124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
/* @(#) Make a black uchar image of a specified size. Sometimes useful for
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* @(#) building masks.
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* @(#) IMAGE out should nhave been set by the calling program
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* @(#)
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* @(#) int
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* @(#) im_black(out, x, y, bands)
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* @(#) IMAGE *out;
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* @(#) int x, y;
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* @(#) int bands;
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* @(#)
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* @(#) Returns 0 on success and -1 on error.
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*
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* Copyright: 1990, J. Cupitt
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*
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* Author: J. Cupitt
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* Written on: 02/08/1990
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* Modified on : 16/04/1991 by N. Dessipris to work on a line by line basis
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* 15/8/94 JC
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* - adapted for partials
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* - ANSIfied
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* - memory leaks fixed!
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* 2/3/98 JC
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* - IM_ANY added
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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 <string.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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/* Generate function --- just black out the region.
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*/
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static int
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black_gen( REGION *or )
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{
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int y;
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int sz = IM_REGION_SIZEOF_LINE( or );
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int ls = IM_REGION_LSKIP( or );
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char *q = IM_REGION_ADDR( or, or->valid.left, or->valid.top );
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for( y = 0; y < or->valid.height; y++, q += ls )
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memset( q, 0, sz );
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return( 0 );
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}
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/* Make a one band black uchar image of a specified size.
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*/
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int
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im_black( IMAGE *out, int x, int y, int bands )
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{
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int type;
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/* Check parameters.
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*/
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if( x < 0 || y < 0 || bands < 0 ) {
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im_errormsg( "im_black: bad parameter" );
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return( -1 );
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}
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/* Check descriptor.
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*/
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if( im_poutcheck( out ) )
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return( -1 );
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/* Set fields.
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*/
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if( bands == 1 )
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type = IM_TYPE_B_W;
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else
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type = IM_TYPE_MULTIBAND;
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im_initdesc( out,
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x, y, bands,
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IM_BBITS_BYTE, IM_BANDFMT_UCHAR, IM_CODING_NONE, type,
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1.0, 1.0, 0, 0 );
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/* Set hints - ANY is ok with us.
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*/
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if( im_demand_hint( out, IM_ANY, NULL ) )
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return( -1 );
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/* Generate image.
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*/
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if( im_generate( out, NULL, black_gen, NULL, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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