Merge branch 'backend-selection' into main

- Implement runtime backend selection (Wayland, X11, Cocoa)
- Add native X11 backend with clipboard, keyboard, mouse, and placement
- Integrate multi-backend integration tests running under Weston and Xwayland
- Retain zero-hole struct packing, branchless ALU/LUT primitives, and paced event loop

1 files changed, 12 insertions, 11 deletions

diff --git a/src/wayland/popup.c b/src/wayland/popup.c
index e809a43..f0ef305 100644
--- a/src/wayland/popup.c
+++ b/src/wayland/popup.c
@@ -32,7 +32,7 @@ static bool popup_spec_valid(const struct yasl_popup_spec *spec)
            spec->content_offset.y + spec->content_size.y <= spec->size.y;
 }
 
-static bool popup_apply_spec(struct yasl_surface *w, const struct yasl_popup_spec *spec)
+static bool popup_apply_spec(struct wayland_surface *w, const struct yasl_popup_spec *spec)
 {
     uint32_t scale = w->parent->scale_120;
     struct yasl_vector2i logical = {
@@ -69,7 +69,7 @@ static bool popup_apply_spec(struct yasl_surface *w, const struct yasl_popup_spe
     return true;
 }
 
-static void popup_set_geometry(struct yasl_surface *w)
+static void popup_set_geometry(struct wayland_surface *w)
 {
     uint32_t scale = w->scale_120;
     int gx = yasl_scale_to_logical(w->content.x, scale);
@@ -85,10 +85,10 @@ static void popup_set_geometry(struct yasl_surface *w)
     xdg_surface_set_window_geometry(w->xdg_surface, gx, gy, gw, gh);
 }
 
-static struct xdg_positioner *popup_positioner(struct yasl_surface *w,
+static struct xdg_positioner *popup_positioner(struct wayland_surface *w,
         const struct yasl_popup_spec *spec)
 {
-    struct yasl_surface *parent = w->parent;
+    struct wayland_surface *parent = w->parent;
     struct xdg_positioner *pos = xdg_wm_base_create_positioner(w->conn->wm_base);
     if (!pos)
         return NULL;
@@ -119,23 +119,24 @@ static struct xdg_positioner *popup_positioner(struct yasl_surface *w,
     return pos;
 }
 
-struct yasl_surface *yasl_surface_create_popup(struct yasl_surface *parent,
+struct wayland_surface *wayland_surface_create_popup(struct wayland_surface *parent,
         const struct yasl_popup_spec *spec)
 {
-    struct yasl_display *c = parent ? parent->conn : NULL;
+    struct wayland_display *c = parent ? parent->conn : NULL;
     struct seat *seat = c ? conn_active_seat(c) : NULL;
     if (!c || c->lost || parent->closed || !parent->xdg_surface || !seat ||
         !seat->input_serial || !popup_spec_valid(spec))
         return NULL;
 
-    struct yasl_surface *w = calloc(1, sizeof(*w));
+    struct wayland_surface *w = calloc(1, sizeof(*w));
     if (!w)
         return NULL;
+    w->base.display = &c->base;
     w->conn = c;
     w->conn_next = c->surfaces;
     c->surfaces = w;
     w->parent = parent;
-    yasl_surface_set_callbacks(w, NULL, NULL);
+    wayland_surface_set_callbacks(w, NULL, NULL);
     w->clock.refresh_ns = parent->clock.refresh_ns;
 
     w->surface = wl_compositor_create_surface(c->compositor);
@@ -162,11 +163,11 @@ struct yasl_surface *yasl_surface_create_popup(struct yasl_surface *parent,
     return w;
 
 err:
-    yasl_surface_destroy(w);
+    wayland_surface_destroy(w);
     return NULL;
 }
 
-bool yasl_surface_popup_reposition(struct yasl_surface *w, const struct yasl_popup_spec *spec)
+bool wayland_surface_popup_reposition(struct wayland_surface *w, const struct yasl_popup_spec *spec)
 {
     if (!w || !w->popup || w->closed || !w->conn || w->conn->lost ||
         !popup_spec_valid(spec) ||
@@ -188,6 +189,6 @@ bool yasl_surface_popup_reposition(struct yasl_surface *w, const struct yasl_pop
     static uint32_t token;
     xdg_popup_reposition(w->popup, pos, ++token);
     xdg_positioner_destroy(pos);
-    yasl_surface_schedule_redraw(w);
+    wayland_surface_schedule_redraw(w);
     return true;
 }