options: add --no-vsync command line option

Otherwise there is no way to override the settings in the config file.

Signed-off-by: Yuxuan Shui <[email protected]>

man/compton.1.asciidoc

@@ -130,8 +130,8 @@ OPTIONS
 *--refresh-rate* 'REFRESH_RATE'::
 	Specify refresh rate of the screen. If not specified or 0, compton will try detecting this with X RandR extension.
 
-*--vsync*::
-	Enable VSync.
+*--vsync*, *--no-vsync*::
+	Enable/disable VSync.
 
 *--sw-opti*::
 	Limit compton to repaint at most once every 1 / 'refresh_rate' second to boost performance. This should not be used with *--vsync* drm/opengl/opengl-oml as they essentially does *--sw-opti*'s job already, unless you wish to specify a lower refresh rate than the actual value.
@@ -166,7 +166,7 @@ OPTIONS
 *--detect-client-leader*::
 	Use 'WM_CLIENT_LEADER' to group windows, and consider windows in the same group focused at the same time. 'WM_TRANSIENT_FOR' has higher priority if *--detect-transient* is enabled, too.
 
-*--blur-method, --blur-size, --blur-deviation*::
+*--blur-method*, *--blur-size*, *--blur-deviation*::
 	Parameters for background blurring, see the *BLUR* section for more information.
 
 *--blur-background*::

src/options.c

@@ -411,6 +411,7 @@ static const struct option longopts[] = {
     {"log-file", required_argument, NULL, 322},
     {"use-damage", no_argument, NULL, 323},
     {"no-use-damage", no_argument, NULL, 324},
+    {"no-vsync", no_argument, NULL, 325},
     {"experimental-backends", no_argument, NULL, 733},
     {"monitor-repaint", no_argument, NULL, 800},
     {"diagnostics", no_argument, NULL, 801},
@@ -789,6 +790,9 @@ void get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 		case 324:
 			opt->use_damage = false;
 			break;
+		case 325:
+			opt->vsync = false;
+			break;
 		P_CASEBOOL(733, experimental_backends);
 		P_CASEBOOL(800, monitor_repaint);
 		case 801: opt->print_diagnostics = true; break;