In LibreOffice the shadows are just a copy of the object.
Currently, users can enable the shadow for the object, change its color, its angle, distance behind the object, and transparency.
We aim to add an additional feature to blur the shadow of the object. To add the feature to shadows that needs to add a blur attribute into the shadow attributes. We use this attribute to change the value of blurring that will be applied to the shadow through an already implemented algorithm in LibreOffice called BitmapFilterStackBlur.