Add implementation of window overlays

1 files changed, 7 insertions, 0 deletions

diff --git a/window.h b/window.h
index cd6def7..7fa684f 100644
--- a/window.h
+++ b/window.h
@@ -23,6 +23,7 @@
 
 struct Window;
 struct Frame;
+struct Overlay;
 
 struct WindowEventHandlers {
   void (*OnClose)(void* user);
@@ -42,4 +43,10 @@ bool WindowAssignFrames(struct Window* window, size_t nframes,
 bool WindowShowFrame(struct Window* window, size_t index);
 void WindowDestroy(struct Window* window);
 
+struct Overlay* OverlayCreate(const struct Window* window, int x, int y,
+                              int width, int height);
+void* OverlayLock(struct Overlay* overlay);
+void OverlayUnlock(struct Overlay* overlay);
+void OverlayDestroy(struct Overlay* overlay);
+
 #endif  // RECEIVER_WINDOW_H_