libvips/libsrc/colour/im_disp2XYZ.c

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/* @(#) Turn displayable rgb files to XYZ.
* @(#)
* @(#) Usage:
* @(#) im_disp2XYZ( imagein, imageout, display )
* @(#) IMAGE *imagein, *imageout;
* @(#) struct im_col_display *display;
* @(#)
* @(#) uchar in, float out.
* @(#)
* @(#) Returns: -1 on error, else 0
* Modified:
* 15/11/94 JC
* - memory leak fixed
* - error message added
* 16/11/94 JC
* - partialed
*/
/*
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 <stdio.h>
#include <math.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Convert a buffer.
*/
void
imb_disp2XYZ( PEL *p, float *q, int n,
struct im_col_display *d, struct im_col_tab_disp *table )
{
int x;
for( x = 0; x < n; x++ ) {
int r = p[0];
int g = p[1];
int b = p[2];
float X, Y, Z;
p += 3;
im_col_rgb2XYZ(d, table, r, g, b, &X, &Y, &Z);
q[0] = X;
q[1] = Y;
q[2] = Z;
q += 3;
}
}
int
im_disp2XYZ( IMAGE *in, IMAGE *out, struct im_col_display *d )
{
struct im_col_tab_disp *table; /* pointer to the lookup tables */
/* Check input image.
*/
if( in->Bands != 3 || in->BandFmt != IM_BANDFMT_UCHAR ||
in->Coding != IM_CODING_NONE ) {
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im_error( "im_disp2XYZ",
"%s", _( "input not 3-band uncoded char" ) );
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return( -1 );
}
/* Prepare the output image
*/
if( im_cp_desc( out, in ) )
return( -1 );
out->Bbits = IM_BBITS_FLOAT;
out->BandFmt = IM_BANDFMT_FLOAT;
out->Type = IM_TYPE_XYZ;
/* Prepare the lookup tables
*/
table = im_col_make_tables_RGB( out, d );
/* Do the processing.
*/
if( im_wrapone( in, out,
(im_wrapone_fn) imb_disp2XYZ, d, table ) )
return( -1 );
return( 0 );
}