X-Git-Url: https://git.ucc.asn.au/?p=ipdf%2Fcode.git;a=blobdiff_plain;f=src%2Fscreen.h;fp=src%2Fscreen.h;h=f5ae7533a14e21272140b32470d8b04e58fd324d;hp=c8acbcfc896606aa31311b2ca29d7318bb039c86;hb=4e0ddbcec6e182430a31e0f1c661f2c93c9e0308;hpb=d1f4d742e6634fda7c8a1e018b4f9c8ec0f4e51c

diff --git a/src/screen.h b/src/screen.h
index c8acbcf..f5ae753 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -24,8 +24,8 @@ namespace IPDF
 		void Present();
 
 		// Get the current width/height of the window's viewport.
-		int ViewportWidth() { return m_viewport_width; }
-		int ViewportHeight() { return m_viewport_height; }
+		int ViewportWidth() const { return m_viewport_width; }
+		int ViewportHeight() const { return m_viewport_height; }
 		
 		// Handle mouse input.
 		typedef std::function<void(int x, int y, int button, int wheel)> MouseHandler;