Class CJPEGExifDecoderPlugin

class CJPEGExifDecoderPlugin : public CImageDecoderPlugin;

Description

The plugin API for Image Converter Library EXIF decoder plugins.

Derivation

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

• CImageDecoderPlugin - The PluginAPI for Image Converter Library decoder plugins.

• CJPEGExifDecoderPlugin - The plugin API for Image Converter Library EXIF decoder plugins.

Members

Defined in CJPEGExifDecoderPlugin:

• ExifMetadata()Returns the EXIF metadata associated with the image being decoded. This is a pur...

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 CImageDecoderPlugin:

• AmInThread()constIndicates if this decoder is running in a separate thread.
• AppendImageData(const TImageDataBlock *)Appends a new image data data block to the end of the internally held array.
• AppendImageDataBuffer(const HBufC8 *)Appends a new image data buffer to the end of the internally held array
• Cleanup()Called when the plugin is destroyed or a decode is cancelled. This may be overri...
• DataLength()constReturns the maximum number of bytes of data that can be decoded.
• Destination()constReturns the destination bitmap.
• DestinationMask()constReturns the destination bitmap mask.
• DoConvert()Performs a decode step. This effectively forms the RunL() call of the decoder.
• FrameBlockSize(TInt)constReturns the block size used in the specified frame. Always returns 4096 regardle...
• FrameCommentL(TInt,TInt)constReturns a particular comment attatched to a given frame of the image.
• FrameData(TInt)constReturns the frame data for a specified frame of the image.
• FrameHeaderBlockSize(TInt)constReturns the block size used in the specified frame's header. Always returns 4096...
• FrameInfo(TInt)constReturns the frame info for a specified frame of the image.
• FrameInfoStringsL(RFs &,TInt)Returns the codec specific frame information stored in resource files.
• HandleCustomSyncL(TInt)Called as a result of an associated CImageDecoder::CustomSyncL(TInt) function be...
• HandleProcessFrameResult(TInt,TFrameState)Deals with result from ProcessFrameL(). This function processes the results of t...
• ImageCommentL(TInt)constReturns a particular comment attatched to the image. Ownership of the returned b...
• ImageData(TInt)constReturns the image data block for the specified index.
• ImageDataCount()constReturns the number of image data blocks present in the image data.
• ImageInfo()constReturns image information such as colour depth, scaling support etc.
• ImageReadCodec()constReturns the plugin's read codec.
• ImageType(TInt,TUid &,TUid &)constReturns the image type and sub-type for a given frame of the image that has just...
• InitConvertL()Initialises data structures prior to decoding a frame.
• InitCustomAsyncL(TInt)Called as a result of the associated CImageDecoder::CustomAsync(TRequestStatus *...
• InsertImageData(const TImageDataBlock *,TInt)Inserts an image data block into the internally held array at the specified posi...
• IsImageHeaderProcessingComplete()constReturns the status of header processing. If the processing is incomplete or not ...
• NotifyComplete()Plugin defined actions resulting from a call by CImageDecoderPlugin::RequestComp...
• NumberOfFrameComments(TInt)constReturns the number of comments attatched to a given frame of the image.
• NumberOfFrames()constReturns the number of frames to be decoded.
• NumberOfImageComments()constReturns the number of comments attatched to the image.
• OpenExtraResourceFileLC(RFs &,const TUid,RResourceFile &)constLocates the extra resource file for the decoder aUid_extra.rsc, opens the resour...
• Position()constReturns the current position within the data.
• PrepareForProcessFrameL()Initialises system for ProcessFrameL(). This reads in a new buffer for ProcessFr...
• ReadDataL(TInt,TPtrC8 &,TInt)Reads a block of data into an internal buffer.
• ReadFrameHeadersL()Invokes the ReadFrameHeadersL method of the supplied plugin which should process...
• RemoveImageData(TInt)Removes a specified image data block from the internally held array.
• RequestComplete(TInt)Must be called on completion of decoding the image data.
• RequestInitL(TInt)Forces initialization of data structures prior to decoding a frame.
• ScanDataL()Invokes the CImageDecoderPlugin::ReadFrameHeadersL() method of the supplied plug...
• SelfComplete(TInt)Must be called at the end of a slice of decoding.
• SetDataLength(TInt)Sets the maximum number of bytes of data that can be decoded.
• SetImageInfo(const TFrameInfo &)Sets the image information.
• SetImageReadCodec(CImageReadCodec *)Sets the plugin's read codec. Ownership of the codec is transferred to the plugi...
• SetPosition(const TInt)Sets the current position in the data.
• SetSelfPending()May be called at the start of a slice of decoding if the decoding is expected to...
• SetStartPosition(TInt)Sets the starting position of the frame to be decoded.
• SetThumbnailData(HBufC8 *)Passes a pointer to a descriptor containing the thumbnail from the plugin to the...
• ShouldAbort()constIndicates if the decoder should abort early ie. following a call to Cancel().
• SourceData()Value to be fed to CImageReadCodec::ProcessFrameL(TBufPtr8 &).
• SourceLength()constReturns the length of the source data in bytes.
• StartPosition()constReturns the starting position of the frame to be decoded.
• ValidDestination()constReturns the validity of the destination bitmap.
• ValidDestinationMask()constIndicates if the destination bitmap mask is valid.

IMPORT_C virtual MExifMetadata* ExifMetadata()=0;

Description

Returns the EXIF metadata associated with the image being decoded. This is a pure virtual function that each individual plugin must implement.

Return value

MExifMetadata * A pointer to the metadata. NULL if there is no metadata available.