Commit Graph

101 Commits

Author SHA1 Message Date
Behdad Esfahbod 79d1007a50 If variation selector is not consumed by cmap, pass it on to GSUB
This changes the semantics of get_glyph() callback and expect that
callbacks return false if the requested variant is not available, and
then we will call them back with variation_selector=0 and will retain
the glyph for the selector in the glyph stream.

Apparently most Mongolian fonts implement the Mongolian Variation
Selectors using GSUB, not cmap.

https://bugs.freedesktop.org/show_bug.cgi?id=65258

Note that this doesn't fix the Mongolian shaping yet, because the way
that's implemented is that the, say, 'init' feature ligates the letter
and the variation-selector.  However, since currently the variation
selector doesn't have the 'init' mask on, it will not be matched...
2013-06-13 19:01:07 -04:00
Behdad Esfahbod c7a8491720 Skip over multiple variation selectors in a row 2013-06-10 15:08:49 -04:00
Behdad Esfahbod 269de14dda Don't compose Hangul jamo
See thread "an issue regarding discrepancy between Korean and Unicode
standards" on the mailing list for the rationale.  In short: Uniscribe
doesn't, so fonts are designed to work without it.
2013-04-04 23:06:54 -04:00
Behdad Esfahbod a88a62f70f Minor 2013-03-21 21:02:16 -04:00
Behdad Esfahbod 6e74c64211 Improve normalization heuristic
Before, for most scripts, we were not trying to recompose two characters
if the second one had ccc=0.  That fails for Myanmar where U+1026
decomposes to U+1025,U+102E, both of which have ccc=0.  However, we do
want to try to recompose those.  We now check whether the second is a
mark, using general category instead.

At the same time, remove optimization that was conflicting with this.

[Let the Ngapi hackfest begin!]
2013-02-11 12:59:00 -05:00
Behdad Esfahbod eba312c8d1 Plumbing to get shape plan and font into complex decompose function
So we can handle Sinhala split matras smartly...  Coming soon.
2012-11-16 12:58:38 -08:00
Behdad Esfahbod 0736915b8e [Indic] Decompose Sinhala split matras the way old HarfBuzz / Pango did
Had to do some refactoring to make this happen...

Under uniscribe bug compatibility mode, we still plit them
Uniscrie-style, but Jonathan and I convinced ourselves that there is no
harm doing this the Unicode way.  This change makes that happen, and
unbreaks free Sinhala fonts.
2012-11-13 12:35:35 -08:00
Behdad Esfahbod 028a1706f8 Refactor common macro 2012-09-06 14:25:48 -04:00
Behdad Esfahbod b85800f9de [Indic] Implement dotted-circle insertion for broken clusters
No panic, we reeally insert dotted circle when it's absolutely broken.

Fixes most of the dotted-circle cases against Uniscribe. (for Devanagari
fixes 80% of them, for Khmer 70%; the rest look like Uniscribe being
really bogus...)

I had to make a decision.  Apparently Uniscribe adds one dotted circle
to each broken character.  I tried that, but that goes wrong easily with
split matras.  So I made it add only one dotted circle to an entire
broken syllable tail.  As in: "if there was a dotted circle here, this
would have formed a correct cluster."  That works better for split
stuff, and I like it more.
2012-08-31 19:18:20 -04:00
Behdad Esfahbod f4cb476298 [OT] Slightly adjust normalizer
The change is very subtle.  If we have a single-char cluster that
decomposes to three or more characters, then try recomposition, in
case the farther mark may compose with the base.
2012-08-10 03:51:44 -04:00
Behdad Esfahbod 07d6828063 Minor 2012-08-10 03:28:50 -04:00
Behdad Esfahbod b00321ea78 [OT] Avoid calling get_glyph() twice
Essentially move the glyph mapping to normalization process.
The effect on Devanagari is small (but observable).  Should be more
observable in simple text, like ASCII.
2012-08-09 22:33:32 -04:00
Behdad Esfahbod 8d1eef3f32 Minor 2012-08-09 21:35:47 -04:00
Behdad Esfahbod 0f8881d6bb More refactoring 2012-08-07 16:57:02 -04:00
Behdad Esfahbod 428dfcab66 Minor refactoring 2012-08-07 16:51:48 -04:00
Behdad Esfahbod 8fbfda920e Inline font getters 2012-08-01 19:03:46 -04:00
Behdad Esfahbod 208f70f055 Inline Unicode callbacks internally 2012-08-01 17:13:10 -04:00
Behdad Esfahbod 84186a6400 Add commentary on the compatibility decomposition in the normalizer 2012-08-01 13:32:39 -04:00
Behdad Esfahbod 378d279bbf Implement Unicode compatibility decompositions
Based on patch from Philip Withnall.
https://bugs.freedesktop.org/show_bug.cgi?id=41095
2012-07-31 21:36:16 -04:00
Behdad Esfahbod bc8357ea7b Merge clusters during normalization 2012-06-08 21:01:20 -04:00
Behdad Esfahbod 0594a24484 Cleanup TRUE/FALSE vs true/false 2012-06-05 20:35:40 -04:00
Behdad Esfahbod 9f377ed321 Fix more unused-var warnings 2012-05-13 16:13:44 +02:00
Behdad Esfahbod 99c2695759 Add accessort to buffer for current info, current pos, and prev info 2012-05-13 15:45:18 +02:00
Behdad Esfahbod d1deaa2f5b Replace zerowidth invisible chars with a zero-advance space glyph
Like Uniscribe does.
2012-05-09 15:04:13 +02:00
Behdad Esfahbod 29a7e306e3 Minor 2012-04-24 16:01:30 -04:00
Behdad Esfahbod 683b503f30 Minor 2012-04-14 20:47:14 -04:00
Behdad Esfahbod 9683184553 Implement normalization mode HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_FULL
In this mode we try composing CCC=0 with CCC=0 characters.  Useful for
Hangul.
2012-04-07 15:06:47 -04:00
Behdad Esfahbod bec2ac4fde Bring normalization algorithm closer to the spec
No logical difference so far.
2012-04-07 14:51:17 -04:00
Behdad Esfahbod e02d925786 Flip logic around 2012-04-07 14:49:13 -04:00
Behdad Esfahbod 11138ccff7 Add normalize mode
In preparation for Hangul shaper.
2012-04-05 17:25:19 -04:00
Behdad Esfahbod 6769f21d57 More moving code around 2012-04-05 16:46:46 -04:00
Behdad Esfahbod e3b2e077f5 Typo 2012-03-07 10:21:24 -05:00
Behdad Esfahbod c346671b6b Minor doc fixes 2012-03-06 20:47:50 -05:00
Behdad Esfahbod af913c5788 Fix infinite loop in normalization code with variation selectors
Reported by Jonathan Kew.
2011-10-17 11:39:28 -07:00
Behdad Esfahbod 55deff7595 Add comments 2011-09-28 16:20:09 -04:00
Behdad Esfahbod 947c9a778c Minor 2011-09-16 16:33:18 -04:00
Behdad Esfahbod 36b10f58cc Minor 2011-09-15 16:29:51 -04:00
Behdad Esfahbod c605bbbb6d Remove C++ guards from source files
Where causing issues for people with MSVC.
2011-08-04 20:00:53 -04:00
Behdad Esfahbod 45d6f29f15 [Indic] Reorder matras
Number of failing shape-complex tests goes from 125 down to 94.

Next: Add Ra handling and it's fair to say we kinda support Indic :).
2011-07-30 14:44:30 -04:00
Behdad Esfahbod c311d85208 Keep Unicode props updated as we go so we avoid a scan later 2011-07-23 23:43:54 -04:00
Behdad Esfahbod 5389ff4dbc Implement the Unicode Canonical Composition algorithm
Fallback normalization is complete and working now!
2011-07-22 20:22:49 -04:00
Behdad Esfahbod dcdc51cdc0 Handle singleton decompositions 2011-07-22 17:14:46 -04:00
Behdad Esfahbod 34c22f8168 Implement Unicode Canonical Reordering Algorithm 2011-07-22 17:04:20 -04:00
Behdad Esfahbod 4ff0d2d9df Decomposition works now! 2011-07-22 16:15:32 -04:00
Behdad Esfahbod 468e9cb25c Move buffer methods into the object 2011-07-22 14:49:14 -04:00
Behdad Esfahbod 45412523dc More normalization kick 2011-07-22 11:07:05 -04:00
Behdad Esfahbod 5d90a342e3 Document normalization design 2011-07-21 15:25:01 -04:00
Behdad Esfahbod d6b9c6d200 More kicking 2011-07-21 12:16:45 -04:00
Behdad Esfahbod 192445aef2 Remove intermittent_glyph()
Lets not worry about performance for now...
2011-07-21 12:13:04 -04:00
Behdad Esfahbod 5c6f5982d7 Towards normalization 2011-07-21 11:31:08 -04:00
Behdad Esfahbod 655586fe5e Towards normalization 2011-07-21 00:52:42 -04:00