[mapserver-dev] RE: [UMN_MAPSERVER-DEV] Performance transparency

[Hallgren, Johan]

Hello Thomas

It sounds really good, and I smiles when a read your reason to work:)

Have you seen any performance differences? I don't know if you have followed my question but the problem we had was that when the size of the image increased the performance decreased more than expected (when using transparency). We had a raster map in background and rendered a polygon layer on top. As you probably understand we need to see thru the polygons. We want to have the polygon layer semi transparent, like 40% transparent or so.

Do you think you work will affect us?

Regarding Steves question about how to trigger it. I always search for transparence because I understand what it means. If we should have a distinction because the use of the word to day (transparency) I would prefer opacity.

Best Regards
Johan

___________________________________


Johan Hallgren


Logica
Pelle Bergs backe 3
Box 1938, 791 19 Falun
Tel (och mobil): 023-547 46 (int: +46-2354746)
johan.hallgren at logica.com
http://www.logica.se

-----Original Message-----
From: mapserver-dev-bounces at lists.osgeo.org [mailto:mapserver-dev-bounces at lists.osgeo.org] On Behalf Of thomas bonfort
Sent: den 20 mars 2008 22:08
Cc: mapserver-dev at lists.osgeo.org
Subject: Re: [mapserver-dev] RE: [UMN_MAPSERVER-DEV] Performance transparency

On Thu, Mar 20, 2008 at 9:48 PM, Steve Lime <Steve.Lime at dnr.state.mn.us> wrote:
> I believe Thomas already has it working but I don't know that it is in SVN yet. It will only be supported for the AGG renderer  I think. There are certain caveats about it's use (for example it doesn't work well with certain types of linear data presentations. This should be in place for 5.2.
>
>  One question that remains is how to trigger it. I favor use of the opacity keyword as opposed to the specifying an alpha channel in a color.
>
>  Steve
>

will probably be working on this over the weekend (provided the crappy
weather announced here is true, I can't promise anything if not ;)
I'll keep in touch in the beginning of next week so folks who are
interested in this can have a test at it before the 5.2 release.

cheers,

--
Thomas Bonfort

Camptocamp France SAS
Savoie Technolac, BP 352
73377 Le Bourget du Lac, Cedex

Tel : +33 (0)4 79 26 57 97
thomas dot bonfort at camptocamp dot com
http://www.camptocamp.com
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