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Justine Tunney 2020-06-15 07:18:57 -07:00
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dsp/core/gamma.h Normal file
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#ifndef COSMOPOLITAN_DSP_CORE_GAMMA_H_
#define COSMOPOLITAN_DSP_CORE_GAMMA_H_
#include "libc/math.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
#define COMPANDLUMA(X, ...) COMPANDLUMA_(X, __VA_ARGS__)
#define COMPANDLUMA_(X, K1, K2, K3, K4) \
((X) > (K3) / (K4) ? (1 + (K2)) * pow((X), 1 / (K1)) - (K2) : (X) * (K4))
#define UNCOMPANDLUMA(X, ...) UNCOMPANDLUMA_(X, __VA_ARGS__)
#define UNCOMPANDLUMA_(X, K1, K2, K3, K4) \
((X) > (K3) ? pow(1 / (1 + (K2)) * ((X) + (K2)), K1) : (X) / (K4))
#define COMPANDLUMA_SRGB_MAGNUM .055, .04045, 12.92
#define COMPANDLUMA_SRGB(X, G) COMPANDLUMA(X, G, COMPANDLUMA_SRGB_MAGNUM)
#define UNCOMPANDLUMA_SRGB(X, G) UNCOMPANDLUMA(X, G, COMPANDLUMA_SRGB_MAGNUM)
#define COMPANDLUMA_BT1886_MAGNUM 1 / .45, .099, .081, 4.5
#define COMPANDLUMA_BT1886(X) COMPANDLUMA(X, COMPANDLUMA_BT1886_MAGNUM)
#define UNCOMPANDLUMA_BT1886(X) UNCOMPANDLUMA(X, COMPANDLUMA_BT1886_MAGNUM)
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_DSP_CORE_GAMMA_H_ */