//// 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.Imaging;using GrapeCity.Documents.Html;
namespace DsImagingWeb.Demos{    // This sample shows how to render a web page specified by a URL    // to an image (here we render the Google home page) using DsHtml.    //    // DsHtml natively supports JPEG, PNG and WebP image formats.    // For these formats, we directly use the GcHtmlRenderer class    // to render the page to a temporary image file, which is then    // copied to the output stream.    //    // Other image formats (BMP, GIF, TIFF) require rendering HTML    // to a temporary GcBitmap, and saving that to the target format.    //    // Please see notes in comments at the top of HelloWorldHtml    // sample code for details on adding DsHtml to your projects.    public class RenderPage0    {        public Stream GenerateImageStream(string targetMime, Size pixelSize, float dpi, bool opaque, string[] sampleParams = null)        {            // The Uri of the web page to render:            var uri = new Uri("http://www.google.com");
            // Depending on the target format, we may need a temp file:            string tfile = null;
            // The stream to contain the return image:            var ms = new MemoryStream();
            // Create an instance of GcHtmlBrowser that is used to render HTML:            using var browser = Common.Util.NewHtmlBrowser();            // Create an HtmlPage instance rendering the source Uri:            using var htmlPage = browser.NewPage(uri, new PageOptions() { WindowSize = pixelSize });
            // JPEG, PNG and WebP are natively supported by DsHtml. Other image formats can be            // supported by rendering to a GcBitmap and saving it to the target format:            switch (targetMime)            {                case Common.Util.MimeTypes.JPEG:                    tfile = Path.GetTempFileName();                    htmlPage.SaveAsJpeg(tfile, new JpegOptions());                    break;                case Common.Util.MimeTypes.PNG:                    tfile = Path.GetTempFileName();                    htmlPage.SaveAsPng(tfile, new PngOptions());                    break;                case Common.Util.MimeTypes.WEBP:                    tfile = Path.GetTempFileName();                    htmlPage.SaveAsWebp(tfile, new WebpOptions());                    break;                default:                    using (var bmp = new GcBitmap(pixelSize.Width, pixelSize.Height, true, dpi, dpi))                    {                        htmlPage.Render(bmp, new PngOptions());                        switch (targetMime)                        {                            case Common.Util.MimeTypes.BMP:                                bmp.SaveAsBmp(ms);                                break;                            case Common.Util.MimeTypes.GIF:                                bmp.SaveAsGif(ms);                                break;                            case Common.Util.MimeTypes.TIFF:                                bmp.SaveAsTiff(ms);                                break;                            case Common.Util.MimeTypes.ICO:                                bmp.SaveAsIco(ms, null, IcoFrameEncoding.Png);                                break;                            default:                                throw new Exception("Unexpected.");                        }                    }                    break;            }            // If a temp file was used, copy the created image from the temp file and clean up:            if (!string.IsNullOrEmpty(tfile))            {                using (var ts = File.OpenRead(tfile))                    ts.CopyTo(ms);                File.Delete(tfile);            }            // Done.            ms.Seek(0, SeekOrigin.Begin);            return ms;        }    }}