options: add corner-radius

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

man/picom.1.asciidoc

@@ -103,6 +103,9 @@ OPTIONS
 *--inactive-dim* 'VALUE'::
 	Dim inactive windows. (0.0 - 1.0, defaults to 0.0)
 
+*--corner-radius* 'VALUE'::
+	Sets the radius of rounded window corners. When > 0, the compositor will round the corners of windows.  (defaults to 0).
+
 *--mark-wmwin-focused*::
 	Try to detect WM windows (a non-override-redirect window with no child that has 'WM_STATE') and mark them as active.
 

src/config.c

@@ -537,6 +537,8 @@ char *parse_config(options_t *opt, const char *config_file, bool *shadow_enable,
 	    .shadow_ignore_shaped = false,
 	    .xinerama_shadow_crop = false,
 
+	    .corner_radius = 0,
+
 	    .fade_in_step = 0.028,
 	    .fade_out_step = 0.03,
 	    .fade_delta = 10,

src/config.h

@@ -217,6 +217,8 @@ typedef struct options {
 	c2_lptr_t *opacity_rules;
 	/// Limit window brightness
 	double max_brightness;
+	// Radius of rounded window corners
+	int corner_radius;
 
 	// === Focus related ===
 	/// Whether to try to detect WM windows and mark them as focused.

src/config_libconfig.c

@@ -374,6 +374,8 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
 	// --active_opacity
 	if (config_lookup_float(&cfg, "active-opacity", &dval))
 		opt->active_opacity = normalize_d(dval);
+	// --corner-radius
+	config_lookup_int(&cfg, "corner-radius", &opt->corner_radius);
 	// -e (frame_opacity)
 	config_lookup_float(&cfg, "frame-opacity", &opt->frame_opacity);
 	// -c (shadow_enable)

src/options.c

@@ -117,6 +117,10 @@ static void usage(const char *argv0, int ret) {
 	    "--active-opacity opacity\n"
 	    "  Default opacity for active windows. (0.0 - 1.0)\n"
 	    "\n"
+	    "--corner-radius value\n"
+	    "  Sets the radius of rounded window corners. When > 0, the compositor\n"
+	    "  will round the corners of windows. (defaults to 0).\n"
+	    "\n"
 	    "--mark-wmwin-focused\n"
 	    "  Try to detect WM windows and mark them as active.\n"
 	    "\n"
@@ -440,6 +444,7 @@ static const struct option longopts[] = {
     {"blur-deviation", required_argument, NULL, 330},
     {"blur-strength", required_argument, NULL, 331},
     {"shadow-color", required_argument, NULL, 332},
+    {"corner-radius", required_argument, NULL, 333},
     {"experimental-backends", no_argument, NULL, 733},
     {"monitor-repaint", no_argument, NULL, 800},
     {"diagnostics", no_argument, NULL, 801},
@@ -859,7 +864,10 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 			// --blur-strength
 			opt->blur_strength = atoi(optarg);
 			break;
-
+		case 333:
+			// --cornor-radius
+			opt->corner_radius = atoi(optarg);
+			break;
 		P_CASEBOOL(733, experimental_backends);
 		P_CASEBOOL(800, monitor_repaint);
 		case 801: opt->print_diagnostics = true; break;
@@ -986,6 +994,10 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 		         "properly under X Render backend.");
 	}
 
+	if (opt->corner_radius > 0) {
+		log_warn("Rounded corner is not implemented yet.");
+	}
+
 	return true;
 }
 

src/picom.c

@@ -669,6 +669,8 @@ static struct managed_win *paint_preprocess(session_t *ps, bool *fade_running) {
 			w->frame_opacity = 1.0;
 		}
 
+		w->corner_radius = ps->o.corner_radius;
+
 		// Update window mode
 		w->mode = win_calc_mode(w);
 

src/win.c

@@ -1413,6 +1413,8 @@ struct win *fill_win(session_t *ps, struct win *w) {
 	    // Initialized during paint
 	    .paint = PAINT_INIT,
 	    .shadow_paint = PAINT_INIT,
+
+	    .corner_radius = 0,
 	};
 
 	assert(!w->destroyed);

src/win.h

@@ -208,6 +208,9 @@ struct managed_win {
 	/// Last window opacity value set by the rules.
 	double opacity_set;
 
+	/// Radius of rounded window corners
+	int corner_radius;
+
 	// Fading-related members
 	/// Override value of window fade state. Set by D-Bus method calls.
 	switch_t fade_force;