</p><p>
            <code class="function">glCompressedTexSubImage1D</code> redefines a contiguous subregion of an existing one-dimensional
            texture image.  The texels referenced by <em class="parameter"><code>data</code></em> replace the portion of the
            existing texture array with x indices <em class="parameter"><code>xoffset</code></em> and
            <math overflow="scroll">

                <mrow>
                    <mi mathvariant="italic">xoffset</mi>
                    <mo>+<