glPixelZoom man page on DigitalUNIX

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glPixelZoom(3G)						       glPixelZoom(3G)

       glPixelZoom - specify the pixel zoom factors

       void glPixelZoom(
	       GLfloat xfactor,
	       GLfloat yfactor );

       Specify the x and y zoom factors for pixel write operations.

       glPixelZoom() specifies values for the x and y zoom factors. During the
       execution of glDrawPixels() or glCopyPixels(), if (xr ,	yr  )  is  the
       current	raster position, and a given element is in the mth row and nth
       column of the pixel rectangle, then pixels whose	 centers  are  in  the
       rectangle with corners at (xr + n cdot xfactor, yr + m . yfactor) (xr +
       (n+1) . xfactor, yr + (m+1) cdot yfactor)

       are candidates for replacement. Any pixel whose center lies on the bot‐
       tom or left edge of this rectangular region is also modified.

       Pixel  zoom  factors  are not limited to positive values. Negative zoom
       factors reflect the resulting image about the current raster position.

       GL_INVALID_OPERATION is generated if glPixelZoom() is executed  between
       the execution of glBegin() and the corresponding execution of glEnd().

       glGet() with argument GL_ZOOM_X
       glGet() with argument GL_ZOOM_Y

       glCopyPixels(3) ,glDrawPixels(3)


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