backend-rdp: allow to force compression off

By default the client communicates its preference with regards to
compression to the server. However, some clients always use
compression, which is not ideal for certain environments (e.g.
low performance embedded devices in a local network with plenty
of bandwidth). Allow to disable compression server-side which will
override the clients request for compression.

Signed-off-by: Stefan Agner <stefan@agner.ch>

compositor/main.c

@@ -2508,6 +2508,7 @@ weston_rdp_backend_config_init(struct weston_rdp_backend_config *config)
 	config->server_key = NULL;
 	config->env_socket = 0;
 	config->no_clients_resize = 0;
+	config->force_no_compression = 0;
 }
 
 static int
@@ -2532,7 +2533,8 @@ load_rdp_backend(struct weston_compositor *c,
 		{ WESTON_OPTION_BOOLEAN, "no-clients-resize", 0, &config.no_clients_resize },
 		{ WESTON_OPTION_STRING,  "rdp4-key", 0, &config.rdp_key },
 		{ WESTON_OPTION_STRING,  "rdp-tls-cert", 0, &config.server_cert },
-		{ WESTON_OPTION_STRING,  "rdp-tls-key", 0, &config.server_key }
+		{ WESTON_OPTION_STRING,  "rdp-tls-key", 0, &config.server_key },
+		{ WESTON_OPTION_BOOLEAN, "force-no-compression", 0, &config.force_no_compression },
 	};
 
 	parse_options(rdp_options, ARRAY_LENGTH(rdp_options), argc, argv);

include/libweston/backend-rdp.h

@@ -65,6 +65,7 @@ struct weston_rdp_backend_config {
 	char *server_key;
 	int env_socket;
 	int no_clients_resize;
+	int force_no_compression;
 };
 
 #ifdef  __cplusplus

libweston/backend-rdp/rdp.c

@@ -131,6 +131,7 @@ struct rdp_backend {
 	char *rdp_key;
 	int tls_enabled;
 	int no_clients_resize;
+	int force_no_compression;
 };
 
 enum peer_item_flags {
@@ -971,6 +972,11 @@ xf_peer_activate(freerdp_peer* client)
 		return FALSE;
 	}
 
+	if (b->force_no_compression && settings->CompressionEnabled) {
+		weston_log("Forcing compression off\n");
+		settings->CompressionEnabled = FALSE;
+	}
+
 	if (output->base.width != (int)settings->DesktopWidth ||
 			output->base.height != (int)settings->DesktopHeight)
 	{
@@ -1364,6 +1370,7 @@ rdp_backend_create(struct weston_compositor *compositor,
 	b->base.create_output = rdp_output_create;
 	b->rdp_key = config->rdp_key ? strdup(config->rdp_key) : NULL;
 	b->no_clients_resize = config->no_clients_resize;
+	b->force_no_compression = config->force_no_compression;
 
 	compositor->backend = &b->base;
 
@@ -1447,6 +1454,7 @@ config_init_to_defaults(struct weston_rdp_backend_config *config)
 	config->server_key = NULL;
 	config->env_socket = 0;
 	config->no_clients_resize = 0;
+	config->force_no_compression = 0;
 }
 
 WL_EXPORT int