feat(png): clean a caller-supplied palette before writing it - #614

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justin13888 wants to merge 99 commits into

feat/482-png-caller-palette-cleaning

Commits on Sep 1, 2026

feat(png): account every byte of a PNG with deconstruct
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fc9e589
refactor(png): expose the encoder stages behind test-support
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27359a2
chore(png): benchmark encode size, bpp and per-stage throughput
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92a1474
test(png): pin the output size against libpng at maximum compression
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78466a1
feat(png): opt-in cleanup of invisible pixel colour
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ded5128
fix(png): keep the palette only when it is actually smaller
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6b31ab9
perf(png): accelerate CRC-32 and the scanline filter loops
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85beb2f
docs: record the gamut-png efficiency baseline and the benchmarking convention
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fddc749
test(png): close the mutation gaps in the new efficiency code
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1cc51fd
feat(cli): inspect PNG byte accounting
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f360e51
feat(png): reduce binary alpha to a tRNS colour key
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54eb160
docs(png): record the colour key in the axis scorecard
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1529ab0
feat(png): order the palette, and close the colour-key mutation gaps
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364efa9
docs(png): refresh the efficiency tables after palette ordering
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cb1c377
feat(png): entropy and bigram filter heuristics
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4fa858b
fix(png): emit a filtered row when every filter candidate ties
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319c345
refactor(png): read the bigram index as one big-endian pair
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ea4a9e2
refactor(png): make the colour-key arms total instead of unreachable
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73e9c0b
test(png): separate palette ordering from discovery order
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0c27e29
perf(png): index the chunk tally by type
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934a76f
feat(png): clean invisible colour on the 16-bit paths too
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25b1a14
docs: settle the counter rule, the png authority row and two counts
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dbb0d80
fix(png): budget the quantity the decoder budgets
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82220cc
test(png): cover the greyscale colour key
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c16ac22
test(png): pin the size race a colour key can lose
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ef73616
test(png): re-pin sub-byte indexed auto-reduce
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589261f
fix(png-cli): say why the filter scan was skipped
justin13888
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8dcac02
docs(cli): state what inspect's exit code means per format
justin13888
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0d680a8
refactor(png): delete choose_min_sum_abs
justin13888
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e858818
test(png): derive every size budget from its measurement
justin13888
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9ca0f19
fix(png): race the cleaned encoding instead of assuming it wins
justin13888
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8e9f038

Commits on Sep 2, 2026

Commits on Sep 5, 2026

Commits on Sep 6, 2026

Commits on Sep 9, 2026

Commits on Sep 10, 2026

Commits on Sep 25, 2026

docs(png): describe the truncate-form trim and narrow the palette cost claim
justin13888
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c1108f1