private Stream GetResizedImage(Stream originalStream, ImageSize size, string fileName)
{
BitmapFrame frame = ImageHelper.ReadBitmapFrame(originalStream);
BitmapFrame resizedFrame = frame.ResizeImage(size.Width, size.Height);
if (Settings.UseLocalCache)
{
string name = ResolveFileName(fileName, size.ToString());
resizedFrame.SaveToFile(name);
return OpenImageStream(name);
}
return resizedFrame.GetStream();
}
private Stream GetResultStream(Uri uri, ImageSize imageSize)
{
if (Settings.UseLocalCache)
{
string requestFileName = GetDownloadPath(uri);
string cachedFileName = ResolveFileName(requestFileName, imageSize.ToString());
// looking for cached file on disk
if (File.Exists(cachedFileName))
{
return OpenImageStream(cachedFileName);
}
// looking for original file on disk
string original = ResolveFileName(requestFileName, ImageSize.OriginalImageSize);
if (File.Exists(original))
{
return GetResizedImage(OpenImageStream(original), imageSize, requestFileName);
}
}
return GetImageStream(uri, imageSize);
}
private Stream GetImageStream(Uri uri, ImageSize imageSize)
{
try
{
var request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.UserAgent = Settings.UserAgent;
using (var response = request.GetResponse())
{
var imageStream = new MemoryStream();
using (var responseStream = response.GetResponseStream())
{
responseStream.CopyTo(imageStream);
imageStream.Position = 0;
}
if (Settings.UseLocalCache)
{
SaveOriginalFileToDisk(imageStream, uri);
}
return (imageSize.Name == ImageSize.OriginalImageSize) ?
imageStream :
GetResizedImage(imageStream, imageSize, GetDownloadPath(uri));
}
}
catch (Exception exc)
{
Trace.TraceError(exc.ToString());
return GetErrorStream();
}
}