[unity] Repacking now caches texture clones. This improves multiple subsequent repacking performance, but requires calling SpriteAtlasRegionExtensions.ClearCache to clean up.

spine-unity/Assets/spine-unity/Modules/AttachmentTools/AttachmentTools.cs

@@ -469,9 +469,9 @@ namespace Spine.Unity.Modules.AttachmentTools {
 				a.SetRegion(repackedRegions[regionIndexes[i]]);
 			}
 
-			// Clean up
-			foreach (var ttp in texturesToPack)
-				UnityEngine.Object.Destroy(ttp);
+//			// Clean up
+//			foreach (var ttp in texturesToPack)
+//				UnityEngine.Object.Destroy(ttp);
 
 			t = newTexture;
 			m = newMaterial;
@@ -482,20 +482,38 @@ namespace Spine.Unity.Modules.AttachmentTools {
 			return Sprite.Create(ar.GetMainTexture(), ar.GetUnityRect(), new Vector2(0.5f, 0.5f), pixelsPerUnit);
 		}
 
+		static Dictionary<AtlasRegion, Texture2D> CachedRegionTextures = new Dictionary<AtlasRegion, Texture2D>();
+		static List<Texture2D> CachedRegionTexturesList = new List<Texture2D>();
+
+		public static void ClearCache () {
+			foreach (var t in CachedRegionTexturesList) {
+				UnityEngine.Object.Destroy(t);
+			}
+			CachedRegionTextures.Clear();
+			CachedRegionTexturesList.Clear();
+		}
+
 		/// <summary>Creates a new Texture2D object based on an AtlasRegion.
 		/// If applyImmediately is true, Texture2D.Apply is called immediately after the Texture2D is filled with data.</summary>
 		public static Texture2D ToTexture (this AtlasRegion ar, bool applyImmediately = true, TextureFormat textureFormat = SpineTextureFormat, bool mipmaps = UseMipMaps) {
-			Texture2D sourceTexture = ar.GetMainTexture();
-			Rect r = ar.GetUnityRect(sourceTexture.height);
-			int width = (int)r.width;
-			int height = (int)r.height;
-			Texture2D output = new Texture2D(width, height, textureFormat, mipmaps);
-			output.name = ar.name;
-			Color[] pixelBuffer = sourceTexture.GetPixels((int)r.x, (int)r.y, width, height);
-			output.SetPixels(pixelBuffer);
-
-			if (applyImmediately)
-				output.Apply();
+			Texture2D output;
+
+			CachedRegionTextures.TryGetValue(ar, out output);
+			if (output == null) {
+				Texture2D sourceTexture = ar.GetMainTexture();
+				Rect r = ar.GetUnityRect(sourceTexture.height);
+				int width = (int)r.width;
+				int height = (int)r.height;
+				output = new Texture2D(width, height, textureFormat, mipmaps);
+				output.name = ar.name;
+				Color[] pixelBuffer = sourceTexture.GetPixels((int)r.x, (int)r.y, width, height);
+				output.SetPixels(pixelBuffer);
+				CachedRegionTextures.Add(ar, output);
+				CachedRegionTexturesList.Add(output);
+
+				if (applyImmediately)
+					output.Apply();
+			}
 
 			return output;
 		}