| 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
| Public Member Functions | |
|---|---|
| ~CMdaImageDataReadUtility() | |
| IMPORT_C void | CancelConvertL() |
| IMPORT_C void | ConvertL(CFbsBitmap &, TInt) |
| IMPORT_C void | ConvertL(CFbsBitmap &, CFbsBitmap &, TInt) |
| void | DoCancel() |
| IMPORT_C const TDesC & | FrameCommentL(TInt) |
| void | ImageReadUtil_Reserved2() |
| void | ImageReadUtil_Reserved3() |
| void | ImageReadUtil_Reserved4() |
| void | RunL() |
| Protected Member Functions | |
|---|---|
| void | DoClose() |
| void | DoOpenL() |
| Private Member Functions | |
|---|---|
| CMdaImageDataReadUtilityPriv * | Properties() |
| Inherited Enumerations | |
|---|---|
| CActive:TPriority | |
| Inherited Attributes | |
|---|---|
| CActive::iStatus | |
| CMdaImageUtility::iProperties | |
| IMPORT_C void | CancelConvertL | ( | ) | [virtual] |
Cancels the conversion operation.
The callback function MMdaImageUtilObserver::MiuoConvertComplete() is not called.
| IMPORT_C void | ConvertL | ( | CFbsBitmap & | aBitmap, |
| TInt | aFrameNumber = 0 | |||
| ) | [virtual] | |||
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() 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.
| CFbsBitmap & aBitmap | A reference to a bitmap. This may be a source or a target for the conversion process, depending on the concrete conversion class utility being used. |
| TInt aFrameNumber = 0 | The frame number. This value is relative to zero. For those concrete conversion classes which perform conversion from a bitmap, this value must always be zero. For those concrete conversion classes which perform conversion to a bitmap, this value must be less than the number of frames in the image. |
| IMPORT_C void | ConvertL | ( | CFbsBitmap & | aBitmap, |
| CFbsBitmap & | aMaskBitmap, | |||
| TInt | aFrameNumber = 0 | |||
| ) | [virtual] | |||
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() 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.
CMdaImageUtility::ConvertL(CFbsBitmap& aBitmap,TInt aFrameNumber = 0)
| CFbsBitmap & aBitmap | A reference to a bitmap. This may be a source or a target for the conversion process, depending on the concrete conversion class utility being used. |
| CFbsBitmap & aMaskBitmap | A source or target mask bitmap, if present. |
| TInt aFrameNumber = 0 | The frame number. This value is relative to zero. For those concrete conversion classes which perform conversion from a bitmap, this value must always be zero. For those concrete conversion classes which perform conversion to a bitmap, this value must be less than the number of frames in the image. |
| IMPORT_C const TDesC & | FrameCommentL | ( | TInt | aFrameNumber | ) | [virtual] |
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.
| TInt aFrameNumber | The Frame Number within the image from which to retrieve the specified comment |
| void | RunL | ( | ) | [virtual] |
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 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)
RunL() runs under a trap harness in the active scheduler. If it leaves, then the active scheduler calls RunError() 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 RunL() or RunError() functions.
CActiveScheduler::Start CActiveScheduler::Error CActiveScheduler::WaitForAnyRequest TRAPD
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