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allow nullable ev100 in CameraContainerBloc

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This commit is contained in:
Vadim 2023-05-05 23:19:24 +02:00
parent 9a21d5f2f5
commit b144cf7edb
1 changed files with 23 additions and 16 deletions
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39
lib/screens/metering/components/camera_container/bloc_container_camera.dart
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@ -34,7 +34,7 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
double _exposureStep = 0.0;
double _currentExposureOffset = 0.0;
double _ev100 = 0.0;
double? _ev100 = 0.0;
CameraContainerBloc(
this._meteringInteractor,
@ -67,12 +67,17 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
@override
void onCommunicationState(communication_states.SourceState communicationState) {
if (communicationState is communication_states.MeasureState) {
_takePhoto().then((ev100Raw) {
if (ev100Raw != null) {
_ev100 = ev100Raw + _meteringInteractor.cameraEvCalibration;
communicationBloc.add(communication_event.MeteringEndedEvent(_ev100));
}
});
if (_canTakePhoto) {
_takePhoto().then((ev100Raw) {
if (ev100Raw != null) {
_ev100 = ev100Raw + _meteringInteractor.cameraEvCalibration;
communicationBloc.add(communication_event.MeteringEndedEvent(_ev100));
} else {
_ev100 = null;
communicationBloc.add(const communication_event.MeteringEndedEvent(null));
}
});
}
}
}
@ -172,23 +177,25 @@ class CameraContainerBloc extends EvSourceBlocBase<CameraContainerEvent, CameraC
);
}
Future<double?> _takePhoto() async {
if (_cameraController == null ||
!_cameraController!.value.isInitialized ||
_cameraController!.value.isTakingPicture) {
return null;
}
bool get _canTakePhoto => !(_cameraController == null ||
!_cameraController!.value.isInitialized ||
_cameraController!.value.isTakingPicture);
Future<double?> _takePhoto() async {
try {
final file = await _cameraController!.takePicture();
final Uint8List bytes = await file.readAsBytes();
Directory(file.path).deleteSync(recursive: true);
final tags = await readExifFromBytes(bytes);
final iso = double.parse("${tags["EXIF ISOSpeedRatings"]}");
final apertureValueRatio = (tags["EXIF FNumber"]!.values as IfdRatios).ratios.first;
final iso = double.tryParse("${tags["EXIF ISOSpeedRatings"]}");
final apertureValueRatio = (tags["EXIF FNumber"]?.values as IfdRatios?)?.ratios.first;
final speedValueRatio = (tags["EXIF ExposureTime"]?.values as IfdRatios?)?.ratios.first;
if (iso == null || apertureValueRatio == null || speedValueRatio == null) {
return null;
}
final aperture = apertureValueRatio.numerator / apertureValueRatio.denominator;
final speedValueRatio = (tags["EXIF ExposureTime"]!.values as IfdRatios).ratios.first;
final speed = speedValueRatio.numerator / speedValueRatio.denominator;
return log2(pow(aperture, 2)) - log2(speed) - log2(iso / 100);