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52 lines
1012 B
C
52 lines
1012 B
C
/*
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* gfx/misc.h - Helper functions for geometry and attributes
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*
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* Written 2016 by Werner Almesberger
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* Copyright 2016 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef GFX_MISC_H
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#define GFX_MISC_H
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#include <stdbool.h>
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static inline int mxr(int x, int y, const int m[6])
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{
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return x * m[1] + y * m[2];
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}
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static inline int myr(int x, int y, const int m[6])
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{
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return x * m[4] + y * m[5];
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}
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static inline int mx(int x, int y, const int m[6])
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{
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return m[0] + mxr(x, y, m);
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}
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static inline int my(int x, int y, const int m[6])
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{
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return m[3] + myr(x, y, m);
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}
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unsigned matrix_to_angle(const int m[6]);
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bool matrix_is_mirrored(const int m[6]);
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int angle_add(int a, int b);
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int rx(int x, int y, int rot);
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int ry(int x, int y, int rot);
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#endif /* !GFX_MISC_H */
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