Unify core and runner events into struct yasl_event

The core input queue and the yasl_run() runner each had their own event
type, and the runner translated one into the other. Both now share
struct yasl_event in <yasl/yasl.h>: yasl_surface_poll_event() returns the
same events the app event callback receives, so the runner forwards them
unchanged.

Pointer input becomes POINTER_DOWN/UP/MOTION/SCROLL/LEAVE with a named
yasl_pointer_button and a motion delta computed in the input queue. TEXT,
PASTE and DROP share one text payload, scale changes fold into
WINDOW_RESIZE, and every event carries a monotonic time_ns.
yasl_surface_set_mouse_mode() is replaced by
yasl_surface_set_pointer_mode(); no backend implements relative mode yet.

The export check now only counts YASL_API declarations, so function
pointer fields returning enum yasl_app_result are not mistaken for
exports.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/src/common/backend.h b/src/common/backend.h
index 17d781e..f0fae03 100644
--- a/src/common/backend.h
+++ b/src/common/backend.h
@@ -28,6 +28,7 @@ struct yasl_surface {
     void *ud;
     uint64_t frame_generation;
     struct input_queue input;
+    enum yasl_pointer_mode pointer_mode;
     struct yasl_frame_clock clock;
     uint64_t frames_skipped;
     yasl_timer_id *timers;
@@ -70,7 +71,11 @@ struct yasl_backend_ops {
     void (*surface_set_title)(struct yasl_surface *s, const char *title);
     void (*surface_schedule_redraw)(struct yasl_surface *s);
     bool (*surface_present)(struct yasl_surface *s, const struct yasl_framebuffer *fb, const struct yasl_damage_list *damage);
-    bool (*surface_input_poll)(struct yasl_surface *s, struct yasl_input_event *ev);
+    /* Optional; NULL means the common input queue is drained. */
+    bool (*surface_poll_event)(struct yasl_surface *s, struct yasl_event *ev);
+    /* Optional; NULL means only YASL_POINTER_NORMAL is supported. Backends that
+     * implement RELATIVE push POINTER_MOTION with delta set and pos frozen. */
+    bool (*surface_set_pointer_mode)(struct yasl_surface *s, enum yasl_pointer_mode mode);
     struct yasl_geometry (*surface_geometry)(const struct yasl_surface *s);
     struct yasl_timing (*surface_timing)(const struct yasl_surface *s);
     uint64_t (*surface_frame_time_ns)(struct yasl_surface *s, uint64_t now);