使用 BitmapEncoder 生成时如何使 GIF 循环重复 [英] How do I make a GIF repeat in loop when generating with BitmapEncoder

问题描述

我能够使用 BitmapEncoder(C#、WinRT)来创建动画 gif.但是，我一直无法弄清楚如何使 GIF 循环返回并从头开始?

I am able to use BitmapEncoder (C#, WinRT) to create an animated gif. However, I haven't been able to figure out how to make the GIF loop back and start from scratch?

没有尝试太多，因为我不知道该尝试什么.搜索了更多要在 GIF 上设置的属性，但找不到任何相关内容.

Didn't try much because I am not sure what to try. Searched for more properties to set on the GIF, but could not find anything relative.

推荐答案

好吧，终于搞清楚了.显然，您需要将以下元数据添加到 GIF 以使其循环:

Okay, finally been able to figure it out. Apparently you need to add the following metdata to the GIF to get it to loop:

BitmapPropertySet properties = await encoder.BitmapProperties.GetPropertiesAsync("/appext/Data");
properties = new BitmapPropertySet()
{
    {
        "/appext/Application",
        new BitmapTypedValue(Iso8859.Default.GetBytes("NETSCAPE2.0"), Windows.Foundation.PropertyType.UInt8Array)
    },
    { 
        "/appext/Data",
        new BitmapTypedValue(new byte[] { 3, 1, 0, 0, 0 }, Windows.Foundation.PropertyType.UInt8Array)
    },
};

await encoder.BitmapProperties.SetPropertiesAsync(properties);

如果您的项目中没有 Iso8859，只需将NETSCAPE2.0"的 ascii 代码作为字节数组放入其中.

If you don't have an Iso8859 in your project, simply place the ascii code for "NETSCAPE2.0" as a byte array in there.

这篇关于使用 BitmapEncoder 生成时如何使 GIF 循环重复的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！