Expanded class hierarchy of OptiPngFilter

class \Assetic\Filter\BaseProcessFilter implements FilterInterface
- class \Assetic\Filter\BaseNodeFilter
- class \Assetic\Filter\CompassFilter implements DependencyExtractorInterface
- class \Assetic\Filter\CssEmbedFilter implements DependencyExtractorInterface
- class \Assetic\Filter\DartFilter
- class \Assetic\Filter\GssFilter
- class \Assetic\Filter\JpegoptimFilter
- class \Assetic\Filter\JpegtranFilter
- class \Assetic\Filter\OptiPngFilter
- class \Assetic\Filter\PngoutFilter
- class \Assetic\Filter\Sass\SassFilter implements DependencyExtractorInterface
- class \Assetic\Filter\SprocketsFilter implements DependencyExtractorInterface
- class \Assetic\Filter\Yui\BaseCompressorFilter