public function transform(CGImageBase $src)
{
if ($this->_angle == 0) {
return $src;
}
// nothing to do.
$type = $src['type'];
if ($this->_alpha != 0) {
$type = 'image/png';
}
if ($this->_alpha == 127) {
$this->_color = 'transparent';
}
if ($this->_color == 'transparent') {
$type = 'image/png';
}
if (!function_exists('imagerotate')) {
throw new Exception('imagerotate function not found');
}
$_dest = new CGImageBase(array($type, $src['width'], $src['height']));
if (!$this->_color || $this->_color == 'transparent') {
$tcolor = cgsi_utils::get_transparent_color($src);
} else {
list($_r, $_g, $_b) = cgsi_utils::color_to_rgb($this->_color);
$tcolor = imagecolorallocatealpha($_dest['rsrc'], $_r, $_g, $_b, $this->_alpha);
}
$res = imagerotate($src['rsrc'], $this->_angle * -1, $tcolor);
if ($res === FALSE) {
throw new Exception('Error applying filter ' . IMG_FILTER_COLORIZE);
}
imagecolortransparent($res, $tcolor);
$_dest['rsrc'] = $res;
$_dest['width'] = imagesx($res);
$_dest['height'] = imagesy($res);
return $_dest;
}
