Add play gif example (C# + SixLabors.ImageSharp)

bindings/c#/Makefile

@@ -22,6 +22,7 @@ build: $(RGB_LIBRARY)
 	dotnet build examples/MinimalExample/MinimalExample.csproj -p:SkipNative=false
 	dotnet build examples/PulsingBrightness/PulsingBrightness.csproj -p:SkipNative=false
 	dotnet build examples/Rotating3DCube/Rotating3DCube.csproj -p:SkipNative=false
+	dotnet build examples/PlayGIF/PlayGIF.csproj -p:SkipNative=false
 
 $(RGB_LIBRARY):
 	$(MAKE) -C $(RGB_LIBDIR)

bindings/c#/examples/PlayGIF/PlayGIF.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+    <ItemGroup>
+        <ProjectReference Include="..\..\RPiRgbLEDMatrix.csproj" />
+        <PackageReference Include="SixLabors.ImageSharp" Version="3.0.1" />
+    </ItemGroup>
+</Project>

bindings/c#/examples/PlayGIF/Program.cs

@@ -0,0 +1,40 @@
+using RPiRgbLEDMatrix;
+using System.Runtime.InteropServices;
+using Color = RPiRgbLEDMatrix.Color;
+
+Console.Write("GIF path: ");
+var path = Console.ReadLine()!;
+
+using var matrix = new RGBLedMatrix(32, 2, 1);
+var canvas = matrix.CreateOffscreenCanvas();
+
+Configuration.Default.PreferContiguousImageBuffers = true;
+using var image = Image.Load<Rgb24>(path);
+image.Mutate(o => o.Resize(canvas.Width, canvas.Height));
+
+var running = true;
+Console.CancelKeyPress += (s, e) =>
+{
+    running = false;
+    e.Cancel = true; // don't terminate, we need to dispose
+};
+
+var frame = -1;
+// preprocess frames to get delays and pixel buffers
+var frames = image.Frames
+    .Select(f => (
+        Pixels: f.DangerousTryGetSinglePixelMemory(out var memory) ? memory : throw new("Could not get pixel buffer"),
+        Delay: f.Metadata.GetGifMetadata().FrameDelay * 10
+    )).ToArray();
+
+// run until user presses Ctrl+C
+while (running)
+{
+    frame = (frame + 1) % frames.Length;
+
+    var data = MemoryMarshal.Cast<Rgb24, Color>(frames[frame].Pixels.Span);
+    canvas.SetPixels(0, 0, canvas.Width, canvas.Height, data);
+
+    matrix.SwapOnVsync(canvas);
+    Thread.Sleep(frames[frame].Delay);
+}