/// <summary>
/// Gets the image from the thumbnail cache. If the image is not cached,
/// null will be returned.
/// </summary>
/// <param name="guid">The guid representing this item.</param>
/// <param name="adaptor">The adaptor of this item.</param>
/// <param name="key">The key of this item.</param>
/// <param name="thumbSize">Requested thumbnail size.</param>
/// <param name="useEmbeddedThumbnails">UseEmbeddedThumbnails property of the owner control.</param>
/// <param name="autoRotate">AutoRotate property of the owner control.</param>
/// <param name="useWIC">Whether to use WIC.</param>
/// <param name="clone">true to return a clone of the cached image; otherwise false.</param>
public Image GetImage(Guid guid, ImageListView.ImageListViewItemAdaptor adaptor, object key, Size thumbSize, UseEmbeddedThumbnails useEmbeddedThumbnails, bool autoRotate, bool useWIC, bool clone)
{
CacheItem item = null;
if (thumbCache.TryGetValue(guid, out item) && item != null && item.Image != null && item.Size == thumbSize && item.UseEmbeddedThumbnails == useEmbeddedThumbnails && item.AutoRotate == autoRotate && item.UseWIC == useWIC)
return clone ? (Image)item.Image.Clone() : item.Image;
else
{
string diskCacheKey = adaptor.GetUniqueIdentifier(key, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
// Check the disk cache
using (Stream stream = diskCache.Read(diskCacheKey))
{
if (stream.Length > 0)
{
return new Bitmap(stream);
}
}
return null;
}
}
/// <summary>
/// Adds a virtual item to the cache.
/// </summary>
/// <param name="guid">The guid representing this item.</param>
/// <param name="adaptor">The adaptor for this item.</param>
/// <param name="key">The key of this item.</param>
/// <param name="thumbSize">Requested thumbnail size.</param>
/// <param name="thumb">Thumbnail image to add to cache.</param>
/// <param name="useEmbeddedThumbnails">UseEmbeddedThumbnails property of the owner control.</param>
/// <param name="autoRotate">AutoRotate property of the owner control.</param>
/// <param name="useWIC">Whether to use WIC.</param>
public void Add(Guid guid, ImageListView.ImageListViewItemAdaptor adaptor, object key, Size thumbSize, Image thumb, UseEmbeddedThumbnails useEmbeddedThumbnails, bool autoRotate, bool useWIC)
{
// Already cached?
CacheItem item = null;
if (thumbCache.TryGetValue(guid, out item))
{
if (item.Size == thumbSize && item.UseEmbeddedThumbnails == useEmbeddedThumbnails)
return;
}
// Resize
thumb = ThumbnailExtractor.FromImage(thumb, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
// Add to cache
thumbCache.Add(guid, new CacheItem(guid, thumbSize, thumb, CacheState.Cached, useEmbeddedThumbnails, autoRotate, useWIC));
// Add to disk cache
using (MemoryStream stream = new MemoryStream())
{
string diskCacheKey = adaptor.GetUniqueIdentifier(key, thumbSize, useEmbeddedThumbnails, autoRotate, useWIC);
thumb.Save(stream, System.Drawing.Imaging.ImageFormat.Png);
diskCache.Write(diskCacheKey, stream);
}
// Raise the cache events
if (mImageListView != null)
{
mImageListView.OnThumbnailCachedInternal(guid, thumb, thumbSize, true);
mImageListView.Refresh();
}
}