Bug 279050 – SVG text path can't render Arabic

• Component: Text
• Status: NEW

[Ebrahim Byagowi]

Created attachment 472413 [details]
textpath text rendering is broken

This is akin to https://issues.chromium.org/issues/40366122

Compare the following to Chrome and Firefox,

data:image/svg+xml;charset=utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="400" height="400"> <text x="100" y="100" font-size="28">سلام</text> <path fill="transparent" id="f" d="m100 200 L 200 200Z"/> <text font-size="28"> <textPath xlink:href="%23f">سلام</textPath> </text> </svg>

Expected:
To all look the same

Actual:
Safari text rendering for RTL text is broken

[alan]

I haven't look at the blink issue (thank you for linking to it) but I bet this is a bug in our legacy inline layout which is what svg text rendering still based on. We are in the middle of moving svg text (layout and) rendering over on top of IFC. Hopefully this progresses as well -though I don't want to discourage anyone from giving a shot to this.

[Radar WebKit Bug Importer]

<rdar://problem/135661498>

[Ahmad Saleem]

In Blink, it was fixed with SVG Text Layout re-write similar to their LayoutNG, so it might be something definitely broken in our SVG Text rendering code relying on old Legacy Layout code.