From 666af3ff3eba304d1f472206c729db1e36f5d9ea Mon Sep 17 00:00:00 2001
From: Wez Furlong <wez@wezfurlong.org>
Date: Sat, 14 Jul 2018 08:00:50 -0700
Subject: [PATCH] sketch out the interface for two future functions

---
 src/screen.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/screen.rs b/src/screen.rs
index c73af2fb4..970d671de 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -383,6 +383,19 @@ impl Screen {
 
         result
     }
+
+    /// Computes the change stream required to make `self` have the same
+    /// screen contents as `other`.
+    pub fn diff_screens(&self, _other: &Screen) -> Vec<Change> {
+        unimplemented!()
+    }
+
+    /// Draw the contents of `other` into self at the specified coordinates.
+    /// The required updates are recorded as Change entries as well as stored
+    /// in the screen line/cell data.
+    pub fn draw_from_screen(&mut self, _other: &Screen, _x: usize, _y: usize) {
+        unimplemented!()
+    }
 }
 
 /// Applies a Position update to either the x or y position.