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, 0 insertions, 56 deletions

diff --git a/include/yasl/timing.h b/include/yasl/timing.h
deleted file mode 100644
index 7e4af9e..0000000
--- a/include/yasl/timing.h
+++ /dev/null
@@ -1,56 +0,0 @@
-/**
- * @file
- * Timing provenance, refresh estimates, and buffer-resize statistics.
- * All timestamps are monotonic nanoseconds, not wall-clock dates.
- */
-#ifndef YASL_TIMING_H
-#define YASL_TIMING_H
-
-#include <stdint.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/** Cumulative backend buffer-resize measurements; unavailable counters are zero. */
-struct yasl_resize_stats {
-    /** Number of measured buffer resizes. */
-    uint64_t count;
-    /** Mean measured resize duration in microseconds. */
-    double avg_us;
-    /** Maximum measured resize duration in microseconds. */
-    double max_us;
-    /** Backend minor page-fault counter, if collected. */
-    long minflt;
-};
-
-/* Describes last_present_ns, not merely availability of an extension. */
-/** Provenance of last_present_ns; only PRESENTATION confirms compositor presentation. */
-enum yasl_timing_source {
-    YASL_TIMING_UNKNOWN = 0, /**< No timing sample yet. */
-    YASL_TIMING_SUBMISSION, /**< CPU submission time, not scanout confirmation. */
-    YASL_TIMING_FRAME_CALLBACK, /**< Compositor pacing callback, not scanout confirmation. */
-    YASL_TIMING_PRESENTATION, /**< Compositor-confirmed presentation. */
-};
-
-/** Snapshot of estimates and timing provenance. Zero timestamps mean no sample yet. */
-struct yasl_timing {
-    /** Estimated refresh interval in nanoseconds; zero if unavailable. */
-    double refresh_ns;
-    /** Last timestamp, whose meaning is specified by source. */
-    uint64_t last_present_ns;
-    /** Estimated next presentation time, or zero without a prior sample. */
-    uint64_t next_present_ns;
-    /** Backend skipped-frame counter; not comparable across backends. */
-    uint64_t frames_skipped;
-    /** Provenance of last_present_ns. */
-    enum yasl_timing_source source;
-    /** Cumulative backend resize statistics. */
-    struct yasl_resize_stats resize;
-};
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* YASL_TIMING_H */