From df4bbaecec0b42e0e17c95c6b281fda174fccafa Mon Sep 17 00:00:00 2001
From: Michael Stahl <mstahl@redhat.com>
Date: Wed, 7 Mar 2018 12:32:59 +0100
Subject: [PATCH] sdext: document the secondary screen of Presenter Console

Change-Id: I539a698994b5fa20e3d371ae56d9aaf3001dba2b
---
 sdext/README | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sdext/README b/sdext/README
index a4f5cf654a11..63bfd6d0a793 100644
--- a/sdext/README
+++ b/sdext/README
@@ -23,3 +23,8 @@ source/presenter/ - Impress / Presenter Console.
     canvas (e.g. cairo canvas), while the entire secondary screen
     uses a VCL-canvas that is created in
     sd::framework::FullScreenPane::CreateCanvas().
+
+    The secondary screen contains 3 "Panes" which each have
+    2 XWindows for the border area & the actual content,
+    and each content Pane is backed by a sd::presenter::PresenterCanvas
+    that wraps the FullScreenPane's canvas and does clipping.