Feature: Wintype-based focus exclusion

- Add "focus" to the wintypes settings in compton.conf, to mark windows
  of certain window types to be always focused. Replaces the ugly
  is_normal_win().

- Add a ON/OFF/UNSET switch_t type, but it's unused currently.

- Mark client_win if the window client detection hasn't been performed
  when we detect WM_STATE's presence in ev_property_notify(), for
  performance.

compton.sample.conf

@@ -47,5 +47,5 @@ focus-exclude = [ ];
 # Window type settings
 wintypes:
 {
-  tooltip = { fade = true; shadow = false; opacity = 0.75; };
+  tooltip = { fade = true; shadow = false; opacity = 0.75; focus = true; };
 };

src/compton.c

@@ -2034,7 +2034,7 @@ calc_opacity(session_t *ps, win *w) {
     }
 
     // Respect inactive_opacity in some cases
-    if (ps->o.inactive_opacity && is_normal_win(w) && false == w->focused
+    if (ps->o.inactive_opacity && false == w->focused
         && (OPAQUE == opacity || ps->o.inactive_opacity_override)) {
       opacity = ps->o.inactive_opacity;
     }
@@ -2054,7 +2054,7 @@ calc_dim(session_t *ps, win *w) {
   if (w->destroyed || IsViewable != w->a.map_state)
     return;
 
-  if (ps->o.inactive_dim && is_normal_win(w) && !(w->focused)) {
+  if (ps->o.inactive_dim && !(w->focused)) {
     dim = true;
   } else {
     dim = false;
@@ -3211,7 +3211,8 @@ ev_property_notify(session_t *ps, XPropertyEvent *ev) {
           determine_evmask(ps, ev->window, WIN_EVMODE_UNKNOWN));
 
       win *w_top = find_toplevel2(ps, ev->window);
-      if (w_top && w_top->client_win == w_top->id
+      // Initialize client_win as early as possible
+      if (w_top && (!w_top->client_win || w_top->client_win == w_top->id)
           && wid_has_prop(ps, ev->window, ps->atom_client)) {
         w_top->wmwin = false;
         win_unmark_client(ps, w_top);
@@ -3971,6 +3972,8 @@ parse_config(session_t *ps, char *cpath, struct options_tmp *pcfgtmp) {
           ps->o.wintype_shadow[i] = (bool) ival;
         if (config_setting_lookup_bool(setting, "fade", &ival))
           ps->o.wintype_fade[i] = (bool) ival;
+        if (config_setting_lookup_bool(setting, "focus", &ival))
+          ps->o.wintype_focus[i] = (bool) ival;
         config_setting_lookup_float(setting, "opacity",
             &ps->o.wintype_opacity[i]);
       }
@@ -4752,6 +4755,8 @@ session_init(session_t *ps_old, int argc, char **argv) {
       .inactive_dim = 0.0,
       .inactive_dim_fixed = false,
       .alpha_step = 0.03,
+
+      .wintype_focus = { false },
       .use_ewmh_active_win = false,
       .focus_blacklist = NULL,
 
@@ -4836,6 +4841,11 @@ session_init(session_t *ps_old, int argc, char **argv) {
   ps->ignore_tail = &ps->ignore_head;
   gettimeofday(&ps->time_start, NULL);
 
+  wintype_arr_enable(ps->o.wintype_focus);
+  ps->o.wintype_focus[WINTYPE_UNKNOWN] = false;
+  ps->o.wintype_focus[WINTYPE_NORMAL] = false;
+  ps->o.wintype_focus[WINTYPE_UTILITY] = false;
+
   get_cfg(ps, argc, argv);
 
   // Inherit old Display if possible, primarily for resource leak checking

src/compton.h

@@ -162,6 +162,13 @@ typedef enum {
   NUM_WINTYPES
 } wintype_t;
 
+/// Enumeration type to represent switches.
+typedef enum {
+  OFF,    // false
+  ON,     // true
+  UNSET
+} switch_t;
+
 typedef enum {
   WINDOW_SOLID,
   WINDOW_TRANS,
@@ -266,6 +273,7 @@ typedef struct {
   bool vsync_aggressive;
 
   // === Shadow ===
+  /// Enable/disable shadow for specific window types.
   bool wintype_shadow[NUM_WINTYPES];
   /// Red, green and blue tone of the shadow.
   double shadow_red, shadow_green, shadow_blue;
@@ -281,6 +289,7 @@ typedef struct {
   bool respect_prop_shadow;
 
   // === Fading ===
+  /// Enable/disable fading for specific window types.
   bool wintype_fade[NUM_WINTYPES];
   /// How much to fade in in a single fading step.
   opacity_t fade_in_step;
@@ -293,6 +302,7 @@ typedef struct {
   wincond_t *fade_blacklist;
 
   // === Opacity ===
+  /// Default opacity for specific window types
   double wintype_opacity[NUM_WINTYPES];
   /// Default opacity for inactive windows.
   /// 32-bit integer with the format of _NET_WM_OPACITY. 0 stands for
@@ -316,6 +326,8 @@ typedef struct {
   double alpha_step;
 
   // === Focus related ===
+  /// Consider windows of specific types to be always focused.
+  bool wintype_focus[NUM_WINTYPES];
   /// Whether to use EWMH _NET_ACTIVE_WINDOW to find active window.
   bool use_ewmh_active_win;
   /// A list of windows always to be considered focused.
@@ -764,7 +776,7 @@ sub_unslong(unsigned long a, unsigned long b) {
 /**
  * Set a <code>bool</code> array of all wintypes to true.
  */
-static void
+static inline void
 wintype_arr_enable(bool arr[]) {
   wintype_t i;
 
@@ -773,6 +785,18 @@ wintype_arr_enable(bool arr[]) {
   }
 }
 
+/**
+ * Set a <code>switch_t</code> array of all unset wintypes to true.
+ */
+static inline void
+wintype_arr_enable_unset(switch_t arr[]) {
+  wintype_t i;
+
+  for (i = 0; i < NUM_WINTYPES; ++i)
+    if (UNSET == arr[i])
+      arr[i] = ON;
+}
+
 /**
  * Allocate the space and copy a string.
  */
@@ -1147,11 +1171,6 @@ static Picture
 solid_picture(session_t *ps, bool argb, double a,
               double r, double g, double b);
 
-static inline bool is_normal_win(const win *w) {
-  return (WINTYPE_NORMAL == w->window_type
-      || WINTYPE_UTILITY == w->window_type);
-}
-
 /**
  * Determine if a window has a specific property.
  *
@@ -1439,8 +1458,10 @@ win_update_focused(session_t *ps, win *w) {
 
   w->focused = w->focused_real;
 
-  // Treat WM windows and override-redirected windows specially
+  // Use wintype_focus, and treat WM windows and override-redirected
-  if ((ps->o.mark_wmwin_focused && w->wmwin)
+  // windows specially
+  if (ps->o.wintype_focus[w->window_type]
+      || (ps->o.mark_wmwin_focused && w->wmwin)
       || (ps->o.mark_ovredir_focused
         && w->id == w->client_win && !w->wmwin)
       || win_match(w, ps->o.focus_blacklist, &w->cache_fcblst))