[HarfBuzz] Cluster question (Was Cluster soap box time)
ansel at copperspice.com
Fri Dec 14 04:05:19 UTC 2018
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 <mailto: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 <mailto: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?
Thanks so much for your continued help and support,
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