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, 1 insertions, 1 deletions

diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 79ad7faa..04c9b4f6 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -300,7 +300,7 @@ static int scale_length(int length, int offset, float scale) {
         return round((offset + length) * scale) - round(offset * scale);
 }
 
-static void scale_box(struct wlr_box *box, float scale) {
+void scale_box(struct wlr_box *box, float scale) {
         box->width = scale_length(box->width, box->x, scale);
         box->height = scale_length(box->height, box->y, scale);
         box->x = round(box->x * scale);