magna

February 12, 2011, February 12, 2011 16:01, permalink

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<?php

private function sanitizeImageSizeInput(&$dimN, $dimO) {
	
	if (strpos($dimN, '%') !== false) {
		$perc = str_replace('%', '', $dimN);
		$dimN = $dimO * ($perc / 100);
	} else if (strpos($dimN, 'px') !== false) {
		$dimN = str_replace('px', '', $dimN);
	} else if (!is_numeric($dimN)) {
		$dimN = 0;
	}

} 

/**
 * Resize the image that was just uploaded, or one specified.
 * $nw/$nh can be specified numerically (which will be used a pixel value),
 * a string with % or px, or as NULL to cause that value to be set
 * proportionately to the other.
 * 
 * @param numeric $ or string $nw
 * @param numeric $ or string $nh
 * @param string $source 
 * @param string $copyTo 
 * @return boolean 
 */
public function resizeImage($nw, $nh, $source=null, $copyTo=null) {

	// GENERATES SLIGHT BLURINESS IN THE IMAGE.
	// Tried imageconvolution with a sharp filter, but didnt seem to help much.
	if ($source == null)
		$source = $this->uploadedfile;

	$iData = getimagesize($source);
	$mime = $iData['mime'];
	list($w, $h, $t) = $iData;
	
 	// what about image/pjpeg or image/x-windows-bmp?
 	// wouldn't it be nicer to use $t instead?
	$valid_mimes = array('image/jpeg', 'image/png', 'image/bmp', 'image/gif');
	if (!in_array($mime, $valid_mimes)) {
		error('Allowed filetypes: jpeg, png, bmp or gif');
		return false;
	} 

	if ($nw == null && $nh == null) {
		// don't forget this case!
		error('neither with nor height were given');
		return false;
	} else if ($nw != null && $nh == null) {
		// only manip W
		sanitizeImageSizeInput($nw, $w);
		$nh = ($nw / $w) * $h;
	} else if ($nw == null && $nh != null) {
		// only manip H
		sanitizeImageSizeInput($nh, $h);
		$nw = ($nh / $h) * $w;
	} else if ($nw != null && $nh != null) {
		// both values are specified
		// TODO beware, this will kill the proportions.
		// should we build in a "sanity check"?
		sanitizeImageSizeInput($nw, $w);
		sanitizeImageSizeInput($nh, $h);
	} 

	$dimg = imagecreatetruecolor($nw, $nh);
	$product = null == $copyTo ? $source : $copyTo;

	switch ($mime) {
		case 'image/jpeg':
			$old = imagecreatefromjpeg($source);
			$commit = function () {
				imagejpeg($dimg, $product, 100);
			};
			break;
		case 'image/png':
			$old = imagecreatefrompng($source);
			$commit = function () {
				imagepng($dimg, $product);
			};
			break;
		case 'image/gif':
			$old = imagecreatefromgif($source);
			$commit = function () {
				imagegif($dimg, $product);
			};
			break;
		case 'image/bmp':
			$old = imagecreatefrombmp($source);
			$commit = function () {
				// we will change bmp to png
				imagepng($dimg, $product);
			};
			break;
		default:
			error('Allowed filetypes: jpeg, png, bmp or gif');
			return false;
	}
	// what happens to $commit?

	imagecopyresampled($dimg, $old, 0, 0, 0, 0, $nw, $nh, $w, $h);
	imagedestroy($old);

	if ($commit) {
		imagedestroy($dimg);
		return true;
	} else {
		imagedestroy($dimg);
		return false;
	}
	
	// why not just
	// imagedestroy($dimg);
	// return $commit ? true : false;

}

?>