147 lines
3.3 KiB
C
147 lines
3.3 KiB
C
/* LabQ2LabS
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*
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* 17/11/93 JC
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* - adapted from im_LabQ2LabS()
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* 16/11/94 JC
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* - uses new im_wrap_oneonebuf() fn
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* 9/2/95 JC
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* - new im_wrapone function
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* 2/11/09
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* - gtkdoc
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* 21/9/12
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* - redo as a class
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <vips/vips.h>
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#include "pcolour.h"
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typedef VipsColourCode VipsLabQ2LabS;
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typedef VipsColourCodeClass VipsLabQ2LabSClass;
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G_DEFINE_TYPE( VipsLabQ2LabS, vips_LabQ2LabS, VIPS_TYPE_COLOUR_CODE );
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/* CONVERT n pels from packed 32bit Lab to signed short.
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*/
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static void
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vips_LabQ2LabS_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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unsigned char * restrict p = (unsigned char *) in[0];
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signed short * restrict q = (signed short *) out;
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int i;
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unsigned char ext;
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signed short l, a, b;
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for( i = 0; i < width; i++ ) {
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/* Get most significant 8 bits of lab.
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*/
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l = p[0] << 7;
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a = p[1] << 8;
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b = p[2] << 8;
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/* Get x-tra bits.
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*/
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ext = p[3];
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p += 4;
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/* Shift and mask in to lab.
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*/
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l |= (unsigned char) (ext & 0xc0) >> 1;
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a |= (ext & 0x38) << 2;
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b |= (ext & 0x7) << 5;
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/* Write!
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*/
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q[0] = l;
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q[1] = a;
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q[2] = b;
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q += 3;
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}
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}
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static void
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vips_LabQ2LabS_class_init( VipsLabQ2LabSClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
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object_class->nickname = "LabQ2LabS";
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object_class->description = _( "unpack a LabQ image to short Lab" );
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colour_class->process_line = vips_LabQ2LabS_line;
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}
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static void
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vips_LabQ2LabS_init( VipsLabQ2LabS *LabQ2LabS )
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{
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VipsColour *colour = VIPS_COLOUR( LabQ2LabS );
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VipsColourCode *code = VIPS_COLOUR_CODE( LabQ2LabS );
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colour->coding = VIPS_CODING_NONE;
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colour->interpretation = VIPS_INTERPRETATION_LABS;
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colour->format = VIPS_FORMAT_SHORT;
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colour->bands = 3;
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code->input_coding = VIPS_CODING_LABQ;
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}
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/**
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* vips_LabQ2LabS: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Unpack a LabQ (#VIPS_CODING_LABQ) image to a three-band short image.
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*
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* See also: vips_LabS2LabQ(), vips_LabQ2LabS(), vips_rad2float().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_LabQ2LabS( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "LabQ2LabS", ap, in, out );
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va_end( ap );
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return( result );
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}
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