From: Holger Schemel <info@artsoft.org>
Date: Thu, 12 Jan 2017 23:48:52 +0000 (+0100)
Subject: fixed nasty bug that stopped animations when defining 'door_2' off-screen
X-Git-Tag: 4.0.0.2~38
X-Git-Url: https://git.artsoft.org/?a=commitdiff_plain;h=9eb4ba2e639c16c6a5e72ddaeabfb455a85c66bf;p=rocksndiamonds.git

fixed nasty bug that stopped animations when defining 'door_2' off-screen
---

diff --git a/src/tools.c b/src/tools.c
index b07e19d3..55a28fc4 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -759,6 +759,13 @@ void BackToFront()
       y2 = MAX(y2, EY + EYSIZE);
     }
 
+    // make sure that at least one pixel is blitted, and inside the screen
+    // (else nothing is blitted, causing the animations not to be updated)
+    x1 = MIN(MAX(0, x1), WIN_XSIZE - 1);
+    y1 = MIN(MAX(0, y1), WIN_YSIZE - 1);
+    x2 = MIN(MAX(1, x2), WIN_XSIZE);
+    y2 = MIN(MAX(1, y2), WIN_YSIZE);
+
     BlitBitmap(backbuffer, window, x1, y1, x2 - x1, y2 - y1, x1, y1);
   }