Simplify the public event and CPU API

Applications now need far less ceremony: hello.c is a 20-line loop that
handles REFRESH, CLOSE and QUIT and draws into the surface's own pixels.

- Fold GEOMETRY, STATE and FOCUS into one WINDOW event carrying size,
  scale and state; unchanged values send nothing.
- Guarantee REFRESH once a window has a size and after every resize,
  never at size zero.
- Merge DROP_HOVER into DROP with over/leave/data actions and give drag
  and drop actions enums.
- Keep event strings valid until the next wait and drop
  yasl_event_release; empty or failed waits report NONE.
- Replace copy-in presentation with a lent pixel buffer:
  yasl_cpu_pixels and yasl_cpu_present.
- Remove yasl_poll_event, yasl_cpu_read_pixels, unused event fields and
  comments that restated names.
- Wayland: resize floating windows in request_size instead of reporting
  it unsupported, and stop marking new GPU surfaces as Vulkan so
  yasl_vulkan_create_surface no longer fails with NATIVE_WINDOW_IN_USE.

Also includes the in-progress public API refactor that was uncommitted
in the tree (removal of the app/loop layer, new surface, GL and Vulkan
entry points).

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

1 files changed, 6 insertions, 31 deletions

diff --git a/include/yasl/native/wayland.h b/include/yasl/native/wayland.h
index b11e3b8..1b8881e 100644
--- a/include/yasl/native/wayland.h
+++ b/include/yasl/native/wayland.h
@@ -1,40 +1,15 @@
-/**
- * @file
- * Typed borrowed Wayland handles; available when built with Wayland support.
- */
 #ifndef YASL_NATIVE_WAYLAND_H
 #define YASL_NATIVE_WAYLAND_H
-
 #include "yasl/yasl.h"
-
+struct wl_display;
+struct wl_surface;
 #ifdef __cplusplus
 extern "C" {
 #endif
-
-struct wl_display;
-struct wl_surface;
-
-/* Return borrowed Wayland handles (expire on display/surface destruction).
- * Return NULL if display/surface is not a Wayland object or NULL. */
-/**
- * Get the borrowed Wayland connection for an object of the matching backend.
- * @param d Live display, or NULL.
- * @return The handle, or zero/NULL for NULL or a different backend.
- * Expires on display destruction. Available only when this backend is built.
- * Never pass a pointer to a destroyed object.
- */
-YASL_API struct wl_display *yasl_wayland_display_get_wl_display(struct yasl_display *d);
-/**
- * Get the borrowed Wayland surface for an object of the matching backend.
- * @param s Live surface, or NULL.
- * @return The handle, or zero/NULL for NULL or a different backend.
- * Expires on surface destruction. Available only when this backend is built.
- * Never pass a pointer to a destroyed object.
- */
-YASL_API struct wl_surface *yasl_wayland_surface_get_wl_surface(struct yasl_surface *s);
-
+/** Borrowed handles; never dispatch or close native connections independently. */
+YASL_API struct wl_display *yasl_wayland_display(const yasl_surface *surface);
+YASL_API struct wl_surface *yasl_wayland_surface(const yasl_surface *surface);
 #ifdef __cplusplus
 }
 #endif
-
-#endif /* YASL_NATIVE_WAYLAND_H */
+#endif