font: deferred face can load core text backend

src/Window.zig

@@ -339,17 +339,20 @@ pub fn create(alloc: Allocator, loop: libuv.Loop, config: *const Config) !*Windo
             font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_bold_ttf, font_size)),
         );
 
-        // Emoji
+        // Emoji fallback. We don't include this on Mac since Mac is expected
-        try group.addFace(
+        // to always have the Apple Emoji available.
-            alloc,
+        if (builtin.os.tag != .macos or font.Discover == void) {
-            .regular,
+            try group.addFace(
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_ttf, font_size)),
+                alloc,
-        );
+                .regular,
-        try group.addFace(
+                font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_ttf, font_size)),
-            alloc,
+            );
-            .regular,
+            try group.addFace(
-            font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_text_ttf, font_size)),
+                alloc,
-        );
+                .regular,
+                font.DeferredFace.initLoaded(try font.Face.init(font_lib, face_emoji_text_ttf, font_size)),
+            );
+        }
 
         break :group group;
     });

src/font/DeferredFace.zig

@@ -115,6 +115,7 @@ pub fn load(
             // both here.
             switch (font.Face) {
                 @import("face/freetype.zig").Face => try self.loadCoreTextFreetype(lib, size),
+                @import("face/coretext.zig").Face => try self.loadCoreText(lib, size),
                 else => unreachable,
             }
 
@@ -142,6 +143,17 @@ fn loadFontconfig(
     self.face = try Face.initFile(lib, filename, face_index, size);
 }
 
+fn loadCoreText(
+    self: *DeferredFace,
+    lib: Library,
+    size: font.face.DesiredSize,
+) !void {
+    _ = lib;
+    assert(self.face == null);
+    const ct = self.ct.?;
+    self.face = try Face.initFontCopy(ct.font, size);
+}
+
 fn loadCoreTextFreetype(
     self: *DeferredFace,
     lib: Library,