From 5e5b2bd18de6f25c5c959f272cf2e9aacdc4c0f5 Mon Sep 17 00:00:00 2001
From: Hans-Werner Hilse <hwhilse@gmail.com>
Date: Tue, 11 Nov 2014 15:39:10 +0100
Subject: [PATCH] calculate proper refresh coordinates when using viewport

The viewport offset used by refresh() was not properly adapted when
the screen was rotated.
---
 frontend/device/screen.lua | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/frontend/device/screen.lua b/frontend/device/screen.lua
index 95f4ae264..3bce2bad4 100644
--- a/frontend/device/screen.lua
+++ b/frontend/device/screen.lua
@@ -80,9 +80,14 @@ end
 
 function Screen:refresh(refresh_type, waveform_mode, wait_for_marker, x, y, w, h)
     if self.viewport and x and y then
-        -- adapt to viewport
-        x = x + self.viewport.x
-        y = y + self.viewport.y
+        -- adapt to viewport, depending on rotation
+        if self.cur_rotation_mode == 0 or self.cur_rotation_mode == 2 then
+            x = x + self.viewport.x
+            y = y + self.viewport.y
+        else
+            x = x + self.viewport.y
+            y = y + self.viewport.x
+        end
     end
     self.fb:refresh(refresh_type, waveform_mode, wait_for_marker, x, y, w, h)
 end