[MapServer-users] Mapserver>=8.0: Layer Composite Opacity

[Jeff McKenna]

Hi Dieter,

I also just used MS4W's PHP (PHP version 8.3.9) to call the setOpacity() 
function, to update the layer's opacity, such as:

   $oPolyLayer->setOpacity(40);

(see sample script at https://ms4w.com/trac/wiki/SWIGMapScriptOpacity )

-jeff




On 2024-08-07 11:38 a.m., Jeff McKenna via MapServer-users wrote:
> Hi Dieter,
> 
> It could be possible that your MapServer installation was compiled with 
> Pixman library support enabled in MapServer, which unfortunately causes 
> a known bug where opacity does not work (see 
> https://github.com/MapServer/MapServer/issues/5343 ).  I believe we 
> should completely remove Pixman support from MapServer in a future 
> release, as so many users hit this issue each year.
> 
> In other words, make sure that you set -DWITH_PIXMAN=0 when compiling 
> MapServer from source.
> 
> PS. I actually used the small mapfile included in that ticket, for 
> testing now with today's MapServer 8.3-dev on MS4W 5, on Windows, and 
> successfully generated a proper map image (with opacity) with map2img.
> 
> thanks,
> 
> -jeff
> 
> 
> 

-- 
Jeff McKenna
GatewayGeo: Developers of MS4W, & offering MapServer Consulting/Dev
co-founder of FOSS4G
http://gatewaygeo.com/