PC Professionell 2004 December/PCpro_2004_12.ISO/files/webserver/tsw/TSW_3.4.0.exe/Apache2/perl/XPM.pm

Perl POD Document | 2004-01-07 | 4.5 KB | 188 lines

package Image::Info::XPM;
$VERSION = '1.03';
#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(-file, $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__
=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

=item 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 <[e-mail]>/<[e-mail]>

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