[cg] Add text module

Author: cmyr

piet-coregraphics/src/lib.rs

@@ -1,5 +1,7 @@
 //! The CoreGraphics backend for the Piet 2D graphics abstraction.
 
+mod text;
+
 use std::borrow::Cow;
 use std::sync::Arc;
 
@@ -20,6 +22,8 @@ use piet::{
     StrokeStyle, Text, TextLayout, TextLayoutBuilder,
 };
 
+pub use crate::text::{CoreGraphicsText, CoreGraphicsFont, CoreGraphicsFontBuilder, CoreGraphicsTextLayout, CoreGraphicsTextLayoutBuilder};
+
 pub struct CoreGraphicsContext<'a> {
     // Cairo has this as Clone and with &self methods, but we do this to avoid
     // concurrency problems.

piet-coregraphics/src/text.rs

@@ -0,0 +1,12 @@
+//! Text related stuff for the coregraphics backend
+
+pub struct CoreGraphicsFont;
+
+pub struct CoreGraphicsFontBuilder;
+
+#[derive(Clone)]
+pub struct CoreGraphicsTextLayout;
+
+pub struct CoreGraphicsTextLayoutBuilder {}
+
+pub struct CoreGraphicsText;