DrawBlock
ret = DrawBlock(av7110, av7110->osdwin, 0, 0, 720, 576, 0);
ret = DrawBlock(av7110, av7110->osdwin, 0, 0, 720, 576, dc->color);
ret = DrawBlock(av7110, av7110->osdwin, dc->x0, dc->y0,
ret = DrawBlock(av7110, av7110->osdwin, dc->x0, dc->y0,