introduce get_xinerama_screen_bycoord(...)

this allows to retrieve the xinerama screen of a client with its coordinates

client.h

@@ -54,7 +54,7 @@ struct Client
     Window win;
     /** Client display */
     Display *display;
-    /** Client screen */
+    /** Client screen (Zaphod) */
     int screen;
     /** First time viewed on new layout */
     Bool ftview;

event.c

@@ -60,7 +60,7 @@ movemouse(Client * c, awesome_config *awesomeconf)
     XEvent ev;
     ScreenInfo *si;
 
-    si = get_screen_info(c->display, c->screen, awesomeconf->statusbar, &x1);
+    si = get_screen_info(c->display, c->screen, &awesomeconf->statusbar, &x1);
 
     ocx = nx = c->x;
     ocy = ny = c->y;

layout.c

@@ -225,7 +225,7 @@ uicb_togglemax(Display *disp,
                const char *arg __attribute__ ((unused)))
 {
     int dummy;
-    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, awesomeconf->statusbar, &dummy);
+    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, &awesomeconf->statusbar, &dummy);
 
     maximize(si[awesomeconf->screen].x_org, si[awesomeconf->screen].y_org,
              si[awesomeconf->screen].width - 2 * awesomeconf->borderpx,
@@ -241,7 +241,7 @@ uicb_toggleverticalmax(Display *disp,
                        const char *arg __attribute__ ((unused)))
 {
     int dummy;
-    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, awesomeconf->statusbar, &dummy);
+    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, &awesomeconf->statusbar, &dummy);
 
     if(sel)
         maximize(sel->x, si[awesomeconf->screen].y_org,
@@ -258,7 +258,7 @@ uicb_togglehorizontalmax(Display *disp,
                          const char *arg __attribute__ ((unused)))
 {
     int dummy;
-    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, awesomeconf->statusbar, &dummy);
+    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, &awesomeconf->statusbar, &dummy);
 
     if(sel)
         maximize(si[awesomeconf->screen].x_org, sel->y,

layouts/max.c

@@ -31,7 +31,7 @@ layout_max(Display *disp, awesome_config *awesomeconf)
 {
     Client *c;
     int screen_number = 0, use_screen = 0;
-    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, awesomeconf->statusbar, &screen_number);
+    ScreenInfo *si = get_screen_info(disp, awesomeconf->screen, &awesomeconf->statusbar, &screen_number);
 
     for(c = clients; c; c = c->next)
         if(IS_TILED(c, awesomeconf->screen, awesomeconf->tags, awesomeconf->ntags))

layouts/tile.c

@@ -93,7 +93,7 @@ _tile(Display *disp, awesome_config *awesomeconf, const Bool right)
     ScreenInfo *screens_info = NULL;
     Client *c;
 
-    screens_info = get_screen_info(disp, awesomeconf->screen, awesomeconf->statusbar, &screen_numbers);
+    screens_info = get_screen_info(disp, awesomeconf->screen, &awesomeconf->statusbar, &screen_numbers);
  
     for(n = 0, c = clients; c; c = c->next)
         if(IS_TILED(c, awesomeconf->screen, awesomeconf->tags, awesomeconf->ntags))

screen.c

@@ -34,7 +34,7 @@ extern Client *sel, *clients;
  * \return ScreenInfo struct array with all screens info
  */
 ScreenInfo *
-get_screen_info(Display *disp, int screen, Statusbar statusbar, int *screen_number)
+get_screen_info(Display *disp, int screen, Statusbar *statusbar, int *screen_number)
 {
     int i, fake_screen_number = 0;
     ScreenInfo *si;
@@ -56,14 +56,15 @@ get_screen_info(Display *disp, int screen, Statusbar statusbar, int *screen_numb
         fake_screen_number = screen + 1;
     }
 
-    for(i = 0; i < fake_screen_number; i++)
-    {
-        if(statusbar.position == BarTop 
-           || statusbar.position == BarBot)
-            si[i].height -= statusbar.height;
-        if(statusbar.position == BarTop)
-            si[i].y_org += statusbar.height;
-    }
+    if(statusbar)
+        for(i = 0; i < fake_screen_number; i++)
+        {
+            if(statusbar->position == BarTop 
+               || statusbar->position == BarBot)
+                si[i].height -= statusbar->height;
+            if(statusbar->position == BarTop)
+                si[i].y_org += statusbar->height;
+        }
     
     return si;
 }
@@ -90,6 +91,36 @@ get_display_info(Display *disp, int screen, Statusbar statusbar)
     return si;
 }
 
+/** Return the Xinerama screen number where the window is placed
+ * \param disp Display ref
+ * \param x x coordinate of the window
+ * \param y y coordinate of the window
+ * \return screen number or -1 on no match
+ */
+int
+get_screen_bycoord(Display *disp, int x, int y)
+{
+    ScreenInfo *si;
+    int screen_number, i;
+
+    /* don't waste our time */
+    if(!XineramaIsActive(disp))
+        return 0;
+
+    si = get_screen_info(disp, 0, NULL, &screen_number);
+
+    for(i = 0; i < screen_number; i++)
+        if(x >= si[i].x_org && x <= si[i].x_org + si[i].width
+           && y >= si[i].y_org && y <= si[i].x_org + si[i].height)
+        {
+            XFree(si);
+            return i;
+        }
+
+    XFree(si);
+    return -1;
+}
+
 void
 uicb_focusnextscreen(Display *disp,
                      DC *drawcontext,

screen.h

@@ -28,8 +28,9 @@
 
 typedef XineramaScreenInfo ScreenInfo;
 
-ScreenInfo * get_screen_info(Display *, int, Statusbar, int *);
-ScreenInfo * get_display_info(Display *disp, int, Statusbar statusbar);
+ScreenInfo * get_screen_info(Display *, int, Statusbar *, int *);
+ScreenInfo * get_display_info(Display *, int, Statusbar);
+int get_screen_bycoord(Display *, int, int);
 UICB_PROTO(uicb_focusnextscreen);
 UICB_PROTO(uicb_focusprevscreen);