Add option to tweak inactive window blur opacity

src/backend/backend.c

@@ -483,12 +483,8 @@ void paint_all_new(session_t *ps, struct managed_win *t, bool ignore_damage) {
 
 			// Blur window
 			if (w->blur_foreground) {
-				// FIXME Think more about combining blur w/ opacity
-				// FIXME Don't hardcode opacity
-				//        - needs to be set when focus_mode set to true
-				double blur_opacity = 1;
 				ps->backend_data->ops->blur(
-				    ps->backend_data, blur_opacity,
+				    ps->backend_data, ps->o.inactive_blur_opacity,
 				    ps->backend_blur_fgcontext, w->mask_image, window_coord,
 				    &reg_paint_in_bound, &reg_visible);
 			}

src/config.c

@@ -766,6 +766,7 @@ char *parse_config(options_t *opt, const char *config_file, bool *shadow_enable,
 
 	    .inactive_blur = false,
 	    .inactive_blur_list = NULL,
+	    .inactive_blur_opacity = 1.0,
 	    .inactive_dim = 0.0,
 	    .inactive_dim_fixed = false,
 	    .inactive_opacity = 1.0,

src/config.h

@@ -213,8 +213,10 @@ typedef struct options {
 	char *window_shader_fg;
 	/// Rules to change custom fragment shader for painting windows.
 	c2_lptr_t *window_shader_fg_rules;
-	/// Whether to blur inactive windows
+	/// Whether to blur inactive window foregrounds
 	bool inactive_blur;
+	// Opacity of inactive foreground blurs
+	double inactive_blur_opacity;
 	/// List of windows that should be blurred out when inactive.
 	c2_lptr_t *inactive_blur_list;
 	/// How much to dim an inactive window. 0.0 - 1.0, 0 to disable.

src/config_libconfig.c

@@ -544,6 +544,7 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
 	// --inactive-blur
 	if (lcfg_lookup_bool(&cfg, "inactive-blur", &opt->inactive_blur)) {
 		parse_cfg_condlst(&cfg, &opt->inactive_blur_list, "inactive-blur-include");
+		config_lookup_float(&cfg, "inactive-blur-opacity", &opt->inactive_blur_opacity);
 	}
 	// --resize-damage
 	config_lookup_int(&cfg, "resize-damage", &opt->resize_damage);

src/options.c

@@ -61,6 +61,7 @@ static const struct picom_option picom_options[] = {
     {"inactive-blur-include"       , required_argument, 342, NULL          , "Conditions for windows that should be fully blurred when inactive."
                                                                              "When --inactive-blur is enabled without an --inactive-blur-include"
                                                                              "condition, the foreground of ALL inactive windows will be blurred."},
+    {"inactive-blur-opacity"       , required_argument, 343, NULL          , "Set the opacity of inactive foreground blurs"},
     {"mark-wmwin-focused"          , no_argument      , 262, NULL          , "Try to detect WM windows and mark them as active."},
     {"shadow-exclude"              , required_argument, 263, NULL          , "Exclude conditions for shadows."},
     {"mark-ovredir-focused"        , no_argument      , 264, NULL          , "Mark windows that have no WM frame as active."},
@@ -750,6 +751,10 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 			// --inactive-blur-include
 			condlst_add(&opt->inactive_blur_list, optarg);
 			break;
+		case 343:
+			// --inactive-blur-opacity
+			opt->inactive_blur_opacity = normalize_d(atof(optarg));
+			break;
 		P_CASEBOOL(733, legacy_backends);
 		P_CASEBOOL(800, monitor_repaint);
 		case 801: