wayland/pointer-constraints: Don't include window frame in region

When Xwayland confines, the surface dimensions will include the server
side window manager decorations. We don't want the decorations to be
included in the constraint region so intersect the calculated input
region with the parts of the buffer rect that is not part of the window
frame.

https://bugzilla.gnome.org/show_bug.cgi?id=771859

1 files changed, 22 insertions, 0 deletions

diff --git a/src/wayland/meta-wayland-pointer-constraints.c b/src/wayland/meta-wayland-pointer-constraints.c
index 68395b540..aa89aa0c2 100644
--- a/src/wayland/meta-wayland-pointer-constraints.c
+++ b/src/wayland/meta-wayland-pointer-constraints.c
@@ -41,6 +41,7 @@
 #include "backends/meta-backend-private.h"
 #include "backends/native/meta-backend-native.h"
 #include "backends/meta-pointer-constraint.h"
+#include "core/frame.h"
 
 #include "pointer-constraints-unstable-v1-server-protocol.h"
 
@@ -603,11 +604,32 @@ cairo_region_t *
 meta_wayland_pointer_constraint_calculate_effective_region (MetaWaylandPointerConstraint *constraint)
 {
   cairo_region_t *region;
+  MetaWindow *window;
 
   region = meta_wayland_surface_calculate_input_region (constraint->surface);
   if (constraint->region)
     cairo_region_intersect (region, constraint->region);
 
+  window = constraint->surface->window;
+  if (window && window->frame)
+    {
+      MetaFrame *frame = window->frame;
+      int actual_width, actual_height;
+
+      g_assert (meta_xwayland_is_xwayland_surface (constraint->surface));
+
+      actual_width = window->buffer_rect.width - (frame->child_x +
+                                                  frame->right_width);
+      actual_height = window->buffer_rect.height - (frame->child_y +
+                                                    frame->bottom_height);
+      cairo_region_intersect_rectangle (region, &(cairo_rectangle_int_t) {
+                                          .x = frame->child_x,
+                                          .y = frame->child_y,
+                                          .width = actual_width,
+                                          .height = actual_height
+                                        });
+    }
+
   return region;
 }