On 10/04/2019 20:19, Paul Daughetee wrote:
Let me give you a little more info. I just recently built and installed
vcpkg and used it to install HarfBuzz on Windows 10. It installed
version 2.3.1-3 of the static libraries for Window x86. I linked my app
to the HarfBuzz library and its dependencies. I added code to my app to
capture single words that I could send to be processed by HarfBuzz as
they were typed by the user. I installed Google’s NotoSansTamil true
type font after verifying that it properly defined substitutions for the
ligature that is formed by the Tamil consonant “tta” when paired with a
vowel such as “u” or “I”. After processing a UTF-8 string containing the
consonant and the vowel “tta” and “u” [0xE0, 0xAE, 0x9F, 0xE0, 0xAE,
0x89], the hb_glyph_info_t object I get back has tow glyph indices, the
same indices as the “tta” and “u” (17, 10) rather than the index for the
“ttauvowelsign” (116) ligature I expected. My code is virtually
identical to the examples found in the HarfBuzz wiki and to several
examples found in git. Any help here would be greatly appreciated.
It sounds like you're not very familiar with Tamil script?
The UTF-8 sequence [0xE0, 0xAE, 0x9F, 0xE0, 0xAE, 0x89] corresponds to
the two characters <U+0B9F TAMIL LETTER TTA, U+0B89 TAMIL LETTER U>.
These are not expected to combine: U+0B89 is a "full" or standalone
vowel letter.
The ligated syllable 'ttauvowelsign' would be formed by <U+0B9F TAMIL
LETTER TTA, U+0BC1 TAMIL VOWEL SIGN U>.
JK
*From:* Behdad Esfahbod <[email protected]>
*Sent:* April 8, 2019 1:47 PM
*To:* Paul Daughetee <[email protected]>
*Cc:* [email protected]
*Subject:* Re: [HarfBuzz] Question on converting UTF-8 codepoints to
complex glyphs
On Mon, Apr 8, 2019 at 4:12 PM Paul Daughetee <[email protected]
<mailto:[email protected]>> wrote:
I’m new to HarfBuzz and attempting to use it for converting a UTF-8
string that contains one or more sets of codepoints that should
combine to form single complex glyphs to the correct string of
glyphs. I’ve followed numerous examples and they all lead me to the
point where I use hb_buffer_get_glyph_infos to get what I thought
would be a hb_glyph_info object that contains the codepoints for the
glyphs I seek. So my first question is as follows. Is that what I
should be getting? I ask because I’m not getting what I would expect
to get.
Yes.
I can’t even successfully get a complex glyph to represent the
combination of the letter A and the grave accent. So if I’m just
confused as to how or what HarfBuzz does, please help me find a
better path. Thanks!
What do you get? A + grave-accent only forms one glyph if the font was
designed so. It may very well be represented by two glyphs.
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behdad
http://behdad.org/
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