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 responsible 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()Default constructor
• ConstructL()Second stage constructor. This should be called during construction of the deriv...
• ImplementationUid()constReturns the decoder implementation UID.
• NewDecoderL()constDefault version creates a basic CImageDecoder
• NewPluginL()constCreates a new concrete CImageDecoderPlugin object.
• RequestThread()constRequests a threaded decode.
• ~CImageDecodeConstruct()Destructor

Inherited from CBase:

• Delete(CBase *)Deletes the specified object.
• Extension_(TUint,TAny *&,TAny *)Extension function
• 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...

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 decoder implementation UID.

Return value

TUid The implementation UID.

IMPORT_C virtual 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.

IMPORT_C virtual 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.