Expose SKPath.ToWinding (#1326)

Fixes #840

binding/Binding/SKPath.cs

@@ -437,6 +437,25 @@ namespace SkiaSharp
 			}
 		}
 
+		public bool ToWinding (SKPath result)
+		{
+			if (result == null)
+				throw new ArgumentNullException (nameof (result));
+
+			return SkiaApi.sk_pathop_as_winding (Handle, result.Handle);
+		}
+
+		public SKPath ToWinding ()
+		{
+			var result = new SKPath ();
+			if (ToWinding (result)) {
+				return result;
+			} else {
+				result.Dispose ();
+				return null;
+			}
+		}
+
 		public string ToSvgPathData ()
 		{
 			using (var str = new SKString ()) {

binding/Binding/SkiaApi.generated.cs

@@ -2454,6 +2454,11 @@ namespace SkiaSharp
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
 		internal static extern void sk_pathmeasure_set_path (sk_pathmeasure_t pathMeasure, sk_path_t path, [MarshalAs (UnmanagedType.I1)] bool forceClosed);
 
+		// bool sk_pathop_as_winding(const sk_path_t* path, sk_path_t* result)
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		[return: MarshalAs (UnmanagedType.I1)]
+		internal static extern bool sk_pathop_as_winding (sk_path_t path, sk_path_t result);
+
 		// bool sk_pathop_op(const sk_path_t* one, const sk_path_t* two, sk_pathop_t op, sk_path_t* result)
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
 		[return: MarshalAs (UnmanagedType.I1)]

externals/skia

@@ -1 +1 @@
-Subproject commit 24831bf34359a90aa3fbf4392bda6aa056e97919
+Subproject commit 4ddbe5cb84252a2896d53b80fa06584b919eb8a6

tests/Tests/SKPathTest.cs

@@ -488,5 +488,24 @@ namespace SkiaSharp.Tests
 				Assert.Equal(SKColors.Black, bitmap.GetPixel(90, 50));
 			}
 		}
+
+		[SkippableFact]
+		public void ToWinding()
+		{
+			using var path = new SKPath();
+			path.AddRect(new SKRect(1, 2, 3, 4));
+
+			using var result = new SKPath();
+
+			path.FillType = SKPathFillType.Winding;
+			Assert.True(path.ToWinding(result));
+			Assert.NotEqual(path, result);
+			Assert.Equal(SKPathFillType.Winding, path.FillType);
+
+			path.FillType = SKPathFillType.EvenOdd;
+			Assert.True(path.ToWinding(result));
+			Assert.NotEqual(path, result);
+			Assert.Equal(SKPathFillType.Winding, result.FillType);
+		}
 	}
 }