This is to make it possible to use the proto definitions
from Python where the directory structure otherwise
prevents them from being imported in the usual way.
Signed-off-by: Wolfgang Hess <whess@lyft.com>
Adds value conversion tables to perform lazy computations of lookup tables for mapping from a uint16 value to a float in [`lower_bound`, `upper_bound`].
Owners of the value conversion tables are `SubmapController`, `PoseGraph2D`, `ActiveSubmaps` and `ProbabilityGridPointsProcessor`. For concurrency reasons, having only a single owner is not possible.
Follow up PR in `cartographer_ros` is prepared.
The probability grid points processor can now be configured to write the probability grid as pbstream. Before it was only possible to write the probability grid as png.
- Introduce `RangeDataInserterInterface` as common interface for all range data inserters
- Introduce a minimal `GridInterface` as a base for a common interface for 2D and 3D grids
- Rename `RangeDataInserter2D` to `ProbabilityGridRangeDataInserter2D`
- Move grid generation logic from `Submap2D` to `ActiveSubmaps2D`
- Update proto and configuration structure to mirror the code structure - backwards compatibility is maintained
- Step towards [RFC 0019](https://github.com/googlecartographer/rfcs/blob/master/text/0019-probability-grid-and-submap2d-restructuring.md)
It is removed from everywhere but 'scan_matching', 'pose_graph'
subfolders of 'mapping_2d'.
[Code structure RFC](e11bca586f/text/0000-code-structure.md)
- Refactor ProbabilityGridPointsProcessor for code reuse.
- Adds Image::width and height.
- Adds GetFilename for FileWriter.
Related to googlecartographer/cartographer_ros#475.