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63 { |
63 { |
64 return (DiagDirection)(2 ^ d); |
64 return (DiagDirection)(2 ^ d); |
65 } |
65 } |
66 |
66 |
67 |
67 |
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68 typedef enum DiagDirDiff { |
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69 DIAGDIRDIFF_SAME = 0, |
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70 DIAGDIRDIFF_90RIGHT = 1, |
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71 DIAGDIRDIFF_REVERSE = 2, |
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72 DIAGDIRDIFF_90LEFT = 3 |
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73 } DiagDirDiff; |
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74 |
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75 static inline DiagDirection ChangeDiagDir(DiagDirection d, DiagDirDiff delta) |
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76 { |
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77 return (DiagDirection)((d + delta) % 4); |
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78 } |
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79 |
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80 |
68 static inline DiagDirection DirToDiagDir(Direction dir) |
81 static inline DiagDirection DirToDiagDir(Direction dir) |
69 { |
82 { |
70 return (DiagDirection)(dir >> 1); |
83 return (DiagDirection)(dir >> 1); |
71 } |
84 } |
72 |
85 |