitsPerEm);
$font_info['UnderlinePosition'] = floor($post->_underlinePosition * 1000 / $head->_unitsPerEm);
$font_info['FontBBox'] = array($head->_xMin * 1000 / $head->_unitsPerEm, $head->_yMin * 1000 / $head->_unitsPerEm, $head->_xMax * 1000 / $head->_unitsPerEm, $head->_yMax * 1000 / $head->_unitsPerEm);
$font_info['Widths'] = $widths;
$font->_delete();
unset($font);
return $font_info;
}
