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This PR adds support for SDF sprites.
Though not very well documented, the mapbox-gl-js has support SDF sprites for years.
Such sprites contain "distances" instead of the regular color information:
In such cases, the
sprite.json
has asdf: true
on each image.The benefits of the SDF sprites include better scalability and ability to recolor the images nicely.
We would like to start using SDF sprites in MapTiler in the future, but still remain compatible with the
ol+ol-mapbox-style
stack, so this PR adds a basic support for the SDF sprites.There is no performance change for non-SDF sprites at all.