93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
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/* @(#) im_Lab2LabS: quantise FLOAT Lab image into signed short format
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* 12/12/02 JC
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* - from im_Lab2LabQ
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <vips/intl.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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void
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imb_Lab2LabS( float *in, signed short *out, int n )
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{
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float *p = in;
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signed short *q = out;
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int c;
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for( c = 0; c < n; c++ ) {
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q[0] = p[0] * (32767.0 / 100.0);
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q[1] = p[1] * (32768.0 / 128.0);
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q[2] = p[2] * (32768.0 / 128.0);
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q += 3;
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p += 3;
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}
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}
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int
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im_Lab2LabS( IMAGE *labim, IMAGE *outim )
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{
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/* Check for uncoded Lab type
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*/
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if( labim->Coding != IM_CODING_NONE ) {
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im_errormsg( "im_Lab2LabS: uncoded input only" );
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return( -1 );
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}
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if( labim->BandFmt != IM_BANDFMT_FLOAT || labim->Bands != 3 ) {
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im_errormsg( "im_Lab2LabS: three-band float input only" );
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return( -1 );
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}
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/* Set up output image.
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*/
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if( im_cp_desc( outim, labim ) )
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return( -1 );
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outim->Type = IM_TYPE_LABS;
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outim->BandFmt = IM_BANDFMT_SHORT;
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outim->Bbits = IM_BBITS_SHORT;
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/* Process.
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*/
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if( im_wrapone( labim, outim,
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(im_wrapone_fn) imb_Lab2LabS, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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