`TFPWriterPNG`
pt	ro	Header
pt	ro	ChunkDataBuffer
pt	ro	UsetRNS
pt	ro	SingleTransparentColor
pt	ro	SingleTransparentColorOk
pt	ro	ThePalette
pt	ro	ColorFormat
pt	ro	ColorFormatFunc
pt	ro	byteWidth
pt	ro	DatalineLength
		GrayScale
		Indexed
		CompressedText
		WordSized
		UseAlpha
		CompressionLevel

`TFPCustomImageWriter`

`TFPCustomImageHandler`
pt	ro	TheStream
pt	ro	TheImage