private IRenderer <ColorAlpha8> CreateMaskRenderer()
{
IRenderer <ColorAlpha8> renderer;
byte x = (byte)Math.Round((double)(this.changes.Tolerance * 255.0), MidpointRounding.AwayFromZero);
byte tolerance = ByteUtil.FastScale(x, x);
PointInt32 pt = this.changes.OriginPointInt32;
if (!this.sampleSource.Bounds <ColorBgra>().Contains(pt))
{
return(new FillRendererAlpha8(this.sampleSource.Width, this.sampleSource.Height, ColorAlpha8.Transparent));
}
ColorBgra pointSlow = this.sampleSource.GetPointSlow(pt);
base.ThrowIfCancellationRequested();
if (this.changes.FloodMode == FloodMode.Global)
{
renderer = new FillStencilByColorRenderer(this.sampleSource, pointSlow, tolerance, this);
}
else
{
RectInt32 num5;
BitVector2D source = new BitVector2D(this.sampleSource.Width, this.sampleSource.Height);
BitVector2DStruct stencilBuffer = new BitVector2DStruct(source);
source.Clear(true);
base.ThrowIfCancellationRequested();
foreach (RectInt32 num6 in this.changes.ClippingMask.EnumerateInteriorScans())
{
source.Set(num6, false);
base.ThrowIfCancellationRequested();
}
BitVector2D other = source.Clone();
base.ThrowIfCancellationRequested();
FloodFillAlgorithm.FillStencilFromPoint <BitVector2DStruct>(this.sampleSource, stencilBuffer, pt, tolerance, this, out num5);
base.ThrowIfCancellationRequested();
source.Xor(other);
base.ThrowIfCancellationRequested();
renderer = new BitVector2DToAlpha8Renderer <BitVector2DStruct>(stencilBuffer);
}
if (this.changes.Antialiasing)
{
return(new FeatheredMaskRenderer(this.sampleSource, pointSlow, renderer, tolerance, this));
}
return(renderer);
}
