☔ Implement variation fonts

• Component: Text
• Status: NEW ---

[Myles C. Maxfield]

Implement variation fonts

[Michael Catanzaro]

Hey Myles! So all variation fonts tests are failing on GTK since r206839 "Put variation fonts work behind a compile-time flag" which added an XCode-specific build setting; the setting doesn't exist for any other WebKit ports, though, so it's off by default everywhere else. Is this desired? Judging from bug #162818 I guess this feature is intended to be enabled on macOS; if it doesn't require any platform-specific implementation then I'm sure other ports would like to match that, right? We should probably add it in WebKitFeatures.cmake at any rate?

In the meantime, I'm marking all tests expected to fail on GTK, against this bug (so please don't close this unless we either remove those expectations or open another bug).

[Michael Catanzaro]

(In reply to comment #1)
> Hey Myles! So all variation fonts tests are failing on GTK since r206839
> "Put variation fonts work behind a compile-time flag" which added an
> XCode-specific build setting

Well that's not true, only a few of them are failing:

animations/font-variation-settings-unlike.html
fast/text/variations/advances.html
fast/text/variations/exist.html
fast/text/variations/getComputedStyle.html

Also we have two timeouts, which are probably bad even if the option is off:

animations/font-variation-settings-order.html
animations/font-variation-settings.html

I'm skipping fast/text/variations, marking animations/font-variation-settings-unlike.html as expected fail, and marking the timeouts as expected timeouts, all against this bug. Feel free to move the expectations to different bug reports or whatever else.

[Myles C. Maxfield]

(In reply to comment #1)
> Hey Myles! So all variation fonts tests are failing on GTK since r206839
> "Put variation fonts work behind a compile-time flag" which added an
> XCode-specific build setting; the setting doesn't exist for any other WebKit
> ports, though, so it's off by default everywhere else. Is this desired?
> Judging from bug #162818 I guess this feature is intended to be enabled on
> macOS; if it doesn't require any platform-specific implementation then I'm
> sure other ports would like to match that, right? We should probably add it
> in WebKitFeatures.cmake at any rate?
> 
> In the meantime, I'm marking all tests expected to fail on GTK, against this
> bug (so please don't close this unless we either remove those expectations
> or open another bug).

Variation fonts support requires platform support. It doesn't seem to make any sense to me to turn on the feature in WebKit but not hook it up to the EFL/GTK platforms (which I don't know how to do). Of course, each port an make the decision of turning this feature on or not.

The timeouts are particularly worrisome. Do you know why they are happening?

[Myles C. Maxfield]

Clarification: for Cocoa-based ports, the platform support is hooked up, so it makes sense for it to be on by default there.

[Michael Catanzaro]

(In reply to comment #3) 
> Variation fonts support requires platform support. It doesn't seem to make
> any sense to me to turn on the feature in WebKit but not hook it up to the
> EFL/GTK platforms (which I don't know how to do). Of course, each port an
> make the decision of turning this feature on or not.

OK, then the status quo seems correct, though I think that non-Mac-specific build flags should probably always be added to WebKitFeatures.cmake (and just set to OFF), and also FeatureList.pm.

> The timeouts are particularly worrisome. Do you know why they are happening?

Nope.

[Miguel Gomez]

These two

animations/font-variations/font-variation-settings-order.html
animations/font-variations/font-variation-settings.html

are not timing out anymore since r207642. They are now failing with ImageOnlyFailure.

I'll update expectations accordingly.