From a8e19491ddee91c4885e0c3282c0f6448ad023b6 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Fri, 21 Oct 2022 09:51:55 +0200
Subject: [PATCH] gnome.eog: Support WebP files

A hack until gdk-pixbuf learns to support multiple cache files.
---
 pkgs/desktops/gnome/core/eog/default.nix | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pkgs/desktops/gnome/core/eog/default.nix b/pkgs/desktops/gnome/core/eog/default.nix
index ccb4d439240f9..e0a943a8e1ca3 100644
--- a/pkgs/desktops/gnome/core/eog/default.nix
+++ b/pkgs/desktops/gnome/core/eog/default.nix
@@ -22,6 +22,7 @@
 , shared-mime-info
 , wrapGAppsHook
 , librsvg
+, webp-pixbuf-loader
 , libexif
 , gobject-introspection
 , gi-docgen
@@ -78,6 +79,17 @@ stdenv.mkDerivation rec {
     "-Dgtk_doc=true"
   ];
 
+  postInstall = ''
+    # Pull in WebP support for gnome-backgrounds.
+    # In postInstall to run before gappsWrapperArgsHook.
+    export GDK_PIXBUF_MODULE_FILE="${gnome._gdkPixbufCacheBuilder_DO_NOT_USE {
+      extraLoaders = [
+        librsvg
+        webp-pixbuf-loader
+      ];
+    }}"
+  '';
+
   preFixup = ''
     gappsWrapperArgs+=(
       # Thumbnailers