[mapserver-dev] Supporting runtime substitution for the MASK layer parameter

Seth G sethg at geographika.co.uk
Wed Sep 29 13:20:58 PDT 2021

Hi Matthew,

I can't see any negatives about implementing that feature.

Have a look at layerSubstituteString at https://github.com/MapServer/MapServer/blob/1c14821bc4c6fc10e966fd05230ad71c05817c7d/mapfile.c#L6710

See https://github.com/MapServer/MapServer/blob/main/msautotest/renderers/mask_opacity.map for an existing test that makes use of a MASK and https://github.com/MapServer/MapServer/blob/main/msautotest/query/rfc62.map for a test using runtime subs. 


twitter: @geographika

On Wed, Sep 29, 2021, at 9:55 PM, Matthew Geiger wrote:
> Hello! I maintain a large mapserver-based project that makes heavy use of the 'mask' layer parameter. I'm wondering if it's possible or desired to enable this parameter for runtime substitution? If so, I'd be interested in working on this feature, and would welcome any guidance.
> Thanks all! Mapserver is awesome!
> -- 
> Matthew Geiger
> Software Developer
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