+// these bitmap pointers either point to allocated bitmaps or are NULL
+#define IMG_BITMAP_32x32 0
+#define IMG_BITMAP_16x16 1
+#define IMG_BITMAP_8x8 2
+#define IMG_BITMAP_4x4 3
+#define IMG_BITMAP_2x2 4
+#define IMG_BITMAP_1x1 5
+#define IMG_BITMAP_CUSTOM 6
+
+#define NUM_IMG_BITMAPS 7
+
+// this bitmap pointer points to one of the above bitmaps (do not free it)
+#define IMG_BITMAP_GAME 7
+
+#define NUM_IMG_BITMAP_POINTERS 8
+
+// this bitmap pointer points to the bitmap with default image size
+#define IMG_BITMAP_STANDARD IMG_BITMAP_32x32
+
+
+#define GET_BITMAP_ID_FROM_TILESIZE(x) ((x) == 1 ? IMG_BITMAP_1x1 : \
+ (x) == 2 ? IMG_BITMAP_2x2 : \
+ (x) == 4 ? IMG_BITMAP_4x4 : \
+ (x) == 8 ? IMG_BITMAP_8x8 : \
+ (x) == 16 ? IMG_BITMAP_16x16 : \
+ (x) == 32 ? IMG_BITMAP_32x32 : \
+ IMG_BITMAP_CUSTOM)
+
+#define GET_TILESIZE_FROM_BITMAP_ID(x) ((x) == IMG_BITMAP_1x1 ? 1 : \
+ (x) == IMG_BITMAP_2x2 ? 2 : \
+ (x) == IMG_BITMAP_4x4 ? 4 : \
+ (x) == IMG_BITMAP_8x8 ? 8 : \
+ (x) == IMG_BITMAP_16x16 ? 16 : \
+ (x) == IMG_BITMAP_32x32 ? 32 : \
+ 0)
+
+
+int getImageListSize(void);