images.lib.php

Go to the documentation of this file.

<?php
/* Copyright (C) 2004-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
 * Copyright (C) 2005-2007 Regis Houssin        <regis.houssin@inodbox.com>
 * Copyright (C) 2024   MDW             <mdeweerd@users.noreply.github.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 * or see https://www.gnu.org/
 */
 
// Define size of logo small and mini
// TODO Remove this and call getDefaultImageSizes() instead
$maxwidthsmall = 480;
$maxheightsmall = 270; // Near 16/9eme
$maxwidthmini = 128;
$maxheightmini = 72; // 16/9eme
$quality = 80;
 
if (!defined('IMAGETYPE_WEBP')) {
  define('IMAGETYPE_WEBP', 18);
}
 
 
function getDefaultImageSizes()
{
  $maxwidthsmall = 480;
  $maxheightsmall = 270; // Near 16/9eme
  $maxwidthmini = 128;
  $maxheightmini = 72; // 16/9eme
  $quality = 80;
 
  return array(
    'maxwidthsmall' => $maxwidthsmall,
    'maxheightsmall' => $maxheightsmall,
    'maxwidthmini' => $maxwidthmini,
    'maxheightmini' => $maxheightmini,
    'quality' => $quality
  );
}
 
function getListOfPossibleImageExt($acceptsvg = 0)
{
  $regeximgext = '\.gif|\.jpg|\.jpeg|\.png|\.bmp|\.webp|\.xpm|\.xbm'; // See also into product.class.php
  if ($acceptsvg || getDolGlobalString('MAIN_ALLOW_SVG_FILES_AS_IMAGES')) {
    $regeximgext .= '|\.svg'; // Not allowed by default. SVG can contains javascript
  }
 
  return $regeximgext;
}
 
function image_format_supported($file, $acceptsvg = 0)
{
  $regeximgext = getListOfPossibleImageExt();
 
  // Case filename is not a format image
  $reg = array();
  if (!preg_match('/('.$regeximgext.')$/i', $file, $reg)) {
    return -1;
  }
 
  // Case filename is a format image but not supported by this PHP
  $imgfonction = '';
  if (strtolower($reg[1]) == '.gif') {
    $imgfonction = 'imagecreatefromgif';
  }
  if (strtolower($reg[1]) == '.jpg') {
    $imgfonction = 'imagecreatefromjpeg';
  }
  if (strtolower($reg[1]) == '.jpeg') {
    $imgfonction = 'imagecreatefromjpeg';
  }
  if (strtolower($reg[1]) == '.png') {
    $imgfonction = 'imagecreatefrompng';
  }
  if (strtolower($reg[1]) == '.bmp') {
    $imgfonction = 'imagecreatefromwbmp';
  }
  if (strtolower($reg[1]) == '.webp') {
    $imgfonction = 'imagecreatefromwebp';
  }
  if (strtolower($reg[1]) == '.xpm') {
    $imgfonction = 'imagecreatefromxpm';
  }
  if (strtolower($reg[1]) == '.xbm') {
    $imgfonction = 'imagecreatefromxbm';
  }
  if (strtolower($reg[1]) == '.svg') {
    $imgfonction = 'imagecreatefromsvg'; // Never available
  }
  if ($imgfonction) {
    if (!function_exists($imgfonction)) {
      // Functions of conversion not available in this PHP
      return 0;
    }
 
    // Filename is a format image and supported for conversion by this PHP
    return 1;
  }
 
  return 0;
}
 
 
function dol_getImageSize($file, $url = false)
{
  $ret = array();
 
  if (image_format_supported($file) < 0) {
    return $ret;
  }
 
  $filetoread = $file;
  if (!$url) {
    $filetoread = realpath(dol_osencode($file)); // Chemin canonique absolu de l'image
  }
 
  if ($filetoread) {
    $infoImg = getimagesize($filetoread); // Recuperation des infos de l'image
    if ($infoImg) {
      $ret['width'] = $infoImg[0]; // Largeur de l'image
      $ret['height'] = $infoImg[1]; // Hauteur de l'image
    } else {
      $ret['width'] = $ret['height'] = '';
    }
  }
 
  return $ret;
}
 
 
function dol_imageResizeOrCrop($file, $mode, $newWidth, $newHeight, $src_x = 0, $src_y = 0, $filetowrite = '', $newquality = 0)
{
  require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 
  global $conf, $langs;
 
  dol_syslog("dol_imageResizeOrCrop file=".$file." mode=".$mode." newWidth=".$newWidth." newHeight=".$newHeight." src_x=".$src_x." src_y=".$src_y);
 
  // Clean parameters
  $file = trim($file);
 
  // Check parameters
  if (!$file) {
    // Si le fichier n'a pas ete indique
    return 'Bad parameter file';
  } elseif (!file_exists($file)) {
    // Si le fichier passe en parameter n'existe pas
    return $langs->trans("ErrorFileNotFound", $file);
  } elseif (image_format_supported($file) < 0) {
    return 'This filename '.$file.' does not seem to be an image filename.';
  } elseif (!is_numeric($newWidth) && !is_numeric($newHeight)) {
    return 'Wrong value for parameter newWidth or newHeight';
  } elseif ($mode == 0 && $newWidth <= 0 && $newHeight <= 0 && (empty($filetowrite) || $filetowrite == $file)) {
    return 'At least newHeight or newWidth must be defined for resizing, or a target filename must be set to convert';
  } elseif ($mode == 1 && ($newWidth <= 0 || $newHeight <= 0)) {
    return 'Both newHeight or newWidth must be defined for croping';
  }
 
  $filetoread = realpath(dol_osencode($file)); // Chemin canonique absolu de l'image
 
  $infoImg = getimagesize($filetoread);       // Get data about src image
  $imgWidth = $infoImg[0]; // Largeur de l'image
  $imgHeight = $infoImg[1]; // Hauteur de l'image
 
  $imgTargetName = ($filetowrite ? $filetowrite : $file);
  $newExt = strtolower(pathinfo($imgTargetName, PATHINFO_EXTENSION));
 
  if ($mode == 0) { // If resize, we check parameters
    if (!empty($filetowrite) && $filetowrite != $file && $newWidth <= 0 && $newHeight <= 0) {
      $newWidth = $imgWidth;
      $newHeight = $imgHeight;
    }
 
    if ($newWidth <= 0) {
      $newWidth = intval(($newHeight / $imgHeight) * $imgWidth); // Keep ratio
    }
    if ($newHeight <= 0) {
      $newHeight = intval(($newWidth / $imgWidth) * $imgHeight); // Keep ratio
    }
  }
 
  // Test function to read source image exists
  $imgfonction = '';
  switch ($infoImg[2]) {
    case 1: // IMG_GIF
      $imgfonction = 'imagecreatefromgif';
      break;
    case 2: // IMG_JPG
      $imgfonction = 'imagecreatefromjpeg';
      break;
    case 3: // IMG_PNG
      $imgfonction = 'imagecreatefrompng';
      break;
    case 4: // IMG_WBMP
      $imgfonction = 'imagecreatefromwbmp';
      break;
    case 18: // IMG_WEBP
      $imgfonction = 'imagecreatefromwebp';
      break;
  }
  if ($imgfonction) {
    if (!function_exists($imgfonction)) {
      // Functions de conversion non presente dans ce PHP
      return 'Read of image not possible. This PHP does not support GD functions '.$imgfonction;
    }
  }
 
  // Test function to write target image exists
  if ($filetowrite) {
    $imgfonction = '';
    switch ($newExt) {
      case 'gif':   // IMG_GIF
        $imgfonction = 'imagecreatefromgif';
        break;
      case 'jpg':   // IMG_JPG
      case 'jpeg':  // IMG_JPEG
        $imgfonction = 'imagecreatefromjpeg';
        break;
      case 'png':   // IMG_PNG
        $imgfonction = 'imagecreatefrompng';
        break;
      case 'bmp':   // IMG_WBMP
        $imgfonction = 'imagecreatefromwbmp';
        break;
      case 'webp':  // IMG_WEBP
        $imgfonction = 'imagecreatefromwebp';
        break;
    }
    if ($imgfonction) {
      if (!function_exists($imgfonction)) {
        // Functions de conversion non presente dans ce PHP
        return 'Write of image not possible. This PHP does not support GD functions '.$imgfonction;
      }
    }
  }
 
  // Read source image file
  switch ($infoImg[2]) {
    case 1: // Gif
      $img = imagecreatefromgif($filetoread);
      $extImg = '.gif'; // File name extension of image
      break;
    case 2: // Jpg
      $img = imagecreatefromjpeg($filetoread);
      $extImg = '.jpg';
      break;
    case 3: // Png
      $img = imagecreatefrompng($filetoread);
      $extImg = '.png';
      break;
    case 4: // Bmp
      $img = imagecreatefromwbmp($filetoread);
      $extImg = '.bmp';
      break;
    case 18: // Webp
      $img = imagecreatefromwebp($filetoread);
      $extImg = '.webp';
      break;
  }
 
  // Create empty image for target
  if ($newExt == 'gif') {
    // Compatibility image GIF
    $imgTarget = imagecreate($newWidth, $newHeight);
  } else {
    $imgTarget = imagecreatetruecolor($newWidth, $newHeight);
  }
 
  // Activate antialiasing for better quality
  if (function_exists('imageantialias')) {
    imageantialias($imgTarget, true);
  }
 
  // This is to keep transparent alpha channel if exists (PHP >= 4.2)
  if (function_exists('imagesavealpha')) {
    imagesavealpha($imgTarget, true);
  }
 
  // Set transparent color according to image extension
  $trans_colour = -1; // By default, undefined
  switch ($newExt) {
    case 'gif': // Gif
      $trans_colour = imagecolorallocate($imgTarget, 255, 255, 255); // The method is different for the GIF format
      imagecolortransparent($imgTarget, $trans_colour);
      break;
    case 'jpg': // Jpg
    case 'jpeg':  // Jpeg
      $trans_colour = imagecolorallocatealpha($imgTarget, 255, 255, 255, 0);
      break;
    case 'png': // Png
      imagealphablending($imgTarget, false); // For compatibility with certain systems
      $trans_colour = imagecolorallocatealpha($imgTarget, 255, 255, 255, 127); // Keep transparent channel
      break;
    case 'bmp': // Bmp
      $trans_colour = imagecolorallocatealpha($imgTarget, 255, 255, 255, 0);
      break;
    case 'webp': // Webp
      $trans_colour = imagecolorallocatealpha($imgTarget, 255, 255, 255, 127);
      break;
  }
  if (function_exists("imagefill") && $trans_colour > 0) {
    imagefill($imgTarget, 0, 0, $trans_colour);
  }
 
  dol_syslog("dol_imageResizeOrCrop: convert image from ($imgWidth x $imgHeight) at position ($src_x x $src_y) to ($newWidth x $newHeight) as a $extImg");
  //imagecopyresized($imgTarget, $img, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $imgWidth, $imgHeight); // Insere l'image de base redimensionnee
  imagecopyresampled($imgTarget, $img, 0, 0, $src_x, $src_y, $newWidth, $newHeight, ($mode == 0 ? $imgWidth : $newWidth), ($mode == 0 ? $imgHeight : $newHeight)); // Insere l'image de base redimensionnee
 
  // Check if permission are ok
  //$fp = fopen($imgTargetName, "w");
  //fclose($fp);
 
  // Create image on disk (overwrite file if exists)
  switch ($newExt) {
    case 'gif': // Gif
      $newquality = 'NU'; // Quality is not used for this format
      imagegif($imgTarget, $imgTargetName);
      break;
    case 'jpg': // Jpg
    case 'jpeg':  // Jpeg
      $newquality = ($newquality ? $newquality : '100'); // % quality maximum
      imagejpeg($imgTarget, $imgTargetName, $newquality);
      break;
    case 'png': // Png
      $newquality = 0; // No compression (0-9)
      imagepng($imgTarget, $imgTargetName, $newquality);
      break;
    case 'bmp': // Bmp
      $newquality = 'NU'; // Quality is not used for this format
      imagewbmp($imgTarget, $imgTargetName);
      break;
    case 'webp': // Webp
      $newquality = ($newquality ? $newquality : '100'); // % quality maximum
      imagewebp($imgTarget, $imgTargetName, $newquality);
      break;
    default:
      dol_syslog("images.lib.php::imageResizeOrCrop() Format ".$newExt." is not supported", LOG_WARNING);
  }
 
  // Set permissions on file
  dolChmod($imgTargetName);
 
  // Free memory. This does not delete image.
  imagedestroy($img);
  imagedestroy($imgTarget);
 
  clearstatcache(); // File was replaced by a modified one, so we clear file caches.
 
  return $imgTargetName;
}
 
 
function dolRotateImage($file_path)
{
  return correctExifImageOrientation($file_path, $file_path);
}
 
 
function correctExifImageOrientation($fileSource, $fileDest, $quality = 95)
{
  if (function_exists('exif_read_data')) {
    $exif = @exif_read_data($fileSource);
    if ($exif && isset($exif['Orientation'])) {
      $infoImg = getimagesize($fileSource); // Get image infos
 
      $orientation = $exif['Orientation'];
      if ($orientation != 1) {
        $img = imagecreatefromjpeg($fileSource);
        $deg = 0;
        switch ($orientation) {
          case 3:
            $deg = 180;
            break;
          case 6:
            $deg = 270;
            break;
          case 8:
            $deg = 90;
            break;
        }
        if ($deg) {
          if ($infoImg[2] === IMAGETYPE_PNG) { // In fact there is no exif on PNG but just in case
            imagealphablending($img, false);
            imagesavealpha($img, true);
            $img = imagerotate($img, $deg, imagecolorallocatealpha($img, 0, 0, 0, 127));
            imagealphablending($img, false);
            imagesavealpha($img, true);
          } else {
            $img = imagerotate($img, $deg, 0);
          }
        }
        // then rewrite the rotated image back to the disk as $fileDest
        if ($fileDest === false) {
          return $img;
        } else {
          // In fact there exif is only for JPG but just in case
          // Create image on disk
          $image = false;
 
          switch ($infoImg[2]) {
            case IMAGETYPE_GIF:     // 1
              $image = imagegif($img, $fileDest);
              break;
            case IMAGETYPE_JPEG:    // 2
              $image = imagejpeg($img, $fileDest, $quality);
              break;
            case IMAGETYPE_PNG:     // 3
              $image = imagepng($img, $fileDest, $quality);
              break;
            case IMAGETYPE_BMP:     // 6
              // Not supported by PHP GD
              break;
            case IMAGETYPE_WBMP:    // 15
              $image = imagewbmp($img, $fileDest);
              break;
          }
 
          // Free up memory (imagedestroy does not delete files):
          @imagedestroy($img);
 
          return $image;
        }
      } // if there is some rotation necessary
    } // if have the exif orientation info
  } // if function exists
 
  return false;
}
 
function vignette($file, $maxWidth = 160, $maxHeight = 120, $extName = '_small', $quality = 50, $outdir = 'thumbs', $targetformat = 0)
{
  require_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
 
  global $conf, $langs;
 
  dol_syslog("vignette file=".$file." extName=".$extName." maxWidth=".$maxWidth." maxHeight=".$maxHeight." quality=".$quality." outdir=".$outdir." targetformat=".$targetformat);
 
  // Clean parameters
  $file = trim($file);
 
  // Check parameters
  if (!$file) {
    // If the file has not been indicated
    return 'ErrorBadParameters';
  } elseif (!file_exists($file)) {
    // If the file passed in parameter does not exist
    dol_syslog($langs->trans("ErrorFileNotFound", $file), LOG_ERR);
    return $langs->trans("ErrorFileNotFound", $file);
  } elseif (image_format_supported($file) < 0) {
    dol_syslog('This file '.$file.' does not seem to be an image format file name.', LOG_WARNING);
    return 'ErrorBadImageFormat';
  } elseif (!is_numeric($maxWidth) || empty($maxWidth) || $maxWidth < -1) {
    // If max width is incorrect (not numeric, empty, or less than 0)
    dol_syslog('Wrong value for parameter maxWidth', LOG_ERR);
    return 'Error: Wrong value for parameter maxWidth';
  } elseif (!is_numeric($maxHeight) || empty($maxHeight) || $maxHeight < -1) {
    // If max height is incorrect (not numeric, empty, or less than 0)
    dol_syslog('Wrong value for parameter maxHeight', LOG_ERR);
    return 'Error: Wrong value for parameter maxHeight';
  }
 
  $filetoread = realpath(dol_osencode($file)); // Chemin canonique absolu de l'image
 
  $infoImg = getimagesize($filetoread); // Recuperation des infos de l'image
  $imgWidth = $infoImg[0]; // Largeur de l'image
  $imgHeight = $infoImg[1]; // Hauteur de l'image
 
  $ort = false;
  if (function_exists('exif_read_data')) {
    $exif = @exif_read_data($filetoread);
    if ($exif && !empty($exif['Orientation'])) {
      $ort = $exif['Orientation'];
    }
  }
 
  if ($maxWidth == -1) {
    $maxWidth = $infoImg[0]; // If size is -1, we keep unchanged
  }
  if ($maxHeight == -1) {
    $maxHeight = $infoImg[1]; // If size is -1, we keep unchanged
  }
 
  // If the image is smaller than the maximum width and height, no thumbnail is created.
  if ($infoImg[0] < $maxWidth && $infoImg[1] < $maxHeight) {
    // On cree toujours les vignettes
    dol_syslog("File size is smaller than thumb size", LOG_DEBUG);
    //return 'Le fichier '.$file.' ne necessite pas de creation de vignette';
  }
 
  $imgfonction = '';
  switch ($infoImg[2]) {
    case IMAGETYPE_GIF:     // 1
      $imgfonction = 'imagecreatefromgif';
      break;
    case IMAGETYPE_JPEG:    // 2
      $imgfonction = 'imagecreatefromjpeg';
      break;
    case IMAGETYPE_PNG:     // 3
      $imgfonction = 'imagecreatefrompng';
      break;
    case IMAGETYPE_BMP:     // 6
      // Not supported by PHP GD
      break;
    case IMAGETYPE_WBMP:  // 15
      $imgfonction = 'imagecreatefromwbmp';
      break;
    case IMAGETYPE_WEBP:  // 18
      $imgfonction = 'imagecreatefromwebp';
      break;
  }
  if ($imgfonction) {
    if (!function_exists($imgfonction)) {
      // Conversion functions not present in this PHP
      return 'Error: Creation of thumbs not possible. This PHP does not support GD function '.$imgfonction;
    }
  }
 
  // We create the directory containing the thumbnails
  $dirthumb = dirname($file).($outdir ? '/'.$outdir : ''); // Path to thumbnail folder
  dol_mkdir($dirthumb);
 
  // Variable initialization according to image extension
  $img = null;
  switch ($infoImg[2]) {
    case IMAGETYPE_GIF:     // 1
      $img = imagecreatefromgif($filetoread);
      $extImg = '.gif';
      break;
    case IMAGETYPE_JPEG:    // 2
      $img = imagecreatefromjpeg($filetoread);
      $extImg = (preg_match('/\.jpeg$/', $file) ? '.jpeg' : '.jpg');
      break;
    case IMAGETYPE_PNG:     // 3
      $img = imagecreatefrompng($filetoread);
      $extImg = '.png';
      break;
    case IMAGETYPE_BMP:     // 6
      // Not supported by PHP GD
      $extImg = '.bmp';
      break;
    case IMAGETYPE_WBMP:  // 15
      $img = imagecreatefromwbmp($filetoread);
      $extImg = '.bmp';
      break;
    case IMAGETYPE_WEBP:  // 18
      $img = imagecreatefromwebp($filetoread);
      $extImg = '.webp';
      break;
  }
 
  // Before PHP8, img was a resource, With PHP8, it is a GdImage
  if (!is_resource($img) && class_exists('GdImage') && !($img instanceof GdImage)) {
    dol_syslog('Failed to detect type of image. We found infoImg[2]='.$infoImg[2], LOG_WARNING);
    return 0;
  }
 
  $exifAngle = false;
  if ($ort && getDolGlobalString('MAIN_USE_EXIF_ROTATION')) {
    switch ($ort) {
      case 3: // 180 rotate left
        $exifAngle = 180;
        break;
      case 6: // 90 rotate right
        $exifAngle = -90;
        // changing sizes
        $trueImgWidth = $infoImg[1];
        $trueImgHeight = $infoImg[0];
        break;
      case 8:    // 90 rotate left
        $exifAngle = 90;
        // changing sizes
        $trueImgWidth = $infoImg[1]; // Largeur de l'image
        $trueImgHeight = $infoImg[0]; // Hauteur de l'image
        break;
    }
  }
 
  if ($exifAngle) {
    $rotated = false;
 
    if ($infoImg[2] === IMAGETYPE_PNG) { // In fact there is no exif on PNG but just in case
      imagealphablending($img, false);
      imagesavealpha($img, true);
      $rotated = imagerotate($img, $exifAngle, imagecolorallocatealpha($img, 0, 0, 0, 127));
      imagealphablending($rotated, false);
      imagesavealpha($rotated, true);
    } else {
      $rotated = imagerotate($img, $exifAngle, 0);
    }
 
    // replace image with good orientation
    if (!empty($rotated) && isset($trueImgWidth) && isset($trueImgHeight)) {
      $img = $rotated;
      $imgWidth = $trueImgWidth;
      $imgHeight = $trueImgHeight;
    }
  }
 
  // Initialize thumbnail dimensions if larger than original
  if ($maxWidth > $imgWidth) {
    $maxWidth = $imgWidth;
  }
  if ($maxHeight > $imgHeight) {
    $maxHeight = $imgHeight;
  }
 
  $whFact = $maxWidth / $maxHeight; // Width/height factor for maximum label dimensions
  $imgWhFact = $imgWidth / $imgHeight; // Original width/height factor
 
  // Set label dimensions
  if ($whFact < $imgWhFact) {
    // If determining width
    $thumbWidth  = $maxWidth;
    $thumbHeight = $thumbWidth / $imgWhFact;
  } else {
    // If determining height
    $thumbHeight = $maxHeight;
    $thumbWidth  = $thumbHeight * $imgWhFact;
  }
  $thumbHeight = (int) round($thumbHeight);
  $thumbWidth = (int) round($thumbWidth);
 
  // Define target format
  if (empty($targetformat)) {
    $targetformat = $infoImg[2];
  }
 
  // Create empty image
  if ($targetformat == IMAGETYPE_GIF) {
    // Compatibilite image GIF
    $imgThumb = imagecreate($thumbWidth, $thumbHeight);
  } else {
    $imgThumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
  }
 
  // Activate antialiasing for better quality
  if (function_exists('imageantialias')) {
    imageantialias($imgThumb, true);
  }
 
  // This is to keep transparent alpha channel if exists (PHP >= 4.2)
  if (function_exists('imagesavealpha')) {
    imagesavealpha($imgThumb, true);
  }
 
  // Variable initialization according to image extension
  // $targetformat is 0 by default, in such case, we keep original extension
  switch ($targetformat) {
    case IMAGETYPE_GIF:     // 1
      $trans_colour = imagecolorallocate($imgThumb, 255, 255, 255); // The GIF format works differently
      imagecolortransparent($imgThumb, $trans_colour);
      $extImgTarget = '.gif';
      $newquality = 'NU';
      break;
    case IMAGETYPE_JPEG:    // 2
      $trans_colour = imagecolorallocatealpha($imgThumb, 255, 255, 255, 0);
      $extImgTarget = (preg_match('/\.jpeg$/i', $file) ? '.jpeg' : '.jpg');
      $newquality = $quality;
      break;
    case IMAGETYPE_PNG:     // 3
      imagealphablending($imgThumb, false); // For compatibility on certain systems
      $trans_colour = imagecolorallocatealpha($imgThumb, 255, 255, 255, 127); // Keep transparent channel
      $extImgTarget = '.png';
      $newquality = $quality - 100;
      $newquality = round(abs($quality - 100) * 9 / 100);
      break;
    case IMAGETYPE_BMP:     // 6
      // Not supported by PHP GD
      $extImgTarget = '.bmp';
      $newquality = 'NU';
      break;
    case IMAGETYPE_WBMP:  // 15
      $trans_colour = imagecolorallocatealpha($imgThumb, 255, 255, 255, 0);
      $extImgTarget = '.bmp';
      $newquality = 'NU';
      break;
    case IMAGETYPE_WEBP:  // 18
      $trans_colour = imagecolorallocatealpha($imgThumb, 255, 255, 255, 0);
      $extImgTarget = '.webp';
      $newquality = $quality;
      break;
  }
  if (function_exists("imagefill")) {
    imagefill($imgThumb, 0, 0, $trans_colour);
  }
 
  dol_syslog("vignette: convert image from ($imgWidth x $imgHeight) to ($thumbWidth x $thumbHeight) as $extImg, newquality=$newquality");
  //imagecopyresized($imgThumb, $img, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $imgWidth, $imgHeight); // Insert resized base image
  imagecopyresampled($imgThumb, $img, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $imgWidth, $imgHeight); // Insert resized base image
 
  $fileName = preg_replace('/(\.gif|\.jpeg|\.jpg|\.png|\.bmp)$/i', '', $file); // We remove any extension box
  $fileName = basename($fileName);
  //$imgThumbName = $dirthumb.'/'.getImageFileNameForSize(basename($file), $extName, $extImgTarget);   // Full path of thumb file
  $imgThumbName = getImageFileNameForSize($file, $extName, $extImgTarget); // Full path of thumb file
 
 
  // Check if permission are ok
  //$fp = fopen($imgThumbName, "w");
  //fclose($fp);
 
  // Create image on disk
  switch ($targetformat) {
    case IMAGETYPE_GIF:     // 1
      imagegif($imgThumb, $imgThumbName);
      break;
    case IMAGETYPE_JPEG:    // 2
      imagejpeg($imgThumb, $imgThumbName, $newquality);
      break;
    case IMAGETYPE_PNG:     // 3
      imagepng($imgThumb, $imgThumbName, $newquality);
      break;
    case IMAGETYPE_BMP:     // 6
      // Not supported by PHP GD
      break;
    case IMAGETYPE_WBMP:    // 15
      imagewbmp($imgThumb, $imgThumbName);
      break;
    case IMAGETYPE_WEBP:    // 18
      imagewebp($imgThumb, $imgThumbName, $newquality);
      break;
  }
 
  // Set permissions on file
  dolChmod($imgThumbName);
 
  // Free memory. This does not delete image.
  imagedestroy($img);
  imagedestroy($imgThumb);
 
  return $imgThumbName;
}