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/*
* Support for Intel Camera Imaging ISP subsystem.
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef __SH_CSS_FRAC_H
#define __SH_CSS_FRAC_H
#include <math_support.h>
#define sISP_REG_BIT ISP_VEC_ELEMBITS
#define uISP_REG_BIT ((unsigned)(sISP_REG_BIT-1))
#define sSHIFT (16-sISP_REG_BIT)
#define uSHIFT ((unsigned)(16-uISP_REG_BIT))
#define sFRACTION_BITS_FITTING(a) (a-sSHIFT)
#define uFRACTION_BITS_FITTING(a) ((unsigned)(a-uSHIFT))
#define sISP_VAL_MIN (-(1<<uISP_REG_BIT))
#define sISP_VAL_MAX ((1<<uISP_REG_BIT)-1)
#define uISP_VAL_MIN ((unsigned)0)
#define uISP_VAL_MAX ((unsigned)((1<<uISP_REG_BIT)-1))
/* a:fraction bits for 16bit precision, b:fraction bits for ISP precision */
#define sDIGIT_FITTING(v, a, b) \
min(max((((v)>>sSHIFT) >> max(sFRACTION_BITS_FITTING(a)-(b), 0)), \
sISP_VAL_MIN), sISP_VAL_MAX)
#define uDIGIT_FITTING(v, a, b) \
min((unsigned)max((unsigned)(((v)>>uSHIFT) \
>> max((int)(uFRACTION_BITS_FITTING(a)-(b)), 0)), \
uISP_VAL_MIN), uISP_VAL_MAX)
#endif /* __SH_CSS_FRAC_H */
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