Refactor seat operations to use an interface

This splits each seat operation (drag/move tiling/floating etc) into a
separate file and introduces a struct sway_seatop_impl to abstract the
operation.

The move_tiling_threshold operation has been merged into move_tiling.

The main logic for each operation is untouched aside from variable
renames.

The following previously-static functions have been made public:
* node_at_coords
* container_raise_floating
* render_rect
* premultiply_alpha
* scale_box

1 files changed, 8 insertions, 0 deletions

diff --git a/include/sway/output.h b/include/sway/output.h
index f7c5ceba..bdf9614d 100644
--- a/include/sway/output.h
+++ b/include/sway/output.h
@@ -146,4 +146,12 @@ enum sway_container_layout output_get_default_layout(
 
 void output_add_listeners(struct sway_output *output);
 
+void render_rect(struct wlr_output *wlr_output,
+                pixman_region32_t *output_damage, const struct wlr_box *_box,
+                float color[static 4]);
+
+void premultiply_alpha(float color[4], float opacity);
+
+void scale_box(struct wlr_box *box, float scale);
+
 #endif