diff --git a/mi/meson.build b/mi/meson.build
index 74595494e..cccdb06eb 100644
--- a/mi/meson.build
+++ b/mi/meson.build
@@ -9,6 +9,7 @@ srcs_mi = [
     'mifillarc.c',
     'migc.c',
     'miglblt.c',
+    'mioverlay.c',
     'mipointer.c',
     'mipoly.c',
     'mipolypnt.c',
diff --git a/mi/mioverlay.c b/mi/mioverlay.c
new file mode 100644
index 000000000..23cc2b366
--- /dev/null
+++ b/mi/mioverlay.c
@@ -0,0 +1,56 @@
+
+#include <dix-config.h>
+
+#include <X11/X.h>
+
+#include "dix/cursor_priv.h"
+#include "mi/mi_priv.h"
+
+#include "scrnintstr.h"
+#include <X11/extensions/shapeproto.h>
+#include "validate.h"
+#include "windowstr.h"
+#include "gcstruct.h"
+#include "regionstr.h"
+#include "privates.h"
+#include "mivalidate.h"
+#include "mioverlay.h"
+#include "migc.h"
+
+#include "globals.h"
+
+typedef struct {
+    RegionRec exposed;
+    RegionRec borderExposed;
+    RegionPtr borderVisible;
+    DDXPointRec oldAbsCorner;
+} miOverlayValDataRec, *miOverlayValDataPtr;
+
+typedef struct _TreeRec {
+    WindowPtr pWin;
+    struct _TreeRec *parent;
+    struct _TreeRec *firstChild;
+    struct _TreeRec *lastChild;
+    struct _TreeRec *prevSib;
+    struct _TreeRec *nextSib;
+    RegionRec borderClip;
+    RegionRec clipList;
+    unsigned visibility;
+    miOverlayValDataPtr valdata;
+} miOverlayTreeRec, *miOverlayTreePtr;
+
+typedef struct {
+    miOverlayTreePtr tree;
+} miOverlayWindowRec, *miOverlayWindowPtr;
+
+typedef struct {
+    CloseScreenProcPtr CloseScreen;
+    CreateWindowProcPtr CreateWindow;
+    DestroyWindowProcPtr DestroyWindow;
+    UnrealizeWindowProcPtr UnrealizeWindow;
+    RealizeWindowProcPtr RealizeWindow;
+    miOverlayTransFunc MakeTransparent;
+    miOverlayInOverlayFunc InOverlay;
+    Bool underlayMarked;
+    Bool copyUnderlay;
+} miOverlayScreenRec, *miOverlayScreenPtr;