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composite: Factor out backing store transition 

No functional change.

Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2015-02-25 16:03:13 -05:00
parent 6da3f5d04f
commit b469fc72d2
1 changed files with 16 additions and 11 deletions
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27
composite/compinit.c
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@ -105,6 +105,20 @@ compInstallColormap(ColormapPtr pColormap)
pScreen->InstallColormap = compInstallColormap; pScreen->InstallColormap = compInstallColormap;
} }
static void
compCheckBackingStore(WindowPtr pWin)
{
if (pWin->backingStore != NotUseful && !pWin->backStorage) {
compRedirectWindow(serverClient, pWin, CompositeRedirectAutomatic);
pWin->backStorage = TRUE;
}
else if (pWin->backingStore == NotUseful && pWin->backStorage) {
compUnredirectWindow(serverClient, pWin,
CompositeRedirectAutomatic);
pWin->backStorage = FALSE;
}
}
/* Fake backing store via automatic redirection */ /* Fake backing store via automatic redirection */
static Bool static Bool
compChangeWindowAttributes(WindowPtr pWin, unsigned long mask) compChangeWindowAttributes(WindowPtr pWin, unsigned long mask)
@ -117,17 +131,8 @@ compChangeWindowAttributes(WindowPtr pWin, unsigned long mask)
ret = pScreen->ChangeWindowAttributes(pWin, mask); ret = pScreen->ChangeWindowAttributes(pWin, mask);
if (ret && (mask & CWBackingStore) && if (ret && (mask & CWBackingStore) &&
pScreen->backingStoreSupport != NotUseful) { pScreen->backingStoreSupport != NotUseful)
if (pWin->backingStore != NotUseful && !pWin->backStorage) { compCheckBackingStore(pWin);
compRedirectWindow(serverClient, pWin, CompositeRedirectAutomatic);
pWin->backStorage = TRUE;
}
else if (pWin->backingStore == NotUseful && pWin->backStorage) {
compUnredirectWindow(serverClient, pWin,
CompositeRedirectAutomatic);
pWin->backStorage = FALSE;
}
}
pScreen->ChangeWindowAttributes = compChangeWindowAttributes; pScreen->ChangeWindowAttributes = compChangeWindowAttributes;