/**
* {@inheritdoc}
*/
public function offsetUnset($offset)
{
try {
$this->extractAt($offset);
} catch (RuntimeException $e) {
return;
}
try {
$this->resource->setimageindex($offset);
$this->resource->removeimage();
} catch (\GmagickException $e) {
throw new RuntimeException('Unable to remove layer', $e->getCode(), $e);
}
}
