QuickLook/QuickLook.Plugin/QuickLook.Plugin.ImageViewer/ImageFileHelper.cs

// Copyright © 2017 Paddy Xu
// 
// This file is part of QuickLook program.
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Windows;
using ExifLib;
using ImageMagick;

namespace QuickLook.Plugin.ImageViewer
{
    internal static class ImageFileHelper
    {
        internal static Size? GetImageSize(string path)
        {
            var ori = GetOrientationFromExif(path);

            try
            {
                var info = new MagickImageInfo(path);

                if (ori == OrientationType.RightTop || ori == OrientationType.LeftBotom)
                    return new Size {Width = info.Height, Height = info.Width};
                return new Size {Width = info.Width, Height = info.Height};
            }
            catch (MagickException)
            {
                return null;
            }
        }

        private static OrientationType GetOrientationFromExif(string path)
        {
            try
            {
                using (var re = new ExifReader(path))
                {
                    re.GetTagValue(ExifTags.Orientation, out ushort orientation);

                    if (orientation == 0)
                        return OrientationType.Undefined;

                    return (OrientationType) orientation;
                }
            }
            catch (Exception)
            {
                return OrientationType.Undefined;
            }
        }
    }
}