Re: Optimization question

[Dov Grobgeld <dov imagic weizmann ac il>]

Since you are painting numbers, the fastest would be to do a prerendering
of all the numbers and store these in GdkPixbuf's in memory. The conversion
of an altitude reading to a number to display would then just need to
use a series of gdk_pixbuf_copy_area() to draw each of the numbers.
Using any kind of external file representation like png, is just a waste
of time.

You can do the same thing with GdkImlib images, btw, that are currently
required for the canvas. You don't need to destroy your objects btw. A
simple canvas_image->set("image"->$image) repaints the image, if I'm
not mistaken.

Regards,
Dov

On Mon, Feb 04, 2002 at 01:59:02PM -0500, Daniel Carrera wrote:
> Hello,
> I'm working on a space station simulation and I need some optimization
> advice.  The bottleneck is definitely the altitude reading.  It consists
> of a 6-digit number that is rendered to the screen using images (PNGs).
> To create the feeling of real time, this number is updated every 10
> milliseconds.
>
> I definitely want to use images for the simulation.  It is intended for
> preschoolers so it should look nice.
>
> I have a few questions:
> 1)  Is there any particular format that is rendered faster than the
> others?  I am using PNGs right now.  Should I use something else?
>
> 2)  How does Gtk manage memory?  If one object is hidden by another, is
> the first still in memory?  I ask because currently the altitude reading
> belongs to a canvas group.  Every time that the altitude is updated (every
> 10 milliseconds) I destroy the group and build an entirely new one.
>
>     This must consume a lot of CPU power.  I thought that I might just
> draw the new number on top each time.  However, if the old ones will
> remain in memory, this approach would suck the entire system's memory very
> quickly.
>
>
> Any advice on this matter would be much appreciated.
>
> Thanks in advance,
> Daniel.
>
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Dov Grobgeld                        | Email: dov orbotech com      /+  \  PCB
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