/* 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.
*/


/* CIE color rendering dictionary creation */
#include "math_.h"
#include "memory_.h"
#include "string_.h"
#include "gx.h"
#include "gscdefs.h"		/* for gs_lib_device_list */
#include "gsdevice.h"
#include "gserrors.h"
#include "gsmatrix.h"		/* for gscolor2.h */
#include "gsparam.h"
#include "gsstruct.h"
#include "gsutil.h"
#include "gxcspace.h"
#include "gscolor2.h"		/* for gs_set/currentcolorrendering */
#include "gscrd.h"

/* Import gs_lib_device_list() */
extern_gs_lib_device_list();

/* Allocator structure type */
public_st_cie_render1();
static
ENUM_PTRS_WITH(cie_render1_enum_ptrs, gs_cie_render *pcrd) return 0;
case 0: return ENUM_OBJ(pcrd->client_data);
case 1: return ENUM_OBJ(pcrd->RenderTable.lookup.table);
case 2: return (pcrd->RenderTable.lookup.table ?
                ENUM_CONST_STRING(&pcrd->TransformPQR.proc_data) :
                0);
ENUM_PTRS_END
static RELOC_PTRS_WITH(cie_render1_reloc_ptrs, gs_cie_render *pcrd);
RELOC_OBJ_VAR(pcrd->client_data);
if (pcrd->RenderTable.lookup.table)
{
RELOC_OBJ_VAR(pcrd->RenderTable.lookup.table);
RELOC_CONST_STRING_VAR(pcrd->TransformPQR.proc_data);
}
RELOC_PTRS_END

/* Default CRD procedures. */

static int
tpqr_identity(int index, double in, const gs_cie_wbsd * pwbsd,
              gs_cie_render * pcrd, float *out)
{
    *out = in;
    return 0;
}

static int
tpqr_from_cache(int index, double in, const gs_cie_wbsd * pwbsd,
                gs_cie_render * pcrd, float *out)
{
    /*
     * Since the TransformPQR cache is in the joint caches, not in the
     * CRD cache, we can't actually implement this procedure.
     * Instead, the place that calls it checks for it specially.
     */
    *out = in;
    return 0;
}

static float
render_identity(double in, const gs_cie_render * pcrd)
{
    return in;
}
static frac
render_table_identity(byte in, const gs_cie_render * pcrd)
{
    return byte2frac(in);
}

/* Transformation procedures that just consult the cache. */

static float
EncodeABC_cached_A(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeABC[0].floats);
}
static float
EncodeABC_cached_B(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeABC[1].floats);
}
static float
EncodeABC_cached_C(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeABC[2].floats);
}
static float
EncodeLMN_cached_L(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeLMN.caches[0].floats);
}
static float
EncodeLMN_cached_M(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeLMN.caches[1].floats);
}
static float
EncodeLMN_cached_N(double in, const gs_cie_render * pcrd)
{
    return gs_cie_cached_value(in, &pcrd->caches.EncodeLMN.caches[2].floats);
}

static frac
RTT_cached(byte in, const gs_cie_render * pcrd, int i)
{
    return pcrd->caches.RenderTableT[i].fracs.values[
        in * (gx_cie_cache_size - 1) / 255
    ];
}
static frac
RTT_cached_0(byte in, const gs_cie_render * pcrd)
{
    return RTT_cached(in, pcrd, 0);
}
static frac
RTT_cached_1(byte in, const gs_cie_render * pcrd)
{
    return RTT_cached(in, pcrd, 1);
}
static frac
RTT_cached_2(byte in, const gs_cie_render * pcrd)
{
    return RTT_cached(in, pcrd, 2);
}
static frac
RTT_cached_3(byte in, const gs_cie_render * pcrd)
{
    return RTT_cached(in, pcrd, 3);
}

/* Define the TransformPQR trampoline procedure that looks up proc_name. */

static int
tpqr_do_lookup(gs_cie_render *pcrd, const gx_device *dev_proto)
{
    gx_device *dev;
    gs_memory_t *mem = pcrd->rc.memory;
    gs_c_param_list list;
    gs_param_string proc_addr;
    int code;

    /* Device prototypes are const, so we must create a copy. */
    code = gs_copydevice(&dev, dev_proto, mem);
    if (code < 0)
        return code;
    gs_c_param_list_write(&list, mem);
    code = param_request((gs_param_list *)&list,
                         pcrd->TransformPQR.proc_name);
    if (code >= 0) {
        code = gs_getdeviceparams(dev, (gs_param_list *)&list);
        if (code >= 0) {
            gs_c_param_list_read(&list);
            code = param_read_string((gs_param_list *)&list,
                                     pcrd->TransformPQR.proc_name,
                                     &proc_addr);
            if (code == 0 && proc_addr.size == sizeof(gs_cie_transform_proc)) {
                memcpy(&pcrd->TransformPQR.proc, proc_addr.data,
                       sizeof(gs_cie_transform_proc));
            } else
                code = gs_note_error(gs_error_rangecheck);
        }
    }
    gs_c_param_list_release(&list);
    gs_free_object(mem, dev, "tpqr_do_lookup(device)");
    return code;
}
static int
tpqr_lookup(int index, double in, const gs_cie_wbsd * pwbsd,
            gs_cie_render * pcrd, float *out)
{
    const gx_device *const *dev_list;
    int count = gs_lib_device_list(&dev_list, NULL);
    int i;
    int code;

    for (i = 0; i < count; ++i)
        if (!strcmp(gs_devicename(dev_list[i]),
                    pcrd->TransformPQR.driver_name))
            break;
    if (i < count)
        code = tpqr_do_lookup(pcrd, dev_list[i]);
    else
        code = gs_note_error(gs_error_undefined);
    if (code < 0)
        return code;
    return pcrd->TransformPQR.proc(index, in, pwbsd, pcrd, out);
}

/* Default vectors. */
const gs_cie_transform_proc3 TransformPQR_default = {
    tpqr_identity,
    0,				/* proc_name */
    {0, 0},			/* proc_data */
    0				/* driver_name */
};
const gs_cie_transform_proc3 TransformPQR_from_cache = {
    tpqr_from_cache,
    0,				/* proc_name */
    {0, 0},			/* proc_data */
    0				/* driver_name */
};
const gs_cie_transform_proc TransformPQR_lookup_proc_name = tpqr_lookup;
const gs_cie_render_proc3 Encode_default = {
    {render_identity, render_identity, render_identity}
};
const gs_cie_render_proc3 EncodeLMN_from_cache = {
    {EncodeLMN_cached_L, EncodeLMN_cached_M, EncodeLMN_cached_N}
};
const gs_cie_render_proc3 EncodeABC_from_cache = {
    {EncodeABC_cached_A, EncodeABC_cached_B, EncodeABC_cached_C}
};
const gs_cie_render_table_procs RenderTableT_default = {
    {render_table_identity, render_table_identity, render_table_identity,
     render_table_identity
    }
};
const gs_cie_render_table_procs RenderTableT_from_cache = {
    {RTT_cached_0, RTT_cached_1, RTT_cached_2, RTT_cached_3}
};

/*
 * Allocate and minimally initialize a CRD.  Note that this procedure sets
 * the reference count of the structure to 1, not 0.  gs_setcolorrendering
 * will increment the reference count again, so unless you want the
 * structure to stay allocated permanently (or until a garbage collection),
 * you should call rc_decrement(pcrd, "client name") *after* calling
 * gs_setcolorrendering.
 */
int
gs_cie_render1_build(gs_cie_render ** ppcrd, gs_memory_t * mem,
                     client_name_t cname)
{
    gs_cie_render *pcrd;

    rc_alloc_struct_1(pcrd, gs_cie_render, &st_cie_render1, mem,
                      return_error(gs_error_VMerror), cname);
    pcrd->id = gs_next_ids(mem, 1);
    /* Initialize pointers for the GC. */
    pcrd->client_data = 0;
    pcrd->RenderTable.lookup.table = 0;
    pcrd->status = CIE_RENDER_STATUS_BUILT;
    *ppcrd = pcrd;
    return 0;
}

static bool render_proc3_equal(const gs_cie_render_proc3 *p1, const gs_cie_render_proc3 *p2)
{
    int k;

    for (k = 0; k < 3; k++) {
        if (p1->procs[k] != p2->procs[k])
            return false;
    }
    return true;
}

static bool render_table_procs_equal(const gs_cie_render_table_procs *p1,
    const gs_cie_render_table_procs *p2)
{
    int k;

    for (k = 0; k < 4; k++) {
        if (p1->procs[k] != p2->procs[k])
            return false;
    }
    return true;
}

/*
 * Initialize a CRD given all of the relevant parameters.
 * Any of the pointers except WhitePoint may be zero, meaning
 * use the default values.
 *
 * The actual point, matrix, range, and procedure values are copied into the
 * CRD, but only the pointer to the color lookup table is copied.
 *
 * If pfrom_crd is not NULL, then if the EncodeLMN, EncodeABC, or
 * RenderTable.T procedures indicate that the values exist only in the
 * cache, the corresponding values will be copied from pfrom_crd.
 * Note that NULL values for the individual pointers still represent
 * default values.
 */
int
gs_cie_render1_init_from(const gs_memory_t *mem,
                         gs_cie_render * pcrd,
                         void *client_data,
                         const gs_cie_render * pfrom_crd,
                         const gs_vector3 * WhitePoint,
                         const gs_vector3 * BlackPoint,
                         const gs_matrix3 * MatrixPQR,
                         const gs_range3 * RangePQR,
                         const gs_cie_transform_proc3 * TransformPQR,
                         const gs_matrix3 * MatrixLMN,
                         const gs_cie_render_proc3 * EncodeLMN,
                         const gs_range3 * RangeLMN,
                         const gs_matrix3 * MatrixABC,
                         const gs_cie_render_proc3 * EncodeABC,
                         const gs_range3 * RangeABC,
                         const gs_cie_render_table_t * RenderTable)
{
    pcrd->id = gs_next_ids(mem, 1);
    pcrd->client_data = client_data;
    pcrd->points.WhitePoint = *WhitePoint;
    pcrd->points.BlackPoint =
        *(BlackPoint ? BlackPoint : &BlackPoint_default);
    pcrd->MatrixPQR = *(MatrixPQR ? MatrixPQR : &Matrix3_default);
    pcrd->RangePQR = *(RangePQR ? RangePQR : &Range3_default);
    pcrd->TransformPQR =
        *(TransformPQR ? TransformPQR : &TransformPQR_default);
    pcrd->MatrixLMN = *(MatrixLMN ? MatrixLMN : &Matrix3_default);
    pcrd->EncodeLMN = *(EncodeLMN ? EncodeLMN : &Encode_default);
    if (pfrom_crd && render_proc3_equal(&pcrd->EncodeLMN, &EncodeLMN_from_cache))
        memcpy(&pcrd->caches.EncodeLMN, &pfrom_crd->caches.EncodeLMN,
               sizeof(pcrd->caches.EncodeLMN));
    pcrd->RangeLMN = *(RangeLMN ? RangeLMN : &Range3_default);
    pcrd->MatrixABC = *(MatrixABC ? MatrixABC : &Matrix3_default);
    pcrd->EncodeABC = *(EncodeABC ? EncodeABC : &Encode_default);
    if (pfrom_crd && render_proc3_equal(&pcrd->EncodeABC, &EncodeABC_from_cache))
        memcpy(pcrd->caches.EncodeABC, pfrom_crd->caches.EncodeABC,
               sizeof(pcrd->caches.EncodeABC));
    pcrd->RangeABC = *(RangeABC ? RangeABC : &Range3_default);
    if (RenderTable) {
        pcrd->RenderTable = *RenderTable;
        if (pfrom_crd && render_table_procs_equal(&pcrd->RenderTable.T,
            &RenderTableT_from_cache)) {
            memcpy(pcrd->caches.RenderTableT, pfrom_crd->caches.RenderTableT,
                   sizeof(pcrd->caches.RenderTableT));
            pcrd->caches.RenderTableT_is_identity =
                pfrom_crd->caches.RenderTableT_is_identity;
        }
    } else {
        pcrd->RenderTable.lookup.table = 0;
        pcrd->RenderTable.T = RenderTableT_default;
    }
    pcrd->status = CIE_RENDER_STATUS_BUILT;
    return 0;
}
/*
 * Initialize a CRD without the option of copying cached values.
 */
int
gs_cie_render1_initialize(const gs_memory_t *mem,
                          gs_cie_render * pcrd, void *client_data,
                          const gs_vector3 * WhitePoint,
                          const gs_vector3 * BlackPoint,
                          const gs_matrix3 * MatrixPQR,
                          const gs_range3 * RangePQR,
                          const gs_cie_transform_proc3 * TransformPQR,
                          const gs_matrix3 * MatrixLMN,
                          const gs_cie_render_proc3 * EncodeLMN,
                          const gs_range3 * RangeLMN,
                          const gs_matrix3 * MatrixABC,
                          const gs_cie_render_proc3 * EncodeABC,
                          const gs_range3 * RangeABC,
                          const gs_cie_render_table_t * RenderTable)
{
    return gs_cie_render1_init_from(mem, pcrd, client_data, NULL,
                                    WhitePoint, BlackPoint,
                                    MatrixPQR, RangePQR, TransformPQR,
                                    MatrixLMN, EncodeLMN, RangeLMN,
                                    MatrixABC, EncodeABC, RangeABC,
                                    RenderTable);
}
