Hi,
I have some troubles using AGG with cascaded WMS.
I have my first mapfile that exposes WMS layers (MapServer
<http://trac.osgeo.org/mapserver/wiki/MapServer> is used as a WMS server
and a WMS client): refs.map
I have a second mapfile that contains a Postgis layer (this mapfile uses
only MapServer <http://trac.osgeo.org/mapserver/wiki/MapServer> as WMS
server): roads.map
I'm using MapServer <http://trac.osgeo.org/mapserver/wiki/MapServer>
5.6.0 beta 3 on Debian (to avoid WFS requests issues with the following
versions cf. http://trac.osgeo.org/mapserver/ticket/4073).
I advertise raster formats with "wms_getmap_formatlist". I define
image/png to use AGG driver.
I can get nice PNG with AGG when I request directly my second mapfile
roads.map (using mapserver only as WMS server).
But if I request my first mapfile refs.map (that requests my second
mapfile using MapServer <http://trac.osgeo.org/mapserver/wiki/MapServer>
as WMS client. This is the WMS cascade), I get PNG with bad aliasing
(AGG does not seem to be used!).
I looked at the mapserv.log (for the WMS/GetMap that requests the
cascaded WMS) and I saw : "msDrawGDAL(): red,green,blue,alpha bands =
1,2,3,4"
Does "msDrawGDAL" meen that DGAL driver is used instead of AGG driver ?
Thanks for your reply.
Laurent
An extract of my first mapfile (refs.map): "MAP ...
OUTPUTFORMAT
NAME "PNG"
DRIVER "AGG/PNG"
MIMETYPE "image/png"
IMAGEMODE RGBA
TRANSPARENT ON
END
...
WEB
...
METADATA
...
"wms_getmap_formatlist" "image/png,image/jpg,image/jpeg"
END
END
LAYER
NAME "my_layer" ... CONNECTIONTYPE WMS
" http://my_domain/cgi-bin/mapserv?map=/my_path/roads.map";
...
METADATA
"wms_name" "my_roads"
"wms_server_version" "1.1.1"
"wms_format" "image/png"
...
END
END ...
An extract of my second mapfile (roads.map) : MAP ...
OUTPUTFORMAT
NAME "PNG"
DRIVER "AGG/PNG"
MIMETYPE "image/png"
IMAGEMODE RGBA
TRANSPARENT ON
END...
WEB
METADATA
...
"wms_getmap_formatlist" "image/png,image/jpg,image/jpeg"
END
END
LAYER
NAME "my_roads" ... CONNECTIONTYPE postgis
...
END
I'm not sure that this behavior should be different with mapserver 6.0...
NB: I've already post this message on Tue, 27 Apr 2010 in the mailing
list, but no reply... ;-(
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