Only shadow ARGB windows with a frame outside the frame

An ARGB window with a frame is likely something like a transparent
terminal. It looks awful (and breaks transparency) to draw a big
opaque black shadow under the window, so clip out the region under
the terminal from the shadow we draw.

Add meta_window_get_frame_bounds() to get a cairo region for the
outer bounds of the frame of a window, and modify the frame handling
code to notice changes to the frame shape and discard a cached
region. meta_frames_apply_shapes() is refactored so we can extract
meta_frames_get_frame_bounds() from it.

https://bugzilla.gnome.org/show_bug.cgi?id=635268

NOTE: Applied only partially, compositor part is still missing...

upstream commit:
https://gitlab.gnome.org/GNOME/metacity/commit/0f2e32d1

1 files changed, 12 insertions, 0 deletions

diff --git a/src/ui/ui.c b/src/ui/ui.c
index bd753210..a7058066 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -452,6 +452,18 @@ meta_ui_apply_frame_shape  (MetaUI  *ui,
                             window_has_shape);
 }
 
+cairo_region_t *
+meta_ui_get_frame_bounds (MetaUI *ui,
+                          Window  xwindow,
+                          int     window_width,
+                          int     window_height)
+{
+  return meta_frames_get_frame_bounds (ui->frames,
+                                       xwindow,
+                                       window_width,
+                                       window_height);
+}
+
 void
 meta_ui_queue_frame_draw (MetaUI *ui,
                           Window xwindow)