/* Copyright (C) 1997, 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: zimage3.c,v 1.3.6.1.2.1 2003/01/17 00:49:06 giles Exp $ */
/* LanguageLevel 3 ImageTypes (3 & 4 - masked images) */
#include "memory_.h"
#include "ghost.h"
#include "oper.h"
#include "gscspace.h"		/* for gscolor2.h */
#include "gscolor2.h"
#include "gsiparm3.h"
#include "gsiparm4.h"
#include "gxiparam.h"		/* for image enumerator */
#include "idict.h"
#include "idparam.h"
#include "igstate.h"
#include "iimage.h"
#include "iimage2.h"

/* <dict> .image3 - */
private int
zimage3(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_image3_t image;
    int interleave_type;
    ref *pDataDict;
    ref *pMaskDict;
    image_params ip_data, ip_mask;
    int ignored;
    int code, mcode;

    check_type(*op, t_dictionary);
    check_dict_read(*op);
    if ((code = dict_int_param(op, "InterleaveType", 1, 3, -1,
			       &interleave_type)) < 0
	)
	return code;
    gs_image3_t_init(&image, NULL, interleave_type);
    if (dict_find_string(op, "DataDict", &pDataDict) <= 0 ||
	dict_find_string(op, "MaskDict", &pMaskDict) <= 0
	)
	return_error(e_rangecheck);
    if ((code = pixel_image_params(i_ctx_p, pDataDict,
				   (gs_pixel_image_t *)&image, &ip_data,
				   12)) < 0 ||
	(mcode = code = data_image_params(pMaskDict, &image.MaskDict, &ip_mask, false, 1, 12)) < 0 ||
	(code = dict_int_param(pDataDict, "ImageType", 1, 1, 0, &ignored)) < 0 ||
	(code = dict_int_param(pMaskDict, "ImageType", 1, 1, 0, &ignored)) < 0
	)
	return code;
    /*
     * MaskDict must have a DataSource iff InterleaveType == 3.
     */
    if ((ip_data.MultipleDataSources && interleave_type != 3) ||
	ip_mask.MultipleDataSources ||
	mcode != (image.InterleaveType != 3)
	)
	return_error(e_rangecheck);
    if (image.InterleaveType == 3) {
	/* Insert the mask DataSource before the data DataSources. */
	memmove(&ip_data.DataSource[1], &ip_data.DataSource[0],
		(countof(ip_data.DataSource) - 1) *
		sizeof(ip_data.DataSource[0]));
	ip_data.DataSource[0] = ip_mask.DataSource[0];
    }
    return zimage_setup(i_ctx_p, (gs_pixel_image_t *)&image,
			&ip_data.DataSource[0],
			image.CombineWithColor, 1);
}

/* <dict> .image4 - */
private int
zimage4(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;
    gs_image4_t image;
    image_params ip;
    int num_components =
	gs_color_space_num_components(gs_currentcolorspace(igs));
    int colors[countof(image.MaskColor)];
    int code;
    int i;

    gs_image4_t_init(&image, NULL);
    code = pixel_image_params(i_ctx_p, op, (gs_pixel_image_t *)&image, &ip,
			      12);
    if (code < 0)
	return code;
    code = dict_int_array_check_param(op, "MaskColor", num_components * 2,
				      colors, 0, e_rangecheck);
    /* Clamp the color values to the unsigned range. */
    if (code == num_components) {
	image.MaskColor_is_range = false;
	for (i = 0; i < code; ++i)
	    image.MaskColor[i] = (colors[i] < 0 ? ~(uint)0 : colors[i]);
    }
    else if (code == num_components * 2) {
	image.MaskColor_is_range = true;
	for (i = 0; i < code; i += 2) {
	    if (colors[i+1] < 0) /* no match possible */
		image.MaskColor[i] = 1, image.MaskColor[i+1] = 0;
	    else {
		image.MaskColor[i+1] = colors[i+1];
		image.MaskColor[i] = max(colors[i], 0);
	    }
	}
    } else
	return_error(code < 0 ? code : gs_note_error(e_rangecheck));
    return zimage_setup(i_ctx_p, (gs_pixel_image_t *)&image, &ip.DataSource[0],
			image.CombineWithColor, 1);
}

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

const op_def zimage3_op_defs[] =
{
    op_def_begin_ll3(),
    {"1.image3", zimage3},
    {"1.image4", zimage4},
    op_def_end(0)
};