//// This code is part of Document Solutions for Imaging demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using GrapeCity.Documents.Drawing;using GrapeCity.Documents.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos{    // This sample demonstrates how convert full color RGB    // to 4 BPP and 8 BPP indexed images.    public class Indexing    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);            using (var origBmp = new GcBitmap())            {                // Load a sample photo:                var imagePath = Path.Combine("Resources", "Images", "maple.jpg");                using (var stm = new FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))                    origBmp.Load(stm);
                origBmp.SetAlphaTo255();                origBmp.Opaque = opaque;
                // Resize the original photo so we can place 4 samples of it                // on the resulting bitmap:                int w = pixelSize.Width / 2;                int h = pixelSize.Height / 2;                using (var sizedBmp = origBmp.Resize(w, h, InterpolationMode.Cubic))                using (var ib4bpp = sizedBmp.ToIndexed4bppBitmap(DitheringMethod.JarvisJudiceNinke))                using (var ib8bpp = sizedBmp.ToIndexed8bppBitmap(DitheringMethod.JarvisJudiceNinke))                using (var b4bpp = ib4bpp.ToGcBitmap())                using (var b8bpp = ib8bpp.ToGcBitmap())                {                    // Copy the original and indexed images into 4 quadrants of the resulting bitmap:                    bmp.BitBlt(sizedBmp, 0, 0);                    b4bpp.Opaque = opaque;                    bmp.BitBlt(b4bpp, w, 0);                    b8bpp.Opaque = opaque;                    bmp.BitBlt(b8bpp, 0, h);                    bmp.BitBlt(sizedBmp, w, h);                }
                // Add borders between the quadrants, and captions for each:                var lineh = 2;                using (var g = bmp.CreateGraphics(null))                {                    var foreColor = Color.Yellow;                    var backColor = Color.Blue;                    var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));                    g.DrawLine(w, 0, w, h * 2, new GCDRAW.Pen(foreColor, lineh * 2));                    g.DrawLine(0, h, w * 2, h, new GCDRAW.Pen(foreColor, lineh * 2));                    var tf = new TextFormat() { Font = font, FontSize = 18, ForeColor = foreColor, BackColor = backColor, FontBold = true };                    g.DrawString(" Original image ", tf, new PointF(0, 0));                    g.DrawString(" Indexed 4 bits per pixel ", tf, new PointF(w + lineh, 0));                    g.DrawString(" Indexed 8 bits per pixel ", tf, new PointF(0, h + lineh));                    g.DrawString(" Original image ", tf, new PointF(w + lineh, h + lineh));                }            }            return bmp;        }    }}