How do I get X,Y pos and PangoLogAttr of each glyph in a rendered string?

[Alex Kerr <alex phonething com>]

Hello,

I'm using a really basic Cairo Pango prog as a test bed. It just 
displays a short string on a Cairo surface using a Pango layout, which 
works fine.

For each glyph in the string, I now want to get it's X,Y pos (and width 
and height) on the rendered Cairo surface, and the PangoLogAttr data, 
e.g. so I could draw a box around each glyph, or whatever.

After a lot of reading the API stuff, and googling for examples, I'm not 
quite sure how to tie the API functions together to achieve this. Anyone 
got any suggestions, ideas, or code please?

Pseudocode for what I'm trying to do would be:

1. Render Pango text to Cairo surface (note: could be right-to-left, 
e.g. Arabic, as well as left-to-right) - Done this.

2. For each glyph (or ligature) in the line of text:
    {
    3. Get X, Y, Width and Height of rendered glyph (or ligature)
    4. Get the PangoLogAttr structure for the same character
    5. Move onto the next glyph (/ligature/character) in the line
    }

P.S. As a separate side note, I understand glyphs to be the separate 
components of a final rendered character, i.e. the main body and 
diacritic (if present) would be separate glyphs. Each glyph in turn 
could possibly be made up of more than one UTF-8 character. The 
rendering engine can potentially combine certain combinations of glyphs 
to form a single ligature. Glyphs or ligatures can also be referred to 
as characters (so PangoLogAttr applies to ligatures and glyphs?). Have I 
got this right!?

Any help much appreciated :)

Many thanks indeed!
Alex