/// <summary>
/// Converts a DeepZoom image back into an ordinary bitmap.
/// </summary>
/// <param name="dziPath">the path (relative or absolute) to the DZI file to convert</param>
/// <returns>an absolute path to the resulting image within this image creator's working directory</returns>
public String UnDeepZoomImage(String dziUri)
{
try
{
using (WebClient webClient = new WebClient())
{
String baseName = Path.GetFileNameWithoutExtension(UriUtility.GetFileName(dziUri));
String finalImagePath = Path.Combine(this.WorkingDirectory, baseName + StandardImageFormatExtension);
if (File.Exists(finalImagePath))
{
return(finalImagePath);
}
String filesDirectoryUri = UriUtility.ExpandRelativeUri(dziUri, baseName + "_files");
String dziText = UriUtility.DownloadString(webClient, dziUri);
XPathHelper dzi = new XPathHelper(dziText);
String xmlns = this.DetermineNamespace(dziText);
if (xmlns != null)
{
dzi.AddNamespace("d", xmlns);
}
String format = dzi.FindString("//d:Image/@Format");
int tileSize = dzi.FindInt("//d:Image/@TileSize");
int overlap = dzi.FindInt("//d:Image/@Overlap");
int width = dzi.FindInt("//d:Size/@Width");
int height = dzi.FindInt("//d:Size/@Height");
int maxLevel = (int)Math.Ceiling(Math.Log(Math.Max(width, height), 2));
Bitmap finalImage = new Bitmap(width, height);
Graphics finalImageGraphics = Graphics.FromImage(finalImage);
int colCount = (int)Math.Ceiling((double)width / tileSize);
int rowCount = (int)Math.Ceiling((double)height / tileSize);
for (int row = 0; row < rowCount; row++)
{
for (int col = 0; col < colCount; col++)
{
String tileName = col + "_" + row + "." + format;
Uri tileUri = new Uri(filesDirectoryUri + "/" + maxLevel + "/" + tileName);
Stream imageStream = null;
try
{
imageStream = webClient.OpenRead(tileUri);
Bitmap tile = new Bitmap(imageStream);
float tileX = col * (tileSize);
float tileY = row * (tileSize);
finalImageGraphics.DrawImage(tile, tileX, tileY);
}
catch (WebException)
{
Log.Warning("Could not find tile {0}, {1} for DZI {2}. " +
"The image for this tile may be incomplete.", col, row, dziUri);
throw;
}
finally
{
if (imageStream != null)
{
imageStream.Close();
}
}
}
}
finalImage.Save(finalImagePath, StandardImageFormat);
return(finalImagePath);
}
}
catch (XPathException e)
{
throw new PauthorException("Unable to decode DZI: " + dziUri, e);
}
catch (Exception e)
{
throw new PauthorException("Unable to un-deepzoom DZI: " + dziUri, e);
}
}
