[cairo] Use /Interpolate for PS?

[Chris Wilson]

On Sat, 2008-09-06 at 07:08 +0930, Adrian Johnson wrote:
> Carl noticed that we were not setting the /Interpolate flag shortly 
> before 1.6 was released. I wrote a patch[1] to fix this however there 
> were some issues. Ghostscript, acroread, and poppler did not render the 
> filter-bilinear-extents test the same. Carl suggested we revisit this 
> after 1.6 but I never did get around to finishing it.
> 
> [1] 
> http://gitweb.freedesktop.org/?p=users/ajohnson/cairo.git;a=shortlog;h=image-interpolation 

That's understandable. I don't think we should worry about how external
renderers handle a test that even cairo/pixman fails. So how about
pushing? :-) But before you do, you should remove the duplicate entry
for /Interpolate from pdf - the definition in IMAGE_DICTIONARY should
take just %s (as opposed to true).

Having achieved my original goal (to be able to run the cairo test suite
faster, faithfully and with near-idempotence :-) for my minimal PS
interpreter (plug:
http://gitweb.freedesktop.org/?p=users/ickle/micro-gs;a=summary), I've
been very impressed by cairo and your hard work on the PS/PDF backends.
>From that point of view, getting snapshot-cow would do wonders for the
file size and processing speed of the tests. Thanks in advance!
-- 
Chris Wilson