PixelBufferBase implements IDisposable

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroGraphics/Driver/Buffers/PixelBufferBase.cs

@@ -6,7 +6,7 @@ namespace Meadow.Foundation.Graphics.Buffers
     /// <summary>
     /// Represents a pixel buffer
     /// </summary>
-    public abstract class PixelBufferBase : IPixelBuffer
+    public abstract class PixelBufferBase : IPixelBuffer, IDisposable
     {
         /// <summary>
         /// Width of buffer in pixels
@@ -61,6 +61,12 @@ public int BitDepth
         /// </summary>
         public byte[] Buffer { get; protected set; }
 
+        /// <summary>
+        /// Did we create the buffer (true) or was it passed in (false)
+        /// </summary>
+        readonly bool createdBuffer = true;
+
+        bool isDisposed = false;
 
         /// <summary>
         /// Create a new PixelBufferBase object
@@ -94,6 +100,8 @@ public PixelBufferBase(int width, int height, byte[] buffer)
                 throw new ArgumentException($"Provided buffer length ({buffer.Length}) does not match this buffer's ByteCount ({ByteCount}).");
             }
             Buffer = buffer;
+
+            createdBuffer = false;
         }
 
         /// <summary>
@@ -331,5 +339,33 @@ public double GetColorDistance(Color color1, Color color2)
 
             return Math.Sqrt(rDeltaSquared + gDeltaSquared + bDeltaSquared);
         }
+
+        /// <summary>
+        /// Disposes the instances resources
+        /// </summary>
+        /// <param name="disposing"></param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if(!isDisposed)
+            {
+                if (createdBuffer)
+                {
+                    if (disposing)
+                    {
+                        Buffer = null;
+                    }
+                }
+            }
+            isDisposed = true;
+        }
+
+        /// <summary>
+        /// Disposes the instances resources
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
     }
-}
+}