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#------------------------------------------------------------------------------
# File: XISF.pm
#
# Description: Read Extensible Image Serialization Format metadata
#
# Revisions: 2023-10-10 - P. Harvey Created
#
# References: 1) https://pixinsight.com/doc/docs/XISF-1.0-spec/XISF-1.0-spec.html
#------------------------------------------------------------------------------
package Image::ExifTool::XISF;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
use Image::ExifTool::XMP;
$VERSION = '1.00';
# XISF tags (ref 1)
%Image::ExifTool::XISF::Main = (
GROUPS => { 0 => 'XML', 1 => 'XML', 2 => 'Image' },
VARS => { LONG_TAGS => 1 },
NOTES => q{
This table lists some standard Extensible Image Serialization Format (XISF)
tags, but ExifTool will extract any other tags found. See
L<https://pixinsight.com/xisf/> for the specification.
},
ImageGeometry => { },
ImageSampleFormat => { },
ImageBounds => { },
ImageImageType => { Name => 'ImageType' },
ImageColorSpace => { Name => 'ColorSpace' },
ImageLocation => { },
ImageResolutionHorizontal => 'XResolution',
ImageResolutionVertical => 'YResolution',
ImageResolutionUnit => 'ResolutionUnit',
ImageICCProfile => {
Name => 'ICC_Profile',
ValueConv => 'Image::ExifTool::XMP::DecodeBase64($val)',
Binary => 1,
},
ImageICCProfileLocation => { Name => 'ICCProfileLocation' },
ImagePixelStorage => { },
ImageOffset => { Name => 'ImagePixelOffset' },
ImageOrientation => { Name => 'Orientation' },
ImageId => { Name => 'ImageID' },
ImageUuid => { Name => 'UUID' },
ImageData => { Binary => 1 },
'CreationTime' => {
Name => 'CreateDate',
Shift => 'Time',
Groups => { 2 => 'Time' },
ValueConv => 'Image::ExifTool::XMP::ConvertXMPDate($val)',
PrintConv => '$self->ConvertDateTime($val)',
},
CreatorApplication => { },
Abstract => { },
AccessRights => { },
Authors => { Groups => { 2 => 'Author' } },
BibliographicReferences => { },
BriefDescription => { },
CompressionLevel => { },
CompressionCodecs => { },
Contributors => { Groups => { 2 => 'Author' } },
Copyright => { Groups => { 2 => 'Author' } },
CreatorModule => { },
CreatorOS => { },
Description => { },
Keywords => { },
Languages => { },
License => { },
OriginalCreationTime => {
Name => 'DateTimeOriginal',
Description => 'Date/Time Original',
Shift => 'Time',
Groups => { 2 => 'Time' },
ValueConv => 'Image::ExifTool::XMP::ConvertXMPDate($val)',
PrintConv => '$self->ConvertDateTime($val)',
},
RelatedResources => { },
Title => { },
);
#------------------------------------------------------------------------------
# Handle properties in XISF metadata structures
# Inputs: 0) attribute list ref, 1) attr hash ref,
# 2) property name ref, 3) property value ref
# Returns: true if value was changed
sub HandleXISFAttrs($$$$)
{
my ($attrList, $attrs, $prop, $valPt) = @_;
return 0 unless defined $$attrs{id};
my ($changed, $a);
# use "id" as the tag name, "value" as the value, and ignore "type"
$$prop = $$attrs{id};
$$prop =~ s/^XISF://; # remove XISF namespace
if (defined $$attrs{value}) {
$$valPt = $$attrs{value};
$changed = 1;
}
my @attrs = @$attrList;
@$attrList = ( );
foreach $a (@attrs) {
if ($a eq 'id' or $a eq 'value' or $a eq 'type') {
delete $$attrs{$a};
} else {
push @$attrList, $a;
}
}
return $changed;
}
#------------------------------------------------------------------------------
# Read information in a XISF document
# Inputs: 0) ExifTool ref, 1) dirInfo ref
# Returns: 1 on success, 0 if this wasn't a valid XISF file
sub ProcessXISF($$)
{
my ($et, $dirInfo) = @_;
my $raf = $$dirInfo{RAF};
my $buff;
return 0 unless $raf->Read($buff, 16) == 16 and $buff =~ /^XISF0100/;
$et->SetFileType();
SetByteOrder('II');
my $tagTablePtr = GetTagTable('Image::ExifTool::XISF::Main');
my $hdrLen = Get32u(\$buff, 8);
$raf->Read($buff, $hdrLen) == $hdrLen or $et->Warn('Error reading XISF header'), return 1;
$et->FoundTag(XML => $buff);
my %dirInfo = (
DataPt => \$buff,
IgnoreProp => { xisf => 1, Metadata => 1, Property => 1 },
XMPParseOpts => { AttrProc => \&HandleXISFAttrs },
);
Image::ExifTool::XMP::ProcessXMP($et, \%dirInfo, $tagTablePtr);
my $geo = $$et{VALUE}{ImageGeometry};
if ($geo) {
my ($w, $h, $n) = split /:/, $geo;
$et->FoundTag(ImageWidth => $w);
$et->FoundTag(ImageHeight => $h);
$et->FoundTag(NumPlanes => $n);
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::XISF - Read Extensible Image Serialization Format metadata
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to read meta
information from XISF (Extensible Image Serialization Format) images.
=head1 AUTHOR
Copyright 2003-2025, Phil Harvey (philharvey66 at gmail.com)
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 REFERENCES
=over 4
=item L<https://pixinsight.com/doc/docs/XISF-1.0-spec/XISF-1.0-spec.html>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/XISF Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
|
