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An imageclass object contains an Image structure that Intuition uses to
render objects such as gadgets.  Boopsi imageclass objects are organized
so that when NewObject() returns a pointer to an imageclass object, it
points to the actual Image structure.

Normally, an application does not create an imageclass object.  Instead,
it will use a subclass of imageclass.  Currently, there are four
subclasses:  frameiclass, sysiclass, fillrectclass, and itexticlass.

frameiclass - An embossed or recessed rectangular frame, rendered in the
  proper DrawInfo pens, with enough intelligence to bound or center its

sysiclass - The class of system images.  The class includes all the
  images for the system gadgets, and the Gadtools check mark and button

fillrectclass - Rectangle with frame and pattern support.

itexticlass - A specialized image class used for rendering text.  Note
  that you have to calculate itexticlass object's width and height

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