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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _putimage functions transfer to the screen the image stored in
     the buffer pointed to by <image>.
 
     In the _putimage function, 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 _putimage_w routine is
     implemented as a macro.
 
     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 manifest constants (defined in GRAPH.H): _GAND, _GOR,
     _GPRESET, _GPSET, or _GXOR.
 
     Return Value
 
     None. Use the _grstatus function to check the result of a call to
     the _putimage functions.
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