protected override GeometryList CreateSelectionGeometry(MagicWandToolChanges changes, AsyncSelectionToolCreateGeometryContext context, CancellationToken cancellationToken)
{
GeometryList list;
Result <BitVector2D> lazyBaseStencil;
IRenderer <ColorBgra> sampleSource = ((MagicWandToolCreateGeometryContext)context).SampleSource;
byte x = (byte)Math.Round((double)(changes.Tolerance * 255.0), MidpointRounding.AwayFromZero);
byte tolerance = ByteUtil.FastScale(x, x);
PointInt32 pt = changes.OriginPointInt32;
if (!sampleSource.Bounds <ColorBgra>().Contains(pt))
{
switch (changes.SelectionCombineMode)
{
case SelectionCombineMode.Replace:
case SelectionCombineMode.Intersect:
return(new GeometryList());
case SelectionCombineMode.Union:
case SelectionCombineMode.Exclude:
case SelectionCombineMode.Xor:
return(changes.BaseGeometry);
}
throw ExceptionUtil.InvalidEnumArgumentException <SelectionCombineMode>(changes.SelectionCombineMode, "changes.SelectionCombineMode");
}
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
Func <bool> isCancellationRequestedFn = () => cancellationToken.IsCancellationRequested;
ColorBgra basis = sampleSource.GetPointSlow(pt);
int width = ((sampleSource.Width + 0x1f) / 0x20) * 0x20;
BitVector2D newStencil = new BitVector2D(width, sampleSource.Height);
BitVector2DStruct newStencilWrapper = new BitVector2DStruct(newStencil);
if (((changes.SelectionCombineMode != SelectionCombineMode.Replace) && sampleSource.Bounds <ColorBgra>().Contains(changes.BaseGeometry.Bounds.Int32Bound)) && changes.BaseGeometry.IsPixelated)
{
lazyBaseStencil = LazyResult.New <BitVector2D>(() => PixelatedGeometryListToBitVector2D(changes.BaseGeometry, newStencil.Width, newStencil.Height, cancellationToken), LazyThreadSafetyMode.ExecutionAndPublication, new SingleUseCriticalSection());
ThreadPool.QueueUserWorkItem(delegate(object _) {
lazyBaseStencil.EnsureEvaluated();
});
}
else
{
lazyBaseStencil = null;
}
FloodMode floodMode = changes.FloodMode;
if (floodMode != FloodMode.Local)
{
if (floodMode != FloodMode.Global)
{
throw ExceptionUtil.InvalidEnumArgumentException <FloodMode>(changes.FloodMode, "changes.FloodMode");
}
}
else
{
RectInt32 num4;
FloodFillAlgorithm.FillStencilFromPoint <BitVector2DStruct>(sampleSource, newStencilWrapper, pt, tolerance, isCancellationRequestedFn, out num4);
goto Label_0293;
}
TileMathHelper tileMathHelper = new TileMathHelper(sampleSource.Width, sampleSource.Height, 7);
Work.ParallelForEach <PointInt32>(WaitType.Pumping, tileMathHelper.EnumerateTileOffsets(), delegate(PointInt32 tileOffset) {
if (!cancellationToken.IsCancellationRequested)
{
RectInt32 clipRect = tileMathHelper.GetTileSourceRect(tileOffset);
FloodFillAlgorithm.FillStencilByColor <BitVector2DStruct>(sampleSource, newStencilWrapper, basis, tolerance, isCancellationRequestedFn, clipRect);
}
}, WorkItemQueuePriority.Normal, null);
Label_0293:
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
if (changes.SelectionCombineMode == SelectionCombineMode.Replace)
{
list = GeometryList.FromStencil <BitVector2DStruct>(newStencilWrapper, cancellationToken);
}
else if (lazyBaseStencil == null)
{
GeometryList rhs = GeometryList.FromStencil <BitVector2DStruct>(newStencilWrapper, cancellationToken);
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
list = GeometryList.Combine(changes.BaseGeometry, changes.SelectionCombineMode.ToGeometryCombineMode(), rhs);
}
else
{
BitVector2D other = lazyBaseStencil.Value;
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
switch (changes.SelectionCombineMode)
{
case SelectionCombineMode.Replace:
throw new InternalErrorException();
case SelectionCombineMode.Union:
newStencil.Or(other);
break;
case SelectionCombineMode.Exclude:
newStencil.Invert();
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
newStencil.And(other);
break;
case SelectionCombineMode.Intersect:
newStencil.And(other);
break;
case SelectionCombineMode.Xor:
newStencil.Xor(other);
break;
default:
throw ExceptionUtil.InvalidEnumArgumentException <SelectionCombineMode>(changes.SelectionCombineMode, "changes.SelectionCombineMode");
}
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
list = GeometryList.FromStencil <BitVector2DStruct>(newStencilWrapper, cancellationToken);
}
if (cancellationToken.IsCancellationRequested)
{
return(null);
}
list.Freeze();
return(list);
}