QGIS Server GetPrint: HIGHLIGHT_GEOM is not printed if map layers are configured to follow a map theme

[jgrocha]

Describe the bug

The HIGHLIGHT_GEOM is handy to print some additional geometry on top of an existing layout.

If the user chooses to "follow a map theme", in the map properties, the additional geometry is not printed. The layers printed are the ones on the theme, as expected, but not the HIGHLIGHT_GEOM.

In my use case, I want to provide always the same layers to be printed (a set of official layers) plus the geometry (the parcel) edited by the user on the web.

This can be considered a feature request.

How to Reproduce

Using two almost identical layouts (one the "follow a map theme" set and the other not) and issue a GetPrint request with an additional geometry.

QGIS and OS versions

QGIS Master

[elpaso]

please attach a project and data to reproduce.

[jgrocha]

Test project

I've created a very simple project with two layers and two layouts. The project is inside the same geopackage.

severdovouga.gpkg.zip

Capabilities

The geopackage should be stored some where on the server, where QGIS Server can have access.

http://qgis.demo/cgi-bin/qgis_mapserv.fcgi?MAP=geopackage:/home/qgis/projects/severdovouga.gpkg?projectName=highlight&request=GetCapabilities&service=WMS

Requests

To test QGIS Server, we issue two GetPrint requests, both adding an highlight geometry, that should appear in both outputs.

The difference between the two reuests are hthe layout configuration. One has the layers locaked to a spcific theme, while the other doesn't.

Request (Layout 1 copy layout has "Follow theme" selected)

This request fails to show the highlight on the output.

curl 'http://qgis.demo/cgi-bin/qgis_mapserv.fcgi' -H 'Content-Type: image/png' --data-binary 'MAP=geopackage:/home/qgis/projects/severdovouga.gpkg%3FprojectName=highlight&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetPrint&FORMAT=png&TRANSPARENT=true&TEMPLATE=Layout 1 copy&DPI=400&SRS=EPSG:3763&map0:extent=-16229.391033824511,120835.22371531081,-15816.92146617551,121100.47745656419&LAYERS=severdovouga&map0:HIGHLIGHT_GEOM=POLYGON((-16193.624023437511 120987.775390625,-15914.676757812511 121116.1796875,-15852.688476562511 120930.21484375,-16113.924804687511 120819.521484375,-16193.624023437511 120987.775390625))&map0:HIGHLIGHT_SYMBOL=<StyledLayerDescriptor><UserStyle><Name>Highlight</Name> <FeatureTypeStyle> <Rule> <PointSymbolizer> <Graphic> <Mark> <WellKnownName>circle</WellKnownName> <Fill> <CssParameter name="fill">%236699FF</CssParameter> </Fill> <Stroke> <CssParameter name="stroke">%23ffffff</CssParameter> <CssParameter name="stroke-width">2</CssParameter> </Stroke> </Mark> <Size>8</Size> </Graphic> </PointSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <LineSymbolizer> <Stroke> <SvgParameter name="stroke">%23ffffff</SvgParameter> <SvgParameter name="stroke-width">5</SvgParameter> <SvgParameter name="stroke-linecap">round</SvgParameter> </Stroke> </LineSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <LineSymbolizer> <Stroke> <SvgParameter name="stroke">%236699FF</SvgParameter> <SvgParameter name="stroke-width">3</SvgParameter> <SvgParameter name="stroke-linecap">round</SvgParameter> </Stroke> </LineSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <PolygonSymbolizer> <Fill> <CssParameter name="fill">%236699FF</CssParameter> </Fill> <Stroke> <CssParameter name="stroke">%23ffffff</CssParameter> <CssParameter name="stroke-width">2</CssParameter> </Stroke> </PolygonSymbolizer> </Rule> </FeatureTypeStyle></UserStyle></StyledLayerDescriptor>' --compressed --output notok.png

Output

Request (Layout 1 layout doesn't have "Follow theme" selected).

The output is properly rendered, with the highlight geometry, as requested.

curl 'http://qgis.demo/cgi-bin/qgis_mapserv.fcgi' -H 'Content-Type: image/png' --data-binary 'MAP=geopackage:/home/qgis/projects/severdovouga.gpkg%3FprojectName=highlight&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetPrint&FORMAT=png&TRANSPARENT=true&TEMPLATE=Layout 1&DPI=400&SRS=EPSG:3763&map0:extent=-16229.391033824511,120835.22371531081,-15816.92146617551,121100.47745656419&LAYERS=severdovouga&map0:HIGHLIGHT_GEOM=POLYGON((-16193.624023437511 120987.775390625,-15914.676757812511 121116.1796875,-15852.688476562511 120930.21484375,-16113.924804687511 120819.521484375,-16193.624023437511 120987.775390625))&map0:HIGHLIGHT_SYMBOL=<StyledLayerDescriptor><UserStyle><Name>Highlight</Name> <FeatureTypeStyle> <Rule> <PointSymbolizer> <Graphic> <Mark> <WellKnownName>circle</WellKnownName> <Fill> <CssParameter name="fill">%236699FF</CssParameter> </Fill> <Stroke> <CssParameter name="stroke">%23ffffff</CssParameter> <CssParameter name="stroke-width">2</CssParameter> </Stroke> </Mark> <Size>8</Size> </Graphic> </PointSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <LineSymbolizer> <Stroke> <SvgParameter name="stroke">%23ffffff</SvgParameter> <SvgParameter name="stroke-width">5</SvgParameter> <SvgParameter name="stroke-linecap">round</SvgParameter> </Stroke> </LineSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <LineSymbolizer> <Stroke> <SvgParameter name="stroke">%236699FF</SvgParameter> <SvgParameter name="stroke-width">3</SvgParameter> <SvgParameter name="stroke-linecap">round</SvgParameter> </Stroke> </LineSymbolizer> </Rule> </FeatureTypeStyle> <FeatureTypeStyle> <Rule> <PolygonSymbolizer> <Fill> <CssParameter name="fill">%236699FF</CssParameter> </Fill> <Stroke> <CssParameter name="stroke">%23ffffff</CssParameter> <CssParameter name="stroke-width">2</CssParameter> </Stroke> </PolygonSymbolizer> </Rule> </FeatureTypeStyle></UserStyle></StyledLayerDescriptor>' --compressed --output ok.png

Output

[elpaso]

@jgrocha I can reproduce the issue but I'm not sure it's a bug: the theme 'One' does not contain the polygon layer so I guess it's expected to not see it in the output even if highlight is set.

[elpaso]

mmm rethinking this it might be a bug, let me check the code.

[elpaso]

Confirmed bug

[jgrocha]

Thanks you @elpaso for looking into this issue. As you can see, I've already submitted a fix #38207. The discussing about the fix is valuable. It has clues about the best way to fix this (without using the approach I've taken at the time).

[rldhont]

Is this bug affected 3.16 ?