Add Bratonien watermark engine switch foundation

include/watermark_engine.inc.php

@@ -0,0 +1,61 @@
+<?php
+if (!defined('PHPWG_ROOT_PATH'))
+{
+  die('Hacking attempt!');
+}
+
+function bratonien_tools_watermark_engine_enabled()
+{
+  $config = bratonien_tools_get_watermark_engine_config();
+  return !empty($config['enabled']);
+}
+
+function bratonien_tools_get_watermark_engine_config()
+{
+  $default = array(
+    'enabled' => false,
+    'restore_piwigo' => true,
+  );
+
+  if (!function_exists('conf_get_param'))
+  {
+    return $default;
+  }
+
+  $stored = conf_get_param('bratonien_watermark_engine', null);
+  if (empty($stored))
+  {
+    return $default;
+  }
+
+  $decoded = json_decode($stored, true);
+  return is_array($decoded) ? array_merge($default, $decoded) : $default;
+}
+
+function bratonien_tools_set_watermark_engine($enabled)
+{
+  if (!function_exists('conf_update_param'))
+  {
+    throw new RuntimeException('Piwigo-Konfiguration ist nicht verfuegbar.');
+  }
+
+  $config = bratonien_tools_get_watermark_engine_config();
+  $config['enabled'] = (bool) $enabled;
+
+  conf_update_param('bratonien_watermark_engine', json_encode($config));
+}
+
+function bratonien_tools_disable_piwigo_watermarks()
+{
+  if (!class_exists('ImageStdParams'))
+  {
+    require_once(PHPWG_ROOT_PATH . 'include/derivative_std_params.inc.php');
+  }
+
+  foreach (ImageStdParams::get_defined_type_map() as $params)
+  {
+    $params->use_watermark = false;
+  }
+
+  ImageStdParams::save();
+}