Thumbnails

<?php
    /*******************************************************************************
    *
    *Thumb.php
    *Fonction :
    *    Propose la g\u00e9n\u00e9ration \u00e0 la vol\u00e9e d'une vignette \u00e0 partir d'un jpeg
    *    La vignette est sauvegard\u00e9e dans un sous repertoire de l'image source.
    *Necessite :
    *    GD 2
    *
    *Adapt\u00e9 de :
    *  Thumb.php de Chris Tomlinson. ctomlinson@westnet.com.au
    *    http://mightystuff.net
    *
    *Version :
    *  0.1 : 2006/06/04 -  Mise en place du code
    *  0.2 : 2006/06/05 -  Contr\u00f4le l'existence du repertoire cible
    *
    *Attributs :
    *$_GET['file'] = Chemin de l'image \u00c3  r\u00e9duire
    *$_GET['largeur'] = largeur maximale de l'image
    *$_GET['hauteur'] = largeur maximale de l'image
    *$_GET['nochache'] = supprime la vignette
    *  (0 = sauvergarder, 1=supprimer)
 
    *  -- bogue --
    *$_GET['alt'] = un filigramme
    *  -- \u00c3  developper --
 
    *$_GET['type'] = le type d'image cible
    *  (1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 
    *  7 = TIFF (Ordre des octets Intel), 8 = TIFF (Ordre des octets Motorola),
    * 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF)
    ******************************************************************************/
 
    // configuration
    $thumb['dir'] ='thumbs/';
 
    if (empty($_GET['largeur']) && empty($_GET['hauteur'])) {
        $thumb['destination']['largeur'] = 200;
    } else {
        $thumb['destination']['largeur'] = $_GET['largeur'];
        $thumb['destination']['hauteur'] = $_GET['hauteur'];
    }
 
    if (empty($_GET["quality"])) {
        $thumb['quality'] = 80;
    } else {
        $thumb['quality'] = $_GET["quality"];
    }
 
    if (empty($_GET["type"])) {
        $thumb['destination']['type'] = 2;
    } else {
        $thumb['destination']['type'] = $_GET["type"];
    }
 
    if (empty($_GET['alt'])) {
        $thumb['alt']="filigramme";
    } else {
        $thumb['alt'] = $_GET['alt'];
    }
 
    if ($_GET['nocache'] == 1) {
        $thumb['nocache'] = 1;
    } else {
        $thumb['nocache'] = 0;
    }
 
    //determine le chemin complet du serveur
    $document_root = str_replace($_SERVER["PHP_SELF"],"",__FILE__)."/";
 
    //determine le nom du fichier
    $thumb['source']['file'] = substr(strrchr ($_GET['file'],'/'),1);
    $thumb['destination']['file'] = $thumb['source']['file'];
 
    //determine le chemin source et cible de sauvegarde
    if (substr_count($_GET['file'], "http://",0)) {
        $thumb['source']['dir'] = str_replace($thumb['source']['file'],'',$_GET['file']);
        $thumb['destination']['dir'] = $document_root.$thumb['dir'];
    } else {
        $thumb['source']['dir'] = $document_root.str_replace($thumb['source']['file'],'',$_GET['file']);
        $thumb['destination']['dir'] = $thumb['source']['dir'].$thumb['dir'];
    }
 
    //memorise le chemin complet
    $thumb['source']['full_name'] = $thumb['source']['dir'].$thumb['source']['file'];
    $thumb['destination']['full_name'] = $thumb['destination']['dir'].$thumb['destination']['file'];
 
    //echo "<strong>".$thumb['source']['full_name']."</strong>";
 
 
    //teste l'existence du fichier source
    if (!file_exists($thumb['source']['full_name'])) {
        echo $thumb['source']['full_name'];
        echo "Le fichier source n'existe pas";
        exit;
    }
    //teste l'existence du chemin cible
    if (!is_dir($thumb['destination']['dir'])) {
        @mkdir($thumb['destination']['dir']);
    }
 
    //affiche directement la vignette si elle existe
    if (file_exists($thumb['destination']['full_name'])) {
        Header('Content-type: image/jpeg');
        Header("Expires: Mon, 26 Jul 2030 05:00:00 GMT");
        Header('Content-Disposition: inline; filename='.$thumb['destination']['full_name']);
        echo (join('', file($thumb['destination']['full_name'])));
        //supprime la vignette si necessaire
        if ($thumb['nocache']==1) {
            @unlink($thumb['destination']['full_name']);
        }
        exit;
    }
 
    //determine le type d'image source
    $info_source = getimagesize($thumb['source']['dir'].$thumb['source']['file']);
    $thumb['source']['largeur'] = $info_source[0];
    $thumb['source']['hauteur'] = $info_source[1];
    $thumb['source']['type'] = $info_source[2];
 
/*
    echo $thumb['destination']['full_name']."<br/>";
    echo $thumb['source']['full_name']."<br/>";
    echo $thumb['source']['type']."<br/>";
    echo "++".$thumb['source']['largeur']."--".$thumb['source']['hauteur']."<br/>";
    echo "--".$thumb['destination']['largeur']."--".$thumb['destination']['hauteur']."<br/>";
*/
 
 
    //g\u00c3\u00a9n\u00c3\u00a9re la vignette
    switch ($thumb['source']['type']) {
        case 2:        // JPG
            $thumb['source']['image'] = ImageCreateFromJPEG($thumb['source']['full_name']);
            break;
 
        case 3:        // Png
            $thumb['source']['image'] = ImageCreateFromPng($thumb['source']['full_name']);
            break;
 
 
 
        default :
            echo "Le fichier cible ne peut \u00eare cr\u00e9er";
            exit;
            break;
    }
 
    //d\u00c3\u00a9fini les dimension de la vignette
    if (empty($thumb['destination']['hauteur'])){
        $thumb['destination']['hauteur'] = $thumb['destination']['largeur'] /$thumb['source']['largeur'] * $thumb['source']['hauteur'];
    }
 
    //retaille l'image
 
    if ($thumb['source']['largeur']<2000) {
        $thumb['destination']['image'] = ImageCreateTrueColor($thumb['destination']['largeur'], $thumb['destination']['hauteur']);
        /*
        imagecopyresized(
            $thumb['destination']['image'], $thumb['source']['image'], 
            0, 0, 0, 0, 
            $thumb['destination']['largeur'], $thumb['destination']['hauteur'], $thumb['source']['largeur'], $thumb['source']['hauteur']
        );
        */
        imagecopyresampled(
            $thumb['destination']['image'], $thumb['source']['image'],
            0, 0, 0, 0, 
            $thumb['destination']['largeur'], $thumb['destination']['hauteur'], $thumb['source']['largeur'], $thumb['source']['hauteur']
        );
    } else {
        $thumb['destination']['image'] = ImageCreateTrueColor($thumb['destination']['largeur'], $thumb['destination']['hauteur']);
        imagecopyresized(
            $thumb['destination']['image'], 
            $thumb['source']['image'], 
            0, 0, 0, 0, 
            $thumb['destination']['largeur'], 
            $thumb['destination']['hauteur'], 
            $thumb['source']['largeur'], 
            $thumb['source']['hauteur']
        );
    }
 
    //ajoute un commentaire sur la vignette
    if (!empty($thumb['alt']))  {
        $font=51;
        $string= $thumb['alt'];
        $white = imagecolorallocate ($thumb['destination']['image'], 255, 255, 255);
        $black = imagecolorallocate ($thumb['destination']['image'], 0, 0, 0);
        imagestring ($thumb['destination']['image'], $font, 3, $thumb['destination']['hauteur']-9, $string, $black);
        imagestring ($thumb['destination']['image'], $font, 2, $thumb['destination']['hauteur']-10, $string, $white);
    }
 
    //g\u00c3\u00a9n\u00c3\u00a9re l'entete de fichier
    Header('Content-type: image/jpeg');
    Header("Expires: Mon, 26 Jul 2030 05:00:00 GMT");
    Header('Content-Disposition: inline; filename='.$thumb['destination']['full_name']);
 
    if ($thumb['destination']['type']==2){
        if ($thumb['nocache']== 0) {
            //sauvegarde l'image
            imagejpeg($thumb['destination']['image'],$thumb['destination']['full_name'],$thumb['quality']);
        }
        //retourne l'image sur la sortie standard
        imagejpeg($thumb['destination']['image'],'',$thumb['quality']);
    }
 
    //vide la m\u00e9oire
    imagedestroy ($thumb['source']['image']);
    imagedestroy ($thumb['destination']['image']);
 
?>