[WebKit] claims to support SVG but doesn't

[waddlesplash]

NOTE: I am posting this here because ​http://webpositive.haiku-os.org/ is down.

Example: open ​http://defi.ant.ly/2011/06/inline-svg-experiment/ and scroll down. Where it says "Free Tomatoes" with a bunch of dates, there is supposed to be an inline SVG graph. Web+ shows nothing

If you go to ​http://html5test.com, "SVG in text/html" has "Yes" on it. CSS3 gradients are also claimed to be supported (and attempt to be drawn, see background on ​http://html5test.com) but eat time to render and are not displayed properly. Perhaps it's time that WebKit for Haiku gets an update?

[richienyhus]

AFAIK ​http://webpositive.haiku-os.org/ is meant to be in read only/archival mode anyway.

[waddlesplash]

SVG works in some places, but the above inline SVG link doesn't. I wonder why...?

[pulkomandy]

I think they work, but our drawing code is missing so much stuff (mostly in the management of transformations) that the SVG renders at the wrong place, possibly out of screen.

[X512]

It's a good chance to improve native drawing API to support SVG rendering, because it can be used for other applications too.

[pulkomandy]

Some more details on what's missing: WebKit SVG drawing make use of affine transforms to translate the SVG drawing to the right place on the page. For this to work, we need to implement GraphicsContext::concatCTM in ​https://github.com/haiku/webkit/blob/rebased/Source/WebCore/platform/graphics/haiku/GraphicsContextHaiku.cpp.

This in turn requires arbitrary transformations support in BView, likely using the existing BAffineTransform class for the API. On app_server side, this can be converted into an agg matrix.

We still need to defie how this should be interacting with the existing methods to set the view scale and offset. These could be applied before or after the matrix, or they could modify the matrix instead of working separately. Quick tests with concatCTM also show some unexpected results with regard to clipping. I don't know if an actual implementation on BView side would have similar problems.

[pulkomandy]

(In #10721) Duplicate indeed, these are SVG images and we still lack some support for that.

[pulkomandy]

Some progress here: now the graph renders properly, but the text (legends on the axes, etc) went missing...

[pulkomandy]

This page is not online anymore. Closing this ticket since we have at least some SVG support, please open separate issues for any rendering glitch you find.