[cairo] Test programs extension

[Peter Weilbacher (Mozilla)]

On Wed, 06 Dec 2006 15:47:56 -0800, Carl Worth wrote:

> > I still have to figure out which of the tests actually make sense on
> > OS/2 but I guess most of them should...
> 
> I would hope you would test everything. As for the possibility of
> results being slightly different, you can provide backend-specific
> reference images. For example, the SVG backend sometimes overrides the
> default reference images such as:
> 
> 	text-pattern-ref.png
> 	text-pattern-rgb24-ref.png
> 
> with things like:
> 
> 	text-pattern-svg-argb32-ref.png
> 	text-pattern-svg-rgb24-ref.png

OK, thanks for the hint. Let me see how far I get.

> Meanwhile, we're in the process of integrating perceptualdiff which we
> hope will let us largely eliminate the need for backend-specific
> reference images. I'll have more on that shortly I hope.

Perhaps I should postpone work on reference images until then. :-)

   Peter.