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 261459adbd04ee65f594eeee4448b4c5ded80412..e4be416487fe8259ee05cf3dce921be901028c6b 100644 (file)
--- 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);