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xwayland: Add helper function for fractional scaling 

Fractional scaling may not be available, or not suitable for the current
configuration (e.g. if running rootless).

Add a helper function to tell whether fractional scaling should be used.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-By: Kenny Levinsen <kl@kl.wtf>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1197>
This commit is contained in:
Olivier Fourdan 2023-11-27 13:57:58 +01:00
parent 7a78756d0a
commit 3e77c1699a
2 changed files with 24 additions and 0 deletions
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23
hw/xwayland/xwayland-screen.c
View File

@ -773,6 +773,26 @@ xwl_screen_lost_focus(struct xwl_screen *xwl_screen)
}
}
Bool
xwl_screen_should_use_fractional_scale(struct xwl_screen *xwl_screen)
{
/* Fullscreen uses a viewport already */
if (xwl_screen->fullscreen)
return FALSE;
if (xwl_screen->rootless)
return FALSE;
/* We need both fractional scale and viewporter protocols */
if (!xwl_screen->fractional_scale_manager)
return FALSE;
if (!xwl_screen->viewporter)
return FALSE;
return xwl_screen->hidpi;
}
Bool
xwl_screen_update_global_surface_scale(struct xwl_screen *xwl_screen)
{
@ -780,6 +800,9 @@ xwl_screen_update_global_surface_scale(struct xwl_screen *xwl_screen)
struct xwl_window *xwl_window;
int32_t old_scale;
if (xwl_screen_should_use_fractional_scale(xwl_screen))
return FALSE;
if (xwl_screen->rootless)
return FALSE;

1
hw/xwayland/xwayland-screen.h
View File

@ -173,5 +173,6 @@ void xwl_surface_damage(struct xwl_screen *xwl_screen,
int xwl_screen_get_next_output_serial(struct xwl_screen * xwl_screen);
void xwl_screen_lost_focus(struct xwl_screen *xwl_screen);
Bool xwl_screen_update_global_surface_scale(struct xwl_screen *xwl_screen);
Bool xwl_screen_should_use_fractional_scale(struct xwl_screen *xwl_screen);
#endif /* XWAYLAND_SCREEN_H */