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ISO/IEC 8632-1:1999(EN) Information technology — Computer graphics — Metafile for the storage and transfer of picture description information — Part 1: Functional specification
ISO/IEC 8632-1:1999 provides a file format suitable for the storage and retrieval of picture description information. The files and formats consist of an ordered set of elements that may be used to describe pictures in a way that is compatible between systems of different architectures, compatible with devices of differing capabilities and design, and meaningful to application constituencies.
The elements specified in ISO/IEC 8632-1:1999 provide for the representation of a wide range of pictures on a wide range of graphical devices. The elements are organized into groups that delimit major structures, that specify the representations used within the metafile, that control the display of the picture, that perform basic drawing action, that control the attributes of the basic drawing actions, that allow application-specific structuring to be overlaid on the graphical content, and that provide access to non-standard equipment capabilities.
The metafile is explained in a way that, in addition to sequential access to the whole metafile, random access to individual pictures and individual context-independent application structures are well-defined. Applications which require random accesses to pictures or context-independent application structures within pictures may, within the metafile, define directories to these pictures or context-independent application structures. The metafile may be then opened and randomly accessed without interpreting the entire metafile.
In addition to a functional specification, two standard encodings of the metafile syntax are specified in ISO/IEC 8632-1:1999. These encodings address the requirements of applications that require small metafile size plus minimum effort to generate and interpret, and maximum flexibility for a human reader or editor of the metafile.
ISO/IEC 8632-1:1999 describes the format using an abstract syntax. The remaining parts of ISO 8632 specify standardized encodings that conform to this syntax: ISO/IEC 8632-3 specifies a binary encoding; ISO/IEC 8632-4 specifies a clear text encoding.
ISO/IEC 8632-3:1999(EN) Information technology — Computer graphics — Metafile for the storage and transfer of picture description information — Part 3: Binary encoding
ISO/IEC 8632-3:1999 specifies a binary encoding of the Computer Graphics Metafile. For each of the elements explained in ISO/IEC 8632-1, this part specifies an encoding in terms of data types.
For each of the given data types, an explicit representation in terms of bits, octets and words is specified. For few data types, the exact representation is a function of the precisions being used in the metafile, as recorded in the Metafile Descriptor.
This(ISO/IEC 8632-3:1999) encoding of the Computer Graphics Metafile will, in many circumstances, minimize the effort required to generate and interpret the metafile.
ISO/IEC 8632-4:1999(EN) Information technology — Computer graphics — Metafile for the storage and transfer of picture description information — Part 4: Clear text encoding
ISO/IEC 8632-4:1999 specifies a clear text encoding of the Computer Graphics Metafile. For every element specified in ISO/IEC 8632-1, a clear text encoding is specified. Permitted abbreviations are specified. The overall format of the metafile and the means by which comments may be interspersed in the metafile is explained.
This encoding of the CGM lets metafiles to be created and maintained in a form which is simple to type, easy to edit and convenient to read.
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