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_tmp = (val); \
        typeof(max) gp_max_tmp = (max); \
        typeof(min) gp_min_tmp = (min); \
        gp_val_tmp = gp_val_tmp < gp_min_tmp ? gp_min_tmp : gp_val_tmp; \
        gp_val_tmp = gp_val_tmp > gp_max_tmp ? gp_max_tmp : gp_val_tmp; \
        gp_val_tmp; \
})
 
#define GP_CLAMP_INT_0_255(val) ({ \
        typeof(val) gp_val_tmp = (val); \
        typeof(val) gp_mask_tmp = ~0xff; \
        (gp_val_tmp & gp_mask_tmp) ? (gp_val_tmp < 0 ? 0 : 255) : gp_val_tmp; \
})
 
#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_tmp = (val); \
        typeof(val) gp_max_tmp = (max); \
        gp_val_tmp > gp_max_tmp ? gp_max_tmp : gp_val_tmp; \
})
 
#define GP_SAT_ADD(val, add, max) ({ \
        typeof(val) gp_val_tmp = (val); \
        typeof(add) gp_add_tmp = (add); \
        typeof(val) gp_max_tmp = (max); \
        typeof(val) gp_ret_tmp; \
        typeof(val) gp_add_neg_tmp = -gp_add_tmp; \
        if (gp_add_tmp > 0) \
                gp_ret_tmp =  gp_val_tmp + gp_add_tmp > gp_max_tmp ? gp_max_tmp : gp_val_tmp + gp_add_tmp; \
        else \
                gp_ret_tmp =  gp_val_tmp < gp_add_neg_tmp ? 0 : gp_val_tmp + gp_add_tmp; \
        gp_ret_tmp; \
})
 
#endif /* CORE_GP_CLAMP_H */