DRI2: handle offscreen drawables better at swap time

If a drawable isn't visible due to DPMS or redirection, we'll just blit
it rather than schedule a swap event.  However, we didn't reset the
target_msc, so the swap target we receive from the server could get out
of sync with the vblank count of the drawable's display.  So at DPMS on
time, the swap target would be the last good vblank count plus some
large number (since the swaps won't have been throttled).

Solve this by zeroing out the swap target like we should when we fall
back to a blit.  Also make the kernel error cases more friendly by
making them fall back to blits too.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

0 files changed, 0 insertions, 0 deletions