Simplify the public API into one dense header

yasl.h now holds everything except Vulkan: 45 functions instead of 62,
and three installed headers instead of ten.

- One constructor: yasl_surface_create takes CPU, GL or NATIVE, with
  zero-initialized GL options meaning 3.2 core, RGBA8, D24S8.
- Events carry action, mods, x, y and text at the top level; pen
  positions are now logical like pointer positions.
- yasl_cpu_pixels/yasl_cpu_present draw into one persistent canvas,
  cutting three full-frame copies per frame.
- yasl_surface_get_info, yasl_surface_request, YASL_CURSOR_LOCKED,
  yasl_surface_set_text_input, yasl_surface_begin_move_resize and
  yasl_surface_get_native replace groups of narrower calls.
- Interactive calls drop the decorative trigger event argument.
- yasl_wait_event returns 0 only on timeout or yasl_wake, the refresh
  callback runs only in native modal loops, focus loss sends
  INPUT_RESET, and a lost event no longer fails every later wait.
- Unsupported operations and bad arguments report ENOTSUP and EINVAL
  instead of EIO; the keycodes header no longer needs C23.
- The shared library gets a versioned SONAME and version macros.

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

5 files changed, 6 insertions, 0 deletions

diff --git a/src/platform/cocoa/keymap.h b/src/platform/cocoa/keymap.h
index 792b10d..bfb9604 100644
--- a/src/platform/cocoa/keymap.h
+++ b/src/platform/cocoa/keymap.h
@@ -1,6 +1,7 @@
 #ifndef YASL_PRIVATE_COCOA_KEYMAP_H
 #define YASL_PRIVATE_COCOA_KEYMAP_H
 
+#include <stdint.h>
 #include "yasl/keycodes.h"
 
 enum yasl_key yasl_private_key_from_cocoa(uint32_t code);
diff --git a/src/platform/freedesktop/desktop.c b/src/platform/freedesktop/desktop.c
index f90701a..76a7956 100644
--- a/src/platform/freedesktop/desktop.c
+++ b/src/platform/freedesktop/desktop.c
@@ -136,6 +136,7 @@ size_t desktop_resource_dir(char *buf, size_t cap)
 {
     (void)buf;
     (void)cap;
+    errno = ENOTSUP; /* Linux applications have no bundle. */
     return 0;
 }
 
diff --git a/src/platform/wayland/keymap.h b/src/platform/wayland/keymap.h
index 26b6ed4..2cef68c 100644
--- a/src/platform/wayland/keymap.h
+++ b/src/platform/wayland/keymap.h
@@ -1,6 +1,7 @@
 #ifndef YASL_PRIVATE_WAYLAND_KEYMAP_H
 #define YASL_PRIVATE_WAYLAND_KEYMAP_H
 
+#include <stdint.h>
 #include "yasl/keycodes.h"
 
 enum yasl_key yasl_private_key_from_evdev(uint32_t code);
diff --git a/src/platform/wayland/surface.c b/src/platform/wayland/surface.c
index 635c905..2b72317 100644
--- a/src/platform/wayland/surface.c
+++ b/src/platform/wayland/surface.c
@@ -382,6 +382,8 @@ uint32_t wayland_display_caps(const struct wayland_display *c)
         caps |= YASL_PRIVATE_CAP_DRAG_CARRY;
     if (c->primary_selection_mgr)
         caps |= YASL_PRIVATE_CAP_PRIMARY_SELECTION;
+    if (c->relative_pointer_mgr && c->pointer_constraints)
+        caps |= YASL_PRIVATE_CAP_RELATIVE_POINTER;
     return caps;
 }
 
diff --git a/src/platform/x11/keymap.h b/src/platform/x11/keymap.h
index 9bb009d..daf4ce4 100644
--- a/src/platform/x11/keymap.h
+++ b/src/platform/x11/keymap.h
@@ -1,6 +1,7 @@
 #ifndef YASL_PRIVATE_X11_KEYMAP_H
 #define YASL_PRIVATE_X11_KEYMAP_H
 
+#include <stdint.h>
 #include "yasl/keycodes.h"
 
 enum yasl_key yasl_private_key_from_xkb_name(const char name[4]);