win: store if transparent-clipping is enabled for window

Instead of storing if transparent-clipping is excluded for the window,
so later we don't need access `struct options::transparent_clipping`
to determine if transparent-clipping is enabled for a window.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/picom.c

@@ -1040,7 +1040,7 @@ static bool paint_preprocess(session_t *ps, bool *fade_running, bool *animation,
 		// we add the window region to the ignored region
 		// Otherwise last_reg_ignore shouldn't change
 		if ((w->mode != WMODE_TRANS && !ps->o.force_win_blend) ||
-		    (ps->o.transparent_clipping && !w->transparent_clipping_excluded)) {
+		    w->transparent_clipping) {
 			// w->mode == WMODE_SOLID or WMODE_FRAME_TRANS
 			region_t *tmp = rc_region_new();
 			if (w->mode == WMODE_SOLID) {

src/win.c

@@ -1385,8 +1385,9 @@ void win_on_factor_change(session_t *ps, struct managed_win *w) {
 
 	w->fade_excluded = c2_match(ps->c2_state, w, ps->o.fade_blacklist, NULL);
 
-	w->transparent_clipping_excluded =
-	    c2_match(ps->c2_state, w, ps->o.transparent_clipping_blacklist, NULL);
+	w->transparent_clipping =
+	    ps->o.transparent_clipping &&
+	    !c2_match(ps->c2_state, w, ps->o.transparent_clipping_blacklist, NULL);
 
 	win_update_opacity_target(ps, w);
 
@@ -1666,7 +1667,7 @@ struct win *attr_ret_nonnull maybe_allocate_managed_win(session_t *ps, struct wi
 	    .rounded_corners = false,
 	    .paint_excluded = false,
 	    .fade_excluded = false,
-	    .transparent_clipping_excluded = false,
+	    .transparent_clipping = false,
 	    .unredir_if_possible_excluded = false,
 	    .prop_shadow = -1,
 	    // following 4 are set in win_mark_client

src/win.h

@@ -240,7 +240,7 @@ struct managed_win {
 	bool fade_excluded;
 
 	/// Whether transparent clipping is excluded by the rules.
-	bool transparent_clipping_excluded;
+	bool transparent_clipping;
 
 	// Frame-opacity-related members
 	/// Current window frame opacity. Affected by window opacity.