Zone threshold fields (MinAlarmPixels, MaxAlarmPixels, MinFilterPixels,
MaxFilterPixels, MinBlobPixels, MaxBlobPixels) were being corrupted on
every save because the PHP conversion used monitor pixel area instead of
zone pixel area. This caused values to inflate progressively, breaking
motion detection.
The fix changes the storage model: thresholds are now stored as
percentages of zone area (DECIMAL(7,2) columns) matching the percentage
coordinate system from zm_update-1.39.2. The C++ Zone::Load() converts
percentages to pixel counts at runtime using polygon.Area(). Legacy
pixel-coordinate zones pass through unchanged.
JS changes:
- submitForm() converts to percentages when in Pixels display mode
- Init skips applyZoneUnits() since DB values are already percentages
- limitRange() only updates field.value when constrained value differs,
preventing oninput from stripping decimal points mid-keystroke
fixes#4690
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
29d371313a