Bug 12883 – Disable experimental SVG features

• Component: SVG
• Status: RESOLVED FIXED

[Maciej Stachowiak]

As part of the current WebKit stabilization effort, we'd like to disable some of the more experimental SVG features, including:

- SVG in images
- Animation
- Filters
- <use>
- <foreignObject>

I would suggest adding a single define SVG_ENABLE_EXPERIMENTAL_FEATURES, to guard them all, so it is still possible to test them for those who want to.

[Maciej Stachowiak]

<rdar://problem/5021698>

[Maciej Stachowiak]

Once this is resolved, bugs with these features will no longer be P1.

[Kyle Rove]

How experimental is <use> support? A number of SVGs use it and it would be a shame to have it miss the boat.

[Antoine Quint]

Nikolas's assesment of the situation when it comes to <use> in http://lists.macosforge.org/pipermail/webkit-dev/2007-February/001683.html leads me to think that <use> is quite testable and supported well enough to make the cut as a stable feature. Given the high value of this feature and how widely used it is in SVG content out there, I sincerely hope it's not marked as experimental. 

[Maciej Stachowiak]

My plan is to disable <use> for now with the other bleeding-edge features. If someone wants to do extra testing for it, we can reconsider and flip the switch back at some point.

[Maciej Stachowiak]

Created attachment 13378 [details]
patch to add ENABLE_SVG_EXPERIMENTAL_FEATURES define

This patch doesn't include the changes to numerous SVG test cases that result from it, I would land those with the patch. However, we may want a buildbot with experimental features on so these don't stop getting regression testing.

[Maciej Stachowiak]

The patch also reworks how optional features in general are handled, so now the code says things like:

#if ENABLE(XPATH)

instead of:

#ifdef XPATH_SUPPORT

[Lars Knoll]

Comment on attachment 13378 [details]
patch to add ENABLE_SVG_EXPERIMENTAL_FEATURES define

-    print "#ifdef SVG_SUPPORT\n";
+    print "#if EABLE(SVG)\n";

should be ENABLE.

The SVG filters in platform/graphics/svg should not get compiled in.

With these two changes it's r=me.

[Maciej Stachowiak]

Landed (adjusted for some of Lars's comments).