Index: alex4src/src/main.c
===================================================================
--- alex4src.orig/src/main.c	2011-06-07 11:43:11.000000000 +0200
+++ alex4src/src/main.c	2011-06-07 11:59:26.000000000 +0200
@@ -62,6 +62,7 @@
 DATAFILE *maps = NULL;
 DATAFILE *sfx_data = NULL;
 BITMAP *swap_screen;
+BITMAP *colorconv_screen = 0;
 PALETTE org_pal;
 Tscroller hscroll;
 Thisc *hisc_table;
@@ -484,9 +485,20 @@
 
 // blits anything to screen
 void blit_to_screen(BITMAP *bmp) {
+   if (!colorconv_screen || 
+       colorconv_screen->w != bmp->w || colorconv_screen->h != bmp->h)
+   {
+      if (colorconv_screen)
+	 destroy_bitmap(colorconv_screen);
+
+      colorconv_screen = create_bitmap_ex(bitmap_color_depth(screen), 
+					  bmp->w, bmp->h);
+   }
+   blit (bmp, colorconv_screen, 0, 0, 0, 0, bmp->w, bmp->h);
+
 	acquire_screen();
 	if (options.use_vsync) vsync();
-	stretch_blit(bmp, screen, 0, 0, bmp->w, bmp->h, 0, 0, SCREEN_W, SCREEN_H);
+	stretch_blit(colorconv_screen, screen, 0, 0, bmp->w, bmp->h, 0, 0, SCREEN_W, SCREEN_H);
 	release_screen();
 }
 
@@ -674,6 +686,7 @@
 
 	log2file(" entering gfx mode set in alex4.ini (%dx%d %s)", w, h, (get_config_int("graphics", "fullscreen", 0) ? "full" : "win"));
 
+	set_color_depth(32);
     if (set_gfx_mode(
 		(get_config_int("graphics", "fullscreen", 0) ? GFX_AUTODETECT_FULLSCREEN : GFX_AUTODETECT_WINDOWED),
 		w, h, 0, 0)) {
@@ -689,6 +702,7 @@
 			}
 		}
 	}
+    set_color_depth(8);
 
 	// show initial loading screen
 	clear(swap_screen);