From cc72e6de237c79c85488907cbd1083b769a0a6bd Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 3 May 2024 20:45:46 -0700
Subject: [PATCH] pkg/macos: display link callback slightly more typesafe

---
 pkg/macos/video/display_link.zig | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkg/macos/video/display_link.zig b/pkg/macos/video/display_link.zig
index 0ccae691d..456d7f8d1 100644
--- a/pkg/macos/video/display_link.zig
+++ b/pkg/macos/video/display_link.zig
@@ -52,8 +52,9 @@ pub const DisplayLink = opaque {
     // pass this through.
     pub fn setOutputCallback(
         self: *DisplayLink,
-        comptime callbackFn: *const fn (*DisplayLink, ?*anyopaque) void,
-        userinfo: ?*anyopaque,
+        comptime Userdata: type,
+        comptime callbackFn: *const fn (*DisplayLink, ?*Userdata) void,
+        userinfo: ?*Userdata,
     ) Error!void {
         if (c.CVDisplayLinkSetOutputCallback(
             @ptrCast(self),
@@ -71,7 +72,10 @@ pub const DisplayLink = opaque {
                     _ = flagsIn;
                     _ = flagsOut;
 
-                    callbackFn(displayLink, inner_userinfo);
+                    callbackFn(
+                        displayLink,
+                        @alignCast(@ptrCast(inner_userinfo)),
+                    );
                     return c.kCVReturnSuccess;
                 }
             }).callback),