Re: Cairo rendering story

I wrote:
> - Temporary surfaces are clipped at the transformed bounding box
>   as explained above. This is far from ideal. However, it's not clear
>   to me what the right thing is here - what result should rendering
>   parts of the SVG that lie outside its viewBox give?

I believe [1] answers that question. It says,

# When an outermost SVG 'svg' element is stand-alone or embedded inline
# within a parent XML grammar which does not use CSS layout
# [CSS2-LAYOUT] or XSL formatting [XSL], the 'overflow' property on the
# outermost 'svg' element is ignored for the purposes of visual
# rendering and the initial clipping path is set to the bounds of the
# initial viewport.

which I believe means that librsvg should clip the SVG at its viewport,
and also means that the bounding box logic is sound.

I'll attach a patch that does the clipping (tested against the
testsuite). It applies on top of the patches for #500787 [2].

enjoy,

Bertram

[1] http://www.w3.org/TR/SVG11/masking.html#OverflowProperty
[2] http://bugzilla.gnome.org/show_bug.cgi?id=500787

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