private function resample(&$img, ImageManipulator $source, $owdt, $ohgt, $maxwdt, $maxhgt, $quality = 1)
{
// make sure the image doesn't get enlarged
$maxwdt = min($maxwdt, $owdt);
$maxhgt = min($maxhgt, $ohgt);
if (!$maxwdt) {
$divwdt = 1;
} else {
$divwdt = max(1, $owdt / $maxwdt);
}
if (!$maxhgt) {
$divhgt = 1;
} else {
$divhgt = max(1, $ohgt / $maxhgt);
}
if ($divwdt >= $divhgt) {
$newwdt = round($owdt / $divwdt);
$newhgt = round($ohgt / $divwdt);
} else {
$newhgt = round($ohgt / $divhgt);
$newwdt = round($owdt / $divhgt);
}
// return same image if resizing is not necessary
if ($newwdt == $owdt && $newhgt == $ohgt) {
return false;
}
$tn = imagecreatetruecolor($newwdt, $newhgt);
if (in_array($source->getType(), array(IMAGETYPE_GIF, IMAGETYPE_PNG))) {
$trnprt_indx = imagecolortransparent($img);
// If we have a specific transparent color
if ($trnprt_indx >= 0) {
// Get the original image's transparent color's RGB values
$trnprt_color = imagecolorsforindex($img, $trnprt_indx);
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($tn, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
// Completely fill the background of the new image with allocated color.
imagefill($tn, 0, 0, $trnprt_indx);
// Set the background color for new image to transparent
imagecolortransparent($tn, $trnprt_indx);
} elseif ($source->getType() == IMAGETYPE_PNG) {
// Turn off transparency blending (temporarily)
imagealphablending($tn, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($tn, 0, 0, 0, 127);
// Completely fill the background of the new image with allocated color.
imagefill($tn, 0, 0, $color);
// Restore transparency blending
imagesavealpha($tn, true);
}
}
if ($quality) {
imagecopyresampled($tn, $img, 0, 0, 0, 0, $newwdt, $newhgt, $owdt, $ohgt);
} else {
imagecopyresized($tn, $img, 0, 0, 0, 0, $newwdt, $newhgt, $owdt, $ohgt);
}
imagedestroy($img);
$img = $tn;
return array($newwdt, $newhgt);
}
