146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/* Close and generate callbacks.
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*
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* 1/7/93 JC
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* 20/7/93 JC
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* - eval callbacks added
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* 16/8/94 JC
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* - evalend callbacks added
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* 16/1/04 JC
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* - now always calls all callbacks, even if some fail
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Callback struct. We attach a list of callbacks to images to be invoked when
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* the image is closed. These do things like closing previous elements in a
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* chain of operations, freeing client data, etc.
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*/
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typedef struct {
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IMAGE *im; /* IMAGE we are attached to */
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int (*fn)(); /* callback function */
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void *a, *b; /* arguments to callback */
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} VCallback;
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/* Add a callback to an IMAGE. We can't use IM_NEW(), note! Freed eventually by
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* im__close(), or by im_generate(), etc. for evalend callbacks.
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*/
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static int
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add_callback( IMAGE *im, GSList **cblist, int (*fn)(), void *a, void *b )
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{
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VCallback *cbs;
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if( !(cbs = IM_NEW( NULL, VCallback )) )
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return( -1 );
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cbs->fn = fn;
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cbs->a = a;
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cbs->b = b;
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cbs->im = im;
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*cblist = g_slist_prepend( *cblist, cbs );
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return( 0 );
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}
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/* Add a close callback to an IMAGE.
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*/
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int
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im_add_close_callback( IMAGE *im, int (*fn)(), void *a, void *b )
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{
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return( add_callback( im, &im->closefns, fn, a, b ) );
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}
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/* Add an eval callback to an IMAGE.
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*/
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int
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im_add_eval_callback( IMAGE *im, int (*fn)(), void *a, void *b )
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{
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return( add_callback( im, &im->evalfns, fn, a, b ) );
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}
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/* Add an eval end callback to an IMAGE.
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*/
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int
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im_add_evalend_callback( IMAGE *im, int (*fn)(), void *a, void *b )
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{
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return( add_callback( im, &im->evalendfns, fn, a, b ) );
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}
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/* Perform a user callback.
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*/
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static void *
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call_callback( VCallback *cbs, int *result )
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{
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int res;
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if( (res = cbs->fn( cbs->a, cbs->b )) ) {
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im_error( "im__trigger_callbacks", _( "user callback "
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"failed for %s" ), cbs->im->filename );
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*result = res;
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#ifdef DEBUG_IO
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printf( "im__trigger_callbacks: user callback "
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"failed for %s\n", cbs->im->filename );
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#endif /*DEBUG_IO*/
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}
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return( NULL );
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}
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/* Perform a list of user callbacks.
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*/
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int
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im__trigger_callbacks( GSList *cblist )
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{
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int result;
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#ifdef DEBUG_IO
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printf( "im__trigger_callbacks: calling %d user callbacks ..\n",
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g_slist_length( cblist ) );
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#endif /*DEBUG_IO*/
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result = 0;
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(void) im_slist_map2( cblist,
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(VSListMap2Fn) call_callback, &result, NULL );
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return( result );
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}
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