This tutorial describes how to perform continuous digital zooming using the Ecam API.
For advanced camera settings, the continuous digital zooming API provides a greater control over continuous zoom by allowing you to specify the speed and acceleration of each continuous zoom operation. The minimum speed for zooming is zero and the minimum acceleration is a negative value (which means deceleration).
For continuous zooming, you need to provide a concrete implementation of [[[ERROR: [NOKX000E] Unable to find definition for key reference 'CCamera']]]MCameraContinuousZoom.
Before you start you should understand the following topics:
CCameraAdvancedSettings::NewL(CCamera&) to create a [[[ERROR: [NOKX000E] Unable to find definition for key reference 'CCamera']]]CCameraAdvancedSettings object. CCameraAdvancedSettings::GetSupportedContinuousZoomTypeL(TUint&) to retrieve supported continuous zoom options for CCameraAdvancedSettings. CCameraAdvancedSettings::CreateContinuousZoomL(MContinuousZoomObserver&,
TContinuousZoomType, CCameraContinuousZoom*&) to create a continuous zoom object. CCameraContinuousZoom::GetContinuousZoomSupportInfoL(CCameraAdvancedSettings::TContinuousZoomSupportInfo&) to retrieve information about the supported settings related to continuous zoom. CCameraAdvancedSettings::StartContinuousZoomL(CCameraAdvancedSettings::TContinuousZoomParameters) to start the continuous zoom operation. CCameraContinuousZoom::ContinuousZoomProgress(CCameraContinuousZoom&,
TInt, TInt) function when a new zoom factor has achieved during the current continuous zoom operation. CCameraAdvancedSettings::GetContinuousZoomId
(TInt aZoomId) function when you use more than one continuous zoom operation. This function is used to retrieve a unique ID which you can use to determine the callback function (like ContinuousZoomProgress() or ContinuousZoomCompleted()) is associated with which continuous zoom object. CCameraContinuousZoom::ContinuousZoomCompleted() to inform you that the continuous zoom function has either completed successfully or to report an error that has caused the operation to fail. Note: This callback function does not actually stop the continuous zoom. CCameraAdvancedSettings::StopContinuousZoom() to stop continuous zooming, if the continuous zoom function has not already completed. The following example shows you how to perform continuous digital zooming using the Ecam API:
CCamera* camera;
MCameraObserver2* observer2;
Camera = CCamera::New2L(*observer2, 0);
CCamera::CCameraAdvancedSettings* settings = CCamera::CCameraAdvancedSettings::NewL(*camera);
TUint supportedContinuousZoomType;
settings->GetSupportedContinuousZoomTypeL(supportedContinuousZoomType);
CCamera::CCameraAdvancedSettings::TContinuousZoomType continuousZoomType =
CCamera::CCameraAdvancedSettings::EContinuousZoomMixed;
MContinuousZoomObserver* continuousZoomObserver;
CCamera::CCameraContinuousZoom* continuousZoom = NULL;
settings->CreateContinuousZoomL(*continuousZoomObserver, continuousZoomType, continuousZoom);
CCamera::CCameraAdvancedSettings::TContinuousZoomSupportInfo info;
continuousZoom->GetContinuousZoomSupportInfoL(info);
CCamera::CCameraAdvancedSettings::TContinuousZoomParameters param;
param.iContinuousZoomType = continuousZoomType;
param.iContinuousZoomAcceleration = 0;
param.iContinuousZoomSpeed = 1;
param.iContinuousZoomLimit = 5;
param.iZoomDirection = CCamera::CCameraAdvancedSettings::EZoomDirectionWide;
continuousZoom->StartContinuousZoomL(param);