[MapServer-dev] Does mapserver support GIF format for WMS / WMTS services?

Seth G sethg at geographika.co.uk
Fri Sep 8 06:01:35 PDT 2023

I think `WITH_GIF` is only used to read in GIF images (for symbols etc.)?

As Even wrote GDAL/GIF doesn't seem to work as an OUTPUTFORMAT. I get:

msDrawMap(): Image handling error. Failed to draw layer named 'countries'. msOGRFileNextShape(): OGR error. OGR GetNextFeature() error'd. Check logs

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On Fri, Sep 8, 2023, at 2:43 PM, Even Rouault wrote:
> Philippe,
> Le 08/09/2023 à 14:16, Philippe Ghesquiere via MapServer-dev a écrit :
>> Hi all,
>> I am a little bit confused with GIF support for WMS/WMTS services.
>> In several parts of the documentation, it is mentioned that GIF support is discarded with the end of the "GD library" support.
>> I noticed the compilation option in CMakelists.txt :
>> option(WITH_GIF "Enable GIF support (for PIXMAP loading)" ON)
>> I do not understand the "for PIXMAP loading" comment.
>> Anyway, our mapserver does not server WMS/WMTS tiles in GIF format.
>> So here are my few questions :
>>  • is GIF support enabled by default for WMS/WMTS services ?
> no
>>  • do I need to add the option : -DWITH_GIF=ON for cmake configuration ?
> only to load raster symbols in GIF format
>>  • do I need to add a specific mapserver configuration, like :
>>    NAME "GIF"
>>    MIMETYPE "image/GIF"
>>    EXTENSION "gif"
>> END
> I don't think that will work. The GDAL GIF driver already expects paletted data, not RGB.  And I don't think switching IMAGEMODE to PC256 would work since that support has effectively gone.
> I believe the only option to get paletted data is to use PNG8 with the AGG/PNG8 driver and MIMETYPE="image/png; mode=8bit"
> Even
>> Thanks for your help and advices
>> Philippe
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