/**
* Extract data from a JPEG image
*
* @param string $data Image raw data
*
* @return array Image raw data array
*/
public function getData($data)
{
$data['filter'] = 'DCTDecode';
$data['data'] = $data['raw'];
$byte = new Byte($data['raw']);
// extract embedded ICC profile (if any)
$icc = array();
$offset = 0;
while (($pos = strpos($data['raw'], 'ICC_PROFILE' . "", $offset)) !== false) {
// get ICC sequence length
$length = $byte->getUShort($pos - 2) - 16;
// marker sequence number
$msn = max(1, ord($data['raw'][$pos + 12]));
// number of markers (total of APP2 used)
//$nom = max(1, ord($data['raw'][($pos + 13)]));
// get sequence segment
$icc[$msn - 1] = substr($data['raw'], $pos + 14, $length);
// move forward to next sequence
$offset = $pos + 14 + $length;
}
// order and compact ICC segments
if (count($icc) > 0) {
ksort($icc);
$icc = implode('', $icc);
if (substr($icc, 36, 4) == 'acsp') {
// valid ICC profile
$data['icc'] = $icc;
}
}
return $data;
}
/**
* Get font widths
*/
protected function getWidths()
{
// create widths array
$chw = array();
$this->offset = $this->fdt['table']['hmtx']['offset'];
for ($i = 0; $i < $this->fdt['numHMetrics']; ++$i) {
$chw[$i] = round($this->fbyte->getUFWord($this->offset) * $this->fdt['urk']);
$this->offset += 4;
// skip lsb
}
if ($this->fdt['numHMetrics'] < $this->fdt['numGlyphs']) {
// fill missing widths with the last value
$chw = array_pad($chw, $this->fdt['numGlyphs'], $chw[$this->fdt['numHMetrics'] - 1]);
}
$this->fdt['MissingWidth'] = $chw[0];
$this->fdt['cw'] = '';
$this->fdt['cbbox'] = '';
for ($cid = 0; $cid <= 65535; ++$cid) {
if (isset($this->fdt['ctgdata'][$cid])) {
if ($cid >= 0 && isset($chw[$this->fdt['ctgdata'][$cid]])) {
$this->fdt['cw'] .= ',"' . $cid . '":' . $chw[$this->fdt['ctgdata'][$cid]];
}
if (isset($this->fdt['indexToLoc'][$this->fdt['ctgdata'][$cid]])) {
$this->offset = $this->fdt['table']['glyf']['offset'] + $this->fdt['indexToLoc'][$this->fdt['ctgdata'][$cid]];
$xMin = round($this->fbyte->getFWord($this->offset + 2) * $this->fdt['urk']);
$yMin = round($this->fbyte->getFWord($this->offset + 4) * $this->fdt['urk']);
$xMax = round($this->fbyte->getFWord($this->offset + 6) * $this->fdt['urk']);
$yMax = round($this->fbyte->getFWord($this->offset + 8) * $this->fdt['urk']);
$this->fdt['cbbox'] .= ',"' . $cid . '":[' . $xMin . ',' . $yMin . ',' . $xMax . ',' . $yMax . ']';
}
}
}
}
/**
* 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;
}
/**
* Get the font type
*
* @param string $font_type Font type. Leave empty for autodetect mode.
*
* @return string
*/
protected function getFontType($font_type)
{
// autodetect font type
if (empty($font_type)) {
if (substr($this->font, 0, 16) == 'StartFontMetrics') {
// AFM type - we use this type only for the 14 Core fonts
return 'Core';
}
if (substr($this->font, 0, 4) == 'OTTO') {
throw new FontException('Unsupported font format: OpenType with CFF data');
}
if ($this->fbyte->getULong(0) == 0x10000) {
return 'TrueTypeUnicode';
}
return 'Type1';
}
if (strpos($font_type, 'CID0') === 0) {
return 'cidfont0';
}
if (in_array($font_type, array('Core', 'Type1', 'TrueType', 'TrueTypeUnicode'))) {
return $font_type;
}
throw new FontException('unknown or unsupported font type: ' . $font_type);
}
/**
* Extract the iCCP chunk data
*
* @param Byte $byte Byte class object
* @param string $data Image raw data
* @param int $offset Current byte offset
* @param int $len NUmber of bytes in this chunk
*
* @return array Image raw data array
*/
protected function getIccpChunk($byte, $data, &$offset, $len)
{
// skip profile name
$pos = 0;
while ($byte->getByte($offset++) != 0 && $pos < 80) {
++$pos;
}
// get compression method
if ($byte->getByte($offset++) != 0) {
// @codeCoverageIgnoreStart
throw new ImageException('Unknown filter method');
// @codeCoverageIgnoreEnd
}
// read ICC Color Profile
$len -= $pos + 2;
$data['icc'] = gzuncompress(substr($data['raw'], $offset, $len));
$offset += $len;
$offset += 4;
return $data;
}
