              <math overflow="scroll"><mi mathvariant="italic">n</mi></math>
                        is the number of components or indices
                        in a pixel,
                        <math overflow="scroll"><mi mathvariant="italic">l</mi></math>
                        is the number of pixels in a row
                        (<code class="constant">GL_PACK_ROW_LENGTH</code> if it is greater than 0, the
                        <math overflow="scroll"><mi mathvariant="italic">width</mi></math