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services:
  class: ChubProduction\Bundle\SiteBundle\Imagine\CroppedThumbFilterLoader
    tags:
      - { name: imagine.filter.loader, filter: crop_thumb}

<img src="{{ asset(photo.url)|apply_filter('gallery_cropped') }}" />

avalanche_imagine:
  filters:
    gallery_cropped:
      type:    crop_thumb
      options: { size: [200, 200] }

<?php
namespace ChubProduction\Bundle\SiteBundle\Imagine;

use Imagine\Image\Box;
use Imagine\Image\Point;
use Imagine\Filter\Transformation;
use Avalanche\Bundle\ImagineBundle\Imagine\Filter\Loader\LoaderInterface;
use Imagine\Image\ManipulatorInterface;

/**
 * CroppedThumbFilter
 *
 * @author Vladimir Chub <v@chub.com.ua>
 */
class CroppedThumbFilterLoader implements LoaderInterface
{
	public function load(array $options = array())
	{
		list($width, $height) = $options['size'];

		$transformation = new Transformation();
		$box = new Box($width, $height);
		$transformation->thumbnail($box, ManipulatorInterface::THUMBNAIL_OUTBOUND)
						->crop(new Point(0, 0), $box);

		return $transformation;
	}
}