function process_form()
 {
     $button = required_param('button', PARAM_TEXT);
     switch ($button) {
         case $this->buttonresize:
             $size = required_param('size', PARAM_INT);
             list($width, $height) = explode('x', $this->resizeoptions[$size]);
             break;
         case $this->buttonscale:
             $scale = required_param('scale', PARAM_INT);
             $imagesize = getimagesize($this->imagepath);
             $width = $imagesize[0] * ($scale / 100);
             $height = $imagesize[1] * ($scale / 100);
             break;
     }
     $info = lightboxgallery_image_info($this->imagepath);
     if ($im = lightboxgallery_imagecreatefromtype($info->imagesize[2], $this->imagepath)) {
         $resized = lightboxgallery_resize_image($im, $info, $width, $height);
         $this->save_image_resource($resized, $info->imagesize[2]);
     }
 }
function lightboxgallery_image_thumbnail($courseid, $gallery, $file, $offsetx = 0, $offsety = 0)
{
    global $CFG;
    // If anything fails when retrieving the thumbnail, we'll fallback to just printing a label
    $fallback = '[' . $file . ']';
    $oldpath = $CFG->dataroot . '/' . $courseid . '/' . $gallery->folder . '/' . $file;
    $newpath = $courseid . '/' . $gallery->folder . '/_thumb/' . $file . '.jpg';
    if (empty($CFG->gdversion)) {
        return $fallback;
    }
    umask(00);
    if (file_exists($CFG->dataroot . '/' . $newpath)) {
        return lightboxgallery_make_img(lightboxgallery_get_image_url($gallery->id, $file, true));
    } else {
        $thumbdir = $CFG->dataroot . '/' . dirname($newpath);
        if (!file_exists($thumbdir) && !mkdir($thumbdir, $CFG->directorypermissions)) {
            return $fallback;
        }
    }
    $info = lightboxgallery_image_info($oldpath);
    if (!($im = lightboxgallery_imagecreatefromtype($info->imagesize[2], $oldpath))) {
        return $fallback;
    }
    $thumb = lightboxgallery_resize_image($im, $info, THUMB_WIDTH, THUMB_HEIGHT, $offsetx, $offsety);
    if (function_exists('ImageJpeg')) {
        @touch($CFG->dataroot . '/' . $newpath);
        if (ImageJpeg($thumb, $CFG->dataroot . '/' . $newpath, 90)) {
            @chmod($CFG->dataroot . '/' . $newpath, 0666);
            return lightboxgallery_make_img(lightboxgallery_get_image_url($gallery->id, $file, true));
        }
    } else {
        return $fallback;
    }
}
 }
 $resizeoption = 0;
 if (in_array($gallery->autoresize, array(AUTO_RESIZE_UPLOAD, AUTO_RESIZE_BOTH))) {
     $resizeoption = $gallery->resize;
 } else {
     if (isset($formdata->resize)) {
         $resizeoption = $formdata->resize;
     }
 }
 if ($resizeoption > 0) {
     $resizeoptions = lightboxgallery_resize_options();
     $fullpath = $CFG->dataroot . '/' . $uploaddir . '/' . $filename;
     $info = lightboxgallery_image_info($fullpath);
     if ($im = lightboxgallery_imagecreatefromtype($info->imagesize[2], $fullpath)) {
         list($width, $height) = explode('x', $resizeoptions[$resizeoption]);
         if ($resized = lightboxgallery_resize_image($im, $info, $width, $height)) {
             switch ($info->imagesize[2]) {
                 case 1:
                     $function = 'ImageGIF';
                     break;
                 case 2:
                     $function = 'ImageJPEG';
                     break;
                 case 3:
                     $function = 'ImagePNG';
                     break;
             }
             if (function_exists($function)) {
                 $function($resized, $fullpath, $info->imagesize[2] == 3 ? 9 : 100);
             }
         }