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/* Copyright (C) 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gscssub.c,v 1.5 2002/02/21 22:24:52 giles Exp $ */
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/* Color space substitution "operators" */
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#include "gx.h"
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#include "gserrors.h"
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#include "gscssub.h"
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#include "gxcspace.h" /* for st_color_space */
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#include "gxdevcli.h"
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#include "gzstate.h"
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/* .setsubstitutecolorspace */
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/* Note that, to support PDF, ICCBased color spaces may be used to substitute
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* for the Device* color spaces (previously, only CIEBased color spaces could
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* be used for this purpose). */
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int
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gs_setsubstitutecolorspace(gs_state *pgs, gs_color_space_index csi,
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const gs_color_space *pcs)
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{
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int index = (int)csi;
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static const uint masks[3] = {
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(1 << gs_color_space_index_DeviceGray) |
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(1 << gs_color_space_index_CIEA),
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(1 << gs_color_space_index_DeviceRGB) |
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(1 << gs_color_space_index_CIEABC) |
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(1 << gs_color_space_index_CIEDEF),
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(1 << gs_color_space_index_DeviceCMYK) |
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(1 << gs_color_space_index_CIEDEFG)
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};
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const gs_color_space *pcs_old;
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if (index < 0 || index > 2)
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return_error(gs_error_rangecheck);
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if (pcs) {
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if (gs_color_space_get_index(pcs) == gs_color_space_index_CIEICC) {
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static const byte dev_ncomps[3] = {1, 3, 4};
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if (dev_ncomps[index] != cs_num_components(pcs))
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return_error(gs_error_rangecheck);
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} else if (!masks[index] && (1 << gs_color_space_get_index(pcs)))
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return_error(gs_error_rangecheck);
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}
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pcs_old = pgs->device_color_spaces.indexed[index];
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if (pcs_old == 0) {
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gs_color_space *pcs_new;
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if (pcs == 0 || gs_color_space_get_index(pcs) == csi)
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return 0;
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pcs_new = gs_alloc_struct(pgs->memory, gs_color_space, &st_color_space,
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"gs_setsubstitutecolorspace");
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if (pcs_new == 0)
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return_error(gs_error_VMerror);
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gs_cspace_init_from(pcs_new, pcs);
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pgs->device_color_spaces.indexed[index] = pcs_new;
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} else {
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gs_cspace_assign(pgs->device_color_spaces.indexed[index],
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(pcs ? pcs :
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pgs->shared->device_color_spaces.indexed[index]));
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}
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return 0;
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}
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/* Possibly-substituted color space accessors. */
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const gs_color_space *
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gs_current_DeviceGray_space(const gs_state *pgs)
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{
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const gs_color_space *pcs;
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return (!pgs->device->UseCIEColor ||
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(pcs = pgs->device_color_spaces.named.Gray) == 0 ?
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pgs->shared->device_color_spaces.named.Gray : pcs);
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}
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const gs_color_space *
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gs_current_DeviceRGB_space(const gs_state *pgs)
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{
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const gs_color_space *pcs;
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return (!pgs->device->UseCIEColor ||
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(pcs = pgs->device_color_spaces.named.RGB) == 0 ?
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pgs->shared->device_color_spaces.named.RGB : pcs);
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}
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const gs_color_space *
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gs_current_DeviceCMYK_space(const gs_state *pgs)
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{
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const gs_color_space *pcs;
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return (!pgs->device->UseCIEColor ||
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(pcs = pgs->device_color_spaces.named.CMYK) == 0 ?
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pgs->shared->device_color_spaces.named.CMYK : pcs);
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}
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/* .currentsubstitutecolorspace */
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const gs_color_space *
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gs_currentsubstitutecolorspace(const gs_state *pgs, gs_color_space_index csi)
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{
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switch (csi) {
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case gs_color_space_index_DeviceGray:
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return gs_current_DeviceGray_space(pgs);
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case gs_color_space_index_DeviceRGB:
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return gs_current_DeviceRGB_space(pgs);
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case gs_color_space_index_DeviceCMYK:
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return gs_current_DeviceCMYK_space(pgs);
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default:
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return 0;
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}
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}
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