Class CImageDecodeConstruct

class CImageDecodeConstruct : public CBase;

Description

Provides functions related to constructing decoders.

Objects of this class are loaded by ECOM, and it is this class which is responsible for instantiating the decoder plugins. Plugin writers must derive their own plugin specific variants. The derived class is resposible for defining its own factory function to create instances of itself.

Derivation

• CBase - Base class for all classes to be instantiated on the heap

• CImageDecodeConstruct - Provides functions related to constructing decoders

Members

Defined in CImageDecodeConstruct:
CImageDecodeConstruct(), ConstructL(), ImplementationUid(), NewDecoderL(), NewPluginL(), RequestThread(), ~CImageDecodeConstruct()

Inherited from CBase:
Delete(), Extension_(), operator new()

IMPORT_C ~CImageDecodeConstruct();

Description

Destructor

protected: IMPORT_C CImageDecodeConstruct();

Description

Default constructor

protected: IMPORT_C void ConstructL();

Description

Second stage constructor. This should be called during construction of the derived class.

IMPORT_C TUid ImplementationUid() const;

Description

Returns the encoder implementation UID.

Return value

TUid The implementation UID.

virtual IMPORT_C CImageDecoder *NewDecoderL() const;

Description

Default version creates a basic CImageDecoder

Return value

CImageDecoder * A pointer to a fully constructed CImageDecoder

virtual CImageDecoderPlugin *NewPluginL() const=0;

Description

Creates a new concrete CImageDecoderPlugin object.

This is a pure virtual function that each derived class must implement.

Return value

CImageDecoderPlugin * A pointer to a fully constructed CImageDecoderPlugin.

virtual IMPORT_C TBool RequestThread() const;

Description

Requests a threaded decode.

The default version of the virtual function returns EFalse, that is, it does not request a threaded decode.

Return value

TBool ETrue a threaded decode is requested, otherwise, EFalse.