Remove the PaintWindow optimization.

This was an attempt to avoid scratch gc creation and validation for paintwin
because that was expensive.  This is not the case in current servers, and the
danger of failure to implement it correctly (as seen in all previous
implementations) is high enough to justify removing it.  No performance
difference detected with x11perf -create -move -resize -circulate on Xvfb.
Leave the screen hooks for PaintWindow* in for now to avoid ABI change.

1 files changed, 7 insertions, 53 deletions

diff --git a/mi/miexpose.c b/mi/miexpose.c
index e82a0b573..03d4c27e0 100644
--- a/mi/miexpose.c
+++ b/mi/miexpose.c
@@ -307,8 +307,7 @@ miHandleExposures(pSrcDrawable, pDstDrawable,
 	    /* PaintWindowBackground doesn't clip, so we have to */
 	    REGION_INTERSECT(pscr, &rgnExposed, &rgnExposed, &pWin->clipList);
 	}
-	(*pWin->drawable.pScreen->PaintWindowBackground)(
-			(WindowPtr)pDstDrawable, &rgnExposed, PW_BACKGROUND);
+	miPaintWindow((WindowPtr)pDstDrawable, &rgnExposed, PW_BACKGROUND);
 
 	if (extents)
 	{
@@ -517,7 +516,7 @@ miWindowExposures(pWin, prgn, other_exposed)
 	    REGION_INTERSECT( pWin->drawable.pScreen, prgn, prgn, &pWin->clipList);
 	}
 	if (prgn && !REGION_NIL(prgn))
-	    (*pWin->drawable.pScreen->PaintWindowBackground)(pWin, prgn, PW_BACKGROUND);
+	    miPaintWindow(pWin, prgn, PW_BACKGROUND);
 	if (clientInterested && exposures && !REGION_NIL(exposures))
 	    miSendExposures(pWin, exposures,
 			    pWin->drawable.x, pWin->drawable.y);
@@ -534,60 +533,13 @@ miWindowExposures(pWin, prgn, other_exposed)
 	REGION_DESTROY( pWin->drawable.pScreen, exposures);
 }
 
-
-/*
-    this code is highly unlikely.  it is not haile selassie.
-
-    there is some hair here.  we can't just use the window's
-clip region as it is, because if we are painting the border,
-the border is not in the client area and so we will be excluded
-when we validate the GC, and if we are painting a parent-relative
-background, the area we want to paint is in some other window.
-since we trust the code calling us to tell us to paint only areas
-that are really ours, we will temporarily give the window a
-clipList the size of the whole screen and an origin at (0,0).
-this more or less assumes that ddX code will do translation
-based on the window's absolute position, and that ValidateGC will
-look at clipList, and that no other fields from the
-window will be used.  it's not possible to just draw
-in the root because it may be a different depth.
-
-to get the tile to align correctly we set the GC's tile origin to
-be the (x,y) of the window's upper left corner, after which we
-get the right bits when drawing into the root.
-
-because the clip_mask is being set to None, we may call DoChangeGC with
-fPointer set true, thus we no longer need to install the background or
-border tile in the resource table.
-*/
-
-static RESTYPE ResType = 0;
-static int numGCs = 0;
-static GCPtr	screenContext[MAXSCREENS];
-
-/*ARGSUSED*/
-static int
-tossGC (
-    pointer value,
-    XID id)
-{
-    GCPtr pGC = (GCPtr)value;
-    screenContext[pGC->pScreen->myNum] = (GCPtr)NULL;
-    FreeGC (pGC, id);
-    numGCs--;
-    if (!numGCs)
-	ResType = 0;
-
-    return 0;
-}
-
 _X_EXPORT void
 miPaintWindow(WindowPtr pWin, RegionPtr prgn, int what)
 {
     ScreenPtr	pScreen = pWin->drawable.pScreen;
     ChangeGCVal gcval[5];
     BITS32	gcmask;
-    PixmapPtr	pPixmap = (*pScreen->GetWindowPixmap) (pWin);
+    PixmapPtr	pPixmap;
     GCPtr	pGC;
     int		i;
     BoxPtr	pbox;
@@ -595,8 +547,7 @@ miPaintWindow(WindowPtr pWin, RegionPtr prgn, int what)
     int		numRects;
     int		xoff, yoff;
 
-    while (pWin->backgroundState == ParentRelative)
-        pWin = pWin->parent;
+    pPixmap = (*pScreen->GetWindowPixmap) (pWin);
 
 #ifdef COMPOSITE
     xoff = -pPixmap->screen_x;
@@ -610,6 +561,9 @@ miPaintWindow(WindowPtr pWin, RegionPtr prgn, int what)
 
     if (what == PW_BACKGROUND)
     {
+	while (pWin->backgroundState == ParentRelative)
+	    pWin = pWin->parent;
+
 	switch (pWin->backgroundState) {
 	case None:
 	    return;