protected async Task <List <Rectangle> > _findSubimagesMultithreaded(DirectBitmap small, byte margin, ImageSearchingOptions opts)
{
var xy = MathHelper.CalculateTableForGrids(opts.Threads);
var rects = this.Area.Split(xy.X, xy.Y).ToArray();
var token = new cancelToken();
DataflowNotifier <List <Rectangle> > df = null;
AsyncManualResetEvent res = new AsyncManualResetEvent(false);
if (opts.NumberOfResults > 0) //limit search!
{
df = new DataflowNotifier <List <Rectangle> >(r => {
var @out = !(df.Collection.Count >= opts.NumberOfResults);
if (@out == false) //has reached limit
{
token.Cancel();
res.Set();
}
return(@out);
}, true);
}
else
{
df = new DataflowNotifier <List <Rectangle> >(true);
}
Debugging.Restart();
//Debugging.Print("Ready to fire");
int i = 0;
Task[] tasks = opts.IgnoreAlphaPixels && small.Map != null
? rects.Select(r => Pool.Run(() => _findImageAlpha(small, r, small.Map.Ranges, margin, token, opts)).AndThen(t => df.Set(t))).ToArray()
: rects.Select(r => Pool.Run(() => _findImage(small, r, margin, token, opts)).AndThen(t => df.Set(t))).ToArray();
await Task.WhenAny(Task.WhenAll(tasks), res.WaitAsync());
//Debugging.Print("Has Ended");
return(df.Collection.ToArray().SelectMany(l => l).ToList());
}
