pt 

AssignTo (TPngTransparencyFormat2)

pt 

GetChunkSize (TCustomPngTransparency)

pt 

GetChunkSize (TPngTransparencyFormat2)

LoadFromStream (TCustomPngTransparency)

LoadFromStream (TPngTransparencyFormat2)

SaveToStream (TCustomPngTransparency)

SaveToStream (TPngTransparencyFormat2)