Chose the CURSOR over a pixel-coverage count because the corpus cannot
choose -- 25 of 25 of the R761 delivery's RLE8 BMPs paint every pixel,
25 of 25 reach the end of the frame, 0 of 25 use a delta -- and an
independent decoder can: a delta and an end-of-line escape state their
skip, so every decoder agrees on the index-0 pixels they pass over, while
a pixel count would refuse both constructions the format defines.
`_bmp_rle8_rows` now refuses (`asset_samples_invalid`) when the terminator
arrives with the cursor short of the last row. Pillow reads 5 of the 8
streams in the table and refuses the same 3, one of them short by a
single pixel.
Both docstrings the round was sent to correct are rewritten: the test no
longer claims every pixel is decoded (it is not -- a stated skip keeps
index 0), and `_bmp_rle8_rows` no longer frames the delta argument as
read off the corpus, which it never was.
R761 rebuilt: bundle `diff -r`-identical to the build before this commit,
50 assets (29 JPEG + 21 PNG), 19 of 19 conversions, SHY 71, u = 0, d = 0.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Kjell Tore Guttormsen
561b609a53