Three 16x16 bilevel fax3 test images covering the key Group 3 variants:
- seq-1c-1b-fax3: basic G3, no fill bits, MSB-first fill order
- seq-1c-1b-fax3-fillbits: G3 with T4Options fill bits (byte-aligned EOLs)
- seq-1c-1b-fax3-lsb: G3 with FillOrder=2 (LSB-first)
All use MinIsWhite photometric with inverted sequential pattern, producing
the same decoded CRC32 hash (71f6a21a) as the uncompressed 1-bit images.
Cross-validated: libtiff writes the images, both libtiff and image-tiff
read them back and agree on the decoded data.
Address PR review feedback:
- Remove benches/decode.rs which referenced non-existent gen_bench_tiff.c
- Simplify compute_tiff_hash: replace 66-line match block with
as_buffer().as_bytes() + ByteOrder::convert for LE normalization
- Use TIFF Type repr(u16) as hash discriminant instead of ad-hoc u8
- Rename all 74 seq test images to match updated hashes
Move 74 seq-*.tiff test images to tests/images/seq/ and embed a CRC32
hash of the full decoded output (dimensions, color type, sample data)
as the last filename segment. Replace 75 individual test functions with
one generic verify_all_seq_images test that decodes each file and
validates its hash against the filename.
This catches byte-order, bit-alignment, stride, padding, and value
errors that sum-based tests would miss (e.g., swapped pixels preserve
the sum but change the hash). Adding new test images only requires
dropping a correctly-named file in seq/ — no test code changes needed.
Lilith River