public static async Task <string> GenerateImageFractalFan(
[ActivityTrigger]
FractalInput input,
[SignalR(HubName = "carlintveld")] IAsyncCollector <SignalRMessage> signalRMessages,
ILogger log)
{
if (signalRMessages != null)
{
await signalRMessages.AddAsync(new SignalRMessage
{
Target = "FanoutEvent",
Arguments = new object[] { "started", input.imageIndex, $"{input.instance}/{input.name}" }
});
await signalRMessages.FlushAsync();
}
SKData data = CreateFractalImageData(input);
await CreateBlob($"{input.instance}/{input.name}.png", data);
if (signalRMessages != null)
{
await signalRMessages.AddAsync(new SignalRMessage
{
Target = "FanoutEvent",
Arguments = new object[] { "finished", input.imageIndex, $"{input.instance}/{input.name}" }
});
await signalRMessages.FlushAsync();
}
return($"Finished - {input.name}");
}
public static string GetSequenceNumber([ActivityTrigger] FractalInput input, ILogger log)
{
string connectionString = System.Environment.GetEnvironmentVariable("AzureStorageConnectionString", EnvironmentVariableTarget.Process);
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
var client = storageAccount.CreateCloudTableClient();
var table = client.GetTableReference("Sequence");
table.CreateIfNotExistsAsync();
// var t = new TableEntity()
var op = TableOperation.Insert(null);
return("1");
}
private static SKData CreateFractalImageData(FractalInput input)
{
FractalInit initdata = InitData(0, 0, input.zoom);
// Create a surface.
var info = new SKImageInfo(initdata.width, initdata.height, SKImageInfo.PlatformColorType, SKAlphaType.Unpremul);
//using (var surface = SKSurface.Create(info))
{
var mandelbrot = new FractalMandelbrot(initdata);
var bytes = mandelbrot.compute();
// the the canvas and properties
//var canvas = surface.Canvas;
//for (int y = 0; y < initdata.height; y++)
//{
// for (int x = 0; x < initdata.width; x++)
// {
// int index = 4 * (x + y * initdata.width);
// canvas.DrawPoint(new SKPoint(x, y), new SKColor(bytes[index + 2], bytes[index + 1], bytes[index]));
// }
//}
// Optimization taken from https://github.com/mono/SkiaSharp/issues/416
// create an empty bitmap
var bitmap = new SKBitmap();
// pin the managed array so that the GC doesn't move it
var gcHandle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
// install the pixels with the color type of the pixel data
bitmap.InstallPixels(info, gcHandle.AddrOfPinnedObject(), info.RowBytes, delegate { gcHandle.Free(); }, null);
//using (var image = surface.Snapshot())
using (var image = SKImage.FromBitmap(bitmap))
{
SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
return(data);
}
}
}
