composite: Factor out backing store transition
No functional change. Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Adam Jackson <ajax@redhat.com>
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@ -105,6 +105,20 @@ compInstallColormap(ColormapPtr pColormap)
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pScreen->InstallColormap = compInstallColormap;
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}
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static void
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compCheckBackingStore(WindowPtr pWin)
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{
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if (pWin->backingStore != NotUseful && !pWin->backStorage) {
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compRedirectWindow(serverClient, pWin, CompositeRedirectAutomatic);
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pWin->backStorage = TRUE;
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}
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else if (pWin->backingStore == NotUseful && pWin->backStorage) {
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compUnredirectWindow(serverClient, pWin,
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CompositeRedirectAutomatic);
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pWin->backStorage = FALSE;
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}
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}
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/* Fake backing store via automatic redirection */
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static Bool
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compChangeWindowAttributes(WindowPtr pWin, unsigned long mask)
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@ -117,17 +131,8 @@ compChangeWindowAttributes(WindowPtr pWin, unsigned long mask)
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ret = pScreen->ChangeWindowAttributes(pWin, mask);
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if (ret && (mask & CWBackingStore) &&
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pScreen->backingStoreSupport != NotUseful) {
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if (pWin->backingStore != NotUseful && !pWin->backStorage) {
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compRedirectWindow(serverClient, pWin, CompositeRedirectAutomatic);
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pWin->backStorage = TRUE;
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}
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else if (pWin->backingStore == NotUseful && pWin->backStorage) {
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compUnredirectWindow(serverClient, pWin,
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CompositeRedirectAutomatic);
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pWin->backStorage = FALSE;
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}
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}
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pScreen->backingStoreSupport != NotUseful)
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compCheckBackingStore(pWin);
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pScreen->ChangeWindowAttributes = compChangeWindowAttributes;
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