- [~] Paired chroma palette clustering now preserves current libaom's squared two-component distance, first-centroid tie order, independently rounded U/V means, paired deterministic empty-cluster replacement, preceding-state retention on increased distortion, and 50-iteration limit. Keeping the source planes separate avoids interleave/deinterleave copies and improves on libaom's AVX2 ceiling with Vector512, Vector256, Vector128, then scalar dispatch through ImageSharp's shared vector-count helpers. Three independent tests cover exact paired convergence, midpoint initialization, 12-bit distance and index parity, untouched destination bounds, and every intrinsic tier. The exact Release test-project build reports 1,992 baseline warnings and zero errors; the focused three-case set, complete 8,934-case AVIF set, and complete 230-case HEIF set pass direct foreground net11 Release VSTest. Roslynk reports zero compiler errors and no touched-file analyzer warnings. Candidate integration and production activation remain in the open chroma-palette checkpoint.
- [~] Live paired chroma palette selection now follows current libaom's complete 2-through-8 color-size search, U-plane neighbor-cache snapping, stable U-ordered color pairs, shared U/V index map, implicit DCT-DCT transform, and strict rate-distortion winner replacement. It improves on speed-configured libaom by applying no early header-cost pruning, keeps planar U/V source data separate, and reuses the SIMD-first prediction, residual, transform, quantization, and reconstruction operators without allocator-backed candidate storage. The production tile regression proves both palette-mode probability branches, exact paired colors and indices, coefficient-free reconstruction, and nonempty syntax. The complete 58-case intra-superblock set, 8,935-case AVIF set, and 230-case HEIF set pass direct foreground net11 Release VSTest. The exact Release test-project build reports 1,992 baseline warnings and zero errors; Roslynk reports zero compiler errors and no touched-file analyzer warnings. Production frame activation remains the next checkpoint.
- [~] Production palette activation now matches current libaom's default good-quality screen detector: it scans only complete 16x16 luma blocks, normalizes high-bit-depth samples to eight bits, admits 2-through-4-color blocks, and uses the reference's strict greater-than-ten-percent frame-area threshold. A 256-bit stack bitset and a fifth-color early exit replace libaom's larger per-block histogram without changing the decision, allocation, or source precision. The adaptive sequence flag remains enabled, the frame flag is set before picture-state allocation, and intra-block copy remains disabled. Focused regressions prove strict-threshold equality, high-bit-depth normalization, five-color rejection, emitted frame-header activation, production decode, and generated payload retention. The exact Release test-project build reports 1,992 baseline warnings and zero errors; all 8,935 AVIF cases and all 230 HEIF cases pass direct foreground net11 Release VSTest. Current-main `aomdec` at `a40ed1ea9e4ecc3df58a5bccb76623f2c94ae727` accepts all 30 regenerated production payloads, including the 54-byte palette case. Roslynk reports zero compiler errors and no touched-file analyzer warnings.
- [~] Intra-block-copy rate accounting now uses the live frame-local flag and displacement-vector distributions without copying or adapting either context during candidate measurement. Displacement-vector costing and writing share one closed symbol operation over the exact current-libaom joint, sign, magnitude-class, class-zero, and integer-offset syntax; mode search applies libaom's 120/128 displacement-rate weight with nearest-integer rounding. Independent fixed costs cover all four joint states, both signs, class zero, and large offset classes before adaptive writes, followed by an encoder/decoder round trip through the same sequence. Encoder and decoder reference-vector derivation now share the exact eight-candidate spatial scan, independent nearest and outer-region ranking, top-right partition geometry, clamping, and tile-relative fallback. Selected vectors use a naturally aligned pair of signed 16-bit components packed into the existing picture-state owner only when intra-block copy is permitted; a 3840x2160 frame retains 130,560 vectors in 510 KiB while leaving the compact 8-byte mode allocation unchanged. The tile writer derives the same reference and emits the retained vector without another allocation or copy. The exact net11 Release build reports 1,005 baseline warnings and zero errors; all 13 focused ownership, mapping, reference, and syntax cases, all 9,009 AV1 cases, and all 206 non-AV1 HEIF cases pass through direct foreground VSTest, and Roslynk reports zero compiler errors. Legal source search, joint luma/chroma rate-distortion selection, production activation, and adaptive frame-flag clearing remain before intra-block copy can be enabled.
- [~] Intra-block-copy rate accounting now uses the live frame-local flag and displacement-vector distributions without copying or adapting either context during candidate measurement. Displacement-vector costing and writing share one closed symbol operation over the exact current-libaom joint, sign, magnitude-class, class-zero, and integer-offset syntax; mode search applies libaom's 120/128 displacement-rate weight with nearest-integer rounding. Independent fixed costs cover all four joint states, both signs, class zero, and large offset classes before adaptive writes, followed by an encoder/decoder round trip through the same sequence. Encoder and decoder reference-vector derivation now share the exact eight-candidate spatial scan, independent nearest and outer-region ranking, top-right partition geometry, clamping, and tile-relative fallback. Selected vectors use a naturally aligned pair of signed 16-bit components packed into the existing picture-state owner only when intra-block copy is permitted; a 3840x2160 frame retains 130,560 vectors in 510 KiB while leaving the compact 8-byte mode allocation unchanged. The tile writer derives the same reference and emits the retained vector without another allocation or copy. Coefficient costing and writing now select the inter transform sets and frame-local probability tables required by intra-block copy; independent tests verify every legal symbol against the exact default inter distribution and round-trip full and reduced sets from 4x4 through 32x32. The exact net11 Release build reports 1,992 baseline warnings and zero errors; all 1,950 entropy cases, all 9,017 AV1 cases, and all 206 non-AV1 HEIF cases pass through direct foreground VSTest, and Roslynk reports zero compiler errors with no touched-file analyzer warnings. Legal source search, joint luma/chroma rate-distortion selection, production activation, and adaptive frame-flag clearing remain before intra-block copy can be enabled.
- [x] The expanded checkpoint exposed a pre-existing transform-block test that asserted uninitialized pooled padding was zero. The test now initializes the complete physical luma plane with a sentinel and proves the block operation leaves both adjacent padding samples unchanged. The exact net11 Release rebuild remains at 1,005 baseline warnings and zero errors, the focused allocator-order set passes 30 of 30 cases, and the complete HEIF/AV1 namespace passes 8,859 of 8,859 direct VSTest cases with zero failures or skips.
- [x] Combined-frame OBU output now counts the byte-aligned frame and tile-group headers, non-final tile-size fields, and owned tile payloads before emitting the OBU size. It retains only the small allocator-owned header scratch and writes each entropy-coded tile span directly from its detached owner, removing the second file-sized allocator rent and complete-payload copy. A 64 KiB regression proves exactly one sub-payload-sized byte rent with a balanced return and verifies the exact streamed tile tail; the existing two-tile round trip proves size-prefix and ordering parity. The focused writer and production-frame set passes 32 of 32 direct net11 VSTest cases, current-main `aomdec` accepts all 29 generated native-format payloads, and the complete HEIF/AV1 namespace passes 8,860 of 8,860 cases with zero failures or skips.
- [x] Finalized fixed-block decisions now set the block-level transform-skip flag only when every retained luma and coded chroma transform has zero EOB, matching current libaom's conjunction of per-plane skip state. The previous always-false flag produced legal but redundant non-skip and zero-coefficient syntax. Monochrome and 4:2:0 regressions prove both branches from actual coefficient state; the focused decision and production-frame set passes 32 of 32 direct net11 VSTest cases. Current-main `aomdec` accepts all 29 regenerated payloads, the recorded decoded-frame MD5s are unchanged, and affected 16x16 constant 8-bit and 10-bit payloads are one byte smaller. The complete HEIF/AV1 namespace passes 8,862 of 8,862 cases with zero failures or skips.
James Jackson-South
1 month ago