53 lines
1.8 KiB
C#
53 lines
1.8 KiB
C#
using SixLabors.ImageSharp;
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using SixLabors.ImageSharp.Formats;
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using SixLabors.ImageSharp.PixelFormats;
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using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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namespace LibationUiBase
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{
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public class IcoEncoder : IImageEncoder
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{
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public bool SkipMetadata { get; init; } = true;
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public void Encode<TPixel>(Image<TPixel> image, Stream stream) where TPixel : unmanaged, IPixel<TPixel>
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{
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// https://stackoverflow.com/a/21389253
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using var ms = new MemoryStream();
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//Knowing the image size ahead of time removes the
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//requirement of the output stream to support seeking.
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image.SaveAsPng(ms);
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//Disposing of the BinaryWriter disposes the soutput stream. Let the caller clean up.
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var bw = new BinaryWriter(stream);
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// Header
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bw.Write((short)0); // 0-1 : reserved
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bw.Write((short)1); // 2-3 : 1=ico, 2=cur
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bw.Write((short)1); // 4-5 : number of images
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// Image directory
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var w = image.Width;
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if (w >= 256) w = 0;
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bw.Write((byte)w); // 0 : width of image
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var h = image.Height;
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if (h >= 256) h = 0;
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bw.Write((byte)h); // 1 : height of image
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bw.Write((byte)0); // 2 : number of colors in palette
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bw.Write((byte)0); // 3 : reserved
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bw.Write((short)0); // 4 : number of color planes
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bw.Write((short)0); // 6 : bits per pixel
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bw.Write((int)ms.Position); // 8 : image size
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bw.Write((int)stream.Position + 4); // 12: offset of image data
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ms.Position = 0;
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ms.CopyTo(stream); // Image data
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}
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public Task EncodeAsync<TPixel>(Image<TPixel> image, Stream stream, CancellationToken cancellationToken) where TPixel : unmanaged, IPixel<TPixel>
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=> throw new NotImplementedException();
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}
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}
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