Merge branch 'seletskiy-xinerama'

* Tweak some minor things.

1 files changed, 63 insertions, 0 deletions

diff --git a/source/x11-helper.c b/source/x11-helper.c
index 560ce39f..684f9855 100644
--- a/source/x11-helper.c
+++ b/source/x11-helper.c
@@ -37,7 +37,9 @@
 
 #include <xcb/xcb.h>
 #include <xcb/randr.h>
+#include <xcb/xinerama.h>
 #include <xcb/xcb_ewmh.h>
+#include <xcb/xproto.h>
 #include "xcb-internal.h"
 #include "xcb.h"
 #include "settings.h"
@@ -54,6 +56,8 @@
 #include "x11-helper.h"
 #include "xkb-internal.h"
 
+#define LOG_DOMAIN "X11Helper"
+
 struct _xcb_stuff xcb_int = {
     .connection = NULL,
     .screen     = NULL,
@@ -213,11 +217,70 @@ static workarea * x11_get_monitor_from_output ( xcb_randr_output_t out )
     return retv;
 }
 
+static int x11_is_extension_present (const char *extension) {
+    xcb_query_extension_cookie_t randr_cookie = xcb_query_extension ( xcb->connection, strlen(extension), extension);
+
+    xcb_query_extension_reply_t *randr_reply = xcb_query_extension_reply ( xcb->connection, randr_cookie, NULL);
+
+    int present = randr_reply->present;
+
+    free ( randr_reply );
+
+    return present;
+}
+
+static void x11_build_monitor_layout_xinerama () {
+    xcb_xinerama_query_screens_cookie_t screens_cookie = xcb_xinerama_query_screens_unchecked (
+        xcb->connection
+    );
+
+    xcb_xinerama_query_screens_reply_t *screens_reply = xcb_xinerama_query_screens_reply (
+        xcb->connection,
+        screens_cookie,
+        NULL
+    );
+
+    xcb_xinerama_screen_info_iterator_t screens_iterator = xcb_xinerama_query_screens_screen_info_iterator (
+        screens_reply
+    );
+
+    for ( ; screens_iterator.rem > 0; xcb_xinerama_screen_info_next (&screens_iterator) ) {
+        workarea *w = g_malloc0 ( sizeof ( workarea ) );
+
+        w->x = screens_iterator.data->x_org;
+        w->y = screens_iterator.data->y_org;
+        w->w = screens_iterator.data->width;
+        w->h = screens_iterator.data->height;
+
+        if ( w ) {
+            w->next       = xcb->monitors;
+            xcb->monitors = w;
+        }
+    }
+
+    int index = 0;
+    for ( workarea *iter = xcb->monitors; iter; iter = iter->next ) {
+        iter->monitor_id = index++;
+    }
+
+    free ( screens_reply );
+}
+
 void x11_build_monitor_layout ()
 {
     if ( xcb->monitors ) {
         return;
     }
+    // If RANDR is not available, try Xinerama
+    if ( !x11_is_extension_present ( "RANDR" ) ) {
+        // Check if xinerama is available.
+        if ( x11_is_extension_present ( "XINERAMA" ) ) {
+            g_log ( LOG_DOMAIN, G_LOG_LEVEL_DEBUG, "Using XINERAMA instead of XRANDR\n" );
+            x11_build_monitor_layout_xinerama ();
+        }
+        return;
+    }
+
     xcb_randr_get_screen_resources_current_reply_t  *res_reply;
     xcb_randr_get_screen_resources_current_cookie_t src;
     src       = xcb_randr_get_screen_resources_current ( xcb->connection, xcb->screen->root );