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Draw the active layer's storage tiles over the canvas: a faint
TILE_SIZE grid over the document, every stored tile filled and
labelled tx,ty, tiles with identical pixels in one colour per group
and unique tiles in blue. It shows how sparse a layer is, which tiles
copy-on-write shares, and which ones .pcraft saves once.
It has no menu item and isn't a View > Show item. The control channel
and MCP turn it on with ui.set {"tileGrid": true}; ui.inspect reports
it as view.tile_grid, and View > Extras doesn't hide it.
Grouping hashes each distinct tile allocation once, in parallel (or
serially while jobs hold the pool, #1554), cached per document
revision and active layer. A 36 MP layer of all-different tiles groups
in 3.9 ms (8-bit) and 7.5 ms (16-bit) on 24 cores in release; the
ignored tile_grouping_36mp test reproduces this.
Also documents tileGrid in docs/control-protocol.md and
docs/development.md, and adds my contributors/people.toml entry.
Co-authored-by: Claude Opus 5.5 <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>