[cairo] BUG: PDF page links

[Knut Petersen]

Hi everybody!

I use this C++ code to generate page hyperlinks with the pdf backend:

       for (auto &cr : Cairo_output.contexts) // loop over a set pf crs
         {
           cairo_tag_begin (cr, CAIRO_TAG_LINK, attr.c_str ());
           cairo_tag_end (cr, CAIRO_TAG_LINK);
         }
       debug_output (_f ("page-link %s", attr.c_str ()));

All the following attribute strings passed to cairo_tag_begin should be ok:

    page-link rect=[ 245.195312 482.759313 101.537008 -9.776040 ] page=2 pos=[0.0 0.0]
    page-link rect=[ 246.871094 50.185095 101.537008 -9.776040 ] page=1 pos=[0.0 0.0]
    page-link rect=[ 246.871094 64.380407 101.537008 -9.776040 ] page=3 pos=[0.0 0.0]
    page-link rect=[ 246.871094 50.341345 101.537008 -9.776040 ] page=2 pos=[0.0 0.0]

But in reality cairo_tag_* fails if 'page' is a forward reference. While processing page 2 it is possible to generate a link to page 1, but a link to page 3 fails.

Tested with: cairo 1.16.0, git master.

Knut

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.cairographics.org/archives/cairo/attachments/20210723/6769d7b7/attachment.htm>