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  Arguments
 
    x, y       Viewport coordinates of pixel
 
    wx, wy     Window coordinates of pixel
 
  Return
 
    Integer    Color index of the pixel if successful;
               otherwise -1
 
  Description
 
    The _GetPixel functions determine the pixel value (color index) at
    a specified location. _GetPixel uses viewport coordinates (x,y).
    _GetPixel_w uses window coordinates (wx,wy). The range of possible
    pixel values and corresponding color values are determined by the
    current graphics mode and palette settings.
 
    The function fails if the point lies outside the clipping region,
    or if the function is called in a text mode.
 
  _GrStatus Returns
 
    _GrError, _GrNotInProperMode