[HarfBuzz] Cluster question (Was Cluster soap box time)

Behdad Esfahbod behdad at behdad.org
Sat Dec 15 21:19:20 UTC 2018

On Thu, Dec 13, 2018 at 11:05 PM Ansel Sermersheim <ansel at copperspice.com>

> On 11/29/18 7:29 AM, Behdad Esfahbod wrote:
> On Tue, Nov 27, 2018 at 8:34 PM Ansel Sermersheim <ansel at copperspice.com>
> wrote:
>> On 11/19/2018 07:16 PM, Behdad Esfahbod wrote:
>> Hi Ansel,
>> On Mon, Nov 19, 2018 at 7:44 PM Ansel Sermersheim <ansel at copperspice.com>
>> wrote:
>>> ...We have tried cluster
>>> levels 0 and 1, and neither one worked as we expected. In every case,
>>> combining accents are marked as being in a separate cluster to the base
>>> codepoint. For example, U+0061 Latin Small Letter A followed by U+0308
>>> Combining Diaeresis are being placed in adjacent clusters rather than
>>> the same cluster.
>> That doesn't sound right.  Are you setting any custom unicode-funcs on
>> the buffer?  Only thing I can think of that can do this is faulty / missing
>> Unicode funcs.
>> We had a feeling something was missing. No, we are not supplying any
>> unicode funcs. Do you have a sample or documentation reference for what we
>> need to supply?
> Not supplying anything is good.  Was just ruling out that as a cause.
>> I have looked at the online documentation without seeing a clear list of
>> what is required. We are specifically looking to use harfbuzz to decipher
>> special case grapheme breaks.
> Can you check with hb-shape command-line tool, to make sure what you
> expect is what HarfBuzz produces there?
> Sorry it took a while to get back with you, we really do appreciate your
> help. We have been looking over the code and we believe we are having a
> problem with missing unicode callback functions. We are compiling HarfBuzz
> with the following options turned on:
> I am particularly suspicious of the HB_NO_UNICODE_FUNCS define. Am I
> correct in thinking that this is suppressing the built-in harfbuzz unicode
> functions, so we must supply our own?
Or just use hb-ucdn that is shipped with HarfBuzz.

> Thanks so much for your continued help and support,
> -Ansel

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