From 2a1cbb4f21f133764cbeefef7b4e521717ca71b9 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Sat, 4 Mar 2023 11:29:40 -0800
Subject: [PATCH] coretext: calculate units per em/point

---
 pkg/macos/text/font.zig    | 8 ++++++++
 src/font/face/coretext.zig | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/pkg/macos/text/font.zig b/pkg/macos/text/font.zig
index 6db9fa5c9..5ff031183 100644
--- a/pkg/macos/text/font.zig
+++ b/pkg/macos/text/font.zig
@@ -130,6 +130,14 @@ pub const Font = opaque {
     pub fn getUnderlineThickness(self: *Font) f64 {
         return c.CTFontGetUnderlineThickness(@ptrCast(self));
     }
+
+    pub fn getUnitsPerEm(self: *Font) u32 {
+        return c.CTFontGetUnitsPerEm(@ptrCast(c.CTFontRef, self));
+    }
+
+    pub fn getSize(self: *Font) f64 {
+        return c.CTFontGetSize(@ptrCast(c.CTFontRef, self));
+    }
 };
 
 pub const FontOrientation = enum(c_uint) {
diff --git a/src/font/face/coretext.zig b/src/font/face/coretext.zig
index a95fcb70a..c551e3bd3 100644
--- a/src/font/face/coretext.zig
+++ b/src/font/face/coretext.zig
@@ -317,6 +317,10 @@ pub const Face = struct {
         const strikethrough_position = cell_baseline * 0.6;
         const strikethrough_thickness = underline_thickness;
 
+        // Note: is this useful?
+        // const units_per_em = ct_font.getUnitsPerEm();
+        // const units_per_point = @intToFloat(f64, units_per_em) / ct_font.getSize();
+
         // std.log.warn("width={d}, height={d} baseline={d} underline_pos={d} underline_thickness={d}", .{
         //     cell_width,
         //     cell_height,