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putimage Functions
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The putimage subroutines transfer to the screen the image stored in
the buffer pointed to by <image>.
In the putimage subroutine, the upper left corner of the image is
placed at the view-coordinate point (<x>, <y>). In the putimage_w
routine, the upper left corner of the image is placed at the
window-coordinate point (<wx>, <wy>).
The <action> argument defines the interaction between the stored
image and the one already on the screen. It may be any one of the
following symbolic constants (defined in FGRAPH.FD): $GAND, $GOR,
$GPRESET, $GPSET, or $GXOR.
Return Value
None.
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