core: optimize struct layouts, eliminate branches, and fix event loop dispatch

- Fix Wayland event loop lockout by properly decoupling read arming and adding poll-backed dispatching
- Support standalone display lifecycle without requiring caller to manage a loop
- Eliminate alignment holes across yasl_surface, yasl_display, seat, touch_point, and conn_drag using pahole
- Replace branching state/button decoders with compile-time locked LUTs and branchless bitwise operations
- Accelerate UTF-8 validation with 64-bit word scanning for ASCII runs

1 files changed, 2 insertions, 0 deletions

diff --git a/include/yasl/yasl.h b/include/yasl/yasl.h
index 0c2235a..081e1f0 100644
--- a/include/yasl/yasl.h
+++ b/include/yasl/yasl.h
@@ -269,6 +269,7 @@ YASL_API struct yasl_display *yasl_display_open(struct yasl_loop *loop,
 YASL_API void yasl_display_close(struct yasl_display *d);
 YASL_API uint32_t yasl_display_caps(const struct yasl_display *d);
 YASL_API void yasl_display_dispatch(struct yasl_display *d);
+YASL_API int yasl_display_dispatch_timeout(struct yasl_display *d, int timeout_ms);
 YASL_API void yasl_display_flush(struct yasl_display *d);
 YASL_API int yasl_display_modifiers(const struct yasl_display *d);
 YASL_API void yasl_display_copy(struct yasl_display *d, enum yasl_selection sel, const char *text);
@@ -343,6 +344,7 @@ YASL_API void *yasl_surface_get_native_handle(struct yasl_surface *s);
 YASL_API struct yasl_loop *yasl_loop_create(void);
 YASL_API void yasl_loop_destroy(struct yasl_loop *l);
 YASL_API int yasl_loop_run(struct yasl_loop *l);
+YASL_API int yasl_loop_step(struct yasl_loop *l, int timeout_ms);
 YASL_API void yasl_loop_quit(struct yasl_loop *l);
 YASL_API void yasl_loop_kick(struct yasl_loop *l);
 YASL_API uint64_t yasl_loop_now_ns(void);