Module bridge 

The bridge between world pixels and the document’s own integer geometry, encoded once (the conversion table in docs/op-emitter-playbook.md). Each op emitter lands the rows it consumes through these, and the geometry layer reads them back through the same functions, so a rect drawn and a rect committed cannot disagree about where a cell is.

Functions

artwork_rect

The inverse of screen_rect.

grid_point

A world-space gesture point onto the grid cell nearest it.

grid_rect

The grid rect a two-corner gesture drew — either corner may be either end of the drag.

grid_size_ceil

A world-space extent as the whole cells that fully enclose it — the measured size a text box records.

grid_vec

A drag delta as the whole-cell offset the move commits at.

px_point

The world-space corner of a grid cell — the inverse of grid_point.

px_rect

The world-space rect a grid rect covers.

px_vec

The world-space vector a snapped grid_vec covers — what artwork riding a grid move (a block’s icon) translates by.

screen_rect

Artwork geometry — free-floating images and block icons — is the one float rect the document stores: unsnapped, so a placed image keeps the aspect the drag gave it.