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Interface status: | deprecated |
class CMdaImageDataReadUtility : public CMdaImageUtility;
Base class used in the derivation of CMdaImageDescToBitmapUtility
and CMdaImageFileToBitmapUtility
.
It has no user accessible functions.
Replaced by Image Conversion library - see CImageDecoder
CBase
-
Base class for all classes to be instantiated on the heap.
CActive
-
The core class of the active object abstraction.
CMdaImageUtility
- Defines the public interface to image conversion.
CMdaImageDataReadUtility
- Base class used in the derivation of CMdaImageDescToBitmapUtility and CMdaImageF...
Defined in CMdaImageDataReadUtility
:
CancelConvertL()
Cancels the conversion operation.ConvertL(CFbsBitmap &,CFbsBitmap &,TInt)
Begins the image conversion operation for the specified frame overloaded functio...ConvertL(CFbsBitmap &,TInt)
Begins the image conversion operation for the specified frame overloaded functio...DoCancel()
Implements cancellation of an outstanding request.DoClose()
FrameCommentL(TInt)
Returns a particular comment attached to a given frame of the image This functio...ImageReadUtil_Reserved2()
ImageReadUtil_Reserved3()
ImageReadUtil_Reserved4()
RunL()
Handles an active object's request completion event.~CMdaImageDataReadUtility()
Default destructor. Inherited from CActive
:
CActive(TInt)
Constructs the active object with the specified priority.Cancel()
Cancels the wait for completion of an outstanding request.Deque()
Removes the active object from the active scheduler's list of active objects.EPriorityHigh
A priority higher than EPriorityUserInput.EPriorityIdle
A low priority, useful for active objects representing background processing.EPriorityLow
A priority higher than EPriorityIdle but lower than EPriorityStandard.EPriorityStandard
Most active objects will have this priority.EPriorityUserInput
A priority higher than EPriorityStandard; useful for active objects handling use...Extension_(TUint,TAny *&,TAny *)
Extension function IsActive()const
Determines whether the active object has a request outstanding.IsAdded()const
Determines whether the active object has been added to the active scheduler's li...Priority()const
Gets the priority of the active object.RunError(TInt)
Handles a leave occurring in the request completion event handler CActive::RunL(...SetActive()
Indicates that the active object has issued a request and that it is now outstan...SetPriority(TInt)
Sets the priority of the active object.TPriority
Defines standard priorities for active objects. iStatus
The request status associated with an asynchronous request.Inherited from CBase
:
Delete(CBase *)
Deletes the specified object.operator new(TUint)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TAny *)
Initialises the object to binary zeroes.operator new(TUint,TLeave)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TLeave,TUint)
Allocates the object from the heap and then initialises its contents to binary z...operator new(TUint,TUint)
Allocates the object from the heap and then initialises its contents to binary z...Inherited from CMdaImageUtility
:
Close()
Closes the open file-based or descriptor-based image.FrameCount()const
Returns the number of frames in the image, counting from the first frame in the ...FrameInfo(TInt,TFrameInfo &)const
Retrieves information about the specified frame.ImageUtil_Reserved1()
ImageUtil_Reserved2()
ImageUtil_Reserved3()
ImageUtil_Reserved4()
MoscoStateChangeEvent(CBase *,TInt,TInt,TInt)
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual ~CMdaImageDataReadUtility();
Default destructor.
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
IMPORT_C virtual void ConvertL(CFbsBitmap &aBitmap, TInt aFrameNumber=0);
Begins the image conversion operation for the specified frame overloaded function.
The operation is asynchronous. When the conversion operation is complete, successfully or otherwise, the callback function
MMdaImageUtilObserver::MiuoConvertComplete(TInt)
is called.When converting from a file or descriptor to a bitmap, the operation can complete with KErrUnderflow, if there
is insufficient information in the file or descriptor. Typically, this occurs when using the file or descriptor as a cache.
In this situation, the conversion operation should be performed repeatedly until the file or descriptor has accumulated enough
information for the operation to complete with KErrNone. As much of the image as is present is converted and written to the
target bitmap at each call to this function.
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Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
IMPORT_C virtual void ConvertL(CFbsBitmap &aBitmap, CFbsBitmap &aMaskBitmap, TInt aFrameNumber=0);
Begins the image conversion operation for the specified frame overloaded function.
The operation is asynchronous. When the conversion operation is complete, successfully or otherwise, the callback function
MMdaImageUtilObserver::MiuoConvertComplete(TInt)
is called.When converting from a file or descriptor to a bitmap, the operation can complete with KErrUnderflow, if there
is insufficient information in the file or descriptor. Typically, this occurs when using the file or descriptor as a cache.
In this situation, the conversion operation should be performed repeatedly until the file or descriptor has accumulated enough
information for the operation to complete with KErrNone. As much of the image as is present is converted and written to the
target bitmap at each call to this function.
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CMdaImageUtility::ConvertL(CFbsBitmap &,TInt)
Begins the image conversion operation for the specified frame overloaded functio...CFbsBitmap
Note that this class is not intended for user derivation. A bitmap managed by th...Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
IMPORT_C virtual void CancelConvertL();
Cancels the conversion operation.
The callback function MMdaImageUtilObserver::MiuoConvertComplete(TInt)
is not called.
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual void RunL();
Handles an active object's request completion event.
A derived class must provide an implementation to handle the completed request. If appropriate, it may issue another request.
The function is called by the active scheduler when a request completion event occurs, i.e. after the active scheduler's WaitForAnyRequest() function completes.
Before calling this active object's CMdaImageDataReadUtility::RunL()
function, the active scheduler has:
1. decided that this is the highest priority active object with a completed request
2. marked this active object's request as complete (i.e. the request is no longer outstanding)
CMdaImageDataReadUtility::RunL()
runs under a trap harness in the active scheduler. If it leaves, then the active scheduler calls CActive::RunError(TInt)
to handle the leave.
Note that once the active scheduler's Start() function has been called, all user code is run under one of the program's active
object's CMdaImageDataReadUtility::RunL()
or CActive::RunError(TInt)
functions.
CActiveScheduler::Start()
Starts a new wait loop under the control of the current active scheduler.CActiveScheduler::Error(TInt)const
Handles the result of a leave occurring in an active object’s RunL() function.CActiveScheduler::WaitForAnyRequest()
Wait for an asynchronous request to complete.Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual void DoCancel();
Implements cancellation of an outstanding request.
This function is called as part of the active object's CActive::Cancel()
.
It must call the appropriate cancel function offered by the active object's asynchronous service provider. The asynchronous service provider's cancel is expected to act immediately.
CMdaImageDataReadUtility::DoCancel()
must not wait for event completion; this is handled by CActive::Cancel()
.
CActive::Cancel()
Cancels the wait for completion of an outstanding request.Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
IMPORT_C virtual const TDesC& FrameCommentL(TInt aFrameNumber);
Returns a particular comment attached to a given frame of the image This function has been superceded by the parallel one
in CImageDecoder
, as this assumes that each frame has a comment within it, which is not always the case.
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Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual void ImageReadUtil_Reserved2();
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual void ImageReadUtil_Reserved3();
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
virtual void ImageReadUtil_Reserved4();
Interface status: | deprecated | Inherited from: CMdaImageDataReadUtility |
protected: virtual void DoClose();