`TFPReaderPNM`
pt		ReadHeader
pt		InternalCheck
pt		InternalRead
pt		ReadScanLine
pt		WriteScanLine

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

`TFPCustomImageHandler`
pt		Progress
		Create