images.php

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<?php
// This file should be in UTF8 without BOM - Accents examples: éèê
// +----------------------------------------------------------------------+
// | Copyright (c) 2004-2015 Advisto SAS, service PEEL - contact@peel.fr  |
// +----------------------------------------------------------------------+
// | This file is part of PEEL Shopping 8.0.0, which is subject to an   |
// | opensource GPL license: you are allowed to customize the code           |
// | for your own needs, but must keep your changes under GPL                |
// | More information: https://www.peel.fr/lire/licence-gpl-70.html          |
// +----------------------------------------------------------------------+
// | Author: Advisto SAS, RCS 479 205 452, France, https://www.peel.fr/      |
// +----------------------------------------------------------------------+
// $Id: images.php 46935 2015-09-18 08:49:48Z gboussin $
if (!defined('IN_PEEL')) {
     die();
}

function image_resize($origin_filename_with_path, $new_filename_with_path, $destinationW = null, $destinationH = null, $resize_even_if_smaller = false, $allow_keep_origin_file_if_resize_not_needed = true, $filesize_limit_keep_origin_file = 102400, $jpeg_quality = 85, $gammacorrect = 1.0)
{
     $origin_file_extension = pathinfo($origin_filename_with_path, PATHINFO_EXTENSION);
     if (String::strtolower($origin_file_extension) === 'png' && function_exists('imagecreatefrompng')) {
          $source = @imagecreatefrompng($origin_filename_with_path);
     } elseif (String::strtolower($origin_file_extension) === 'gif' && function_exists('imagecreatefromgif')) {
          $source = @imagecreatefromgif($origin_filename_with_path);
     }
     if (empty($source) && function_exists('imagecreatefromjpeg')) {
          // On essaie quoiqu'il arrive de décoder en JPEG
          $source = @imagecreatefromjpeg($origin_filename_with_path);
          if (empty($source)) {
               $source = @imagecreatefrompng($origin_filename_with_path);
          }
     }
     if (empty($source)) {
          return false;
     }
     $sourceW = @imagesx($source);
     $sourceH = @imagesy($source);
     if (empty($sourceW) || empty($sourceH)) {
          return false;
     }
     // Zoom par défaut si l'image est plus petite que la limite $image_max_width x $image_max_height
     $default_zoom = 1;

     if ((!empty($destinationW) && $sourceW * $default_zoom > $destinationW) || (!empty($destinationH) && $sourceH * $default_zoom > $destinationH) || ((!empty($destinationW) || !empty($destinationH)) && $resize_even_if_smaller)) {
          if(empty($destinationW)){
               $destinationW = $sourceW;
          }
          if(empty($destinationH)){
               $destinationH = $sourceH;
          }
          if ($sourceH * $destinationW > $destinationH * $sourceW) {
               // on met au même format que celui de la taille demandée
               $destinationW = ($sourceW * $destinationH) / $sourceH;
          } else {
               $destinationH = ($sourceH * $destinationW) / $sourceW;
          }
     } else {
          $destinationW = $sourceW * $default_zoom;
          $destinationH = $sourceH * $default_zoom;
     }
     if ($destinationW != $sourceW || $destinationH != $sourceH || !$allow_keep_origin_file_if_resize_not_needed || filesize($origin_filename_with_path) > $filesize_limit_keep_origin_file || abs(1-$gammacorrect)>=0.1) {
          // On crée la nouvelle image seulement si c'est nécessaire, pour ne pas perdre en qualité
          $im = imagecreatetruecolor($destinationW, $destinationH);
          // Pour éviter les bordures noires : on remplit de blanc le bord
          $bg = imagecolorallocate($im, 255, 255, 255);
          imagefill($im, 0, 0, $bg);
          // On fait la copie en redimensionnant
          imagecopyresampled($im, $source, 0, 0, 0, 0, $destinationW, $destinationH, $sourceW, $sourceH);
          imagedestroy($source);
          if (abs(1-$gammacorrect)>=0.1) {
               imagegammacorrect ($im, 1.0, $gammacorrect);
          }
          if (!imagejpeg($im, $new_filename_with_path, $jpeg_quality)) {
               return false;
          }
          imagedestroy($im);
          if ($new_filename_with_path != $origin_filename_with_path) {
               unlink($origin_filename_with_path);
          }
          return $new_filename_with_path;
     } else {
          imagedestroy($source);
          return $origin_filename_with_path;
     }
}