Wes xx mediapipe integration

Packages/com.github.homuler.mediapipe/Runtime/Scripts/Unity/Annotation/MaskAnnotationController.cs

@@ -0,0 +1,53 @@
+// Copyright (c) 2021 homuler
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+namespace Mediapipe.Unity
+{
+  public class MaskAnnotationController : AnnotationController<MaskAnnotation>
+  {
+    private int _maskWidth;
+    private int _maskHeight;
+
+    private ImageFrame _currentTarget;
+    private float[] _maskArray;
+
+    public void InitScreen(int maskWidth, int maskHeight)
+    {
+      _maskWidth = maskWidth;
+      _maskHeight = maskHeight;
+      _maskArray = new float[_maskWidth * _maskHeight];
+      annotation.Init(_maskWidth, _maskHeight);
+    }
+
+    public void DrawNow(ImageFrame target)
+    {
+      _currentTarget = target;
+      UpdateMaskArray(_currentTarget);
+      SyncNow();
+    }
+
+    public void DrawLater(ImageFrame target)
+    {
+      UpdateCurrentTarget(target, ref _currentTarget);
+      UpdateMaskArray(_currentTarget);
+    }
+
+    private void UpdateMaskArray(ImageFrame imageFrame)
+    {
+      if (imageFrame != null)
+      {
+        // NOTE: assume that the image is transformed properly by calculators.
+        var _ = imageFrame.TryReadChannelNormalized(0, _maskArray);
+      }
+    }
+
+    protected override void SyncNow()
+    {
+      isStale = false;
+      annotation.Draw(_currentTarget == null ? null : _maskArray, _maskWidth, _maskHeight);
+    }
+  }
+}