Hoist `GlyphSize` out of nested scopes

src/font/face.zig

@@ -93,6 +93,14 @@ pub const Variation = struct {
     };
 };
 
+/// The size and position of a glyph.
+pub const GlyphSize = struct {
+    width: f64,
+    height: f64,
+    x: f64,
+    y: f64,
+};
+
 /// Additional options for rendering glyphs.
 pub const RenderOptions = struct {
     /// The metrics that are defining the grid layout. These are usually
@@ -214,14 +222,6 @@ pub const RenderOptions = struct {
             icon,
         };
 
-        /// The size and position of a glyph.
-        pub const GlyphSize = struct {
-            width: f64,
-            height: f64,
-            x: f64,
-            y: f64,
-        };
-
         /// Returns true if the constraint does anything. If it doesn't,
         /// because it neither sizes nor positions the glyph, then this
         /// returns false.

src/font/face/freetype.zig

@@ -386,7 +386,7 @@ pub const Face = struct {
     }
 
     /// Get a rect that represents the position and size of the loaded glyph.
-    fn getGlyphSize(glyph: freetype.c.FT_GlyphSlot) font.face.RenderOptions.Constraint.GlyphSize {
+    fn getGlyphSize(glyph: freetype.c.FT_GlyphSlot) font.face.GlyphSize {
         // If we're dealing with an outline glyph then we get the
         // outline's bounding box instead of using the built-in
         // metrics, since that's more precise and allows better