feat(png): measure the encoder end to end, then move what it exposed - #485

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justin13888 wants to merge 67 commits into

feat/224-png-encoder-efficiency

Commits on Sep 1, 2026

feat(png): account every byte of a PNG with deconstruct
justin13888
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fc9e589
refactor(png): expose the encoder stages behind test-support
justin13888
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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
justin13888
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ded5128
fix(png): keep the palette only when it is actually smaller
justin13888
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6b31ab9
perf(png): accelerate CRC-32 and the scanline filter loops
justin13888
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85beb2f
docs: record the gamut-png efficiency baseline and the benchmarking convention
justin13888
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fddc749
test(png): close the mutation gaps in the new efficiency code
justin13888
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1cc51fd
feat(cli): inspect PNG byte accounting
justin13888
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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
justin13888
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319c345
refactor(png): read the bigram index as one big-endian pair
justin13888
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ea4a9e2
refactor(png): make the colour-key arms total instead of unreachable
justin13888
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73e9c0b
test(png): separate palette ordering from discovery order
justin13888
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0c27e29
perf(png): index the chunk tally by type
justin13888
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934a76f
feat(png): clean invisible colour on the 16-bit paths too
justin13888
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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