Created unity project

3D FPS/Library/PackageCache/com.unity.collab-proxy@2.6.0/Editor/UI/Avatar/ApplyCircleMask.cs

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+using UnityEngine;
+
+namespace Unity.PlasticSCM.Editor.UI.Avatar
+{
+    internal static class ApplyCircleMask
+    {
+        internal static Texture2D For(Texture2D sourceImage)
+        {
+            int centerx = sourceImage.width / 2;
+            int centery = sourceImage.height / 2;
+
+            int radius = sourceImage.width / 2;
+
+            Texture2D result = Images.GetNewTextureFromTexture(sourceImage);
+
+            for (int i = (centerx - radius); i < centerx + radius; i++)
+            {
+                for (int j = (centery - radius); j < centery + radius; j++)
+                {
+                    float dx = i - centerx;
+                    float dy = j - centery;
+
+                    float d = Mathf.Sqrt(dx * dx + dy * dy);
+
+                    float borderSize = 1f;
+
+                    if (d <= (radius - borderSize))
+                    {
+                        result.SetPixel(
+                            i - (centerx - radius),
+                            j - (centery - radius),
+                            sourceImage.GetPixel(i, j));
+                        continue;
+                    }
+
+                    Color color = sourceImage.GetPixel(i, j);
+
+                    result.SetPixel(
+                        i - (centerx - radius),
+                        j - (centery - radius),
+                        Color.Lerp(Color.clear, color,
+                            GetAntialiasAlpha(radius, d, borderSize)));
+                }
+            }
+
+            result.Apply();
+
+            return result;
+        }
+
+        static float GetAntialiasAlpha(float radius, float d, float borderSize)
+        {
+            if (d >= (radius + borderSize))
+                return 0f;
+
+            if (d - radius - borderSize == 0)
+                return 0;
+
+            float proportion =
+                Mathf.Abs(d - radius - borderSize) /
+                (radius + borderSize) - (radius - borderSize);
+
+            return Mathf.Max(0, 1.0f - proportion);
+        }
+    }
+}