[RP] [PATCH 3/7] Add primary screen detection

[Mathieu OTHACEHE]

The user may specify that a screen is primary with xrandr. Save this
information in ratpoison for future use.

The use of XRRGetOutputPrimary forces us to bump xrandr supported
revision from >=1.2 to >=1.3.
---
 src/data.h   |  1 +
 src/xrandr.c | 15 ++++++++++++++-
 src/xrandr.h |  1 +
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/data.h b/src/data.h
index eb662ce..08f1667 100644
--- a/src/data.h
+++ b/src/data.h
@@ -161,6 +161,7 @@ struct rp_global_screen
 struct xrandr_info {
   int output;
   int crtc;
+  int primary;
   struct sbuf* name;
 };
 
diff --git a/src/xrandr.c b/src/xrandr.c
index f1f3ef5..de0cde3 100644
--- a/src/xrandr.c
+++ b/src/xrandr.c
@@ -26,7 +26,7 @@
 static int xrandr_evbase;
 
 #define XRANDR_MAJOR 1
-#define XRANDR_MINOR 2
+#define XRANDR_MINOR 3
 
 void
 init_xrandr (void)
@@ -110,12 +110,19 @@ xrandr_screen_crtc (int rr_crtc)
   return NULL;
 }
 
+int
+xrandr_is_primary (rp_screen *screen)
+{
+  return screen->xrandr.primary;
+}
+
 void
 xrandr_fill_screen (int rr_output, rp_screen *screen)
 {
   XRRScreenResources *res;
   XRROutputInfo *outinfo;
   XRRCrtcInfo *crtinfo;
+  RROutput primary;
 
   res = XRRGetScreenResourcesCurrent (dpy, RootWindow (dpy, DefaultScreen 
(dpy)));
   outinfo = XRRGetOutputInfo (dpy, res, rr_output);
@@ -126,6 +133,12 @@ xrandr_fill_screen (int rr_output, rp_screen *screen)
   if (!crtinfo)
     goto free_out;
 
+  primary = XRRGetOutputPrimary (dpy, RootWindow (dpy, DefaultScreen (dpy)));
+  if (rr_output == primary)
+    screen->xrandr.primary = 1;
+  else
+    screen->xrandr.primary = 0;
+
   screen->xrandr.name = sbuf_new (0);
   sbuf_concat (screen->xrandr.name, outinfo->name);
 
diff --git a/src/xrandr.h b/src/xrandr.h
index d765789..25ff830 100644
--- a/src/xrandr.h
+++ b/src/xrandr.h
@@ -26,6 +26,7 @@
 
 void init_xrandr(void);
 int *xrandr_query_screen(int *screen_count);
+int xrandr_is_primary (rp_screen *screen);
 void xrandr_fill_screen(int rr_output, rp_screen *screen);
 void xrandr_notify(XEvent *ev);
 
-- 
2.10.0