//// 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.Text;using GrapeCity.Documents.Imaging;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsImagingWeb.Demos{    // This sample shows how to extract frames from a TIFF image,    // and how to read them as GcBitmap instances.    public class ExtractFrames    {        public GcBitmap GenerateImage(Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // Create the resulting image:            var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, opaque, dpi, dpi);
            // If there is a possibility that we will not fill some areas of the target bitmap            // (as in this case where the number of frames in the TIFF may be less than 4),            // we MUST clear the resulting bitmap as GcBitmap ctor does NOT clear the memory            // allocated for the pixels (to save time, as initializing large bitmaps may be            // very slow):            bmp.Clear();
            // Sample TIFF image path:            var imagePath = Path.Combine("Resources", "ImagesBis", "BmpWriteTiff3.tiff");
            // List to hold bitmaps for the TIFF frames:            GcBitmap[] frameBmps;
            // Read all frames from the TIFF file:            using (var stm = new FileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, FileOptions.RandomAccess))            using (var tr = new GcTiffReader(stm))            {                frameBmps = new GcBitmap[tr.Frames.Count];                for (int i = 0; i < tr.Frames.Count; ++i)                {                    frameBmps[i] = tr.Frames[i].ToGcBitmap();                    frameBmps[i].Opaque = opaque;                }            }
            // Resize and render the frames' bitmaps into the resulting image:            int w = pixelSize.Width / 2;            int h = pixelSize.Height / 2;            if (frameBmps.Length > 0)                using (var tbmp = frameBmps[0].Resize(w, h))                    bmp.BitBlt(tbmp, 0, 0);            if (frameBmps.Length > 1)                using (var tbmp = frameBmps[1].Resize(w, h))                    bmp.BitBlt(tbmp, w, 0);            if (frameBmps.Length > 2)                using (var tbmp = frameBmps[2].Resize(w, h))                    bmp.BitBlt(tbmp, 0, h);            if (frameBmps.Length > 3)                using (var tbmp = frameBmps[3].Resize(w, h))                    bmp.BitBlt(tbmp, w, h);
            // Dispose the frame bitmaps:            foreach (var tbmp in frameBmps)                tbmp.Dispose();
            // Add borders between the quadrants, and captions for each:            using (var g = bmp.CreateGraphics())            {                var foreColor = Color.Yellow;                var backColor = Color.Blue;                var font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "FreeMono.ttf"));                var lineh = 2;                g.DrawLine(w, 0, w, h * 2, new GCDRAW.Pen(Color.Gray, lineh * 2));                g.DrawLine(0, h, w * 2, h, new GCDRAW.Pen(Color.Gray, lineh * 2));                var tf = new TextFormat() { Font = font, FontSize = 18, ForeColor = foreColor, BackColor = backColor, FontBold = true };                var th = g.MeasureString("QWERTY", tf).Height;                if (frameBmps.Length > 0)                    g.DrawString(" Frame 0 ", tf, new PointF(0, h - th + lineh));                if (frameBmps.Length > 1)                    g.DrawString(" Frame 1 ", tf, new PointF(w + lineh, h - th + lineh));                if (frameBmps.Length > 2)                    g.DrawString(" Frame 2 ", tf, new PointF(0, h * 2 + lineh - th + lineh));                if (frameBmps.Length > 3)                    g.DrawString(" Frame 3 ", tf, new PointF(w + lineh, h * 2 + lineh - th + lineh));            }
            return bmp;        }    }}