G11: Shape Builder's edge-source grid holds a bounded number of references

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Follow-up to #4021. The grid filed each piece of a segment under its cells
without checking, so a degenerate grid (collinear horizontal lines: cells a
hundred points wide and a hair tall) stored one segment ~400 times per cell,
and coincident vertical segments (one column, a row per segment) filed every
segment under every row: a quadratic number of references, about a GiB for
16,384 segments within the Shape Builder's limit.

Now a segment is filed once per cell (its pieces come in order, so the cell's
last entry is enough to check), and the grid holds a budget of references
(64 per item plus four rows' or columns' worth, `reference_budget`); the
items past it go to the scanned list, so the index stays O(n·sqrt(n)) in
memory and every lookup still finds every segment through its point.

Regression: `rect_index_holds_a_bounded_number_of_references` (fails without
the change: 4,100 references per cell for ten collinear lines).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014gCpjL3yUhaH3jRp7ksufh

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Angelo Bernardini

2026-10-26 09:09:44 +07:00

committed by bflatastic

co-authored by Claude Fable 5.1

parent 3567e5be7d

commit 6f8ac34f38

3 changed files with 67 additions and 12 deletions

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