为什么GifBitmapDecoder播放不完整的gif [英] Why GifBitmapDecoder play incomplete gif

问题描述

我想使用GifBitmapDecoder和Int32Animation播放gif图像，但是我发现某些gif播放时不完整.

I want to play a gif image using GifBitmapDecoder and Int32Animation, but I found some gif is incomplete when they were played.

这是我的gif:

这是我的测试代码:

GifBitmapDecoder _gifDecoder = new GifBitmapDecoder(
            new Uri("pack://application:,,,/Expression/f006.gif"), 
            BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);

foreach (BitmapFrame bf in _gifDecoder.Frames)
{
     Image i = new Image { Source = bf };
     wp.Children.Add(i);
}

Xaml:

<WrapPanel Name="wp" ItemHeight="40" ItemWidth="40"/>

结果:

所以你能告诉我怎么了，因为我已经搜索了两天却什么也没找到...

So could you tell me what's wrong, since I have search for it two days and find nothing...

推荐答案

单个GIF帧可能只是图像在任意X，Y坐标处的一部分.

Individual GIF frames might be just portions of an image at any arbitrary X,Y-coordinate.

要在图像中正确放置框架，您将需要框架的X，Y坐标. 阅读有关如何获取此信息的文章:正在读取GifBitmapDecoder的Metadata属性...为什么它为null?

For properly placing a frame in the image, you will need the X,Y-coordinate of the frame. Read this post about how to get this information: Reading Metadata property of GifBitmapDecoder...why is it null?

然后要获得完整的图像，必须将框架与之前的框架合并，直到获得完整的图像.但是，假设您真正的"GIF播放器"只是将动画帧一个接一个地绘制(而不是将它们并排放置在StackPanel中)，这将自动发生……

Then to get a complete image you must merge the frame with the previous frame(s), until a complete image is being obtained. However, assuming that your real "GIF player" just draws the animation frames one on top of another (instead of putting them side-by-side in a StackPanel), this would happen automagically...

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