Factor out ImageMagick wrapper.

1 files changed, 68 insertions, 0 deletions

diff --git a/perllib/FixMyStreet/ImageMagick.pm b/perllib/FixMyStreet/ImageMagick.pm
new file mode 100644
index 000000000..26c5c6d74
--- /dev/null
+++ b/perllib/FixMyStreet/ImageMagick.pm
@@ -0,0 +1,68 @@
+package FixMyStreet::ImageMagick;
+
+use Moo;
+
+my $IM = eval {
+    require Image::Magick;
+    Image::Magick->import;
+    1;
+};
+
+has blob => ( is => 'ro' );
+
+has image => (
+    is => 'rwp',
+    lazy => 1,
+    default => sub {
+        my $self = shift;
+        return unless $IM;
+        my $image = Image::Magick->new;
+        $image->BlobToImage($self->blob);
+        return $image;
+    },
+);
+
+sub strip {
+    my $self = shift;
+    return $self unless $self->image;
+    $self->image->Strip();
+    return $self;
+}
+
+sub rotate {
+    my ($self, $direction) = @_;
+    return $self unless $self->image;
+    my $err = $self->image->Rotate($direction);
+    return 0 if $err;
+    return $self;
+}
+
+# Shrinks a picture to the specified size, but keeping in proportion.
+sub shrink {
+    my ($self, $size) = @_;
+    return $self unless $self->image;
+    my $err = $self->image->Scale(geometry => "$size>");
+    throw Error::Simple("resize failed: $err") if "$err";
+    return $self->strip;
+}
+
+# Shrinks a picture to 90x60, cropping so that it is exactly that.
+sub crop {
+    my $self = shift;
+    return $self unless $self->image;
+    my $err = $self->image->Resize( geometry => "90x60^" );
+    throw Error::Simple("resize failed: $err") if "$err";
+    $err = $self->image->Extent( geometry => '90x60', gravity => 'Center' );
+    throw Error::Simple("resize failed: $err") if "$err";
+    return $self->strip;
+}
+
+sub as_blob {
+    my $self = shift;
+    return $self->blob unless $self->image;
+    my @blobs = $self->image->ImageToBlob();
+    $self->_set_image(undef);
+    return $blobs[0];
+}
+
+1;