diff options
| author | Carlos Garnacho <carlosg@gnome.org> | 2022-12-13 13:41:22 +0100 |
|---|---|---|
| committer | Carlos Garnacho <carlosg@gnome.org> | 2023-01-20 22:23:55 +0000 |
| commit | 07e1f87e3bb08f9f562424adf86a569050850567 (patch) | |
| tree | d2e3f9d40abca5200ba0ba793562d7b4f14ff163 /src/x11 | |
| parent | 1f51dfa1126bcb9365bd7581376f871146aebe41 (diff) | |
| download | mutter-07e1f87e3bb08f9f562424adf86a569050850567.tar.gz | |
x11: Add function to know whether a client X11 window has an alpha channel
Since the windows created by the frames client will have a RGBA visual, we
no longer can perform simple tests about whether the window is opaque. For
that, we will need to additionally know whether the client-side window has
a visual with an alpha channel.
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2758>
Diffstat (limited to 'src/x11')
| -rw-r--r-- | src/x11/window-x11.c | 27 | ||||
| -rw-r--r-- | src/x11/window-x11.h | 2 |
2 files changed, 29 insertions, 0 deletions
diff --git a/src/x11/window-x11.c b/src/x11/window-x11.c index a21be1fff..8025e8444 100644 --- a/src/x11/window-x11.c +++ b/src/x11/window-x11.c @@ -4331,3 +4331,30 @@ meta_window_x11_check_update_resize (MetaWindow *window) window->display->grab_latest_motion_x, window->display->grab_latest_motion_y); } + +gboolean +meta_window_x11_has_alpha_channel (MetaWindow *window) +{ + MetaX11Display *x11_display = window->display->x11_display; + int n_xvisuals; + gboolean has_alpha; + XVisualInfo *xvisual_info; + XVisualInfo template = { + .visualid = XVisualIDFromVisual (window->xvisual), + }; + + xvisual_info = XGetVisualInfo (meta_x11_display_get_xdisplay (x11_display), + VisualIDMask, + &template, + &n_xvisuals); + if (!xvisual_info) + return FALSE; + + has_alpha = (xvisual_info->depth > + __builtin_popcount (xvisual_info->red_mask | + xvisual_info->green_mask | + xvisual_info->blue_mask)); + XFree (xvisual_info); + + return has_alpha; +} diff --git a/src/x11/window-x11.h b/src/x11/window-x11.h index f0e0b9a64..c00438c42 100644 --- a/src/x11/window-x11.h +++ b/src/x11/window-x11.h @@ -107,4 +107,6 @@ gboolean meta_window_x11_is_awaiting_sync_response (MetaWindow *window); void meta_window_x11_check_update_resize (MetaWindow *window); +gboolean meta_window_x11_has_alpha_channel (MetaWindow *window); + #endif |