/* Copyright (C) 2001-2012 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.,  7 Mt. Lassen Drive - Suite A-134, San Rafael,
   CA  94903, U.S.A., +1(415)492-9861, for further information.
*/


/* Level 2 color operators for Ghostscript library */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gxarith.h"
#include "gxfixed.h"            /* ditto */
#include "gxmatrix.h"           /* for gzstate.h */
#include "gxcspace.h"           /* for gscolor2.h */
#include "gxcolor2.h"
#include "gzstate.h"
#include "gxpcolor.h"
#include "stream.h"
#include "gxcie.h"
#include "gxfrac.h"

/* ---------------- General colors and color spaces ---------------- */
int
gs_setcolorspace_only(gs_gstate * pgs, gs_color_space * pcs)
{
    int             code = 0;
    gs_color_space  *cs_old = pgs->color[0].color_space;
    gs_client_color cc_old = *pgs->color[0].ccolor;

    if (pgs->in_cachedevice)
        return_error(gs_error_undefined);

    if (pcs->id != cs_old->id) {
        rc_increment_cs(pcs);
        pgs->color[0].color_space = pcs;
        if ( (code = pcs->type->install_cspace(pcs, pgs)) < 0          ||
              (pgs->overprint && (code = gs_do_set_overprint(pgs)) < 0)  ) {
            pgs->color[0].color_space = cs_old;
            rc_decrement_only_cs(pcs, "gs_setcolorspace");
        } else {
            cs_old->type->adjust_color_count(&cc_old, cs_old, -1);
            rc_decrement_only_cs(cs_old, "gs_setcolorspace");
        }
    }
    return(code);
}

/* setcolorspace */
int
gs_setcolorspace(gs_gstate * pgs, gs_color_space * pcs)
{
    int             code = 0;

    code = gs_setcolorspace_only(pgs, pcs);
    if (code >= 0) {
        pgs->color[0].color_space->pclient_color_space_data =
            pcs->pclient_color_space_data;
        cs_full_init_color(pgs->color[0].ccolor, pcs);
        gx_unset_dev_color(pgs);
    }
    return code;
}

/* currentcolorspace */
gs_color_space *
gs_currentcolorspace(const gs_gstate * pgs)
{
    return pgs->color[0].color_space;
}

/* setcolor */
int
gs_setcolor(gs_gstate * pgs, const gs_client_color * pcc)
{
    gs_color_space *    pcs = pgs->color[0].color_space;
    gs_client_color     cc_old = *pgs->color[0].ccolor;
    gx_device_color *dev_color = pgs->color[0].dev_color;
    bool do_unset  = true;

    if (pgs->in_cachedevice)
        return_error(gs_error_undefined); /* PLRM3 page 215. */
    if (dev_color->ccolor_valid && gx_dc_is_pure(dev_color)) {      /* change of colorspace will set type to _none */
        int i;
        int ncomps = cs_num_components(pcs);

        for(i=0; i < ncomps; i++)
            if (dev_color->ccolor.paint.values[i] != pcc->paint.values[i])
                break;
        do_unset = i < ncomps;      /* if i == ncomps, color unchanged, optimized */
    }
    if (do_unset)
        gx_unset_dev_color(pgs);
    (*pcs->type->adjust_color_count)(pcc, pcs, 1);
    *pgs->color[0].ccolor = *pcc;
    (*pcs->type->restrict_color)(pgs->color[0].ccolor, pcs);
    (*pcs->type->adjust_color_count)(&cc_old, pcs, -1);

    return 0;
}

/* currentcolor */
const gs_client_color *
gs_currentcolor(const gs_gstate * pgs)
{
    return pgs->color[0].ccolor;
}

/* currentdevicecolor */
const gx_device_color *
gs_currentdevicecolor(const gs_gstate * pgs)
{
    return pgs->color[0].dev_color;
}

/* ------ Internal procedures ------ */

/* GC descriptors */
private_st_indexed_map();

/* Define a lookup_index procedure that just returns the map values. */
int
lookup_indexed_map(const gs_color_space * pcs, int index, float *values)
{
    int m = cs_num_components(pcs->base_space);
    const float *pv = &pcs->params.indexed.lookup.map->values[index * m];

    memcpy(values, pv, sizeof(*values) * m);
    return 0;
}

/* Free an indexed map and its values when the reference count goes to 0. */
void
free_indexed_map(gs_memory_t * pmem, void *pmap, client_name_t cname)
{
    gs_free_object(pmem, ((gs_indexed_map *) pmap)->values, cname);
    gs_free_object(pmem, pmap, cname);
}

/*
 * Allocate an indexed map for an Indexed or Separation color space.
 */
int
alloc_indexed_map(gs_indexed_map ** ppmap, int nvals, gs_memory_t * pmem,
                  client_name_t cname)
{
    gs_indexed_map *pimap;

    rc_alloc_struct_1(pimap, gs_indexed_map, &st_indexed_map, pmem,
                      return_error(gs_error_VMerror), cname);
    if (nvals > 0) {
        pimap->values =
            (float *)gs_alloc_byte_array(pmem, nvals, sizeof(float), cname);

        if (pimap->values == 0) {
            gs_free_object(pmem, pimap, cname);
            return_error(gs_error_VMerror);
        }
    } else
        pimap->values = 0;
    pimap->rc.free = free_indexed_map;
    pimap->proc_data = 0;       /* for GC */
    pimap->num_values = nvals;
    *ppmap = pimap;
    return 0;
}

/* ---------------- Indexed color spaces ---------------- */

gs_private_st_composite(st_color_space_Indexed, gs_color_space,
     "gs_color_space_Indexed", cs_Indexed_enum_ptrs, cs_Indexed_reloc_ptrs);

/* ------ Color space ------ */

/* Define the Indexed color space type. */
static cs_proc_restrict_color(gx_restrict_Indexed);
static cs_proc_concrete_space(gx_concrete_space_Indexed);
static cs_proc_concretize_color(gx_concretize_Indexed);
static cs_proc_remap_color(gx_remap_IndexedNamed);
static cs_proc_install_cspace(gx_install_Indexed);
static cs_proc_set_overprint(gx_set_overprint_Indexed);
static cs_proc_final(gx_final_Indexed);
static cs_proc_serialize(gx_serialize_Indexed);
static cs_proc_polarity(gx_polarity_Indexed);
const gs_color_space_type gs_color_space_type_Indexed = {
    gs_color_space_index_Indexed, false, false,
    &st_color_space_Indexed, gx_num_components_1,
    gx_init_paint_1, gx_restrict_Indexed,
    gx_concrete_space_Indexed,
    gx_concretize_Indexed, NULL,
    gx_default_remap_color,
    gx_install_Indexed,
    gx_set_overprint_Indexed,
    gx_final_Indexed, gx_no_adjust_color_count,
    gx_serialize_Indexed,
    gx_cspace_is_linear_default, gx_polarity_Indexed
};

/* To keep things vectorized and avoid an if test during the remap proc we
   have another set of procedures to use for indexed color spaces when 
   someone has specified a named color profile and the base space of the
   index color space is DeviceN or Separation */
const gs_color_space_type gs_color_space_type_Indexed_Named = {
    gs_color_space_index_Indexed, false, false,
    &st_color_space_Indexed, gx_num_components_1,
    gx_init_paint_1, gx_restrict_Indexed,
    gx_concrete_space_Indexed,
    gx_concretize_Indexed, NULL,
    gx_remap_IndexedNamed,
    gx_install_Indexed,
    gx_set_overprint_Indexed,
    gx_final_Indexed, gx_no_adjust_color_count,
    gx_serialize_Indexed,
    gx_cspace_is_linear_default, gx_polarity_Indexed
};

/* GC procedures. */

static uint
indexed_table_size(const gs_color_space *pcs)
{
    return (pcs->params.indexed.hival + 1) * pcs->params.indexed.n_comps;
}
static
ENUM_PTRS_WITH(cs_Indexed_enum_ptrs, gs_color_space *pcs) return 0;
case 0:
if (pcs->params.indexed.use_proc)
    ENUM_RETURN((void *)pcs->params.indexed.lookup.map);
else
    return ENUM_CONST_STRING2(pcs->params.indexed.lookup.table.data,
                              indexed_table_size(pcs));
ENUM_PTRS_END
static RELOC_PTRS_WITH(cs_Indexed_reloc_ptrs, gs_color_space *pcs)
{
    if (pcs->params.indexed.use_proc)
        RELOC_PTR(gs_color_space, params.indexed.lookup.map);
    else {
        gs_const_string table;

        table.data = pcs->params.indexed.lookup.table.data;
        table.size = indexed_table_size(pcs);
        RELOC_CONST_STRING_VAR(table);
        pcs->params.indexed.lookup.table.data = table.data;
    }
}
RELOC_PTRS_END

/* Color space installation for an Indexed color space. */

/* Return polarity of base space */
static gx_color_polarity_t
gx_polarity_Indexed(const gs_color_space * pcs)
{
    return (*pcs->base_space->type->polarity)
        ((const gs_color_space *)pcs->base_space);
}

static int
gx_install_Indexed(gs_color_space * pcs, gs_gstate * pgs)
{
    return (*pcs->base_space->type->install_cspace)
        (pcs->base_space, pgs);
}

/* Color space overprint setting ditto. */

static int
gx_set_overprint_Indexed(const gs_color_space * pcs, gs_gstate * pgs)
{
    return (*pcs->base_space->type->set_overprint)
        ((const gs_color_space *)pcs->base_space, pgs);
}

/* Color space finalization ditto. */

static void
gx_final_Indexed(const gs_color_space * pcs)
{
    if (pcs->params.indexed.use_proc) {
        rc_adjust_const(pcs->params.indexed.lookup.map, -1,
                        "gx_adjust_Indexed");
    } else {
        byte *data = (byte *)pcs->params.indexed.lookup.table.data; /* Break 'const'. */

        gs_free_string(pcs->rc.memory, data,
                pcs->params.indexed.lookup.table.size, "gx_final_Indexed");
    }
}

/*
 * Default palette mapping functions for indexed color maps. These just
 * return the values already in the palette.
 *
 * For performance reasons, we provide four functions: special cases for 1,
 * 3, and 4 entry palettes, and a general case. Note that these procedures
 * do not range-check their input values.
 */
static int
map_palette_entry_1(const gs_color_space * pcs, int indx, float *values)
{
    values[0] = pcs->params.indexed.lookup.map->values[indx];
    return 0;
}

static int
map_palette_entry_3(const gs_color_space * pcs, int indx, float *values)
{
    const float *pv = &(pcs->params.indexed.lookup.map->values[3 * indx]);

    values[0] = pv[0];
    values[1] = pv[1];
    values[2] = pv[2];
    return 0;
}

static int
map_palette_entry_4(const gs_color_space * pcs, int indx, float *values)
{
    const float *pv = &(pcs->params.indexed.lookup.map->values[4 * indx]);

    values[0] = pv[0];
    values[1] = pv[1];
    values[2] = pv[2];
    values[3] = pv[3];
    return 0;
}

static int
map_palette_entry_n(const gs_color_space * pcs, int indx, float *values)
{
    int m = cs_num_components(pcs->base_space);

    memcpy((void *)values,
           (const void *)(pcs->params.indexed.lookup.map->values + indx * m),
           m * sizeof(float)
    );

    return 0;
}

/*
 * Allocate an indexed map to be used as a palette for indexed color space.
 */
static gs_indexed_map *
alloc_indexed_palette(
                         const gs_color_space * pbase_cspace,
                         int nvals,
                         gs_memory_t * pmem
)
{
    int num_comps = gs_color_space_num_components(pbase_cspace);
    gs_indexed_map *pimap;
    int code =
    alloc_indexed_map(&pimap, nvals * num_comps, pmem,
                      "alloc_indexed_palette");

    if (code < 0)
        return 0;
    if (num_comps == 1)
        pimap->proc.lookup_index = map_palette_entry_1;
    else if (num_comps == 3)
        pimap->proc.lookup_index = map_palette_entry_3;
    else if (num_comps == 4)
        pimap->proc.lookup_index = map_palette_entry_4;
    else
        pimap->proc.lookup_index = map_palette_entry_n;
    return pimap;
}

/*
 * Build an indexed color space.
 */
int
gs_cspace_build_Indexed(
                           gs_color_space ** ppcspace,
                           gs_color_space * pbase_cspace,
                           uint num_entries,
                           const gs_const_string * ptbl,
                           gs_memory_t * pmem
)
{
    gs_color_space *pcspace = 0;
    gs_indexed_params *pindexed = 0;

    if ((pbase_cspace == 0) || !pbase_cspace->type->can_be_base_space)
        return_error(gs_error_rangecheck);

    pcspace = gs_cspace_alloc(pmem, &gs_color_space_type_Indexed);
    if (pcspace == NULL)
        return_error(gs_error_VMerror);
    pindexed = &(pcspace->params.indexed);
    if (ptbl == 0) {
        pindexed->lookup.map =
            alloc_indexed_palette(pbase_cspace, num_entries, pmem);
        if (pindexed->lookup.map == 0) {
            gs_free_object(pmem, pcspace, "gs_cspace_build_Indexed");
            return_error(gs_error_VMerror);
        }
        pindexed->use_proc = true;
    } else {
        pindexed->lookup.table = *ptbl;
        pindexed->use_proc = false;
    }
    pcspace->base_space = pbase_cspace;
    rc_increment_cs(pbase_cspace);
    pindexed->hival = num_entries - 1;
    pindexed->n_comps = cs_num_components(pbase_cspace);
    *ppcspace = pcspace;
    return 0;
}

/*
 * Return the number of entries in an indexed color space.
 */
int
gs_cspace_indexed_num_entries(const gs_color_space * pcspace)
{
    if (gs_color_space_get_index(pcspace) != gs_color_space_index_Indexed)
        return 0;
    return pcspace->params.indexed.hival + 1;
}

/*
 * Get the palette for an indexed color space. This will return a null
 * pointer if the color space is not an indexed color space or if the
 * color space does not use the mapped index palette.
 */
float *
gs_cspace_indexed_value_array(const gs_color_space * pcspace)
{
    if ((gs_color_space_get_index(pcspace) != gs_color_space_index_Indexed) ||
        pcspace->params.indexed.use_proc
        )
        return 0;
    return pcspace->params.indexed.lookup.map->values;
}

/*
 * Set the lookup procedure to be used with an indexed color space.
 */
int
gs_cspace_indexed_set_proc(
                           gs_color_space * pcspace,
                           int (*proc)(const gs_color_space *, int, float *)
)
{
    if ((gs_color_space_get_index(pcspace) != gs_color_space_index_Indexed) ||
        !pcspace->params.indexed.use_proc
        )
        return_error(gs_error_rangecheck);
    pcspace->params.indexed.lookup.map->proc.lookup_index = proc;
    return 0;
}

/* ------ Colors ------ */

/* Force an Indexed color into legal range. */
static void
gx_restrict_Indexed(gs_client_color * pcc, const gs_color_space * pcs)
{
    float value = pcc->paint.values[0];

    pcc->paint.values[0] =
        (is_fneg(value) ? 0 :
         value >= pcs->params.indexed.hival ? pcs->params.indexed.hival :
         value);
}

/* Color remapping for Indexed color spaces. */
static const gs_color_space *
gx_concrete_space_Indexed(const gs_color_space * pcs,
                          const gs_gstate * pgs)
{
    bool is_lab = false;

    if (gs_color_space_is_PSCIE(pcs->base_space)) {
        if (pcs->base_space->icc_equivalent == NULL) {
            gs_colorspace_set_icc_equivalent(pcs->base_space,
                                                &is_lab, pgs->memory);
        }
        return (pcs->base_space->icc_equivalent);
    }
    return cs_concrete_space(pcs->base_space, pgs);
}

static int
gx_concretize_Indexed(const gs_client_color * pc, const gs_color_space * pcs,
                      frac * pconc, const gs_gstate * pgs, gx_device *dev)
{
    gs_client_color cc;
    const gs_color_space *pbcs =
        (const gs_color_space *)pcs->base_space;
   int code = gs_indexed_limit_and_lookup(pc, pcs, &cc);

    if (code < 0)
        return code;
    return (*pbcs->type->concretize_color) (&cc, pbcs, pconc, pgs, dev);
}

/* We should only be here for cases where the base space is DeviceN or Sep and
   we are doing named color replacement. */
static int
gx_remap_IndexedNamed(const gs_client_color * pcc, const gs_color_space * pcs,
gx_device_color * pdc, const gs_gstate * pgs, gx_device * dev,
gs_color_select_t select)
{
    frac conc[GS_CLIENT_COLOR_MAX_COMPONENTS];
    const gs_color_space *pconcs;
    int i = pcs->type->num_components(pcs);
    gs_client_color cc;
    bool mapped;
    int code = gs_indexed_limit_and_lookup(pcc, pcs, &cc);

    if (code < 0)
        return code;

    pconcs = cs_concrete_space(pcs, pgs);
    /* Now see if we can do the named color replacement */
    mapped = gx_remap_named_color(&cc, pconcs, pdc, pgs, dev, select);

    if (!mapped) {
        /* Named color remap failed perhaps due to colorant not found. Do the 
           old approach of concretize of the base space and remap concrete color */
        const gs_color_space *pbcs =
            (const gs_color_space *)pcs->base_space;

        code = (*pbcs->type->concretize_color) (&cc, pbcs, conc, pgs, dev);
        if (code < 0)
            return code;
        code = (*pconcs->type->remap_concrete_color)(conc, pconcs, pdc, pgs, dev, select);
    }

    /* Save original color space and color info into dev color */
    i = any_abs(i);
    for (i--; i >= 0; i--)
        pdc->ccolor.paint.values[i] = pcc->paint.values[i];
    pdc->ccolor_valid = true;
    return code;
}

/* Look up an index in an Indexed color space. */
int
gs_cspace_indexed_lookup(const gs_color_space *pcs, int index,
                         gs_client_color *pcc)
{
    const gs_indexed_params *pip = &pcs->params.indexed;
    if (pip->use_proc) {
        return pip->lookup.map->proc.lookup_index
            (pcs, index, &pcc->paint.values[0]);
    } else {
        const gs_color_space *pbcs = pcs->base_space;
        int m = cs_num_components(pbcs);
        const byte *pcomp = pip->lookup.table.data + m * index;

        switch (m) {
            default: {          /* DeviceN */
                int i;

                for (i = 0; i < m; ++i)
                    pcc->paint.values[i] = pcomp[i] * (1.0 / 255.0);
            }
                break;
            case 4:
                pcc->paint.values[3] = pcomp[3] * (1.0 / 255.0);
            case 3:
                pcc->paint.values[2] = pcomp[2] * (1.0 / 255.0);
            case 2:
                pcc->paint.values[1] = pcomp[1] * (1.0 / 255.0);
            case 1:
                pcc->paint.values[0] = pcomp[0] * (1.0 / 255.0);
        }
        return 0;
    }
}

/* Look up an index in an Indexed color space, return value as byte value(s). */
int
gs_cspace_indexed_lookup_bytes(const gs_color_space *pcs, float index_float,
                        unsigned char *output)
{
    const gs_indexed_params *pip = &pcs->params.indexed;
    const gs_color_space *pbcs = pcs->base_space;
    int m = cs_num_components(pbcs);
    int index;

    index = (is_fneg(index_float) ? 0 :
    index_float >= pcs->params.indexed.hival ? pcs->params.indexed.hival :
    (int) index_float);

    if (pip->use_proc) {

        float values[GS_CLIENT_COLOR_MAX_COMPONENTS];
        int ok;

        ok = pip->lookup.map->proc.lookup_index(pcs, index, values);

        /* Get out of float and to uchar.
           Note the fall through in the switch statement to
           handle the number of channels */

        switch (m) {
            default: {          /* DeviceN */
                int i;

                for (i = 0; i < m; ++i)
                    output[i] = float_color_to_byte_color(values[i]);
            }
                break;
            case 4:
                output[3] = float_color_to_byte_color(values[3]);
            case 3:
                output[2] = float_color_to_byte_color(values[2]);
            case 2:
                output[1] = float_color_to_byte_color(values[1]);
            case 1:
                output[0] = float_color_to_byte_color(values[0]);
        }

        return ok;

    } else {

        /* Here it uses a 1-D LUT. Again the fall through
            in the switch statement */

        const byte *pcomp = pip->lookup.table.data + m * index;

        switch (m) {
            default: {          /* DeviceN */
                int i;

                for (i = 0; i < m; ++i)
                    output[i] = pcomp[i];
            }
                break;
            case 4:
                output[3] = pcomp[3];
            case 3:
                output[2] = pcomp[2];
            case 2:
                output[1] = pcomp[1];
            case 1:
                output[0] = pcomp[0];
        }
        return 0;
    }
}

/* Look up an index in an Indexed color space, return value as frac value(s). */
int
gs_cspace_indexed_lookup_frac(const gs_color_space *pcs, float index_float,
                        frac *output)
{
    const gs_indexed_params *pip = &pcs->params.indexed;
    const gs_color_space *pbcs = pcs->base_space;
    int m = cs_num_components(pbcs);
    int index;

    index = (is_fneg(index_float) ? 0 :
    index_float >= pcs->params.indexed.hival ? pcs->params.indexed.hival :
    (int) index_float);

    if (pip->use_proc) {

        float values[GS_CLIENT_COLOR_MAX_COMPONENTS];
        int ok;

        ok = pip->lookup.map->proc.lookup_index(pcs, index, values);

        /* Get out of float and to frac.
           Note the fall through in the switch statement to
           handle the number of channels */

        switch (m) {
            default: {          /* DeviceN */
                int i;

                for (i = 0; i < m; ++i)
                    output[i] = float2frac(values[i]);
            }
                break;
            case 4:
                output[3] = float2frac(values[3]);
            case 3:
                output[2] = float2frac(values[2]);
            case 2:
                output[1] = float2frac(values[1]);
            case 1:
                output[0] = float2frac(values[0]);
        }

        return ok;

    } else {

        /* Here it uses a 1-D LUT
           Again the fall through */

        const byte *pcomp = pip->lookup.table.data + m * index;

        switch (m) {
            default: {          /* DeviceN */
                int i;

                for (i = 0; i < m; ++i)
                    output[i] = byte2frac(pcomp[i]);
            }
                break;
            case 4:
                output[3] = byte2frac(pcomp[3]);
            case 3:
                output[2] = byte2frac(pcomp[2]);
            case 2:
                output[1] = byte2frac(pcomp[1]);
            case 1:
                output[0] = byte2frac(pcomp[0]);
        }
        return 0;
    }
}

/* Look up with restriction */

int
gs_indexed_limit_and_lookup(const gs_client_color * pc,const gs_color_space *pcs,
                         gs_client_color *pcc)
{

    float value = pc->paint.values[0] + 0.001;
        int index =
            (is_fneg(value) ? 0 :
             value >= pcs->params.indexed.hival ? pcs->params.indexed.hival :
             (int)value);
         return(gs_cspace_indexed_lookup(pcs, index, pcc));

}

/* ---------------- Serialization. -------------------------------- */

static int
gx_serialize_Indexed(const gs_color_space * pcs, stream * s)
{
    const gs_indexed_params * p = &pcs->params.indexed;
    uint n;
    int code = gx_serialize_cspace_type(pcs, s);

    if (code < 0)
        return code;
    code = cs_serialize(pcs->base_space, s);
    if (code < 0)
        return code;
    code = sputs(s, (const byte *)&p->hival, sizeof(p->hival), &n);
    if (code < 0)
        return code;
    code = sputs(s, (const byte *)&p->use_proc, sizeof(p->use_proc), &n);
    if (code < 0)
        return code;
    if (p->use_proc) {
        code = sputs(s, (const byte *)&p->lookup.map->num_values,
                sizeof(p->lookup.map->num_values), &n);
        if (code < 0)
            return code;
        code = sputs(s, (const byte *)&p->lookup.map->values[0],
                sizeof(p->lookup.map->values[0]) * p->lookup.map->num_values, &n);
    } else {
        code = sputs(s, (const byte *)&p->lookup.table.size,
                        sizeof(p->lookup.table.size), &n);
        if (code < 0)
            return code;
        code = sputs(s, p->lookup.table.data, p->lookup.table.size, &n);
    }
    return code;
}

/* ---------------- High level device support -------------------------------- */

/*
 * This special function forces a device to include the current
 * color space into the output. Returns 'rangecheck' if the device can't handle it.
 * The primary reason is to include DefaultGray, DefaultRGB, DefaultCMYK into PDF.
 * Should be called for each page that requires the resource.
 * Redundant calls per page with same cspace id are allowed.
 * Redundant calls per page with different cspace id are are allowed but
 * highly undesirable.
 * No need to call it with color spaces explicitly referred by the document,
 * because they are included automatically.
 * res_name and name_length passes the resource name.
 */
int
gs_includecolorspace(gs_gstate * pgs, const byte *res_name, int name_length)
{
    return (*dev_proc(pgs->device, include_color_space))(pgs->device, gs_currentcolorspace_inline(pgs), res_name, name_length);
}
