`TFPReaderHEIF`
pt		InternalCheck
pt		InternalRead
pt		InternalBeginFrames
pt		InternalReadFrame
pt		InternalEndFrames
		Create
		Destroy

`TFPCustomImageReader`
pt		InternalRead
pt		InternalCheck
pt		InternalSize
pt		InternalBeginFrames
pt		InternalReadFrame
pt		InternalEndFrames
		Create
		ImageRead
		CheckContents
		ImageSize
		BeginFrames
		ReadNextFrame
		EndFrames

`TFPCustomImageHandler`
pt		Progress
		Create