harvey/sys/src/cmd/gs/src/gscscie.c

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*/

/*$Id: gscscie.c,v 1.4 2001/03/17 01:15:42 raph Exp $ */
/* CIE color space management */
#include "math_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsstruct.h"
#include "gsmatrix.h"		/* for gscolor2.h */
#include "gxcspace.h"
#include "gscolor2.h"		/* for gs_set/currentcolorrendering */
#include "gxcie.h"
#include "gxarith.h"
#include "gxdevice.h"		/* for gxcmap.h */
#include "gxcmap.h"
#include "gzstate.h"

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

/* GC descriptors */
public_st_cie_common();
public_st_cie_common_elements();
private_st_cie_a();
private_st_cie_abc();
private_st_cie_def();
private_st_cie_defg();

/* Define the CIE color space types. */

/* CIEBasedDEFG */
gs_private_st_ptrs1(st_color_space_CIEDEFG, gs_base_color_space,
     "gs_color_space(CIEDEFG)", cs_CIEDEFG_enum_ptrs, cs_CIEDEFG_reloc_ptrs,
		    params.defg);
private cs_proc_adjust_cspace_count(gx_adjust_cspace_CIEDEFG);
const gs_color_space_type gs_color_space_type_CIEDEFG = {
    gs_color_space_index_CIEDEFG, true, true,
    &st_color_space_CIEDEFG, gx_num_components_4,
    gx_no_base_space, gx_cspace_not_equal,
    gx_init_CIE, gx_restrict_CIEDEFG,
    gx_concrete_space_CIE,
    gx_concretize_CIEDEFG, NULL,
    gx_default_remap_color, gx_install_CIE,
    gx_adjust_cspace_CIEDEFG, gx_no_adjust_color_count
};

/* CIEBasedDEF */
gs_private_st_ptrs1(st_color_space_CIEDEF, gs_base_color_space,
	"gs_color_space(CIEDEF)", cs_CIEDEF_enum_ptrs, cs_CIEDEF_reloc_ptrs,
		    params.def);
private cs_proc_adjust_cspace_count(gx_adjust_cspace_CIEDEF);
const gs_color_space_type gs_color_space_type_CIEDEF = {
    gs_color_space_index_CIEDEF, true, true,
    &st_color_space_CIEDEF, gx_num_components_3,
    gx_no_base_space, gx_cspace_not_equal,
    gx_init_CIE, gx_restrict_CIEDEF,
    gx_concrete_space_CIE,
    gx_concretize_CIEDEF, NULL,
    gx_default_remap_color, gx_install_CIE,
    gx_adjust_cspace_CIEDEF, gx_no_adjust_color_count
};

/* CIEBasedABC */
gs_private_st_ptrs1(st_color_space_CIEABC, gs_base_color_space,
	"gs_color_space(CIEABC)", cs_CIEABC_enum_ptrs, cs_CIEABC_reloc_ptrs,
		    params.abc);
private cs_proc_adjust_cspace_count(gx_adjust_cspace_CIEABC);
const gs_color_space_type gs_color_space_type_CIEABC = {
    gs_color_space_index_CIEABC, true, true,
    &st_color_space_CIEABC, gx_num_components_3,
    gx_no_base_space, gx_cspace_not_equal,
    gx_init_CIE, gx_restrict_CIEABC,
    gx_concrete_space_CIE,
    gx_concretize_CIEABC, NULL,
    gx_remap_CIEABC, gx_install_CIE,
    gx_adjust_cspace_CIEABC, gx_no_adjust_color_count
};

/* CIEBasedA */
gs_private_st_ptrs1(st_color_space_CIEA, gs_base_color_space,
	      "gs_color_space(CIEA)", cs_CIEA_enum_ptrs, cs_CIEA_reloc_ptrs,
		    params.a);
private cs_proc_adjust_cspace_count(gx_adjust_cspace_CIEA);
const gs_color_space_type gs_color_space_type_CIEA = {
    gs_color_space_index_CIEA, true, true,
    &st_color_space_CIEA, gx_num_components_1,
    gx_no_base_space, gx_cspace_not_equal,
    gx_init_CIE, gx_restrict_CIEA,
    gx_concrete_space_CIE,
    gx_concretize_CIEA, NULL,
    gx_default_remap_color, gx_install_CIE,
    gx_adjust_cspace_CIEA, gx_no_adjust_color_count
};

/* Determine the concrete space underlying a CIEBased space. */
const gs_color_space *
gx_concrete_space_CIE(const gs_color_space * pcs, const gs_imager_state * pis)
{
    const gs_cie_render *pcie = pis->cie_render;

    if (pcie == 0 || pcie->RenderTable.lookup.table == 0 ||
	pcie->RenderTable.lookup.m == 3
	)
	return gs_cspace_DeviceRGB(pis);
    else			/* pcie->RenderTable.lookup.m == 4 */
	return gs_cspace_DeviceCMYK(pis);
}

/* Install a CIE space in the graphics state. */
/* We go through an extra level of procedure so that */
/* interpreters can substitute their own installer. */
/* This procedure is exported for the benefit of gsicc.c */
int
gx_install_CIE(const gs_color_space * pcs, gs_state * pgs)
{
    return (*pcs->params.a->common.install_cspace) (pcs, pgs);
}

/* Adjust reference counts for a CIE color space */
private void
gx_adjust_cspace_CIEDEFG(const gs_color_space * pcs, int delta)
{
    rc_adjust_const(pcs->params.defg, delta, "gx_adjust_cspace_CIEDEFG");
}

private void
gx_adjust_cspace_CIEDEF(const gs_color_space * pcs, int delta)
{
    rc_adjust_const(pcs->params.def, delta, "gx_adjust_cspace_CIEDEF");
}

private void
gx_adjust_cspace_CIEABC(const gs_color_space * pcs, int delta)
{
    rc_adjust_const(pcs->params.abc, delta, "gx_adjust_cspace_CIEABC");
}

private void
gx_adjust_cspace_CIEA(const gs_color_space * pcs, int delta)
{
    rc_adjust_const(pcs->params.a, delta, "gx_adjust_cspace_CIEA");
}

/* ---------------- Procedures ---------------- */

/* ------ Internal initializers ------ */

/*
 * Set up the default values for the CIE parameters that are common to
 * all CIE color spaces.
 *
 * There is no default for the white point, so it is set equal to the
 * black point. If anyone actually uses the color space in that form,
 * the results are likely to be unsatisfactory.
 *
 * This procedure is exported for the benefit of gsicc.c.
 */
void
gx_set_common_cie_defaults(gs_cie_common * pcommon, void *client_data)
{
    pcommon->RangeLMN = Range3_default;
    pcommon->DecodeLMN = DecodeLMN_default;
    pcommon->MatrixLMN = Matrix3_default;
    pcommon->points.WhitePoint = BlackPoint_default;
    pcommon->points.BlackPoint = BlackPoint_default;
    pcommon->client_data = client_data;
}

/*
 * Set defaults for a CIEBasedABC color space.  This is also used for
 * CIEBasedDEF and CIEBasedDEFG color spaces.
 */
private void
set_cie_abc_defaults(gs_cie_abc * pabc, void *client_data)
{
    gx_set_common_cie_defaults(&pabc->common, client_data);
    pabc->RangeABC = Range3_default;
    pabc->DecodeABC = DecodeABC_default;
    pabc->MatrixABC = Matrix3_default;
}

/*
 * Set up a default color lookup table for a CIEBasedDEF[G] space. There is
 * no specified default for this structure, so the values used here (aside
 * from the input and output component numbers) are intended only to make
 * the system fail in a predictable manner.
 */
private void
set_ctbl_defaults(gx_color_lookup_table * plktblp, int num_comps)
{
    int i;

    plktblp->n = num_comps;
    plktblp->m = 3;		/* always output CIE ABC */
    for (i = 0; i < countof(plktblp->dims); i++)
	plktblp->dims[i] = 0;
    plktblp->table = 0;
}

/*
 * Allocate a color space and its parameter structure.
 * Return 0 if VMerror, otherwise the parameter structure.
 *
 * This is exported for the benefit of gsicc.c
 */
void *
gx_build_cie_space(gs_color_space ** ppcspace,
		const gs_color_space_type * pcstype,
		gs_memory_type_ptr_t stype, gs_memory_t * pmem)
{
    gs_color_space *pcspace;
    int code = gs_cspace_alloc(&pcspace, pcstype, pmem);
    gs_cie_common_elements_t *pdata;

    if (code < 0)
	return 0;
    rc_alloc_struct_1(pdata, gs_cie_common_elements_t, stype, pmem,
		      {
		      gs_free_object(pmem, pcspace, "gx_build_cie_space");
		      return 0;
		      }
		      ,
		      "gx_build_cie_space(data)");
    *ppcspace = pcspace;
    return (void *)pdata;
}

/* ------ Constructors ------ */

int
gs_cspace_build_CIEA(gs_color_space ** ppcspace, void *client_data,
		     gs_memory_t * pmem)
{
    gs_cie_a *pciea =
    gx_build_cie_space(ppcspace, &gs_color_space_type_CIEA, &st_cie_a, pmem);

    if (pciea == 0)
	return_error(gs_error_VMerror);

    gx_set_common_cie_defaults(&pciea->common, client_data);
    pciea->common.install_cspace = gx_install_CIEA;
    pciea->RangeA = RangeA_default;
    pciea->DecodeA = DecodeA_default;
    pciea->MatrixA = MatrixA_default;

    (*ppcspace)->params.a = pciea;
    return 0;
}

int
gs_cspace_build_CIEABC(gs_color_space ** ppcspace, void *client_data,
		       gs_memory_t * pmem)
{
    gs_cie_abc *pabc =
    gx_build_cie_space(ppcspace, &gs_color_space_type_CIEABC, &st_cie_abc,
		       pmem);

    if (pabc == 0)
	return_error(gs_error_VMerror);

    set_cie_abc_defaults(pabc, client_data);
    pabc->common.install_cspace = gx_install_CIEABC;

    (*ppcspace)->params.abc = pabc;
    return 0;
}

int
gs_cspace_build_CIEDEF(gs_color_space ** ppcspace, void *client_data,
		       gs_memory_t * pmem)
{
    gs_cie_def *pdef =
    gx_build_cie_space(ppcspace, &gs_color_space_type_CIEDEF, &st_cie_def,
		       pmem);

    if (pdef == 0)
	return_error(gs_error_VMerror);

    set_cie_abc_defaults((gs_cie_abc *) pdef, client_data);
    pdef->common.install_cspace = gx_install_CIEDEF;
    pdef->RangeDEF = Range3_default;
    pdef->DecodeDEF = DecodeDEF_default;
    pdef->RangeHIJ = Range3_default;
    set_ctbl_defaults(&pdef->Table, 3);

    (*ppcspace)->params.def = pdef;
    return 0;
}

int
gs_cspace_build_CIEDEFG(gs_color_space ** ppcspace, void *client_data,
			gs_memory_t * pmem)
{
    gs_cie_defg *pdefg =
    gx_build_cie_space(ppcspace, &gs_color_space_type_CIEDEFG, &st_cie_defg,
		       pmem);

    if (pdefg == 0)
	return_error(gs_error_VMerror);

    set_cie_abc_defaults((gs_cie_abc *) pdefg, client_data);
    pdefg->common.install_cspace = gx_install_CIEDEFG;
    pdefg->RangeDEFG = Range4_default;
    pdefg->DecodeDEFG = DecodeDEFG_default;
    pdefg->RangeHIJK = Range4_default;
    set_ctbl_defaults(&pdefg->Table, 4);

    (*ppcspace)->params.defg = pdefg;
    return 0;
}

/* ------ Accessors ------ */

int
gs_cie_defx_set_lookup_table(gs_color_space * pcspace, int *pdims,
			     const gs_const_string * ptable)
{
    gx_color_lookup_table *plktblp;

    switch (gs_color_space_get_index(pcspace)) {
	case gs_color_space_index_CIEDEF:
	    plktblp = &pcspace->params.def->Table;
	    break;
	case gs_color_space_index_CIEDEFG:
	    plktblp = &pcspace->params.defg->Table;
	    plktblp->dims[3] = pdims[3];
	    break;
	default:
	    return_error(gs_error_rangecheck);
    }

    plktblp->dims[0] = pdims[0];
    plktblp->dims[1] = pdims[1];
    plktblp->dims[2] = pdims[2];
    plktblp->table = ptable;
    return 0;
}