/// <summary>
/// 提供图片转码
/// </summary>
/// <param name="SourceFile">源文件</param>
/// <param name="DestinationFile">目标文件</param>
/// <param name="IsEnableScale">是否启用缩放</param>
/// <param name="ScaleWidth">缩放宽度</param>
/// <param name="ScaleHeight">缩放高度</param>
/// <param name="InterpolationMode">插值模式</param>
/// <returns></returns>
public static async Task TranscodeFromImageAsync(FileSystemStorageItemBase SourceFile, FileSystemStorageItemBase DestinationFile, bool IsEnableScale = false, uint ScaleWidth = default, uint ScaleHeight = default, BitmapInterpolationMode InterpolationMode = default)
{
IsAnyTransformTaskRunning = true;
using (IRandomAccessStream OriginStream = await SourceFile.GetRandomAccessStreamFromFileAsync(FileAccessMode.Read).ConfigureAwait(false))
{
try
{
BitmapDecoder Decoder = await BitmapDecoder.CreateAsync(OriginStream);
using (SoftwareBitmap TranscodeImage = await Decoder.GetSoftwareBitmapAsync())
using (IRandomAccessStream TargetStream = await DestinationFile.GetRandomAccessStreamFromFileAsync(FileAccessMode.ReadWrite).ConfigureAwait(false))
{
BitmapEncoder Encoder = DestinationFile.Type.ToLower() switch
{
".png" => await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, TargetStream),
".jpg" => await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, TargetStream),
".bmp" => await BitmapEncoder.CreateAsync(BitmapEncoder.BmpEncoderId, TargetStream),
".heic" => await BitmapEncoder.CreateAsync(BitmapEncoder.HeifEncoderId, TargetStream),
".tiff" => await BitmapEncoder.CreateAsync(BitmapEncoder.TiffEncoderId, TargetStream),
_ => throw new InvalidOperationException("Unsupport image format"),
};
if (IsEnableScale)
{
Encoder.BitmapTransform.ScaledWidth = ScaleWidth;
Encoder.BitmapTransform.ScaledHeight = ScaleHeight;
Encoder.BitmapTransform.InterpolationMode = InterpolationMode;
}
Encoder.SetSoftwareBitmap(TranscodeImage);
await Encoder.FlushAsync();
}
}
catch (Exception)
{
DestinationFile.PermanentDelete();
await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() =>
{
QueueContentDialog dialog = new QueueContentDialog
{
Title = Globalization.GetString("Common_Dialog_ErrorTitle"),
Content = Globalization.GetString("EnDecode_Dialog_Content"),
CloseButtonText = Globalization.GetString("Common_Dialog_CloseButton")
};
_ = await dialog.ShowAsync().ConfigureAwait(true);
});
}
}
IsAnyTransformTaskRunning = false;
}
