194 lines
6.0 KiB
C
194 lines
6.0 KiB
C
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/* Convert Radiance 32bit packed format to float.
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* 3/3/09
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* - from LabQ2Lab and Radiance sources
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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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/*
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Sections of this file from Greg Ward and Radiance with kind
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permission. The Radience copyright notice appears below.
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*/
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/* ====================================================================
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* The Radiance Software License, Version 1.0
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*
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* Copyright (c) 1990 - 2009 The Regents of the University of California,
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* through Lawrence Berkeley National Laboratory. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes Radiance software
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* (http://radsite.lbl.gov/)
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* developed by the Lawrence Berkeley National Laboratory
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* (http://www.lbl.gov/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
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* and "The Regents of the University of California" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact radiance@radsite.lbl.gov.
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*
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* 5. Products derived from this software may not be called "Radiance",
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* nor may "Radiance" appear in their name, without prior written
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* permission of Lawrence Berkeley National Laboratory.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more
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* information on Lawrence Berkeley National Laboratory, please see
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* <http://www.lbl.gov/>.
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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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/* Begin copy-paste from Radiance sources.
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*/
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#define RED 0
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#define GRN 1
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#define BLU 2
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#define CIEX 0 /* or, if input is XYZ... */
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#define CIEY 1
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#define CIEZ 2
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#define EXP 3 /* exponent same for either format */
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#define COLXS 128 /* excess used for exponent */
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#define WHT 3 /* used for RGBPRIMS type */
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#undef BYTE
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#define BYTE unsigned char /* 8-bit unsigned integer */
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typedef BYTE COLR[4]; /* red, green, blue (or X,Y,Z), exponent */
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typedef float COLORV;
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typedef COLORV COLOR[3]; /* red, green, blue (or X,Y,Z) */
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#define copycolor(c1,c2) ((c1)[0]=(c2)[0],(c1)[1]=(c2)[1],(c1)[2]=(c2)[2])
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static void
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colr_color(col, clr) /* convert short to float color */
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register COLOR col;
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register COLR clr;
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{
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double f;
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if (clr[EXP] == 0)
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col[RED] = col[GRN] = col[BLU] = 0.0;
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else {
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f = ldexp(1.0, (int)clr[EXP]-(COLXS+8));
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col[RED] = (clr[RED] + 0.5)*f;
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col[GRN] = (clr[GRN] + 0.5)*f;
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col[BLU] = (clr[BLU] + 0.5)*f;
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}
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}
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/* End copy-paste from Radiance sources.
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*/
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void
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rad2float( COLR *inp, COLOR *outbuf, int n )
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{
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colr_color(outbuf[0], inp[0]);
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while (--n > 0) {
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outbuf++; inp++;
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if (inp[0][RED] == inp[-1][RED] &&
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inp[0][GRN] == inp[-1][GRN] &&
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inp[0][BLU] == inp[-1][BLU] &&
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inp[0][EXP] == inp[-1][EXP])
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copycolor(outbuf[0], outbuf[-1]);
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else
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colr_color(outbuf[0], inp[0]);
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}
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}
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int
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im_rad2float( IMAGE *in, IMAGE *out )
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{
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/* Must be 4-band uchar.
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*/
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if( in->Bands != 4 || in->BandFmt != IM_BANDFMT_UCHAR ||
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in->Coding != IM_CODING_NONE ) {
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im_error( "im_rad2float", "%s",
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_( "not a 4-band uchar uncoded image" ) );
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return( -1 );
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}
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if( im_cp_desc( out, in ) )
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return( -1 );
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out->Bands = 3;
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out->BandFmt = IM_BANDFMT_FLOAT;
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out->Bbits = im_bits_of_fmt( out->BandFmt );
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if( im_wrapone( in, out,
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(im_wrapone_fn) rad2float, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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