Possible bug when calculating the size of external legend graphics

[MathiasLuecker]

When external graphics are configured as "l:LegendGraphic" for a layer, they are returned with the wrong size when retrieved via GetLegendGraphic. The incorrect size is also listed in the capabilities.

Example: https://qs-geodienste.hamburg.de/HH_WMS_KitaEinrichtung?service=WMS&request=GetLegendGraphic&version=1.3.0&format=image/png&layer=KitaEinrichtungen

When providing the correct width and height the legend has the correct dimension:
https://qs-geodienste.hamburg.de/HH_WMS_KitaEinrichtung?service=WMS&request=GetLegendGraphic&version=1.3.0&format=image/png&layer=KitaEinrichtungen&WIDTH=330&HEIGHT=205

We observed this behaviour in version 3.6.10. In version 3.6.5, however, it still works. Could this be related to this feature? #1912

Many thanks and best regards from Hamburg

[dstenger]

Thank you for reporting.

Indeed, the capabilities state this:

        <Style>
          <Name>default</Name>
          <Title>default</Title>
          <LegendURL width="32" height="648">
            <Format>image/png</Format>
            <OnlineResource xlink:type="simple" xlink:href="https://qs-geodienste.hamburg.de/HH_WMS_KitaEinrichtung?request=GetLegendGraphic&version=1.3.0&service=WMS&layer=KitaEinrichtungen_Details&style=KitaEinrichtungen_Details&format=image/png"/>
          </LegendURL>
        </Style>

This is documented there: <LegendURL width="32" height="648">

Those values are used as the default values for WIDTH and HEIGHT. https://qs-geodienste.hamburg.de/HH_WMS_KitaEinrichtung?service=WMS&request=GetLegendGraphic&version=1.3.0&format=image/png&layer=KitaEinrichtungen&WIDTH=32&HEIGHT=648 returns the same as the request without WIDTH and HEIGHT values.

Thus, we have to analyze why the capabilities use wrong values for width and height. I agree that there might be a connection to #1912.

[tfr42]

@MathiasLuecker To get this fixed it would be very helpful to have a complete workspace configuration which could be used for a reproducer. See https://github.com/deegree/deegree3/wiki/Bug-Report-writing-Guidelines for more information.

[MathiasLuecker]

Steps to Reproduce
start test workspace and call /deegree-webservices/services/wms_test?service=WMS&request=GetLegendGraphic&version=1.3.0&format=image/png&layer=test
or /deegree-webservices/services/wms_test?service=WMS&request=GetCapabilities&version=1.3.0
Actual behaviour
The returned image of the GetLegendGraphic Request is 32x27 pixel these values are also noted in the Capabilities
expected behaviour
The image file, which is located in the workspace and is included as legend graphic, is 197x217 pixel in size, so the output legend graphic should also be this size
deegree version
3.6.10
Additional information
Tested in docker runtime with tomcat 10.1 and JDK 17 base image
complete deegree workspace to reproduce
test_workspace.zip