[Marble-devel] Review Request 118681: Add a thumbnailer for the supported geo data files (GPX, OSM, KML, ESRI)

[Friedrich W. H. Kossebau]

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https://git.reviewboard.kde.org/r/118681/
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Review request for Marble, Dennis Nienhüser and Torsten Rahn.


Repository: marble


Description
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As inspired by https://git.reviewboard.kde.org/r/118618/ I brushed up the thumbnailing code I drafted almost 2 years ago in the train on my way back from the Marble sprint in Prague. A shame I did not do that earlier.

It is another example where renderer state would be good to know. The current approach works more or less. Now and then no thumbnail is created, have yet to find out when this happens. And in the attached sample screenshot the New York KML files are for some reason not correctly zoomed in some thumbnails. Should be a useful testbed for the render status work. But IMHO good enough for a merge already.

The thumbnailer is only built in non-Qt-only mode. The service desktop files are installed for each geo data file type from the respective runner plugin sources, following the pattern of the App/KPart service desktop files.

Future improvements will be to make it configurable which map theme to use (now hardcoded to "earth/openstreetmap/openstreetmap.dgml"). Might get interesting for non-earth geo data files :) surely needs some more input from the experts.
Not sure if thumbnails should be cached or not. Set it to "true" for now. Sadly this cannot be controlled case-by-case (e.g. if thumbnail has lower quality due to missing map theme data).


Diffs
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  src/CMakeLists.txt d7ea7b1 
  src/plugins/runner/gpx/CMakeLists.txt 460c43a 
  src/plugins/runner/gpx/marble_thumbnail_gpx.desktop PRE-CREATION 
  src/plugins/runner/kml/CMakeLists.txt f964a85 
  src/plugins/runner/kml/marble_thumbnail_kml.desktop PRE-CREATION 
  src/plugins/runner/kml/marble_thumbnail_kmz.desktop PRE-CREATION 
  src/plugins/runner/osm/CMakeLists.txt 392b2cf 
  src/plugins/runner/osm/marble_thumbnail_osm.desktop PRE-CREATION 
  src/plugins/runner/shp/CMakeLists.txt ccc0c9d 
  src/plugins/runner/shp/marble_thumbnail_shp.desktop PRE-CREATION 
  src/thumbnailer/CMakeLists.txt PRE-CREATION 
  src/thumbnailer/main.cpp PRE-CREATION 
  src/thumbnailer/thumbnailer.h PRE-CREATION 
  src/thumbnailer/thumbnailer.cpp PRE-CREATION 

Diff: https://git.reviewboard.kde.org/r/118681/diff/


Testing
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Enabled previews for the geo data files (Dolphin > Preferences > General > Previews) and browsed all kind of folders with geo data files.

To get rid of cached thumbnails do "rm ~/.thumbnails/ -r" or set CacheThumbnail=false in the desktop service files.


File Attachments
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Thumbnails in KML example folder
  https://git.reviewboard.kde.org/media/uploaded/files/2014/06/12/5503799d-318e-45d7-856c-6d505d8c95c6__thumbnails.png


Thanks,

Friedrich W. H. Kossebau

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