tron@3636: /* $Id$ */
tron@3636: 
KUDr@6307: /** @file slope.h */
KUDr@6307: 
tron@3636: #ifndef SLOPE_H
tron@3636: #define SLOPE_H
tron@3636: 
bjarni@6298: enum Slope {
rubidium@4344: 	SLOPE_FLAT     = 0x00,
rubidium@4344: 	SLOPE_W        = 0x01,
rubidium@4344: 	SLOPE_S        = 0x02,
rubidium@4344: 	SLOPE_E        = 0x04,
rubidium@4344: 	SLOPE_N        = 0x08,
rubidium@4344: 	SLOPE_STEEP    = 0x10,
rubidium@4344: 	SLOPE_NW       = SLOPE_N | SLOPE_W,
rubidium@4344: 	SLOPE_SW       = SLOPE_S | SLOPE_W,
rubidium@4344: 	SLOPE_SE       = SLOPE_S | SLOPE_E,
rubidium@4344: 	SLOPE_NE       = SLOPE_N | SLOPE_E,
rubidium@4344: 	SLOPE_EW       = SLOPE_E | SLOPE_W,
rubidium@4344: 	SLOPE_NS       = SLOPE_N | SLOPE_S,
tron@3636: 	SLOPE_ELEVATED = SLOPE_N | SLOPE_E | SLOPE_S | SLOPE_W,
rubidium@4344: 	SLOPE_NWS      = SLOPE_N | SLOPE_W | SLOPE_S,
rubidium@4344: 	SLOPE_WSE      = SLOPE_W | SLOPE_S | SLOPE_E,
rubidium@4344: 	SLOPE_SEN      = SLOPE_S | SLOPE_E | SLOPE_N,
rubidium@4344: 	SLOPE_ENW      = SLOPE_E | SLOPE_N | SLOPE_W,
rubidium@4344: 	SLOPE_STEEP_W  = SLOPE_STEEP | SLOPE_NWS,
rubidium@4344: 	SLOPE_STEEP_S  = SLOPE_STEEP | SLOPE_WSE,
rubidium@4344: 	SLOPE_STEEP_E  = SLOPE_STEEP | SLOPE_SEN,
rubidium@4344: 	SLOPE_STEEP_N  = SLOPE_STEEP | SLOPE_ENW
bjarni@6298: };
tron@3636: 
tron@3636: static inline bool IsSteepSlope(Slope s)
tron@3636: {
tron@3636: 	return (s & SLOPE_STEEP) != 0;
tron@3636: }
tron@3636: 
tron@3636: static inline Slope ComplementSlope(Slope s)
tron@3636: {
tron@3636: 	assert(!IsSteepSlope(s));
tron@3636: 	return (Slope)(0xF ^ s);
tron@3636: }
tron@3636: 
peter1138@4666: #endif /* SLOPE_H */