File: zimage3.c

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/* Copyright (C) 2001-2006 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 that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: zimage3.c 9043 2008-08-28 22:48:19Z giles $ */
/* 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 "ialloc.h"

/* <dict> .image3 - */
static 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, false, gs_currentcolorspace(igs))) < 0 ||
	(mcode = code = data_image_params(imemory, pMaskDict, &image.MaskDict,
				   &ip_mask, false, 1, 12, false)) < 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 - */
static 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, false, gs_currentcolorspace(igs));
    if (code < 0)
	return code;
    code = dict_int_array_check_param(imemory, 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)
};