Appeal No. 1998-0626
Application No. 08/593,114
previous state. If any information fields have changed, a
current value of each changed information field is recorded in
a uniquely identifiable location. The current state is then
recorded using a record specifying the current values of each
changed information field by reference to the uniquely
identifiable location. Image capture is thereby accomplished.
(Specification page 4, line 28 to page 5, line 13.)
Independent claims 5 is reproduced as follows:
5. Using a computer having a memory system, a method for
use in producing a graphic image using a set of graphics
primitives each of which is executed in accordance with a
current state of a graphics environment at a time when a
command invoking the graphics primitive was received, the
current state of the graphics environment including a
plurality of state elements and being changed at times by an
image source, the method comprising the steps of:
each time a state element has changed from when a
previous command involving a graphics primitive was received
to when a current command involving a graphics primitive was
received:
saving in the memory system an instance of that state
element containing current information for that state element;
and
saving in the memory system a graphics state object
including for each of said plurality of state elements a
pointer to a most recently saved instance of that state
element;
wherein each graphics state object includes a pointer to
only one instance of a given state element, and at least some
2
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