Imager::GIF - a handy module for animated GIF processing
- is a nice thought, with one semi-working method and problematic
documentation (
Re^2: Imager::GIF seems broken),
that needs some help, as the docs say:
TODO
Implement the rest of the transformations (cropping, rotating etc).
I needed to non-proportionally scale animated GIFs
and implemented type=>nonprop in the scale method.
Other desirable features include crop, watermark,
and sharpening. Please share your mods and methods
here.
TODO:
https://metacpan.org/pod/distribution/Imager/lib/Imager/Transformations.pod
https://metacpan.org/pod/distribution/Imager/lib/Imager/Filters.pod
Your local file:
perl -MImager::GIF -le 'for (keys %INC) { print $INC{$_} if /GIF\.pm/
+}'
My scale method:
sub scale {
my ($self, %args) = @_;
my $ratio = $args{scalefactor} // 1;
my $qtype = $args{qtype} // 'mixing'; # add qtype support
$self->_mangle(sub {
my $img = shift;
my $ret = $img->scale(%args, qtype => $qtype);
my $h = $img->tags(name => 'gif_screen_height');
my $w = $img->tags(name => 'gif_screen_width');
# add non-proportional scaling
if (
$args{xpixels} and
$args{ypixels} and
$args{type} and
$args{type} eq 'nonprop') {
my $xratio
= defined $args{xpixels}
? $args{xpixels} / $w
: $ratio;
my $yratio
= defined $args{ypixels}
? $args{ypixels} / $w
: $ratio;
$ret->settag(name => 'gif_left',
value => int($xratio * $img->tags(name => 'gif
+_left')));
$ret->settag(name => 'gif_top',
value => int($yratio * $img->tags(name => 'gif
+_top')));
$ret->settag(name => 'gif_screen_width', value => int($xr
+atio * $w));
$ret->settag(name => 'gif_screen_height', value => int($yr
+atio * $h));
}
else {
# proportional scaling, from the original
unless ($ratio) {
if (defined $args{xpixels}) {
$ratio = $args{xpixels} / $w;
}
if (defined $args{ypixels}) {
$ratio = $args{ypixels} / $h;
}
}
$ret->settag(name => 'gif_left',
value => int($ratio * $img->tags(name => 'gif
+_left')));
$ret->settag(name => 'gif_top',
value => int($ratio * $img->tags(name => 'gif
+_top')));
$ret->settag(name => 'gif_screen_width', value => int($ra
+tio * $w));
$ret->settag(name => 'gif_screen_height', value => int($ra
+tio * $h));
}
return $ret;
});
}
Thank you!