Re: Hosted source format?

Hi John,

On 2024-07-11 19:03, John Hudson wrote:
> At that time, he presumed the hosted source format for IFT would be an 
> uncompressed TTF or OTF file, but I pointed out that license 
> agreements might be worded in such a way that webfonts need to be 
> /hosted/ as WOFF2 or WOFF. Garret thought it should be possible for 
> the hosted source font to be pre-compressed as WOFF2 or WOFF, then 
> decompressed, subsetted, and recompressed as WOFF2 for delivery. I 
> wanted to check on the status of this query, and wasn’t able to find a 
> definite answer in the working draft text.

That used to be the case, in particular for the old range-request method.

With the new draft, the incremental version of the font is a regular 
sfnt font with two extra tables holding the links to the patches. This 
means that WOFF compression will yield a bit-identical font; and WOFF2 
compression can be used, and will yield a functionally identical font, 
provided certain conditions are met when creating the incremental version:
https://www.w3.org/TR/IFT/#ift-and-woff2

-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media