X11: Use XFixesSetWindowShape to hide windows and disallow input

Author: leolost2605

lib/Utils.vala

@@ -400,5 +400,50 @@ namespace Gala {
 
             return texture;
         }
+
+        private static HashTable<Meta.Window, X.XserverRegion?> regions = new HashTable<Meta.Window, X.XserverRegion?> (null, null);
+
+        public static void x11_set_window_pass_through (Meta.Display display, Meta.Window window) {
+            unowned var x11_display = display.get_x11_display ();
+
+#if HAS_MUTTER46
+            var x_window = x11_display.lookup_xwindow (window);
+#else
+            var x_window = window.get_xwindow ();
+#endif
+            unowned var xdisplay = x11_display.get_xdisplay ();
+
+            regions[window] = X.Fixes.create_region_from_window (xdisplay, x_window, 0);
+
+            X.Xrectangle rect = {};
+
+            var region = X.Fixes.create_region (xdisplay, {rect});
+
+            X.Fixes.set_window_shape_region (xdisplay, x_window, 2, 0, 0, region);
+
+            X.Fixes.destroy_region (xdisplay, region);
+        }
+
+        public static void x11_unset_window_pass_through (Meta.Display display, Meta.Window window) {
+            unowned var x11_display = display.get_x11_display ();
+
+#if HAS_MUTTER46
+                var x_window = x11_display.lookup_xwindow (window);
+#else
+                var x_window = window.get_xwindow ();
+#endif
+            unowned var xdisplay = x11_display.get_xdisplay ();
+
+            var region = regions[window];
+
+            if (region == null) {
+                return;
+            }
+
+            X.Fixes.set_window_shape_region (xdisplay, x_window, 2, 0, 0, region);
+
+            regions.remove (window);
+            X.Fixes.destroy_region (xdisplay, region);
+        }
     }
 }

src/ShellClients/PanelClone.vala

@@ -127,6 +127,10 @@ public class Gala.PanelClone : Object {
 
         panel_hidden = true;
 
+        if (!Meta.Util.is_wayland_compositor ()) {
+            Utils.x11_set_window_pass_through (wm.get_display (), panel.window);
+        }
+
         if (panel.anchor != TOP && panel.anchor != BOTTOM) {
             warning ("Animated hide not supported for side yet.");
             return;
@@ -146,6 +150,10 @@ public class Gala.PanelClone : Object {
             return;
         }
 
+        if (!Meta.Util.is_wayland_compositor ()) {
+            Utils.x11_unset_window_pass_through (wm.get_display (), panel.window);
+        }
+
         clone.save_easing_state ();
         clone.set_easing_mode (Clutter.AnimationMode.EASE_OUT_QUAD);
         clone.set_easing_duration (get_animation_duration ());

vapi/xfixes-4.0.vapi

@@ -6,8 +6,12 @@ namespace X {
 	namespace Fixes {
 		[CCode (cheader_filename = "X11/extensions/Xfixes.h", cname = "XFixesCreateRegion")]
 		public static X.XserverRegion create_region (X.Display display, [CCode (array_length = true)] X.Xrectangle[] rectangles);
+		[CCode (cheader_filename = "X11/extensions/Xfixes.h", cname = "XFixesCreateRegionFromWindow")]
+		public static X.XserverRegion create_region_from_window (X.Display display, X.Window window, int shape_kind);
 		[CCode (cheader_filename = "X11/extensions/Xfixes.h", cname = "XFixesDestroyRegion")]
 		public static void destroy_region (X.Display display, X.XserverRegion region);
+		[CCode (cheader_filename = "X11/extensions/Xfixes.h", cname = "XFixesSetWindowShapeRegion")]
+        public static void set_window_shape_region (X.Display display, X.Window win, int shape_kind, int x_off, int y_off, XserverRegion region);
 	}
 	[SimpleType]
 	[CCode (cheader_filename = "X11/extensions/Xfixes.h", cname = "XserverRegion", has_type_id = false)]