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

[Philippe Ghesquiere]

Thanks Even & Seth,

I will give it a try

On Fri, Sep 8, 2023 at 3:02 PM Seth G <sethg at geographika.co.uk> wrote:

> 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
>
>
> --
> web:https://geographika.net & https://mapserverstudio.net
> twitter: @geographika
>
> 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 :
>    OUTPUTFORMAT
>       NAME "GIF"
>       DRIVER GDAL/GIF
>       MIMETYPE "image/GIF"
>       IMAGEMODE RGB
>       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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