[cairo] SVG element <use> clips negative coordinates

Behdad Esfahbod behdad at behdad.org
Thu Feb 26 18:14:37 PST 2015

Or, I might be wrong, in which case Firefox and Chrome need to be fixed.

Here's the relevant parts of the spec, for spec lawyers:



On 15-02-26 06:10 PM, Behdad Esfahbod wrote:
> Howdy!
> Currently cairo-svg uses the <use> element to render glyphs.  Such glyphs have
> their origin at baseline-left, which is typical in text rendering.  This works
> fine with librsvg.
> However, as observed in Firefox and Chrome, and hidden in the spec, the <use>
> element clips its content to a rectangle.  When width and height are left
> unset, they expand to 100%, the result being that in a line like this:
>   <use xlink:href="#glyph4-11" x="50" y="50"/>
> only the first quadrant is rendered.
> Test image attached.
> Federico: librsvg needs to be fixed to do the (stupid) clipping...
> Cheers,


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