134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
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/* @(#) creates a pattern showing the similtaneous constrast effect
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* @(#)
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* @(#) Usage: int im_simcontr(image, xs, ys)
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* @(#) IMAGE *image;
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* @(#) int xs, ys;
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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* @(#)
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 19/07/1991
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* Modified on:
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* 22/7/93 JC
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* - externs removed
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* - im_outcheck() 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 <stdlib.h>
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#include <math.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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int
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im_simcontr( IMAGE *image, int xs, int ys )
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{
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int x, y;
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unsigned char *line1, *line2, *cpline;
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/* Check input args */
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if( im_outcheck( image ) )
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return( -1 );
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/* Set now image properly */
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im_initdesc(image, xs, ys, 1, IM_BBITS_BYTE, IM_BANDFMT_UCHAR,
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IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 );
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/* Set up image checking whether the output is a buffer or a file */
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if (im_setupout( image ) == -1 )
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{ im_errormsg("im_simcontr: im_setupout failed"); return(-1); }
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/* Create data */
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line1 = (unsigned char *)calloc((unsigned)xs, sizeof(char));
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line2 = (unsigned char *)calloc((unsigned)xs, sizeof(char));
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if ( (line1 == NULL) || (line2 == NULL) )
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{ im_errormsg("im_simcontr: calloc failed"); return(-1); }
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cpline = line1;
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for (x=0; x<xs; x++)
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*cpline++ = (PEL)255;
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cpline = line1;
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for (x=0; x<xs/2; x++)
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*cpline++ = (PEL)0;
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cpline = line2;
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for (x=0; x<xs; x++)
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*cpline++ = (PEL)255;
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cpline = line2;
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for (x=0; x<xs/8; x++)
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*cpline++ = (PEL)0;
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for (x=0; x<xs/4; x++)
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*cpline++ = (PEL)128;
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for (x=0; x<xs/8; x++)
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*cpline++ = (PEL)0;
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for (x=0; x<xs/8; x++)
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*cpline++ = (PEL)255;
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for (x=0; x<xs/4; x++)
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*cpline++ = (PEL)128;
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for (y=0; y<ys/4; y++)
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{
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if ( im_writeline( y, image, (PEL *)line1 ) == -1 )
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{
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free ( (char *)line1 ); free ( (char *)line2 );
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return( -1 );
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}
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}
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for (y=ys/4; y<(ys/4+ys/2); y++)
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{
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if ( im_writeline( y, image, (PEL *)line2 ) == -1 )
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{
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free ( (char *)line1 ); free ( (char *)line2 );
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return( -1 );
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}
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}
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for (y=(ys/4 + ys/2); y<ys; y++)
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{
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if ( im_writeline( y, image, (PEL *)line1 ) == -1 )
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{
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free ( (char *)line1 ); free ( (char *)line2 );
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return( -1 );
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}
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}
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free ( (char *)line1 ); free ( (char *)line2 );
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return(0);
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}
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