+#define MODE_READ "rb"
+#define MODE_WRITE "wb"
+#define MODE_APPEND "ab"
+
+#define DEFAULT_DEPTH 0
+
+#define BLIT_OPAQUE 0
+#define BLIT_MASKED 1
+#define BLIT_INVERSE 2
+#define BLIT_ON_BACKGROUND 3
+
+#define FULLSCREEN_NOT_AVAILABLE FALSE
+#define FULLSCREEN_AVAILABLE TRUE
+
+/* default input keys */
+#define DEFAULT_KEY_LEFT KSYM_Left
+#define DEFAULT_KEY_RIGHT KSYM_Right
+#define DEFAULT_KEY_UP KSYM_Up
+#define DEFAULT_KEY_DOWN KSYM_Down
+#if defined(PLATFORM_MACOSX)
+#define DEFAULT_KEY_SNAP KSYM_Control_L
+#define DEFAULT_KEY_DROP KSYM_KP_Enter
+#else
+#define DEFAULT_KEY_SNAP KSYM_Control_L
+#define DEFAULT_KEY_DROP KSYM_Control_R
+#endif
+#define DEFAULT_KEY_OKAY KSYM_Return
+#define DEFAULT_KEY_CANCEL KSYM_Escape
+
+/* default shortcut keys */
+#define DEFAULT_KEY_SAVE_GAME KSYM_F1
+#define DEFAULT_KEY_LOAD_GAME KSYM_F2
+#define DEFAULT_KEY_TOGGLE_PAUSE KSYM_space
+#define DEFAULT_KEY_FOCUS_PLAYER_1 KSYM_F5
+#define DEFAULT_KEY_FOCUS_PLAYER_2 KSYM_F6
+#define DEFAULT_KEY_FOCUS_PLAYER_3 KSYM_F7
+#define DEFAULT_KEY_FOCUS_PLAYER_4 KSYM_F8
+#define DEFAULT_KEY_FOCUS_PLAYER_ALL KSYM_F9
+
+/* values for key_status */
+#define KEY_NOT_PRESSED FALSE
+#define KEY_RELEASED FALSE
+#define KEY_PRESSED TRUE
+
+/* values for button status */
+#define MB_NOT_PRESSED FALSE
+#define MB_NOT_RELEASED TRUE
+#define MB_RELEASED FALSE
+#define MB_PRESSED TRUE
+#define MB_MENU_CHOICE FALSE
+#define MB_MENU_MARK TRUE
+#define MB_MENU_INITIALIZE (-1)
+#define MB_MENU_LEAVE (-2)
+#define MB_LEFTBUTTON 1
+#define MB_MIDDLEBUTTON 2
+#define MB_RIGHTBUTTON 3
+
+
+/* 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
+
+/* diagonal movement directions are used in a different contect than buttons */
+#define MV_BIT_UPLEFT 4
+#define MV_BIT_UPRIGHT 5
+#define MV_BIT_DOWNLEFT 6
+#define MV_BIT_DOWNRIGHT 7
+
+#define NUM_DIRECTIONS_FULL 8
+
+/* values for special "button" bitmasks */
+#define BUTTON_1 4
+#define BUTTON_2 5
+
+/* values for special "focus player" bitmasks */
+#define BIT_SET_FOCUS 6
+
+/* values for move directions and special "button" key bitmasks */
+#define MV_NONE 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 MV_UPLEFT (MV_UP | MV_LEFT)
+#define MV_UPRIGHT (MV_UP | MV_RIGHT)
+#define MV_DOWNLEFT (MV_DOWN | MV_LEFT)
+#define MV_DOWNRIGHT (MV_DOWN | MV_RIGHT)
+
+#define MV_HORIZONTAL (MV_LEFT | MV_RIGHT)
+#define MV_VERTICAL (MV_UP | MV_DOWN)
+#define MV_ALL_DIRECTIONS (MV_LEFT | MV_RIGHT | MV_UP | MV_DOWN)
+#define MV_ANY_DIRECTION (MV_ALL_DIRECTIONS)
+#define MV_NO_DIRECTION (MV_NONE)
+
+#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 SET_FOCUS (1 << BIT_SET_FOCUS)
+
+#define MV_DIR_FROM_BIT(x) ((x) < NUM_DIRECTIONS ? 1 << (x) : \
+ (x) == MV_BIT_UPLEFT ? MV_UPLEFT : \
+ (x) == MV_BIT_UPRIGHT ? MV_UPRIGHT : \
+ (x) == MV_BIT_DOWNLEFT ? MV_DOWNLEFT : \
+ (x) == MV_BIT_DOWNRIGHT ? MV_DOWNRIGHT : \
+ MV_NONE)
+
+#define MV_DIR_TO_BIT(x) ((x) == MV_LEFT ? MV_BIT_LEFT : \
+ (x) == MV_RIGHT ? MV_BIT_RIGHT : \
+ (x) == MV_UP ? MV_BIT_UP : \
+ (x) == MV_DOWN ? MV_BIT_DOWN : \
+ (x) == MV_UPLEFT ? MV_BIT_UPLEFT : \
+ (x) == MV_UPRIGHT ? MV_BIT_UPRIGHT : \
+ (x) == MV_DOWNLEFT ? MV_BIT_DOWNLEFT : \
+ (x) == MV_DOWNRIGHT ? MV_BIT_DOWNRIGHT : \
+ MV_BIT_DOWN)
+
+#define MV_DIR_OPPOSITE(x) ((x) == MV_LEFT ? MV_RIGHT : \
+ (x) == MV_RIGHT ? MV_LEFT : \
+ (x) == MV_UP ? MV_DOWN : \
+ (x) == MV_DOWN ? MV_UP : \
+ (x) == MV_UPLEFT ? MV_DOWNRIGHT : \
+ (x) == MV_UPRIGHT ? MV_DOWNLEFT : \
+ (x) == MV_DOWNLEFT ? MV_UPRIGHT : \
+ (x) == MV_DOWNRIGHT ? MV_UPLEFT : \
+ MV_NONE)
+
+/* 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_CE_VALUE (1 << 5)
+#define ANIM_CE_SCORE (1 << 6)
+#define ANIM_REVERSE (1 << 7)
+#define ANIM_OPAQUE_PLAYER (1 << 8)
+
+/* values for special (non game element) animation modes */
+#define ANIM_HORIZONTAL (1 << 9)
+#define ANIM_VERTICAL (1 << 10)
+#define ANIM_STATIC_PANEL (1 << 11)
+
+#define ANIM_DEFAULT ANIM_LOOP