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/* im_vips2mask
*
* Author: J.Cupitt
* Written on: 6/6/94
* Modified on:
*
* 16/10/06
* - allow 1xn-band images too
* 23/2/07
* - oop, broken for nx1 m-band images
* - now casts to double for you
* 1/2/10
* - gtkdoc
*/
/*
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 <string.h>
#include <vips/vips.h>
/**
* im_vips2mask:
* @in: input image
* @filename: name for output mask
*
* Make a mask from an image. All images are cast to %IM_BANDFMT_DOUBLE
* before processing. There are two cases for handling bands:
*
* If the image has a single band, im_vips2mask() will write a mask the same
* size as the image.
*
* If the image has more than one band, it must be one pixel high or wide. In
* this case the output mask uses that axis to represent band values.
*
* See also: im_mask2vips(), im_measure_area().
*
* Returns: a #DOUBLEMASK with @outname set as the name, or NULL on error
*/
DOUBLEMASK *
im_vips2mask( IMAGE *in, const char *filename )
{
int width, height;
DOUBLEMASK *out;
/* double* only: cast if necessary.
*/
if( in->BandFmt != IM_BANDFMT_DOUBLE ) {
IMAGE *t;
if( !(t = im_open( "im_vips2mask", "p" )) )
return( NULL );
if( im_clip2fmt( in, t, IM_BANDFMT_DOUBLE ) ||
!(out = im_vips2mask( t, filename )) ) {
im_close( t );
return( NULL );
}
im_close( t );
return( out );
}
/* Check the image.
*/
if( im_incheck( in ) ||
im_check_uncoded( "im_vips2mask", in ) )
return( NULL );
if( in->Bands == 1 ) {
width = in->Xsize;
height = in->Ysize;
}
else if( in->Xsize == 1 ) {
width = in->Bands;
height = in->Ysize;
}
else if( in->Ysize == 1 ) {
width = in->Xsize;
height = in->Bands;
}
else {
im_error( "im_vips2mask",
"%s", _( "one band, nx1, or 1xn images only" ) );
return( NULL );
}
if( !(out = im_create_dmask( filename, width, height )) )
return( NULL );
if( in->Bands > 1 && in->Ysize == 1 ) {
double *data = (double *) in->data;
int x, y;
/* Need to transpose: the image is RGBRGBRGB, we need RRRGGGBBB.
*/
for( y = 0; y < height; y++ )
for( x = 0; x < width; x++ )
out->coeff[x + y * width] =
data[x * height + y];
}
else
memcpy( out->coeff, in->data,
width * height * sizeof( double ) );
return( out );
}
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