Module pyramid 

Pyramid (overview) generation.

Takes a full-resolution RasterTile and produces a chain of half-resolution tiles — one per pyramid level — using a resampling kernel.

Convention

• Level 0 is the input (full resolution).
• Level N has dimensions width >> N × height >> N (rounded down, minimum 1).
• We stop at the level where both dimensions are ≤ min_dimension (default 256) — no point in serving a 64×64 thumbnail at zoom 0 of a global mosaic.

Structs

PyramidOptions

Functions

build_overviews

Produce a chain of overview tiles from base (treated as level 0). The returned Vec does NOT include the base — index 0 of the result is the level-1 overview (half resolution).