Add love.window.getSafeArea (resolves issue #1437). Returns a rectangle (x, y, w, h) inside the window which is known to be unobstructed by a system title bar, the iPhone X notch, etc. Useful for making sure UI elements can be seen by the user.

Currently it only has a proper implementation on iOS and will return the window's full size otherwise.

src/common/ios.h

@@ -25,8 +25,12 @@
 
 #ifdef LOVE_IOS
 
+#include "common/math.h"
+
 #include <string>
 
+struct SDL_Window;
+
 namespace love
 {
 namespace ios
@@ -74,6 +78,12 @@ void setAudioMixWithOthers(bool mixEnabled);
  **/
 bool hasBackgroundMusic();
 
+/**
+ * Gets the area in the window that is safe for UI to render to (not covered by
+ * the status bar, notch, etc.)
+ **/
+Rect getSafeArea(SDL_Window *window);
+
 } // ios
 } // love