Oops. Forgot to Cc: list. -- Theppitak Karoonboonyanan http://linux.thai.net/~thep/
On Thu, Feb 3, 2011 at 2:35 PM, Theppitak Karoonboonyanan <[email protected]> wrote: > On Thu, Feb 3, 2011 at 1:39 PM, Peter Hunter <[email protected]> wrote: >> I'm using Harfbuzz (not Harfbuzz-ng) for shaping Thai text (using >> HB_BasicShape/HB_HeuristicPosition) >> >> Not being familiar with the Thai language, I've been told that the >> vowels/marks are positioned "too high", (particularly compared to MS >> wordPad/Notepad) >> At least with the fonts I have access to, the vowels/marks are already >> configured to an appropriate height for most situations and do not require >> the extra adjustment provided in "positionCluster" >> >> Disabling the extra adjustment however causes a problem with the positioning >> of the combining above marks when used in conjunction with 0xe1b,0xe1d,0xe1f >> characters( PO PLA, PO FA and PO FAN). (These characters all have a trailing >> vertical stem that overlaps the combining above marks when left at their >> default position) >> In wordpad/notepad these marks are left at their design height, but >> positioned left aligned with the base character. >> (The fonts appear to have been designed for this situation, but I don't know >> if that is true for Thai fonts in general) > > I also see this weird rendering on Qt applications, and confirm that this is > considered sub-optimal typography. Pango, on the other hand, positions > the glyphs more elegantly, either by the aids of PUA glyphs or OpenType > GPOS feature. > > (The PUA solution is still retained for compatibility with Windows, where > the lack of OpenType feature is a norm for Thai fonts, so users can still > use fonts designed for Windows on it.) > >> So, I'd like to know if this issue has been resolved in "-ng" or if anyone >> else has experienced and/or resolved this problem > > I wonder how to test HarfBuzz-ng per se to find it out. To my understanding, > HarfBuzz-ng is being used in Pango, but the shaping engine which > provides the proper positioning is in Pango layer, not HarfBuzz-ng. > > Regards, > -- > Theppitak Karoonboonyanan > http://linux.thai.net/~thep/ > _______________________________________________ HarfBuzz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/harfbuzz
