On 19/11/12 21:35, Jonathan Kew wrote:
I've put a test page at http://people.mozilla.org/~jkew/kh/test.html
that renders the sequences "ក្រុ ខេ គៀ" with 100+ fonts from several
sources. They're mostly different versions of KhmerOS fonts, but there
are a few others as well.
Some initial observations:
(a) The font "Sankor.ttf" fails completely; inspection shows that it
lacks any OpenType features, either Indic-style or generic. So we can
ignore that one.
(b) A number of the fonts - colored red in the test page - are rejected
by OTS (for having a bad OS/2 table; I haven't looked into details) in
Firefox and Chrome, and so you'll get fallback to whatever your local
default is. In Firefox, at least, you can set
gfx.downloadable_fonts.sanitize to false in about:config (and reload the
page) to bypass the sanitizer and see the actual fonts.
(c) In current Firefox Nightly, which has harfbuzz
43b653150081a2f9dc6b7481229ac4cd952575dc, almost all the fonts shape
correctly; the exception is Hanuman.
(d) If I make the change suggested above, so that Khmer fonts with
'liga' are shaped via the Indic shaper (but with 'liga' disabled), this
fixes Hanuman, but breaks a bunch of other fonts where the pre-base Ra
no longer happens - in particular, all the KhUnicode210 collection, and
a number of the KhmerUnicodeFonts. Many of those that break are the red
samples that OTS would reject as webfonts, but some of the non-red ones
break as well.
(e) Of course, if we also revert the liga-disabling commit, a number of
the fonts (all the KhUnicode210 faces, and about half the
KhmerUnicodeFonts faces) exhibit the problem of doubling the left part
of the matra in "គៀ", which was what started us into this morass.
Sorry, hit Send prematurely on this... I was going to add one further note:
(f) A considerable number of the fonts, including the Hanuman font
that's currently appearing broken on http://khmer.rfa.org, don't load in
IE9 at all. Some of them (including Hanuman) are rejected because of
embedding permissions (IE9 insists the embedding flags must allow
"installable embedding"), others generate generic "@font-face
encountered unknown error" messages. However, Hanuman does work in IE9
if installed locally.
JK
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