[luatex] subtle bug in generating PDF outlines

[luigi scarso]

On Sun, 5 Jan 2025 at 17:03, Werner LEMBERG <wl at gnu.org> wrote:

>
> > The key point is that with qpdf one can edit the *qdf* file (i.e
> > notation.qdf in our case) and call
> >
> >   fix-qdf notation.qdf > notation-edited.pdf
> >
> > to have a pdf.
>
> OK – I hope you can find and fix the problem easily.  If this doesn't
> work I can provide a large tarball with all of the necessary LilyPond
> input files.
>

hm, iiuc this is the problem
 45201 0 obj
<<
  /Names [ (Gregorian accidentals and key signatures) 1731 0 R
      (Gregorian articulation signs) 1733 0 R (Gregorian chant contexts)
      1729 0 R (Gregorian clefs) 1730 0 R (Gregorian square neume ligatures)
      1840 0 R (Grid lines) 1231 0 R (Grouping staves) 1206 0 R
      (Guile predicates) 2649 0 R (Guitar) 1542 0 R (Harmonics)
      1530 0 R (Harp) 1523 0 R (Harp pedals) 1525 0 R (Hidden notes)
      1223 0 R (Hiding staves) 1212 0 R (Horizontal spacing) 2190 0 R
      (Horizontal spacing overview) 2191 0 R (Horizontal spacing paper
variables)
      2158 0 R (How to prevent sharing of music expressions) 2012 0 R
      (Hufnagel glyphs) 2509 0 R (Improvisation) 905 0 R (Incipits)
      1849 0 R (Including LilyPond files) 2004 0 R (Indicating harmonics
and dampened notes)
      1544 0 R (Indicating position and barring) 1543 0 R (Indicating power
chords)
      1545 0 R (Input modes) 1875 0 R (Input structure) 1876 0 R
      (Inside the staff) 1219 0 R (Instantiating new staves) 1205 0 R
      (Instrument-specific markup) 2623 0 R (Instrument-specific scripts)
      2633 0 R (Instrument names) 1214 0 R ]
  /Limits [ (Gregorian accidentals and key signatures) (Instrument names) ]
>>
endobj
the keys of /Names are not correctly sorted,


/*tex Sort |dest_names| by names: */

static int dest_cmp(const void *a, const void *b)
{
    dest_name_entry aa = *(const dest_name_entry *) a;
    dest_name_entry bb = *(const dest_name_entry *) b;
    return strcmp(aa.objname, bb.objname);
}

void sort_dest_names(PDF pdf)
{
    qsort(pdf->dest_names, (size_t) pdf->dest_names_ptr,
sizeof(dest_name_entry), dest_cmp);
}

/*tex

    Output the name tree. The tree nature of the destination list forces the
    storing of intermediate data in |obj_info| and |obj_aux| fields, which
is
    further uglified by the fact that |obj_tab| entries do not accept char
    pointers.

*/

int output_name_tree(PDF pdf)
{
    /*tex A flag for name tree output: is it |/Names| or |/Kids|: */
    boolean is_names = true;
    /*tex
        The index of current child of |l|; if |k < pdf_dest_names_ptr| then
this
        is pointer to |dest_names| array; otherwise it is the pointer to
        |obj_tab| (object number).
    */
    int k = 0;
    int b = 0;
    int m, j, l;
    int dests = 0;
    int names_head = 0;
    int names_tail = 0;
    if (pdf->dest_names_ptr == 0) {
        goto DONE;
    }
    sort_dest_names(pdf);
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