How can I use FMX.

How can I use FMX.Filter.TFilter on a TBitmap? I roll my own tile-based canvas painting. If a tile in correct resolution is not yet loaded I'll draw a low res version until the wanted tile is loaded. It would be nice if the blown up low res tile was blurred. FMX can blur a TImage efficiently via the GPU, but I want to do this with a TBitmap.