Re: Issue 838 in lilypond: Inconsistency in tests output size

[lilypond]

Updates:
        Labels: -Patch

Comment #14 on issue 838 by pnorcks: Inconsistency in tests output size
http://code.google.com/p/lilypond/issues/detail?id=838

Thanks Han-Wen.

Yes, the Pango_font objects are stored in a hash table (pango_dict_) which  
is a
member of All_font_metrics.

The problem, as I see it right now, is that the PangoFontDescription passed  
to
All_font_metrics::find_pango_font() does not reflect the state of an
already-processed Pango_font object.  As a result, Pango_font objects may  
be reused
too often.

In pango-font.cc, Pango may split a bidirectional markup string into  
multiple pieces
(with a PangoLayout), and each piece can theoretically use a different  
font, so the
original PangoFontDescription would no longer contain enough information to
effectively choose a Pango_font object.

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