public async Task InitializeAsync(Uri manifestUri, CancellationToken cancellationToken)
{
if (manifestUri == null)
{
throw new ArgumentNullException(nameof(manifestUri));
}
// Parse DZI file.
_manifest = await InitializeManifestAsync(manifestUri).ConfigureAwait(false);
// Calculate Deep Zoom layers
_layers = DeepZoomHelper.CalculateDeepZoomLayers(_manifest.Width, _manifest.Height);
// Get output file ready
_stream = new FileStream(_outputFile, FileMode.Create, FileAccess.ReadWrite);
_fileWriter = await TiffFileWriter.OpenAsync(_stream, leaveOpen : true, useBigTiff : UseBigTiff).ConfigureAwait(false);
}
protected override async Task <DeepZoomManifest> InitializeManifestAsync(Uri manifestUri)
{
string filename = GetFileNameFromUri(manifestUri);
_baseUri = new Uri(manifestUri, "./");
_baseName = Path.ChangeExtension(filename, null);
if (!".dzi".Equals(Path.GetExtension(filename), StringComparison.OrdinalIgnoreCase) &&
!".xml".Equals(Path.GetExtension(filename), StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException(nameof(manifestUri), $"{filename} is not a dzi file.");
}
using (var ms = new MemoryStream())
{
await GetUriContentAsync(manifestUri, ms).ConfigureAwait(false);
ms.Seek(0, SeekOrigin.Begin);
return(await DeepZoomManifest.ParseAsync(ms).ConfigureAwait(false));
}
}
public static async Task <DeepZoomManifest> ParseAsync(Stream stream)
{
DeepZoomManifest manifest = new DeepZoomManifest();
string tmp;
using (var reader = XmlReader.Create(stream, new XmlReaderSettings {
Async = true
}))
{
while (await reader.ReadAsync().ConfigureAwait(false))
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name == "Image")
{
manifest.Format = reader.GetAttribute("Format");
tmp = reader.GetAttribute("TileSize");
int.TryParse(tmp, out int tileSize);
manifest.TileSize = tileSize;
tmp = reader.GetAttribute("Overlap");
int.TryParse(tmp, out int overlap);
manifest.Overlap = overlap;
}
else if (reader.Name == "Size")
{
tmp = reader.GetAttribute("Width");
int.TryParse(tmp, out int width);
manifest.Width = width;
tmp = reader.GetAttribute("Height");
int.TryParse(tmp, out int height);
manifest.Height = height;
}
}
}
}
return(manifest);
}
protected override async Task <DeepZoomManifest> InitializeManifestAsync(Uri manifestUri)
{
string filename = GetFileNameFromUri(manifestUri);
_baseUri = new Uri(manifestUri, "./");
_baseName = Path.ChangeExtension(filename, null);
// Deep Zoom format
if (".dzi".Equals(Path.GetExtension(filename), StringComparison.OrdinalIgnoreCase) ||
".xml".Equals(Path.GetExtension(filename), StringComparison.OrdinalIgnoreCase))
{
using (var ms = new MemoryStream())
{
await GetUriContentAsync(manifestUri, ms).ConfigureAwait(false);
ms.Seek(0, SeekOrigin.Begin);
return(await DeepZoomManifest.ParseAsync(ms).ConfigureAwait(false));
}
}
// local TIFF file
if ("file".Equals(manifestUri.Scheme, StringComparison.OrdinalIgnoreCase))
{
TiffFileReader?tiff = null;
try
{
tiff = await TiffFileReader.OpenAsync(manifestUri.LocalPath).ConfigureAwait(false);
TiffImageDecoder decoder = await tiff.CreateImageDecoderAsync().ConfigureAwait(false);
_tiff = tiff;
_decoder = decoder;
tiff = null;
return(new DeepZoomManifest {
Format = "jpeg", Width = decoder.Width, Height = decoder.Height, TileSize = 256, Overlap = 0
});
}
catch (InvalidDataException)
{
// Do nothing
}
finally
{
if (!(tiff is null))
{
await tiff.DisposeAsync().ConfigureAwait(false);
}
}
}
// Other images
if ("file".Equals(manifestUri.Scheme, StringComparison.OrdinalIgnoreCase))
{
try
{
_image = Image.Load <Rgb24>(manifestUri.LocalPath);
return(new DeepZoomManifest {
Format = "jpeg", Width = _image.Width, Height = _image.Height, TileSize = 256, Overlap = 0
});
}
catch (Exception)
{
// Do nothing
}
}
throw new ArgumentException(nameof(manifestUri), $"{filename} is not a dzi file.");
}
