done new image viewer

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/NativeImageProvider.cs

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+// Copyright © 2018 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.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Media.Imaging;
+using QuickLook.Common.Helpers;
+
+namespace QuickLook.Plugin.ImageViewer.AnimatedImage
+{
+    internal class NativeImageProvider : AnimationProvider
+    {
+        public NativeImageProvider(string path, NConvert meta) : base(path, meta)
+        {
+            Animator = new Int32AnimationUsingKeyFrames();
+            Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(0,
+                KeyTime.FromTimeSpan(TimeSpan.Zero)));
+        }
+
+        public override Task<BitmapSource> GetThumbnail(Size size, Size fullSize)
+        {
+            var decodeWidth = Math.Round(fullSize.Width *
+                                         Math.Min(size.Width / 2 / fullSize.Width, size.Height / 2 / fullSize.Height));
+            var scale = fullSize.Width / decodeWidth;
+            var decodeHeight = Math.Round(fullSize.Height / scale);
+
+            return new Task<BitmapSource>(() =>
+            {
+                try
+                {
+                    var img = new BitmapImage();
+                    img.BeginInit();
+                    img.UriSource = new Uri(Path);
+                    img.CacheOption = BitmapCacheOption.OnLoad;
+                    img.DecodePixelWidth = (int) decodeWidth;
+                    img.DecodePixelHeight =
+                        (int) decodeHeight; // specific size to avoid .net's double to int conversion
+                    img.EndInit();
+
+                    var scaled = new TransformedBitmap(img, new ScaleTransform(scale, scale));
+                    scaled.Freeze();
+                    return scaled;
+                }
+                catch (Exception e)
+                {
+                    ProcessHelper.WriteLog(e.ToString());
+                    return null;
+                }
+            });
+        }
+
+        public override Task<BitmapSource> GetRenderedFrame(int index)
+        {
+            return new Task<BitmapSource>(() =>
+            {
+                try
+                {
+                    var img = new BitmapImage();
+                    img.BeginInit();
+                    img.UriSource = new Uri(Path);
+                    img.CacheOption = BitmapCacheOption.OnLoad;
+                    img.EndInit();
+
+                    img.Freeze();
+                    return img;
+                }
+                catch (Exception e)
+                {
+                    ProcessHelper.WriteLog(e.ToString());
+                    return null;
+                }
+            });
+        }
+
+        public override void Dispose()
+        {
+        }
+    }
+}