private static async Task <Photo.Metadata> reloadAndSave(
Photo photo, bool forceJpeg, string destFile)
{
using (var mmap = MemoryMappedFile.OpenExisting(
mmapName(photo.FileName),
MemoryMappedFileRights.Read)) {
using (var stream = new UnsafeMemoryMapStream(
mmap.CreateViewAccessor(0, 0, MemoryMappedFileAccess.Read),
FileAccess.Read)) {
(var sourceFrame, var format) = loadFrame(stream.Stream);
var md = sourceFrame.Metadata.Clone() as BitmapMetadata;
Photo.Metadata newMetadata = await Exif.SetMetadata(photo, md);
newMetadata.Width = sourceFrame.PixelWidth;
newMetadata.Height = sourceFrame.PixelHeight;
BitmapEncoder encoder = forceJpeg ?
new JpegBitmapEncoder() :
BitmapEncoder.Create(format);
encoder.Frames.Add(
BitmapFrame.Create(
sourceFrame,
null,
md,
sourceFrame.ColorContexts));
if (encoder is JpegBitmapEncoder jpg)
{
jpg.Rotation = Exif.SaveRotation(md);
}
sourceFrame = null;
using (var outFile = new FileStream(destFile, FileMode.CreateNew)) {
encoder.Save(outFile);
}
return(newMetadata);
}
}
}
