protected Gdk.Pixbuf TransformAndDispose(Gdk.Pixbuf orig)
{
if (orig == null)
{
return(null);
}
Gdk.Pixbuf rotated = orig.TransformOrientation(Orientation);
orig.Dispose();
return(rotated);
}
public static void GenerateMipMap (IPhoto photo)
{
var mipmap_uri = MipMapUri (photo);
Log.DebugFormat ("Generating mipmap for {0} - {1}", photo.Uri.ToString (), mipmap_uri.AbsoluteUri);
var file = GLib.FileFactory.NewForUri (photo.Uri);
var pixbuf = new Gdk.Pixbuf (new GLib.GioStream (file.Read (null)));
var imagefile = TagLib.File.Create (new GIOTagLibFileAbstraction () { Uri = photo.Uri }) as TagLib.Image.File;
var tag = imagefile.ImageTag;
// Correct orientation
pixbuf = pixbuf.TransformOrientation (tag.Orientation);
// Determine mode
var mode = pixbuf.Width > pixbuf.Height ? ScaleMode.Width : ScaleMode.Height;
var longest = mode == ScaleMode.Width ? pixbuf.Width : pixbuf.Height;
double scale_factor = Math.Max ((double) longest / 1600, 1.0);
MipMapFile map = new MipMapFile ();
List<Gdk.Pixbuf> pixbufs = new List<Gdk.Pixbuf>(7); // Six or seven on average
if (scale_factor > 1.0) {
using (var tmp = pixbuf)
pixbuf = pixbuf.ScaleSimple ((int) Math.Round (pixbuf.Width / scale_factor), (int) Math.Round (pixbuf.Height / scale_factor), Gdk.InterpType.Bilinear);
}
int max;
do {
max = Math.Max (pixbuf.Width, pixbuf.Height);
pixbufs.Add (pixbuf);
pixbuf = pixbuf.ScaleSimple (pixbuf.Width / 2, pixbuf.Height / 2, Gdk.InterpType.Bilinear);
} while (max > 64);
pixbuf.Dispose ();
// As the mipmap items are built from largest -> smallest, we need to add them in reverse.
pixbufs.Reverse ();
foreach (var buf in pixbufs) {
map.Add (buf);
}
map.WriteToUri (mipmap_uri);
}
