+
+/* values for move directions */
+#define MV_BIT_LEFT 0
+#define MV_BIT_RIGHT 1
+#define MV_BIT_UP 2
+#define MV_BIT_DOWN 3
+
+#define NUM_DIRECTIONS 4
+
+/* values for special "button" bitmasks */
+#define BUTTON_1 4
+#define BUTTON_2 5
+
+/* values for move direction and special "button" key bitmasks */
+#define MV_NO_MOVING 0
+#define MV_LEFT (1 << MV_BIT_LEFT)
+#define MV_RIGHT (1 << MV_BIT_RIGHT)
+#define MV_UP (1 << MV_BIT_UP)
+#define MV_DOWN (1 << MV_BIT_DOWN)
+
+#define KEY_BUTTON_1 (1 << BUTTON_1)
+#define KEY_BUTTON_2 (1 << BUTTON_2)
+#define KEY_MOTION (MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN)
+#define KEY_BUTTON (KEY_BUTTON_1 | KEY_BUTTON_2)
+#define KEY_ACTION (KEY_MOTION | KEY_BUTTON)
+
+#define MV_DIR_BIT(x) ((x) == MV_LEFT ? MV_BIT_LEFT : \
+ (x) == MV_RIGHT ? MV_BIT_RIGHT : \
+ (x) == MV_UP ? MV_BIT_UP : MV_BIT_DOWN)
+
+
+/* values for animation mode (frame order and direction) */
+#define ANIM_NONE 0
+#define ANIM_LOOP (1 << 0)
+#define ANIM_LINEAR (1 << 1)
+#define ANIM_PINGPONG (1 << 2)
+#define ANIM_PINGPONG2 (1 << 3)
+#define ANIM_RANDOM (1 << 4)
+#define ANIM_REVERSE (1 << 5)
+
+