Use LiipImagineBundle without filters - symfony

Question

I'm using LiipImagineBundle in my Symfony2 project and everything is working great. I've defined a thumbnail filter:
<img src="{{ 'bundles/app/images/home/warning.jpg'|imagine_filter('thumb_home') }}" alt="Warning" />
And it works perfectly, but some of my images don't need any filter, so I've tried to remove the filter:
<img src="{{ 'bundles/app/images/home/warning.jpg'|imagine_filter('') }}" alt="Warning" />
<img src="{{ 'bundles/app/images/home/warning.jpg'|imagine_filter() }}" alt="Warning" />
**edited to correct the example as malcolm points out
But it doesn't work, so I need to use Assetic for these images:
{% image '#AppBundle/Resources/public/images/example.jpg' %}
<img src="{{ asset_url }}" alt="Example" />
{% endimage %}
I can't find in the documentation of the bundle any option which allows me to use the Bundle without filters. Is that true? Of course, I can use the LiipImagineBundle way to include images when they need a filter and the Assetic way when they don't, but switching between two different ways of achieving almost the same thing is pretty annoying.

Answer 1

Silly answer to your question - create an original size filter then :). Something like this:
class OriginalSizeFilter implements LoaderInterface
{
public function load(ImageInterface $image, array $options = [])
{
$size = $image->getSize();
$origWidth = $size->getWidth();
$origHeight = $size->getHeight();
$filter = new Thumbnail(new Box($origWidth, $origHeight));
$image = $filter->apply($image);
return $image;
}
}
service:
original_size_filter:
class: ...\OriginalSizeFilter
tags:
- { name: liip_imagine.filter.loader, loader: original_size_filter }
config.yml:
filter_sets:
original:
filters:
original_size_filter: ~
Usage:
<img src="{{ 'bundles/app/images/home/warning.jpg'|imagine_filter('original') }}" alt="Warning" />
But, why not use a asset() function if you don't want any filters to be applied?