Revert "mi: Remove unused overlay support"

This reverts commit 9120e58556014e514eef9dfe43cdea4b74dc66ae.

 Whoops, please revert this patch -- overlay is in use in nvidia drivers,
 and it's too late in release cycle to remove it.

 I feel really sorry that I kept this patch in my tree. I will submit
another one, removing only XAA overlay hooks which are not used at all.

1 files changed, 32 insertions, 0 deletions

diff --git a/mi/mioverlay.h b/mi/mioverlay.h
new file mode 100644
index 000000000..dca65ad37
--- /dev/null
+++ b/mi/mioverlay.h
@@ -0,0 +1,32 @@
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#ifndef __MIOVERLAY_H
+#define __MIOVERLAY_H
+
+typedef void (*miOverlayTransFunc)(ScreenPtr, int, BoxPtr);
+typedef Bool (*miOverlayInOverlayFunc)(WindowPtr);
+
+extern _X_EXPORT Bool
+miInitOverlay(
+   ScreenPtr pScreen, 
+   miOverlayInOverlayFunc inOverlay,
+   miOverlayTransFunc trans
+);
+
+extern _X_EXPORT Bool
+miOverlayGetPrivateClips(
+    WindowPtr pWin,
+    RegionPtr *borderClip,
+    RegionPtr *clipList
+);
+
+extern _X_EXPORT Bool miOverlayCollectUnderlayRegions(WindowPtr, RegionPtr*);
+extern _X_EXPORT void miOverlayComputeCompositeClip(GCPtr, WindowPtr);
+extern _X_EXPORT Bool miOverlayCopyUnderlay(ScreenPtr);
+extern _X_EXPORT void miOverlaySetTransFunction(ScreenPtr, miOverlayTransFunc);
+extern _X_EXPORT void miOverlaySetRootClip(ScreenPtr, Bool);
+
+#endif /* __MIOVERLAY_H */