/* Copyright (C) 1993, 2000 artofcode LLC.  All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License along
  with this program; if not, write to the Free Software Foundation, Inc.,
  59 Temple Place, Suite 330, Boston, MA, 02111-1307.

*/

/*$Id: gspcolor.c,v 1.4.6.1.2.1 2003/01/17 00:49:03 giles Exp $ */
/* 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"

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

/* Define the Pattern color space. */
gs_private_st_composite(st_color_space_Pattern, gs_paint_color_space,
     "gs_color_space_Pattern", cs_Pattern_enum_ptrs, cs_Pattern_reloc_ptrs);
private cs_proc_num_components(gx_num_components_Pattern);
private cs_proc_base_space(gx_base_space_Pattern);
private cs_proc_remap_color(gx_remap_Pattern);
private cs_proc_init_color(gx_init_Pattern);
private cs_proc_restrict_color(gx_restrict_Pattern);
private cs_proc_install_cspace(gx_install_Pattern);
private cs_proc_adjust_cspace_count(gx_adjust_cspace_Pattern);
private cs_proc_adjust_color_count(gx_adjust_color_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_base_space_Pattern, gx_cspace_not_equal,
    gx_init_Pattern, gx_restrict_Pattern,
    gx_no_concrete_space,
    gx_no_concretize_color, NULL,
    gx_remap_Pattern, gx_install_Pattern,
    gx_adjust_cspace_Pattern, gx_adjust_color_Pattern
};

/* 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);
    ppat->client_data = 0;	/* for GC */
}

/* Generic makepattern */
int
gs_make_pattern(gs_client_color * pcc, const gs_pattern_template_t * pcp,
		const gs_matrix * pmat, gs_state * 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_state *pgs, gs_memory_t *mem,
		       gs_memory_type_ptr_t pstype)
{
    gs_pattern_instance_t *pinst;
    gs_state *saved;

    if (mem == 0)
	mem = gs_state_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_state_copy(pgs, mem);
    if (saved == 0) {
	gs_free_object(mem, pinst, "gs_make_pattern_common");
	return_error(gs_error_VMerror);
    }
    gs_concat(saved, pmat);
    gs_newpath(saved);
    pinst->saved = saved;
    pcc->pattern = pinst;
    return 0;
}

/* 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;

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

/* setpattern */
int
gs_setpattern(gs_state * 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_state * pgs)
{
    int code = 0;

    if (pgs->in_cachedevice)
	return_error(gs_error_undefined);
    if (pgs->color_space->type->index != gs_color_space_index_Pattern) {
	gs_color_space cs;

	gs_cspace_init(&cs, &gs_color_space_type_Pattern, NULL);
	/**************** base_space SETTING IS WRONG ****************/
	cs.params.pattern.base_space =
	    *(gs_paint_color_space *) pgs->color_space;
	cs.params.pattern.has_base_space = true;
	*pgs->color_space = cs;
	/* Don't change orig_base_cspace_index. */
	pgs->orig_cspace_index = gs_color_space_index_Pattern;
	cs_full_init_color(pgs->ccolor, &cs);
	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.
 */
private int
gx_num_components_Pattern(const gs_color_space * pcs)
{
    return
	(pcs->params.pattern.has_base_space ?
	 -1 - cs_num_components((const gs_color_space *)
				&(pcs->params.pattern.base_space)) :
	 -1 /* Pattern dictionary only */ );
}

/* Get the base space of a Pattern color space. */
private const gs_color_space *
gx_base_space_Pattern(const gs_color_space * pcs)
{
    return
	(pcs->params.pattern.has_base_space ?
	 (const gs_color_space *)&(pcs->params.pattern.base_space) :
	 NULL);
}

/* Remap a Pattern color. */
private int
gx_remap_Pattern(const gs_client_color * pc, const gs_color_space * pcs,
		 gx_device_color * pdc, const gs_imager_state * pis,
		 gx_device * dev, gs_color_select_t select)
{
    if (pc->pattern == 0) {
	color_set_null_pattern(pdc);
	return 0;
    }
    return
	pc->pattern->type->procs.remap_color(pc, pcs, pdc, pis, dev, select);
}

/* Initialize a Pattern color. */
private 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 =
	(const gs_color_space *)&pcs->params.pattern.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. */
private 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 =
	    (const gs_color_space *)&pcs->params.pattern.base_space;

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

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

/* Adjust the reference counts for Pattern color spaces or colors. */
private void
gx_adjust_cspace_Pattern(const gs_color_space * pcs, int delta)
{
    if (pcs->params.pattern.has_base_space)
	(*pcs->params.pattern.base_space.type->adjust_cspace_count)
	    ((const gs_color_space *)&pcs->params.pattern.base_space, delta);
}

private 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->params.pattern.has_base_space)
	(*pcs->params.pattern.base_space.type->adjust_color_count)
	    (pcc, (const gs_color_space *)&pcs->params.pattern.base_space,
	     delta);
}

/* GC procedures */

private 
ENUM_PTRS_BEGIN_PROC(cs_Pattern_enum_ptrs)
{
    EV_CONST gs_color_space *const pcs = vptr;

    if (!pcs->params.pattern.has_base_space)
	return 0;
    return ENUM_USING(*pcs->params.pattern.base_space.type->stype,
		      &pcs->params.pattern.base_space,
		      sizeof(pcs->params.pattern.base_space), index);
}
ENUM_PTRS_END_PROC
private RELOC_PTRS_WITH(cs_Pattern_reloc_ptrs, gs_color_space *pcs)
{
    if (!pcs->params.pattern.has_base_space)
	return;
    RELOC_USING(*pcs->params.pattern.base_space.type->stype,
		&pcs->params.pattern.base_space,
		sizeof(gs_paint_color_space));
}
RELOC_PTRS_END