Signature not being rendered

[benjinus]

Describe the bug
Use the wasm version, the signature in the page not rendered. any way to render the signature?

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://pdfviewer.github.io/'

2. open the pdf document attached here
   in_pdfbox_2.0.3.pdf

3. See error, the signature is not rendered

Screenshots

System (please complete the following information):

• OS: Mac sonoma
• Version pdfium-lib 6183
• Target wasm

[paulocoutinhox]

Strange, because i open in a PDF editor and it don't show too:

[paulocoutinhox]

I tried on canva.com and the problem is the same:

I tried on an online pdf editor too, and the problem is the same:

Maybe the problem is how you put your signature in PDF.

[paulocoutinhox]

Hi,

It appear be a more general problem with PDFium and is not related to this project in particular.

I open in Apple Preview app and in Chrome app, and the Chrome that use PDFium, the problem still happen.

I post a issue on Google Groups of PDFium and we can see if anyone help us:
https://groups.google.com/g/pdfium/c/o23SlFQJn6o

Thanks.

[mara004]

If you think this is a bug in pdfium, you should probably use the bugtracker at https://issues.chromium.org/issues?q=componentid:1586257%2B%20is:open
I don't think they keep track of issues posted on the mailing list.

[paulocoutinhox]

This is the Freddy Ferkel (from pdfium group) answer:

what are you rendering? the page? if yes and it is a signature field, you should also render the corresponding form (form->annot->widget->signature with FPDF_FFLDraw).
see also the documentation, for example, FPDF_RenderPageBitmap. which says: With the FPDF_ANNOT flag, it renders all annotations that do not require user-interaction, which are all annotations except widget and popup annotations.

and:

I looked at the file. It does contain a signature and a widget, but it looks to me that the file is not structured correctly. I'm not a PDF expert but search for "17 0 obj", there are two objects with the number 17. Maybe this could be the problem?

The PDF can be generated wrong?

[paulocoutinhox]

He make a test removing the problem and it render: