public IAsyncInfo GenerateGif(StorageFile outputFile, int delay, bool repeat, List <byte[]> sourceBytes)
{
return(AsyncInfo.Run(async ctx =>
{
var outStream = await outputFile.OpenAsync(FileAccessMode.ReadWrite);
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.GifEncoderId, outStream);
if (repeat) // set repeat property
{
var containerProperties = new BitmapPropertySet
{
{ "/appext/Application", new BitmapTypedValue(Encoding.UTF8.GetBytes("NETSCAPE2.0"), PropertyType.UInt8Array) },
{ "/appext/Data", new BitmapTypedValue(new byte[] { 3, 1, 0, 0, 0 }, PropertyType.UInt8Array) },
};
await encoder.BitmapContainerProperties.SetPropertiesAsync(containerProperties);
}
try
{
for (int i = 0; i < sourceBytes.Count; i++)
{
using (MemoryRandomAccessStream frameStream = new MemoryRandomAccessStream(sourceBytes[i]))
{
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(frameStream);
PixelDataProvider pixels = await decoder.GetPixelDataAsync();
encoder.SetPixelData(decoder.BitmapPixelFormat, BitmapAlphaMode.Ignore,
decoder.OrientedPixelWidth, decoder.OrientedPixelHeight,
decoder.DpiX, decoder.DpiY,
pixels.DetachPixelData());
if (i == 0)
{
var properties = new BitmapPropertySet {
{ "/grctlext/Delay", new BitmapTypedValue(delay / 10, PropertyType.UInt16) }
};
await encoder.BitmapProperties.SetPropertiesAsync(properties);
}
if (i < sourceBytes.Count - 1)
{
await encoder.GoToNextFrameAsync();
}
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("exception caught: " + ex.ToString());
// throw ex;
}
await encoder.FlushAsync();
outStream.Dispose();
}));
}
private static async Task EncodeImageAsync(ushort delayTime, BitmapEncoder encoder, ZipArchiveEntry entry)
{
using (var imageStream = entry.Open())
{
using (var pixelStream = new MemoryStream())
{
await imageStream.CopyToAsync(pixelStream);
pixelStream.Seek(0, SeekOrigin.Begin);
var decoder = await BitmapDecoder.CreateAsync(pixelStream.AsRandomAccessStream());
var pixels = await decoder.GetPixelDataAsync();
encoder.SetPixelData(
decoder.BitmapPixelFormat,
BitmapAlphaMode.Ignore,
decoder.PixelWidth,
decoder.PixelHeight,
decoder.DpiX,
decoder.DpiY,
pixels.DetachPixelData());
var properties = new BitmapPropertySet
{
{
"/grctlext/Delay",
new BitmapTypedValue(delayTime / 10, PropertyType.UInt16)
}
};
await encoder.BitmapProperties.SetPropertiesAsync(properties);
await encoder.GoToNextFrameAsync();
}
}
}
