Using WIC to Quickly Create Scaled Down Bitmap that honors EXIF Orientation Tag

问题

I'm looking for the fastest way to create scaled down bitmap that honors EXIF orientation tag

Ref :https://weblogs.asp.net/bleroy/the-fastest-way-to-resize-images-from-asp-net-and-it-s-more-supported-ish

Currently i use the following code to create a Bitmap that honors EXIF Orientation tag

  static Bitmap FixImageOrientation(Bitmap srce)
        {
            const int ExifOrientationId = 0x112;
            // Read orientation tag
            if (!srce.PropertyIdList.Contains(ExifOrientationId)) return srce;
            var prop = srce.GetPropertyItem(ExifOrientationId);
            var orient = BitConverter.ToInt16(prop.Value, 0);
            // Force value to 1
            prop.Value = BitConverter.GetBytes((short)1);
            srce.SetPropertyItem(prop);

            // Rotate/flip image according to <orient>
            switch (orient)
            {
                case 1:
                    srce.RotateFlip(RotateFlipType.RotateNoneFlipNone);
                    return srce;


                case 2:
                    srce.RotateFlip(RotateFlipType.RotateNoneFlipX);
                    return srce;

                case 3:
                    srce.RotateFlip(RotateFlipType.Rotate180FlipNone);
                    return srce;

                case 4:
                    srce.RotateFlip(RotateFlipType.Rotate180FlipX);
                    return srce;

                case 5:
                    srce.RotateFlip(RotateFlipType.Rotate90FlipX);
                    return srce;

                case 6:
                    srce.RotateFlip(RotateFlipType.Rotate90FlipNone);
                    return srce;

                case 7:
                    srce.RotateFlip(RotateFlipType.Rotate270FlipX);
                    return srce;

                case 8:
                    srce.RotateFlip(RotateFlipType.Rotate270FlipNone);
                    return srce;

                default:
                    srce.RotateFlip(RotateFlipType.RotateNoneFlipNone);
                    return srce;
            }
        }

I'm first creating a orientation fixed image ,then resizing it (preserving aspect ratio) for fast processing.

  public static Bitmap UpdatedResizeImage(Bitmap source, Size size)
        {
            var scale = Math.Min(size.Width / (double)source.Width, size.Height / (double)source.Height);
            var bmp = new Bitmap((int)(source.Width * scale), (int)(source.Height * scale));

            using (var graph = Graphics.FromImage(bmp))
            {
                graph.InterpolationMode = InterpolationMode.High;
                graph.CompositingQuality = CompositingQuality.HighQuality;
                graph.SmoothingMode = SmoothingMode.AntiAlias;
                graph.DrawImage(source, 0, 0, bmp.Width, bmp.Height);
            }
            return bmp;
        }

Now WIC allows much faster image manipulation.Ref:https://stackoverflow.com/a/57987315/848968

How can i create a Scaled Down BitmapImage that honours the EXIF tag

来源：https://stackoverflow.com/questions/58061904/using-wic-to-quickly-create-scaled-down-bitmap-that-honors-exif-orientation-tag