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Read WebP/JPEG comps through a sibling PNG cache instead of forcing PNG

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comp-spec, comp-diff, build-phase, font-match, and generate-image now decode any comp raster via loadRaster(), converting non-PNG input to <file>.png next to the source. Sessions used to hit 'not a PNG' and rewrite the .webp in place with PNG bytes, which broke transcript replay (a later step rewrites the comp beyond the cut) and left a mislabeled file.

AI-assisted (Claude Code).
This commit is contained in:
Paul Bakaus
2026-08-28 06:13:59 +05:00
committed by Abdul Wahab
parent 95294e464a
commit 48350ffb14
7 changed files with 63 additions and 15 deletions
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tests/comp-diff.test.mjs
+19 -2
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@@ -1,12 +1,12 @@
import { describe, it, before } from 'node:test';
import assert from 'node:assert/strict';
import { spawnSync } from 'node:child_process';
import { spawnSync, execFileSync } from 'node:child_process';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { decodePng, encodePng } from '../skill/scripts/lib/png.mjs';
import { decodePng, encodePng, loadRaster } from '../skill/scripts/lib/png.mjs';
import { createImage, fillRect, blit, crop, resize, drawText } from '../skill/scripts/lib/raster.mjs';
import { compare, verdictFor, alignBuild } from '../skill/scripts/comp-diff.mjs';
import { dominantColors, structureScore, detailScore } from '../skill/scripts/lib/image-metrics.mjs';
@@ -223,3 +223,20 @@ describe('comp-diff CLI', () => {
assert.match(res.stderr, /usage/);
});
});
it('loadRaster reads a WebP comp through a sibling .png cache instead of rewriting the source', () => {
const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'raster-'));
const src = path.join(dir, 'comp.webp');
const png = encodePng((() => { const i = createImage(24, 16); fillRect(i, 0, 0, 24, 16, [200, 40, 40, 255]); return i; })());
fs.writeFileSync(path.join(dir, 'seed.png'), png);
let ok = true;
try { execFileSync('cwebp', ['-lossless', path.join(dir, 'seed.png'), '-o', src], { stdio: 'ignore' }); } catch { ok = false; }
if (!ok) return; // no cwebp on this machine: nothing to assert
const before = fs.readFileSync(src);
const { image, path: decoded } = loadRaster(src);
assert.equal(image.width, 24);
assert.equal(image.height, 16);
assert.equal(decoded, `${src}.png`);
assert.ok(fs.readFileSync(src).equals(before), 'source webp bytes untouched');
assert.ok(fs.existsSync(`${src}.png`), 'sibling cache written');
});