`TFPWriterPNG`
pt		InternalWrite
pt		WriteIHDR
pt		WritePLTE
pt		WritetRNS
pt		WriteIDAT
pt		WriteTexts
pt		WriteIEND
pt		CurrentLine
pt		PrevSample
pt		PreviousLine
pt		PrevLinePrevSample
pt		DoFilter
pt		SetChunkLength
pt		SetChunkType
pt		DecideGetPixel
pt		DetermineHeader
pt		DetermineFilter
pt		FillScanLine
pt		ColorDataGrayB
pt		ColorDataColorB
pt		ColorDataGrayW
pt		ColorDataColorW
pt		ColorDataGrayAB
pt		ColorDataColorAB
pt		ColorDataGrayAW
pt		ColorDataColorAW
		create
		destroy

`TFPCustomImageWriter`
pt		InternalWrite
		ImageWrite

`TFPCustomImageHandler`
pt		Progress
		Create