[maemo-developers] [maemo-developers] 2D Library, Vector Library or similar.

[From: koos vriezen]

2006/11/21, Carl Worth <cworth at cworth.org>:
> On Tue, 21 Nov 2006 10:34:30 +0100, Beth wrote:
> > Hi Xan, I will try to get two implementations working, one with a
> > GtkDrawingArea and other with cairo.
>
> Those aren't mutually-exclusive options. The best way to draw on a
> GtkDrawingArea (in my opinion) is to do that with cairo.
>
> See, for example the second half of this tutorial:
>
> http://www.gnomejournal.org/article/34/writing-a-widget-using-cairo-and-gtk28
>
> If you just write a function to handle the expose event of your
> GtkDrawingArea then you can use cairo to draw in it as much as you'd
> like.
>
> > Sure that I will be here making a bit of noise (jeje maybe boring
> > noise but ...)
>
> I'm the cairo maintainer, and I recently subscribed to this mailing
> list. We're currently working on improving the cairo performance as
> much as possible, (and many of the people actively working on it are
> doing it with a focus on embedded devices such as the 770).
>
> So please give it a try, and if things are slower than you'd like or
> expect, let us know so we can look at those cases that you are
> hitting.

Sorry for my stupidity on this matter, but I have two questions.

In another thread, about gnash, they mentioned moving to agg for its
lightweightness. How do these two compare? Eg. do you think they could
have moved to cairo as well?

Secondly, given the success for cairo, I wondered  about the scarce
documentation on the net. Eg. can cairo deal with images, like suppose
I have a surface w/ a blue rectangle and a png surface, an animation
that moves the png from top-left to bottom-right of the rectangle, say
opaqueness of 80% and double scaled. Can one do that in cairo, and
what are the considerations concerning flickering (or how are the
syncing with the display done)? Or where to find documentation about
this.
Also the API docs mentions it's incomplete. Are not all API's noted,
or are the explanation not complete?

Tia,
Koos

> -Carl
> --
> cworth at redhat.com
>
>
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