[cairo] Automated testing of Cairo

Behdad Esfahbod behdad at behdad.org
Thu Aug 10 13:49:18 PDT 2006

On Thu, 2006-08-10 at 09:50 -0400, Carl Worth wrote:
> 6) The only current failure I see that isn't an obvious false positive
>    like those described above is the failure of
>    ft-text-vertical-layout which can be seen here:
>         http://crucible.osdl.org/runs/1466/test_output/cairo-test/nfs11/test/
>    This is a failure that's hitting the image backend, which is the
>    worst kind since there's no chance of a false positive being
>    introduced by some external conversion tool like with PDF, PS, and
>    SVG. Some false positives do hit the image backend because of a
>    missing font, (Bitstream Vera is about the only thing we use I
>    think), or perhaps a freetype-dependency. But usually a problem
>    like that will manifest itself as failures in every text-using
>    test. So I'm not sure what might be happening here. Again, it would
>    help to know the configuration of this machine.

That test is the only test that uses text in ways other than TrueType
subsetting.  The blue letters are done using cairo_text_path, and the
black ones using cairo_show_text, and since it's vertical, subsetting is
disabled.  No idea what causes this huge difference here.  FreeType
version is most interesting.


"Commandment Three says Do Not Kill, Amendment Two says Blood Will Spill"
        -- Dan Bern, "New American Language"

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