Width for bounding box of highly tilted characters

This Inkscape bug:


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




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
mathog caltech edu
Manager, Sequence Analysis Facility, Biology Division, Caltech

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