Working on the core part.

Progrart.Core/RenderContext.cs

@@ -1,16 +1,43 @@
-using Microsoft.Maui.Graphics.Skia;
+using SkiaSharp;
 
 namespace Progrart.Core
 {
-    public class RenderContext
-    {
-		SkiaBitmapExportContext context;
+	public class RenderContext
+	{
+		public PrimitiveDrawingCore DrawingCore { get; }
 
-		public void Init()
+		public SKCanvas canvas { get => DrawingCore.canvas; }
+		public RenderContext(PrimitiveDrawingCore core)
 		{
+			this.DrawingCore = core;
+		}
 
+		public RenderContext(int W, int H)
+		{
+			DrawingCore = new PrimitiveDrawingCore(W, H);
 		}
 	}
+	public class PrimitiveDrawingCore : IDisposable
+	{
+		internal bool isDisposed = false;
+		SKSurface surface;
+		SKImageInfo info;
+		public SKCanvas canvas { get; }
+		public PrimitiveDrawingCore(int W, int H)
+		{
+			info = new SKImageInfo(W, H);
+			surface = SKSurface.Create(info);
+			canvas = surface.Canvas;
+		}
+		public void Dispose()
+		{
+			if (isDisposed) return;
+			//GC.SuppressFinalize(this);
+			isDisposed = true;
+			surface.Dispose();
+		}
+	}
+
 	[Serializable]
 	public class RenderConfig
 	{