public static Surface CreateThumbnail(Surface sourceSurface, GeometryList maskGeometry, RectInt32 maskBounds, int thumbSideLength)
{
Surface dst = new Surface(ThumbnailHelpers.ComputeThumbnailSize(sourceSurface.Size <ColorBgra>(), thumbSideLength));
dst.Clear(ColorBgra.Transparent);
sourceSurface.ResizeFant(dst.Size <ColorBgra>()).Parallelize <ColorBgra>(TilingStrategy.HorizontalSlices, 5, WorkItemQueuePriority.Normal).Render <ColorBgra>(dst);
Surface surface = new Surface(dst.Size <ColorBgra>());
surface.Clear(ColorBgra.Black);
using (PdnGraphicsPath path = new PdnGraphicsPath())
{
path.AddGeometryList(maskGeometry);
double scaleX = (maskBounds.Width == 0) ? 0.0 : (((double)dst.Width) / ((double)maskBounds.Width));
double scaleY = (maskBounds.Height == 0) ? 0.0 : (((double)dst.Height) / ((double)maskBounds.Height));
Matrix3x2Double m = Matrix3x2Double.Translation((double)-maskBounds.X, (double)-maskBounds.Y) * Matrix3x2Double.Scaling(scaleX, scaleY);
using (RenderArgs args = new RenderArgs(surface))
{
args.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
using (Matrix matrix = m.ToGdipMatrix())
{
args.Graphics.Transform = matrix;
}
args.Graphics.FillPath(Brushes.White, (GraphicsPath)path);
args.Graphics.DrawPath(Pens.White, (GraphicsPath)path);
}
}
new IntensityMaskOp().Apply(surface, dst, surface);
RendererBgra.Checkers(dst.Size <ColorBgra>()).Render <ColorBgra>(dst);
CompositionOps.Normal.Static.Apply(dst, dst, surface);
surface.Dispose();
surface = null;
int recommendedExtent = DropShadow.GetRecommendedExtent(dst.Size <ColorBgra>());
ShadowDecorationRenderer renderer = new ShadowDecorationRenderer(dst, recommendedExtent);
Surface surface3 = new Surface(renderer.Size <ColorBgra>());
renderer.Render <ColorBgra>(surface3);
return(surface3);
}