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/common/loop.h b/src/common/loop.h
index 60c5b64..3a1c542 100644
--- a/src/common/loop.h
+++ b/src/common/loop.h
@@ -1,15 +1,15 @@
-#ifndef YASL_COMMON_LOOP_H
-#define YASL_COMMON_LOOP_H
+#ifndef YASL_PRIVATE_COMMON_LOOP_H
+#define YASL_PRIVATE_COMMON_LOOP_H
 
-#include "yasl/loop.h"
+#include "common/private_loop.h"
 
 struct pollfd;
 
-int yasl_loop_next_timeout_ms(const struct yasl_loop *l);
+int yasl_private_loop_next_timeout_ms(const struct yasl_private_loop *l);
 /* The loop's current poll set, valid until the next watch change. Backends
  * that wait on native events use it to wake on loop readiness. */
-int yasl_loop_poll_set(const struct yasl_loop *l, const struct pollfd **fds);
+int yasl_private_loop_poll_set(const struct yasl_private_loop *l, const struct pollfd **fds);
 /* Whether id is armed: added, not deleted, and not retired by its callback. */
-bool yasl_loop_timer_armed(const struct yasl_loop *l, yasl_timer_id id);
+bool yasl_private_loop_timer_armed(const struct yasl_private_loop *l, yasl_private_timer_id id);
 
-#endif /* YASL_COMMON_LOOP_H */
+#endif /* YASL_PRIVATE_COMMON_LOOP_H */