// thumbnail
if ($width || $height) {
$thumb_path = DIR_WS_IMAGES . intval($width) . 'x' . intval($height) . '/';
$thumb_src = $thumb_path . basename($src);
// use thumbnail if available
if (file_exists($thumb_src)) {
$src = $thumb_src;
}
// create thumbnail with GD
else if (function_exists('imagecreatetruecolor')) {
$src = img_thumb_create($src, $thumb_src, $width, $height);
}
// use css to avoid stretching (this works because width:auto overwrites width="...")
if (strpos($parameters, 'style=') === false) {
$parameters .= ' style="';
if ($width) {
$parameters .= 'width:auto;max-width:' . intval($width) . 'px;';
}
if ($height) {
$parameters .= 'height:auto;max-height:' . intval($height) . 'px;';
}
$parameters .= '"';
}
// use original image size to avoid stretching
else if (CONFIG_CALCULATE_IMAGE_SIZE) {
$image_size = @getimagesize($src);
list($width, $height) = img_ratio_size($image_size[0], $image_size[1], $width, $height);
}
}
And these functions are added, too:
function img_resize_gd($src, $mime, $width, $height, $dst, $new_width, $new_height) {
$imagecreatefunc = 'imagecreatefrom' . $mime;
$img = $imagecreatefunc($src);
$new_img = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($new_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagedestroy($img);
switch ($mime) {
case 'gif':
imagegif($new_img, $dst);
break;
case 'jpeg':
imagejpeg($new_img, $dst, 90);
break;
case 'png':
imagepng($new_img, $dst, 9);
break;
}
imagedestroy($new_img);
return file_exists($dst);
}
function img_ratio_size($width, $height, $max_width, $max_height) {
$ratio = min(($max_width ? $max_width / $width : 1) , ($max_height ? $max_height / $height : 1));
return array(intval($width * $ratio), intval($height * $ratio));
}
function img_thumb_create($src, $dst, $thumb_width, $thumb_height) {
$size = @getimagesize($src);
// check if all needed image data is available
if (!$size || !$size[0] || !$size[1] || !$size['mime']) {
return $src;
}
// we resize only specific image types
if (!preg_match('/^image\/(gif|jpg|jpeg|png)$/i', $size['mime'], $mime)) {
return $src;
}
$width = $size[0];
$height = $size[1];
if ($mime[1] == 'jpg') {
$mime[1] = 'jpeg';
}
// get thumbnail size
list($new_width, $new_height) = img_ratio_size($width, $height, $thumb_width, $thumb_height);
// no resizing needed
if ($width <= $new_width && $height <= $new_height) {
return $src;
}
// reset thumbnail cache
//array_map('unlink', glob(dirname($dst) . "/*.*"));
// create thumbnail dir if necessary
if (!file_exists(dirname($dst))) {
if (!mkdir(dirname($dst), 0755, true)) {
return $src;
}
}
// set memory limit on the fly
$bits = isset($size['bits']) ? $size['bits'] : 32;
$channels = isset($size['channels']) ? $size['channels'] : 8;
$K64 = pow(2,16); // number of bytes in 64K
$factor = 1.7;
$memory_needed = ($width * $height * $bits * $channels / 8 + $K64) * $factor;
$memory_limit = intval(ini_get('memory_limit')) * pow(1024, 2); // if --disable-memorylimit is set this is 0
$memory_usage = function_exists('memory_get_usage') ? memory_get_usage() : 0;
$memory_new_limit = min(134217728, $memory_needed + $memory_usage);// do not set more than 128 MB
if ($memory_limit && $memory_new_limit > $memory_limit) {
// try to set the new limit
if (!ini_set('memory_limit', ceil($memory_new_limit / pow(1024, 2)) . 'M')) {
return false;
}
}
// create thumbnail
if (img_resize_gd($src, $mime[1], $width, $height, $dst, $new_width, $new_height)) {
return $dst;
}
return $src;
}
Features:
1.) Creates thumbnails on-the-fly in DIR_WS_IMAGES subfolders like "130x130/"
2.) No stretching
3.) Faster loading time because of smaller images
4.) Adds the option to resize any image by passing width or height value like tep_image($image_filename, '', 120) or tep_image($image_filename, '', '', 120)
5.) Does not throw any error if GD is not enabled
6.) Sets a higher memory_limit on the fly (if supported)
7.) No settings needed
8.) No database changes
What is missing:
A "Clear thumbnail cache" option in the admin panel. But as there was no "Clear working cache" option, too, I did not realize it.
A security check could be added to the admin panel to notify the user if no GD is available.
I like to see this extension as part of the osC core: https://apps.oscommerce.com/Apps&7CTmT&on-the-fly-thumbnail-creator
No database changes or settings are needed. I used the osC coding style and original osC variables. The code changes as follows:
After this:
this is added:
And these functions are added, too:
Features: 1.) Creates thumbnails on-the-fly in DIR_WS_IMAGES subfolders like "130x130/" 2.) No stretching 3.) Faster loading time because of smaller images 4.) Adds the option to resize any image by passing width or height value like
tep_image($image_filename, '', 120)ortep_image($image_filename, '', '', 120)5.) Does not throw any error if GD is not enabled 6.) Sets a higher memory_limit on the fly (if supported) 7.) No settings needed 8.) No database changesWhat is missing: