This should be the last code backout for this. merging this branch
should get us back to the way we were (+ additional code changes for
later changes) as fasr as the unused unboxed code is concerned.
This stub is added because websites insist on considering this
very hardware-dependent and O.S.-variable low-level font-control
as a "critical feature" which it isn't as there is 0 guarantee
that font variation settings are supported or honored by any
operating system used by the client.
On top this is a WD status feature that sites shouldn't be using, and
the feature itself is strongly discouraged for use in favor of standard
CSS font manipulation keywords like `font-weight`.
This gets rid of platform-dependent hard-coded defaults, but keeps
build-time blocking if there is no GL provider (in which case layers
acceleration almost certainly won't work because it needs a GL
compositor and would likely crash without)
New prefs are
- layers.acceleration.enabled to enable HWA
- layers.acceleration.force to force it enabled (requires .enabled to be
set as well)
This is the platform part of this issue. The rest will be front-end work
(Preference UI integration and pref migration)
The indicated BZ bug was resolved in Gecko 50, and could have already
been enabled before (since it returns a promise as-required).
With the rest of promise-based media implemented it makes no sense to
keep this disabled on production.
Considering the one exception this was still enabled for on all versions
of Firefox since 45 until our fork point is no longer applicable.
This resolves#1353
This should do it for all the commits to files I changed, but while I'm in here I could probably go ahead and turn ALL the singular if defined statements into ifdef statements by using grep/find on the tree. On the other hand, perhaps we should do that as a separate issue so that this doesn't become a case of scope creep.
https://bugzilla.mozilla.org/show_bug.cgi?id=1350355
u_int32_t is not an stdint.h type. Windows already requires this, Solaris needs it too. If someone has a nit with this approach, the alternatives include:
1. Just replacing every instance of u_int32_t with uint32_t.
2. Including <sys/types.h> for Solaris only, which does define this.
3. Changing the original ifdef to be WIN32 || XP_SOLARIS
But it really doesn't matter how you solve this problem, all of the approaches are functionally equivalent, and this one has been used in Firefox since version 55. As far as I can tell, all it does is apply a fix that was being done for Windows already to any platform that needs it.
