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, 42 insertions, 9 deletions

diff --git a/src/cocoa/window.m b/src/cocoa/window.m
index 0edf694..6c28f3f 100644
--- a/src/cocoa/window.m
+++ b/src/cocoa/window.m
@@ -843,29 +843,62 @@ static void pump_window(struct yasl_surface *w)
     @autoreleasepool { render_and_commit(w); }
 }
 
-void yasl_display_dispatch(struct yasl_display *d)
+int yasl_display_dispatch_timeout(struct yasl_display *d, int timeout_ms)
 {
     assert([NSThread isMainThread]);
     if (!d || d->pumping)
-        return;
+        return -1;
     d->pumping = true;
     d->depth++;
+    int count = 0;
     @try {
-        for (;;) {
-            @autoreleasepool {
-                NSEvent *ev = [NSApp nextEventMatchingMask:NSEventMaskAny
-                                                untilDate:[NSDate distantPast]
-                                                   inMode:NSDefaultRunLoopMode
-                                                  dequeue:YES];
-                if (!ev) break;
+        NSDate *limitDate;
+        if (timeout_ms == 0)
+            limitDate = [NSDate distantPast];
+        else if (timeout_ms < 0)
+            limitDate = [NSDate distantFuture];
+        else
+            limitDate = [NSDate dateWithTimeIntervalSinceNow:(double)timeout_ms / 1000.0];
+
+        @autoreleasepool {
+            NSEvent *ev = [NSApp nextEventMatchingMask:NSEventMaskAny
+                                            untilDate:limitDate
+                                               inMode:NSDefaultRunLoopMode
+                                              dequeue:YES];
+            if (ev) {
+                count++;
                 [NSApp sendEvent:ev];
                 [NSApp updateWindows];
+
+                while ((ev = [NSApp nextEventMatchingMask:NSEventMaskAny
+                                                untilDate:[NSDate distantPast]
+                                                   inMode:NSDefaultRunLoopMode
+                                                  dequeue:YES])) {
+                    count++;
+                    [NSApp sendEvent:ev];
+                    [NSApp updateWindows];
+                }
             }
         }
     } @finally {
         d->depth--;
         d->pumping = false;
     }
+    return count;
+}
+
+void yasl_display_dispatch(struct yasl_display *d)
+{
+    if (!d) return;
+    bool immediate = false;
+    for (int i = 0; i < d->count; i++) {
+        struct yasl_surface *w = d->windows[i];
+        if (w->input.count > 0 || (w->want_draw && (!w->link || w->frame_due || w->unpaced))) {
+            immediate = true;
+            break;
+        }
+    }
+    yasl_display_dispatch_timeout(d, immediate ? 0 : -1);
 }
 
 void yasl_display_flush(struct yasl_display *d)