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package CGI::Uploader::Transform::ImageMagick;
use base 'Exporter';
use File::Temp 'tempfile';
use Params::Validate ':all';
use Carp::Assert;
use vars qw(@EXPORT $VERSION);
$VERSION = 2.17;
@EXPORT = qw(&gen_thumb);
=head2 gen_thumb()
use CGI::Uploader::Transform::ImageMagick;
As a class method:
($thumb_tmp_filename) = CGI::Uploader::Transform::ImageMagick->gen_thumb({
filename => $orig_filename,
w => $width,
h => $height
});
Within a CGI::Uploader C<spec>:
gen_files => {
my_thumb => gen_thumb({ w => $width, h => $height }),
}
Looking for a different syntax? See L<BACKWARDS COMPATIBILITY>
This function creates a copy of given image file and resizes the copy to the
provided width and height.
C<gen_thumb> can be called as object or class method. As a class method,
there there is no need to call C<new()> before calling this method.
L<Graphics::Magick> is used as the first choice image service module.
L<Image::Magick> is tried next.
Input:
filename - filename of source image
w - max width of thumbnail
h - max height of thumbnail
One or both of C<w> or C<h> is required.
Output:
- filename of generated tmp file for the thumbnail
- the initialized image generation object. (You generally shouldn't need this)
=cut
sub gen_thumb {
# If the first arg is an object, we have really work to do right now
my $first_arg = $_[0];
use Scalar::Util (qw/blessed/);
if ((blessed $first_arg) or (eval {$first_arg->can('gen_thumb')})) {
return _really_gen_thumb(@_);
}
# Otherwise, just generate a closure pass back a code ref for later use
else {
# require a single hashref as input
my ($args_href) = validate_pos(@_, { type => HASHREF });
return sub {
my $self = shift;
my $filename = shift;
_really_gen_thumb($self, {
filename => $filename,
%$args_href,
});
}
}
}
sub _really_gen_thumb {
my $self = shift || die "gen_thumb needs object";
my (%p,$orig_filename,$params);
# If we have the new hashref API
if (ref $_[0] eq 'HASH') {
%p = validate(@_,{
filename => { type => SCALAR },
w => { type => SCALAR | UNDEF, regex => qr/^\d*$/, optional => 1, },
h => { type => SCALAR | UNDEF, regex => qr/^\d*$/, optional => 1 },
});
$orig_filename = $p{filename};
}
# we have the old ugly style API
else {
($orig_filename, $params) = validate_pos(@_,1,{ type => ARRAYREF });
# validate handles a hash or hashref transparently
%p = validate(@$params,{
w => { type => SCALAR | UNDEF, regex => qr/^\d*$/, optional => 1, },
h => { type => SCALAR | UNDEF, regex => qr/^\d*$/, optional => 1 },
});
}
die "must supply 'w' or 'h'" unless (defined $p{w} or defined $p{h});
# Having both Graphics::Magick and Image::Magick loaded at the same time
# can cause very strange problems, so we take care to avoid that
# First see if we have already loaded Graphics::Magick or Image::Magick
# If so, just use whichever one is already loaded.
my $magick_module;
if (exists $INC{'Graphics/Magick.pm'}) {
$magick_module = 'Graphics::Magick';
}
elsif (exists $INC{'Image/Magick.pm'}) {
$magick_module = 'Image::Magick';
}
# If neither are already loaded, try loading either one.
elsif ( _load_magick_module('Graphics::Magick') ) {
$magick_module = 'Graphics::Magick';
}
elsif ( _load_magick_module('Image::Magick') ) {
$magick_module = 'Image::Magick';
}
else {
die "No graphics module found for image resizing. Install Graphics::Magick or Image::Magick: $@ "
}
my ($thumb_tmp_fh, $thumb_tmp_filename) = tempfile('CGIuploaderXXXXX', UNLINK => 1, DIR => $self->{'temp_dir'});
binmode($thumb_tmp_fh);
my $img = $magick_module->new();
my $err;
eval {
$err = $img->Read(filename=>$orig_filename);
die "Error while reading $orig_filename: $err" if $err;
my ($target_w,$target_h) = _calc_target_size($img,$p{w},$p{h});
$err = $img->Resize($target_w.'x'.$target_h);
die "Error while resizing $orig_filename: $err" if $err;
$err = $img->Write($thumb_tmp_filename);
die "Error while writing $orig_filename: $err" if $err;
};
if ($@) {
warn $@;
my $code;
# codes > 400 are fatal
die $err if ((($code) = $err =~ /(\d+)/) and ($code > 400));
}
assert ($thumb_tmp_filename, 'thumbnail tmp file created');
return wantarray ? ($thumb_tmp_filename, $img ) : $thumb_tmp_filename;
}
# Calculate the target with height
#
# my ($target_w,$target_h) = _calc_target_size($img,$p{w},$p{h})
#
# Input:
#
# - Magick object, pre-opened with the original file
# - provided width
# - provided height
sub _calc_target_size {
my ($img,$w,$h) = @_;
my $target_h = $h;
my $target_w = $w;
my ($orig_w,$orig_h) = $img->Get('width','height');
$target_h = sprintf("%.1d", ($orig_h * $target_w) / $orig_w) unless $target_h;
$target_w = sprintf("%.1d", ($orig_w * $target_h) / $orig_h) unless $target_w;
return ($target_w,$target_h);
}
# load Graphics::Magick or Image::Magick if one is not already loaded.
sub _load_magick_module {
my $module_name = shift;
return eval "require $module_name";
}
=head2 BACKWARDS COMPATIBILITY
These older, more awkward syntaxes are still supported:
As a class method:
($thumb_tmp_filename) = CGI::Uploader::Transform::ImageMagick->gen_thumb(
$orig_filename,
[ w => $width, h => $height ]
);
In a C<CGI::Uploader> C<spec>:
'my_img_field_name' => {
transform_method => \&gen_thumb,
params => [ w => 100, h => 100 ],
}
1;
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