[cairo] Misplaced glyphs in PDF backend
otaylor at redhat.com
Sat Aug 20 06:17:11 PDT 2005
On Sat, 2005-08-20 at 11:38 +0100, Gustavo J. A. M. Carneiro wrote:
> On Fri, 2005-08-19 at 18:26 -0400, Owen Taylor wrote:
> > [ Meant to Cc: the list, but forgot. Resent ]
> > On Mon, 2005-06-13 at 21:56 +0100, Gustavo J. A. M. Carneiro wrote:
> > > OK, I think I have a real bug here. Not sure whether it is cairo or
> > > pango bug. My initial bet is on cairo.
> > I'd suggest you file this bug in bugs.freedesktop.org, so we don't
> > forget about it. It would, of course, be nicer to have a test case
> > that doesn't use Pango, but failing that, a pangocairo test case
> > would give us something to work with.
> The test program I used was:
> > Pango doesn't know about any difference between PDF and PNG, so
> > if the output is different, it probably is a PDF backend bug.
> Thanks. That was one of my initial doubts. I wasn't so sure how
> pango and cairo text rendering were related, or whether the bug could be
> in pango. So, pangocairo just does layout and cairo provides the
> individual glyphs, with respective metrics, I suppose? In such case, I
> suppose I could trigger this with a cairo-only test program, and I'll
> try to do so soon.
Pango asks for glyph metrics from Cairo, lays out the characters based
on those metrics, then gives the glyphs and metrics to Cairo to
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