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* av1enc: motion search with a visited set and early-exit SAD, fixed-size SATD, region-only BlockDecoded snapshot - motion_search remembered nothing: the diamond search evaluated the previous centre again and every SAD ran to the last row even when it had already lost. Full-sample and sub-sample positions are now tracked in a visited list (costs are deterministic, so a position that was evaluated cannot beat the best cost again), and the SAD stops after a row once sad + mv cost can no longer be below the best cost. The stop test is the same f64 expression as the strict "<" the callers apply, and it is monotone in the SAD, so the chosen vector is the same. - satd runs with a fixed block size (satd_k::<4> / satd_k::<8>): the difference block is a [[i32; K]; K], the vertical butterflies work on whole rows at once, and the old per-column gather is gone. The sum is an integer sum of the same values. - A snapshot copies only the BlockDecoded cells of the block area (at most 16x16 per plane), the only flags coding inside the block can change, instead of the whole 3x35x35 array. The encoded stream is unchanged. A unit test compares the new SATD with the previous implementation for 4..32 sample blocks at 8 and 10 bit. Fixes #2387 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> * av1enc: tests for the region-only BlockDecoded snapshot and the bounded SADs - `snapshot_restore_brings_back_every_blockdecoded_flag`: for every block size of a 64x64 superblock (4x4 .. 64x64) at every aligned position in two superblocks, from an all-clear and a random flag state, marking every sub-block of every size inside the block and restoring gives back the whole 3x35x35 array, so the 16x16 region covers every flag coding can set and leaves the neighbours alone. - `bounded_sad_stops_only_once_the_cost_cannot_win`: `sad_ref` and `sad_bounded` return the full SAD whenever `sad + lb < bound`, and otherwise a partial sum that already loses the strict `<` of the callers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com> Co-authored-by: Codex <noreply@openai.com> Co-authored-by: FredApps <153173854+FredApps@users.noreply.github.com>