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/*
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Copyright (C) 2001 artofcode LLC.
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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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Author: Raph Levien <raph@artofcode.com>
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*/
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/* $Id: gsdfilt.c,v 1.9 2004/03/11 14:50:50 igor Exp $ */
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/* Functions for managing the device filter stack */
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#include "ctype_.h"
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#include "memory_.h" /* for memchr, memcpy */
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#include "string_.h"
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#include "gx.h"
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#include "gp.h"
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#include "gscdefs.h" /* for gs_lib_device_list */
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#include "gserrors.h"
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#include "gsfname.h"
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#include "gsstruct.h"
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#include "gspath.h" /* gs_initclip prototype */
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#include "gspaint.h" /* gs_erasepage prototype */
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#include "gsmatrix.h" /* for gscoord.h */
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#include "gscoord.h" /* for gs_initmatrix */
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#include "gzstate.h"
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#include "gxcmap.h"
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#include "gxdevice.h"
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#include "gxdevmem.h"
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#include "gxiodev.h"
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#include "gsdfilt.h"
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gs_private_st_ptrs3(st_gs_device_filter_stack, gs_device_filter_stack_t,
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"gs_device_filter_stack",
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gs_device_filter_stack_enum_ptrs,
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gs_device_filter_stack_reloc_ptrs,
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next, df, next_device);
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gs_public_st_simple(st_gs_device_filter, gs_device_filter_t,
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"gs_device_filter");
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int
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gs_push_device_filter(gs_memory_t *mem, gs_state *pgs, gs_device_filter_t *df)
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{
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gs_device_filter_stack_t *dfs;
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gx_device *new_dev = NULL;
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int code;
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dfs = gs_alloc_struct(mem, gs_device_filter_stack_t,
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&st_gs_device_filter_stack, "gs_push_device_filter");
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if (dfs == NULL)
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return_error(gs_error_VMerror);
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rc_increment(pgs->device);
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dfs->next_device = pgs->device;
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code = df->push(df, mem, pgs, &new_dev, pgs->device);
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if (code < 0) {
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gs_free_object(mem, dfs, "gs_push_device_filter");
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return code;
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}
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dfs->next = pgs->dfilter_stack;
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pgs->dfilter_stack = dfs;
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dfs->df = df;
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rc_init(dfs, mem, 1);
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gs_setdevice_no_init(pgs, new_dev);
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rc_decrement_only(new_dev, "gs_push_device_filter");
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return code;
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}
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int
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gs_pop_device_filter(gs_memory_t *mem, gs_state *pgs)
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{
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gs_device_filter_stack_t *dfs_tos = pgs->dfilter_stack;
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gx_device *tos_device = pgs->device;
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gs_device_filter_t *df;
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int code;
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if (dfs_tos == NULL)
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return_error(gs_error_rangecheck);
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df = dfs_tos->df;
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pgs->dfilter_stack = dfs_tos->next;
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code = df->prepop(df, mem, pgs, tos_device);
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rc_increment(tos_device);
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gs_setdevice_no_init(pgs, dfs_tos->next_device);
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rc_decrement_only(dfs_tos->next_device, "gs_pop_device_filter");
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dfs_tos->df = NULL;
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rc_decrement_only(dfs_tos, "gs_pop_device_filter");
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code = df->postpop(df, mem, pgs, tos_device);
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rc_decrement_only(tos_device, "gs_pop_device_filter");
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return code;
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}
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int
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gs_clear_device_filters(gs_memory_t *mem, gs_state *pgs)
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{
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int code;
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while (pgs->dfilter_stack != NULL) {
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if ((code = gs_pop_device_filter(mem, pgs)) < 0)
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return code;
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}
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return 0;
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}
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