| /* |
| * 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 */ |
