[Pixman] Plan to release final development version before stable branch

Oded Gabbay oded.gabbay at gmail.com
Sat Dec 12 10:37:20 PST 2015

On Sat, Dec 12, 2015 at 8:34 PM, Bill Spitzak <spitzak at gmail.com> wrote:
> On Fri, Dec 11, 2015 at 4:15 AM, Oded Gabbay <oded.gabbay at gmail.com> wrote:
>> On Thu, Dec 10, 2015 at 11:19 PM, Bill Spitzak <spitzak at gmail.com> wrote:
>> > Can you include my patches to fix the filtering? They have been posted
>> > for a
>> > long time now.
>> >
>> > The last patch makes GOOD/BEST use filtering for scaling images down.
>> > This
>> > matches the current Cairo behavior and would allow Cairo to use the
>> > pixman
>> > backend rather than doing an image fallback for any image scaling
>> > smaller
>> > than .75. It also contains a bunch of minor optimizaion and filter
>> > selection
>> > tweaks that makes the output somewhat better than current Cairo.
>> >
>> Hi Bill,
>> Unfortunately, I don't see anyone reviewed your patches, and from what
>> I heard, those are quite significant changes.
>> It's a shame you didn't bring this up when I did the first development
>> release 4 months ago. Then we had enough time to check and test it.
>> I'm quite hesitant of including such changes right before the final
>> development version, even with a review.
> I did send email on May 22, 2015, in response to your comments.

That's strange, because I only started working on pixman during June of 2015...

>> I suggest that you try to contact one of pixman's veterans (Soren,
>> Siarhei, Matt, Pekka, Ben) offline and ask them nicely to at least
>> skim over the patches and give a high-level opinion about the series.
> These were discussed with Soren before. He disagreed with my previous
> version because I changed to a single filter calculation rather than his
> pair of filters being convoluted. This version preserves the pair of
> filters, with some fixes of bugs that caused artifacts in the resulting
> filters. I'm sending email directly in case they are not reading the pixman
> list.

Could you send me those emails ?

>> Also, check if you need to rebase the patches against current pixman
>> and if so, maybe send the series again. It might stir up a discussion.
> The patches applied to the newest version without any conflicts and my test
> programs still work. I have resent them to the pixman mailing list.


>> I'm willing to review them in terms of correctness and code style, but
>> I'm not veteran enough in pixman to give an opinion on the underlying
>> changes (which is the most important issue).
> Anything would be great.
> I believe these work well and have been using them for a while. This would
> allow the removal of redundant code in Cairo, and would allow 2-pass
> filtering to be done at some point in the future, which would really improve
> pixman performance.
ok, I'll try to take a look next week or so.


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