base/gstrap.c


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/* Copyright (C) 2001-2023 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  39 Mesa Street, Suite 108A, San Francisco,
   CA 94129, USA, for further information.
*/


/* Setting trapping parameters and zones */
#include "string_.h"
#include "gx.h"
#include "gserrors.h"
#include "gstrap.h"
#include "gsparamx.h"

/* Put a float parameter. */
static bool
check_unit(float *pval)
{
    return (*pval >= 0 && *pval <= 1);
}
static bool
check_positive(float *pval)
{
    return (*pval > 0);
}
static int
trap_put_float_param(gs_param_list * plist, gs_param_name param_name,
                     float *pval, bool(*check) (float *pval), int ecode)
{
    int code;

    switch (code = param_read_float(plist, param_name, pval)) {
        case 0:
            if ((*check) (pval))
                return 0;
            code = gs_error_rangecheck;
        default:
            ecode = code;
            param_signal_error(plist, param_name, ecode);
            break;
        case 1:
            break;
    }
    return ecode;
}

/* settrapparams */
int
gs_settrapparams(gs_trap_params_t * pparams, gs_param_list * plist)
{
    gs_trap_params_t params;
    int ecode = 0;
    static const char *const trap_placement_names[] = {
        gs_trap_placement_names, 0
    };

    params = *pparams;
    ecode = trap_put_float_param(plist, "BlackColorLimit",
                                 &params.BlackColorLimit, check_unit, ecode);
    ecode = trap_put_float_param(plist, "BlackDensityLimit",
                                 &params.BlackDensityLimit,
                                 check_positive, ecode);
    ecode = trap_put_float_param(plist, "BlackWidth",
                                 &params.BlackWidth, check_positive, ecode);
    ecode = param_put_bool(plist, "Enabled",
                           &params.Enabled, ecode);
    ecode = param_put_bool(plist, "ImageInternalTrapping",
                           &params.ImageInternalTrapping, ecode);
    ecode = param_put_bool(plist, "ImagemaskTrapping",
                           &params.ImagemaskTrapping, ecode);
    ecode = param_put_int(plist, "ImageResolution",
                          &params.ImageResolution, ecode);
    if (params.ImageResolution <= 0)
        param_signal_error(plist, "ImageResolution",
                           ecode = gs_error_rangecheck);
    ecode = param_put_bool(plist, "ImageToObjectTrapping",
                           &params.ImageToObjectTrapping, ecode);
    {
        int placement = params.ImageTrapPlacement;

        ecode = param_put_enum(plist, "ImageTrapPlacement",
                               &placement, trap_placement_names, ecode);
        params.ImageTrapPlacement = placement;
    }
    ecode = trap_put_float_param(plist, "SlidingTrapLimit",
                                 &params.SlidingTrapLimit, check_unit, ecode);
    ecode = trap_put_float_param(plist, "StepLimit",
                                 &params.StepLimit, check_unit, ecode);
    ecode = trap_put_float_param(plist, "TrapColorScaling",
                                 &params.TrapColorScaling, check_unit, ecode);
    ecode = trap_put_float_param(plist, "TrapWidth",
                                 &params.TrapWidth, check_positive, ecode);
    if (ecode < 0)
        return ecode;
    *pparams = params;
    return 0;
}