125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/* Lab2LabS: quantise FLOAT Lab image into signed short format
|
|
*
|
|
* 12/12/02 JC
|
|
* - from im_Lab2LabS
|
|
* 1/11/09
|
|
* - gtkdoc
|
|
* - cleanups
|
|
* 20/9/12
|
|
* - redo as a class
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <glib/gi18n-lib.h>
|
|
|
|
#include <stdio.h>
|
|
#include <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#include "pcolour.h"
|
|
|
|
typedef VipsColourCode VipsLab2LabS;
|
|
typedef VipsColourCodeClass VipsLab2LabSClass;
|
|
|
|
G_DEFINE_TYPE( VipsLab2LabS, vips_Lab2LabS, VIPS_TYPE_COLOUR_CODE );
|
|
|
|
static void
|
|
vips_Lab2LabS_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
|
|
{
|
|
float * restrict p = (float *) in[0];
|
|
signed short * restrict q = (signed short *) 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);
|
|
|
|
q += 3;
|
|
p += 3;
|
|
}
|
|
}
|
|
|
|
static void
|
|
vips_Lab2LabS_class_init( VipsLab2LabSClass *class )
|
|
{
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
|
|
|
|
object_class->nickname = "Lab2LabS";
|
|
object_class->description = _( "transform float Lab to signed short" );
|
|
|
|
colour_class->process_line = vips_Lab2LabS_line;
|
|
}
|
|
|
|
static void
|
|
vips_Lab2LabS_init( VipsLab2LabS *Lab2LabS )
|
|
{
|
|
VipsColour *colour = VIPS_COLOUR( Lab2LabS );
|
|
VipsColourCode *code = VIPS_COLOUR_CODE( Lab2LabS );
|
|
|
|
colour->interpretation = VIPS_INTERPRETATION_LABS;
|
|
colour->format = VIPS_FORMAT_SHORT;
|
|
colour->input_bands = 3;
|
|
colour->bands = 3;
|
|
|
|
code->input_coding = VIPS_CODING_NONE;
|
|
code->input_format = VIPS_FORMAT_FLOAT;
|
|
}
|
|
|
|
/**
|
|
* vips_Lab2LabS: (method)
|
|
* @in: input image
|
|
* @out: (out): output image
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Turn Lab to LabS, signed 16-bit int fixed point.
|
|
*
|
|
* See also: vips_LabQ2Lab().
|
|
*
|
|
* Returns: 0 on success, -1 on error.
|
|
*/
|
|
int
|
|
vips_Lab2LabS( VipsImage *in, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "Lab2LabS", ap, in, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|
|
|