/* 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.
*/


/* Pattern color operators and procedures for Ghostscript library */
#include "math_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsrop.h"
#include "gsstruct.h"
#include "gsutil.h"		/* for gs_next_ids */
#include "gxarith.h"
#include "gxfixed.h"
#include "gxmatrix.h"
#include "gxcoord.h"		/* for gs_concat, gx_tr'_to_fixed */
#include "gxcspace.h"		/* for gscolor2.h */
#include "gxcolor2.h"
#include "gxdcolor.h"
#include "gxdevice.h"
#include "gxdevmem.h"
#include "gxclip2.h"
#include "gspath.h"
#include "gxpath.h"
#include "gxpcolor.h"
#include "gzstate.h"
#include "gsimage.h"
#include "gsiparm4.h"
#include "stream.h"
#include "gsovrc.h"

/* GC descriptors */
public_st_pattern_template();
public_st_pattern_instance();

/* Define the Pattern color space. */
gs_private_st_composite(st_color_space_Pattern, gs_color_space,
     "gs_color_space_Pattern", cs_Pattern_enum_ptrs, cs_Pattern_reloc_ptrs);
static cs_proc_num_components(gx_num_components_Pattern);
static cs_proc_remap_color(gx_remap_Pattern);
static cs_proc_init_color(gx_init_Pattern);
static cs_proc_restrict_color(gx_restrict_Pattern);
static cs_proc_install_cspace(gx_install_Pattern);
static cs_proc_set_overprint(gx_set_overprint_Pattern);
static cs_proc_final(gx_final_Pattern);
static cs_proc_adjust_color_count(gx_adjust_color_Pattern);
static cs_proc_serialize(gx_serialize_Pattern);
const gs_color_space_type gs_color_space_type_Pattern = {
    gs_color_space_index_Pattern, false, false,
    &st_color_space_Pattern, gx_num_components_Pattern,
    gx_init_Pattern, gx_restrict_Pattern,
    gx_no_concrete_space,
    gx_no_concretize_color, NULL,
    gx_remap_Pattern, gx_install_Pattern,
    gx_set_overprint_Pattern,
    gx_final_Pattern, gx_adjust_color_Pattern,
    gx_serialize_Pattern,
    gx_cspace_no_linear, gx_polarity_unknown
};

/* Initialize a generic pattern template. */
void
gs_pattern_common_init(gs_pattern_template_t * ppat,
                       const gs_pattern_type_t *type)
{
    ppat->type = type;
    ppat->PatternType = type->PatternType;
    uid_set_invalid(&ppat->uid);
}

/* Generic makepattern */
int
gs_make_pattern(gs_client_color * pcc, const gs_pattern_template_t * pcp,
                const gs_matrix * pmat, gs_gstate * pgs, gs_memory_t * mem)
{
    return pcp->type->procs.make_pattern(pcc, pcp, pmat, pgs, mem);
}

/*
 * Do the generic work for makepattern: allocate the instance and the
 * saved graphics state, and fill in the common members.
 */
int
gs_make_pattern_common(gs_client_color *pcc,
                       const gs_pattern_template_t *ptemp,
                       const gs_matrix *pmat, gs_gstate *pgs, gs_memory_t *mem,
                       gs_memory_type_ptr_t pstype)
{
    gs_pattern_instance_t *pinst;
    gs_gstate *saved;
    int code = 0;

    if (mem == 0)
        mem = gs_gstate_memory(pgs);
    rc_alloc_struct_1(pinst, gs_pattern_instance_t, pstype, mem,
                      return_error(gs_error_VMerror),
                      "gs_make_pattern_common");
    pinst->rc.free = rc_free_pattern_instance;
    pinst->type = ptemp->type;
    saved = gs_gstate_copy(pgs, mem);
    if (saved == 0) {
        gs_free_object(mem, pinst, "gs_make_pattern_common");
        return_error(gs_error_VMerror);
    }
    gs_concat(saved, pmat);
    code = gs_newpath(saved);
    pinst->saved = saved;
    pinst->client_data = NULL;	/* for GC */
    pinst->notify_free = NULL;  /* No custom free calllback initially */
    pcc->pattern = pinst;
    pcc->pattern->pattern_id = gs_next_ids(mem, 1);
    return code;
}

/* Free the saved gstate when freeing a Pattern instance. */
void
rc_free_pattern_instance(gs_memory_t * mem, void *pinst_void,
                         client_name_t cname)
{
    gs_pattern_instance_t *pinst = pinst_void;

    if (pinst->notify_free != NULL)
        (*pinst->notify_free) ((gs_memory_t *)mem, pinst);

    gs_gstate_free(pinst->saved);
    rc_free_struct_only(mem, pinst_void, cname);
}

/* setpattern */
int
gs_setpattern(gs_gstate * pgs, const gs_client_color * pcc)
{
    int code = gs_setpatternspace(pgs);

    if (code < 0)
        return code;
    return gs_setcolor(pgs, pcc);
}

/* setpatternspace */
/* This does all the work of setpattern except for the final setcolor. */
int
gs_setpatternspace(gs_gstate * pgs)
{
    int code = 0;
    gs_color_space *ccs_old;

    if (pgs->in_cachedevice)
        return_error(gs_error_undefined);
    ccs_old = gs_currentcolorspace_inline(pgs);
    if (ccs_old->type->index != gs_color_space_index_Pattern) {
        gs_color_space *pcs;

        pcs = gs_cspace_alloc(pgs->memory, &gs_color_space_type_Pattern);
        if (pcs == NULL)
            return_error(gs_error_VMerror);
        /* reference to base space shifts from pgs to pcs with no net change */
        pcs->base_space = ccs_old;
        pcs->params.pattern.has_base_space = true;
        pgs->color[0].color_space = pcs;
        cs_full_init_color(pgs->color[0].ccolor, pcs);
        gx_unset_dev_color(pgs);
    }
    return code;
}

/*
 * Adjust the reference count of a pattern. This is intended to support
 * applications (such as PCL) which maintain client colors outside of the
 * graphic state. Since the pattern instance structure is opaque to these
 * applications, they need some way to release or retain the instances as
 * needed.
 */
void
gs_pattern_reference(gs_client_color * pcc, int delta)
{
    if (pcc->pattern != 0)
        rc_adjust(pcc->pattern, delta, "gs_pattern_reference");
}

/* getpattern */
/* This is only intended for the benefit of pattern PaintProcs. */
const gs_pattern_template_t *
gs_get_pattern(const gs_client_color * pcc)
{
    const gs_pattern_instance_t *pinst = pcc->pattern;

    return (pinst == 0 ? 0 : pinst->type->procs.get_pattern(pinst));
}

/*
 * Get the number of components in a Pattern color.
 * For backward compatibility, and to distinguish Pattern color spaces
 * from all others, we negate the result.
 */
static int
gx_num_components_Pattern(const gs_color_space * pcs)
{
    return
        (pcs->params.pattern.has_base_space ?
         -1 - cs_num_components(pcs->base_space) :
         -1 /* Pattern dictionary only */ );
}

/* Remap a Pattern color. */
static int
gx_remap_Pattern(const gs_client_color * pc, const gs_color_space * pcs,
                 gx_device_color * pdc, const gs_gstate * pgs,
                 gx_device * dev, gs_color_select_t select)
{
    if (pc->pattern == 0) {
        pdc->ccolor_valid = false;
        pdc->ccolor.pattern = 0; /* for GC */
        color_set_null_pattern(pdc);
        return 0;
    }
    return
        pc->pattern->type->procs.remap_color(pc, pcs, pdc, pgs, dev, select);
}

/* Initialize a Pattern color. */
static void
gx_init_Pattern(gs_client_color * pcc, const gs_color_space * pcs)
{
    if (pcs->params.pattern.has_base_space) {
        const gs_color_space *pbcs = pcs->base_space;

        cs_init_color(pcc, pbcs);
    }
    /*pcc->pattern = 0; *//* cs_full_init_color handles this */
}

/* Force a Pattern color into legal range. */
/* Note that if the pattern is uncolored (PaintType = 2), */
/* the color space must have a base space: we check this here only */
/* to prevent accessing uninitialized data, but if there is no base space, */
/* it is an error that we count on being detected elsewhere. */
static void
gx_restrict_Pattern(gs_client_color * pcc, const gs_color_space * pcs)
{
    /* We need a special check for the null pattern. */
    if (pcc->pattern &&
        pcc->pattern->type->procs.uses_base_space(gs_get_pattern(pcc)) &&
        pcs->params.pattern.has_base_space
        ) {
        const gs_color_space *pbcs = pcs->base_space;

        (*pbcs->type->restrict_color) (pcc, pbcs);
    }
}

/* Install a Pattern color space. */
static int
gx_install_Pattern(gs_color_space * pcs, gs_gstate * pgs)
{
    if (!pcs->params.pattern.has_base_space)
        return 0;
    return (pcs->base_space->type->install_cspace)(pcs->base_space, pgs);
}

/*
 * Set the overprint compositor for a Pattern color space. This does nothing;
 * for patterns the overprint compositor is set at set_device_color time.
 * However, it is possible that this pattern color has nothing to do with what
 * is about to happen (e.g. an image enumeration and fill).  Hence, we should
 * at least disable the overprint compositor if overprint is off.  If overprint
 * is not off, it is not clear how we should proceed, as the color space is
 * a factor in that set up and here the color space is a pattern.
*/
static int
gx_set_overprint_Pattern(const gs_color_space * pcs, gs_gstate * pgs)
{
    gs_overprint_params_t params = { 0 };

    if (!pgs->overprint) {
        params.retain_any_comps = false;
        params.effective_opm = pgs->color[0].effective_opm = 0;
        return gs_gstate_update_overprint(pgs, &params);
    }
    return 0;
}

/* Adjust the reference counts for Pattern color spaces or colors. */
static void
gx_final_Pattern(gs_color_space * pcs)
{
    /* {csrc} really do nothing? */
}

static void
gx_adjust_color_Pattern(const gs_client_color * pcc,
                        const gs_color_space * pcs, int delta)
{
    gs_pattern_instance_t *pinst = pcc->pattern;

    rc_adjust_only(pinst, delta, "gx_adjust_color_Pattern");
    if (pcs && pcs->base_space && pcs->params.pattern.has_base_space)
        (pcs->base_space->type->adjust_color_count)
            (pcc, pcs->base_space, delta);
}

/* GC procedures */

static
ENUM_PTRS_BEGIN_PROC(cs_Pattern_enum_ptrs)
{
    return 0;
    /* {csrc} may change to st_base_color_space */
}
ENUM_PTRS_END_PROC
static RELOC_PTRS_BEGIN(cs_Pattern_reloc_ptrs)
{
    return;
}
RELOC_PTRS_END

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

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

    if (code < 0)
        return code;
    code = sputs(s, (const byte *)&p->has_base_space, sizeof(p->has_base_space), &n);
    if (code < 0)
        return code;
    if (!p->has_base_space)
        return 0;
    return cs_serialize(pcs->base_space, s);
}