[FRAMEBUF] Implement required DirectDraw functions

However, do not support any optional callback.

dxdiag now accepts to run DirectDraw tests.

win32ss/drivers/displays/framebuf/enable.c

@@ -31,10 +31,46 @@ static DRVFN DrvFunctionTable[] =
    {INDEX_DrvGetModes, (PFN)DrvGetModes},
    {INDEX_DrvSetPalette, (PFN)DrvSetPalette},
    {INDEX_DrvSetPointerShape, (PFN)DrvSetPointerShape},
-   {INDEX_DrvMovePointer, (PFN)DrvMovePointer}
+   {INDEX_DrvMovePointer, (PFN)DrvMovePointer},
+   {INDEX_DrvEnableDirectDraw, (PFN)DrvEnableDirectDraw},
+   {INDEX_DrvDisableDirectDraw, (PFN)DrvDisableDirectDraw},
 
 };
 
+/*
+ * DrvEnableDirectDraw
+ */
+
+BOOL APIENTRY
+DrvEnableDirectDraw(
+    DHPDEV dhpdev,
+    DD_CALLBACKS *pCallbacks,
+    DD_SURFACECALLBACKS *pSurfaceCallbacks,
+    DD_PALETTECALLBACKS *pPaletteCallbacks)
+{
+    RtlZeroMemory(pCallbacks, sizeof(*pCallbacks));
+    RtlZeroMemory(pSurfaceCallbacks, sizeof(*pSurfaceCallbacks));
+    RtlZeroMemory(pPaletteCallbacks, sizeof(*pPaletteCallbacks));
+
+    pCallbacks->dwSize = sizeof(*pCallbacks);
+    pSurfaceCallbacks->dwSize = sizeof(*pSurfaceCallbacks);
+    pPaletteCallbacks->dwSize = sizeof(*pPaletteCallbacks);
+
+    /* We don't support any optional callback */
+
+    return TRUE;
+}
+
+/*
+ * DrvDisableDirectDraw
+ */
+
+VOID APIENTRY
+DrvDisableDirectDraw(
+    DHPDEV dhpdev)
+{
+}
+
 /*
  * DrvEnableDriver
  *

win32ss/drivers/displays/framebuf/framebuf.h

@@ -71,6 +71,17 @@ typedef struct _PDEV
 #define ALLOC_TAG	'FUBF'
 
 
+BOOL APIENTRY
+DrvEnableDirectDraw(
+    DHPDEV dhpdev,
+    DD_CALLBACKS *pCallbacks,
+    DD_SURFACECALLBACKS *pSurfaceCallbacks,
+    DD_PALETTECALLBACKS *pPaletteCallbacks);
+
+VOID APIENTRY
+DrvDisableDirectDraw(
+    DHPDEV dhpdev);
+
 DHPDEV APIENTRY
 DrvEnablePDEV(
    IN DEVMODEW *pdm,