Newly converted .nitro bundles now store their spritesheet as WebP VP8L
instead of PNG, so imports land much smaller without changing a single
pixel. The texture member and spritesheet.meta.image are both labelled
from the actual bytes, never from a caller's assumption.
- encode through sharp with lossless and exact, so colour hidden under
alpha 0 survives; this mirrors ImageSharp's TransparentColorMode.Preserve
- detect PNG/WebP by magic bytes and reject anything the client cannot
render, on create, download and upload paths
- keep the source format when deriving size-32 sheets, scaling composites
and editing metadata, so existing bundles are never silently rewritten
- report fidelity in the studio: the compression panel re-encodes with the
same options the importer uses, so it cannot drift and invent false
warnings, and shows PNG/WebP size estimates
convertSwfToNitro and buildSpritesheet are now async, so the worker, the
main-thread fallback and every import call site await them. PNG stays
supported for existing bundles and icon sidecars are untouched.
resolveNitroFrame now matches spritesheet frame keys that carry a .png
suffix or namespaced naming, and isScale/scaleName preserve that suffix.
Broken source sprites (missing frames or references to icon artwork) are
skipped and reported instead of aborting the whole generation, and the
studio UI surfaces the skipped count.
openhands
Simo