Hi all,
I'm looking into channel selection, and in particular, to add the ability
to specify an alpha
channel along with either RGB or Gray.
XML wise that would look as follows:
<ChannelSelection>
<RedChannel>
<SourceChannelName>3</SourceChannelName>
</RedChannel>
<GreenChannel>
<SourceChannelName>2</SourceChannelName>
</GreenChannel>
<BlueChannel>
<SourceChannelName>1</SourceChannelName>
</BlueChannel>
<AlphaChannel>
<SourceChannelName>4</SourceChannelName>
</AlphaChannel>
</ChannelSelection>
or:
<ChannelSelection>
<GrayChannel>
<SourceChannelName>3</SourceChannelName>
</GrayChannel>
<AlphaChannel>
<SourceChannelName>4</SourceChannelName>
</AlphaChannel>
</ChannelSelection>
Now... API wise this a bit annoying as ChannelSelection does not have a
list of channels, but separate methods for the gray and RGB cases:
https://github.com/geotools/geotools/blob/main/modules/library/api/src/main/java/org/geotools/api/style/ChannelSelection.java#L23
I would consider adding an alphaChannel getter/setter in that interface,
with default implementation. Would that be ok?
While it would not break compiling, it would still break semantics of
visitors that care about channels (probably a minority) as they need to be
updated to consider the new channel source. Would you consider this a
blocker for backports?
Code wise, I would expect to have to change the following:
- Core interface and implementation
- SLD 1.0 and 1.1 parser and encoder
- CSS and eventually YSLD
- The style builder in gt-browser
- All visitors in GT/GS that care about channels (e..g, the duplicating
one)
- The grid coverage renderer to actually perform the selection
What do you think?
Cheers
Andrea
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Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions Group
phone: +39 0584 962313
fax: +39 0584 1660272
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https://www.geosolutionsgroup.com/
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