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/* Copyright (C) 1994, 1997, 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: zht1.c,v 1.7 2005/10/11 10:04:28 leonardo Exp $ */
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/* setcolorscreen operator */
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#include "ghost.h"
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#include "memory_.h"
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#include "oper.h"
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#include "estack.h"
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#include "gsstruct.h" /* must precede igstate.h, */
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/* because of #ifdef in gsht.h */
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#include "ialloc.h"
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#include "igstate.h"
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#include "gsmatrix.h"
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#include "gxdevice.h" /* for gzht.h */
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#include "gzht.h"
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#include "gsstate.h"
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#include "iht.h"
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#include "store.h"
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/* Dummy spot function */
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private float
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spot_dummy(floatp x, floatp y)
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{
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return (x + y) / 2;
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}
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/* <red_freq> ... <gray_proc> setcolorscreen - */
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private int setcolorscreen_finish(i_ctx_t *);
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private int setcolorscreen_cleanup(i_ctx_t *);
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private int
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zsetcolorscreen(i_ctx_t *i_ctx_p)
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{
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os_ptr op = osp;
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gs_colorscreen_halftone cscreen;
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ref sprocs[4];
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gs_halftone *pht;
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gx_device_halftone *pdht;
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int i;
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int code = 0;
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int space = 0;
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gs_memory_t *mem;
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for (i = 0; i < 4; i++) {
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os_ptr op1 = op - 9 + i * 3;
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int code = zscreen_params(op1, &cscreen.screens.indexed[i]);
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if (code < 0)
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return code;
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cscreen.screens.indexed[i].spot_function = spot_dummy;
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sprocs[i] = *op1;
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space = max(space, r_space_index(op1));
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}
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mem = (gs_memory_t *)idmemory->spaces_indexed[space];
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check_estack(8); /* for sampling screens */
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rc_alloc_struct_0(pht, gs_halftone, &st_halftone,
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mem, pht = 0, "setcolorscreen(halftone)");
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rc_alloc_struct_0(pdht, gx_device_halftone, &st_device_halftone,
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mem, pdht = 0, "setcolorscreen(device halftone)");
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if (pht == 0 || pdht == 0)
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code = gs_note_error(e_VMerror);
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else {
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pht->type = ht_type_colorscreen;
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pht->params.colorscreen = cscreen;
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code = gs_sethalftone_prepare(igs, pht, pdht);
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}
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if (code >= 0) { /* Schedule the sampling of the screens. */
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es_ptr esp0 = esp; /* for backing out */
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esp += 8;
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make_mark_estack(esp - 7, es_other, setcolorscreen_cleanup);
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memcpy(esp - 6, sprocs, sizeof(ref) * 4); /* procs */
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make_istruct(esp - 2, 0, pht);
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make_istruct(esp - 1, 0, pdht);
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make_op_estack(esp, setcolorscreen_finish);
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for (i = 0; i < 4; i++) {
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/* Shuffle the indices to correspond to */
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/* the component order. */
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code = zscreen_enum_init(i_ctx_p,
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&pdht->components[(i + 1) & 3].corder,
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&pht->params.colorscreen.screens.indexed[i],
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&sprocs[i], 0, 0, space);
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if (code < 0) {
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esp = esp0;
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break;
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}
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}
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}
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if (code < 0) {
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gs_free_object(mem, pdht, "setcolorscreen(device halftone)");
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gs_free_object(mem, pht, "setcolorscreen(halftone)");
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return code;
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}
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pop(12);
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return o_push_estack;
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}
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/* Install the color screen after sampling. */
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private int
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setcolorscreen_finish(i_ctx_t *i_ctx_p)
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{
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gx_device_halftone *pdht = r_ptr(esp, gx_device_halftone);
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int code;
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pdht->order = pdht->components[0].corder;
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code = gx_ht_install(igs, r_ptr(esp - 1, gs_halftone), pdht);
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if (code < 0)
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return code;
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memcpy(&istate->screen_procs.red, esp - 5, sizeof(ref) * 4);
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make_null(&istate->halftone);
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esp -= 7;
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setcolorscreen_cleanup(i_ctx_p);
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return o_pop_estack;
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}
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/* Clean up after installing the color screen. */
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private int
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setcolorscreen_cleanup(i_ctx_t *i_ctx_p)
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{
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gs_halftone *pht = r_ptr(esp + 6, gs_halftone);
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gx_device_halftone *pdht = r_ptr(esp + 7, gx_device_halftone);
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gs_free_object(pdht->rc.memory, pdht,
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"setcolorscreen_cleanup(device halftone)");
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gs_free_object(pht->rc.memory, pht,
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"setcolorscreen_cleanup(halftone)");
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return 0;
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}
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/* ------ Initialization procedure ------ */
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const op_def zht1_op_defs[] =
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{
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{"<setcolorscreen", zsetcolorscreen},
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/* Internal operators */
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{"0%setcolorscreen_finish", setcolorscreen_finish},
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op_def_end(0)
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};
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