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present: fix msc offset calculation in window mode 

Instead of getting the current msc value from the window, which might be
different to old one directly take the last saved msc value saved in
the window_priv struct.

Signed-off-by: Roman Gilg <subdiff@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Roman Gilg 2018-04-20 17:10:06 +02:00 committed by Adam Jackson
parent d7297b0044
commit 22285a6f1c
1 changed files with 1 additions and 6 deletions
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7
present/present_wnmd.c
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@ -518,8 +518,6 @@ present_wnmd_window_to_crtc_msc(WindowPtr window, RRCrtcPtr crtc, uint64_t windo
present_window_priv_ptr window_priv = present_get_window_priv(window, TRUE);
if (crtc != window_priv->crtc) {
uint64_t old_ust, old_msc;
if (window_priv->crtc == PresentCrtcNeverSet) {
window_priv->msc_offset = 0;
} else {
@ -527,10 +525,7 @@ present_wnmd_window_to_crtc_msc(WindowPtr window, RRCrtcPtr crtc, uint64_t windo
* we'll just use whatever previous MSC we'd seen from this CRTC
*/
if (present_wnmd_get_ust_msc(window->drawable.pScreen, window, &old_ust, &old_msc) != Success)
old_msc = window_priv->msc;
window_priv->msc_offset += new_msc - old_msc;
window_priv->msc_offset += new_msc - window_priv->msc;
}
window_priv->crtc = crtc;
}