135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/* @(#) test pattern with increasing spatial frequence in X and amplitude in Y
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* @(#) factor should be between 0 and 1 and determines the spatial frequencies
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* @(#) Creates an one band float image
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* @(#) Image has values between +ysize*ysize and -ysize*ysize
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* @(#)
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* @(#) int im_eye(image, xsize, ysize, factor)
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* @(#) IMAGE *image;
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* @(#) int xsize, ysize;
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* @(#) double factor;
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* @(#)
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* @(#) Returns -1 on error and 0 on success
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*
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* Copyright: 1990, 1991, N.Dessipris.
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*
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* Author N. Dessipris
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* Written on 30/05/1990
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* Updated on: 27/01/1991, 07/03/1991,
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* 22/7/93 JC
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* - im_outcheck() added
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* 30/8/95 JC
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* - modernized
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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_feye( IMAGE *image, const int xsize, const int ysize, const double factor )
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{
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int x, y;
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double constant;
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double *lut;
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float *line;
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/* Check input args
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*/
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if( im_outcheck( image ) )
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return( -1 );
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if( factor > 1.0 || factor <= 0.0 ) {
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im_errormsg( "im_feye: factor should be in [1,0)" );
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return( -1 );
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}
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/* Set image descriptor
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*/
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im_initdesc( image, xsize, ysize, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT,
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IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 );
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if( im_setupout( image ) )
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return( -1 );
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/* Allocate space for line buffer.
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*/
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if( !(line = IM_ARRAY( image, xsize, float )) )
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return( -1 );
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/* Make a lut for easy calculations.
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*/
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if( !(lut = IM_ARRAY( image, image->Xsize, double )) )
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return( -1 );
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constant = factor * IM_PI/(2*(xsize - 1));
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for( x = 0; x < image->Xsize; x++ )
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lut[x] = cos( constant*x*x ) / ((ysize - 1)*(ysize - 1));
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/* Make image.
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*/
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for( y = 0; y < image->Ysize; y++ ) {
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for( x = 0; x < image->Xsize; x++ )
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line[x] = y*y*lut[x];
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if( im_writeline( y, image, (PEL *) line ) )
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return( -1 );
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}
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return( 0 );
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}
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/* As above, but make a IM_BANDFMT_UCHAR image.
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*/
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int
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im_eye( IMAGE *image, const int xsize, const int ysize, const double factor )
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{
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IMAGE *t1 = im_open_local( image, "im_eye:1", "p" );
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IMAGE *t2 = im_open_local( image, "im_eye:2", "p" );
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if( !t1 )
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return( -1 );
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/* Change range to [0,255].
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*/
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if( im_feye( t1, xsize, ysize, factor ) ||
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im_lintra( 127.5, t1, 127.5, t2 ) ||
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im_clip( t2, image ) )
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return( -1 );
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return( 0 );
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}
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