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backends/x11: Split up X11 backend into Cm and Nested

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Split up the X11 backend into two parts, one for running as a
Compositing Manager, and one for running as a nested Wayland
compositor.

This commit also cleans up the compositor configuration calculation,
attempting to make it more approachable.

https://bugzilla.gnome.org/show_bug.cgi?id=777800
This commit is contained in:
Jonas Ådahl
2017-01-27 23:04:02 +08:00
parent 042a95ef98
commit 6d64123849
8 changed files with 512 additions and 221 deletions
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70
src/core/main.c
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@@ -80,10 +80,12 @@
#ifdef HAVE_WAYLAND
#include "wayland/meta-wayland.h"
#include "backends/x11/nested/meta-backend-x11-nested.h"
# endif
#include "backends/meta-backend-private.h"
#include "backends/x11/meta-backend-x11.h"
#include "backends/x11/cm/meta-backend-x11-cm.h"
#ifdef HAVE_NATIVE_BACKEND
#include "backends/native/meta-backend-native.h"
@@ -397,6 +399,26 @@ check_for_wayland_session_type (void)
}
#endif
/*
* Determine the compositor configuration, i.e. whether to run as a Wayland
* compositor, as well as what backend to use.
*
* There are various different flags affecting this:
*
* --nested always forces the use of the nested X11 backend
* --display-server always forces the use of the native backend
* --wayland always forces the compositor type to be a Wayland compositor
*
* If no flag is passed that forces the compositor type, the compositor type
* is determined first from the logind session type, or if that fails, from the
* XDG_SESSION_TYPE enviornment variable.
*
* If no flag is passed that forces the backend type, the backend type is
* determined given the compositor type. If the compositor is a Wayland
* compositor, then the native backend is used, or the nested backend, would
* the native backend not be enabled at build time. If the compositor is not a
* Wayland compositor, then the X11 Compositing Manager backend is used.
*/
static void
calculate_compositor_configuration (MetaCompositorType *compositor_type,
GType *backend_gtype)
@@ -413,22 +435,48 @@ calculate_compositor_configuration (MetaCompositorType *compositor_type,
if (!run_as_wayland_compositor)
run_as_wayland_compositor = check_for_wayland_session_type ();
#endif /* HAVE_NATIVE_BACKEND */
#ifdef CLUTTER_WINDOWING_EGL
if (opt_display_server || (run_as_wayland_compositor && !opt_nested))
*backend_gtype = META_TYPE_BACKEND_NATIVE;
else
#endif
#endif
#endif
*backend_gtype = META_TYPE_BACKEND_X11;
#ifdef HAVE_WAYLAND
if (run_as_wayland_compositor)
*compositor_type = META_COMPOSITOR_TYPE_WAYLAND;
else
#endif
#endif /* HAVE_WAYLAND */
*compositor_type = META_COMPOSITOR_TYPE_X11;
if (opt_nested)
{
*backend_gtype = META_TYPE_BACKEND_X11_NESTED;
return;
}
#ifdef HAVE_NATIVE_BACKEND
if (opt_display_server)
{
*backend_gtype = META_TYPE_BACKEND_NATIVE;
return;
}
#ifdef HAVE_WAYLAND
if (run_as_wayland_compositor)
{
*backend_gtype = META_TYPE_BACKEND_NATIVE;
return;
}
#endif /* HAVE_WAYLAND */
#endif /* HAVE_NATIVE_BACKEND */
#ifdef HAVE_WAYLAND
if (run_as_wayland_compositor)
{
*backend_gtype = META_TYPE_BACKEND_X11_NESTED;
return;
}
else
#endif /* HAVE_WAYLAND */
{
*backend_gtype = META_TYPE_BACKEND_X11_CM;
return;
}
}
static gboolean _compositor_configuration_overridden = FALSE;