private void UpdateTileWhileLocked(TileData tileData, ICancellationToken cancelToken)
{
RectInt32 tileSourceRect = this.tileMathHelper.GetTileSourceRect(tileData.Offset);
RectDouble num2 = tileSourceRect;
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
object newCurrencyToken = this.renderData.CreateCurrencyToken();
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
IList <int?> list = this.renderData.GetStrokeSampleIndicesInRect(tileSourceRect, tileData.CurrencyToken, newCurrencyToken);
int count = list.Count;
if (count > 0)
{
SizeDouble size = this.stamp.Size;
RectDouble num5 = new RectDouble(PointDouble.Zero, size);
IDrawingContext dc = null;
try
{
for (int i = 0; i < count; i++)
{
int?nullable = list[i];
if (nullable.HasValue)
{
if (tileData.Mask == null)
{
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
tileData.Mask = new SurfaceAlpha8(tileSourceRect.Size);
}
if (tileData.MaskRenderTarget == null)
{
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
tileData.MaskRenderTarget = RenderTarget.FromSurface(tileData.Mask, FactorySource.PerThread);
}
if (dc == null)
{
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
dc = DrawingContext.FromRenderTarget(tileData.MaskRenderTarget);
dc.UseTranslateTransform((float)-tileSourceRect.X, (float)-tileSourceRect.Y, MatrixMultiplyOrder.Prepend);
dc.AntialiasMode = AntialiasMode.Aliased;
}
int valueOrDefault = nullable.GetValueOrDefault();
RectDouble bounds = this.renderData.StrokeSamples[valueOrDefault].GetBounds(size);
RectDouble num9 = this.stamp.Antialiased ? bounds : RectDouble.Round(bounds, MidpointRounding.AwayFromZero);
cancelToken.ThrowIfCancellationRequested <ICancellationToken>();
RectDouble?srcRect = null;
dc.FillOpacityMask(this.lazyStampMaskDevBitmap.CancelableValue <DeviceBitmap>(), whiteBrush, OpacityMaskContent.Graphics, new RectDouble?(num9), srcRect);
}
}
}
finally
{
DisposableUtil.Free <IDrawingContext>(ref dc);
}
}
tileData.CurrencyToken = newCurrencyToken;
}
