移除依赖库

SpineViewerCLI/CanvasAscii.cs

@@ -0,0 +1,188 @@
+using Spectre.Console;
+using Spectre.Console.Rendering;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewerCLI
+{
+    public class CanvasAscii : Renderable
+    {
+        private readonly Color?[,] _pixels;
+
+        /// <summary>
+        /// Gets the width of the canvas.
+        /// </summary>
+        public int Width { get; }
+
+        /// <summary>
+        /// Gets the height of the canvas.
+        /// </summary>
+        public int Height { get; }
+
+        /// <summary>
+        /// Gets or sets the render width of the canvas.
+        /// </summary>
+        public int? MaxWidth { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether or not
+        /// to scale the canvas when rendering.
+        /// </summary>
+        public bool Scale { get; set; } = true;
+
+        /// <summary>
+        /// Gets or sets the pixel width.
+        /// </summary>
+        public int PixelWidth { get; set; } = 2;
+
+        /// <summary>
+        /// Gets or sets the pixel lettters, ordered by transparency.
+        /// </summary>
+        public string PixelLetters { get; set; } = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/|()1{}[]?-_+~<>i!lI;:,^`'."; // ".:-=+*#%@" ... "@%#*+=-:."
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CanvasAscii"/> class.
+        /// </summary>
+        /// <param name="width">The canvas width.</param>
+        /// <param name="height">The canvas height.</param>
+        public CanvasAscii(int width, int height)
+        {
+            if (width < 1)
+            {
+                throw new ArgumentException("Must be > 1", nameof(width));
+            }
+
+            if (height < 1)
+            {
+                throw new ArgumentException("Must be > 1", nameof(height));
+            }
+
+            Width = width;
+            Height = height;
+
+            _pixels = new Color?[Width, Height];
+        }
+
+        /// <summary>
+        /// Sets a pixel with the specified color in the canvas at the specified location.
+        /// </summary>
+        /// <param name="x">The X coordinate for the pixel.</param>
+        /// <param name="y">The Y coordinate for the pixel.</param>
+        /// <param name="color">The pixel color.</param>
+        /// <returns>The same <see cref="CanvasAscii"/> instance so that multiple calls can be chained.</returns>
+        public CanvasAscii SetPixel(int x, int y, Color color)
+        {
+            _pixels[x, y] = color;
+            return this;
+        }
+
+        /// <inheritdoc/>
+        protected override Measurement Measure(RenderOptions options, int maxWidth)
+        {
+            if (PixelWidth < 0)
+            {
+                throw new InvalidOperationException("Pixel width must be greater than zero.");
+            }
+
+            var width = MaxWidth ?? Width;
+
+            if (maxWidth < width * PixelWidth)
+            {
+                return new Measurement(maxWidth, maxWidth);
+            }
+
+            return new Measurement(width * PixelWidth, width * PixelWidth);
+        }
+
+        /// <inheritdoc/>
+        protected override IEnumerable<Segment> Render(RenderOptions options, int maxWidth)
+        {
+            if (PixelWidth < 0)
+            {
+                throw new InvalidOperationException("Pixel width must be greater than zero.");
+            }
+
+            if (PixelLetters.Length <= 0)
+            {
+                throw new InvalidOperationException("Pixel letters can't be empty.");
+            }
+
+            var pixels = _pixels;
+            var emptyPixel = new string(' ', PixelWidth);
+            var width = Width;
+            var height = Height;
+
+            // Got a max width?
+            if (MaxWidth != null)
+            {
+                height = (int)(height * ((float)MaxWidth.Value) / Width);
+                width = MaxWidth.Value;
+            }
+
+            // Exceed the max width when we take pixel width into account?
+            if (width * PixelWidth > maxWidth)
+            {
+                height = (int)(height * (maxWidth / (float)(width * PixelWidth)));
+                width = maxWidth / PixelWidth;
+
+                // If it's not possible to scale the canvas sufficiently, it's too small to render.
+                if (height == 0)
+                {
+                    yield break;
+                }
+            }
+
+            // Need to rescale the pixel buffer?
+            if (Scale && (width != Width || height != Height))
+            {
+                pixels = ScaleDown(width, height);
+            }
+
+            for (var y = 0; y < height; y++)
+            {
+                for (var x = 0; x < width; x++)
+                {
+                    var color = pixels[x, y];
+                    if (color.HasValue)
+                    {
+                        yield return new Segment(emptyPixel, new Style(background: color));
+                    }
+                    else
+                    {
+                        yield return new Segment(emptyPixel);
+                    }
+                }
+
+                yield return Segment.LineBreak;
+            }
+        }
+
+        private Color?[,] ScaleDown(int newWidth, int newHeight)
+        {
+            var buffer = new Color?[newWidth, newHeight];
+            var xRatio = ((Width << 16) / newWidth) + 1;
+            var yRatio = ((Height << 16) / newHeight) + 1;
+
+            for (var i = 0; i < newHeight; i++)
+            {
+                for (var j = 0; j < newWidth; j++)
+                {
+                    buffer[j, i] = _pixels[(j * xRatio) >> 16, (i * yRatio) >> 16];
+                }
+            }
+
+            return buffer;
+        }
+
+        private static float GetBrightness(Color c) => (0.299f * c.R + 0.587f * c.G + 0.114f * c.B) / 255f;
+
+        private string GetPixelLetter(Color c)
+        {
+            var index = Math.Min((int)(GetBrightness(c) * PixelLetters.Length), PixelLetters.Length - 1);
+            return new(PixelLetters[index], PixelWidth);
+        }
+    }
+}

SpineViewerCLI/CanvasImageAscii.cs

@@ -0,0 +1,151 @@
+using SkiaSharp;
+using Spectre.Console;
+using Spectre.Console.Rendering;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpineViewerCLI
+{
+    internal class CanvasImageAscii : Renderable
+    {
+        private static readonly SKSamplingOptions _defaultSamplingOptions = new(new SKCubicResampler());
+
+        /// <summary>
+        /// Gets the image width.
+        /// </summary>
+        public int Width => Image.Width;
+
+        /// <summary>
+        /// Gets the image height.
+        /// </summary>
+        public int Height => Image.Height;
+
+        /// <summary>
+        /// Gets or sets the render width of the canvas.
+        /// </summary>
+        public int? MaxWidth { get; set; }
+
+        /// <summary>
+        /// Gets or sets the render width of the canvas.
+        /// </summary>
+        public int PixelWidth { get; set; } = 2;
+
+        /// <summary>
+        /// Gets or sets the <see cref="SKSamplingOptions"/> that should
+        /// be used when scaling the image. Defaults to bicubic sampling.
+        /// </summary>
+        public SKSamplingOptions? SamplingOptions { get; set; }
+
+        internal SKBitmap Image { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CanvasImageAscii"/> class.
+        /// </summary>
+        /// <param name="filename">The image filename.</param>
+        public CanvasImageAscii(string filename)
+        {
+            Image = SKBitmap.Decode(filename);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CanvasImageAscii"/> class.
+        /// </summary>
+        /// <param name="data">Buffer containing an image.</param>
+        public CanvasImageAscii(ReadOnlySpan<byte> data)
+        {
+            Image = SKBitmap.Decode(data);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CanvasImageAscii"/> class.
+        /// </summary>
+        /// <param name="data">Stream containing an image.</param>
+        public CanvasImageAscii(Stream data)
+        {
+            Image = SKBitmap.Decode(data);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CanvasImageAscii"/> class.
+        /// </summary>
+        /// <param name="image">The <see cref="SKImage"/> object.</param>
+        public CanvasImageAscii(SKImage image)
+        {
+            Image = SKBitmap.FromImage(image);
+        }
+
+        /// <inheritdoc/>
+        protected override Measurement Measure(RenderOptions options, int maxWidth)
+        {
+            if (PixelWidth < 0)
+            {
+                throw new InvalidOperationException("Pixel width must be greater than zero.");
+            }
+
+            var width = MaxWidth ?? Width;
+            if (maxWidth < width * PixelWidth)
+            {
+                return new Measurement(maxWidth, maxWidth);
+            }
+
+            return new Measurement(width * PixelWidth, width * PixelWidth);
+        }
+
+        /// <inheritdoc/>
+        protected override IEnumerable<Segment> Render(RenderOptions options, int maxWidth)
+        {
+            var image = Image;
+
+            var width = Width;
+            var height = Height;
+
+            // Got a max width?
+            if (MaxWidth != null)
+            {
+                height = (int)(height * ((float)MaxWidth.Value) / Width);
+                width = MaxWidth.Value;
+            }
+
+            // Exceed the max width when we take pixel width into account?
+            if (width * PixelWidth > maxWidth)
+            {
+                height = (int)(height * (maxWidth / (float)(width * PixelWidth)));
+                width = maxWidth / PixelWidth;
+            }
+
+            // Need to rescale the pixel buffer?
+            if (width != Width || height != Height)
+            {
+                var samplingOptions = SamplingOptions ?? _defaultSamplingOptions;
+                image = image.Resize(new SKSizeI(width, height), samplingOptions);
+            }
+
+            var canvas = new CanvasAscii(width, height)
+            {
+                MaxWidth = MaxWidth,
+                PixelWidth = PixelWidth,
+                Scale = false,
+            };
+
+            // XXX: 也许是 SkiaSharp@3.119.0 的 bug, 此处像素值一定是非预乘的格式
+            for (var x = 0; x < image.Width; x++)
+            {
+                for (var y = 0; y < image.Height; y++)
+                {
+                    var p = image.GetPixel(x, y);
+                    if (p.Alpha == 0) continue;
+                    float a = p.Alpha / 255f;
+                    byte r = (byte)(p.Red * a);
+                    byte g = (byte)(p.Green * a);
+                    byte b = (byte)(p.Blue * a);
+                    canvas.SetPixel(x, y, new(r, g, b));
+                }
+            }
+
+            return ((IRenderable)canvas).Render(options, maxWidth);
+        }
+    }
+}

SpineViewerCLI/PreviewCommand.cs

@@ -99,8 +99,7 @@ namespace SpineViewerCLI
 
             using var exporter = GetExporterFilledWithArgs(result, spine);
             using var skImage = exporter.ExportMemoryImage(spine);
-            using var skData = skImage.Encode();
-            var img = new CanvasImage(skData.AsSpan());
+            var img = new CanvasImageAscii(skImage);
             AnsiConsole.Write(img);
         }
 

SpineViewerCLI/SpineViewerCLI.csproj

@@ -18,7 +18,6 @@
     <ItemGroup>
       <PackageReference Include="NLog" Version="5.4.0" />
       <PackageReference Include="Spectre.Console" Version="0.52.0" />
-      <PackageReference Include="Spectre.Console.ImageSharp" Version="0.52.0" />
       <PackageReference Include="System.CommandLine" Version="2.0.0-rc.2.25502.107" />
     </ItemGroup>