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内置 wmf 转换支持
1 parent 46cfb5e commit 9ed2b89

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Lines changed: 330 additions & 2 deletions

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‎src/MediaConverters/MediaConverters.Lib/Imaging/Optimizations/EnhancedGraphicsMetafileOptimization.cs‎

Lines changed: 157 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,157 @@
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using System;
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using System.Diagnostics;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Runtime.Versioning;
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namespace DotNetCampus.MediaConverters.Imaging.Optimizations;
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/// <summary>
11+
/// 增强图元优化方法，用于优化 emf 和 wmf 图片
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/// </summary>
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public static class EnhancedGraphicsMetafileOptimization
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{
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public static ImageFileOptimizationResult ConvertWmfOrEmfToPngFile(FileInfo file, DirectoryInfo workingFolder)
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{
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// 在 Windows 上，直接使用 GDI+ 将 WMF 或 EMF 文件转换为 PNG 文件
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if (OperatingSystem.IsWindowsVersionAtLeast(6, 1))
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{
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return ConvertInWindows(file, workingFolder);
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}
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if (OperatingSystem.IsLinux())
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{
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// 在 Linux 上，先尝试使用 Inkscape 进行转换，如失败，再使用 libwmf 进行转换
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return ConvertInLinux(file, workingFolder);
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}
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return new ImageFileOptimizationResult()
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{
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OptimizedImageFile = null,
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FailureReason = ImageFileOptimizationFailureReason.NotSupported
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};
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}
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[SupportedOSPlatform("linux")]
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private static ImageFileOptimizationResult ConvertInLinux(FileInfo file, DirectoryInfo workingFolder)
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{
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// 在 Linux 上，先尝试使用 Inkscape 进行转换，如失败，再使用 libwmf 进行转换
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// 调用 Inkscape 进行转换
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var svgFile = Path.Join(workingFolder.FullName, $"{Path.GetFileNameWithoutExtension(file.Name)}_{Path.GetRandomFileName()}.svg");
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{
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var processStartInfo = new ProcessStartInfo("inkscape")
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{
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ArgumentList =
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{
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"--export-plain-svg",
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$"--export-filename={svgFile}",
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file.FullName,
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}
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};
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try
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{
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using var process = Process.Start(processStartInfo);
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process?.WaitForExit(TimeSpan.FromSeconds(5));
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if (process?.ExitCode == 0 && File.Exists(svgFile))
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{
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// 转换成功，再次执行 SVG 转 PNG 的转换
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var convertSvgToPngFile = ImageFileOptimization.ConvertSvgToPngFile(new FileInfo(svgFile), workingFolder);
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if (convertSvgToPngFile is not null)
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{
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return new ImageFileOptimizationResult()
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{
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OptimizedImageFile = convertSvgToPngFile
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};
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}
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}
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}
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catch (Exception e)
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{
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// 失败了，继续调用 libwmf 进行转换
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}
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}
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// 继续执行 libwmf 的转换，此时不支持 emf 格式
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if (string.Equals(file.Extension, ".emf"))
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{
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return new ImageFileOptimizationResult()
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{
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OptimizedImageFile = null,
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FailureReason = ImageFileOptimizationFailureReason.NotSupported
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};
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}
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// 使用 libwmf 进行转换
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{
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// ./wmf2svg -o 1.svg image.wmf
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var processStartInfo = new ProcessStartInfo("wmf2svg")
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{
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ArgumentList =
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{
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"-o",
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svgFile,
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file.FullName,
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}
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};
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var fontFolder = Path.Join(AppContext.BaseDirectory, "fonts");
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if (Directory.Exists(fontFolder))
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{
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processStartInfo.ArgumentList.Add($"--wmf-fontdir={fontFolder}");
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}
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using var process = Process.Start(processStartInfo);
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process?.WaitForExit(TimeSpan.FromSeconds(5));
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if (process?.ExitCode == 0 && File.Exists(svgFile))
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{
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// 转换成功，再次执行 SVG 转 PNG 的转换
111+
var convertedFile = ImageFileOptimization.FixSvgInvalidCharacter(new FileInfo(svgFile),workingFolder);
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113+
var convertSvgToPngFile = ImageFileOptimization.ConvertSvgToPngFile(convertedFile, workingFolder);
114+
if (convertSvgToPngFile is not null)
115+
{
116+
return new ImageFileOptimizationResult()
117+
{
118+
OptimizedImageFile = convertSvgToPngFile
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};
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}
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}
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}
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return new ImageFileOptimizationResult()
125+
{
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OptimizedImageFile = null,
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FailureReason = ImageFileOptimizationFailureReason.NotSupported
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};
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}
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[SupportedOSPlatform("windows6.1")]
132+
private static ImageFileOptimizationResult ConvertInWindows(FileInfo file, DirectoryInfo workingFolder)
133+
{
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try
135+
{
136+
using var emf = new Bitmap(file.FullName);
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var convertedFile = Path.Join(workingFolder.FullName, $"GDI_{Path.GetRandomFileName()}.png");
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// 将增强型图形元文件转成位图。
140+
emf.Save(convertedFile, ImageFormat.Png);
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return new ImageFileOptimizationResult()
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{
144+
OptimizedImageFile = new FileInfo(convertedFile),
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};
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}
147+
catch (Exception e)
148+
{
149+
return new ImageFileOptimizationResult
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{
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OptimizedImageFile = null,
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Exception = e,
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FailureReason = ImageFileOptimizationFailureReason.GdiException
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};
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}
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}
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}

‎src/MediaConverters/MediaConverters.Lib/Imaging/Optimizations/ImageFileOptimization.cs‎

Lines changed: 133 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -5,10 +5,16 @@
55
using SixLabors.ImageSharp.PixelFormats;
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using SixLabors.ImageSharp.Processing;
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8+
using SkiaSharp;
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10+
using Svg.Skia;
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812
using System;
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using System.IO;
1014
using System.Linq;
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using System.Threading;
1116
using System.Threading.Tasks;
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using System.Xml.Linq;
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namespace DotNetCampus.MediaConverters.Imaging.Optimizations;
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@@ -44,11 +50,42 @@ public static async Task<ImageFileOptimizationResult> OptimizeImageFileAsync(Fil
4450
var file = imageFile;
4551
if (copyNewFile)
4652
{
47-
var newFilePath = Path.Join(workingFolder.FullName, $"{Path.GetRandomFileName()}_{imageFile.Name}");
53+
var newFilePath = Path.Join(workingFolder.FullName, $"Copy_{Path.GetRandomFileName()}_{imageFile.Name}");
4854
file.CopyTo(newFilePath);
4955
file = new FileInfo(newFilePath);
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}
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58+
if (IsExtension(".svg"))
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{
60+
// 如果是 svg 那就直接转换了，因为后续叠加特效等逻辑都不能支持 SVG 格式
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var outputFilePath = ConvertSvgToPngFile(file, workingFolder);
62+
if (outputFilePath is null)
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{
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return new ImageFileOptimizationResult()
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{
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OptimizedImageFile = null,
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FailureReason = ImageFileOptimizationFailureReason.NotSupported
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};
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}
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else
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{
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file = outputFilePath;
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}
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}
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else if (IsExtension(".wmf") ||
76+
IsExtension(".emf"))
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{
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var result = EnhancedGraphicsMetafileOptimization.ConvertWmfOrEmfToPngFile(file, workingFolder);
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if (result.OptimizedImageFile is not null)
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{
81+
file = result.OptimizedImageFile;
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}
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else
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{
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return result;
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}
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}
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5289
Image<Rgba32> image;
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try
5491
{
@@ -112,6 +149,11 @@ public static async Task<ImageFileOptimizationResult> OptimizeImageFileAsync(Fil
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image.Dispose();
113150
throw;
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}
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bool IsExtension(string extension)
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{
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return string.Equals(file.Extension, extension, StringComparison.OrdinalIgnoreCase);
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}
115157
}
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/// <summary>
@@ -221,4 +263,94 @@ public static void LimitImageSize(Image<Rgba32> image, int? maxImageWidth, int?
221263
/// 图片压缩的最大高度
222264
/// </summary>
223265
private const int MaxHeight = 2160;
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267+
/// <summary>
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/// 转换 svg 文件为 png 文件
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/// </summary>
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/// <param name="imageFile"></param>
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/// <param name="workingFolder"></param>
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/// <returns></returns>
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public static FileInfo? ConvertSvgToPngFile(FileInfo imageFile,
274+
DirectoryInfo workingFolder)
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{
276+
using var skSvg = new SKSvg();
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using var skPicture = skSvg.Load(imageFile.FullName);
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var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(imageFile.Name);
279+
var outputFile = Path.Join(workingFolder.FullName, $"SVG_{Path.GetRandomFileName()}_{fileNameWithoutExtension}.png");
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var canSave = skSvg.Save(outputFile, SKColors.Transparent);
281+
if (canSave && File.Exists(outputFile))
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{
283+
return new FileInfo(outputFile);
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}
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// 转换失败
287+
return null;
288+
}
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public static async Task<FileInfo> FixSvgInvalidCharacterAsync(FileInfo svgFile,
291+
DirectoryInfo workingFolder)
292+
{
293+
using var fileStream = svgFile.OpenRead();
294+
using var streamReader = new StreamReader(fileStream);
295+
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var xDocument = await XDocument.LoadAsync(streamReader, LoadOptions.SetLineInfo, CancellationToken.None);
297+
bool anyUpdate = false;
298+
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foreach (var xElement in xDocument.Descendants("text"))
300+
{
301+
var value = xElement.Value;
302+
if (!string.IsNullOrEmpty(value) && value.Length > 0 && value[0] is var c && c == 0xFFFD)
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{
304+
// 0xFFFFD 是 utf8 特殊字符
305+
// 画出来就是�符号，不如删掉
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xElement.Value = string.Empty;
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anyUpdate = true;
309+
}
310+
}
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312+
if (anyUpdate)
313+
{
314+
var convertedFile = Path.Join(workingFolder.FullName, $"FixSVG_{Path.GetRandomFileName()}.svg");
315+
using var stream = File.Create(convertedFile);
316+
await xDocument.SaveAsync(stream, SaveOptions.None, CancellationToken.None);
317+
return new FileInfo(convertedFile);
318+
}
319+
320+
// 啥都不用改，返回原图
321+
return svgFile;
322+
}
323+
324+
public static FileInfo FixSvgInvalidCharacter(FileInfo svgFile,
325+
DirectoryInfo workingFolder)
326+
{
327+
using var fileStream = svgFile.OpenRead();
328+
using var streamReader = new StreamReader(fileStream);
329+
330+
var xDocument = XDocument.Load(streamReader, LoadOptions.SetLineInfo);
331+
bool anyUpdate = false;
332+
333+
foreach (var xElement in xDocument.Descendants("text"))
334+
{
335+
var value = xElement.Value;
336+
if (!string.IsNullOrEmpty(value) && value.Length > 0 && value[0] is var c && c == 0xFFFD)
337+
{
338+
// 0xFFFFD 是 utf8 特殊字符
339+
// 画出来就是�符号，不如删掉
340+
xElement.Value = string.Empty;
341+
342+
anyUpdate = true;
343+
}
344+
}
345+
346+
if (anyUpdate)
347+
{
348+
var convertedFile = Path.Join(workingFolder.FullName, $"FixSVG_{Path.GetRandomFileName()}.svg");
349+
xDocument.Save(convertedFile);
350+
return new FileInfo(convertedFile);
351+
}
352+
353+
// 啥都不用改，返回原图
354+
return svgFile;
355+
}
224356
}

‎src/MediaConverters/MediaConverters.Lib/Imaging/Optimizations/ImageFileOptimizationFailureReason.cs‎

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Original file line numberDiff line numberDiff line change
@@ -26,4 +26,9 @@ public enum ImageFileOptimizationFailureReason
2626
/// 不支持的图片格式
2727
/// </summary>
2828
NotSupported,
29+
30+
/// <summary>
31+
/// GDI 发生异常
32+
/// </summary>
33+
GdiException,
2934
}

‎src/MediaConverters/MediaConverters.Lib/MediaConverters.Lib.csproj‎

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Original file line numberDiff line numberDiff line change
@@ -11,6 +11,9 @@
1111

1212
<ItemGroup>
1313
<PackageReference Include="SixLabors.ImageSharp" Version="3.1.10" />
14+
<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="3.116.1" />
15+
<PackageReference Include="Svg.Skia" Version="3.0.4" />
16+
<PackageReference Include="System.Drawing.Common" Version="9.0.7" />
1417
</ItemGroup>
1518

1619
<PropertyGroup>

‎src/MediaConverters/MediaConverters.Tool/Contexts/MediaConverterErrorCode.cs‎

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Original file line numberDiff line numberDiff line change
@@ -38,6 +38,8 @@ public readonly record struct MediaConverterErrorCode
3838
/// </summary>
3939
public static readonly ErrorCode NotSupported = new(1004, "Not supported operation");
4040

41+
public static readonly ErrorCode GdiException = new(1005, "Gdi exception");
42+
4143
/// <summary>
4244
/// 错误代码
4345
/// </summary>
@@ -48,6 +50,7 @@ public readonly record struct MediaConverterErrorCode
4850
/// </summary>
4951
public string Message { get; init; }
5052

53+
5154
public MediaConverterErrorCode(int code, string message)
5255
{
5356
Code = code;

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