private static void ConvertWebPToImage(string path, ISupportedImageFormat format, string formatString)
{
byte[] b_image;
try
{
b_image = File.ReadAllBytes(path);
}
catch (Exception e)
{
MessageBox.Show("读入图片时出现错误:\n" + e.Message, "错误", MessageBoxButton.OK, MessageBoxImage.Error);
return;
}
using (MemoryStream inStream = new MemoryStream(b_image))
{
using (ImageFactory imageFactory = new ImageFactory(preserveExifData: true))
{
string savePath = Path.GetDirectoryName(path) + @"/" + Path.GetFileNameWithoutExtension(path) + formatString;
try
{
WebPFormat webpFormat = new WebPFormat();
imageFactory.Load(webpFormat.Load(inStream)).Format(format).Save(savePath);
}
catch (Exception e)
{
MessageBox.Show("转换时出现错误:\n" + e.Message, "错误", MessageBoxButton.OK, MessageBoxImage.Error);
return;
}
}
}
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ImageSource> context, LoadingPipeDelegate <ImageSource> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
if (!stream.CanSeek)
{
var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
stream = memoryStream;
}
var isWebP = IsWebP(stream);
var tcs = new TaskCompletionSource <ImageSource>();
await Task.Run(() =>
{
Image webPImage = null;
if (isWebP)
{
var webPFormat = new WebPFormat();
webPImage = webPFormat.Load(stream);
}
if (webPImage != null)
{
var webPMemoryStream = new MemoryStream();
webPImage.Save(webPMemoryStream, ImageFormat.Png);
stream = webPMemoryStream;
}
stream.Seek(0, SeekOrigin.Begin);
try
{
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = stream;
bitmap.EndInit();
bitmap.Freeze();
context.UIContext.Send(state =>
{
context.AttachSource(bitmap);
}, null);
tcs.SetResult(bitmap);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
}, cancellationToken);
context.Current = await tcs.Task;
}
await next(context, cancellationToken);
}
private async void ConvertWebPToImage(string path, ISupportedImageFormat format, string formatString)
{
byte[] b_image;
try
{
b_image = File.ReadAllBytes(path);
}
catch (Exception e)
{
await this.ShowMessageAsync("错误", "读入图片时发生错误: " + e.Message, MessageDialogStyle.Affirmative, generalDialogSetting);
return;
}
using (MemoryStream inStream = new MemoryStream(b_image))
{
using (ImageFactory imageFactory = new ImageFactory(preserveExifData: true))
{
string savePath = Path.GetDirectoryName(path) + @"/" + Path.GetFileNameWithoutExtension(path) + formatString;
if (File.Exists(savePath))
{
var existDialogRes = await this.ShowMessageAsync("文件已存在", "将要保存的文件: " + savePath + " 已存在，是否覆盖？", MessageDialogStyle.AffirmativeAndNegative, new MetroDialogSettings()
{
AffirmativeButtonText = "覆盖",
NegativeButtonText = "取消",
DialogTitleFontSize = 16
});
if (!(existDialogRes == MessageDialogResult.Affirmative))
{
return;
}
}
try
{
WebPFormat webpFormat = new WebPFormat();
imageFactory.Load(webpFormat.Load(inStream)).Format(format).Save(savePath);
}
catch (Exception e)
{
await this.ShowMessageAsync("错误", "转换时发生错误: " + e.Message, MessageDialogStyle.Affirmative, generalDialogSetting);
return;
}
await this.ShowMessageAsync("转换完成", "图片已转换完成。", MessageDialogStyle.Affirmative, generalDialogSetting);
}
}
}
public static Bitmap loadBitmap(string path, string extension, int sizeX = -1, int sizeY = -1)
{
Bitmap bitmap;
if (extension == ".webp")
{
WebPFormat webpDecoder = new WebPFormat();
bitmap = (Bitmap)webpDecoder.Load(File.Open(path, FileMode.Open));
}
else
{
if (sizeX == -1 || sizeY == -1)
{
bitmap = new Bitmap(Image.FromFile(path), new Size(Settings.Accuracy, Settings.Accuracy));
}
else
{
bitmap = new Bitmap(Image.FromFile(path), new Size(sizeX, sizeY));
}
}
return(bitmap);
}