On Fri, Feb 12, 2016 at 12:08 AM, Carlos Villegas <c...@uniscope.jp> wrote:
> Thanks, I'll try your suggestions. > > The open issues in Thai glyph composition are major, basically the output > is simply not acceptable. > Understood. > Correct positioning of vowels, diacritics and tonemarks is not a esthetic > thing only, sometimes when they are in the wrong position they print on top > of each other or on top of the wrong base character. So I wouldn't say > FOP supports Thai! > Actually, I read and speak Thai, so I would agree. It will be useful to resolve these last bugs on the Thai script support so folks can start using FOP for Thai content. > > I have Java code that I can donate that does glyph substitution for Thai, > but this is based on the fact that Thai fonts also encode alternate glyphs > into the Unicode user range. > This approach is not acceptable in FOP due to the reliance upon non-standard coding and font dependent usage. FOP will only use of GSUB/GPOS font tables, so we need to make this work properly for Thai. > There are basically two encodings: Microsoft's and Mac's, and my code > works with Microsoft's fonts. However, I think, the right way to do this is > to read the font's own substitution tables, this information must be there > inside the fonts, and use that. But if the font doesn't really have that > information, my code could be use as a fallback if you at least know that > it is a Microsoft encoded font. > > Carlos > > > On 2/12/16 15:11, Glenn Adams wrote: > > > > On Thu, Feb 11, 2016 at 9:23 PM, Carlos Villegas < <c...@uniscope.jp> > c...@uniscope.jp> wrote: > >> I'm trying to use FOP 2.0 to render Thai language. FOP doesn't really >> support Thai script > > > FOP does support Thai, at least glyph composition, though there appears to > be a few open issues (FOP-2092 > <https://issues.apache.org/jira/browse/FOP-2092>, FOP-2355 > <https://issues.apache.org/jira/browse/FOP-2355>). It is also true that > FOP is not presently performing line breaking in phrase internal positions ( > FOP-2066 <https://issues.apache.org/jira/browse/FOP-2266>), which > proposes a solution to employ ICU and use dictionary based LB. > > >> , so I'm using an external program (libthai) to do glyph composition and >> word breaking. >> Thai doesn't use spaces to separate words, so I was just inserting zero >> width spaces to separate words. This works fine. >> However, for justified text, these zero width spaces don't stretch, so >> nothing happens, I get no justified text. >> So, I tried to use fo:character with character set to zero width space, >> and setting the letter-spacing.maximum to allow some stretching. >> > > Zero width space (U+200B) is not treated as a word separator space by > default. Have you tried something like: > > <fo:character treat-as-word-space='true'>​</fo:character> > > If that doesn't work, then keep in mind that letter spacing has no meaning > when applied to a single character, but applies to a sequence of > characters. Accordingly, I would try something like: > > <fo:inline letter-spacing.minimum="0em" > letter-spacing.maximum="0.1em">​​</fo:inline> > > or > > <fo:inline letter-spacing.minimum="0em" > letter-spacing.maximum="0.1em">​<fo:character > treat-as-word-space='true'>​</fo:character></fo:inline> > > If neither approach works, it may require some time with a visual > debugger, e.g., Eclipse, to step through the code and find out where things > go wrong. > > > >> But now FOP doesn't seem to treat the zero width space as such this way, >> it doesn't break anymore at all! >> >> Note that Thai does make use of regular spaces to separate sentences and >> for other purposes but there's no guarantee that you have spaces in a given >> paragraph or in case of long sentences. >> >> Is there a way to insert a breakable space with minimum and optimum to >> zero width and some small value for maximum? >> >> Carlos >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org >> For additional commands, e-mail: <fop-users-h...@xmlgraphics.apache.org> >> fop-users-h...@xmlgraphics.apache.org >> >> > >
