composite: Wrap GetSpans

GetSpans should flush composition from children to parent, just like
GetImage and SourceValidate.  Fortunately no one is likely to have
noticed, since to hit this you're already deep into failure town.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

composite/compinit.c

@@ -78,6 +78,7 @@ compCloseScreen(ScreenPtr pScreen)
     pScreen->PositionWindow = cs->PositionWindow;
 
     pScreen->GetImage = cs->GetImage;
+    pScreen->GetSpans = cs->GetSpans;
     pScreen->SourceValidate = cs->SourceValidate;
 
     free(cs);
@@ -150,6 +151,21 @@ compGetImage(DrawablePtr pDrawable,
     pScreen->GetImage = compGetImage;
 }
 
+static void
+compGetSpans(DrawablePtr pDrawable, int wMax, DDXPointPtr ppt, int *pwidth,
+             int nspans, char *pdstStart)
+{
+    ScreenPtr pScreen = pDrawable->pScreen;
+    CompScreenPtr cs = GetCompScreen(pScreen);
+
+    pScreen->GetSpans = cs->GetSpans;
+    if (pDrawable->type == DRAWABLE_WINDOW)
+        compPaintChildrenToWindow((WindowPtr) pDrawable);
+    (*pScreen->GetSpans) (pDrawable, wMax, ppt, pwidth, nspans, pdstStart);
+    cs->GetSpans = pScreen->GetSpans;
+    pScreen->GetSpans = compGetSpans;
+}
+
 static void
 compSourceValidate(DrawablePtr pDrawable,
                    int x, int y,
@@ -432,6 +448,9 @@ compScreenInit(ScreenPtr pScreen)
     cs->GetImage = pScreen->GetImage;
     pScreen->GetImage = compGetImage;
 
+    cs->GetSpans = pScreen->GetSpans;
+    pScreen->GetSpans = compGetSpans;
+
     cs->SourceValidate = pScreen->SourceValidate;
     pScreen->SourceValidate = compSourceValidate;
 

composite/compint.h

@@ -168,6 +168,7 @@ typedef struct _CompScreen {
     CompOverlayClientPtr pOverlayClients;
 
     GetImageProcPtr GetImage;
+    GetSpansProcPtr GetSpans;
     SourceValidateProcPtr SourceValidate;
 } CompScreenRec, *CompScreenPtr;