This Inkscape bug:
https://bugs.launchpad.net/inkscape/+bug/1283194
has been tracked down to an issue with the Queensland font (and some
other highly tilted fonts) and Pango.
The problem is this, we need to calculate a bounding box on one of these
tilted characters, but the width currently being used is too small. The
ascend and descend values from the face are fine. The width from the
font itself is also fine, here are the values (using FreeType to open
the font and pull out the characters):
letter:J advance = 1472 width = 4928
The problem is that it looks like what we need to use for the width of
this bounding box is MAX(advance,width), but what is currently being
used is PangoGlyphGeometry which holds the advance only (I think). On a
normal font like Arial that would be fine, as the advance is larger than
the width:
letter:J advance = 1600 width = 1280
For Queensland though, it is the other way around. We don't want the
bounding
box for the entire string, just the one glyph. If all one has to work
with is
glyphs[glyph_index]
and
glyphs[glyph_index].geometry.width
is the wrong value (advance, narrower than the glyph), how does one
retrieve from Pango the width (bounding box xmax - xmin) of the glyph?
Thank you,
David Mathog
mat...@caltech.edu
Manager, Sequence Analysis Facility, Biology Division, Caltech
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