MirOS Manual: glPixelZoom(3)

GLPIXELZOOM(3G)     UNIX Programmer's Manual      GLPIXELZOOM(3G)


     glPixelZoom - specify the pixel zoom factors


     void glPixelZoom( GLfloat xfactor,
                       GLfloat yfactor )


     xfactor, 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

                  (xr + n.xfactor, yr + m.yfactor)

               (xr + (n+1).xfactor, yr + (m+1).yfactor)

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

     Pixel zoom factors are not limited to positive values. Nega-
     tive 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 exe-
     cution of glEnd.


     glGet with argument GL_ZOOM_X
     glGet with argument GL_ZOOM_Y


     glCopyPixels(3G), glDrawPixels(3G)

MirOS BSD #10-current  Printed 03.04.2017                       1

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