Only `bytesperrow` bytes are written to each row of the output rect.
Therefore the last row need not be padded to `cbStride` bytes.
Signed-off-by: Joachim Priesner <joachim.priesner@web.de>
Signed-off-by: Esme Povirk <esme@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>