add helper functions

src/Avalonia.Native.OSX/common.h

@@ -10,4 +10,8 @@
 extern IAvnPlatformThreadingInterface* CreatePlatformThreading();
 extern IAvnWindow* CreateAvnWindow(IAvnWindowEvents*events);
 extern IAvnPopup* CreateAvnPopup(IAvnWindowEvents*events);
+
+extern NSPoint ToNSPoint (AvnPoint p);
+extern AvnPoint ToAvnPoint (NSPoint p);
+extern AvnPoint ConvertPointY (AvnPoint p);
 #endif

src/Avalonia.Native.OSX/main.mm

@@ -100,3 +100,33 @@ extern "C" IAvaloniaNativeFactory* CreateAvaloniaNative()
 {
     return new AvaloniaNative();
 };
+
+
+NSPoint ToNSPoint (AvnPoint p)
+{
+    NSPoint result;
+    result.x = p.X;
+    result.y = p.Y;
+    
+    return result;
+}
+
+AvnPoint ToAvnPoint (NSPoint p)
+{
+    AvnPoint result;
+    result.X = p.x;
+    result.Y = p.y;
+    
+    return result;
+}
+
+
+AvnPoint ConvertPointY (AvnPoint p)
+{
+    auto sw = [NSScreen.screens objectAtIndex:0].frame;
+    
+    auto t = MAX(sw.origin.y, sw.origin.y + sw.size.height);
+    p.Y = t - p.Y;
+    
+    return p;
+}