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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.h,v 1.9 2003/08/15 22:32:02 raph Exp $ */
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#ifndef gsdfilt_INCLUDED
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# define gsdfilt_INCLUDED
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/* The device filter stack lives in the gs_state structure. It represents
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a chained sequence of devices that filter device requests, each forwarding
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to its target. The last such target is the physical device as set by
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setpagedevice.
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There is a "shadow" gs_device_filter_stack_s object for each device in
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the chain. The stack management uses these objects to keep track of the
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chain.
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*/
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#ifndef gs_device_filter_stack_DEFINED
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# define gs_device_filter_stack_DEFINED
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typedef struct gs_device_filter_stack_s gs_device_filter_stack_t;
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#endif
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#ifndef gs_device_filter_DEFINED
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# define gs_device_filter_DEFINED
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typedef struct gs_device_filter_s gs_device_filter_t;
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#endif
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struct gs_device_filter_s {
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int (*push)(gs_device_filter_t *self, gs_memory_t *mem, gs_state *pgs,
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gx_device **pdev, gx_device *target);
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int (*prepop)(gs_device_filter_t *self, gs_memory_t *mem, gs_state *pgs,
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gx_device *dev);
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int (*postpop)(gs_device_filter_t *self, gs_memory_t *mem, gs_state *pgs,
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gx_device *dev);
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};
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extern_st(st_gs_device_filter);
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/**
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* gs_push_device_filter: Push a device filter.
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* @mem: Memory for creating device filter.
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* @pgs: Graphics state.
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* @df: The device filter.
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*
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* Pushes a device filter, thereby becoming the first in the chain.
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*
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* Return value: 0 on success, or error code.
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**/
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int 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_pop_device_filter: Pop a device filter.
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* @mem: Memory in which device filter was created, for freeing.
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* @pgs: Graphics state.
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*
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* Removes the topmost device filter (ie, first filter in the chain)
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* from the graphics state's device filter stack.
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*
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* Return value: 0 on success, or error code.
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**/
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int gs_pop_device_filter(gs_memory_t *mem, gs_state *pgs);
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/**
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* gs_clear_device_filters: Clear device filters from a graphics state.
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* @mem: Memory in which device filters were created, for freeing.
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* @pgs: Graphics state.
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*
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* Clears all device filters from the given graphics state.
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*
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* Return value: 0 on success, or error code.
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**/
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int gs_clear_device_filters(gs_memory_t *mem, gs_state *pgs);
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#endif /* gsdfilt_INCLUDED */
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