[HarfBuzz] Question on converting UTF-8 codepoints to complex glyphs

[Cody Planteen]

It's possible your font isn't doing what you think it should be. You can
test this theory with the tool High-Logic FontCreator for Windows. I
believe there is a free evaluation. You can open up your font, then go to
Font -> OpenType Designer. In this dialog, you can enter your test string
and see what glyphs come out.

https://www.high-logic.com/font-editor/fontcreator


On Wed, Apr 10, 2019 at 1:19 PM Paul Daughetee <Daughetee at finaldraft.com>
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.
>
>
>
> *From:* Behdad Esfahbod <behdad at behdad.org>
> *Sent:* April 8, 2019 1:47 PM
> *To:* Paul Daughetee <Daughetee at finaldraft.com>
> *Cc:* harfbuzz at lists.freedesktop.org
> *Subject:* Re: [HarfBuzz] Question on converting UTF-8 codepoints to
> complex glyphs
>
>
>
> On Mon, Apr 8, 2019 at 4:12 PM Paul Daughetee <Daughetee at finaldraft.com>
> 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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