Akiba So
682907614d
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Zoom flicker root cause (from the on-device badnote_input_log.txt): the pinch
computed its per-frame scale change as desiredScale / getMaxScaleOnAxis(), i.e.
it fed the LIVE matrix back into its own update. Consecutive frames in the log
show `cur` (the live read) dropping to 0.75-0.89 for a single frame while the
result track stayed smooth, so the code demanded a 1.3-1.4x correction that
popped the zoom bigger/smaller and snapped back. The >1.4 glitch guard missed it
because the spikes sat at 1.31-1.40.
Fix: the scale branch of PenInteractiveViewer now drives the transform
ABSOLUTELY from a gesture-start snapshot (_scaleStart, _referenceFocalPoint) plus
the recognizer's clean, monotonic cumulative details.scale. Each frame is fully
re-derived in closed form (pure scale+translate, no matrix inversion, no live
read-back), so a transient mis-read or interleaved write cannot survive into the
next frame. The per-frame glitch guard now keys on the recognizer's own
scale-ratio (the true finger motion) instead of the corrupted live read. 2-finger
pan still falls out of the same focal-anchor formula.
Pen feel: lower perfect_freehand streamline 0.5 -> 0.32 (new shared constants
kPenStreamline/kPenSmoothing, single-sourced across screen + export so the
parity test still holds). At 0.5 a quick flick lagged so far behind the pen that
short fast strokes collapsed toward their start and rendered as a dot
("写字识别成单击"); 0.32 tracks the real path for a crisper, lower-latency feel.
flutter analyze lib/editor clean; 66/66 tests pass (incl. screen==export parity).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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66 lines
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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.build/
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.buildlog/
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.history
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.svn/
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.swiftpm/
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migrate_working_dir/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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**/ios/Flutter/.last_build_id
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.dart_tool/
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.flutter-plugins-dependencies
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.pub-cache/
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.pub/
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/build/
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/coverage/
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# Symbolication related
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app.*.symbols
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# Obfuscation related
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app.*.map.json
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# Android Studio will place build artifacts here
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/android/app/debug
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/android/app/profile
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/android/app/release
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# OMC orchestration state
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.omc/
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# Python server artifacts
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server/.venv/
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server/.omc/
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**/__pycache__/
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*.py[cod]
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.pytest_cache/
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server/data/
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server/*.db
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server/.env
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# M1 spike generated bench assets (regenerate via tool/gen_*.dart)
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/test/assets/large_300p.pdf
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/test/assets/dense_strokes.json
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# On-device input diagnostic capture (local only)
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badnote_input_log.txt
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