Implement relative pointer mode on Wayland

yasl_surface_set_pointer_mode(YASL_POINTER_RELATIVE) now takes a
persistent zwp_locked_pointer_v1 on the surface and hides its cursor.
While the compositor keeps the lock engaged, zwp_relative_pointer_v1
motion is pushed as POINTER_MOTION with pos frozen and delta in device
pixels. When the lock disengages, as on focus loss, motion is absolute
again with a delta derived by the input queue.

The lock follows the pointer's seat: it moves to another seat when its
seat loses the pointer, and is released on NORMAL and on surface
destruction. Compositors without both protocols return false.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/platform/wayland/api.h b/src/platform/wayland/api.h
index aabc182..e5e933e 100644
--- a/src/platform/wayland/api.h
+++ b/src/platform/wayland/api.h
@@ -29,6 +29,7 @@ bool wayland_surface_poll_event(struct wayland_surface *s, struct yasl_event *ev
 struct yasl_geometry wayland_surface_geometry(const struct wayland_surface *s);
 struct yasl_timing wayland_surface_timing(const struct wayland_surface *s);
 void wayland_surface_set_cursor(struct wayland_surface *s, enum yasl_cursor cursor);
+bool wayland_surface_set_pointer_mode(struct wayland_surface *s, enum yasl_pointer_mode mode);
 void wayland_surface_set_background_color(struct wayland_surface *s, uint32_t bg);
 bool wayland_surface_ime_preedit_cursor(const struct wayland_surface *s, int *begin, int *end);
 void wayland_surface_set_ime_caret(struct wayland_surface *s, struct yasl_rect2i caret);