path: root/gs/src/gscie.h

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  requires that the copyright notice and this notice be preserved on all
  copies.
*/

/*$Id$ */
/* Structures for CIE color algorithms */
/* (requires gscspace.h, gscolor2.h) */

#ifndef gscie_INCLUDED
#  define gscie_INCLUDED

#include "gconfigv.h"		/* for USE_FPU */
#include "gsrefct.h"
#include "gsstype.h"		/* for extern_st */
#include "gxctable.h"

/* ---------------- Configuration parameters ---------------- */

/* Define the size of the Encode/Decode/Transform procedure value caches. */
/* With the current design, these caches must all have the same size. */
#ifndef CIE_LOG2_CACHE_SIZE
#  define CIE_LOG2_CACHE_SIZE 9
#endif

/* Define whether to use fixed- or floating-point values in the caches. */
/*#define CIE_CACHE_USE_FIXED */
#if USE_FPU < 0
#  define CIE_CACHE_USE_FIXED
#endif

/* If we are using fixed-point values, define the number of fraction bits. */
#define CIE_FIXED_FRACTION_BITS 12

/* Define whether to interpolate between cached values. */
#define CIE_CACHE_INTERPOLATE

/* Define whether to interpolate at all intermediate lookup steps. */
/* This is computationally expensive and doesn't seem to improve */
/* the accuracy of the result. */
/*#define CIE_INTERPOLATE_INTERMEDIATE */

/* Define whether to interpolate in the RenderTable. */
/* This is computationally very expensive, so it is normally disabled. */
#define CIE_RENDER_TABLE_INTERPOLATE

/* ------ Derived values ------ */

/* from CIE_LOG2_CACHE_SIZE */
#define gx_cie_log2_cache_size CIE_LOG2_CACHE_SIZE
#define gx_cie_cache_size (1 << gx_cie_log2_cache_size)

/* From CIE_FIXED_FRACTION_BITS 12 */
#ifndef CIE_FIXED_FRACTION_BITS
/* Take as many bits as we can without having to multiply in two pieces. */
#  define CIE_FIXED_FRACTION_BITS\
     ((arch_sizeof_long * 8 - gx_cie_log2_cache_size) / 2 - 1)
#endif

/* From CIE_RENDER_TABLE_INTERPOLATE */
#ifdef CIE_RENDER_TABLE_INTERPOLATE
#  define CIE_CACHE_INTERPOLATE
#endif

#define float_lshift(v, nb) ((v) * (1L << (nb)))
#define float_rshift(v, nb) ((v) * (1.0 / (1L << (nb))))

#ifdef CIE_CACHE_INTERPOLATE
/* We have to have room for both a cache index and the interpolation bits */
/* in a positive int (i.e., leaving 1 bit for the sign), plus a little slop. */
/* The values for interpolation are cie_cached_values by default. */
#  define _cie_interpolate_bits\
     min(arch_sizeof_int * 8 - gx_cie_log2_cache_size - 2, 10)
#  define _cix(i) ((i) >> _cie_interpolate_bits)
#  define _cif(i) ((int)(i) & ((1 << _cie_interpolate_bits) - 1))
#  define cie_interpolate_between(v0, v1, i)\
     ((v0) + cie_cached_rshift(((v1) - (v0)) * _cif(i) +\
			        (1 << (_cie_interpolate_bits - 1)),\
			       _cie_interpolate_bits))
#  define cie_interpolate(p, i)\
     cie_interpolate_between((p)[_cix(i)], (p)[_cix(i) + 1], i)
#  define cie_interpolate_fracs(p, i)\
     ((p)[_cix(i)] +\
      (frac)arith_rshift((long)((p)[_cix(i) + 1] - (p)[_cix(i)]) * _cif(i), _cie_interpolate_bits))
#else
#  define _cie_interpolate_bits 0
#  define cie_interpolate_between(v0, v1, i) (v0)
#  define cie_interpolate(p, i) ((p)[i])
#  define cie_interpolate_fracs(p, i) ((p)[i])
#endif

#ifdef CIE_CACHE_USE_FIXED
typedef long cie_cached_value;

#  define _cie_fixed_shift CIE_FIXED_FRACTION_BITS
#  define float2cie_cached(v)\
     ((cie_cached_value)float_lshift(v, _cie_fixed_shift))
#  define cie_cached2float(v)\
     float_rshift(v, _cie_fixed_shift)
#  define cie_cached2int(v, fbits)\
     arith_rshift(v, _cie_fixed_shift - (fbits))
/* We are multiplying two cie_cached_values to produce a result that */
/* lies between 0 and gx_cie_cache_size - 1.  If the intermediate result */
/* might overflow, compute it in pieces (being a little sloppy). */
#  define _cie_product_excess_bits\
     (_cie_fixed_shift * 2 + gx_cie_log2_cache_size - (arch_sizeof_long * 8 - 1))
#  define cie_cached_product2int(v, factor, fbits)\
     (_cie_product_excess_bits > 0 ?\
      arith_rshift( (v) * arith_rshift(factor, _cie_product_excess_bits) +\
		    arith_rshift(v, _cie_product_excess_bits) *\
		     ((factor) & ((1 << _cie_product_excess_bits) - 1)),\
		    _cie_fixed_shift * 2 - _cie_product_excess_bits - (fbits)) :\
      arith_rshift((v) * (factor), _cie_fixed_shift * 2 - (fbits)))
#  define cie_cached_rshift(v, n) arith_rshift(v, n)
#else
typedef float cie_cached_value;
#  define float2cie_cached(v) (v)
#  define cie_cached2float(v) (v)
#  define cie_cached2int(v, fbits)\
     ((int)float_lshift(v, fbits))
#  define cie_cached_product2int(v, factor, fbits)\
     ((int)float_lshift((v) * (factor), fbits))
#  define cie_cached_rshift(v, n) float_rshift(v, n)
#endif

/* ---------------- Structures ---------------- */

#ifndef gs_cie_render_DEFINED
#  define gs_cie_render_DEFINED
typedef struct gs_cie_render_s gs_cie_render;
#endif

/* ------ Common definitions ------ */

/*
 * For the purposes of the CIE routines, we consider that all the vectors
 * are column vectors, that the matrices are specified in column order
 * (e.g., the matrix
 *      [ A B C ]
 *      [ D E F ]
 *      [ G H I ]
 * is represented as [A D G B E H C F I]), and that to transform a vector
 * V by a matrix M, we compute M * V to produce another column vector.
 * Note in particular that in order to produce a matrix M that is
 * equivalent to transforming by M1 and then by M2, we must compute
 * M = M2 * M1.
 */

/* A 3-element vector. */
typedef struct gs_vector3_s {
    float u, v, w;
} gs_vector3;

/* A 3x3 matrix, stored in column order. */
typedef struct gs_matrix3_s {
    gs_vector3 cu, cv, cw;
    bool is_identity;
} gs_matrix3;

/* 3- and 4-element vectors of ranges. */
typedef struct gs_range_s {
    float rmin, rmax;
} gs_range;
typedef struct gs_range3_s {
    gs_range ranges[3];
} gs_range3;
typedef struct gs_range4_s {
    gs_range ranges[4];
} gs_range4;

/* Client-supplied transformation procedures. */
typedef struct gs_cie_common_s gs_cie_common;
typedef struct gs_cie_wbsd_s gs_cie_wbsd;

typedef float (*gs_cie_a_proc) (P2(floatp, const gs_cie_a *));

typedef float (*gs_cie_abc_proc) (P2(floatp, const gs_cie_abc *));
typedef struct gs_cie_abc_proc3_s {
    gs_cie_abc_proc procs[3];
} gs_cie_abc_proc3;

typedef float (*gs_cie_def_proc) (P2(floatp, const gs_cie_def *));
typedef struct gs_cie_def_proc3_s {
    gs_cie_def_proc procs[3];
} gs_cie_def_proc3;

typedef float (*gs_cie_defg_proc) (P2(floatp, const gs_cie_defg *));
typedef struct gs_cie_defg_proc4_s {
    gs_cie_defg_proc procs[4];
} gs_cie_defg_proc4;

typedef float (*gs_cie_common_proc) (P2(floatp, const gs_cie_common *));
typedef struct gs_cie_common_proc3_s {
    gs_cie_common_proc procs[3];
} gs_cie_common_proc3;

typedef float (*gs_cie_render_proc) (P2(floatp, const gs_cie_render *));
typedef struct gs_cie_render_proc3_s {
    gs_cie_render_proc procs[3];
} gs_cie_render_proc3;

/*
 * The TransformPQR procedure depends on both the color space and the
 * CRD, so we can't simply pass it through the band list as a table of
 * sampled values, even though such a table exists as part of an
 * internal cache.  Instead, we use two different approaches.  The
 * graphics library knows that the cache must be reloaded whenever the
 * color space or CRD changes, so we can simply transmit the cached
 * values through the band list whenever this occurs.  However, this
 * still leaves the issue of how to represent the procedure in the CRD
 * per se: such a representation is required in order for
 * currentcolorrendering and setcolorrendering to work.  For this
 * purpose, we provide a procedure name and procedure data, which
 * drivers can supply with their default CRDs; the driver must also be
 * prepared to map the procedure name back to an actual set of
 * procedures.
 *
 * To simplify the driver-provided CRD machinery, we define TransformPQR as
 * a single procedure taking an integer that specifies the component number,
 * rather than an array of procedures.  Note that if proc_name != 0,
 * proc is irrelevant -- the driver will provide it by looking up proc_name.
 * For this reason, the last argument of TransformPQR must be writable.
 * Note also that since TransformPQR can fail (if the driver doesn't
 * recognize the proc_name), it must return a failure code.
 */
typedef int (*gs_cie_transform_proc)(P5(int, floatp, const gs_cie_wbsd *,
					gs_cie_render *, float *));
typedef struct gs_cie_transform_proc3_s {
    gs_cie_transform_proc proc;
    const char *proc_name;
    gs_const_string proc_data;
    const char *driver_name;	/* for mapping proc_name back to procs */
} gs_cie_transform_proc3;

typedef frac(*gs_cie_render_table_proc) (P2(byte, const gs_cie_render *));
typedef struct gs_cie_render_table_procs_s {
    gs_cie_render_table_proc procs[4];
} gs_cie_render_table_procs;

/* CIE white and black points. */
typedef struct gs_cie_wb_s {
    gs_vector3 WhitePoint;
    gs_vector3 BlackPoint;
} gs_cie_wb;

/* ------ Caches ------ */

/*
 * Given that all the client-supplied procedures involved in CIE color
 * mapping and rendering are monotonic, and given that we can determine
 * the minimum and maximum input values for them, we can cache their values.
 * This takes quite a lot of space, but eliminates the need for callbacks
 * deep in the graphics code (particularly the image operator).
 *
 * The procedures, and how we determine their domains, are as follows:

 Stage          Name            Domain determination
 -----          ----            --------------------
 pre-decode     DecodeDEF       RangeDEF
 pre-decode     DecodeDEFG      RangeDEFG
 color space    DecodeA         RangeA
 color space    DecodeABC       RangeABC
 color space    DecodeLMN       RangeLMN
 rendering      TransformPQR    RangePQR
 (but depends on color space White/BlackPoints)
 rendering      EncodeLMN       RangePQR transformed by the inverse of
				MatrixPQR and then by MatrixLMN
 rendering      EncodeABC       RangeLMN transformed by MatrixABC
 rendering      RenderTable.T   [0..1]*m

 * Note that we can mostly cache the results of the color space procedures
 * without knowing the color rendering parameters, and vice versa,
 * because of the range parameters supplied in the dictionaries.
 * Unfortunately, TransformPQR is an exception.
 */
/*
 * The index into a cache is (value - base) * factor, where
 * factor is computed as (cie_cache_size - 1) / (rmax - rmin).
 */
/*
 * We have two kinds of caches: ordinary caches, where each value is
 * a scalar, and vector caches, where each value is a gs_cached_vector3.
 * The latter allow us to pre-multiply the values by one column of
 * a gs_matrix3, avoiding multiplications at lookup time.
 *
 * If the function being cached is simply a linear transformation,
 * f(x) = scale * x + origin, then we can fold it into a following or
 * preceding matrix.
 */
typedef struct cie_linear_params_s {
    bool is_linear;
    float scale, origin;
} cie_linear_params_t;
typedef struct cie_cache_params_s {
    bool is_identity;		/* must come first */
    float base, factor;
    cie_linear_params_t linear;	/* only used in vector_cache.floats? */
} cie_cache_params;
typedef struct cie_cache_floats_s {
    cie_cache_params params;
    float values[gx_cie_cache_size];
} cie_cache_floats;
typedef struct cie_cache_fracs_s {
    cie_cache_params params;
    frac values[gx_cie_cache_size];
} cie_cache_fracs;
typedef struct cie_cache_ints_s {
    cie_cache_params params;
    int values[gx_cie_cache_size];
} cie_cache_ints;
typedef union gx_cie_scalar_cache_s {
    cie_cache_floats floats;
    cie_cache_fracs fracs;
    cie_cache_ints ints;
} gx_cie_scalar_cache;

typedef struct cie_cached_vector3_s {
    cie_cached_value u, v, w;
} cie_cached_vector3;
typedef struct cie_vector_cache_params_s {
    cie_cached_value base, factor, limit;
} cie_vector_cache_params;
typedef struct cie_cache_vectors_s {
    cie_vector_cache_params params;
    cie_cached_vector3 values[gx_cie_cache_size];
} cie_cache_vectors;
typedef struct gx_cie_vector_cache_s {
    cie_cache_floats floats;
    cie_cache_vectors vecs;
} gx_cie_vector_cache;

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

/* Elements common to all CIE color space dictionaries. */
struct gs_cie_common_s {
    int (*install_cspace)(P2(const gs_color_space *, gs_state *));
    void *client_data;
    gs_range3 RangeLMN;
    gs_cie_common_proc3 DecodeLMN;
    gs_matrix3 MatrixLMN;
    gs_cie_wb points;
    /* Following are computed when structure is initialized. */
    struct {
	gx_cie_scalar_cache DecodeLMN[3];
    } caches;
};

/* st_cie_common and st_cie_common_elements_t are exported for gsicc.c */
#define public_st_cie_common()     /* in gscscie.c */\
  gs_public_st_ptrs1(st_cie_common, gs_cie_common, "gs_cie_common",\
		      cie_common_enum_ptrs, cie_common_reloc_ptrs, client_data)

/* extern_st(st_cie_common); */ /* in gxcie.h */

#define gs_cie_common_elements\
	gs_cie_common common;		/* must be first */\
	rc_header rc
typedef struct gs_cie_common_elements_s {
    gs_cie_common_elements;
} gs_cie_common_elements_t;

#define public_st_cie_common_elements() /* in gscscie.c */ \
  gs_public_st_suffix_add0_local( st_cie_common_elements_t,\
				  gs_cie_common_elements_t,\
				  "gs_cie_common_elements_t",\
				  cie_common_enum_ptrs,\
				  cie_common_reloc_ptrs,\
				  st_cie_common)

/* extern_st(st_cie_common_elements_t); */ /* in gxcie.h */

/* A CIEBasedA dictionary. */
struct gs_cie_a_s {
    gs_cie_common_elements;	/* must be first */
    gs_range RangeA;
    gs_cie_a_proc DecodeA;
    gs_vector3 MatrixA;
    /* Following are computed when structure is initialized. */
    struct {
	gx_cie_vector_cache DecodeA;	/* mult. by MatrixA */
    } caches;
};

#define private_st_cie_a()	/* in gscscie.c */\
  gs_private_st_suffix_add0_local(st_cie_a, gs_cie_a, "gs_cie_a",\
				  cie_common_enum_ptrs,\
				  cie_common_reloc_ptrs,\
				  st_cie_common_elements_t)

/* Common elements for CIEBasedABC, DEF, and DEFG dictionaries. */
#define gs_cie_abc_elements\
	gs_cie_common_elements;		/* must be first */\
	gs_range3 RangeABC;\
	gs_cie_abc_proc3 DecodeABC;\
	gs_matrix3 MatrixABC;\
		/* Following are computed when structure is initialized. */\
	struct {\
		bool skipABC;\
		gx_cie_vector_cache DecodeABC[3];  /* mult. by MatrixABC */\
	} caches

/* A CIEBasedABC dictionary. */
struct gs_cie_abc_s {
    gs_cie_abc_elements;
};

#define private_st_cie_abc()	/* in gscscie.c */\
  gs_private_st_suffix_add0_local(st_cie_abc, gs_cie_abc, "gs_cie_abc",\
				  cie_common_enum_ptrs, cie_common_reloc_ptrs,\
				  st_cie_common_elements_t)

/* A CIEBasedDEF dictionary. */
struct gs_cie_def_s {
    gs_cie_abc_elements;	/* must be first */
    gs_range3 RangeDEF;
    gs_cie_def_proc3 DecodeDEF;
    gs_range3 RangeHIJ;
    gx_color_lookup_table Table;	/* [NH][NI * NJ * 3] */
    struct {
	gx_cie_scalar_cache DecodeDEF[3];
    } caches_def;
};

#define private_st_cie_def()	/* in gscscie.c */\
  gs_private_st_suffix_add1(st_cie_def, gs_cie_def, "gs_cie_def",\
                            cie_def_enum_ptrs, cie_def_reloc_ptrs,\
                            st_cie_abc, Table.table)

/* A CIEBasedDEFG dictionary. */
struct gs_cie_defg_s {
    gs_cie_abc_elements;
    gs_range4 RangeDEFG;
    gs_cie_defg_proc4 DecodeDEFG;
    gs_range4 RangeHIJK;
    gx_color_lookup_table Table;	/* [NH * NI][NJ * NK * 3] */
    struct {
	gx_cie_scalar_cache DecodeDEFG[4];
    } caches_defg;
};

#define private_st_cie_defg()	/* in gscscie.c */\
  gs_private_st_suffix_add1(st_cie_defg, gs_cie_defg, "gs_cie_defg",\
			    cie_defg_enum_ptrs, cie_defg_reloc_ptrs,\
			    st_cie_abc, Table.table)

/*
 * Default values for components.  Note that for some components, there are
 * two sets of default procedures: _default (identity procedures) and
 * _from_cache (procedures that just return the cached values).
 */
extern const gs_range3 Range3_default;
extern const gs_range4 Range4_default;
extern const gs_cie_defg_proc4 DecodeDEFG_default;
extern const gs_cie_defg_proc4 DecodeDEFG_from_cache;
extern const gs_cie_def_proc3 DecodeDEF_default;
extern const gs_cie_def_proc3 DecodeDEF_from_cache;
extern const gs_cie_abc_proc3 DecodeABC_default;
extern const gs_cie_abc_proc3 DecodeABC_from_cache;
extern const gs_cie_common_proc3 DecodeLMN_default;
extern const gs_cie_common_proc3 DecodeLMN_from_cache;
extern const gs_matrix3 Matrix3_default;
extern const gs_range RangeA_default;
extern const gs_cie_a_proc DecodeA_default;
extern const gs_cie_a_proc DecodeA_from_cache;
extern const gs_vector3 MatrixA_default;
extern const gs_vector3 BlackPoint_default;
extern const gs_cie_render_proc3 Encode_default;
extern const gs_cie_render_proc3 EncodeLMN_from_cache;
extern const gs_cie_render_proc3 EncodeABC_from_cache;
extern const gs_cie_transform_proc3 TransformPQR_default;
extern const gs_cie_transform_proc3 TransformPQR_from_cache;
extern const gs_cie_transform_proc TransformPQR_lookup_proc_name;
extern const gs_cie_render_table_procs RenderTableT_default;
extern const gs_cie_render_table_procs RenderTableT_from_cache;

/* ------ Rendering dictionaries ------ */

struct gs_cie_wbsd_s {
    struct {
	gs_vector3 xyz, pqr;
    } ws, bs, wd, bd;
};
typedef struct gs_cie_render_table_s {
    /*
     * If lookup.table == 0, the other members (of both lookup and T) are
     * not set.  If not 0, lookup.table points to an array of
     * st_const_string_elements.
     */
    gx_color_lookup_table lookup;
    gs_cie_render_table_procs T;
} gs_cie_render_table_t;
typedef enum {
    CIE_RENDER_STATUS_BUILT,
    CIE_RENDER_STATUS_INITED,
    CIE_RENDER_STATUS_SAMPLED,
    CIE_RENDER_STATUS_COMPLETED
} cie_render_status_t;

typedef struct gx_cie_float_fixed_cache_s {
    cie_cache_floats floats;
    union if_ {
	cie_cache_fracs fracs;
	cie_cache_ints ints;
    } fixeds;
} gx_cie_float_fixed_cache;

/* The main dictionary */
struct gs_cie_render_s {
    cie_render_status_t status;
    rc_header rc;
    gs_id id;
    void *client_data;
    gs_cie_wb points;
    gs_matrix3 MatrixPQR;
    gs_range3 RangePQR;
    gs_cie_transform_proc3 TransformPQR;
    gs_matrix3 MatrixLMN;
    gs_cie_render_proc3 EncodeLMN;
    gs_range3 RangeLMN;
    gs_matrix3 MatrixABC;
    gs_cie_render_proc3 EncodeABC;
    gs_range3 RangeABC;
    gs_cie_render_table_t RenderTable;
    /* Following are computed when structure is initialized. */
    gs_range3 DomainLMN;
    gs_range3 DomainABC;
    gs_matrix3 MatrixABCEncode;
    cie_cached_value EncodeABC_base[3];
    gs_matrix3 MatrixPQR_inverse_LMN;
    gs_vector3 wdpqr, bdpqr;
    struct {
	gx_cie_vector_cache EncodeLMN[3];	/* mult. by M'ABCEncode */
	gx_cie_float_fixed_cache EncodeABC[3];
	gx_cie_scalar_cache RenderTableT[4];
	bool RenderTableT_is_identity;
    } caches;
};

/* The CRD type is public only for a type test in zcrd.c. */
extern_st(st_cie_render1);
#define public_st_cie_render1()	/* in gscrd.c */\
  gs_public_st_composite(st_cie_render1, gs_cie_render, "gs_cie_render",\
			 cie_render1_enum_ptrs, cie_render1_reloc_ptrs)

/* ------ Joint caches ------ */

/* This cache depends on both the color space and the rendering */
/* dictionary -- see above. */
typedef enum {
    CIE_JC_STATUS_BUILT,
    CIE_JC_STATUS_INITED,
    CIE_JC_STATUS_COMPLETED
} cie_joint_caches_status_t;

typedef struct gx_cie_joint_caches_s {
    /*
     * The first 4 members are the "key" in the cache.  They behave as
     * follows:
     *
     *    If id_status = COMPLETED, the cache is valid with respect to the
     *    color space and CRD identified by cspace_id and render_id.
     *
     *    If status = COMPLETED, then id_status = COMPLETED also, and for
     *    every gstate pgs that references this cache, pgs->color_space->id =
     *    cspace_id and pgs->cie_render->id = render_id; hence the cache is
     *    valid with respect to that gstate.
     *
     * This invariant is maintained because the PostScript CRD-setting
     * operators, the library's CRD-setting procedure, and the library's
     * procedures for setting CIE color spaces all unshare the joint caches
     * and set status in the new copy to something other than COMPLETED.
     *
     * The only reason for id_status is that certain client code often
     * resets the CRD and/or color space and then sets it back to its
     * original value, and we want to detect that and not invalidate the
     * caches.  If it weren't for that, setcolorspace and setcolorrendering
     * could simply invalidate the caches.
     */
    gs_id cspace_id;
    gs_id render_id;
    cie_joint_caches_status_t id_status;
    cie_joint_caches_status_t status;
    rc_header rc;
    bool skipDecodeABC;
    bool skipDecodeLMN;
    gx_cie_vector_cache DecodeLMN[3];	/* mult. by dLMN_PQR */
    gs_cie_wbsd points_sd;
    bool skipPQR;
    gx_cie_vector_cache TransformPQR[3];	/* mult. by PQR_inverse_LMN */
    bool skipEncodeLMN;
} gx_cie_joint_caches;

#define private_st_joint_caches() /* in gscie.c */\
  gs_private_st_simple(st_joint_caches, gx_cie_joint_caches,\
    "gx_cie_joint_caches")

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

typedef struct gs_for_loop_params_s {
    double init, step, limit;
} gs_for_loop_params;
void gs_cie_cache_init(P4(cie_cache_params *, gs_for_loop_params *,
			  const gs_range *, client_name_t));
void gs_cie_cache_to_fracs(P2(const cie_cache_floats *, cie_cache_fracs *));
void gs_cie_defg_complete(P1(gs_cie_defg *));
void gs_cie_def_complete(P1(gs_cie_def *));
void gs_cie_abc_complete(P1(gs_cie_abc *));
void gs_cie_a_complete(P1(gs_cie_a *));
gx_cie_joint_caches *gx_currentciecaches(P1(gs_state *));
const gs_cie_common *gs_cie_cs_common(P1(const gs_state *));
int gs_cie_cs_complete(P2(gs_state *, bool));
int gs_cie_jc_complete(P2(const gs_imager_state *, const gs_color_space *pcs));
float gs_cie_cached_value(P2(floatp, const cie_cache_floats *));

#define CIE_CLAMP_INDEX(index)\
  index = (index < 0 ? 0 :\
	   index >= gx_cie_cache_size ? gx_cie_cache_size - 1 : index)

/*
 * Compute the source and destination WhitePoint and BlackPoint for
 * the TransformPQR procedure.
 */
int gs_cie_compute_points_sd(P3(gx_cie_joint_caches *pjc,
				const gs_cie_common * pcie,
				const gs_cie_render * pcrd));

/*
 * Compute the derived values in a CRD that don't involve the cached
 * procedure values, moving the CRD from "built" to "inited" status.
 * If the CRD is already in "inited" or a later status, do nothing.
 */
int gs_cie_render_init(P1(gs_cie_render *));

/*
 * Sample the EncodeLMN, EncodeABC, and RenderTableT CRD procedures, and
 * load the caches, moving the CRD from "inited" to "sampled" status.
 * If the CRD is already in "sampled" or a later status, do nothing;
 * otherwise, if the CRD is not in "inited" status, return an error.
 */
int gs_cie_render_sample(P1(gs_cie_render *));

/*
 * Finish preparing a CRD for installation, by restricting and/or
 * transforming the cached procedure values, moving the CRD from "sampled"
 * to "completed" status.  If the CRD is already in "completed" status, do
 * nothing; otherwise, if the CRD is not in "sampled" status, return an
 * error.
 */
int gs_cie_render_complete(P1(gs_cie_render *));

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

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

/*
 * Note that these procedures take a client_data pointer as an operand. The
 * client is responsible for allocating and deleting this object; the
 * color space machinery does not take ownership of it.
 *
 * Note that these procedures set the reference count of the (large)
 * parameter structures to 1, not 0.  gs_setcolorspace will increment
 * the reference count again, so unless you want the parameter structures
 * to stay allocated permanently (or until a garbage collection),
 * you should call cs_adjust_count(pcspace, -1).  THIS IS A BUG IN THE API.
 */
extern int
    gs_cspace_build_CIEA(P3(gs_color_space ** ppcspace, void *client_data,
			    gs_memory_t * pmem)),
    gs_cspace_build_CIEABC(P3(gs_color_space ** ppcspace, void *client_data,
			      gs_memory_t * pmem)),
    gs_cspace_build_CIEDEF(P3(gs_color_space ** ppcspace, void *client_data,
			      gs_memory_t * pmem)),
    gs_cspace_build_CIEDEFG(P3(gs_color_space ** ppcspace, void *client_data,
			       gs_memory_t * pmem));

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

/*
 * Note that the accessors depend heavily on "puns" between the variants
 * of pcspace->params.{a,abc,def,defg}.
 */

/* Generic CIE based color space parameters */
#define gs_cie_RangeLMN(pcspace)  (&(pcspace)->params.a->common.RangeLMN)
#define gs_cie_DecodeLMN(pcspace) (&(pcspace)->params.a->common.DecodeLMN)
#define gs_cie_MatrixLMN(pcspace) (&(pcspace)->params.a->common.MatrixLMN)
#define gs_cie_WhitePoint(pcspace)\
  ((pcspace)->params.a->common.points.WhitePoint)
#define gs_cie_BlackPoint(pcspace)\
  ((pcspace)->params.a->common.points.BlackPoint)

/* CIEBasedA color space */
#define gs_cie_a_RangeA(pcspace)      (&(pcspace)->params.a->RangeA)
#define gs_cie_a_DecodeA(pcspace)     (&(pcspace)->params.a->DecodeA)
#define gs_cie_a_MatrixA(pcspace)     (&(pcspace)->params.a->MatrixA)
#define gs_cie_a_RangeA(pcspace)      (&(pcspace)->params.a->RangeA)

/* CIEBasedABC color space */
/* Note that these also work for CIEBasedDEF[G] spaces. */
#define gs_cie_abc_RangeABC(pcspace)    (&(pcspace)->params.abc->RangeABC)
#define gs_cie_abc_DecodeABC(pcspace)   (&(pcspace)->params.abc->DecodeABC)
#define gs_cie_abc_MatrixABC(pcspace)   (&(pcspace)->params.abc->MatrixABC)

/* CIDBasedDEF color space */
#define gs_cie_def_RangeDEF(pcspace)    (&(pcspace)->params.def->RangeDEF)
#define gs_cie_def_DecodeDEF(pcspace)   (&(pcspace)->params.def->DecodeDEF)
#define gs_cie_def_RangeHIJ(pcspace)    (&(pcspace)->params.def->RangeHIJ)

/* CIDBasedDEFG color space */
#define gs_cie_defg_RangeDEFG(pcspace)  (&(pcspace)->params.defg->RangeDEFG)
#define gs_cie_defg_DecodeDEFG(pcspace) (&(pcspace)->params.defg->DecodeDEFG)
#define gs_cie_defg_RangeHIJK(pcspace)  (&(pcspace)->params.defg->RangeHIJK)

/*
 * The following routine is provided so as to avoid explicitly exporting the
 * CIEBasedDEF[G] color lookup table structure. It is doubtful any
 * high-level clients will ever need to get this information.
 *
 * The caller must make sure the number of dimensions and strings provided
 * are the number expected given the number of components in the color space.
 * The procedure gs_color_space_num_components is available for this purpose.
 *
 * For a 3 component color space (CIEBasedDEF), ptable points to an array of
 * pdims[0] gs_const_string structures, each of which is of length
 * 3 * pdims[1] * pdims[2].
 *
 * For a 4 component color space (CIEBasedDEFG), ptable points to an array of
 * pdims[0] * pdims[1] strings, each of which is of length 
 * 3 * pdims[2] * pdims[3].
 *
 * NB: the caller is responsible for deallocating the color table data
 *     when no longer needed.  */
extern int
    gs_cie_defx_set_lookup_table(P3(gs_color_space * pcspace, int *pdims,
				    const gs_const_string * ptable));

#endif /* gscie_INCLUDED */