Neat.

I think you could replace:

if ($pspec->get_name eq 'collapsed_box_height') {
    return $self->{collapsed_box_height};
} elsif ($pspec->get_name eq 'collapsed_box_width') {
    return $self->{collapsed_box_width};
} elsif ($pspec->get_name eq 'full_box_height') {
    return $self->{full_box_height};
} elsif ($pspec->get_name eq 'full_box_width') {
    return $self->{full_box_width};
} elsif ($pspec->get_name eq 'insets') {
    return $self->{insets};
} elsif ($pspec->get_name eq 'domdocument') {
    return $self->{domdocument};
} elsif ($pspec->get_name eq 'matrix') {
    return $self->{matrix};
} elsif ($pspec->get_name eq 'max_hori_distance') {
    return $self->{max_hori_distance};
} elsif ($pspec->get_name eq 'max_vert_distance') {
    return $self->{max_vert_distance};
}
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with something like:

my %props = map { $_->{name} => 1 } $self->list_properties;
return $self->{$pspec->get_name}
  if exists $props{$pspec->get_name};
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or even simply:

return $self->{$pspec->get_name}
  if exists $self->{$pspec->get_name};
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Most of SET_PROPERTY is like that too. And

my $draw = shift;
my $gc = shift;
my $text = shift;
my $x = shift;
my $y = shift;
my $w = shift;
my $h = shift;
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Yuck.

my ($draw, $gc, $text, $x, $y, $w, $h) = @_;
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or

my %args;
@args{qw(draw gc text x y w h)} = @_;
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