/// <summary>
/// Refreshes file metadata like size, dimensions etc.
/// </summary>
/// <param name="stream">The file stream (can be null)</param>
public static void RefreshMetadata(this MediaFile file, Stream stream, IImageFactory imageFactory)
{
Guard.NotNull(file, nameof(file));
file.Size = stream != null ? (int)stream.Length : 0;
file.Width = null;
file.Height = null;
file.PixelSize = null;
if (stream != null && file.MediaType == MediaType.Image)
{
try
{
var size = ImageHeader.GetPixelSize(stream, file.MimeType);
file.Width = size.Width;
file.Height = size.Height;
file.PixelSize = size.Width * size.Height;
}
catch
{
// Don't attempt again
file.Width = 0;
file.Height = 0;
file.PixelSize = 0;
}
}
}
private async Task EnsureMetadataResolvedAsync(MediaFile file, bool saveOnResolve)
{
var mediaType = _typeResolver.Resolve(file.Extension, file.MimeType);
var resolveDimensions = mediaType == MediaType.Image && file.Width == null && file.Height == null;
var resolveSize = file.Size <= 0;
Stream stream = null;
if (resolveDimensions || resolveSize)
{
stream = await _storageProvider.OpenReadAsync(file);
}
// Resolve image dimensions
if (stream != null)
{
try
{
if (resolveSize)
{
file.Size = (int)stream.Length;
}
if (resolveDimensions)
{
var size = ImageHeader.GetPixelSize(stream, file.MimeType, true);
file.Width = size.Width;
file.Height = size.Height;
file.PixelSize = size.Width * size.Height;
}
if (saveOnResolve && (resolveSize || resolveDimensions))
{
try
{
_db.TryUpdate(file);
await _db.SaveChangesAsync();
}
catch (InvalidOperationException ioe)
{
// Ignore exception for pictures that already have been processed.
if (!ioe.IsAlreadyAttachedEntityException())
{
throw;
}
}
}
}
finally
{
stream.Dispose();
}
}
}
protected async Task <AsyncOut <IImage> > ProcessImage(MediaFile file, Stream inStream)
{
var originalSize = Size.Empty;
var format = _imageProcessor.Factory.FindFormatByExtension(file.Extension) ?? new UnsupportedImageFormat(file.MimeType, file.Extension);
try
{
originalSize = ImageHeader.GetPixelSize(inStream, file.MimeType);
}
catch
{
}
IImage outImage;
if (format is UnsupportedImageFormat)
{
outImage = new ImageWrapper(inStream, originalSize, format);
return(new AsyncOut <IImage>(true, outImage));
}
var maxSize = _mediaSettings.MaximumImageSize;
var query = new ProcessImageQuery(inStream)
{
Format = file.Extension,
DisposeSource = true,
ExecutePostProcessor = ImagePostProcessingEnabled,
IsValidationMode = true
};
if (originalSize.IsEmpty || (originalSize.Height <= maxSize && originalSize.Width <= maxSize))
{
// Give subscribers the chance to (pre)-process
var evt = new ImageUploadedEvent(query, originalSize);
await _eventPublisher.PublishAsync(evt);
outImage = evt.ResultImage ?? new ImageWrapper(inStream, originalSize, format);
return(new AsyncOut <IImage>(true, outImage));
}
query.MaxSize = maxSize;
using (var result = await _imageProcessor.ProcessImageAsync(query, false))
{
outImage = result.Image;
return(new AsyncOut <IImage>(true, outImage));
}
}
