protected override Icon Get(IntPtr nativeIcon, CacheIconCallback cacheIcon)
{
var icon = Icon.FromHandle(nativeIcon);
cacheIcon(IconCache, icon.Width, icon);
return(icon);
}
public IconCacheTask(string path, FileAttributes attributes, CacheIconCallback callback)
{
Path = path;
Attributes = attributes;
Callback = callback;
}
private IEnumerable <Image> GetImages(Stream stream, GetCacheIconCallback getCache, CacheIconCallback cacheIcon, out bool dispose)
{
Image source = Image.FromStream(stream);
if (ImageFormat.Gif.Equals(source.RawFormat))
{
// Gif cannot be cached/duplicated/or anything else, really.
// underlying stream must not be closed (learned the hard way).
dispose = false;
cacheIcon(IconCache, source.Width, source);
return(new[] { source });
}
dispose = true;
using (source)
{
if (ImageFormat.Icon.Equals(source.RawFormat))
{
source.Dispose();
stream.Position = 0;
var images = ReadIconStream(stream);
foreach (var item in images)
{
cacheIcon(IconCache, item.Width, item);
}
return(images);
}
else if (ImageFormat.Tiff.Equals(source.RawFormat))
{
List <Image> frames = new();
FrameDimension frameDimension = new(source.FrameDimensionsList[0]);
var pageCount = source.GetFrameCount(FrameDimension.Page);
for (int i = 0; i < pageCount; i++)
{
source.SelectActiveFrame(frameDimension, i);
if (getCache(IconCache, source.Width))
{
continue;
}
Bitmap copy = new(source);
copy.SetResolution(96, 96);
frames.Add(copy);
cacheIcon(IconCache, copy.Width, copy);
}
return(frames);
}
else
{
Bitmap copy = new(source);
copy.SetResolution(96, 96);
cacheIcon(IconCache, copy.Width, copy);
return(new[] { copy });
}
}
}
