Initial Commit

Assets/Scripts/UI/SpriteImage.cs

@@ -0,0 +1,144 @@
+using Trive.Assets.Scripts.Utils.Extensions;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Assets.Scripts.UI
+{
+	public class SpriteImage : MaskableGraphic
+	{
+		protected static Material s_ETC1DefaultUI;
+
+		[SerializeField] private Sprite m_Sprite;
+
+		public static Material defaultETC1GraphicMaterial
+		{
+			get
+			{
+				if (s_ETC1DefaultUI == null)
+				{
+					s_ETC1DefaultUI = Canvas.GetETC1SupportedCanvasMaterial();
+				}
+				return s_ETC1DefaultUI;
+			}
+		}
+
+		public Sprite sprite
+		{
+			get => m_Sprite;
+			set
+			{
+				if (m_Sprite != value)
+				{
+					m_Sprite = value;
+					SetAllDirty();
+				}
+			}
+		}
+
+		public float pixelsPerUnit
+		{
+			get
+			{
+				float spritePixelsPerUnit = 100;
+				if (sprite)
+				{
+					spritePixelsPerUnit = sprite.pixelsPerUnit;
+				}
+
+				float referencePixelsPerUnit = 100;
+				if (canvas)
+				{
+					referencePixelsPerUnit = canvas.referencePixelsPerUnit;
+				}
+
+				return spritePixelsPerUnit / referencePixelsPerUnit;
+			}
+		}
+
+		public override Texture mainTexture
+		{
+			get
+			{
+				if (sprite == null)
+				{
+					if (material != null && material.mainTexture != null)
+					{
+						return material.mainTexture;
+					}
+					return s_WhiteTexture;
+				}
+
+				return sprite.texture;
+			}
+		}
+
+		public override Material material
+		{
+			get
+			{
+				if (m_Material != null)
+				{
+					return m_Material;
+				}
+#if UNITY_EDITOR
+				if (Application.isPlaying && sprite && sprite.associatedAlphaSplitTexture != null)
+				{
+					return defaultETC1GraphicMaterial;
+				}
+#else
+				if (sprite && sprite.associatedAlphaSplitTexture != null)
+					return defaultETC1GraphicMaterial;
+#endif
+
+				return defaultMaterial;
+			}
+
+			set { base.material = value; }
+		}
+
+		protected override void OnPopulateMesh(VertexHelper toFill)
+		{
+			if (sprite == null)
+			{
+				base.OnPopulateMesh(toFill);
+				return;
+			}
+
+			toFill.Clear();
+			var rect = GetPixelAdjustedRect();
+			var vertecies = sprite.vertices;
+
+			if (vertecies.Length <= 0)
+			{
+				base.OnPopulateMesh(toFill);
+				return;
+			}
+
+			var bounds = new Rect(vertecies[0], Vector2.zero);
+			for (var i = 1; i < vertecies.Length; i++)
+			{
+				bounds = bounds.Encapculate(vertecies[i]);
+			}
+
+			var maxDist = Mathf.Max(bounds.width, bounds.height) * 0.5f;
+			var triangles = sprite.triangles;
+			var uv = sprite.uv;
+
+			for (var i = 0; i < vertecies.Length; i++)
+			{
+				toFill.AddVert(
+					new UIVertex
+					{
+						position = (vertecies[i] - bounds.center) / maxDist * Mathf.Min(rect.width, rect.height) * 0.5f,
+						color = color,
+						uv0 = uv[i]
+					});
+			}
+
+			for (var i = 0; i < triangles.Length; i += 3)
+			{
+				toFill.AddTriangle(triangles[i], triangles[i + 1], triangles[i + 2]);
+			}
+		}
+	}
+}