minor image colour tweaking

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/Providers/GifProvider.cs

@@ -0,0 +1,89 @@
+// 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.Drawing;
+using System.Threading.Tasks;
+using System.Windows.Media.Animation;
+using System.Windows.Media.Imaging;
+using QuickLook.Common.ExtensionMethods;
+using QuickLook.Common.Helpers;
+using Size = System.Windows.Size;
+
+namespace QuickLook.Plugin.ImageViewer.AnimatedImage.Providers
+{
+    internal class GifProvider : AnimationProvider
+    {
+        private Bitmap _fileHandle;
+        private BitmapSource _frame;
+        private bool _isPlaying;
+
+        public GifProvider(string path, MetaProvider meta) : base(path, meta)
+        {
+            _fileHandle = (Bitmap) Image.FromFile(path);
+
+            _fileHandle.SetResolution(DpiHelper.DefaultDpi * DpiHelper.GetCurrentScaleFactor().Horizontal,
+                DpiHelper.DefaultDpi * DpiHelper.GetCurrentScaleFactor().Vertical);
+
+            Animator = new Int32AnimationUsingKeyFrames {RepeatBehavior = RepeatBehavior.Forever};
+            Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(0, KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(0))));
+            Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(1, KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(10))));
+            Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(2, KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(20))));
+        }
+
+        public override void Dispose()
+        {
+            if (_fileHandle == null)
+                return;
+
+            ImageAnimator.StopAnimate(_fileHandle, OnFrameChanged);
+            _fileHandle.Dispose();
+
+            _fileHandle = null;
+            _frame = null;
+        }
+
+        public override Task<BitmapSource> GetThumbnail(Size renderSize)
+        {
+            return new Task<BitmapSource>(() =>
+            {
+                _frame = _fileHandle.ToBitmapSource();
+                return _frame;
+            });
+        }
+
+        public override Task<BitmapSource> GetRenderedFrame(int index)
+        {
+            return new Task<BitmapSource>(() =>
+            {
+                if (!_isPlaying)
+                {
+                    _isPlaying = true;
+                    ImageAnimator.Animate(_fileHandle, OnFrameChanged);
+                }
+
+                return _frame;
+            });
+        }
+
+        private void OnFrameChanged(object sender, EventArgs e)
+        {
+            ImageAnimator.UpdateFrames();
+            _frame = _fileHandle.ToBitmapSource();
+        }
+    }
+}