How to convert a XPS file to an image in high quality (rather than blurry low resolution)?

user_826438 0
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I'm trying to convert an XPS with WPF.

The idea is that these images can be loaded with silverlight 4, for this I am using the following code:

 // XPS Document
            XpsDocument xpsDoc = new XpsDocument(xpsFileName, System.IO.FileAccess.Read);
            FixedDocumentSequence docSeq = xpsDoc.GetFixedDocumentSequence();

        // The number of pages
        PageCount = docSeq.References[0].GetDocument(false).Pages.Count;

        DocumentPage sizePage = docSeq.DocumentPaginator.GetPage(0);
        PageHeight = sizePage.Size.Height;
        PageWidth = sizePage.Size.Width;
        // Scale dimensions from 96 dpi to 600 dpi.
        double scale = 300/ 96;

        // Convert a XPS page to a PNG file
        for (int pageNum = 0; pageNum < PageCount; pageNum++)
        {
            DocumentPage docPage = docSeq.DocumentPaginator.GetPage(pageNum);
            BitmapImage bitmap = new BitmapImage();
            RenderTargetBitmap renderTarget =
                new RenderTargetBitmap((int)(scale * (docPage.Size.Height + 1)),
                                                               (int)(scale * (docPage.Size.Height + 1)),
                                                               scale * 96,
                                                               scale * 96, PixelFormats.Pbgra32);
            renderTarget.Render(docPage.Visual);


            PngBitmapEncoder encoder = new PngBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(renderTarget));

            FileStream pageOutStream = new FileStream(name + ".Page" + pageNum + ".png", FileMode.Create, FileAccess.Write);
            encoder.Save(pageOutStream);
            pageOutStream.Close();

This code is taken from http://xpsreader.codeplex.com/ a project to convert an XPS document. works great! But the problem is that the image is low resolution and blurry. I researched and found that RenderTargetBitmap and find on this page: http://www.codeproject.com/Questions/213737/Render-target-bitmap-quality-issues

The issue here is you Have That does not use hardware RenderTargetBitmap rendering.

One solution is to use DirectX with WPF to do this, but have not found any clear example to show me the right way to do it.

I appreciate suggestions. Thanks in advance.

Update:I attached the XPS document, I am trying to convert the image Please download test.xps

rendertargetbitmap silverlight xps wpf c#
4 Answers
    private IList<byte[]> GetTifPagesFromXps(string xXpsFileName, double xQuality)
    {
        using (var xpsDoc = new XpsDocument(xXpsFileName, FileAccess.Read))
        {
            var docSeq = xpsDoc.GetFixedDocumentSequence();

            var tifPages = new List<byte[]>();
            for (var i = 0; i < docSeq.DocumentPaginator.PageCount; i++)
            {
                using (var docPage = docSeq.DocumentPaginator.GetPage(i))
                {
                    var renderTarget = new RenderTargetBitmap((int)(docPage.Size.Width * xQuality), (int)(docPage.Size.Height * xQuality), 96 * xQuality, 96 * xQuality, PixelFormats.Default);

                    renderTarget.Render(docPage.Visual);

                    var jpegEncoder = new JpegBitmapEncoder { QualityLevel = 100 };
                    jpegEncoder.Frames.Add(BitmapFrame.Create(renderTarget));

                    byte[] buffer;
                    using (var memoryStream = new MemoryStream())
                    {
                        jpegEncoder.Save(memoryStream);
                        memoryStream.Seek(0, SeekOrigin.Begin);
                        buffer = memoryStream.GetBuffer();
                    }
                    tifPages.Add(buffer);
                }
            }

            xpsDoc.Close();
            return tifPages.ToArray();
        }
    }
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