mirror of
https://github.com/storytold/vectorcraft.git
synced 2026-10-24 09:46:59 -06:00
Taha-Mahmoodi
4e0cbfeede
With image mips on (the canvas always sets them), drawing an image fetched its full decoded pixels first, decoding them again when the shared image store no longer held them, and only then looked up the mip it draws. The full pixels are only peeked, so they are the least recently used entries and the first the store drops over its budget (1 GiB on macOS and Windows). Once a document's full-size images exceed it (20 photos of 6000 x 4000 px are 1.9 GB as RGBA), every frame decoded every image again, though only their small mips were drawn: moving one image redrew seconds later. The store now remembers the size each blob's pixels decode to, so the mip level is found without the pixels, and a mip the store holds is drawn (and marked used) without fetching or decoding them. Without the mip, at full size, or with mips off (exports) drawing is unchanged. Measured on an Apple M4 (load average 15-24 from other work), 20 noise PNGs of 6000 x 4000 px fitted in a 2880 x 1800 view, one moved 5 pt per frame: before, 20 decodes and 1.1-3.0 s every frame; after, the first frame decodes 20 and the later ones none, in 3-5 ms.