[cairo] GSoC/scan converting rasteriser update

Behdad Esfahbod behdad at behdad.org
Wed Jun 18 15:44:23 PDT 2008

Hi Joonas,

Thanks for the update.  Your blog looks great!  Has got a perfect level
of details and awesome sense of humor!  I read all posts and have cloned
the tree.  Expect to check the code out later this week.

Now lets see how our other SoC students are gonna catch up.  hint
hint ;)



On Tue, 2008-06-17 at 22:31 +0300, M Joonas Pihlaja wrote:
> Hey cairo-l,
> I got friendly reminder from my mentor to keep you guys updated
> on the status of my GSoC project.  I guess he really meant "yo
> dude, you haven't made a peep even on the mailing list yet!", so
> to make up for lost time, I've bootstrapped a blog about it on
> http://people.freedesktop.org/~joonas/status-blog/.
> The work so far is available at
> git://people.freedesktop.org/~joonas/spans, and consists of a
> horizontal span container, and mono/analytic span generators.
> That's an independent code base that has nothing to do with cairo
> yet, so my plan for this week is to cairoise it and clean it up a
> little to get a slow and correct polygon rasteriser.
> In the slow and correct version I plan to punt on both span
> generation and compositing.  For span generation, I'm going to go
> via the tessellator, because the analytic rasteriser gets pixels
> with intersections slightly wrong.  I'll also punt on compositing
> spans and instead first rasterise an alpha mask of the polygon
> and then call pixman to do the actual tricky bits.  So yes, very
> slow, but hopefully "obviously" correct once done, at least in
> principle, yes?
> Cheers,
> Joonas
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