/// <summary>
/// 合成GIF传入合成Gif的静态图片信息的集合对象,包括每帧的地址和每帧的播放间隔,
/// 需要指定要用图片信息集合对象里面的Uri还是Stream，默认是Uri
/// animatedRepeat为重复次数默认是循环(1表示只动一次，0：表示循环，n：表示循环n次),
/// 如果成功返回true,失败则返回false.[非后台线程方法，会阻碍前台UI]
/// </summary>
/// <param name="pathList">合成GIF传入合成Gif的静态图片信息的集合对象,包括每帧的地址和每帧的播放间隔</param>
/// <param name="gifDataSource">指定要用图片信息集合对象里面的Uri还是Stream，默认是Uri</param>
/// <param name="animatedRepeat">animatedRepeat为重复次数默认是循环(1表示只动一次，0：表示循环，n：表示循环n次)</param>
/// <param name="fileName">临时文件名，默认为"test.gif"</param>
/// <returns>如果成功返回true,失败则返回false.</returns>
public async static Task <bool> SynthesisGif(List <GifInformation> pathList, GifDataSource gifDataSource = GifDataSource.UriDataSource, int animatedRepeat = 0, string fileName = "test.gif")
{
try
{
if (pathList != null)
{
IRandomAccessStream streamRandom = null;
AnimatedGifEncoder e = new AnimatedGifEncoder();
await e.CreateImageFolder();
//1表示只动一次，0：表示循环，n：表示循环n次
e.SetRepeat(animatedRepeat);
//e.SetTransparent(Colors.Transparent);
e.SetTransparent(Color.FromArgb(0, 0, 0, 0));
for (int i = 0; i < pathList.Count; i++)
{
//图片转换时间
e.SetDelay(pathList[i].DelayMilliseconds);
if (gifDataSource == GifDataSource.UriDataSource)
{
//WriteableBitmap aa = await (new WriteableBitmap(1, 1).FromContent(pathList[i].Uri));
var rass = RandomAccessStreamReference.CreateFromUri(pathList[i].Uri);
streamRandom = await rass.OpenReadAsync();
////System.IO 为扩展命名空间
//WriteableBitmap aa = await (new WriteableBitmap(1, 1).FromStream(streamRandom.GetInputStreamAt(0).AsStreamForRead()));
/*var streamRandomCopy = streamRandom.CloneStream();
*
* WriteableBitmap aa = new WriteableBitmap(1, 1);
* await aa.SetSourceAsync(streamRandom);
* await e.AddFrame(aa, streamRandomCopy);*/
}
else
{
streamRandom = pathList[i].IRandomAccessStream;
}
await e.AddFrame(streamRandom);
}
return(await e.Finish(fileName));
}
else
{
return(false);
}
}
catch (Exception e)
{
Debug.WriteLine(e.Message);
return(false);
}
}
/// <summary>
/// 合成GIF传入合成Gif的静态图片信息的集合对象,包括每帧的地址和每帧的播放间隔,
/// animatedRepeat为重复次数默认是循环(1表示只动一次，0：表示循环，n：表示循环n次),
/// 如果保存成功返回true,保存失败则返回false.[后台线程方法，不会阻碍前台UI]
/// </summary>
/// <param name="pathList">合成GIF传入合成Gif的静态图片信息的集合对象,包括每帧的地址和每帧的播放间隔</param>
/// <param name="gifDataSource">指定要用图片信息集合对象里面的Uri还是Stream，默认是Uri</param>
/// <param name="animatedRepeat">animatedRepeat为重复次数默认是循环(1表示只动一次，0：表示循环，n：表示循环n次)</param>
/// <param name="fileName">临时文件名，默认为"test.gif"</param>
/// <returns>如果保存成功返回true,保存失败则返回false.</returns>
public async static Task <bool> SaveSynthesisGif(List <GifInformation> pathList, GifDataSource gifDataSource = GifDataSource.UriDataSource, int animatedRepeat = 0, string fileName = "test.gif")
{
bool ok = false;
await Task.Run(async() =>
{
if ((await SynthesisGif(pathList, gifDataSource, animatedRepeat, fileName)))
{
//进行保存
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal, async() =>
{
try
{
StorageFolder storageFolder = await ControlLibrary.CacheManagement.CacheManagement.Instance.GetImageFolder();
StorageFile storageFile = await storageFolder.GetFileAsync(fileName);
if (storageFile != null)
{
FileSavePicker savePicker = new FileSavePicker();
savePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
savePicker.FileTypeChoices.Add("图片类型", new List <string>()
{
".gif"
});
savePicker.SuggestedFileName = storageFile.Name;
StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
CachedFileManager.DeferUpdates(file);
await storageFile.CopyAndReplaceAsync(file); //, file.Name, NameCollisionOption.GenerateUniqueName);
FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
if (status == FileUpdateStatus.Complete)
{
ok = true;
}
}
}
}
catch
{
ok = false;
}
});
}
});
return(ok);
}
