[cairo] svg-mask matrix patch for review

[Kai-Uwe Behrmann]

Hello Behdad,

the attached files cover the test code, a Makefile.am diff and a 
reference png. The test behaves different for the patched and the 
unpatched git Cairo's.


kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org


Am 26.08.08, 14:43 -0400 schrieb Behdad Esfahbod:

> Hi Kai-Uwe,
> 
> Can you please also write a test case for the test suite that exposes the bug
> and the fix?
> 
> Thanks,
> 
> behdad
> 
> Kai-Uwe Behrmann wrote:
> > The expected behaviour for masking in Cairo is to set the mask according 
> > to the current active matrix and apply unchanged to a to be masked 
> > surface.
> > 
> > In SVG the mask element is bound to the masked object and thus the local 
> > matrix from that image object applies to the nested mask as well.
> > 
> > Attached is a small patch for substracting the matrix of a image
> > surface from the matrix of the mask to comply to Cairo's behaviour.
> > I did not test for other stuff like vectors or text and would expect this 
> > part is not completed.
> > 
> > After the patch masked images appear equal on __all__ types of 
> > output: PNG, PDF and SVG. I checked the SVG with rsvg, Inkscape and 
> > Mozilla and compared with a png viewer and Acroread for PDF output.
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