Add rounded-corners-exclude configuration option

Allows the user to selectively disable rounded corners.

Authored-by: Samuel Hand <samuel.d.hand@gmail.com>

man/picom.1.asciidoc

@@ -106,6 +106,9 @@ OPTIONS
 *--corner-radius* 'VALUE'::
 	Sets the radius of rounded window corners. When > 0, the compositor will round the corners of windows.  (defaults to 0).
 
+*--rounded-corners-exclude* 'CONDITION'::
+	Exclude conditions for rounded corners.
+
 *--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

@@ -505,6 +505,7 @@ void set_default_winopts(options_t *opt, win_option_mask_t *mask, bool shadow_en
 
 char *parse_config(options_t *opt, const char *config_file, bool *shadow_enable,
                    bool *fading_enable, bool *hasneg, win_option_mask_t *winopt_mask) {
+	// clang-format off
 	*opt = (struct options){
 	    .backend = BKEND_XRENDER,
 	    .glx_no_stencil = false,
@@ -574,7 +575,10 @@ char *parse_config(options_t *opt, const char *config_file, bool *shadow_enable,
 	    .no_ewmh_fullscreen = false,
 
 	    .track_leader = false,
+
+	    .rounded_corners_blacklist = NULL
 	};
+	// clang-format on
 
 	char *ret = NULL;
 #ifdef CONFIG_LIBCONFIG

src/config.h

@@ -219,6 +219,8 @@ typedef struct options {
 	double max_brightness;
 	// Radius of rounded window corners
 	int corner_radius;
+	/// Rounded corners blacklist. A linked list of conditions.
+	c2_lptr_t *rounded_corners_blacklist;
 
 	// === Focus related ===
 	/// Whether to try to detect WM windows and mark them as focused.

src/config_libconfig.c

@@ -376,6 +376,8 @@ char *parse_config_libconfig(options_t *opt, const char *config_file, bool *shad
 		opt->active_opacity = normalize_d(dval);
 	// --corner-radius
 	config_lookup_int(&cfg, "corner-radius", &opt->corner_radius);
+	// --rounded-corners-exclude
+	parse_cfg_condlst(&cfg, &opt->rounded_corners_blacklist, "rounded-corners-exclude");
 	// -e (frame_opacity)
 	config_lookup_float(&cfg, "frame-opacity", &opt->frame_opacity);
 	// -c (shadow_enable)

src/options.c

@@ -121,6 +121,9 @@ static void usage(const char *argv0, int ret) {
 	    "  Sets the radius of rounded window corners. When > 0, the compositor\n"
 	    "  will round the corners of windows. (defaults to 0).\n"
 	    "\n"
+	    "--rounded-corners-exclude condition\n"
+	    "  Exclude conditions for rounded corners.\n"
+	    "\n"
 	    "--mark-wmwin-focused\n"
 	    "  Try to detect WM windows and mark them as active.\n"
 	    "\n"
@@ -445,6 +448,7 @@ static const struct option longopts[] = {
     {"blur-strength", required_argument, NULL, 331},
     {"shadow-color", required_argument, NULL, 332},
     {"corner-radius", required_argument, NULL, 333},
+    {"rounded-corners-exclude", required_argument, NULL, 334},
     {"experimental-backends", no_argument, NULL, 733},
     {"monitor-repaint", no_argument, NULL, 800},
     {"diagnostics", no_argument, NULL, 801},
@@ -868,6 +872,10 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 			// --cornor-radius
 			opt->corner_radius = atoi(optarg);
 			break;
+		case 334:
+			// --rounded-corners-exclude
+			condlst_add(&opt->rounded_corners_blacklist, optarg);
+			break;
 		P_CASEBOOL(733, experimental_backends);
 		P_CASEBOOL(800, monitor_repaint);
 		case 801: opt->print_diagnostics = true; break;

src/picom.c

@@ -669,8 +669,6 @@ 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);
 
@@ -1889,6 +1887,7 @@ static session_t *session_init(int argc, char **argv, Display *dpy,
 	      c2_list_postprocess(ps, ps->o.blur_background_blacklist) &&
 	      c2_list_postprocess(ps, ps->o.invert_color_list) &&
 	      c2_list_postprocess(ps, ps->o.opacity_rules) &&
+	      c2_list_postprocess(ps, ps->o.rounded_corners_blacklist) &&
 	      c2_list_postprocess(ps, ps->o.focus_blacklist))) {
 		log_error("Post-processing of conditionals failed, some of your rules "
 		          "might not work");
@@ -2266,6 +2265,7 @@ static void session_destroy(session_t *ps) {
 	free_wincondlst(&ps->o.opacity_rules);
 	free_wincondlst(&ps->o.paint_blacklist);
 	free_wincondlst(&ps->o.unredir_if_possible_blacklist);
+	free_wincondlst(&ps->o.rounded_corners_blacklist);
 
 	// Free tracked atom list
 	{

src/render.c

@@ -358,7 +358,7 @@ paint_region(session_t *ps, const struct managed_win *w, int x, int y, int wid,
 	const bool neg = (w && w->invert_color);
 
 	render(ps, x, y, dx, dy, wid, hei, fullwid, fullhei, opacity, argb, neg,
-	       (w ? w->corner_radius : 0), pict,
+	       w ? w->corner_radius : 0, pict,
 	       (w ? w->paint.ptex : ps->root_tile_paint.ptex), reg_paint,
 #ifdef CONFIG_OPENGL
 	       w ? &ps->glx_prog_win : NULL

src/win.c

@@ -1033,6 +1033,26 @@ static void win_determine_blur_background(session_t *ps, struct managed_win *w)
 	win_set_blur_background(ps, w, blur_background_new);
 }
 
+/**
+ * Determine if a window should have rounded corners.
+ */
+static void win_determine_rounded_corners(session_t *ps, struct managed_win *w) {
+	if (ps->o.corner_radius == 0) {
+		w->corner_radius = 0;
+		return;
+	}
+
+	// Don't round full screen windows & excluded windows
+	if ((w && win_is_fullscreen(ps, w)) ||
+	    c2_match(ps, w, ps->o.rounded_corners_blacklist, NULL)) {
+		w->corner_radius = 0;
+		log_debug("Not rounding corners for window %#010x", w->base.id);
+	} else {
+		w->corner_radius = ps->o.corner_radius;
+		log_debug("Rounding corners for window %#010x", w->base.id);
+	}
+}
+
 /**
  * Update window opacity according to opacity rules.
  */
@@ -1067,6 +1087,7 @@ void win_on_factor_change(session_t *ps, struct managed_win *w) {
 	win_determine_shadow(ps, w);
 	win_determine_invert_color(ps, w);
 	win_determine_blur_background(ps, w);
+	win_determine_rounded_corners(ps, w);
 	w->mode = win_calc_mode(w);
 	log_debug("Window mode changed to %d", w->mode);
 	win_update_opacity_rule(ps, w);