rootston: add -D flag to enable damage tracking debugging

include/rootston/config.h

@@ -66,8 +66,10 @@ struct roots_config {
 	struct wl_list bindings;
 	struct wl_list keyboards;
 	struct wl_list cursors;
+
 	char *config_path;
 	char *startup_cmd;
+	bool debug_damage_tracking;
 };
 
 /**

rootston/config.c

@@ -25,7 +25,9 @@ static void usage(const char *name, int ret) {
 		"                (default: rootston.ini).\n"
 		"                See `rootston.ini.example` for config\n"
 		"                file documentation.\n"
-		" -E <COMMAND>   Command that will be ran at startup.\n" , name);
+		" -E <COMMAND>   Command that will be ran at startup.\n"
+		" -D             Enable damage tracking debugging.\n",
+		name);
 
 	exit(ret);
 }
@@ -394,7 +396,7 @@ struct roots_config *roots_config_create_from_args(int argc, char *argv[]) {
 	wl_list_init(&config->bindings);
 
 	int c;
-	while ((c = getopt(argc, argv, "C:E:h")) != -1) {
+	while ((c = getopt(argc, argv, "C:E:hD")) != -1) {
 		switch (c) {
 		case 'C':
 			config->config_path = strdup(optarg);
@@ -402,6 +404,9 @@ struct roots_config *roots_config_create_from_args(int argc, char *argv[]) {
 		case 'E':
 			config->startup_cmd = strdup(optarg);
 			break;
+		case 'D':
+			config->debug_damage_tracking = true;
+			break;
 		case 'h':
 		case '?':
 			usage(argv[0], c != 'h');

rootston/output.c

@@ -486,8 +486,9 @@ static void render_output(struct roots_output *output) {
 		goto renderer_end;
 	}
 
-	// Uncomment this line to debug damage tracking
-	//wlr_renderer_clear(renderer, (float[]){1, 1, 0, 0});
+	if (server->config->debug_damage_tracking) {
+		wlr_renderer_clear(renderer, (float[]){1, 1, 0, 0});
+	}
 
 	int nrects;
 	pixman_box32_t *rects = pixman_region32_rectangles(&damage, &nrects);