gp_clamp.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * Copyright (C) 2009-2014 Cyril Hrubis <metan@ucw.cz>
 */
 
#ifndef CORE_GP_CLAMP_H
#define CORE_GP_CLAMP_H
 
#include <core/gp_compiler.h>
 
#define GP_CLAMP_GENERIC(val, min, max) ({ \
        typeof(val) gp_val__ = (val); \
        typeof(max) gp_max__ = (max); \
        typeof(min) gp_min__ = (min); \
        gp_val__ = gp_val__ < gp_min__ ? gp_min__ : gp_val__; \
        gp_val__ = gp_val__ > gp_max__ ? gp_max__ : gp_val__; \
        gp_val__; \
})
 
#define GP_CLAMP_INT_0_255(val) ({ \
        typeof(val) gp_val__ = (val); \
        typeof(val) _mask = ~0xff; \
        (gp_val__ & _mask) ? (gp_val__ < 0 ? 0 : 255) : gp_val__; \
})
 
#define GP_CLAMP(val, min, max) ({ \
        (GP_IS_CONSTANT(min) && GP_IS_CONSTANT(max) && \
         min == 0 && max == 255) ? \
         GP_CLAMP_INT_0_255(val) : \
         GP_CLAMP_GENERIC(val, min, max); \
})
 
#define GP_CLAMP_DOWN(val, max) ({ \
        typeof(val) gp_val__ = (val); \
        typeof(val) gp_max__ = (max); \
        gp_val__ > gp_max__ ? gp_max__ : gp_val__; \
})
 
#define GP_SAT_ADD(val, add, max) ({ \
        typeof(val) gp_val__ = (val); \
        typeof(add) gp_add__ = (add); \
        typeof(val) gp_max__ = (max); \
        typeof(val) gp_ret__; \
        typeof(val) gp_add_neg__ = -gp_add__; \
        if (gp_add__ > 0) \
                gp_ret__ =  gp_val__ + gp_add__ > gp_max__ ? gp_max__ : gp_val__ + gp_add__; \
        else \
                gp_ret__ =  gp_val__ < gp_add_neg__ ? 0 : gp_val__ + gp_add__; \
        gp_ret__; \
})
 
#endif /* CORE_GP_CLAMP_H */