perf(WindowManager): Add RawPixelsToBase64EncodeImage binding

src/Uno.UI/UI/Xaml/Media/Imaging/WriteableBitmap.wasm.cs

@@ -4,6 +4,7 @@ using System.Runtime.InteropServices;
 using Windows.Foundation;
 using Windows.Storage.Streams;
 using Uno.Foundation;
+using Uno.UI.Xaml;
 using Uno.UI.Xaml.Media;
 
 namespace Windows.UI.Xaml.Media.Imaging
@@ -17,7 +18,7 @@ namespace Windows.UI.Xaml.Media.Imaging
 
 			try
 			{
-				var value = WebAssemblyRuntime.InvokeJS("Uno.UI.WindowManager.current.rawPixelsToBase64EncodeImage(" + pinnedData + ", " + PixelWidth + ", " + PixelHeight + ");");
+				var value = WindowManagerInterop.RawPixelsToBase64EncodeImage(pinnedData, PixelWidth, PixelHeight);
 
 				image = ImageData.FromDataUri(value);
 

src/Uno.UI/UI/Xaml/WindowManagerInterop.wasm.cs

@@ -1180,6 +1180,14 @@ namespace Uno.UI.Xaml
 		}
 		#endregion
 
+		internal static string RawPixelsToBase64EncodeImage(IntPtr data, int width, int height)
+			=>
+#if NET7_0_OR_GREATER
+				NativeMethods.RawPixelsToBase64EncodeImage(data, width, height);
+#else
+				WebAssemblyRuntime.InvokeJS("Uno.UI.WindowManager.current.rawPixelsToBase64EncodeImage(" + data + ", " + width + ", " + height + ");");
+#endif
+
 		internal static void SetRootElement(IntPtr htmlId)
 		{
 #if NET7_0_OR_GREATER
@@ -1259,6 +1267,9 @@ namespace Uno.UI.Xaml
 			[JSImport("globalThis.Uno.UI.WindowManager.current.measureViewNativeFast")]
 			internal static partial void MeasureView(IntPtr htmlId, double availableWidth, double availableHeight, bool measureContent, IntPtr pReturn);
 
+			[JSImport("globalThis.Uno.UI.WindowManager.current.rawPixelsToBase64EncodeImage")]
+			internal static partial string RawPixelsToBase64EncodeImage(IntPtr data, int width, int height);
+
 			[JSImport("globalThis.Uno.UI.WindowManager.current.releasePointerCapture")]
 			internal static partial void ReleasePointerCapture(IntPtr htmlId, double pointerId);