xnest: wrap the xnest cursor sprite funcs around the mi funcs.

Modelled after the xfree86 code. Call miDCInitialize to init the SW rendering
engine, then take the pointers, store it in a xnest-local variable, and put
the xnest-specific sprite funcs in place. In the xnest sprite funcs, call
through to the mi sprite funcs after doing xnest-specific stuff.

hw/xnest/Cursor.c

@@ -25,6 +25,7 @@ is" without express or implied warranty.
 #include "cursorstr.h"
 #include "scrnintstr.h"
 #include "servermd.h"
+#include "mipointrst.h"
 
 #include "Xnest.h"
 
@@ -35,6 +36,8 @@ is" without express or implied warranty.
 #include "Keyboard.h"
 #include "Args.h"
 
+xnestCursorFuncRec xnestCursorFuncs = {NULL};
+
 Bool
 xnestRealizeCursor(DeviceIntPtr pDev, ScreenPtr pScreen, CursorPtr pCursor)
 {
@@ -155,3 +158,26 @@ void
 xnestMoveCursor (DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
 {
 }
+
+Bool
+xnestDeviceCursorInitialize(DeviceIntPtr pDev, ScreenPtr pScreen)
+{
+    xnestCursorFuncPtr pScreenPriv;
+
+    pScreenPriv = (xnestCursorFuncPtr)
+            dixLookupPrivate(&pScreen->devPrivates, xnestCursorScreenKey);
+
+    pScreenPriv->spriteFuncs->DeviceCursorInitialize(pDev, pScreen);
+    return TRUE;
+}
+
+void
+xnestDeviceCursorCleanup(DeviceIntPtr pDev, ScreenPtr pScreen)
+{
+    xnestCursorFuncPtr pScreenPriv;
+
+    pScreenPriv = (xnestCursorFuncPtr)
+            dixLookupPrivate(&pScreen->devPrivates, xnestCursorScreenKey);
+
+    pScreenPriv->spriteFuncs->DeviceCursorCleanup(pDev, pScreen);
+}

hw/xnest/Screen.c

@@ -41,9 +41,11 @@ is" without express or implied warranty.
 #include "Init.h"
 #include "mipointer.h"
 #include "Args.h"
+#include "mipointrst.h"
 
 Window xnestDefaultWindows[MAXSCREENS];
 Window xnestScreenSaverWindows[MAXSCREENS];
+DevPrivateKey xnestCursorScreenKey = &xnestCursorScreenKey;
 
 ScreenPtr
 xnestScreen(Window window)
@@ -124,8 +126,8 @@ static miPointerSpriteFuncRec xnestPointerSpriteFuncs =
     xnestUnrealizeCursor,
     xnestSetCursor,
     xnestMoveCursor,
-    NULL,
+    xnestDeviceCursorInitialize,
-    NULL
+    xnestDeviceCursorCleanup
 };
 
 Bool
@@ -141,6 +143,7 @@ xnestOpenScreen(int index, ScreenPtr pScreen, int argc, char *argv[])
   XSizeHints sizeHints;
   VisualID defaultVisual;
   int rootDepth;
+  miPointerScreenPtr PointPriv;
 
   if (!dixRequestPrivate(xnestWindowPrivateKey, sizeof(xnestPrivWin)))
       return False;
@@ -307,7 +310,11 @@ xnestOpenScreen(int index, ScreenPtr pScreen, int argc, char *argv[])
   pScreen->blockData = NULL;
   pScreen->wakeupData = NULL;
 
-  miDCInitialize (pScreen, &xnestPointerCursorFuncs);
+  miDCInitialize(pScreen, &xnestPointerCursorFuncs); /* init SW rendering */
+  PointPriv = dixLookupPrivate(&pScreen->devPrivates, miPointerScreenKey);
+  xnestCursorFuncs.spriteFuncs = PointPriv->spriteFuncs;
+  dixSetPrivate(&pScreen->devPrivates, xnestCursorScreenKey, &xnestCursorFuncs);
+  PointPriv->spriteFuncs = &xnestPointerSpriteFuncs;
 
   pScreen->mmWidth = xnestWidth * DisplayWidthMM(xnestDisplay, 
 		       DefaultScreen(xnestDisplay)) / 

hw/xnest/XNCursor.h

@@ -15,6 +15,15 @@ is" without express or implied warranty.
 #ifndef XNESTCURSOR_H
 #define XNESTCURSOR_H
 
+#include "mipointrst.h"
+
+typedef struct {
+    miPointerSpriteFuncPtr spriteFuncs;
+} xnestCursorFuncRec, *xnestCursorFuncPtr;
+
+extern DevPrivateKey xnestCursorScreenKey;
+extern xnestCursorFuncRec xnestCursorFuncs;
+
 typedef struct {
   Cursor cursor;
 } xnestPrivCursor;
@@ -44,5 +53,6 @@ void xnestSetCursor (DeviceIntPtr pDev,
 void xnestMoveCursor (DeviceIntPtr pDev,
                       ScreenPtr pScreen,
                       int x, int y);
-
+Bool xnestDeviceCursorInitialize(DeviceIntPtr pDev, ScreenPtr pScreen);
+void xnestDeviceCursorCleanup(DeviceIntPtr pDev, ScreenPtr pScreen);
 #endif /* XNESTCURSOR_H */