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PointOfSale/Utilities/ESCPOS_NET/Extensions/ImageSharpExtensions.cs

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+using SixLabors.ImageSharp.PixelFormats;
+using SixLabors.ImageSharp.Processing;
+
+namespace SixLabors.ImageSharp
+{
+    public static class ImageSharpExtensions
+    {
+        public static byte[] ToSingleBitPixelByteArray(this Image<Rgba32> image, bool rasterFormat = true, int? maxWidth = null, int? maxHeight = null, float threshold = 0.5F)
+        {
+            image.Mutate(img =>
+            {
+                if (maxWidth.HasValue || maxHeight.HasValue)
+                {
+                    img.Resize(new ResizeOptions
+                    {
+                        Mode = ResizeMode.Max,
+                        Size = new Size(maxWidth ?? int.MaxValue, maxHeight ?? int.MaxValue),
+                    });
+                }
+
+                img.BackgroundColor(Color.White);
+                img.Grayscale().BinaryDither(KnownDitherings.Stucki);
+
+                if (!rasterFormat)
+                {
+                    img.Rotate(RotateMode.Rotate90);
+                    img.Flip(FlipMode.Horizontal);
+                }
+            });
+
+            var result = image.ToSingleBitPixelByteArray();
+            return result;
+        }
+
+        private static byte[] ToSingleBitPixelByteArray(this Image<Rgba32> image)
+        {
+            var bytesPerRow = (image.Width + 7 & -8) / 8;
+
+            var result = new byte[bytesPerRow * image.Height];
+            for (int y = 0; y < image.Height; y++)
+            {
+                var row = image.GetPixelRowSpan(y);
+                var rowStartPosition = y * bytesPerRow;
+
+                for (int x = 0; x < row.Length; x++)
+                {
+                    if (!row[x].IsBlack())
+                    {
+                        continue;
+                    }
+
+                    result[rowStartPosition + (x / 8)] |= (byte)(0x01 << (7 - (x % 8)));
+                }
+            }
+
+            return result;
+        }
+
+        private static bool IsBlack(this Rgba32 rgba)
+        {
+            return rgba.R == 0 && rgba.G == 0 && rgba.B == 0;
+        }
+    }
+}

PointOfSale/Utilities/ESCPOS_NET/Extensions/TaskExtensions.cs

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+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ESCPOS_NET.Extensions
+{
+    public static class TaskExtensions
+    {
+        public static void LogExceptions(this Task task)
+        {
+            task.ContinueWith(t =>
+            {
+                var aggException = t.Exception.Flatten();
+                foreach (var exception in aggException.InnerExceptions)
+                {
+                    Logging.Logger?.LogError(exception, "Uncaught Thread Exception.");
+                }
+            },
+            TaskContinuationOptions.OnlyOnFaulted);
+        }
+    }
+}

PointOfSale/Utilities/ESCPOS_NET/Extensions/Util.cs

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+using System.Collections.Generic;
+
+namespace ESCPOS_NET.Extensions
+{
+    public static class Util
+    {
+        /// <summary>
+        /// Adds to the list of T items and/or enumerables of T. All other types will be ignored and not added to the list.
+        /// </summary>
+        /// <typeparam name="T">List's items type.</typeparam>
+        /// <param name="list">List to be added the items.</param>
+        /// <param name="items">Items to be added.</param>
+        /// <returns>True if no item was ignored, otherwise False.</returns>
+        public static bool AddRange<T>(this List<T> list, params object[] items)
+        {
+            bool ignoredItems = false;
+            foreach (var item in items)
+            {
+                if (item is T itemT)
+                {
+                    list.Add(itemT);
+                }
+                else if (item is IEnumerable<T> arrayT)
+                {
+                    list.AddRange(arrayT);
+                }
+                else
+                {
+                    ignoredItems = true;
+                }
+            }
+
+            return !ignoredItems;
+        }
+    }
+}