Use Gtk2's SVG library. Then you can load the svg as a pixbuf, and manipulate, slice and dice, and convert to png. Here is a start. This autoresizes the svg when you resize the window.

#!/usr/bin/perl
use warnings;
use strict;
use Glib qw(TRUE FALSE);
use Gnome2::Rsvg;

Gtk2->init;

my $img;

my $mw = Gtk2::Window->new;

$mw->signal_connect (delete_event => sub { Gtk2->main_quit });

my $vbox = Gtk2::VBox->new (FALSE, 4);
$vbox->set_border_width (4);
$vbox->show;

# Create the main box
my $vp = Gtk2::Viewport->new(undef, undef);

# Layout the stuff
$vbox->pack_start ($vp, TRUE, TRUE, 0);
$vp->show;

$mw->add( $vbox ); 

get_svg(400,400);

$mw->signal_connect (event_after => \&event_after);

#$mw->add_events ([qw/ button-press-mask
#                      button-release-mask
#                      key-release-mask
#                /]);

#$mw->signal_connect('button-release-event' => sub {
#        my ($widget,$event) = @_;
#        #count is in the same namespace as the closure
#            print "release\n";
#     });

#$mw->signal_connect (event => sub {
#         my ($item, $event) = @_;
#         warn "event ".$event->type."\n";
#return FALSE;
#});

#$mw->signal_connect (realize => sub {
             #$window->move ($pos->{x}, $pos->{y});
             #$window->resize ($pos->{width}, $pos->{height});
#             print "1\n";
#});

$mw->show;
Gtk2->main;
################################################3
sub get_svg {
    
        my ($x,$y) = @_; 

        $vp->remove($img) if defined $img;
        
    my $file = 'svg.svg';
    
    my $pb = Gnome2::Rsvg->pixbuf_from_file_at_zoom_with_max($file,15,
+15,$x,$y);
        #  ($file, x_zoom, y_zoom, max_x, max_y )

        $img = Gtk2::Image->new_from_pixbuf($pb);

        #($x, $y) = ($pb->get_width, $pb->get_height);
        
    $vp->add($img);
        $img->show;
        
    #will auto expand ????
    #$vp->set_size_request($x,$y);
    
    $vp->set_size_request(.9*$x,.9*$y);
    
    $vp->show; 
    
}
############################################
sub event_after {
  my ($mw, $event) = @_;

  return FALSE unless $event->type eq 'configure'; 
#  print $event->type,"\n"; 
  #return FALSE unless $event->button == 1;
  my ($x, $y) = $mw->get_size;
   print  "$x $y\n";

   get_svg($x,$y);

  return FALSE;
}
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