#!/usr/bin/perl -w
#  
# This file is a part of PFS CALIBRATION package.
# ---------------------------------------------------------------------- 
# Copyright (C) 2004 Grzegorz Krawczyk, <gkrawczyk@users.sourceforge.net>
# 
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU 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 General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
# ---------------------------------------------------------------------- 
#
# $Id: pfsinhdrgen,v 1.4 2006/08/22 18:34:04 gkrawczyk Exp $

use Getopt::Long;

#--- check params
GetOptions ('v|verbose' => \$verbose,
            'h|help' => \$help);

if( $help or @ARGV<1 ) {
    print STDERR "Usage: pfsinhdrgen [--verbose] <file.hdrgen>\n";
    exit;
}

($hdrgen) = $ARGV[0];

(-e $hdrgen) or die "File does not exist '$hdrgen'";
open HDRGEN, "<$hdrgen";

#--- parse file
while( $line=<HDRGEN> )
{
    @token = split " ", $line;
    $file = $token[0];
    $inv_exposure_time = $token[1];
    $aperture = $token[2];
    $iso_speed = $token[3];

    ## defaults
    $iso_speed = 100 if( $iso_speed==0);
    $aperture = 1.0 if( $aperture==0);

    ## APEX calculations
    $Av = 2 * log($aperture) / log(2);
    $Tv = log($inv_exposure_time) / log(2);
    $Sv = log( $iso_speed / 3.125 ) / log(2);

    ## Brightness value
    $Bv = $Av+$Tv-$Sv;
    
    (-e $file) or die "Missing image '$file'";
    
    print STDERR "pfsinhdrgen: reading $file (iso$iso_speed,f/$aperture,t=$inv_exposure_time)\n" if( $verbose );;
    system "pfsin $file 2> /dev/null | pfstag --set \"BV=$Bv\"\n";
}

close HDRGEN;