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present: disable page flip only when a slave crtc is active 

This prevents the tearing of moving window in a composite WM
desktop when output slave is attached but none of its crtc is
really active.

Signed-off-by: Qiang Yu <Qiang.Yu@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
This commit is contained in:
Qiang Yu 2017-01-26 18:13:53 +08:00 committed by Michel Dänzer
parent 45e0eb4b15
commit bb9128fdc8
1 changed files with 13 additions and 1 deletions
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14
present/present.c
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@ -117,6 +117,18 @@ present_flip_pending_pixmap(ScreenPtr screen)
return screen_priv->flip_pending->pixmap;
}
static Bool
present_check_output_slaves_active(ScreenPtr pScreen)
{
ScreenPtr pSlave;
xorg_list_for_each_entry(pSlave, &pScreen->slave_list, slave_head) {
if (RRHasScanoutPixmap(pSlave))
return TRUE;
}
return FALSE;
}
static Bool
present_check_flip(RRCrtcPtr crtc,
WindowPtr window,
@ -145,7 +157,7 @@ present_check_flip(RRCrtcPtr crtc,
return FALSE;
/* Fail to flip if we have slave outputs */
if (screen->output_slaves)
if (screen->output_slaves && present_check_output_slaves_active(screen))
return FALSE;
/* Make sure the window hasn't been redirected with Composite */