r600_fmt_get_nblocksx
surf.nbx = r600_fmt_get_nblocksx(surf.format, surf.nbx);
surf.nbx = r600_fmt_get_nblocksx(surf.format, w);
nbx = r600_fmt_get_nblocksx(format, width);
tmp = r600_fmt_get_nblocksy(format, height) * r600_fmt_get_nblocksx(format, pitch) *
pitch, height, r600_fmt_get_nblocksx(format, pitch),
int r600_fmt_get_nblocksx(u32 format, u32 w);