<div dir="ltr"><div><div>FYI the same happens with this font after khmer character ុ (glyph "vowelU") in string ពុម្ព </div>By the way, it's not only Uniscribe since InDesign and LibreOffice (ICU) seem to deal the same way with it. </div>Olivier </div><div class="gmail_extra"> <div class="gmail_quote">2013/6/14 Behdad Esfahbod <<a href="mailto:behdad@behdad.org" target="_blank">behdad@behdad.org</a>> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Ok, negative vs positive is not the bug. Uniscribe zeroes mark widths for Khmer but we don't. I tried to figure out whether Uniscribe does it by Unicode category or GDEF, but couldn't build a test font... At any rate, we need to figure out and do the same. Jonathan, any comments? behdad <div class="im"> On 13-06-13 05:31 PM, Olivier Berten wrote: > After khmer character ិ(glyph "uni17b7") in the string និង > > Olivier > > </div>> 2013/6/13 Behdad Esfahbod <<a href="mailto:behdad@behdad.org">behdad@behdad.org</a> <mailto:<a href="mailto:behdad@behdad.org">behdad@behdad.org</a>>> <div class="im">> > Ok, I'll take a look. Can you send me the font? > > That said, The HarfBuzz API uses signed integers for advance. So I'm not sure > why this is happening. Where do you observe this behavior again? > > b > > On 13-06-13 05:16 PM, Olivier Berten wrote: > > Well... Harfbuzz will be the only one behaving that way then... > > That font is rendered fine by Adobe, Microsoft, LibreOffice, ... and > fontforge > > as well as ttx/fontTools gives a negative advance width... I guess this > > doesn't push fixing the font ;-) > > > > Olivier > > > > > > 2013/6/6 Behdad Esfahbod <<a href="mailto:behdad@behdad.org">behdad@behdad.org</a> <mailto:<a href="mailto:behdad@behdad.org">behdad@behdad.org</a>> </div>> <mailto:<a href="mailto:behdad@behdad.org">behdad@behdad.org</a> <mailto:<a href="mailto:behdad@behdad.org">behdad@behdad.org</a>>>> <div class="im">> > > > Hi Olivier, > > > > Thanks for the report. I'm hesitant to make HarfBuzz return > negative advance > > values as that can confuse downstream users. If this doesn't prove > to be a > > major issue, I think we should ignore it for now. > > > > behdad > > > > On 13-06-01 05:40 PM, Olivier Berten wrote: > > > Hi! > > > > > > Although it isn't complying with the TrueType/OpenType specifications, > > > some fonts have some glyphs with negative advance width. > > > > > > Advance width (in htmx) is defined as USHORT/uint16 but it seems > > > everybody else reads it as SHORT/int16. > > > > > > In the attached font, glyph "uni17b7" (khmer character ិ) has a > > > negative advance width. You can try it with the string និងសមភាព > > > > > > I wouldn't call this a bug in harfbuzz since it's a font bug but for > > > compatibility reasons, it might be useful to change it... > > > > > > Olivier > > > > > > > > > > > > _______________________________________________ > > > HarfBuzz mailing list > > > <a href="mailto:HarfBuzz@lists.freedesktop.org">HarfBuzz@lists.freedesktop.org</a> > <mailto:<a href="mailto:HarfBuzz@lists.freedesktop.org">HarfBuzz@lists.freedesktop.org</a>> </div>> <mailto:<a href="mailto:HarfBuzz@lists.freedesktop.org">HarfBuzz@lists.freedesktop.org</a> <div class="HOEnZb"><div class="h5">> <mailto:<a href="mailto:HarfBuzz@lists.freedesktop.org">HarfBuzz@lists.freedesktop.org</a>>> > > > <a href="http://lists.freedesktop.org/mailman/listinfo/harfbuzz" target="_blank">http://lists.freedesktop.org/mailman/listinfo/harfbuzz</a> > > > > > > > -- > > behdad > > <a href="http://behdad.org/" target="_blank">http://behdad.org/</a> > > > > > > -- > behdad > <a href="http://behdad.org/" target="_blank">http://behdad.org/</a> > > </div></div>-- behdad <a href="http://behdad.org/" target="_blank">http://behdad.org/</a> </blockquote></div> </div>