[MPEG-OTSPEC] Defining the text shaping working group’s scope

[suzuki toshiya]

Dear AHG Convenor,

Maybe it's too late to ask such question, but please let me ask about the coverage of "Text Shaping". The first web page suggested by Google for "Text Shaping" is the document of harfbuzz library. I understand "Text Shaping" does the selection or extraction of the graphic data for an appropriate glyph, or grapheme, or ligature, or cluster by a specified single font instance, from the string of the coded character set. It does not assume the input is marked-up text like HTML.

I guess, "Text Shaping" is a part of "Text Layout", but some of "Text Layout" might be out of the scope of "Text Shaping". For example, the vertical layout of Japanese text, like,

On 2020/03/26 4:56, 'Levantovsky, Vladimir' vladimir.levantovsky at monotype.com [mpeg-OTspec] wrote:
> 3.       Compatibility problem with ‘vert’
> The discussion linked from https://lists.w3.org/Archives/Public/www-archive/2019Dec/<https://jpn01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.w3.org%2FArchives%2FPublic%2Fwww-archive%2F2019Dec%2F&data=02%7C01%7Cmpsuzuki%40hiroshima-u.ac.jp%7Cb7c64ddd8e5e42d1d7ae08d7d0f6af90%7Cc40454ddb2634926868d8e12640d3750%7C1%7C1%7C637207630239695678&sdata=wPI25fu%2FEiHrhkIAFGIU893TUG1OVlD6DxVWrgI2tCE%3D&reserved=0> seem to be specific to a particular behavior of existing version of Adobe InDesign application and Adobe Japanese font set. Considering the recent changes introduced by ISO/IEC 14496-22:2019/AMD1, I am not sure how much more (if anything) need to be done on the spec side. I do realize that both applications and fonts need to be updated to be compliant with new feature descriptions.

is covered by "Text Shaping" ? I believe, "Text Layout" covers it, but I'm not sure whether "Text Shaping" covers it.

Regards,
mpsuzuki