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, 6 deletions

diff --git a/src/common/utf8.h b/src/common/utf8.h
index f31c99d..5ffdb15 100644
--- a/src/common/utf8.h
+++ b/src/common/utf8.h
@@ -1,14 +1,14 @@
-#ifndef YASL_COMMON_UTF8_H
-#define YASL_COMMON_UTF8_H
+#ifndef YASL_PRIVATE_COMMON_UTF8_H
+#define YASL_PRIVATE_COMMON_UTF8_H
 
 #include <stdbool.h>
 #include <stddef.h>
 
-bool yasl_utf8_validate(const char *str, size_t len);
-char *yasl_utf8_sanitize_dup(const char *str);
+bool yasl_private_utf8_validate(const char *str, size_t len);
+char *yasl_private_utf8_sanitize_dup(const char *str);
 /* Owned conversions for X11 STRING interoperability. to_latin1 rejects text
  * outside Latin-1; byte lengths exclude the allocated NUL terminator. */
-char *yasl_utf8_from_latin1(const char *str, size_t len, size_t *out_len);
-char *yasl_utf8_to_latin1(const char *str, size_t *out_len);
+char *yasl_private_utf8_from_latin1(const char *str, size_t len, size_t *out_len);
+char *yasl_private_utf8_to_latin1(const char *str, size_t *out_len);
 
 #endif