Indicate if running in a separate thread

Default version of HandleCustomSyncL - always leaves with KErrNotSupported

Default version of InitCustomAsyncL - always leaves with KErrNotSupported

Default version of NotifyComplete - NO-OP

Plugin is interrogated with InitCustomAsyncL. If this works, then set internal Convert() cycle going

Passes on CustomSyncL to plugin

Implements cancellation of an outstanding request.

This function is called as part of the active object's 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.

DoCancel() must not wait for event completion; this is handled by Cancel().

CActive::Cancel

Return the number of frames in the image being decoded. This function can be called immediately after the call to create the decoder, thus enabling the caller to know how many frames need to be converted.

Return the status of the image. If the image is incomplete or not terminated correctly EFalse will be returned

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

Issues a read operation by sending the start position along with the destination descriptor and size.

When this function is used to read data from a file, it can send the start position and length in one IPC operation, and so avoid having to issue a seek first.

Because ContentAccess::CData does not support a synchronous version of this API, this function takes care of waiting for the operation to complete, and leaves with any error code. This simplifies the calling code.

CImageDecoder::SetImageTypeL

Indicate if a decode should abort early (ie. following a Cancel). Always false unless in a thread.

Size of data source in bytes. Only valid if data source is read-only.

Byte after last data block which was read from data source.

Start byte of last read from data file.

Flag to indicate if file input is read only or will grow

Flag to Check whether to Use Image buffer read optimization