rob thijssen
acf99f849b
codec/iip.rs:
- TileCache: (fb_width/16 × fb_height/16) tiles, 8 versions × 256 bytes
each, matching t.java's (8, 16*16) allocation
- TileEntry: versioned read/write at byte offsets within tile data
- decode_iip() handles all 4 modes from the control byte:
- Mode 0/12 (cache-read): tile control bytes select which cached
version of each 16x16 tile to display, no new pixel data on wire
- Mode 4 (write-only): Tight-decoded pixel data written to cache
- Mode 8 (update+read): conditionally writes new data to cache
(bit 7 of control byte = 0 means update), then reads from cache
- Tile control bytes compressed via zlib (varint length) when >= 12
- Sub-types 1-4/8 map to bit-depths 1/2/4/4/8 bpp
- Cache resized on framebuffer resize (ModeChange msg 128)
Wired into session dispatch for encoding 9. Not advertised in default
encoding list — only active if explicitly requested.
codec/tight.rs: made get_or_init() pub for IIP's zlib access.
39 tests passing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>