Hold generated companion themes to a contrast floor - #324
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A companion theme is built by inverting an authored palette, and inversion is not contrast-preserving: a colour picked to read against a dark surface can land far too close to the inverted light one. Monokai's generated light companion had syntax tokens at a 1.30 contrast ratio and Dracula's at 2.23 -- the first is effectively invisible. Generated companions are now corrected where they fall short. Authored palettes are untouched: those are an author's choice and are governed by theme-legibility.spec.mjs. monokai-light 1.30 -> 3.03 dracula-light 2.23 -> 3.08 graphite-light 3.83 (unchanged) morning-dark 5.57 (unchanged) nord-light 3.33 (unchanged) catppuccin-light 4.36 (unchanged) Colours already clearing the floor are returned untouched rather than normalised, which is what the catppuccin case in the spec pins. The correction walks lightness in OKLCH with hue and chroma held. The obvious alternative -- blending toward black or white until the ratio is met -- also works, but it desaturates as it goes and drags the hue with it, so an amber warning arrives washed out and slightly wrong rather than simply lighter. A spec asserts no token that was chromatic in the authored theme comes out grey. This revives the palette half of #204, which has sat unmergeable since July with 15 of its 20 files since moved on main. The mechanism is new; the problem it solves is the one that PR identified. Also adds src/ui/oklch.ts: sRGB <-> OKLab/OKLCH from Ottosson's published derivation, checked against his reference values and round-tripped over the sRGB cube so a mistyped matrix constant fails loudly rather than skewing every colour that uses it. Hand-rolled rather than adding culori because this is the only colour maths jedit needs. Contrast measurement and correction moved to src/ui/theme-contrast.ts. jedit-themes.ts owns what a theme is; this owns whether a colour can be read on the surface behind it. That also keeps jedit-themes.ts under the 500-line limit, which the addition had pushed it past at 552. Refs #204, #309
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WalkthroughThe change adds RGB-to-OKLCH conversion utilities and shared WCAG contrast logic. Generated companion themes now adjust token lightness to meet contrast thresholds. New tests validate conversion accuracy, palette contrast, bidirectional correction, nearest passing lightness, and chroma preservation. ChangesTheme contrast correction
Estimated code review effort: 3 (Moderate) | ~30 minutes Merge Risk: 🔵 Low · up to Generated companion themes may meet the contrast floor while receiving a needlessly large darkening adjustment. This is bounded to regression coverage for the nearest-adjustment behavior and should be strengthened before relying on that guarantee. Sequence Diagram(s)sequenceDiagram
participant ThemeGenerator
participant ContrastAdjustment
participant OKLCH
participant ContrastMath
ThemeGenerator->>ContrastAdjustment: pass inverted palette
ContrastAdjustment->>OKLCH: convert token color
OKLCH-->>ContrastAdjustment: return lightness, chroma, hue
ContrastAdjustment->>ContrastMath: check contrast against surfaces
ContrastAdjustment->>OKLCH: convert adjusted lightness to RGB
OKLCH-->>ContrastAdjustment: return corrected token color
ContrastAdjustment-->>ThemeGenerator: return corrected companion palette
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@src/ui/oklch.ts`:
- Around line 55-61: Extract the inline color-transform coefficients used by the
OKLCH conversion into named constants or fixed conversion matrices, then reuse
those definitions in both transform directions. Update the relevant conversion
functions around the lightness, greenRed, and blueYellow calculations while
preserving the published coefficient values and ensuring both transforms use
matching shared definitions.
In `@src/ui/theme-contrast.ts`:
- Line 57: Update the correction logic around relativeLuminance and
passesContrast to search both LIGHTER and DARKER candidates instead of choosing
only the direction based on ground luminance. Retain candidates that satisfy
passesContrast, then select the passing result requiring the smallest lightness
change; add a regression test covering the 0.05 token luminance, 0.10 surface
luminance, and 4.5:1 contrast case.
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Review finding on this PR, and a real defect. legibleOn picked its search direction from whether the colour was lighter or darker than the average background, then walked only that way. That can commit to a dead end: a token at relative luminance 0.05 on a 0.10 surface tops out at a 3.00 ratio even at pure black, while walking the other way reaches 7.00. Asked for 4.5, the old code returned black at 3.00 and reported nothing wrong. No built-in theme hit this -- every generated companion's worst-token ratio is byte-identical before and after (monokai-light 3.03, dracula-light 3.08, graphite-light 3.83, nord-light 3.33, catppuccin-light 4.36, morning-dark 5.57). It would have bitten the first authored palette whose surfaces sat in the middle of the range. Both directions are now searched one step at a time, so whichever clears the floor first wins and the answer is also the smallest lightness change that works. A colour already clearing the floor returns untouched before any search. When neither side can clear it -- surfaces too close together to admit any passing colour -- the end with the most available contrast is returned as an honest best effort rather than a silent stop mid-walk. Two specs pin it: the 0.05-on-0.10 dead end now reaches 4.5, and a token just below a mid grey surface darkens rather than jumping across to the light side. Also extracts the OKLCH coefficients into four named matrices with a shared multiply, per the other review finding. Note the two directions cannot share coefficients as the review suggested -- they are inverse matrices, not the same values reused -- so each is transcribed rather than derived from its partner; inverting at runtime would introduce error the published values do not have. The reference-value and full-cube round-trip specs both still pass, which is what proves the refactor preserved the maths.
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Both findings addressed in Contrast search direction — valid, fixed. This was a real defect, not a style issue. Both directions are now searched one step at a time, so whichever clears the floor first wins and the result is also the smallest lightness change that works. A colour already clearing the floor returns untouched before any search runs. Where neither side can clear it — surfaces too close together to admit any passing colour — the end with the most available contrast is returned as an honest best effort rather than stopping silently mid-walk. Two regression specs added: the 0.05-on-0.10 dead end (your case) now reaches 4.5, and a token just below a mid-grey surface darkens rather than jumping across to the light side. Worth noting no built-in theme hit this. Every generated companion's worst-token ratio is unchanged — monokai-light 3.03, dracula-light 3.08, graphite-light 3.83, nord-light 3.33, catppuccin-light 4.36, morning-dark 5.57. It would have bitten the first authored palette whose surfaces sat mid-range. OKLCH coefficients — extracted, with one correction to the premise. The coefficients are now four named matrices ( They cannot be reused across both directions as suggested, though: the forward and inverse transforms are inverse matrices, not the same values applied twice. Deriving one from the other at runtime would introduce numerical error that the published values don't carry, so each is transcribed from Ottosson's reference implementation. The reference-value spec and the full sRGB-cube round-trip both still pass, which is what demonstrates the refactor preserved the maths rather than my say-so.
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Inline comments:
In `@spec/companion-theme-contrast.spec.mjs`:
- Line 186: Strengthen the assertion around adjusted.accent by independently
calculating the nearest valid dark OKLCH candidate and verifying that the
returned lightness change matches that candidate within the appropriate
tolerance. Keep the existing contrast-floor assertion and the rgbToOklch
comparisons intact.
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src/ui/oklch.ts (1)
21-66: LGTM!Also applies to: 98-102, 117-121
src/ui/theme-contrast.ts (1)
7-7: LGTM!Also applies to: 56-73, 75-83, 88-89, 91-107
Review finding on this PR. The previous assertion only checked that the adjusted accent came out darker than it started, which would also have passed for a correction that darkened all the way to black -- the exact overshoot the test was supposed to rule out. The expected landing point is now computed in the spec by scanning outward from the origin on a 0.001 grid, both directions, and taking the first lightness that clears the floor. The assertion allows one search step of slack, since the implementation samples a coarser grid and can overshoot the true optimum by at most the step it moves in. The scan derives the optimum without knowing the implementation's step size, so tuning that constant does not silently loosen the test.
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Valid, strengthened in the latest commit. You're right that the assertion was too weak. The expected landing point is now computed in the spec, independently of the implementation: scan outward from the origin on a 0.001 grid, both directions, and take the first lightness that clears 3:1. The assertion allows one search step of slack, since the implementation samples a coarser grid and can overshoot the true optimum by at most the step it moves in. Deriving the optimum by scan rather than from the step constant matters — otherwise tuning Kept the contrast-floor assertion and the direction check alongside it, as you asked.
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Both findings from this review were addressed and answered in a PR comment: the contrast search now covers both directions (a real defect - it could return a colour at 3.00 when 4.5 was required), and the OKLCH coefficients are extracted into four named matrices. Superseded by the later review on the same PR.
Review finding from Codex on this PR, and correct. The correction checked accents and syntax tokens against palette.surface alone, but a token is drawn on more than the workspace background: source-viewer keeps the syntax foreground while the current line repaints the background beneath it, and the settings drawer reuses the comment foreground over the drawer background. So the floor was being met on a surface the token does not always appear on. monokai's light companion reported 3.03:1 on the workspace while rendering at 2.75:1 on the current line and 2.51:1 in the drawer. Both under the 3:1 floor this PR exists to enforce, and both invisible to the spec that shipped with it. Every token is now held against every surface in the palette. Worst ratio across workspace, current line, drawer, header and footer, per companion: graphite-light 3.34 morning-dark 4.42 monokai-light 3.06 dracula-light 3.11 nord-light 3.07 catppuccin-light 3.15 The new spec walks all five rendering surfaces rather than the workspace background only, so a token that clears the floor in one place and fails in another is now a failure rather than a pass.
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Valid, and thank you — this was a real gap I missed. Fixed in the latest commit. You were right on the mechanism and the numbers. The correction was checking accents and syntax tokens against Confirmed independently before changing anything — monokai-light:
So the PR was enforcing a floor on a surface the token doesn't always appear on, and the spec that shipped with it couldn't see the failure. Every token is now held against every surface in the palette. Worst ratio across workspace, current line, drawer, header and footer, per companion: graphite-light 3.34, morning-dark 4.42, monokai-light 3.06, dracula-light 3.11, nord-light 3.07, catppuccin-light 3.15. The spec now walks all five rendering surfaces rather than the workspace background only, so a token that clears the floor in one place and fails in another is a failure rather than a pass.
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…erial lie Three findings from Codex on this PR. All three were real. P1: no built-in scene could be opened. Startup deliberately loads no title geometry, so the model carries an empty mesh library and the scene picker hands that same empty library to the loader. Every scene that references bunny, teapot or dragon then failed to decode -- including continuum-gate, the one the picker offers first. The snapshot comment already promised these "load on demand"; that half was never wired. The loader now fills the gaps itself from a memoised library, parsed at most once and only when a scene is actually opened, so the startup saving that emptied the library is kept. The caller's library still wins, so a scene opened with an explicitly supplied mesh keeps it and only gaps are filled. Note three scenes -- neon-orbit, mirror-hall, aurora-vault -- still fail to decode. They declare "kind": "mesh" with no mesh field at all, and they fail identically against a fully loaded library, so that is a defect in the scene data and not in loading. Filed separately. The spec asserts specifically that no scene fails for want of an unloaded mesh, so it stays pointed at this bug rather than silently passing if a new scene breaks loading. P2: the frame clock billed idle time as one frame. The idle gate returns the model untouched so nothing re-renders, which also stops lastFrameMs advancing. Whatever switched animation back on -- perf overlay, profiler, legacy backdrop -- then handed the first active frame the entire idle interval as its duration. Measured: 30016 ms as a single frame after a 30 second idle. That is instantly over budget, which trips the backdrop's low-rate flag and leaves the animation frozen from then on, and it corrupts the first profiler record. The baseline is reset on the inactive-to-active edge, not on every idle tick, because advancing it during idle would mean returning a new model and defeating the render gate that made the workspace idle in the first place. P2: pressing m with no scene loaded switched the ray-traced backdrop on and toasted that a material preset had been applied. Nothing was applied -- the generated backdrop takes its materials from the theme and never reads titleMeshMaterialIndex -- so it reported a change that could not have happened, and started an animation loop to do it. It now says a scene must be loaded and leaves the backdrop alone. Verified by mutation: restoring the old behaviour fails both new cases. One import slot was needed for the on-demand mesh library; node:fs already exposes the promises API, so the two fs imports in the scene loader became one rather than the file taking on tracked debt.
… the material lie" This reverts commit f44d884.
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Summary
Revives the palette half of #204, which has been unmergeable since July — 15 of its 20 files have since moved on main, so this re-lands the idea against current main rather than rebasing two months of drift.
A companion theme is generated by inverting an authored palette, and inversion is not contrast-preserving. A colour chosen to read against a dark surface can land far too close to the inverted light one:
Authored palettes are deliberately untouched — those are an author's choice, governed by
theme-legibility.spec.mjs. Only palettes jedit generates on the author's behalf are corrected, and only where they fall short.How it differs from #204
#204 blended toward black or white until the ratio was met. That works, but it desaturates as it goes and drags hue with it, so an amber warning arrives washed out and slightly wrong rather than simply lighter. This walks lightness in OKLCH with hue and chroma held, and a spec asserts no token that was chromatic in the authored theme comes out grey.
Also included
src/ui/oklch.ts— sRGB ↔ OKLab/OKLCH from Ottosson's published derivation. Checked against his reference values and round-tripped over the sRGB cube, so a mistyped matrix constant fails loudly. Hand-rolled rather than adding culori, since this is the only colour maths jedit needs.src/ui/theme-contrast.ts.jedit-themes.tsowns what a theme is; this owns whether a colour can be read on the surface behind it. It also keepsjedit-themes.tsunder the 500-line limit, which the addition had pushed it past at 552.Verification
npm run check— 816 tests, 804 pass, 0 fail, quality regressions none.Refs #204, #309