/* Copyright (C) 2013-2023 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.
*/

#ifndef ets_h_INCLUDED
#  define ets_h_INCLUDED

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h> /* For FILE */
#include "stdpre.h" /* for gs_restrict */

#ifndef inline
#define inline __inline
#endif


/* Definitions for source pixel format.
 * Reasonable settings are as follows:
 * 8-bit: unsigned char ETS_SrcPixel; ETS_SRC_MAX = 255
 * 12-bit 0..4095: unsigned short (or int) ETS_SrcPixel; ETS_SRC_MAX = 4095
 * 12-bit 0..4096: unsigned short (or int) ETS_SrcPixel; ETS_SRC_MAX = 4096
 * 16-bit 0..65535: unsigned short (or int) ETS_SrcPixel; ETS_SRC_MAX = 65535
 * 16-bit 0..65536: unsigned int ETS_SrcPixel; ETS_SRC_MAX = 65536
 */

/* A quick and dirty switch for 8 or 16 bit data */
#define CHAR_SOURCE

#ifdef CHAR_SOURCE
    typedef unsigned char ETS_SrcPixel;
    #define ETS_SRC_MAX 255
#else
    typedef unsigned short ETS_SrcPixel;
    #define ETS_SRC_MAX 65535
#endif

/* Photoshop (and possibly other image formats define white in a CMYK image with a
   value of 255 (65535).  This is opposite of the PAM files that Robin has created.
   The ETS code expects white to be at 0.   Adjustments to the values in gray level
   will be baked into the LUT if needed */
typedef enum {
    ETS_BLACK_IS_ZERO = 0,
    ETS_BLACK_IS_ONE
} ETS_POLARITY;

/* To use the file dump capability:

   Open a file as with: fopen ("dumpfile", "wb");
   Put the resulting FILE * pointer in params->dump_file.
   Set params->dump_level to the desired level. ET_DUMP_ALL dumps all
   inputs and outputs. Other values will lead to much smaller files,
   but may not be as insightful.

   If no dump file is desired, set params->dump_file to NULL.
*/

typedef enum {
    ETS_DUMP_MINIMAL,
    ETS_DUMP_PARAMS,
    ETS_DUMP_LUTS,
    ETS_DUMP_INPUT,
    ETS_DUMP_ALL
} ETS_DumpLevel;

typedef enum {
    ETS_RSTYLE_NONE = 0,
    ETS_RSTYLE_THRESHOLD = 1,
    ETS_RSTYLE_PSEUDO = 2
} ETS_RStyle;

typedef enum {
    ETS_BIAS_ZERO = 0,
    ETS_BIAS_REDUCE_POSITIVE = 1,
    ETS_BIAS_NONE = 2,
    ETS_BIAS_REDUCE = 3,
    ETS_BIAS_DIVIDE_BY_N_LESS_3 = 4,
} ETS_Bias;

typedef struct {
    int width;
    int n_planes;
    int levels; /* Number of levels on output, <= 256 */
    int **luts;
    double distscale; /* 0 to autoselect based on aspect */
    int aspect_x;
    int aspect_y;
    int *strengths;
    int rand_scale; /* 0 is default. Larger means more random. */
    int *c1_scale; /* now an array, one per channel; 0 is default */
    ETS_Bias ets_bias;
    ETS_RStyle r_style;
    FILE *dump_file;
    ETS_DumpLevel dump_level;
    int **rand_scale_luts;
    ETS_POLARITY polarity;
} ETS_Params;

typedef struct _ETS_Ctx ETS_Ctx;

ETS_Ctx *
ets_create(void *malloc_arg, const ETS_Params *params);

void
ets_line(ETS_Ctx *ctx, unsigned char **dest, const ETS_SrcPixel * const * gs_restrict src);

void
ets_destroy(void *malloc_arg, ETS_Ctx *ctx);

/* These are called from ETS and must be implemented by the calling code. */
void *
ets_malloc(void *malloc_arg, int size);

void *
ets_calloc(void *malloc_arg, int count, int size);

void
ets_free(void *malloc_arg, void *p);

#ifdef __cplusplus
}
#endif

#endif