compositor-wayland: Refactor struct wayland_output::name usage

struct wayland_output::name was used but never initialized.
Also zxdg_toplevel_v6_set_title was only called for windowed outputs,
and some compositors let you see the client's name even when it is
fullscreen (GNOME Shell's Activities menu for example).

So rename struct wayland_output::name to struct wayland_output::title and
precompute it on wayland_output_create_common(), so it can be later used
on xdg's set_title and frame_create.

v2: Move zxdg_toplevel_v6_set_title() before the wl_surface_commit()
as per Quentin Glidic's suggestion.

Signed-off-by: Sergi Granell <xerpi.g.12@gmail.com>
Reviewed-by: Armin Krezović <krezovic.armin@gmail.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>

libweston/compositor-wayland.c

@@ -111,7 +111,7 @@ struct wayland_output {
 
 	int keyboard_count;
 
-	char *name;
+	char *title;
 	struct frame *frame;
 
 	struct {
@@ -708,6 +708,7 @@ wayland_output_destroy(struct weston_output *base)
 	if (output->frame_cb)
 		wl_callback_destroy(output->frame_cb);
 
+	free(output->title);
 	free(output);
 }
 
@@ -835,36 +836,17 @@ wayland_output_set_windowed(struct wayland_output *output)
 {
 	struct wayland_backend *b =
 		to_wayland_backend(output->base.compositor);
-	int tlen;
-	char *title;
 
 	if (output->frame)
 		return 0;
 
-	if (output->name) {
-		tlen = strlen(output->name) + strlen(WINDOW_TITLE " - ");
-		title = malloc(tlen + 1);
-		if (!title)
-			return -1;
-
-		snprintf(title, tlen + 1, WINDOW_TITLE " - %s", output->name);
-	} else {
-		title = strdup(WINDOW_TITLE);
-	}
-
-	if (output->parent.xdg_toplevel)
-		zxdg_toplevel_v6_set_title(output->parent.xdg_toplevel, title);
-
 	if (!b->theme) {
 		b->theme = theme_create();
-		if (!b->theme) {
-			free(title);
+		if (!b->theme)
 			return -1;
-		}
 	}
 	output->frame = frame_create(b->theme, 100, 100,
-				     FRAME_BUTTON_CLOSE, title);
-	free(title);
+				     FRAME_BUTTON_CLOSE, output->title);
 	if (!output->frame)
 		return -1;
 
@@ -1132,6 +1114,8 @@ wayland_backend_create_output_surface(struct wayland_output *output)
 		zxdg_toplevel_v6_add_listener(output->parent.xdg_toplevel,
 					      &xdg_toplevel_listener, output);
 
+		zxdg_toplevel_v6_set_title(output->parent.xdg_toplevel, output->title);
+
 		wl_surface_commit(output->parent.surface);
 
 		output->parent.wait_for_configure = true;
@@ -1239,9 +1223,13 @@ err_output:
 }
 
 static struct wayland_output *
-wayland_output_create_common(void)
+wayland_output_create_common(const char *name)
 {
 	struct wayland_output *output;
+	size_t len;
+
+	/* name can't be NULL. */
+	assert(name);
 
 	output = zalloc(sizeof *output);
 	if (output == NULL) {
@@ -1252,6 +1240,18 @@ wayland_output_create_common(void)
 	output->base.destroy = wayland_output_destroy;
 	output->base.disable = wayland_output_disable;
 	output->base.enable = wayland_output_enable;
+	output->base.name = strdup(name);
+
+	/* setup output name/title. */
+	len = strlen(WINDOW_TITLE " - ") + strlen(name) + 1;
+	output->title = zalloc(len);
+	if (!output->title) {
+		free(output->base.name);
+		free(output);
+		return NULL;
+	}
+
+	snprintf(output->title, len, WINDOW_TITLE " - %s", name);
 
 	return output;
 }
@@ -1259,12 +1259,7 @@ wayland_output_create_common(void)
 static int
 wayland_output_create(struct weston_compositor *compositor, const char *name)
 {
-	struct wayland_output *output = wayland_output_create_common();
-
-	/* name can't be NULL. */
-	assert(name);
-
-	output->base.name = strdup(name);
+	struct wayland_output *output = wayland_output_create_common(name);
 
 	weston_output_init(&output->base, compositor);
 	weston_compositor_add_pending_output(&output->base, compositor);
@@ -1324,11 +1319,9 @@ static int
 wayland_output_create_for_parent_output(struct wayland_backend *b,
 					struct wayland_parent_output *poutput)
 {
-	struct wayland_output *output = wayland_output_create_common();
+	struct wayland_output *output = wayland_output_create_common("wlparent");
 	struct weston_mode *mode;
 
-	output->base.name = strdup("wlparent");
-
 	if (poutput->current_mode) {
 		mode = poutput->current_mode;
 	} else if (poutput->preferred_mode) {
@@ -1364,7 +1357,8 @@ wayland_output_create_for_parent_output(struct wayland_backend *b,
 	return 0;
 
 out:
-	free(output->name);
+	free(output->base.name);
+	free(output->title);
 	free(output);
 
 	return -1;
@@ -1373,11 +1367,9 @@ out:
 static int
 wayland_output_create_fullscreen(struct wayland_backend *b)
 {
-	struct wayland_output *output = wayland_output_create_common();
+	struct wayland_output *output = wayland_output_create_common("wayland-fullscreen");
 	int width = 0, height = 0;
 
-	output->base.name = strdup("wayland-fullscreen");
-
 	weston_output_init(&output->base, b->compositor);
 
 	output->base.scale = 1;
@@ -1411,7 +1403,8 @@ wayland_output_create_fullscreen(struct wayland_backend *b)
 err_set_size:
 	wayland_backend_destroy_output_surface(output);
 err_surface:
-	free(output->name);
+	free(output->base.name);
+	free(output->title);
 	free(output);
 
 	return -1;