#line 1 "Image/ExifTool/Radiance.pm"
#------------------------------------------------------------------------------
# File:         Radiance.pm
#
# Description:  Read Radiance RGBE HDR meta information
#
# Revisions:    2011/12/10 - P. Harvey Created
#
# References:   1) http://www.graphics.cornell.edu/online/formats/rgbe/
#               2) http://radsite.lbl.gov/radiance/refer/filefmts.pdf
#------------------------------------------------------------------------------

package Image::ExifTool::Radiance;

use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);

$VERSION = '1.01';

# Radiance tags
%Image::ExifTool::Radiance::Main = (
    GROUPS => { 2 => 'Image' },
    NOTES => q{
        Information extracted from Radiance RGBE HDR images.  Tag ID's are all
        uppercase as stored in the file, but converted to lowercase by when
        extracting to avoid conflicts with internal ExifTool variables.  See
        L<http://radsite.lbl.gov/radiance/refer/filefmts.pdf> and
        L<http://www.graphics.cornell.edu/online/formats/rgbe/> for the
        specification.
    },
    _orient   => {
        Name => 'Orientation',
        PrintConv => {
            '-Y +X' => 'Horizontal (normal)',
            '-Y -X' => 'Mirror horizontal',
            '+Y -X' => 'Rotate 180',
            '+Y +X' => 'Mirror vertical',
            '+X -Y' => 'Mirror horizontal and rotate 270 CW',
            '+X +Y' => 'Rotate 90 CW',
            '-X +Y' => 'Mirror horizontal and rotate 90 CW',
            '-X -Y' => 'Rotate 270 CW',
        },
    },
    _command  => 'Command',
    software  => 'Software',
    view      => 'View',
   'format'   => 'Format', # <-- this is the one that caused the conflict when uppercase
    exposure  => {
        Name => 'Exposure',
        Notes => 'divide pixel values by this to get watts/steradian/meter^2',
    },
    gamma     => 'Gamma',
    colorcorr => 'ColorCorrection',
    pixaspect => 'PixelAspectRatio',
    primaries => 'ColorPrimaries',
);

#------------------------------------------------------------------------------
# Extract information from a Radiance HDR file
# Inputs: 0) ExifTool object reference, 1) DirInfo reference
# Returns: 1 on success, 0 if this wasn't a valid RGBE image
sub ProcessHDR($$)
{
    my ($et, $dirInfo) = @_;
    my $raf = $$dirInfo{RAF};
    my $buff;
    local $/ = "\x0a";  # set newline character for reading

    # verify this is a valid RIFF file
    return 0 unless $raf->ReadLine($buff) and $buff =~ /^#\?(RADIANCE|RGBE)\x0a/s;
    $et->SetFileType();
    my $tagTablePtr = GetTagTable('Image::ExifTool::Radiance::Main');

    while ($raf->ReadLine($buff)) {
        chomp $buff;
        last unless length($buff) > 0 and length($buff) < 4096;
        unless ($buff =~ /^(.*)?\s*=\s*(.*)/) {
            $et->HandleTag($tagTablePtr, '_command', $buff);
            next;
        }
        # use lower-case tag names to avoid conflicts with reserved tag table entries
        my ($tag, $val) = (lc $1, $2);
        my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
        unless ($tagInfo) {
            my $name = $tag;
            $name =~ tr/-_a-zA-Z0-9//dc;
            next unless length($name) > 1;
            $name = ucfirst $name;
            $tagInfo = { Name => $name };
            AddTagToTable($tagTablePtr, $tag, $tagInfo);
        }
        $et->FoundTag($tagInfo, $val);
    }
    # get image dimensions
    if ($raf->ReadLine($buff) and $buff =~ /([-+][XY])\s*(\d+)\s*([-+][XY])\s*(\d+)/) {
        $et->HandleTag($tagTablePtr, '_orient', "$1 $3");
        $et->FoundTag('ImageHeight', $2);
        $et->FoundTag('ImageWidth', $4);
    }
    return 1;
}

1;  # end

__END__

#line 144

