Thanks, I'll try your suggestions.
The open issues in Thai glyph composition are major, basically the
output is simply not acceptable. 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!
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.
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 <[email protected]
<mailto:[email protected]>> 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:
[email protected]
<mailto:[email protected]>
For additional commands, e-mail:
[email protected]
<mailto:[email protected]>
