core: optimize struct layouts, eliminate branches, and fix event loop dispatch

- Fix Wayland event loop lockout by properly decoupling read arming and adding poll-backed dispatching
- Support standalone display lifecycle without requiring caller to manage a loop
- Eliminate alignment holes across yasl_surface, yasl_display, seat, touch_point, and conn_drag using pahole
- Replace branching state/button decoders with compile-time locked LUTs and branchless bitwise operations
- Accelerate UTF-8 validation with 64-bit word scanning for ASCII runs

1 files changed, 15 insertions, 14 deletions

diff --git a/src/wayland/shell.c b/src/wayland/shell.c
index ef72512..bc8083a 100644
--- a/src/wayland/shell.c
+++ b/src/wayland/shell.c
@@ -277,24 +277,25 @@ static void toplevel_configure(void *data, struct xdg_toplevel *toplevel,
     (void)toplevel;
     struct yasl_surface *w = data;
 
-    bool fs = false, max = false, act = false, susp = false, tiled = false;
+    uint32_t state_mask = 0;
     uint32_t *s;
     wl_array_for_each(s, states) {
-        switch (*s) {
-        case XDG_TOPLEVEL_STATE_FULLSCREEN:    fs   = true; break;
-        case XDG_TOPLEVEL_STATE_MAXIMIZED:     max  = true; break;
-        case XDG_TOPLEVEL_STATE_ACTIVATED:     act  = true; break;
-        case XDG_TOPLEVEL_STATE_SUSPENDED:     susp = true; break;
-        case XDG_TOPLEVEL_STATE_TILED_LEFT:
-        case XDG_TOPLEVEL_STATE_TILED_RIGHT:
-        case XDG_TOPLEVEL_STATE_TILED_TOP:
-        case XDG_TOPLEVEL_STATE_TILED_BOTTOM:  tiled = true; break;
-        default: break;
-        }
+        if (*s < 32)
+            state_mask |= (1u << *s);
     }
 
-    if (fs != w->fullscreen || max != w->maximized ||
-        act != w->activated || susp != w->suspended) {
+    bool max   = (state_mask & (1u << XDG_TOPLEVEL_STATE_MAXIMIZED)) != 0;
+    bool fs    = (state_mask & (1u << XDG_TOPLEVEL_STATE_FULLSCREEN)) != 0;
+    bool act   = (state_mask & (1u << XDG_TOPLEVEL_STATE_ACTIVATED)) != 0;
+    bool susp  = (state_mask & (1u << XDG_TOPLEVEL_STATE_SUSPENDED)) != 0;
+    bool tiled = (state_mask & (
+        (1u << XDG_TOPLEVEL_STATE_TILED_LEFT) |
+        (1u << XDG_TOPLEVEL_STATE_TILED_RIGHT) |
+        (1u << XDG_TOPLEVEL_STATE_TILED_TOP) |
+        (1u << XDG_TOPLEVEL_STATE_TILED_BOTTOM))) != 0;
+
+    if ((fs ^ w->fullscreen) | (max ^ w->maximized) |
+        (act ^ w->activated) | (susp ^ w->suspended)) {
         w->fullscreen = fs;
         w->maximized = max;
         w->activated = act;