/**
* Scales an image down to smaller than the max_width and max_height.
* You cannot scale an image to a higher resolution.
*/
public static function scaleImage($source_dir, $dest_dir, $max_width, $max_height)
{
if (empty($max_width) || empty($max_height)) {
return false;
}
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
copy(PHPWS_SOURCE_DIR . 'core/img/nogd.png', $dest_dir);
return true;
}
}
$size = getimagesize($source_dir);
if (empty($size)) {
return false;
}
$width =& $size[0];
$height =& $size[1];
$file_type =& $size['mime'];
// if image is already smaller than the limits, just copy it
if ($width <= $max_width && $height <= $max_height) {
if ($source_dir != $dest_dir) {
return copy($source_dir, $dest_dir);
} else {
return true;
}
}
$diff = PHPWS_File::getDiff($width, $max_width, $height, $max_height);
$new_width = round($width * $diff);
$new_height = round($height * $diff);
if ($new_width > $max_width || $new_height > $max_height) {
$diff = PHPWS_File::getDiff($new_width, $max_width, $new_height, $max_height);
$new_width = round($width * $diff);
$new_height = round($height * $diff);
}
if ($new_width > $max_width || $new_height > $max_height) {
$new_width = round($new_width * $diff);
$new_height = round($new_height * $diff);
}
$source_image = PHPWS_File::_imageCopy($source_dir, $file_type);
$resampled_image = PHPWS_File::_resampleImage($new_width, $new_height);
imagecopyresampled($resampled_image, $source_image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagedestroy($source_image);
$result = PHPWS_File::_writeImageCopy($resampled_image, $dest_dir, $file_type);
if (!$result) {
imagedestroy($resampled_image);
return false;
}
chmod($dest_dir, 0644);
imagedestroy($resampled_image);
return true;
}