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     The _setpixel and _setpixel_w functions set to the current color a
     pixel at a specified location.
 
     The _setpixel function sets the color of the pixel at the
     view-coordinate point (x, y).
 
     The _setpixel_w function sets the color of the pixel at the
     window-coordinate point (wx, wy). This routine is implemented as a
     macro.
 
     Return Value
 
     The functions return the previous value of the target pixel. If
     the function fails (for example, the point lies outside the
     clipping region), it will return -1.
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