Pdf Stamp not visible

[tiarossi]

In some situations the stamp attached to the pdf document is not shown by pdfjs as expected.

This happens with the following file: https://drive.google.com/file/d/0B4lYWKfSQThlMGJOUjZKLVl1aWc/edit?usp=sharing

The file is displayed normally by adobe.

[timvandermeij]

I can reproduce this using Windows 7 x64, Firefox 26.0 (HWA on) and the latest PDF.js development version. Console output:

Warning: Knockout groups not supported.

Note sure if that's related though. It might also be an unsupported annotation type that is not reported in the console.

[tiarossi]

I have some more information about the issue.
We realized that if the document has attached text, ie. if it was scanned as searchable pdf (image+text), the annotation inserted after that is displayed correctly, but if it is a pure image pdf, then annotation isn't displayed.
We use Windows 7 x64, Chrome 26, 31 and 32

[timvandermeij]

According to http://brendandahl.github.io/pdf.js.utils/browser, the annotation type is /Stamp. This subtype is not supported yet according to https://github.com/mozilla/pdf.js/blob/master/src/shared/annotation.js#L25.

[timvandermeij]

Closing as fixed by #6814.