xfce.tumbler, xfce.ristretto: enable JXL and WebP support (#340472)

pkgs/desktops/xfce/applications/ristretto/default.nix

@@ -2,9 +2,13 @@
 , mkXfceDerivation
 , gtk3
 , glib
+, gnome
 , libexif
+, libjxl
+, librsvg
 , libxfce4ui
 , libxfce4util
+, webp-pixbuf-loader
 , xfconf
 }:
 
@@ -27,6 +31,18 @@ mkXfceDerivation {
 
   env.NIX_CFLAGS_COMPILE = "-I${glib.dev}/include/gio-unix-2.0";
 
+  postInstall = ''
+    # Pull in JXL and WebP support for ristretto.
+    # In postInstall to run before gappsWrapperArgsHook.
+    export GDK_PIXBUF_MODULE_FILE="${gnome._gdkPixbufCacheBuilder_DO_NOT_USE {
+      extraLoaders = [
+        libjxl
+        librsvg
+        webp-pixbuf-loader
+      ];
+    }}"
+  '';
+
   meta = with lib; {
     description = "Fast and lightweight picture-viewer for the Xfce desktop environment";
     mainProgram = "ristretto";

pkgs/desktops/xfce/core/tumbler/default.nix

@@ -6,6 +6,8 @@
 , freetype
 , libgepub
 , libgsf
+, libjxl
+, librsvg
 , poppler
 , gst_all_1
 , webp-pixbuf-loader
@@ -35,7 +37,8 @@ mkXfceDerivation {
 
   preFixup = ''
     gappsWrapperArgs+=(
-      --prefix XDG_DATA_DIRS : "${webp-pixbuf-loader}/share"
+      # Thumbnailers
+      --prefix XDG_DATA_DIRS : "${lib.makeSearchPath "share" [ libjxl librsvg webp-pixbuf-loader ]}"
     )
   '';