[Webkit-unassigned] [Bug 70025] Merge CSS and SVG 2D Transforms according to FX 2D Transforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70025





--- Comment #8 from Raul Hudea <rhudea at adobe.com>  2011-10-14 05:01:27 PST ---
(In reply to comment #7)
> (In reply to comment #6)
> > (In reply to comment #5)
> > > I'd handle it like in HTML when HW acceleration is disabled. Means Ignore z-value in origin and transform 3dtransforms to 2dtransforms. Origin attribute will be supported in SVG 2.0.
> > 
> > I'm not very keen on this. I'd prefer to just ignore the property value, because it allows people to author their CSS in a manner that supports a fallback. In the future we'll support 3d in SVG, but for now people could write:
> > 
> > transform: scale(2) rotate(10deg);
> > transform: scale(2) rotateY(10deg);
> > 
> > This way they still get to control the effect when 3d is not available. Also, flattened 3d transforms look horrible :)
> Sure, but it would help in the meantime. I don't think that you want to deny 3D code in -webkit-transform
> for SVG if we will support it later anyway.

I'm also inclined to agree with supporting the flattened 3d transform in SVG, because they will also exist when hw acceleration is disabled.

> 
> > 
> > > 
> > > Just another note: The origin default value differs between HTML and SVG. For SVG it needs to be (0%,0%) to the bounding box.
> > 
> > Do we have to worry about that yet? Only when SVG supports the transform-origin property - then we'll need code to test whether it is in SVG or CSS.
> 
> I'm not sure. But I think I can remember that it was a problem. IIRC you had to pass the you bounding box at some point and that is used to calculate the origin for the transform. I definitely didn't thought about implementing transform-origin property at this time. Sadly I don't find my patch where I enabled CSS transforms in parallel to SVGTransforms. I'll search it later again.

I was just looking at this and the bounding box is needed when transform-origin is percent-based.

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