Background Processing for Ecam

This topic describes how to capture an image using standalone background processing in Ecam.

1. 
   To prepare image capturing using the CCamera API
   1. Call CCamera::CCameraPreImageCaptureControl::GetSupportedProcessingOptionsL(TUint& aECamProcessingOptionsSupported) const to get support for processing specified by TECamProcessingTypes .
   2. 
      Pass the EECamBackgroundProcessing option instead of the SetImageProcessingOptions value within the TPrepareImageParameters values to the required processing option specified in TECamProcessingOptions for the background processing.
   3. 
      Call CCamera::CCameraPreImageCaptureControl::PrepareImageCapture(const CCameraPreImageCaptureControl::TPrepareImageParameters&, MCaptureImageObserver&) to perform setup and allocation of memory for the image capture operation. This implementation creates a new CCameraImageCapture() object which internally implements the MCameraImageCapture() interface. If an error occurs while preparing an image, call MPreImageCaptureControlObserver::PrepareImageComplete(CCamera::CCameraImageCapture *,TInt) to pass the aErrorCode value to CCamera .
2. 
   Call CCamera::CCameraImageCapture::CaptureImage() to capture an image. This implements MCameraImageCapture .
3. 
   Call CCamera::CCameraPostImageCaptureControl::CreateL(CCameraImageCapture*, TPostCaptureControlId) if you wish to capture another image. The CCameraPostImageCaptureControl object from the previous capture is preserved. This callback function creates a CCameraPostImageCaptureControl object for every individual image captured.
4. 
   Call MCaptureImageObserver::IndividualImageControlHandle(CCamera::CCameraImageCapture &,TPostCaptureControlId) to destroy the individual captured image.
5. 
   Call CCamera::CCameraPostImageCaptureControl::~CCameraPostImageCaptureControl() to destroy any captured image objects created by CCameraPostImageCaptureControl::CreateL() .
6. 
   Call CCamera::CCameraImageCapture::PauseProcessing(TUint) to pause any processing options associated with the relevant image capture function. Note: You can call PauseProcessing() for any processing options used during image capture.
7. 
   Call CCamera::CCameraImageCapture::ResumeProcessingL(TUint) to resume any processing options associated with the relevant image capture function. Note: You can call ResumeProcessingL() for any processing options used during image capture.
8. 
   Call CCamera::CCameraPostImageCaptureControl::GetImageStateL(TImageState &)const to retrieve the image state of the individual image given by the CCameraPostImageCaptureControl object.