--
-- File:	AlienImage_AlienImage.cdl
-- Created:	23/03/93
-- Author:	BBL,JLF
--
---Copyright:	Matravision 1993
--

deferred class AlienImage from AlienImage inherits TShared from MMgt

	---Purpose: This class defines an Alien image.
	-- Alien Image is X11 .xwd image or SGI .rgb image for example

uses
	File  		from OSD,
	Image 		from Image

raises
	TypeMismatch 	from Standard

is
	Initialize ;

	Read ( me : in out mutable ; afile : in out File from OSD )
	  returns Boolean from Standard is deferred;
	---Level: Public
	---Purpose: Reads content of a  AlienImage object from a file .
	--         Returns True if file is a XWD file .

	Write( me : in immutable ; afile : in out File from OSD )
	  returns Boolean from Standard is deferred ;
	---Level: Public
	---Purpose: Writes content of a  AlienImage object to a file .

	ToImage  ( me : in immutable ) 
	  returns mutable Image from Image 
          raises TypeMismatch from Standard is deferred ;
	---Level: Public
	---Purpose : Converts a AlienImage object to a Image object.

	FromImage( me : in out mutable ; anImage : in Image from Image )
          raises TypeMismatch from Standard is deferred ;
	---Level: Public
	---Purpose : Converts a Image object to a AlienImage object.

end AlienImage;