$send_function_name = wpws_ImageUtils::get_send_function_name($file);
if (wpws_cacheIsFunctional()) {
// Use the cache
$mtime = filemtime($file);
if (wpws_ImageUtils::cached_file_is_needed($src, $width, $height, $quality, $mtime)) {
// Cache image
wpws_ImageUtils::remove_cached_file($src, $width, $height, $quality);
$resized_image = wpws_ImageUtils::generate_resized_image($file, $width, $height);
$cache_filename = wpws_ImageUtils::generate_timestamped_cache_filename($src, $width, $height, $quality, $mtime);
$send_function_name($resized_image, WPWS_CACHE_DIR . "/" . $cache_filename, $quality);
}
$cached_file = wpws_ImageUtils::get_cached_file($src, $width, $height, $quality);
header("Content-Type: " . wpws_ImageUtils::get_mime_type($file));
header("Content-Length: " . filesize($cached_file));
readfile($cached_file);
} else {
// Do not use the cache
$resized_image = wpws_ImageUtils::generate_resized_image($file, $width, $height);
ob_start();
$send_function_name($resized_image, "", $quality);
header("Content-Type: " . get_mime_type($file));
header("Content-Length: " . ob_get_length());
ob_end_flush();
}
// Delete temporary resources
if ($resized_image) {
imagedestroy($resized_image);
}
exit;
?>
/**
* Determines whether the cache entry needs to be updated
* for a specified file.
* @param string file (path)
* @param int width to resize to
* @param int height to resize to
* @param int value between 0 and 100 for jpeg; null for any other format
* @param int last modified timestamp of the file in question
* @param boolean true if cache needs to be created / updated
*/
function cached_file_is_needed($src, $width, $height, $quality, $timestamp)
{
$cached_file = wpws_ImageUtils::get_cached_file($src, $width, $height, $quality);
if (!$cached_file) {
return true;
}
$cached_file_timestamp = wpws_ImageUtils::get_mtime_from_cached_file($cached_file);
if ($cached_file_timestamp != $timestamp) {
return true;
}
return false;
}