Class CJPEGExifDecoder

class CJPEGExifDecoder : public CImageDecoder;

Description

Provides access to the exif jpeg decoder.

This class provides functions to decode jpeg images held in files or descriptors.

Derivation

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

• CImageDecoder - Provides access to the Image Conversion Library decoders.

• CJPEGExifDecoder - Provides access to the exif jpeg decoder.

Members

Defined in CJPEGExifDecoder:

• ConstructL()Initialises an exif decoder.
• ExifMetadata()gets the metadata associated to this instance of the decoder
• NewL()Constructs a new exif decoder.

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...

Inherited from CImageDecoder:

• Cancel()Cancels any conversions currently in progress (Cancel is synchronous).
• ContinueConvert(TRequestStatus *)Continue decoding a frame and/or mask after new image data was added to the sour...
• ContinueProcessingHeaderL()Continue processing image headers after new image data was added to the source f...
• Convert(TRequestStatus *,CFbsBitmap &,CFbsBitmap &,TInt)Start decoding an image frame and mask asynchronously.
• Convert(TRequestStatus *,CFbsBitmap &,TInt)Start decoding an image frame asynchronously.
• CustomAsync(TRequestStatus *,TInt)Sets up background convert cycle, bypassing CImageDecoder::Convert(TRequestStatu...
• CustomSyncL(TInt)Calls CImageDecoderPlugin::HandleCustomSyncL(aParam) that executes user defined ...
• DataNewL(RFs &,const TDesC8 &,const TDesC8 &,const TOptions)Create a decoder for the image in the source buffer. The client supplies a MIME ...
• DataNewL(RFs &,const TDesC8 &,const TOptions,const TUid,const TUid,const TUid)Creates a decoder for the image in the source buffer.
• EAllowGeneratedMaskSetting this flag requests that the plugin generate a mask during decoding.
• EImageTypeMainUse the main image
• EImageTypeThumbnailUse the thumbnail as source image
• EOptionAllowZeroFrameOpenAllow Opens to complete with no error if there is less than one frame available....
• EOptionAlwaysThreadPerform the decoding in a separate thread
• EOptionExtReserved7Reserved.
• EOptionExtReserved8Reserved.
• EOptionIgnoreExifMetaDataWhen specified, this flag indicates that the decoder must ignore the EXIF meta-d...
• EOptionNoDitherDo not dither the decoded image
• EOptionNoneNo flag set
• EPreferFastDecodeUse the highest possible image decoding speed; this may result in lower image qu...
• FileNewL(RFs &,const TDesC &,const TDesC8 &,const TOptions)Create a decoder for the image in the named file. The client supplies a MIME typ...
• FileNewL(RFs &,const TDesC &,const TOptions,const TUid,const TUid,const TUid)Create a decoder for the image in the named file.
• FileNewL(RFs &,const TMMSource &,const TDesC8 &,const TOptions)Create a decoder for the image in the named file. The client supplies a MIME typ...
• FileNewL(RFs &,const TMMSource &,const TOptions,const TUid,const TUid,const TUid)Create a decoder for the image in the named source.
• FrameCommentL(TInt,TInt)constReturn a particular comment attached to a given frame of the image.
• FrameCount()constReturn the number of frames in the image being decoded.
• FrameData(TInt)constReturns additional plugin specific information on a specified frame.
• FrameInfo(TInt)constReturn the frame info for a specified frame of the image.
• FrameInfoStringsL(TInt)Return the formatted frame information strings for a specific frame. Ownership i...
• FrameInfoStringsLC(TInt)Return the formatted frame information strings for a specific frame and leave it...
• GetFileTypesL(RFileExtensionMIMETypeArray &)Get a list of the file extensions that can be decoded and their corresponding MI...
• GetImageSubTypesL(const TUid,RImageTypeDescriptionArray &)For a given basic image type, get a list of the sub image types that can be deco...
• GetImageTypesL(RImageTypeDescriptionArray &)Get a list of the basic image types that can be decoded, based on the currently ...
• GetImplementationInformationL(TUid)Gets the implementation information for a specific decoder plugin
• GetMimeTypeDataL(const TDesC8 &,TDes8 &)Get the primary MIME type of the decoder that will be used to decode a descripto...
• GetMimeTypeFileL(RFs &,const TDesC &,TDes8 &)Get the primary MIME type of the decoder that will be used to decode a file. Som...
• ImageCommentL(TInt)constReturn a particular comment attached to the image.
• ImageType(TInt,TUid &,TUid &)constRetrieves the image type and sub-type for a given frame of the image that has ju...
• ImplementationUid()constReturn the implementation UID of the decoder being used to decode the image.
• IsImageHeaderProcessingComplete()constReturn the status of the image.
• NumberOfFrameComments(TInt)constReturn the number of comments attached to a given frame of the image (as opposed...
• NumberOfImageComments()constReturn the number of comments attached to the image (as opposed to a particular ...
• Plugin()constReturns associated CImageDecoderPlugin.
• ReducedSize(const TSize &,TInt,TSize &)constCalculates reduced size of the decoded bitmap based on the input parameters and ...
• ReductionFactor(const TSize &,const TSize &)constFunction to calculate the reduction factor based on the input parameters.
• SetDecoderThreadPriority(TThreadPriority)Set the decoder worker thread priority
• SetImageTypeL(TInt)Set the source image type, this can be any value from TImageType. It can leave w...
• TImageTypeFlags to control which image is decoded. This can be used when the source file o...
• TOptionsFlags to control how the image is decoded. These can be combined using an OR ope...

IMPORT_C static CJPEGExifDecoder* NewL();

Description

Constructs a new exif decoder.

A leave occurs if there is insufficient memory available.

Return value

CJPEGExifDecoder * A pointer to the new exif jpeg decoder.

protected: IMPORT_C void ConstructL();

Description

Initialises an exif decoder.

A leave occurs if the associated ICL plugin could not be instanciated

IMPORT_C MExifMetadata* ExifMetadata();

Description

gets the metadata associated to this instance of the decoder

NULL is returned if no metadata was found

Return value

MExifMetadata * A pointer to the metadata