-#define GRID_REAL_WIDTH MAX(video.screen_width, \
- video.screen_height)
-#define GRID_REAL_HEIGHT MIN(video.screen_width, \
- video.screen_height)
+#define GRID_REAL_WIDTH MAX(1, MAX(video.screen_width, \
+ video.screen_height))
+#define GRID_REAL_HEIGHT MAX(1, MIN(video.screen_width, \
+ video.screen_height))