From: Holger Schemel <info@artsoft.org>
Date: Tue, 17 Apr 2018 17:49:13 +0000 (+0200)
Subject: added check to prevent crash when drawing sprites for undefined graphics
X-Git-Tag: 4.1.1.0~197
X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=commitdiff_plain;h=c30edbbd22c95dc165311601b15d5370e134fbf8

added check to prevent crash when drawing sprites for undefined graphics

Due to a bug (that will be fixed with the following commit) it may
be possible that game elements are drawn for undefined graphics ID,
resulting in a crash.

A check was added to prevent drawing sprites for undefined graphics.
---

diff --git a/src/game_sp/DDSpriteBuffer.c b/src/game_sp/DDSpriteBuffer.c
index 261459ad..e4be4164 100644
--- a/src/game_sp/DDSpriteBuffer.c
+++ b/src/game_sp/DDSpriteBuffer.c
@@ -37,6 +37,9 @@ void DDSpriteBuffer_BltImg(int pX, int pY, int graphic, int sync_frame)
   if (NoDisplayFlag)
     return;
 
+  if (graphic < 0)
+    return;
+
   getGraphicSource_SP(&g, graphic, sync_frame, -1, -1);
 
   Blt(pX, pY, g.bitmap, g.src_x, g.src_y);