public function generate_image($type, $filter_chain)
{
try {
$original = new midcom_db_attachment($this->attachment);
} catch (midcom_error $e) {
$e->log();
return false;
}
$found_derived = false;
try {
$derived = new midcom_db_attachment($this->{$type});
$found_derived = true;
} catch (midcom_error $e) {
$derived = new midcom_db_attachment();
$derived->parentguid = $original->parentguid;
$derived->title = $original->title;
$derived->mimetype = $original->mimetype;
$derived->name = $type . '_' . $original->name;
}
$imagefilter = new midcom_helper_imagefilter($original);
if (!$imagefilter->process_chain($filter_chain)) {
throw new midcom_error('Image processing failed');
}
if (!$found_derived) {
if (!$derived->create()) {
throw new midcom_error('Failed to create derived image: ' . midcom_connection::get_error_string());
}
$this->{$type} = $derived->id;
$this->update();
}
return $imagefilter->write($derived);
}
/**
* Overwrites image content from file, recalculates size etc
*
* @param string $identifier image identifier to update
* @param string $file file to use
* @return boolean indicating success/failure
*/
function update_image_from_file($identifier, $file)
{
if (!$this->_filter->write($this->attachments[$identifier])) {
return false;
}
// Failing these is bad, but it's too late now that we already have overwritten the actual image data...
$this->_set_attachment_info_additional($identifier, $file);
$this->_update_attachment_info($identifier);
return true;
}
