`TFPReaderPNG`
pt	ro	ConvertColor
pt	ro	CurrentPass
pt	ro	Pltte
pt	ro	ThePalette
pt	ro	Header
pt	ro	CountScanlines
pt	ro	ScanLineLength
	ro	GrayScale
	ro	WordSized
	ro	Indexed
	ro	UseAlpha
	ro	BitDepth
	ro	ColorType
	ro	Compression
	ro	Filter
	ro	Interlace

`TFPCustomImageReader`
		DefaultImageClass

`TFPCustomImageHandler`
pt	ro	TheStream
pt	ro	TheImage