Certain types of pdfs are not visible .

[zerocold96]

Using the Zoomable pdf viewer worked great at first, but then I noticed a small subsect of pdf that can't be display. I Looked around the code and the one thing I noticed is that CGPDFDocument is reading the file just fine, but when it is time to create the subsampling image the view shows a white page.

I exported the pdfs to pdf on my mac and now the file is bigger and they can be view on the device. Is it a compression issues? or is the formatting for the original pdf different?

// make the initial view 'fit to width'
            CGRect pageRect = page.GetBoxRect (CGPDFBox.Media);
            //scale = Frame.Width / pageRect.Width;
            scale = Frame.Width / pageRect.Width;
            pageRect.Size = new CGSize (pageRect.Width * scale , pageRect.Height * scale);

            // create bitmap version of the PDF page, to be used (scaled)
            // when no other (tiled) view are visible
            UIGraphics.BeginImageContext (pageRect.Size);
            CGContext context = UIGraphics.GetCurrentContext ();
            //CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
            //CGBitmapContext context = new CGBitmapContext(null, (int)pageRect.Size.Width, (int)pageRect.Size.Height, 8, (int)pageRect.Size.Width * 4, colorSpace , CGImageAlphaInfo.PremultipliedLast);

            // fill with white background
            context.SetFillColor (1.0f, 1.0f, 1.0f, 1.0f);
            context.FillRect (pageRect);
            context.SaveState ();

[olegoid]

Hi @zerocold96, could you attach your pdf file?

[zerocold96]

15b9a77c-a05d-4dcb-9f38-e7423c55474e.pdf

It displays only a white page.

[Arpit360]

I have reported bug in bugzilla for this issue
https://bugzilla.xamarin.com/show_bug.cgi?id=42229

[olegoid]

@zerocold96, I think there's nothing wrong with ZoomingPdfViewer sample. It's desgined to work this way and it seems like document you're using is too large to be displayed correctly with this app. However you can try other samples like QuartzSample where your pdf file displayed correcly.

[zerocold96]

Yes the quartzsample can read the pdf just fine.... this is odd. I will compare the samples and make notes of the differences. I must make a point of saying that I have other pdf files that do work just fine this way and are about the same size or bigger (both mb and pixels).