font: start working on core text cell height calcs

pkg/macos/text/font.zig

@@ -112,6 +112,22 @@ pub const Font = opaque {
         ));
     }
 
+    pub fn getAscent(self: *Font) f64 {
+        return c.CTFontGetAscent(@ptrCast(c.CTFontRef, self));
+    }
+
+    pub fn getDescent(self: *Font) f64 {
+        return c.CTFontGetDescent(@ptrCast(c.CTFontRef, self));
+    }
+
+    pub fn getLeading(self: *Font) f64 {
+        return c.CTFontGetLeading(@ptrCast(c.CTFontRef, self));
+    }
+
+    pub fn getBoundingBox(self: *Font) graphics.Rect {
+        return @bitCast(graphics.Rect, c.CTFontGetBoundingBox(@ptrCast(c.CTFontRef, self)));
+    }
+
     pub fn getUnderlinePosition(self: *Font) f64 {
         return c.CTFontGetUnderlinePosition(@ptrCast(c.CTFontRef, self));
     }

src/font/face/coretext.zig

@@ -118,7 +118,12 @@ pub const Face = struct {
             break :cell_width @floatCast(f32, max);
         };
 
-        std.log.warn("width={}", .{cell_width});
+        const cell_height: f32 = cell_height: {
+            const diff = ct_font.getAscent() + ct_font.getDescent() + ct_font.getLeading();
+            break :cell_height @floatCast(f32, diff);
+        };
+
+        std.log.warn("width={}, height={}", .{ cell_width, cell_height });
         return undefined;
     }
 };

src/font/face/freetype.zig

@@ -389,7 +389,7 @@ test {
 
     var ft_font = try Face.init(lib, testFont, .{ .points = 12 });
     defer ft_font.deinit();
-    //log.warn("FT WIDTH={}", .{ft_font.metrics.cell_width});
+    log.warn("FT={}", .{ft_font.metrics});
 
     try testing.expectEqual(Presentation.text, ft_font.presentation);