/**
* Record where reduced images are being used so that we can delete them later if they are no longer referenced
* ... no guarantee the reduced image won't be copy & pasted into other pages.. page copies would need to track the data as well
*
*/
static function ResizedImageUse($list_before, $list_after)
{
global $dataDir;
//subtract uses no longer
$subtract_use = $list_before;
foreach ($list_before as $index => $sizes) {
if (isset($list_after[$index])) {
$subtract_use[$index] = array_diff($list_before[$index], $list_after[$index]);
}
}
//add uses
$add_use = $list_after;
foreach ($add_use as $index => $sizes) {
if (isset($list_before[$index])) {
$add_use[$index] = array_diff($list_after[$index], $list_before[$index]);
}
}
//save info for each image
$all_imgs = array_keys($subtract_use + $add_use);
foreach ($all_imgs as $index) {
$edited = false;
$usage = gp_resized::GetUsage($index);
//add uses
if (isset($add_use[$index]) && count($add_use[$index])) {
$edited = true;
foreach ($add_use[$index] as $size) {
if (isset($usage[$size])) {
$usage[$size]['uses']++;
} else {
$usage[$size]['uses'] = 1;
$usage[$size]['created'] = time();
}
$usage[$size]['touched'] = time();
}
}
//remove uses
$set_to_zero = array();
if (isset($subtract_use[$index]) && is_array($subtract_use[$index])) {
$edited = true;
foreach ($subtract_use[$index] as $size) {
if (isset($usage[$size])) {
$usage[$size]['uses']--;
} else {
$usage[$size]['uses'] = 0;
$usage[$size]['created'] = time();
//shouldn't happen
}
$usage[$size]['uses'] = max($usage[$size]['uses'], 0);
if ($usage[$size]['uses'] == 0) {
$set_to_zero[] = $size;
}
$usage[$size]['touched'] = time();
}
}
//if uses < 1, delete the file, but not the record
foreach ($set_to_zero as $size) {
list($width, $height) = explode('x', $size);
//make sure the image still exists
if (!isset(gp_resized::$index[$index])) {
continue;
}
$img = gp_resized::$index[$index];
$info = gp_resized::ImageInfo($img, $width, $height);
if (!$info) {
continue;
}
$full_path = $dataDir . '/data/_resized/' . $index . '/' . $info['name'];
if (file_exists($full_path)) {
@unlink($full_path);
}
}
//order usage by sizes: small to large
uksort($usage, array('gp_edit', 'SizeCompare'));
if ($edited) {
gp_resized::SaveUsage($index, $usage);
}
}
}
/**
* Delete unused images
* if uses < 1, delete the file, but not the record
*
*/
private static function DeleteUnused($index, $size)
{
global $dataDir;
list($width, $height) = explode('x', $size);
//make sure the image still exists
if (!isset(\gp_resized::$index[$index])) {
continue;
}
$img = \gp_resized::$index[$index];
$info = \gp_resized::ImageInfo($img, $width, $height);
if (!$info) {
continue;
}
$full_path = $dataDir . '/data/_resized/' . $index . '/' . $info['name'];
if (file_exists($full_path)) {
@unlink($full_path);
}
}