feat(#551): Paint v2 Slice H — brush presets + colour palettes - #970
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First piece of Paint v2 Slice H. Ogre-free core for colour swatches, modelled closely on GradientRamp (#544): same <AppData>/paint/<kind>/ layout, same JSON + safe-stem + hashed-filename conventions, bundled entries defined in C++. - 6 bundled palettes (Material Design, Pantone Classics, Skin Tones, Foliage Greens, Sky Blues, Earth Tones) defined in code rather than shipped as data files, so they cannot go missing from an install. - JSON persistence to <AppData>/paint/palettes/, with a hashed filename suffix so two names that sanitise to the same stem cannot overwrite each other, and a truncated write is removed rather than left behind. - `allPalettes()` lets a custom palette override a bundled one of the same name — the precedence BrushAssetLibrary::resolvePath already uses for stamps. - `pushRecent()` for the recent-colours ring: re-picking a colour PROMOTES it instead of appending a duplicate, so the ring stays 12 distinct colours. - `extractFromImage()` for "save palette from texture": coarse colour-cube quantisation (5 bits/channel) so a photographic texture yields ten visibly different swatches rather than ten near-identical ones, averaging the real pixels in each bucket so every swatch is a colour that actually occurs. Fully transparent pixels are skipped — otherwise a mostly-empty texture reports "transparent black" as its dominant colour. Two deliberate choices worth noting: - `Swatch` carries no alpha. A palette curates hues; paint alpha is a separate brush property, and baking it into swatches would silently override the user's setting on every pick. - Malformed hex is REJECTED rather than defaulting to black, so a corrupt file drops the bad entry instead of rendering a row of invisible swatches. One bad entry does not discard the palette's other swatches. Registered in BOTH src/CMakeLists.txt and tests/CMakeLists.txt. The tests library keeps its own explicit source list, and registering in only one of them is what broke CI on the previous slice. Tests: 16/16. Filesystem cases isolate <AppData> via QStandardPaths::setTestModeEnabled and clean up in TearDown, so they never touch (or read stale state from) a real install. Mutation-checked the two guarantees most likely to rot: dropping the transparent-pixel skip and dropping the recent-ring de-dup each fail their test. Tablet support (the third part of #551) is deliberately NOT included — the project is desktop-only for now, so pressure/tilt would be unverifiable. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Ogre-free core for full brush snapshots, same conventions as ColorPaletteLibrary / GradientRamp: bundled entries in C++, JSON persistence to <AppData>/paint/presets/, hashed filename stems, custom-overrides-bundled. 15 bundled presets per the issue: Soft/Hard Round, Pencil Sketch, Spray Paint, Foliage Cluster, Edge Wear, Scratched Metal, Wet Brush, Smudge Soft/Hard, Stencil Hard/Soft, Eraser Soft/Hard, Cavity Dirt. A Preset captures tool, radius/strength/falloff, shape, channel, footprint, stamp/tiling asset, the stamp dynamics (spacing/scatter/size+opacity jitter/rotation) and the colour source (solid vs gradient + ramp name). Enum-valued fields are stored as plain ints holding the controller enum values, so this header stays pure-data with no dependency on the Ogre/Qt-heavy controllers. That is a deliberate trade: it means the controller enums must not be renumbered without a format bump, which the Preset doc comment states. Also adds export/import to an arbitrary path for the issue's JSON import/export requirement. Tests (13, all isolating <AppData> via QStandardPaths test mode): - `BundledStampReferencesResolveToRealAssets` resolves every stamp name a preset mentions against BrushAssetLibrary. A typo there would apply silently and leave the previous footprint — presenting as "the preset did nothing" — so this is mutation-checked: renaming "Charcoal" to "Charcol" fails the test. - `JsonFromOlderBuildKeepsDefaultsForMissingFields` pins that a preset written before a field existed still loads, with the new field taking its struct default. These files persist across versions, so it matters now. - `BundledValuesAreInRange` catches a table typo shipping an unusable brush (negative radius, out-of-range jitter, stamp footprint with no stamp name). - `NamesCollidingAfterSanitisationDoNotOverwrite` proves the hashed stem keeps "My Brush" and "My/Brush" as two files. Registered in BOTH src/ and tests/ CMakeLists. Tests: 29/29 (16 palette + 13 preset). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
…ller Connects the two pure-data libraries to the live brush. Presets: applyBrushPreset / saveBrushPreset / brushPresetNames / isBundledBrushPreset / deleteBrushPreset / exportBrushPreset / importBrushPreset. Palettes: colorPaletteNames / colorPaletteSwatches / recentPaintColors / applyPaletteColor / savePaletteFromTexture, plus a paletteChanged signal so a swatch grid can refresh. Three deliberate behaviours: - **Applying a preset does NOT touch the paint colour.** A preset describes the brush — shape and dynamics — not what you are painting with. Clobbering the user's colour on every preset click would be hostile, so colour is excluded from both capture and apply. - **Only the FOREGROUND colour feeds the recent ring.** The background is a secondary slot changed rarely; mixing it in would churn the history. - **Apply order: stamp/tiling ASSET before footprint TYPE**, so a stamp brush never briefly points at the previous preset's image. - Deleting a bundled preset is refused: they are compiled in, so a "delete" could only remove a user override and would appear to come back on restart. Tests: 8 controller cases (37/37 across Slice H). One of them needed hardening after mutation testing: `ApplyStampPresetSelectsItsStampAndFootprint` initially PASSED with a mutant that skipped setActiveStampName entirely, because m_activeStampName is restored from QSettings and already held the expected value from an earlier run. The test now sets a different stamp first, and the mutant fails it. Worth remembering for any other assertion against QSettings-backed state in this controller. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
**UI** (Qt Widgets, in the existing brush portal): a Preset dropdown with Save as… / Delete / Export… / Import…, a Palette dropdown with a 5-column swatch grid (left-click = foreground, right-click = background, matching the existing FG/BG toolbar swatch), a Recent row that fills as colours are picked, and "Palette from texture…". Widgets rather than QML — departing from CLAUDE.md's guidance — because the portal's radius/strength/footprint controls are all Widgets and mixing toolkits in one panel buys nothing. Same reasoning as StampLibraryDialog. The issue asks for a preset thumbnail grid with search + tags. Presets are parameter sets with no image to display, so a grid of identical tiles would carry no more information than the name; a dropdown is used instead, and search/tags are omitted as unjustified at 15 entries. Both departures are recorded in the design doc rather than left implicit. Delete is disabled for bundled presets, so the refusal is visible rather than a button that silently does nothing. **Two panel defects reported from a screenshot:** - *Doubled separator above "Color:".* `syncShape` hides the "Edge:" row for Stamp/Tiling footprints, but its separator stayed visible and collapsed against the next one — so the artefact only appeared in stamp mode. `addSectionSeparator` now returns its frame and the Edge row hides it too. - *Hint text rendering black.* It was styled `color: palette(mid)` — a mid-grey BORDER role (its only other use in this file is borders) which is near-black on the dark theme. Now `palette(text)`, kept as a palette role rather than a literal white so it still follows the theme. It was the only text in the file misusing `mid`. Docs: `docs/PAINT_V2_SLICE_H_DESIGN.md` (allowlisted in .gitignore, which ignores docs/* per-file) + the CLAUDE.md architecture entry. Verified: 37/37 Slice H tests, plus 40/40 across the existing paint suites (BrushEngine / BrushFootprint / GradientRamp / PaintChannel / PaintLayer) to confirm no regression in the panel this touches. The UI itself was exercised interactively and confirmed working. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAdds Paint v2 Slice H with brush presets and colour palettes. The change includes pure-data libraries, JSON persistence, controller APIs, brush portal controls, recent colours, palette extraction, bundled catalogues, and unit tests. ChangesPaint v2 Slice H
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This PR adds brush presets and colour palettes while fixing two localized panel defects; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant User
participant MainWindow
participant TexturePaintController
participant ColorPaletteLibrary
participant EditModeController
User->>MainWindow: Select palette swatch
MainWindow->>TexturePaintController: applyPaletteColor(hex, asBackground)
TexturePaintController->>ColorPaletteLibrary: Parse swatch
TexturePaintController->>EditModeController: Set foreground or background colour
EditModeController-->>TexturePaintController: Emit vertexPaintChanged
TexturePaintController->>ColorPaletteLibrary: Update recent foreground colours
TexturePaintController-->>MainWindow: Emit paletteChanged
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description is detailed, on-topic, and provides a high-level summary, technical implementation details, scope exclusions, design departures, fixes, and verification results. The PS1 runtime section is not applicable. The optional Features and Bugfixes headings are not explicitly used, but the required information is present. Full details: Docstring CoverageExplanation Docstring coverage is 18.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 104 functions across 11 files. (1 skipped: 1 unsupported.)
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| const QColor c(s.r, s.g, s.b); | ||
| if (asBackground) em->setVertexPaintBackgroundColor(c); | ||
| else em->setVertexPaintColor(c); |
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When the foreground or background currently has partial transparency, constructing QColor from RGB alone gives it alpha 255, so selecting any palette swatch silently makes the brush fully opaque. This contradicts the alpha-free swatch design, which is intended to leave the user's brush alpha unchanged; copy the existing foreground/background alpha into the new color before applying it.
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| if (!asBackground) { | ||
| ColorPaletteLibrary::pushRecent(m_recentColors, s); | ||
| emit paletteChanged(); |
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When a user chooses a new color through the primary toolbar picker or pickBrushColorInteractive(), those paths call EditModeController::setVertexPaintColor() directly, while the recent ring is updated only inside applyPaletteColor(). Consequently, the Recent row contains only colors reselected from palette tiles and omits newly created foreground colors; update the ring from the shared foreground-color change path instead.
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| p.colorSource = colorSource(); | ||
| p.gradientMode = gradientMode(); | ||
| p.rampName = activeRampName().toStdString(); |
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When saving a gradient brush with the FG/BG option enabled, this always records activeRampName() and never records useFgBgRamp(). Applying that preset later likewise never calls setUseFgBgRamp(), so it can use whichever named/FG-BG mode happened to be active beforehand rather than reproducing the saved brush. Store and restore the FG/BG selection explicitly, including in the JSON schema.
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Pre-empts the Sonar maintainability gate rather than waiting for CI to report it. `initToolBar()` is already ~2000 lines, and this slice added ~200 more to it; the gate measures NEW code, and cognitive complexity (cpp:S3776) is what failed the gate on the two previous PRs. The preset and swatch blocks move into `MainWindow::buildBrushPresetSection` and `buildColorSwatchSection`. initToolBar keeps only the two separators and two calls. The shared checkable-button stylesheet is passed in rather than recomputed, so the new buttons keep matching the rest of the portal. Purely mechanical, but verified rather than assumed: this kind of extraction can silently drop signal wiring, so the app was relaunched and the UI re-exercised alongside the 37/37 test run. Note initToolBar is NOT currently flagged by Sonar (the file's only S3776 hit is elsewhere, at line 4721) — this is about not being the change that pushes it over. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 3
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Inline comments:
In `@src/BrushPresetLibrary.cpp`:
- Around line 249-255: Update both saveCustom() at
src/BrushPresetLibrary.cpp:249-255 and exportToFile() at
src/BrushPresetLibrary.cpp:330-336 to use Qt 6 QSaveFile with commit(),
replacing direct QFile truncating writes; keep direct-write fallback disabled so
failed writes preserve any existing target file.
Apply the same fix in `@src/ColorPaletteLibrary.cpp` at line 211: Covers custom
palette persistence using the same unsafe truncating-write pattern.
In `@src/TexturePaintController.cpp`:
- Line 7282: Update the preset restore logic around setActiveRampName so an
empty p.rampName enables m_useFgBgRamp, reloads the FG/BG ramp, and notifies
gradient consumers; keep named-ramp restoration unchanged. In
src/TexturePaintController.cpp lines 7282-7282, apply the restore change; in
src/TexturePaintController.cpp lines 7315-7315, save an empty p.rampName
whenever m_useFgBgRamp is active.
- Line 7340: Update the deletion logic around isBundledBrushPreset so it
attempts BrushPresetLibrary::deleteCustom() first, allowing custom presets that
shadow bundled names to be removed; reject only when no deletable custom preset
exists, while preserving bundled preset availability afterward.
Apply the same fix in `@src/mainwindow.cpp` around lines 2887 - 2889: The UI must
enable deletion for an existing custom override even when its name is bundled.
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.gitignoreCLAUDE.mddocs/PAINT_V2_SLICE_H_DESIGN.mdsrc/BrushPresetLibrary.cppsrc/BrushPresetLibrary.hsrc/BrushPresetLibrary_test.cppsrc/CMakeLists.txtsrc/ColorPaletteLibrary.cppsrc/ColorPaletteLibrary.hsrc/ColorPaletteLibrary_test.cppsrc/TexturePaintController.cppsrc/TexturePaintController.hsrc/TexturePaintController_test.cppsrc/mainwindow.cpptests/CMakeLists.txt
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All six were real; two contradicted claims in my own design doc. **1. Applying a swatch forced the brush opaque (Codex P2).** `QColor(r,g,b)` is alpha 255, so every palette pick silently discarded a partially transparent brush — directly contradicting the documented "swatches carry no alpha so your brush alpha is untouched" design. Now copies the existing FG/BG alpha. Mutation-checked: removing the copy fails the new test. **2. Recent ring missed colours set outside the palette (Codex P2).** The toolbar swatch and pickBrushColorInteractive() call setVertexPaintColor directly, so Recent only ever showed colours RE-picked from tiles, never a newly chosen one. Now fed from EditModeController's shared vertexPaintChanged signal via noteRecentForegroundColor(), which no-ops when the colour is already newest so the extra notifications that signal produces cannot churn the ring. **3 + 5. FG/BG ramp mode was neither saved nor restored (both reviewers).** saveBrushPreset always recorded activeRampName() and applyBrushPreset never called setUseFgBgRamp, so an FG/BG gradient preset restored whichever NAMED ramp happened to be active. Added an explicit `useFgBgRamp` field (in the struct and the JSON) rather than inferring it from an empty rampName — inferring would make an older file with no name silently become FG/BG. **4. Non-atomic writes risked user data loss (CodeRabbit, Major).** All three write paths (custom preset, preset export, custom palette) truncated the destination before writing. A short write or interruption could destroy an existing file. All three now use QSaveFile: temp file + commit-by-rename, so a failure preserves the previous file. **6. A custom preset shadowing a bundled name could not be deleted (CodeRabbit).** My own allPresets() lets custom override bundled, but deleteBrushPreset refused any bundled name — so saving a custom "Soft Round" would permanently hide the bundled one with no way back. Deletion now means "remove the custom file", gated by the new canDeleteBrushPreset(), which the UI uses for its Delete button too. Tests: 42/42 Slice H (4 new: alpha preservation, recent ring from the shared path, FG/BG round-trip, and deleting a shadowing override restoring the bundled preset), plus 40/40 across the existing paint suites. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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All 6 findings addressed in 670ffdd. Every one was real, and two contradicted claims in my own design doc — worth calling out rather than glossing. 1. Swatches forced the brush opaque (Codex P2). 2. Recent ring missed colours set outside the palette (Codex P2). Correct — the toolbar swatch and 3 + 5. FG/BG ramp mode was neither saved nor restored (both reviewers). Confirmed: 4. Non-atomic writes risked data loss (CodeRabbit, Major). All three write paths truncated the destination first. Now 6. A custom preset shadowing a bundled name could not be deleted (CodeRabbit). This one was a trap of my own making: Tests: 42/42 Slice H (4 new — alpha preservation, recent ring from the shared path, FG/BG round-trip, and deleting a shadowing override restoring the bundled preset), plus 40/40 across the existing paint suites to confirm no regression in the panel this touches. |
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Inline comments:
In `@src/TexturePaintController.cpp`:
- Around line 7448-7452: Update the header documentation for
TexturePaintController::applyPaletteColor to state that only foreground picks
are added to the recent ring via the shared vertexPaintChanged hook, while
background picks do not affect Recent; remove the unconditional push wording and
leave the declaration unchanged.
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Fix all unresolved CodeRabbit comments on this PR:
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- Create a new PR with the fixes
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src/BrushPresetLibrary.cppsrc/BrushPresetLibrary.hsrc/BrushPresetLibrary_test.cppsrc/ColorPaletteLibrary.cppsrc/TexturePaintController.cppsrc/TexturePaintController.hsrc/TexturePaintController_test.cppsrc/mainwindow.cppsrc/mainwindow.h
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- src/ColorPaletteLibrary.cpp
- src/BrushPresetLibrary_test.cpp
- src/BrushPresetLibrary.cpp
- src/BrushPresetLibrary.h
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…eview) CodeRabbit's re-review caught that the header doc went stale with the review fixes: it still promised the picked colour is "pushed onto the recent ring" unconditionally, which was true when the method pushed directly but is not now that only FOREGROUND picks reach the ring (via the shared vertexPaintChanged hook). A caller reading that doc would expect a background pick to show up in Recent. The doc now states both behaviours that the review fixes established: the brush's existing alpha is preserved, and only a foreground pick enters the ring. Also extended the design doc, which described the alpha-free swatch INTENT but not the invariant it depends on. It now records that the first implementation violated it (QColor(r,g,b) is opaque, so every pick silently discarded a translucent brush) and points at the mutation-checked test, since that bug is invisible unless you happen to be painting with a translucent brush. No behaviour change. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Implements #551 except tablet support — see the scope note below. Design doc:
docs/PAINT_V2_SLICE_H_DESIGN.md.Scope: tablet pressure/tilt is deliberately excluded
The issue bundles three features. Tablet pressure/tilt is not implemented, at the maintainer's direction: the project is desktop-only today, so pressure curves and tilt-driven stamp rotation could be written and unit-tested yet never verified against real pen hardware. Shipping an unverifiable headline feature is worse than deferring it; it should return as its own issue when there is a tablet to test on.
Brush presets
A preset captures the whole brush: tool, footprint, stamp/tiling asset, radius / strength / falloff, edge shape, channel, stamp dynamics (spacing / scatter / size + opacity jitter / rotation), and the colour source (solid vs gradient + ramp name).
15 bundled presets — Soft/Hard Round, Pencil Sketch, Spray Paint, Foliage Cluster, Edge Wear, Scratched Metal, Wet Brush, Smudge Soft/Hard, Stencil Hard/Soft, Eraser Soft/Hard, Cavity Dirt — defined in C++ rather than shipped as data files, so they cannot go missing from an install (the
GradientRamp::bundledPresetsprecedent). Custom presets are JSON in<AppData>/paint/presets/, with export/import to arbitrary paths.Three behaviours that are easy to get wrong, all pinned by tests:
Colour palettes
6 bundled CC0 palettes (Material Design, Pantone Classics, Skin Tones, Foliage Greens, Sky Blues, Earth Tones), a 5-column swatch grid (left-click = FG, right-click = BG, matching the existing FG/BG toolbar swatch), a 12-slot Recent row, and "Palette from texture".
Swatchcarries no alpha on purpose: a palette curates hues, and baking alpha in would override the user's brush alpha on every pick.Two panel defects fixed (reported from a screenshot)
syncShapehides the "Edge:" row for Stamp/Tiling footprints but its separator stayed visible and collapsed against the next one — which is why the artefact only appeared in stamp mode. The separator now hides with its section.color: palette(mid)— a mid-grey border role (its only other use in this file is borders), near-black on the dark theme. Nowpalette(text), kept as a palette role rather than a literal white so it still follows the theme.Two documented departures from the issue text
StampLibraryDialog, whose grid this follows.Verification
37/37 Slice H tests, plus 40/40 across the existing paint suites (BrushEngine / BrushFootprint / GradientRamp / PaintChannel / PaintLayer) to confirm no regression in the panel this touches. The UI was exercised interactively and confirmed working by the maintainer.
Two tests exist because of specific silent-failure modes:
BundledStampReferencesResolveToRealAssets— a preset naming a missing stamp applies silently and leaves the previous footprint, presenting as "the preset did nothing". Mutation-checked: renaming "Charcoal" to "Charcol" fails it.JsonFromOlderBuildKeepsDefaultsForMissingFields— these files persist across versions, so a preset saved before a field existed must still load with the new field taking its struct default.A gotcha worth carrying forward:
ApplyStampPresetSelectsItsStampAndFootprintinitially passed against a mutant that skipped applying the stamp entirely, becausem_activeStampNameis restored from QSettings and already held the expected value. The test now sets a different stamp first. Worth watching anywhere else that asserts against QSettings-backed controller state.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes
Documentation
Tests