scene: split output code in a separate file

wlr_scene.c is getting large. Let's split it in half.

include/types/wlr_scene.h

@@ -5,6 +5,28 @@
 
 struct wlr_scene *scene_node_get_root(struct wlr_scene_node *node);
 
+void scene_node_get_size(struct wlr_scene_node *node, int *width, int *height);
+
+void scene_node_opaque_region(struct wlr_scene_node *node, int x, int y, pixman_region32_t *opaque);
+
 void scene_surface_set_clip(struct wlr_scene_surface *surface, struct wlr_box *clip);
 
+void scale_region(pixman_region32_t *region, float scale, bool round_up);
+
+void output_to_buffer_coords(pixman_region32_t *damage, struct wlr_output *output);
+
+void scene_output_damage(struct wlr_scene_output *scene_output, const pixman_region32_t *damage);
+
+void scene_buffer_set_texture(struct wlr_scene_buffer *scene_buffer, struct wlr_texture *texture);
+
+void update_node_update_outputs(struct wlr_scene_node *node,
+	struct wl_list *outputs, struct wlr_scene_output *ignore,
+	struct wlr_scene_output *force);
+
+typedef bool (*scene_node_box_iterator_func_t)(struct wlr_scene_node *node,
+	int sx, int sy, void *data);
+
+bool scene_nodes_in_box(struct wlr_scene_node *node, struct wlr_box *box,
+	scene_node_box_iterator_func_t iterator, void *user_data);
+
 #endif

types/meson.build

@@ -14,6 +14,7 @@ wlr_files += files(
 	'scene/subsurface_tree.c',
 	'scene/surface.c',
 	'scene/wlr_scene.c',
+	'scene/output.c',
 	'scene/output_layout.c',
 	'scene/xdg_shell.c',
 	'scene/layer_shell_v1.c',