--- a/src/gfx_type.h	Mon Jun 30 21:31:23 2008 +0000
+++ b/src/gfx_type.h	Wed Jul 09 13:32:13 2008 +0000
@@ -149,7 +149,7 @@
 	uint8 b, g, r, a; ///< colour channels in LE order
 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
 
-	operator uint32 () { return *(uint32 *)this; }
+	operator uint32 () const { return *(uint32 *)this; }
 };
 
 enum FontSize {
@@ -216,4 +216,11 @@
 	IS_PALETTE_COLOR = 0x100, ///< color value is already a real palette color index, not an index of a StringColor
 };
 
+/** Define the operation GfxFillRect performs */
+enum FillRectMode {
+	FILLRECT_OPAQUE,  ///< Fill rectangle with a single color
+	FILLRECT_CHECKER, ///< Draw only every second pixel, used for greying-out
+	FILLRECT_RECOLOR, ///< Apply a recolor sprite to the screen content
+};
+
 #endif /* GFX_TYPE_H */