[MPEG-OTSPEC] Draft AHG report

[Hin-Tak Leung]

 Hi Vlad. Thanks for the update.
Firstly, a small correction - "braking changes" surely that is "breaking changes"?
I am reading claims of size-benefits of proposed changes quite carefully, and quite skeptical of them in general.
The claims about composite usage in hangul and CJK is really limited to optimal/stylistic usage scenarios with Hei/San styles, really, and perhaps put quite severe constraints on both the style (not plural) in heavily composite-oriented design based approach, and also the actual day-to-day design work-flow. Worst case: you see styles coming out looking like those from B-movies with Fu Manchu as the villain from the 60's. That reminds me of the work of a famous artist called Xu Bing - one of the things he is famous for, is writing English phrases/slogans in chinese-calligraphic-style composite glyphs. What it sounds like is the reverse - losing all the calligraphic tradition of the far east and recommending/forcing hangul/CJK into a San style.
The other size claim is about the possibility of sharing data between old glyf and new GLY2(?). otf tables have alignment and  checksum requirements, so that would mean contiguous-ness of the old subset, and possibly padding (and also a 1 to 3(?) byte padding break between old subset and new) complications. Some of the details are certainly behind closed-source implementations, but I believe there are non-overlapping-ness checks in various font checking schemes / tools, both stand-alone and built into OSes too: ie valid tables are taken as non-overlapping, and overlapping tables indicate broken fonts. That will need to change/specified/excepted if glyf and GLYX/GLY2(?) is to share content.
I can continue my rant on size claims regarding SVG vs COLRv1, and quadratic vs cubic too. Poorly written SVG is poor, and qudratics not using implicit on-curves points are larger. Claims about being better than poor SVG and better than poor quadratics, size-wise, are meaningless.
So I'd prefer to see those size-related claims removed, if not heavily qualified/caveated.
    On Sunday, 15 October 2023 at 11:06:57 BST, Vladimir Levantovsky <vladimir.levantovsky at gmail.com> wrote:  
 
 Dear all,

Please see attached the text of the AHG report I plan to present tomorrow during the opening SC29/WG meeting Plenary. This report is based on the AHG meeting summaries that were previously distributed on this list.If you have any comments, please send them by the end of the day today.
Thank you,Vladimir
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