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Build # 4692

Build Type

push

travis-ci

Committed by aschampion

Commit Message

Stack: convert zoom levels to explicit downsample factors

Replace `num_zoom_levels` with a `downsample_factors` array where each
element specifies downsampling factors along each dimension. The old
behavior of inferring XY-only power of 2 downsampling until the entire
stack fits in 1k by 1k is preserved when this value is null.

On the front-end, tile layers now respect anisotropic, non-power-of-2
planar downsampling at each zoom level. Tile layers also respect
downsampling along the z axis, showing the nearest downsampled tile at
the zoom level (assuming top-left preserving downsampling).

Stack viewers assume the effective scalar downsampling (in screen pixel
space) for each zoom level is the largest planar downsampling factor for
the primary stack at that zoom level. Stack viewers still navigate in
scale level zero space (so do not skip z sections based on z
downsampling), and all scaled stack coordinates are scaled based upon
the scaled scale level zero stack coordinates.

To support arrays of composite Postgres fields, it is necessary to
register the composite fields with psycopg2, because Django's
`ArrayField` does not serialize and deserialize properly with custom
composite types.

Closes catmaid/CATMAID#1710.

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