/* Copyright (C) 1994, 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: zpcolor.c,v 1.3.6.1.2.1 2003/01/17 00:49:06 giles Exp $ */
/* Pattern color */
#include "ghost.h"
#include "oper.h"
#include "gscolor.h"
#include "gsmatrix.h"
#include "gsstruct.h"
#include "gxcspace.h"
#include "gxfixed.h"		/* for gxcolor2.h */
#include "gxcolor2.h"
#include "gxdcolor.h"		/* for gxpcolor.h */
#include "gxdevice.h"
#include "gxdevmem.h"		/* for gxpcolor.h */
#include "gxpcolor.h"
#include "estack.h"
#include "ialloc.h"
#include "icremap.h"
#include "istruct.h"
#include "idict.h"
#include "idparam.h"
#include "igstate.h"
#include "ipcolor.h"
#include "store.h"

/* Imported from gspcolor.c */
extern const gs_color_space_type gs_color_space_type_Pattern;

/* Forward references */
private int zPaintProc(P2(const gs_client_color *, gs_state *));
private int pattern_paint_prepare(P1(i_ctx_t *));
private int pattern_paint_finish(P1(i_ctx_t *));

/* GC descriptors */
private_st_int_pattern();

/* Initialize the Pattern cache. */
private int
zpcolor_init(i_ctx_t *i_ctx_p)
{
    gstate_set_pattern_cache(igs,
			     gx_pattern_alloc_cache(imemory_system,
					       gx_pat_cache_default_tiles(),
					      gx_pat_cache_default_bits()));
    return 0;
}

/* Create an interpreter pattern structure. */
int
int_pattern_alloc(int_pattern **ppdata, const ref *op, gs_memory_t *mem)
{
    int_pattern *pdata =
	gs_alloc_struct(mem, int_pattern, &st_int_pattern, "int_pattern");

    if (pdata == 0)
	return_error(e_VMerror);
    pdata->dict = *op;
    *ppdata = pdata;
    return 0;
}

/* <pattern> <matrix> .buildpattern1 <pattern> <instance> */
private int
zbuildpattern1(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    os_ptr op1 = op - 1;
    int code;
    gs_matrix mat;
    float BBox[4];
    gs_client_pattern template;
    int_pattern *pdata;
    gs_client_color cc_instance;
    ref *pPaintProc;

    check_type(*op1, t_dictionary);
    check_dict_read(*op1);
    gs_pattern1_init(&template);
    if ((code = read_matrix(op, &mat)) < 0 ||
	(code = dict_uid_param(op1, &template.uid, 1, imemory, i_ctx_p)) != 1 ||
	(code = dict_int_param(op1, "PaintType", 1, 2, 0, &template.PaintType)) < 0 ||
	(code = dict_int_param(op1, "TilingType", 1, 3, 0, &template.TilingType)) < 0 ||
	(code = dict_floats_param(op1, "BBox", 4, BBox, NULL)) < 0 ||
	(code = dict_float_param(op1, "XStep", 0.0, &template.XStep)) != 0 ||
	(code = dict_float_param(op1, "YStep", 0.0, &template.YStep)) != 0 ||
	(code = dict_find_string(op1, "PaintProc", &pPaintProc)) <= 0
	)
	return_error((code < 0 ? code : e_rangecheck));
    check_proc(*pPaintProc);
    template.BBox.p.x = BBox[0];
    template.BBox.p.y = BBox[1];
    template.BBox.q.x = BBox[2];
    template.BBox.q.y = BBox[3];
    template.PaintProc = zPaintProc;
    code = int_pattern_alloc(&pdata, op1, imemory);
    if (code < 0)
	return code;
    template.client_data = pdata;
    code = gs_makepattern(&cc_instance, &template, &mat, igs, imemory);
    if (code < 0) {
	ifree_object(pdata, "int_pattern");
	return code;
    }
    make_istruct(op, a_readonly, cc_instance.pattern);
    return code;
}

/* <array> .setpatternspace - */
/* In the case of uncolored patterns, the current color space is */
/* the base space for the pattern space. */
private int
zsetpatternspace(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_color_space cs;
    uint edepth = ref_stack_count(&e_stack);
    int code;

    check_read_type(*op, t_array);
    switch (r_size(op)) {
	case 1:		/* no base space */
	    cs.params.pattern.has_base_space = false;
	    break;
	default:
	    return_error(e_rangecheck);
	case 2:
	    cs = *gs_currentcolorspace(igs);
	    if (cs_num_components(&cs) < 0)	/* i.e., Pattern space */
		return_error(e_rangecheck);
	    /* We can't count on C compilers to recognize the aliasing */
	    /* that would be involved in a direct assignment, so.... */
	    {
		gs_paint_color_space cs_paint;

		cs_paint = *(gs_paint_color_space *) & cs;
		cs.params.pattern.base_space = cs_paint;
	    }
	    cs.params.pattern.has_base_space = true;
    }
    gs_cspace_init(&cs, &gs_color_space_type_Pattern, NULL);
    code = gs_setcolorspace(igs, &cs);
    if (code < 0) {
	ref_stack_pop_to(&e_stack, edepth);
	return code;
    }
    pop(1);
    return (ref_stack_count(&e_stack) == edepth ? 0 : o_push_estack);	/* installation will load the caches */
}

/* ------ Initialization procedure ------ */

const op_def zpcolor_l2_op_defs[] =
{
    op_def_begin_level2(),
    {"2.buildpattern1", zbuildpattern1},
    {"1.setpatternspace", zsetpatternspace},
		/* Internal operators */
    {"0%pattern_paint_prepare", pattern_paint_prepare},
    {"0%pattern_paint_finish", pattern_paint_finish},
    op_def_end(zpcolor_init)
};

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

/* Render the pattern by calling the PaintProc. */
private int pattern_paint_cleanup(P1(i_ctx_t *));
private int
zPaintProc(const gs_client_color * pcc, gs_state * pgs)
{
    /* Just schedule a call on the real PaintProc. */
    r_ptr(&gs_int_gstate(pgs)->remap_color_info,
	  int_remap_color_info_t)->proc =
	pattern_paint_prepare;
    return_error(e_RemapColor);
}
/* Prepare to run the PaintProc. */
private int
pattern_paint_prepare(i_ctx_t *i_ctx_p)
{
    gs_state *pgs = igs;
    gs_pattern1_instance_t *pinst =
	(gs_pattern1_instance_t *)gs_currentcolor(pgs)->pattern;
    ref *pdict = &((int_pattern *) pinst->template.client_data)->dict;
    gx_device_pattern_accum *pdev;
    int code;
    ref *ppp;

    check_estack(5);
    pdev = gx_pattern_accum_alloc(imemory, "pattern_paint_prepare");
    if (pdev == 0)
	return_error(e_VMerror);
    pdev->instance = pinst;
    pdev->bitmap_memory = gstate_pattern_cache(pgs)->memory;
    code = (*dev_proc(pdev, open_device)) ((gx_device *) pdev);
    if (code < 0) {
	ifree_object(pdev, "pattern_paint_prepare");
	return code;
    }
    code = gs_gsave(pgs);
    if (code < 0)
	return code;
    code = gs_setgstate(pgs, pinst->saved);
    if (code < 0) {
	gs_grestore(pgs);
	return code;
    }
    gx_set_device_only(pgs, (gx_device *) pdev);
    push_mark_estack(es_other, pattern_paint_cleanup);
    ++esp;
    make_istruct(esp, 0, pdev);
    push_op_estack(pattern_paint_finish);
    dict_find_string(pdict, "PaintProc", &ppp);		/* can't fail */
    *++esp = *ppp;
    *++esp = *pdict;		/* (push on ostack) */
    return o_push_estack;
}
/* Save the rendered pattern. */
private int
pattern_paint_finish(i_ctx_t *i_ctx_p)
{
    gx_device_pattern_accum *pdev = r_ptr(esp, gx_device_pattern_accum);
    gx_color_tile *ctile;
    int code = gx_pattern_cache_add_entry((gs_imager_state *)igs,
					  pdev, &ctile);

    if (code < 0)
	return code;
    esp -= 2;
    pattern_paint_cleanup(i_ctx_p);
    return o_pop_estack;
}
/* Clean up after rendering a pattern.  Note that iff the rendering */
/* succeeded, closing the accumulator won't free the bits. */
private int
pattern_paint_cleanup(i_ctx_t *i_ctx_p)
{
    gx_device_pattern_accum *const pdev =
	r_ptr(esp + 2, gx_device_pattern_accum);

    /* grestore will free the device, so close it first. */
    (*dev_proc(pdev, close_device)) ((gx_device *) pdev);
    return gs_grestore(igs);
}