Sprite-based click detection.

Content.Tests/Client/ClickMapTest.cs

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+using Content.Client;
+using NUnit.Framework;
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+
+namespace Content.Tests.Client
+{
+    [TestFixture]
+    public class ClickMapTest
+    {
+        [Test]
+        public void TestBasic()
+        {
+            var img = new Image<Rgba32>(2, 2)
+            {
+                [0, 0] = new Rgba32(0, 0, 0, 0f),
+                [1, 0] = new Rgba32(0, 0, 0, 1f),
+                [0, 1] = new Rgba32(0, 0, 0, 1f),
+                [1, 1] = new Rgba32(0, 0, 0, 0f)
+            };
+
+            var clickMap = ClickMapManager.ClickMap.FromImage(img, 0.5f);
+
+            Assert.That(clickMap.IsOccluded(0, 0), Is.False);
+            Assert.That(clickMap.IsOccluded(1, 0), Is.True);
+            Assert.That(clickMap.IsOccluded(0, 1), Is.True);
+            Assert.That(clickMap.IsOccluded(1, 1), Is.False);
+        }
+
+        [Test]
+        public void TestThreshold()
+        {
+            var img = new Image<Rgba32>(2, 2)
+            {
+                [0, 0] = new Rgba32(0, 0, 0, 0f),
+                [1, 0] = new Rgba32(0, 0, 0, 0.25f),
+                [0, 1] = new Rgba32(0, 0, 0, 0.75f),
+                [1, 1] = new Rgba32(0, 0, 0, 1f)
+            };
+
+            var clickMap = ClickMapManager.ClickMap.FromImage(img, 0.5f);
+
+            Assert.That(clickMap.IsOccluded(0, 0), Is.False);
+            Assert.That(clickMap.IsOccluded(1, 0), Is.False);
+            Assert.That(clickMap.IsOccluded(0, 1), Is.True);
+            Assert.That(clickMap.IsOccluded(1, 1), Is.True);
+        }
+    }
+}