WPF Animated GIF Use Too Much Memory for Displaying Large GIF Image

问题:

I want to display a GIF by using a library WPF Animated GIF. But when the property PictureSource is set, the process memory rises from 208MB to 1GB. Why?

XAML

<Image Name="content" MaxHeight="240" MaxWidth="340"         RenderOptions.BitmapScalingMode="LowQuality"        Width="340" Height="240"        MinWidth="340" MinHeight="240"        gif:ImageBehavior.AutoStart="True"        gif:ImageBehavior.AnimatedSource="{Binding Path=PictureSource}">         <Image.Stretch>             <MultiBinding Converter="{StaticResource ImageStretchConverter}">                 <Binding Path="PictureSource" />                 <Binding ElementName="content" Path="Source.Width" />                 <Binding ElementName="content" Path="Source.Height" />             </MultiBinding>         </Image.Stretch>         <Image.BitmapEffect>             <BlurBitmapEffect Radius="0" />         </Image.BitmapEffect>     <Image.CacheMode>         <BitmapCache EnableClearType="True"                  RenderAtScale="0.2"                  SnapsToDevicePixels="True"/>     </Image.CacheMode>     <!--<Image.Source>         <BitmapImage StreamSource="{Binding Path=PictureSource}" UriSource="{Binding Path=PictureSource}"             DecodePixelWidth="340" DecodePixelHeight="240"/>     </Image.Source>--> </Image> 

ImageStretchConverter

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) {     string path = values[0] as string;     if (string.IsNullOrEmpty(path) || values[1] == DependencyProperty.UnsetValue || values[2] == DependencyProperty.UnsetValue) {         return Stretch.None;     }      if (Path.GetExtension(path).ToLower() == ".gif") {         double width = (double)values[1];         double height = (double)values[2];         if (width > Configuration.MaxThumbnailResolution || height > Configuration.MaxThumbnailResolution) {             return Stretch.UniformToFill;         }     }      return Stretch.None; } 

The size of the original GIF image is quite high. This may cause the problem. How can I set the DecodePixelWidth and DecodePixelHeight of the AnimatedSource?

回答1:

Have you read this article on the problem? https://www.thomaslevesque.com/2015/01/17/a-new-library-to-display-animated-gifs-in-xaml-apps/

The problem is most likely caused by a mistake the developer made when creating the library. You can read all about it in the article, but for a short explanation.

All the frames are pre-rendered in memory, for large gifs this is a big problem. Sadly enough there really isn't a easy fix for that when using the same library without re-programming it.

I'd recommend trying to use XamlAnimatedGif.

https://github.com/thomaslevesque/XamlAnimatedGif

(Which was made by the Same Developer)

文章来源: WPF Animated GIF Use Too Much Memory for Displaying Large GIF Image