Re: Integer pixel operations for gtk+?

["Matt Hoosier" <matt hoosier gmail com>]

I don't have the work on-hand any more, but a colleague of mine tried
just this a few months ago.

The results (according to gtk-theme-torturer exercising a theme which
used pixmaps) were somewhat disappointment. If I remember correctly,
there is currently only a small bit of non-integer math remaining in
pixops.c (calculation of the filter, or something like that). At the
time, our speculation was that the overhead to cast the floating point
inputs into fixed-point was dominating any savings to be had from
avoiding this small amount of software FP emulation.

On 2/10/07, Koen Kooi <koen dominion kabel utwente nl> wrote:
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> [also posted to openmoko-devel, but I'm too stupid to figure out how to mix&match gmane
> nntp and regular email]
>
>
> Hi,
>
> A few years ago Phil Blundell made patch[1] to speed up pixel operations (scale, blend,
> rotate, etc) a lot for systems without a floatingpoint unit. Years of gtk+ developer
> desinterest have let the patch bitrot a fair deal.
> In order to get the ball rolling again I updated the autotools bits in the patch and
> adjusted the indices so it applies to the .c files as well. What's left is updating the
> functions and their arguments to catch up with several years worth of development.
> This patch would speed up the GUI on openmoko based systems a lot, since it's using quite
> a lot if pixmaps.
>
> I've heard that the openmoko team also tried sapwood, but couldn't get it to work properly
> because it's a) entirely undocumented and b) only supports 1 bit alpha
>
> Any heroes that want to give a shot at updating the pixops patch?
>
> regards,
>
> Koen
>
> [1] http://bugzilla.gnome.org/show_bug.cgi?id=90621
>
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