andreacavalli/xserver-multidpi
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composite: Don't backfill non-bg-None windows

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If there's a defined background then backfilling is a waste of effort,
since exposure processing will paint that in for us.  But note that we
have to backfill if any children are bg=None to preserve semantics with
non-composited servers.

Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Adam Jackson 2010-10-18 15:50:37 -04:00
parent d2064fbb68
commit 6dd775f57d
1 changed files with 23 additions and 1 deletions
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24
composite/compalloc.c
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@ -472,6 +472,17 @@ compUnredirectOneSubwindow (WindowPtr pParent, WindowPtr pWin)
return Success;
}
static int
bgNoneVisitWindow(WindowPtr pWin, void *null)
{
if (pWin->backgroundState != BackgroundPixmap)
return WT_WALKCHILDREN;
if (pWin->background.pixmap != None)
return WT_WALKCHILDREN;
return WT_STOPWALKING;
}
static PixmapPtr
compNewPixmap (WindowPtr pWin, int x, int y, int w, int h)
{
@ -487,7 +498,18 @@ compNewPixmap (WindowPtr pWin, int x, int y, int w, int h)
pPixmap->screen_x = x;
pPixmap->screen_y = y;
/*
* If there's no bg=None in the tree, we're done.
*
* We could optimize this more by collection the regions of all the
* bg=None subwindows and feeding that in as the clip for the
* CopyArea below, but since window trees are shallow these days it
* might not be worth the effort.
*/
if (TraverseTree(pWin, bgNoneVisitWindow, NULL) == WT_NOMATCH)
return pPixmap;
if (pParent->drawable.depth == pWin->drawable.depth)
{
GCPtr pGC = GetScratchGC (pWin->drawable.depth, pScreen);