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/* LabQ2LabS
*
* 17/11/93 JC
* - adapted from im_LabQ2LabS()
* 16/11/94 JC
* - uses new im_wrap_oneonebuf() fn
* 9/2/95 JC
* - new im_wrapone function
* 2/11/09
* - gtkdoc
* 21/9/12
* - 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 <vips/intl.h>
#include <stdio.h>
#include <vips/vips.h>
#include "pcolour.h"
typedef VipsColourCode VipsLabQ2LabS;
typedef VipsColourCodeClass VipsLabQ2LabSClass;
G_DEFINE_TYPE( VipsLabQ2LabS, vips_LabQ2LabS, VIPS_TYPE_COLOUR_CODE );
/* CONVERT n pels from packed 32bit Lab to signed short.
*/
static void
vips_LabQ2LabS_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
{
unsigned char * restrict p = (unsigned char *) in[0];
signed short * restrict q = (signed short *) out;
int i;
unsigned char ext;
signed short l, a, b;
for( i = 0; i < width; i++ ) {
/* Get most significant 8 bits of lab.
*/
l = p[0] << 7;
a = p[1] << 8;
b = p[2] << 8;
/* Get x-tra bits.
*/
ext = p[3];
p += 4;
/* Shift and mask in to lab.
*/
l |= (unsigned char) (ext & 0xc0) >> 1;
a |= (ext & 0x38) << 2;
b |= (ext & 0x7) << 5;
/* Write!
*/
q[0] = l;
q[1] = a;
q[2] = b;
q += 3;
}
}
static void
vips_LabQ2LabS_class_init( VipsLabQ2LabSClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
object_class->nickname = "LabQ2LabS";
object_class->description = _( "unpack a LabQ image to short Lab" );
colour_class->process_line = vips_LabQ2LabS_line;
}
static void
vips_LabQ2LabS_init( VipsLabQ2LabS *LabQ2LabS )
{
VipsColour *colour = VIPS_COLOUR( LabQ2LabS );
VipsColourCode *code = VIPS_COLOUR_CODE( LabQ2LabS );
colour->coding = VIPS_CODING_NONE;
colour->interpretation = VIPS_INTERPRETATION_LABS;
colour->format = VIPS_FORMAT_SHORT;
colour->bands = 3;
code->input_coding = VIPS_CODING_LABQ;
}
/**
* vips_LabQ2LabS:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Unpack a LabQ (#VIPS_CODING_LABQ) image to a three-band short image.
*
* See also: vips_LabS2LabQ(), vips_LabQ2LabS(), vips_rad2float().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_LabQ2LabS( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "LabQ2LabS", ap, in, out );
va_end( ap );
return( result );
}
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