private void LoadNewPreviews(List <SearchResult> searchResults, CancellationToken token)
{
foreach (SearchResult searchResult in searchResults)
{
if (token.IsCancellationRequested)
{
return;
}
DBImage img = searchResult.AttachedImage;
_mutex.WaitOne(); // Just precaution measures, not necessary
if (!_loadedThumbnails.ContainsKey(img.Id))
{
Image thumb = CreateImagePreview(img);
if (thumb != null)
{
_loadedThumbnails.Add(img.Id, thumb);
}
}
_mutex.ReleaseMutex();
}
}
private Image CreateImagePreview(DBImage image)
{
string imagePath = _searcher.GetImageFullPath(image);
if (!File.Exists(imagePath))
{
return(null);
}
FileInfo imgFile = new FileInfo(imagePath);
if (imgFile.Length > FILE_SIZE_LIMIT)
{
return(null);
}
Image img;
using (Stream s = File.OpenRead(imgFile.FullName))
{
img = Image.FromStream(s);
}
// Get image thumbnail that stays in the boundaries of a square
// of size ROW_HEIGHT
float ratio = (float)Math.Max(img.Width, img.Height) / (float)SearchResult.ROW_HEIGHT;
int sizeX = Convert.ToInt32((float)img.Width / ratio);
int sizeY = Convert.ToInt32((float)img.Height / ratio);
Image.GetThumbnailImageAbort callback =
new Image.GetThumbnailImageAbort(() => true);
Image thumb = img.GetThumbnailImage(sizeX, sizeY, callback, IntPtr.Zero);
return(thumb);
}
