/**
* Checks if the output of transform() for this file is likely
* to be valid. If this is false, various user elements will
* display a placeholder instead.
*
* Currently, this checks if the file is an image format
* that can be converted to a format
* supported by all browsers (namely GIF, PNG and JPEG),
* or if it is an SVG image and SVG conversion is enabled.
*
* @return bool
*/
function canRender()
{
if (!isset($this->canRender)) {
$this->canRender = $this->getHandler() && $this->handler->canRender($this);
}
return $this->canRender;
}
