Preview coordinate mapping + Object Detector example (0.0.6) - #4
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CameraController.previewRectFromFrame(rect, sourceRotationDegrees:) converts a normalized box from a frame's coordinate space into preview-display space, accounting for the live previewRotation and the front-camera mirror. The preview rotation and frame orientation are tracked independently, so ML overlays drawn without this drift as the device turns. Adds a unit test + README section. (0.0.6)
FFI frame pipeline → YUV→RGB preprocessing → on-device EfficientDet-Lite0 (90 COCO classes) in a background isolate → labelled boxes via previewRectFromFrame, plus a cat-certainty voting trigger. Bundled model is git-tracked but .pubignored from the published package. Adds kotlin.jvm.target.validation.mode=warning for tflite_flutter.
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CameraController.previewRectFromFrame(rect, sourceRotationDegrees:)— maps a normalized detection box from a frame's coordinate space into preview-display space (rotation + front mirror), so ML overlays track the preview at any device orientation. Root cause: the preview rotation and frame orientation are tracked independently (verified on-device:previewRotationstays display-locked whileframe.orientationfollows the physical angle).Example: a real-time Object Detector page drives EfficientDet-Lite0 (90 COCO classes) over the FFI frame pipeline in a background isolate, with labelled boxes + a cat-certainty trigger. Device-verified on Pixel 8 (detection + boxes tracking through rotation). Both platforms build; 14 unit tests pass.