Two request families, and they run on opposite threads on purpose.
`assets.bodies` (BridgeBodies) answers the question only code inside ServUO
can: the atlas knows a creature by the class name in Spawns/*.xml, the client
knows it by a body id, and nothing in the tree declares the mapping. Construct
the type, read Body.BodyID, Delete(). That is world mutation, so it answers on
the CORE thread and is the one family here that does not take the asset
worker's slot -- and the batch is capped at 100 names, REFUSED rather than
truncated, because a truncated answer is indistinguishable from a complete one
from the website's side.
`assets.manifest` / `assets.fetch` (BridgeCatalog) are the catalogue, on the
worker. The manifest carries { key, sha256, bytes, width, height } and no
pixels, so an Update fetches only what moved; the fetch carries base64 PNG.
The scan keeps the bytes it hashed rather than decoding all 787 sprites twice.
Three things worth stating about the shapes:
- It pages on the WALL CLOCK as well as on bytes. The rows are ~90 bytes and
the whole catalogue is one page by the byte budget, but building it means
decoding hundreds of sprites against a 10 s reply timeout.
- `catalog` is derived from the client files (sizes, mtimes, both direction
settings, EXTRACTOR_VERSION), not minted per build -- the cache is released
when idle, and a fresh id per build would force a restart mid-import although
nothing about the client moved.
- ARGB1555 is expanded to 32bpp here rather than handed to GDI+, because what
it does with a one-bit alpha channel varies by platform and a black rectangle
behind every sprite would pass any test that only checked the bytes decoded.
Nothing trusts the library's success. Every body goes through CheckEntry and
AnimationRecordSane before it is decoded, which is what keeps the 357 bodies
whose index entry reads `length 0` -- and which the decoder hands back the
PREVIOUS creature's bitmap for -- out of the catalogue.
Walked on a live shard: 787 rows in one 734 ms page; bodies 320, 607, 666 all
absent rather than wrong; 783 at direction 1 and 4 at direction 0; all 455 stock
creature classes resolved at ~190 ms per 100 with zero mobiles leaked.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016wDDVXWMDz82WqE1i969r4
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