93 lines
3.8 KiB
C#
93 lines
3.8 KiB
C#
using SkiaSharp;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Media;
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using System.Windows;
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using System.Windows.Media.Imaging;
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using System.Runtime.InteropServices;
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namespace SpineViewer.Extensions
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{
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public static class WpfExtension
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{
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/// <summary>
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/// 从本地 WebP 文件读取，并保留透明度，返回一个可以直接用于 WPF Image.Source 的 BitmapSource。
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/// </summary>
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public static BitmapSource LoadWebpWithAlpha(string path)
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{
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using var stream = File.OpenRead(path);
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using var skCodec = SKCodec.Create(stream);
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// 强制指定读取格式 PixelFormats.Bgra32
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var info = skCodec.Info.WithColorType(SKColorType.Bgra8888).WithAlphaType(SKAlphaType.Unpremul);
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var pixelCount = info.Width * info.Height;
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var pixelData = new byte[pixelCount * 4];
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var result = skCodec.GetPixels(info, out pixelData);
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if (result != SKCodecResult.Success && result != SKCodecResult.IncompleteInput)
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throw new InvalidOperationException($"Failed to decode webp：{result}");
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var wb = new WriteableBitmap(info.Width, info.Height, 96, 96, PixelFormats.Bgra32, null);
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wb.WritePixels(new(0, 0, info.Width, info.Height), pixelData, info.Width * 4, 0);
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wb.Freeze();
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return wb;
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}
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//public static void SaveToFile(this BitmapSource bitmap, string path)
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//{
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// var ext = Path.GetExtension(path)?.ToLower();
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// BitmapEncoder encoder = ext switch
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// {
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// ".jpg" or ".jpeg" => new JpegBitmapEncoder(),
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// ".bmp" => new BmpBitmapEncoder(),
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// ".gif" => new GifBitmapEncoder(),
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// ".tiff" => new TiffBitmapEncoder(),
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// _ => new PngBitmapEncoder(),// 默认用 PNG
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// };
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// encoder.Frames.Add(BitmapFrame.Create(bitmap));
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// // 确保目录存在
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// var dir = Path.GetDirectoryName(path);
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// if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
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// Directory.CreateDirectory(dir);
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// // 写出文件
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// using var fs = new FileStream(path, FileMode.Create, FileAccess.Write);
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// encoder.Save(fs);
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//}
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///// <summary>
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///// 将 Bgra32/Pbgra32 格式存储为 webp 格式
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///// </summary>
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//public static void SaveToWebp(this BitmapSource source, string path, int quality = 80)
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//{
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// if (source.Format != PixelFormats.Bgra32 && source.Format != PixelFormats.Pbgra32)
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// throw new NotSupportedException($"Not supported format: {source.Format}");
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// int width = source.PixelWidth;
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// int height = source.PixelHeight;
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// int stride = width * 4;
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// var pixelData = new byte[height * stride];
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// source.CopyPixels(pixelData, stride, 0);
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// var alphaType = source.Format == PixelFormats.Pbgra32 ? SKAlphaType.Premul : SKAlphaType.Unpremul;
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// var info = new SKImageInfo(width, height, SKColorType.Bgra8888, alphaType);
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// using var skBitmap = new SKBitmap(info);
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// Marshal.Copy(pixelData, 0, skBitmap.GetPixels(), pixelData.Length);
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// using var skImage = SKImage.FromBitmap(skBitmap);
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// using var data = skImage.Encode(SKEncodedImageFormat.Webp, quality);
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// // using var data = skImage.Encode(new SKWebpEncoderOptions(SKWebpEncoderCompression.Lossless, 100));
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// Directory.CreateDirectory(Path.GetDirectoryName(path) ?? "");
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// using var stream = File.OpenWrite(path);
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// data.SaveTo(stream);
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//}
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}
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}
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