<?php
/***** arguments pour charger la page: image.php?file=imagefileURL&type=format&w=largeur&h=hauteur&title=titre&align=alignementX&valign=alignementY ******/
$f = $_GET['file'];
$dst = $_GET['dst'];
$GLOBALS['titlefont'] = 5;

/** retourne les nouvelles dimensions de l'image ajustŽe aux dimensions originales (pas de distortions)*/
function getSize($im) {
	if(isset($_GET['w'])) $w = $_GET['w'];
	if(isset($_GET['h'])) $h = $_GET['h'];
	if(!isset($w) || $w == 0) $w = imagesx($im)/imagesy($im) * $h;
	if(!isset($h) || $h == 0) $h = imagesy($im)/imagesx($im) * $w;
	if($w == 0 && $h == 0) { $w = imagesx($im); $h = imagesy($im); }
	return array($w,$h);
}

/** applique le copyright */
function copyright(&$im) {
	$str = "(c) b23:production ".date('Y');
	$font = 2; $inset = 1; $color = imagecolorallocatealpha($im, 255,50,0,50);
	$s = getSize($im); $x = $s[0] - imagefontwidth($font) * ($inset + strlen($str)); $y = $s[1] - imagefontheight($font) * $inset;
	imagestring($im, $font, $x, $y, $str, $color);
}
/** applique un titre */
function title(&$im, $title, $align = "left", $valign = "center") {
	$font = $GLOBALS['titlefont']; $inset = 2; $color = imagecolorallocatealpha($im, 255,50,0,20);
	$s = getSize($im); 
	switch($align) {
		case "left": 
			$x = imagefontwidth($font) * ($inset);
			break;
		case "right":
			$x = $s[0] - imagefontwidth($font) * ($inset + strlen($title));
			break;
		case "center":
			$x = intval($s[0]/2) - imagefontwidth($font) * intval(strlen($title)/2);
			break;
		default: $x = imagefontwidth($font) * ($inset);
	}
	switch($valign) {
		case "top":
			$y = imagefontheight($font) * $inset;
			break;
		case "bottom":
			$y = $s[1] - imagefontheight($font) * $inset;
			break;
		case "center":
			$y = intval($s[1]/2) - intval(imagefontheight($font)/2);
			break;
		default: $y = $s[1] - imagefontheight($font) * $inset;
	}
	imagestring($im, $font, $x, $y, $title, $color);
}

// les formats supportŽs par php 4 et 5
if (function_exists("imagegif") && $_GET['type'] == 'gif') {
	$im = imagecreatefromgif($f);
	$s = getSize($im); $im_r = imagecreatetruecolor($s[0], $s[1]);	
        $trans = imagecolortransparent($im); //imagecolorallocatealpha($im_r,0,0,0,127); 
        imagecolortransparent($im_r, $trans); 
	imagecopyresampled($im_r, $im, 0, 0, 0, 0, $s[0], $s[1], imagesx($im), imagesy($im)); // imagesavealpha($im_r, true);
	if(isset($_GET['title'])) title($im_r, $_GET['title'], $_GET['align'], $_GET['valign']);
	copyright($im_r);
	header("Content-type: image/gif");
	imagegif($im_r,$dst);
}
elseif (function_exists("imagejpeg") && $_GET['type'] == 'jpeg') {
	$im = imagecreatefromjpeg($f);
	$s = getSize($im); $im_r = imagecreatetruecolor($s[0], $s[1]);
        $trans = imagecolortransparent($im); //imagecolorallocatealpha($im_r,0,0,0,127); 
        imagecolortransparent($im_r, $trans); 
	imagecopyresampled($im_r, $im, 0, 0, 0, 0, $s[0], $s[1], imagesx($im), imagesy($im));	
	if(isset($_GET['title'])) title($im_r, $_GET['title'], $_GET['align'], $_GET['valign']);
	copyright($im_r);	
	header("Content-type: image/jpeg");
	imagejpeg($im_r, $dst, 80);
}
elseif (function_exists("imagepng") && $_GET['type'] == 'png') {
	$im = imagecreatefrompng($f);
	$s = getSize($im); $im_r = imagecreatetruecolor($s[0], $s[1]);
        $trans = imagecolortransparent($im); //imagecolorallocatealpha($im_r,0,0,0,127); 
        imagecolortransparent($im_r, $trans); 
	imagecopyresampled($im_r, $im, 0, 0, 0, 0, $s[0], $s[1], imagesx($im), imagesy($im));	
	if(isset($_GET['title'])) title($im_r, $_GET['title'], $_GET['align'], $_GET['valign']);
	copyright($im_r);
	header("Content-type: image/png");
	imagepng($im_r,$dst);
} elseif (function_exists("imagewbmp") && $_GET['type'] == 'wbmp') {
	$im = imagecreatefrowbmp($f);
	$s = getSize($im); $im_r = imagecreatetruecolor($s[0], $s[1]);
        $trans = imagecolortransparent($im); //imagecolorallocatealpha($im_r,0,0,0,127); 
        imagecolortransparent($im_r, $trans); 
	imagecopyresampled($im_r, $im, 0, 0, 0, 0, $s[0], $s[1], imagesx($im), imagesy($im));	
	if(isset($_GET['title'])) title($im_r, $_GET['title'], $_GET['align'], $_GET['valign']);
	copyright($im_r);
	header("Content-type: image/vnd.wap.wbmp");
	imagewbmp($im_r,$dst);
}  else {
	die("Pas de support graphique avec PHP sur ce serveur");
 }  imagedestroy($im_r);
?>