/* Copyright (C) 1997, 2000 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: zimage3.c,v $ $Revision: 1.3.2.1 $ */
/* 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)
};
