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package Image::Info::XPM;
$VERSION = '1.06';
#Path to X11 RGB database
$RGBLIB ||= "/usr/X11R6/lib/X11/rgb.txt";
use strict;
use Image::Xpm 1.08;
sub process_file{
    my($info, $source, $opts) = @_;
    $SIG{__WARN__} = sub {
        $info->push_info(0, "Warn", shift);
    };
    my $i = Image::Xpm->new(-width => 0, -height => 0);
    # loading the file as a seperate step avoids a "-r" test, this would
    # file with in-memory strings (aka fake files)
    $i->load($source);
    $info->push_info(0, "color_type" => "Indexed-RGB");
    $info->push_info(0, "file_ext" => "xpm");
    $info->push_info(0, "file_media_type" => "image/x-xpixmap");
    $info->push_info(0, "height", $i->get(-height));
    $info->push_info(0, "resolution", "1/1");
    $info->push_info(0, "width", $i->get(-width));
    $info->push_info(0, "BitsPerSample" => 8);
    $info->push_info(0, "SamplesPerPixel", 1);
    $info->push_info(0, "XPM_CharactersPerPixel" => $i->get(-cpp) );
    # XXX is this always?
    $info->push_info(0, "ColorResolution", 8);
    $info->push_info(0, "ColorTableSize" => $i->get(-ncolours) );
    if( $opts->{ColorPalette} ){
        $info->push_info(0, "ColorPalette" => [keys %{$i->get(-cindex)}] );
    }
    if( $opts->{L1D_Histogram} ){
        #Do Histograms
        my(%RGB, @l1dhist, $R, $G, $B, $color);
        for(my $y=0; $y<$i->get(-height); $y++){
            for(my $x=0; $x<$i->get(-width); $x++){
                $color = $i->xy($x, $y);
                if( $color !~ /^#/ ){
                    unless( exists($RGB{white}) ){
                        local $_;
                        if( open(RGB, $Image::Info::XPM::RGBLIB) ){
                            while(<RGB>){
                                /(\d+)\s+(\d+)\s+(\d+)\s+(.*)/;
                                $RGB{$4}=[$1,$2,$3];
                            }
                        }
                        else{
                            $RGB{white} = "0 but true";
                            $info->push_info(0, "Warn", "Unable to open RGB database, you may need to set \$Image::Info::XPM::RGBLIB or define \$RGBLIB in ". __FILE__);
                        }
                    }
                    $R = $RGB{$color}->[0];
                    $G = $RGB{$color}->[1];
                    $B = $RGB{$color}->[2];
                }
                else{
                    $R = hex(substr($color,1,2));
                    $G = hex(substr($color,3,2));
                    $B = hex(substr($color,5,2));
                }
                if( $opts->{L1D_Histogram} ){
                    $l1dhist[(.3*$R + .59*$G + .11*$B)]++;
                }
            }
        }
        if( $opts->{L1D_Histogram} ){
            $info->push_info(0, "L1D_Histogram", [@l1dhist]);
        }
    }
    $info->push_info(0, "HotSpotX" => $i->get(-hotx) );
    $info->push_info(0, "HotSpotY" => $i->get(-hoty) );
    $info->push_info(0, 'XPM_Extension-'.ucfirst($i->get(-extname)) => $i->get(-extlines)) if
        $i->get(-extname);
    for (@{$i->get(-comments)}) {
        $info->push_info(0, "Comment", $_);
    }
}
1;
__END__
HideShow 116 lines of Pod
=head1 NAME
Image::Info::XPM - XPM support for Image::Info
=head1 SYNOPSIS
 use Image::Info qw(image_info dim);
 my $info = image_info("image.xpm");
 if (my $error = $info->{error}) {
     die "Can't parse image info: $error\n";
 }
 my $color = $info->{color_type};
 my($w, $h) = dim($info);
=head1 DESCRIPTION
This modules supplies the standard key names
except for Compression, Gamma, Interlace, LastModificationTime, as well as:
=over
=item ColorPalette
Reference to an array of all colors used.
This key is only present if C<image_info> is invoked
as C<image_info({ColorPaletteE<gt>=1})>.
=item ColorTableSize
The number of colors the image uses.
=item HotSpotX
The x-coord of the image's hotspot.
Set to -1 if there is no hotspot.
=item HotSpotY
The y-coord of the image's hotspot.
Set to -1 if there is no hotspot.
=item L1D_Histogram
Reference to an array representing a one dimensioanl luminance
histogram. This key is only present if C<image_info> is invoked
as C<image_info($file, L1D_Histogram=E<gt>1)>. The range is from 0 to 255,
however auto-vivification is used so a null field is also 0,
and the array may not actually contain 255 fields.
=item XPM_CharactersPerPixel
This is typically 1 or 2. See L<Image::Xpm>.
=item XPM_Extension-.*
XPM Extensions (the most common is XPMEXT) if present.
=back
=head1 METHODS
=head2 process_file()
     
        $info->process_file($source, $options);
Processes one file and sets the found info fields in the C<$info> object.
=head1 AUTHOR
=head1 FILES
This module requires L<Image::Xpm>
I<$Image::Info::XPM::RGBLIB> is set to F</usr/X11R6/lib/X11/rgb.txt>
by default, this is used to resolve textual color names to their RGB
counterparts.
=head1 SEE ALSO
L<Image::Info>, L<Image::Xpm>
=head1 NOTES
For more information about XPM see:
 ftp://ftp.x.org/contrib/libraries/xpm-README.html
=head1 CAVEATS
While the module attempts to be as robust as possible, it may not recognize
older XBMs (Versions 1-3), if this is the case try inserting S</* XPM */>
as the first line.
=head1 AUTHOR
Jerrad Pierce <belg4mit@mit.edu>/<webmaster@pthbb.org>
Now maintained by Tels - (c) 2006.
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut
=begin register
MAGIC: /(^\/\* XPM \*\/)|(static\s+char\s+\*\w+\[\]\s*=\s*{\s*"\d+)/
See L<Image::Info::XPM> for details.
=end register
=cut