//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using GrapeCity.Documents.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;
namespace DsImagingWeb.Demos{    // This sample takes a color JPEG, and creates bi-level bitmaps from it    // using all available dithering methods. The resulting b/w images    // are added as frames to a multi-frame TIFF.    // The original color image is added as the last page.    public class DitheringInTiff    {        public string DefaultMime { get => Common.Util.MimeTypes.TIFF; }
        public Stream GenerateImageStream(string targetMime, Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            if (targetMime != Common.Util.MimeTypes.TIFF)                throw new Exception("This sample only supports TIFF output format.");
            var path = Path.Combine("Resources", "Images", "minerva.jpg");            var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));            var ms = new MemoryStream();            using (var tw = new GcTiffWriter(ms))            using (var bmp = new GcBitmap(path))            {                // Create text layout for labels:                var tl = new TextLayout(bmp.DpiX);                tl.DefaultFormat.Font = font;                tl.DefaultFormat.FontSize = 16;                tl.DefaultFormat.BackColor = Color.White;                // Loop through all dithering methods (starting with no dithering):                var methods = typeof(DitheringMethod).GetEnumValues();                foreach (DitheringMethod method in methods)                {                    using (var tbmp = bmp.Clone())                    {                        // Apply dithering:                        tbmp.ApplyEffect(DitheringEffect.Get(method));                        // Draw label:                        tl.Clear();                        tl.Append(method.ToString());                        tl.PerformLayout(true);                        using (var g = tbmp.CreateGraphics())                            g.DrawTextLayout(tl, new PointF(0, tbmp.Height - tl.ContentHeight));                        // Convert to bi-level bitmap:                        using (var f = tbmp.ToBilevelBitmap())                            tw.AppendFrame(f);                    }                }                // Add original image:                tw.AppendFrame(bmp);            }            ms.Seek(0, SeekOrigin.Begin);            return ms;        }    }}