private static void makeFullImage(Photo.Metadata metadata, BitmapImage img)
{
if (DownsampleFullImage && (
metadata.Width > SystemParameters.MaximizedPrimaryScreenWidth ||
metadata.Height > SystemParameters.MaximizedPrimaryScreenHeight))
{
if (metadata.Width * SystemParameters.MaximizedPrimaryScreenHeight >
metadata.Height * SystemParameters.MaximizedPrimaryScreenWidth)
{
img.DecodePixelWidth = (int)SystemParameters.MaximizedPrimaryScreenWidth;
}
else
{
img.DecodePixelHeight = (int)SystemParameters.MaximizedPrimaryScreenHeight;
}
}
img.CacheOption = BitmapCacheOption.None;
img.Rotation = Exif.OrienationToRotation(metadata.Orientation);
img.EndInit();
img.Freeze();
}
private async Task loadMeta(Photo photo,
ObservableCollection <Photo> list)
{
try {
if (photo.Disposed)
{
return;
}
var mmap = MemoryMappedFile.CreateFromFile(
File.Open(photo.FileName,
FileMode.Open,
FileAccess.Read,
FileShare.Delete | FileShare.Read),
mmapName(photo.FileName),
0,
MemoryMappedFileAccess.Read,
HandleInheritability.None,
false);
var img = new BitmapImage();
Photo.Metadata metadata;
DispatcherOperation metaSet;
try {
using (var stream = new UnsafeMemoryMapStream(
mmap.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read),
FileAccess.Read)) {
var data = stream.Stream;
{
var decoder = BitmapDecoder.Create(data,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.None);
var frames = decoder.Frames;
if (frames.Count < 1)
{
throw new ArgumentException("Image contained no frame data.", nameof(photo));
}
if (!(frames[0].Metadata is BitmapMetadata imgMeta))
{
throw new NullReferenceException("Image contained no metadata");
}
metadata = Exif.GetMetadata(imgMeta);
metadata.Width = frames[0].PixelWidth;
metadata.Height = frames[0].PixelHeight;
}
data.Seek(0, SeekOrigin.Begin);
metaSet = photo.Dispatcher.InvokeAsync(() => photo.Set(metadata));
img.BeginInit();
img.StreamSource = data;
if (3 * metadata.Width > 2 * metadata.Height)
{
img.DecodePixelWidth = 3 * ThumbnailHeight / 2;
}
else
{
img.DecodePixelHeight = ThumbnailHeight;
}
img.CacheOption = BitmapCacheOption.OnLoad;
img.Rotation = Exif.OrienationToRotation(metadata.Orientation);
img.EndInit();
img.Freeze();
}
await metaSet;
} catch {
mmap.Dispose();
throw;
}
if (!await photo.Dispatcher.InvokeAsync(() => {
if (photo.Disposed)
{
return(false);
}
photo.mmap = mmap;
photo.loader = this;
photo.ThumbImage = img;
return(true);
}))
{
mmap.Dispose();
}
} catch (Exception ex) {
await photo.Dispatcher.InvokeAsync(() => {
MessageBox.Show(ex.ToString(),
string.Format("Error loading {0}\n\n{1}",
photo.FileName, ex),
MessageBoxButton.OK,
MessageBoxImage.Error);
photo.Dispose();
list.Remove(photo);
});
}
}