Opened 12 years ago
Last modified 12 years ago
#4167 new defect
MapServer seems to always use GDAL driver with cascaded WMS (instead of AGG) — at Version 2
Reported by: | elzouavo | Owned by: | msogcbugs |
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Priority: | normal | Milestone: | |
Component: | WMS Client | Version: | 5.6 |
Severity: | normal | Keywords: | |
Cc: |
Description (last modified by )
Hi,
I have some troubles using AGG with cascaded WMS.
I have my first mapfile that exposes WMS layers (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 as WMS server): roads.map
I'm using MapServer 5.6.0 beta 3 on Debian (to avoid WFS requests issues with the folowing versions). But I have the same problem with 5.6.3. I advertise raster formats with "GetMap formats" 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 then requests my second mapfile using MapServer as WMS client), 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 NB : Sorry for my poor English...
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 ... 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" END END LAYER NAME "my_roads" ... CONNECTIONTYPE postgis ... END ... 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... ;-(
Change History (3)
by , 12 years ago
comment:1 by , 12 years ago
Component: | MapServer C Library → WMS Client |
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Owner: | changed from | to
comment:2 by , 12 years ago
Description: | modified (diff) |
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PNG with direct WMS access and an other with cascading access