Parallax refactors (#7654)

Content.Client/Parallax/Data/IParallaxTextureSource.cs

@@ -0,0 +1,19 @@
+using System.Threading;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Client.Graphics;
+
+namespace Content.Client.Parallax.Data
+{
+    [ImplicitDataDefinitionForInheritors]
+    public interface IParallaxTextureSource
+    {
+        /// <summary>
+        /// Generates or loads the texture.
+        /// Note that this should be cached, but not necessarily *here*.
+        /// </summary>
+        Task<Texture> GenerateTexture(CancellationToken cancel = default);
+    }
+}
+