/// <summary>
/// Generates content item visual and makes a picture of it
/// </summary>
/// <param name="_title">String containing title of the content item</param>
/// <param name="_url">Uri of the media element of the content item</param>
/// <param name="_desc">String contanting the description of the content item</param>
/// <param name="initialSize">Initial size of the content item</param>
/// <returns>BitmapSource with image of the content item of the specified size</returns>
internal static BitmapSource[] MakeThumbs(ContentItem ciData, Size[] sizes, Size initialSize)
{
if (ciData.thumbnail == null)
{
ciData.thumbnail = Thumbs.GetMediaThumbnail(ciData);
}
if (ciData.thumbnail == null)
{
// cannot create thumbnail
return(null);
}
ContentItemControl element = new ContentItemControl();
element.Height = initialSize.Height;
element.Width = initialSize.Width;
element.Data = ciData;
element.Measure(initialSize);
element.Arrange(new Rect(initialSize));
BitmapSource bmpSource = CreateBitmapSourceFromVisual(initialSize, element);
return(CreateResizedBitmapSources(bmpSource, sizes));
}
/// <summary>
/// Create thumbs for specific item
/// </summary>
/// <param name="ciGuid">ContentItem to create thumbnail of</param>
public void MakeThumbsForItem(ContentItem ci)
{
MediaTypes mt = MediaType.GetMediaType(ci.MediaTypeID);
if (mt == MediaTypes.Video || mt == MediaTypes.Image || mt == MediaTypes.PDF || mt == MediaTypes.Photosynth)
{
mrLogger.Log("Making thumbs for content item with id " + ci.ID.ToString());
// Create bitmaps of Infodot
BitmapSource[] resultBmps = Thumbs.MakeThumbs(ci, Utils.GetSizes(), InitialSize);
if (resultBmps == null)
{
string c = "Cannot create thumbnails for Content Item with ID " + ci.ID.ToString() + ", skipping.";
Console.WriteLine(c);
mrLogger.Log(c);
return;
}
// Save thumbnails
foreach (BitmapSource bmp in resultBmps)
{
SaveThumbnailAsPng(bmp, ci.ID);
}
}
else
{
string ms = "Media Type for Content Item " + ci.ID.ToString() + " is not supported";
Console.WriteLine(ms);
mrLogger.Log(ms);
}
}
/// <summary>
/// Delete blob if it exists
/// </summary>
/// <param name="id">Id of the ContentItem for which blob was created</param>
public void DeleteThumbsForItemID(Guid id)
{
foreach (Size s in Utils.GetSizes())
{
String p = Thumbs.GenerateThumbnailUrlString(id, s.Width.ToString());
mrLogger.Log("Performing deletion of thumbnails with path " + p);
// Get name of the blob
CloudBlob blob = blobContainer.GetBlobReference(p);
blob.DeleteIfExists();
}
}
private void SaveThumbnailAsPng(Stream remoteStream, Guid id)
{
CloudBlob blob = blobContainer.GetBlobReference(Thumbs.GenerateThumbnailUrlString(id, remoteStream.Length.ToString()));
mrLogger.Log("Azure: started uploading png picture to the blob: " + blob.Uri);
// Upload a file from the memory stream to the blob.
blob.UploadFromStream(remoteStream);
blob.Properties.ContentType = "image/png";
blob.SetProperties();
mrLogger.Log("Azure: finishing uploading blob");
}
/// <summary>
/// Check whether thumbnail exists for specified contentitem id
/// </summary>
/// <param name="id">ContentItem Id</param>
/// <returns>True if all thumbnails for specified ContentItem id exist, False if any of them doesn't</returns>
private bool CheckThumbnailExistenceByItemID(Guid id)
{
foreach (Size s in Utils.GetSizes())
{
// Get name of the blob
CloudBlob blob = blobContainer.GetBlobReference(Thumbs.GenerateThumbnailUrlString(id, s.Width.ToString()));
// Check it existence
if (!BlobExists(blob))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Connects to blob storage and saves bitmap under the specified path with given name
/// </summary>
/// <param name="bmp">BitmapSource to upload into the blob</param>
/// <param name="relativePath"></param>
/// <param name="filename"></param>
private void SaveThumbnailAsPng(BitmapSource bmp, Guid id)
{
using (var stream = new MemoryStream())
{
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Interlace = PngInterlaceOption.On;
encoder.Frames.Add(BitmapFrame.Create(bmp));
encoder.Save(stream);
stream.Seek(0, SeekOrigin.Begin);
CloudBlob blob = blobContainer.GetBlobReference(Thumbs.GenerateThumbnailUrlString(id, bmp.Width.ToString()));
mrLogger.Log("Azure: started uploading png picture to the blob: " + blob.Uri);
// Upload a file from the memory stream to the blob.
blob.UploadFromStream(stream);
blob.Properties.ContentType = "image/png";
blob.SetProperties();
mrLogger.Log("Azure: finishing uploading blob");
}
}
