libweston: make wl_output point to weston_head

The user data of a wl_resource representing a wl_output protocol object
used to be a pointer to weston_output. Now that weston_output is being
split, wl_output more accurately refers to weston_head which is a single
monitor.

Change the wl_output user data to point to weston_head.
weston_output_from_resource() is replaced with
weston_head_from_resource().

This change is not strictly necessary, but architecturally it is the
right thing to do. In the future there might appear the need to refer to
a specific head of a cloned pair, for instance.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
v5 Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Ian Ray <ian.ray@ge.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>

compositor/weston-screenshooter.c

@@ -66,7 +66,7 @@ screenshooter_shoot(struct wl_client *client,
 		    struct wl_resource *buffer_resource)
 {
 	struct weston_output *output =
-		weston_output_from_resource(output_resource);
+		weston_head_from_resource(output_resource)->output;
 	struct weston_buffer *buffer =
 		weston_buffer_from_resource(buffer_resource);
 

desktop-shell/input-panel.c

@@ -270,11 +270,13 @@ input_panel_surface_set_toplevel(struct wl_client *client,
 	struct input_panel_surface *input_panel_surface =
 		wl_resource_get_user_data(resource);
 	struct desktop_shell *shell = input_panel_surface->shell;
+	struct weston_head *head;
 
 	wl_list_insert(&shell->input_panel.surfaces,
 		       &input_panel_surface->link);
 
-	input_panel_surface->output = weston_output_from_resource(output_resource);
+	head = weston_head_from_resource(output_resource);
+	input_panel_surface->output = head->output;
 	input_panel_surface->panel = 0;
 }
 

desktop-shell/shell.c

@@ -2969,7 +2969,7 @@ desktop_shell_set_background(struct wl_client *client,
 	surface->committed = background_committed;
 	surface->committed_private = shell;
 	weston_surface_set_label_func(surface, background_get_label);
-	surface->output = weston_output_from_resource(output_resource);
+	surface->output = weston_head_from_resource(output_resource)->output;
 	view->output = surface->output;
 
 	sh_output = find_shell_output_from_weston_output(shell, surface->output);
@@ -3066,7 +3066,7 @@ desktop_shell_set_panel(struct wl_client *client,
 	surface->committed = panel_committed;
 	surface->committed_private = shell;
 	weston_surface_set_label_func(surface, panel_get_label);
-	surface->output = weston_output_from_resource(output_resource);
+	surface->output = weston_head_from_resource(output_resource)->output;
 	view->output = surface->output;
 
 	sh_output = find_shell_output_from_weston_output(shell, surface->output);

fullscreen-shell/fullscreen-shell.c

@@ -769,7 +769,7 @@ fullscreen_shell_present_surface(struct wl_client *client,
 	}
 
 	if (output_res) {
-		output = weston_output_from_resource(output_res);
+		output = weston_head_from_resource(output_res)->output;
 		fsout = fs_output_for_output(output);
 		fs_output_set_surface(fsout, surface, method, 0, 0);
 	} else {
@@ -813,7 +813,7 @@ fullscreen_shell_present_surface_for_mode(struct wl_client *client,
 	struct weston_seat *seat;
 	struct fs_output *fsout;
 
-	output = weston_output_from_resource(output_res);
+	output = weston_head_from_resource(output_res)->output;
 	fsout = fs_output_for_output(output);
 
 	if (surface_res == NULL) {

ivi-shell/input-panel-ivi.c

@@ -271,11 +271,13 @@ input_panel_surface_set_toplevel(struct wl_client *client,
 	struct input_panel_surface *input_panel_surface =
 		wl_resource_get_user_data(resource);
 	struct ivi_shell *shell = input_panel_surface->shell;
+	struct weston_head *head;
 
 	wl_list_insert(&shell->input_panel.surfaces,
 		       &input_panel_surface->link);
 
-	input_panel_surface->output = weston_output_from_resource(output_resource);
+	head = weston_head_from_resource(output_resource);
+	input_panel_surface->output = head->output;
 	input_panel_surface->panel = 0;
 }
 

libweston-desktop/wl-shell.c

@@ -308,7 +308,7 @@ weston_desktop_wl_shell_surface_protocol_set_fullscreen(struct wl_client *wl_cli
 	struct weston_output *output = NULL;
 
 	if (output_resource != NULL)
-		output = weston_output_from_resource(output_resource);
+		output = weston_head_from_resource(output_resource)->output;
 
 	weston_desktop_wl_shell_change_state(surface, FULLSCREEN, NULL, 0, 0);
 	weston_desktop_api_fullscreen_requested(surface->desktop, dsurface,

libweston-desktop/xdg-shell-v6.c

@@ -515,7 +515,7 @@ weston_desktop_xdg_toplevel_protocol_set_fullscreen(struct wl_client *wl_client,
 	struct weston_output *output = NULL;
 
 	if (output_resource != NULL)
-		output = weston_output_from_resource(output_resource);
+		output = weston_head_from_resource(output_resource)->output;
 
 	weston_desktop_xdg_toplevel_ensure_added(toplevel);
 	weston_desktop_api_fullscreen_requested(toplevel->base.desktop, dsurface,

libweston/compositor.c

@@ -4330,7 +4330,7 @@ bind_output(struct wl_client *client,
 	}
 
 	wl_list_insert(&head->resource_list, wl_resource_get_link(resource));
-	wl_resource_set_implementation(resource, &output_interface, output,
+	wl_resource_set_implementation(resource, &output_interface, head,
 				       unbind_resource);
 
 	assert(output);
@@ -4364,8 +4364,8 @@ bind_output(struct wl_client *client,
  * \return The backing object (user data) of a wl_resource representing a
  * wl_output protocol object.
  */
-WL_EXPORT struct weston_output *
+WL_EXPORT struct weston_head *
-weston_output_from_resource(struct wl_resource *resource)
+weston_head_from_resource(struct wl_resource *resource)
 {
 	assert(wl_resource_instance_of(resource, &wl_output_interface,
 				       &output_interface));

libweston/compositor.h

@@ -1995,8 +1995,8 @@ weston_output_disable(struct weston_output *output);
 void
 weston_pending_output_coldplug(struct weston_compositor *compositor);
 
-struct weston_output *
+struct weston_head *
-weston_output_from_resource(struct wl_resource *resource);
+weston_head_from_resource(struct wl_resource *resource);
 
 #ifdef  __cplusplus
 }

tests/weston-test.c

@@ -530,7 +530,7 @@ capture_screenshot(struct wl_client *client,
 		   struct wl_resource *buffer_resource)
 {
 	struct weston_output *output =
-		weston_output_from_resource(output_resource);
+		weston_head_from_resource(output_resource)->output;
 	struct weston_buffer *buffer =
 		weston_buffer_from_resource(buffer_resource);