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, 7 insertions, 7 deletions

diff --git a/src/platform/posix/yasl_platform_sync.h b/src/platform/posix/yasl_platform_sync.h
index f94a25d..972eef2 100644
--- a/src/platform/posix/yasl_platform_sync.h
+++ b/src/platform/posix/yasl_platform_sync.h
@@ -1,26 +1,26 @@
-#ifndef YASL_POSIX_SYNC_H
-#define YASL_POSIX_SYNC_H
+#ifndef YASL_PRIVATE_POSIX_SYNC_H
+#define YASL_PRIVATE_POSIX_SYNC_H
 
 #include <pthread.h>
 
-typedef pthread_mutex_t yasl_mutex;
+typedef pthread_mutex_t yasl_private_mutex;
 
-static inline int yasl_mutex_init(yasl_mutex *mutex)
+static inline int yasl_private_mutex_init(yasl_private_mutex *mutex)
 {
     return pthread_mutex_init(mutex, NULL);
 }
 
-static inline void yasl_mutex_destroy(yasl_mutex *mutex)
+static inline void yasl_private_mutex_destroy(yasl_private_mutex *mutex)
 {
     pthread_mutex_destroy(mutex);
 }
 
-static inline void yasl_mutex_lock(yasl_mutex *mutex)
+static inline void yasl_private_mutex_lock(yasl_private_mutex *mutex)
 {
     pthread_mutex_lock(mutex);
 }
 
-static inline void yasl_mutex_unlock(yasl_mutex *mutex)
+static inline void yasl_private_mutex_unlock(yasl_private_mutex *mutex)
 {
     pthread_mutex_unlock(mutex);
 }