libvips/libsrc/morphology/im_profile.c

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2007-08-29 18:23:50 +02:00
/* @(#) dir = 0:
* @(#) For each vertical line, find the position of the first
* @(#) non-zero pixel from the top. Output is USHORT with
* @(#) width = input width, height = 1.
* @(#)
* @(#) dir = 1:
* @(#) For each horizontal line, find the position of the first
* @(#) non-zero pixel from the left. Output is USHORT with
* @(#) width = 1, height = input height
* @(#)
* @(#) int im_profile( IMAGE *in, IMAGE *out, int dir )
* @(#)
* @(#) Returns 0 on success and non-zero on error
*
* 11/8/99 JC
* - from im_cntlines()
* 22/4/04
* - now outputs horizontal/vertical image
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
int
im_profile( IMAGE *in, IMAGE *out, int dir )
{
int x, y;
unsigned short *buf;
/* Check im.
*/
if( im_iocheck( in, out ) )
return( -1 );
if( in->Coding != IM_CODING_NONE || in->BandFmt != IM_BANDFMT_UCHAR ||
in->Bands != 1 ) {
im_errormsg( "im_profile: 1-band uchar uncoded only" );
return( -1 );
}
if( dir != 0 && dir != 1 ) {
im_errormsg( "im_profile: dir not 0 or 1" );
return( -1 );
}
if( im_cp_desc( out, in ) )
return( -1 );
out->Type = IM_TYPE_HISTOGRAM;
if( dir == 0 ) {
out->Xsize = in->Xsize;
out->Ysize = 1;
}
else {
out->Xsize = 1;
out->Ysize = in->Ysize;
}
out->BandFmt = IM_BANDFMT_USHORT;
out->Bbits = IM_BBITS_SHORT;
if( im_setupout( out ) )
return( -1 );
if( !(buf = IM_ARRAY( out, out->Xsize, unsigned short )) )
return( -1 );
if( dir == 0 ) {
/* Find vertical lines.
*/
for( x = 0; x < in->Xsize; x++ ) {
PEL *p = (PEL *) IM_IMAGE_ADDR( in, x, 0 );
int lsk = IM_IMAGE_SIZEOF_LINE( in );
for( y = 0; y < in->Ysize; y++ )
if( p[y * lsk] )
break;
buf[x] = y;
}
if( im_writeline( 0, out, (PEL *) buf ) )
return( -1 );
}
else {
/* Count horizontal lines.
*/
for( y = 0; y < in->Ysize; y++ ) {
PEL *p = (PEL *) IM_IMAGE_ADDR( in, 0, y );
for( x = 0; x < in->Xsize; x++ )
if( p[x] )
break;
buf[0] = x;
if( im_writeline( y, out, (PEL *) buf ) )
return( -1 );
}
}
return( 0 );
}