[webkit-dev] FYI: sub-pixel layout landing soon

Levi Weintraub leviw at google.com
Mon Apr 23 17:41:29 PDT 2012

Given the concerns brought up, we'll be adding an ENABLE_SUBPIXEL_LAYOUT
flag that will default to on. Turning this off will continue to use
FractionalLayoutUnits, but the fraction will switch to 1/1 from the default
of 1/60. This should be ready in the near future, and we'll provide another
heads-up when we're again ready to land.


On Mon, Apr 23, 2012 at 2:55 PM, Maciej Stachowiak <mjs at apple.com> wrote:

> If it's a global switch that ports can't opt out of, then we have to do
> this at a time when it wouldn't disrupt anyone's release cycle. Let's say
> hypothetically a vendor was going to branch from trunk and ship in two
> weeks (not actually the case for us, but just to make it an extreme
> example). It would be insane for them to take this change. So we need one
> of the following:
> (1) It needs to be compile-time switchable so that vendors who are close
> to shipping can turn it on to mitigate risk without having to roll back to
> earlier on trunk.
>     OR
> (2) We need up-front buy-in from all vendors who ship from the open source
> tree that now is a reasonable time for them to make such a major change.
> Regards,
> Maciej
> On Apr 23, 2012, at 2:48 PM, Levi Weintraub wrote:
> Supporting this would be very logistically intensive and error prone.
> Beyond huge test expectation differences, hacking on the rendering engine
> could easily result in bugs in one path or the other.
> -Levi
> On Mon, Apr 23, 2012 at 2:31 PM, Adele Peterson <adele at apple.com> wrote:
>> Is there an if-def ports can use if they don't want this on by default?
>>  - Adele
>> On Apr 23, 2012, at 2:15 PM, Levi Weintraub wrote:
>> WebKittens and Unlucky Sheriffs
>> We intend to flip the switch on sub-pixel layout tomorrow morning PST. We
>> apologize in advance for any breakages. See
>> https://trac.webkit.org/wiki/LayoutUnit and http://webkit.org/b/60318for reference, and feel free to contact Emil (eae) or me (leviw) with any
>> questions.
>> Happy zooming!
>> -Emil and Levi
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