Improvement: ARGB window matching & Enable track_focus with D-Bus

- Add predefined matching target "argb" to match ARGB windows.

- Make it possible to enable focus tracking on-the-fly with D-Bus
  method.

c2.c

@@ -1042,6 +1042,7 @@ c2_match_once_leaf(session_t *ps, win *w, const c2_l_t *pleaf,
           switch (pleaf->predef) {
             case C2_L_PID:      tgt = wid;                      break;
             case C2_L_POVREDIR: tgt = w->a.override_redirect;   break;
+            case C2_L_PARGB:    tgt = (WMODE_ARGB == w->mode);  break;
             case C2_L_PFOCUSED: tgt = w->focused_real;          break;
             case C2_L_PWMWIN:   tgt = w->wmwin;                 break;
             case C2_L_PCLIENT:  tgt = w->client_win;            break;

c2.h

@@ -100,6 +100,7 @@ struct _c2_l {
     C2_L_PUNDEFINED,
     C2_L_PID,
     C2_L_POVREDIR,
+    C2_L_PARGB,
     C2_L_PFOCUSED,
     C2_L_PWMWIN,
     C2_L_PCLIENT,
@@ -175,6 +176,7 @@ typedef struct {
 const static c2_predef_t C2_PREDEFS[] = {
   [C2_L_PID         ] = { "id"                , C2_L_TCARDINAL  , 0  },
   [C2_L_POVREDIR    ] = { "override_redirect" , C2_L_TCARDINAL  , 0  },
+  [C2_L_PARGB       ] = { "argb"              , C2_L_TCARDINAL  , 0  },
   [C2_L_PFOCUSED    ] = { "focused"           , C2_L_TCARDINAL  , 0  },
   [C2_L_PWMWIN      ] = { "wmwin"             , C2_L_TCARDINAL  , 0  },
   [C2_L_PCLIENT     ] = { "client"            , C2_L_TWINDOW    , 0  },

common.h

@@ -1491,6 +1491,9 @@ win_set_focused_force(session_t *ps, win *w, switch_t val);
 
 void
 win_set_invert_color_force(session_t *ps, win *w, switch_t val);
+
+void
+opts_init_track_focus(session_t *ps);
 //!@}
 #endif
 

compton.c

@@ -1822,6 +1822,9 @@ map_win(session_t *ps, Window id) {
   // Make sure the XSelectInput() requests are sent
   XSync(ps->dpy, False);
 
+  // Update window mode here to do matching of ARGB
+  win_determine_mode(ps, w);
+
   // Detect client window here instead of in add_win() as the client
   // window should have been prepared at this point
   if (!w->client_win) {
@@ -1982,8 +1985,6 @@ win_determine_mode(session_t *ps, win *w) {
   winmode_t mode = WMODE_SOLID;
   XRenderPictFormat *format;
 
-  /* if trans prop == -1 fall back on previous tests */
-
   if (w->a.class == InputOnly) {
     format = 0;
   } else {
@@ -3247,6 +3248,29 @@ win_set_invert_color_force(session_t *ps, win *w, switch_t val) {
     win_determine_invert_color(ps, w);
   }
 }
+
+/**
+ * Enable focus tracking.
+ */
+void
+opts_init_track_focus(session_t *ps) {
+  // Already tracking focus
+  if (ps->o.track_focus)
+    return;
+
+  ps->o.track_focus = true;
+
+  if (!ps->o.use_ewmh_active_win) {
+    // Start listening to FocusChange events
+    for (win *w = ps->list; w; w = w->next)
+      if (IsViewable == w->a.map_state)
+        XSelectInput(ps->dpy, w->id,
+            determine_evmask(ps, w->id, WIN_EVMODE_FRAME));
+  }
+
+  // Recheck focus
+  recheck_focus(ps);
+}
 //!@}
 #endif
 

dbus.c

@@ -953,6 +953,18 @@ cdbus_process_opts_set(session_t *ps, DBusMessage *msg) {
     goto cdbus_process_opts_set_success;
   }
 
+  // track_focus
+  if (!strcmp("track_focus", target)) {
+    dbus_bool_t val = FALSE;
+    if (!cdbus_msg_get_arg(msg, 1, DBUS_TYPE_BOOLEAN, &val))
+      return false;
+    // You could enable this option, but never turn if off
+    if (val) {
+      opts_init_track_focus(ps);
+    }
+    goto cdbus_process_opts_set_success;
+  }
+
   // vsync
   if (!strcmp("vsync", target)) {
     const char * val = NULL;