From 47afbc7f4335e9f0b76d3361e8afa3d6dd5063f6 Mon Sep 17 00:00:00 2001
From: Terranom674 <thomas_dannenberg@web.de>
Date: Wed, 19 Aug 2026 22:38:54 +0200
Subject: [PATCH] Fix watermark context for album overview covers

---
 include/watermark_runtime.inc.php | 68 ++++++++++++++++++++++++++++++-
 1 file changed, 67 insertions(+), 1 deletion(-)

diff --git a/include/watermark_runtime.inc.php b/include/watermark_runtime.inc.php
index 97adee4..4e78c07 100644
--- a/include/watermark_runtime.inc.php
+++ b/include/watermark_runtime.inc.php
@@ -27,6 +27,72 @@ function bratonien_tools_runtime_category_id()
   return 0;
 }
 
+function bratonien_tools_watermark_album_cover_category($src_image, $category_id=null)
+{
+  static $map = null;
+
+  if ($map === null)
+  {
+    $map = new SplObjectStorage();
+  }
+
+  if (!is_object($src_image))
+  {
+    return 0;
+  }
+
+  if ($category_id !== null)
+  {
+    $category_id = (int)$category_id;
+    if ($category_id > 0)
+    {
+      $map[$src_image] = $category_id;
+    }
+    return $category_id;
+  }
+
+  return $map->contains($src_image) ? (int)$map[$src_image] : 0;
+}
+
+function bratonien_tools_watermark_prepare_album_overview($thumbnails)
+{
+  if (!is_array($thumbnails))
+  {
+    return $thumbnails;
+  }
+
+  foreach ($thumbnails as &$thumbnail)
+  {
+    $category_id = (int)($thumbnail['id'] ?? $thumbnail['ID'] ?? 0);
+    if ($category_id < 1 || empty($thumbnail['representative']['src_image']) || !is_object($thumbnail['representative']['src_image']))
+    {
+      continue;
+    }
+
+    // Ein Repraesentantenbild kann fuer mehrere Alben verwendet werden. Piwigo
+    // reicht in der Albumuebersicht aber nur das SrcImage an get_derivative_url
+    // weiter. Deshalb bekommt jedes Album-Cover eine eigene SrcImage-Instanz,
+    // damit seine konkrete Albumregel erhalten bleibt.
+    $src_image = clone $thumbnail['representative']['src_image'];
+    $thumbnail['representative']['src_image'] = $src_image;
+    bratonien_tools_watermark_album_cover_category($src_image, $category_id);
+  }
+  unset($thumbnail);
+
+  return $thumbnails;
+}
+
+function bratonien_tools_runtime_derivative_category_id($src_image)
+{
+  $category_id = bratonien_tools_runtime_category_id();
+  if ($category_id > 0)
+  {
+    return $category_id;
+  }
+
+  return bratonien_tools_watermark_album_cover_category($src_image);
+}
+
 function bratonien_tools_runtime_effective_rule($category_id)
 {
   static $categories = null;
@@ -230,7 +296,7 @@ function bratonien_tools_filter_derivative_url($url, $params, $src_image, $rel_u
     return $url;
   }
 
-  $rule = bratonien_tools_runtime_effective_rule(bratonien_tools_runtime_category_id());
+  $rule = bratonien_tools_runtime_effective_rule(bratonien_tools_runtime_derivative_category_id($src_image));
   if ($rule['mode'] !== 'profile' || empty($rule['profile_id']))
   {
     return $url;