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/* LabS2Lab()
*
* 12/12/02 JC
* - adapted from im_LabS2LabQ()
* 2/11/09
* - gtkdoc, cleanup
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <vips/vips.h>
#include "pcolour.h"
typedef VipsColourCode VipsLabS2Lab;
typedef VipsColourCodeClass VipsLabS2LabClass;
G_DEFINE_TYPE( VipsLabS2Lab, vips_LabS2Lab, VIPS_TYPE_COLOUR_CODE );
/* Convert n pels from signed short to Lab.
*/
static void
vips_LabS2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
{
signed short *p = (signed short *) in[0];
float *q = (float *) out;
int i;
for( i = 0; i < width; i++ ) {
q[0] = p[0] / (32767.0 / 100.0);
q[1] = p[1] / (32768.0 / 128.0);
q[2] = p[2] / (32768.0 / 128.0);
p += 3;
q += 3;
}
}
static void
vips_LabS2Lab_class_init( VipsLabS2LabClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
object_class->nickname = "LabS2Lab";
object_class->description = _( "transform signed short Lab to float" );
colour_class->process_line = vips_LabS2Lab_line;
}
static void
vips_LabS2Lab_init( VipsLabS2Lab *LabS2Lab )
{
VipsColour *colour = VIPS_COLOUR( LabS2Lab );
VipsColourCode *code = VIPS_COLOUR_CODE( LabS2Lab );
colour->interpretation = VIPS_INTERPRETATION_LAB;
colour->format = VIPS_FORMAT_FLOAT;
colour->input_bands = 3;
colour->bands = 3;
code->input_coding = VIPS_CODING_NONE;
code->input_format = VIPS_FORMAT_SHORT;
}
/**
* vips_LabS2Lab:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Convert a LabS three-band signed short image to a three-band float image.
*
* See also: vips_LabS2Lab().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_LabS2Lab( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "LabS2Lab", ap, in, out );
va_end( ap );
return( result );
}
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