JPEG Image Frame Plug-in Library Overview

Purpose

JPEG Image Frame Plug-in is the Imaging Frameworks EXIF decoder / encoder Plug-in which provides to decode / encode a JPEG file or descriptor to a binary image data in an uniform way.

JPEG Image Frame Plug-in Library Details

You must obtain necessary binaries in the form of DLL file to implement the JPEG Image Frame Plug-in function.

Architectural Relationship

JPEG Image Frame Plug-in is plug-in for the Imaging Frameworks decoder / encoder plug-in relating to a binary image data.

Description

Inorder to implement the JPEGExifPlugin.dll four new classes are added they are explained in detail in Key Classes section. These classes are derived from:

• CJPEGImageFrameDecoder and CJPEGImageFrameEncoder are derived from EXIF, they are CJPEGExifDecoder and CJPEGExifEncoder.

• CJPEGImageFrameDecoderPlugin and CJPEGImageFrameEncoderPlugin are derived from EXIF plugin, they are CJPEGExifDecoderPlugin and CJPEGExifEncoderPlugin.

Key JPEG Image Frame Plug-in Classes

The key classes are:

• CJPEGImageFrameDecoder Use an extension of the EXIF JPEG encoder to encode JPEG image from CImageFrame source type to either a file or a descriptor.

• CJPEGImageFrameDecoderPlugin This class is an extension of the Imaging Frameworks EXIF decoder plug-in which provides to decode a JPEG file or descriptor to CImageFrame.

• CJPEGImageFrameEncoder Use an extension of the EXIF JPEG decoder to decode JPEG image from CImageFrame source type to either a file or a descriptor.

• CJPEGImageFrameEncoderPlugin This class is an extension of the Imaging Frameworks EXIF encoder plug-in which provides to encode a JPEG file or descriptor to CImageFrame.

Using JPEG Image Frame Plug-in

The JPEG Image Frame Plug-in functionality is used for the following:

• To Decode image data to a bitmap (RGB data wrapped by a CFbsBitmap) from a file or a descriptor containing JPEG data.

• To Encode an uncompressed bitmap (CFbsBitmap) to JPEG data format within a file or a descriptor.

• It allow access to the EXIF metadata.