Imaging Frameworks Overview

Purpose

This is a lightweight component which supports the image conversion function (that enables you to encode and decode an image), the image transformation function and the image display function.

Required background

Imaging Frameworks provides access to the Imaging Plug-ins component to facilitate some of the more common image formats.

Note: The image formats listed below, are supported only for CImageDecoder and CImageEncoder :

Architectural relationships

Imaging Frameworks is a standalone image component in the Multimedia APIs and Frameworks collection.

Imaging Frameworks component summary

This component includes the following functionality:

• Image Conversion Provides facilities to convert single and multiframe images, stored in files or descriptors to CFbsBitmap objects. The library also provides facilities to convert single frame images from CFbsBitmap objects to files and descriptors. For more information about Image Conversion functionality, see Image Conversion Overview.

• Image Transform CImageTransform provides an interface for scaling the images which is still pictures encoded in the standard formats such as JPEG, GIF and PNG. This function works on the images stored in the files or the descriptors. For more information about Image Transform functionality, see Image Transform Overview.

• Image Display CImageDisplay provides a convenient interface to convert the encoded images into CFbsBitmap object that are ready to be displayed on the screen. For more information about Image Display functionality, see Image Display overview.

• Image Processor ImageProcessor::CImgProcessor class is used to process an image and the TEffect classes in ImageProcessor apply various effects like overlay or antique to an image. For more information about Image Processor functionality, see Image Processor overview.

• Bitmap Transform Provides the rotation functionality, the mirroring functionality and the scaling transformations for CBitmapScaler bitmaps as asynchronous operations. For more information about Bitmap Transform functionality, see Bitmap Transform overview.

• Exif Client This is provided in all main functions like CImageDecoder, CImageEncoder, CImageTransform and CImageDisplay through an abstract interface. This function can be implemented and managed through an Imaging plug-in for exposing functionality to the client through the plug-in extension mechanism. For more information about Exif Client functionality, see Exif Client overview.

• GIF Scaler Client Provides the scaling and the colour quantization of bitmaps as an asynchronous operations. This is primarily used to provide bitmaps suitable for the gif encoding. And transparency information can be supplied in the form of a mask bitmap. For more information about GIF Scaler Client functionality, see GIF Scaler Client overview.

• JPEG Image Frame Plug-in Decodes an image data to CFbsBitmap object from a file or a descriptor containing JPEG data, encodes an uncompressed CFbsBitmap object to JPEG data format within a file or descriptor and allows access to EXIF metadata. For more information about JPEG Image Frame Plug-in functionality, see JPEG Image Frame Plug-in overview.

• Media Client Image Provides interface to set image conversion utility functions. For more information about Media Client Image functionality, see Media Client Image overview.

• JPEG Exif Plug-in Provides a standard for storing JPEG compressed metadata tag in the digital image file. For more information about JPEG Exif Plug-in functionality, see JPEG Exif Plug-in overview.

Typical uses

The Imaging Frameworks component is used for the following tasks:

• Decoding an image

• Encoding an image

• Transforming an image

• Displaying an image

• Image conversion