Adds a working but slightly buggy pipeline implementation.

1 files changed, 47 insertions, 0 deletions

diff --git a/Models/AvalarPipeline.cs b/Models/AvalarPipeline.cs
new file mode 100644
index 0000000..14e32d0
--- /dev/null
+++ b/Models/AvalarPipeline.cs
@@ -0,0 +1,47 @@
+using Avalonia.Media.Imaging;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Avalar.Models
+{
+    public class AvalarPipeline
+    {
+        private readonly IEnumerable<IPipelineStep> m_steps;
+
+        public AvalarPipeline(IEnumerable<IPipelineStep> steps)
+        {
+            m_steps = steps ?? throw new ArgumentNullException(nameof(steps));
+            foreach (var step in m_steps)
+            {
+                step.PropertyChanged += OnPipelineComponentChanged;
+            }
+        }
+
+        private void OnPipelineComponentChanged(object sender, PropertyChangedEventArgs e)
+        {
+            foreach (var step in m_steps.SkipWhile(step => step != sender))
+            {
+                step.InvalidateResult();
+            }
+
+            PipelineChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        public event EventHandler PipelineChanged;
+
+        public async Task<IBitmap> Run(IBitmap bitmap, CancellationToken token)
+        {
+            var input = bitmap;
+            foreach(var step in m_steps)
+            {
+                token.ThrowIfCancellationRequested();
+                input = await step.Run(input, token).ConfigureAwait(false);
+            }
+            return input;
+        }
+    }
+}