composite: use config notify hook to do pixmap resize.

Since reallocating the backing pixmap can fail, we need to try and do
it before any other side effects of reconfiguring the window happen.

This changes the ConfigNotify hook to return status, and moves the
composite window reconfiguration wrappers to ConfigNotify. They all
basically did the same thing, so we can drop the MoveWindow,
ResizeWindow, ChangeBorderWidth wrappers, and allow ConfigNotify to do
all the work. If reallocation fails we fail before we send any
confiureNotify events, or enter the area we can't recover from.

The only place we now enforce 32k limits are in EXA/UXA/fb, so drivers
that don't use this should probably deal with it in their pixmap
allocate if they don't already.

This also breaks ABI, so we need an alternate fix for older servers,
working on the X server makes me realise why I'm a kernel hacker.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

3 files changed, 54 insertions, 153 deletions

diff --git a/composite/compinit.c b/composite/compinit.c
index e4b68c822..b4deaf5e8 100644
--- a/composite/compinit.c
+++ b/composite/compinit.c
@@ -69,9 +69,7 @@ compCloseScreen (int index, ScreenPtr pScreen)
     pScreen->InstallColormap = cs->InstallColormap;
     pScreen->ChangeWindowAttributes = cs->ChangeWindowAttributes;
     pScreen->ReparentWindow = cs->ReparentWindow;
-    pScreen->MoveWindow = cs->MoveWindow;
-    pScreen->ResizeWindow = cs->ResizeWindow;
-    pScreen->ChangeBorderWidth = cs->ChangeBorderWidth;
+    pScreen->ConfigNotify = cs->ConfigNotify;
     
     pScreen->ClipNotify = cs->ClipNotify;
     pScreen->UnrealizeWindow = cs->UnrealizeWindow;
@@ -362,14 +360,8 @@ compScreenInit (ScreenPtr pScreen)
     cs->ClipNotify = pScreen->ClipNotify;
     pScreen->ClipNotify = compClipNotify;
 
-    cs->MoveWindow = pScreen->MoveWindow;
-    pScreen->MoveWindow = compMoveWindow;
-
-    cs->ResizeWindow = pScreen->ResizeWindow;
-    pScreen->ResizeWindow = compResizeWindow;
-
-    cs->ChangeBorderWidth = pScreen->ChangeBorderWidth;
-    pScreen->ChangeBorderWidth = compChangeBorderWidth;
+    cs->ConfigNotify = pScreen->ConfigNotify;
+    pScreen->ConfigNotify = compConfigNotify;
 
     cs->ReparentWindow = pScreen->ReparentWindow;
     pScreen->ReparentWindow = compReparentWindow;
diff --git a/composite/compint.h b/composite/compint.h
index 845a196f6..93da4dfa2 100644
--- a/composite/compint.h
+++ b/composite/compint.h
@@ -127,13 +127,9 @@ typedef struct _CompScreen {
     UnrealizeWindowProcPtr	UnrealizeWindow;
     ClipNotifyProcPtr		ClipNotify;
     /*
-     * Called from ConfigureWindow, these
-     * three track changes to the offscreen storage
-     * geometry
+     * Called from ConfigureWindow.
      */
-    MoveWindowProcPtr		MoveWindow;
-    ResizeWindowProcPtr		ResizeWindow;
-    ChangeBorderWidthProcPtr	ChangeBorderWidth;
+    ConfigNotifyProcPtr         ConfigNotify;
     /*
      * Reparenting has an effect on Subwindows redirect
      */
@@ -280,16 +276,6 @@ void
 compClipNotify (WindowPtr pWin, int dx, int dy);
 
 void
-compMoveWindow (WindowPtr pWin, int x, int y, WindowPtr pSib, VTKind kind);
-
-void
-compResizeWindow (WindowPtr pWin, int x, int y,
-		  unsigned int w, unsigned int h, WindowPtr pSib);
-
-void
-compChangeBorderWidth (WindowPtr pWin, unsigned int border_width);
-
-void
 compReparentWindow (WindowPtr pWin, WindowPtr pPriorParent);
 
 Bool
@@ -316,4 +302,8 @@ CompositeRealChildHead (WindowPtr pWin);
 int
 DeleteWindowNoInputDevices(pointer value, XID wid);
 
+int
+compConfigNotify(WindowPtr pWin, int x, int y, int w, int h,
+		 int bw, WindowPtr pSib);
+
 #endif /* _COMPINT_H_ */
diff --git a/composite/compwindow.c b/composite/compwindow.c
index 3b16bf980..0f3898cb3 100644
--- a/composite/compwindow.c
+++ b/composite/compwindow.c
@@ -335,132 +335,6 @@ compImplicitRedirect (WindowPtr pWin, WindowPtr pParent)
 }
 
 void
-compMoveWindow (WindowPtr pWin, int x, int y, WindowPtr pSib, VTKind kind)
-{
-    ScreenPtr		pScreen = pWin->drawable.pScreen;
-    CompScreenPtr	cs = GetCompScreen (pScreen);
-
-    compCheckTree (pScreen);
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	WindowPtr		pParent;
-	int			draw_x, draw_y;
-	unsigned int		w, h, bw;
-
-	/* if this is a root window, can't be moved */
-	if (!(pParent = pWin->parent))
-	   return;
-
-	bw = wBorderWidth (pWin);
-	draw_x = pParent->drawable.x + x + (int)bw;
-	draw_y = pParent->drawable.y + y + (int)bw;
-	w = pWin->drawable.width;
-	h = pWin->drawable.height;
-	compReallocPixmap (pWin, draw_x, draw_y, w, h, bw);
-    }
-    compCheckTree (pScreen);
-
-    pScreen->MoveWindow = cs->MoveWindow;
-    (*pScreen->MoveWindow) (pWin, x, y, pSib, kind);
-    cs->MoveWindow = pScreen->MoveWindow;
-    pScreen->MoveWindow = compMoveWindow;
-
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	CompWindowPtr	cw = GetCompWindow (pWin);
-	if (cw->pOldPixmap)
-	{
-	    (*pScreen->DestroyPixmap) (cw->pOldPixmap);
-	    cw->pOldPixmap = NullPixmap;
-	}
-    }
-
-    compCheckTree (pScreen);
-}
-
-void
-compResizeWindow (WindowPtr pWin, int x, int y,
-		  unsigned int w, unsigned int h, WindowPtr pSib)
-{
-    ScreenPtr		pScreen = pWin->drawable.pScreen;
-    CompScreenPtr	cs = GetCompScreen (pScreen);
-
-    compCheckTree (pScreen);
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	WindowPtr		pParent;
-	int			draw_x, draw_y;
-	unsigned int		bw;
-
-	/* if this is a root window, can't be moved */
-	if (!(pParent = pWin->parent))
-	   return;
-
-	bw = wBorderWidth (pWin);
-	draw_x = pParent->drawable.x + x + (int)bw;
-	draw_y = pParent->drawable.y + y + (int)bw;
-	compReallocPixmap (pWin, draw_x, draw_y, w, h, bw);
-    }
-    compCheckTree (pScreen);
-
-    pScreen->ResizeWindow = cs->ResizeWindow;
-    (*pScreen->ResizeWindow) (pWin, x, y, w, h, pSib);
-    cs->ResizeWindow = pScreen->ResizeWindow;
-    pScreen->ResizeWindow = compResizeWindow;
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	CompWindowPtr	cw = GetCompWindow (pWin);
-	if (cw->pOldPixmap)
-	{
-	    (*pScreen->DestroyPixmap) (cw->pOldPixmap);
-	    cw->pOldPixmap = NullPixmap;
-	}
-    }
-    compCheckTree (pWin->drawable.pScreen);
-}
-
-void
-compChangeBorderWidth (WindowPtr pWin, unsigned int bw)
-{
-    ScreenPtr		pScreen = pWin->drawable.pScreen;
-    CompScreenPtr	cs = GetCompScreen (pScreen);
-
-    compCheckTree (pScreen);
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	WindowPtr		pParent;
-	int			draw_x, draw_y;
-	unsigned int		w, h;
-
-	/* if this is a root window, can't be moved */
-	if (!(pParent = pWin->parent))
-	   return;
-
-	draw_x = pWin->drawable.x;
-	draw_y = pWin->drawable.y;
-	w = pWin->drawable.width;
-	h = pWin->drawable.height;
-	compReallocPixmap (pWin, draw_x, draw_y, w, h, bw);
-    }
-    compCheckTree (pScreen);
-
-    pScreen->ChangeBorderWidth = cs->ChangeBorderWidth;
-    (*pScreen->ChangeBorderWidth) (pWin, bw);
-    cs->ChangeBorderWidth = pScreen->ChangeBorderWidth;
-    pScreen->ChangeBorderWidth = compChangeBorderWidth;
-    if (pWin->redirectDraw != RedirectDrawNone)
-    {
-	CompWindowPtr	cw = GetCompWindow (pWin);
-	if (cw->pOldPixmap)
-	{
-	    (*pScreen->DestroyPixmap) (cw->pOldPixmap);
-	    cw->pOldPixmap = NullPixmap;
-	}
-    }
-    compCheckTree (pWin->drawable.pScreen);
-}
-
-void
 compReparentWindow (WindowPtr pWin, WindowPtr pPriorParent)
 {
     ScreenPtr		pScreen = pWin->drawable.pScreen;
@@ -822,3 +696,48 @@ CompositeRealChildHead (WindowPtr pWin)
 	return pChildBefore;
     }
 }
+
+int
+compConfigNotify(WindowPtr pWin, int x, int y, int w, int h,
+		 int bw, WindowPtr pSib)
+{
+    ScreenPtr		pScreen = pWin->drawable.pScreen;
+    CompScreenPtr	cs = GetCompScreen (pScreen);
+    Bool                ret = 0;
+    WindowPtr		pParent = pWin->parent;
+    CompWindowPtr       cw;
+    int			draw_x, draw_y;
+    Bool alloc_ret;
+
+    if (cs->ConfigNotify)
+    {
+	pScreen->ConfigNotify = cs->ConfigNotify;
+	ret = (*pScreen->ConfigNotify)(pWin, x, y, w, h, bw, pSib);
+	cs->ConfigNotify = pScreen->ConfigNotify;
+	pScreen->ConfigNotify = compConfigNotify;
+
+	if (ret)
+	    return ret;
+    }
+
+    if (pWin->redirectDraw == RedirectDrawNone)
+	return Success;
+
+    compCheckTree (pScreen);
+
+    draw_x = pParent->drawable.x + x + bw;
+    draw_y = pParent->drawable.y + y + bw;
+    alloc_ret = compReallocPixmap (pWin, draw_x, draw_y, w, h, bw);
+    
+    cw = GetCompWindow (pWin);
+    if (cw->pOldPixmap)
+    {
+	(*pScreen->DestroyPixmap) (cw->pOldPixmap);
+	cw->pOldPixmap = NullPixmap;
+    }
+    compCheckTree (pScreen);
+
+    if (alloc_ret == FALSE)
+	return BadAlloc;
+    return Success;
+}