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ISO_IEC_8632-3(CGM二进制格式说明).pdf
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150/EIC国际标准规定了一套标准的,与设备无关的定义图形的语法和词法元素。它分为4个部分。第一部分是功能描述,包括元素标识符、语义说明以及参数描述;其余三部分为CGM标准的三种编码形式,即字符编码、二进制数 编码和明文编码。但是,CGM标准本身并不提供生成和解释元文件的具体方法,而是利用上述三种不同的标准数据编码形式来实现元文件的元素功能。
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Reference number
ISO/IEC 8632-3:1999(E)
©
ISO/IEC 1999
INTERNATIONAL
STANDARD
ISO/IEC
8632-3
Second edition
1999-12-15
Information technology — Computer
graphics — Metafile for the storage and
transfer of picture description
information —
Part 3:
Binary encoding
Technologies de l'information — Infographie — Métafichier de stockage
et de transfert des informations de description d'images —
Partie 3: Codage binaire
ISO/IEC 8632-3:1999(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO/IEC 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 · CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO/IEC 1999 – All rights reserved
ISO/IEC 8632-3:1999(E)
© ISO/IEC 1999 – All rights reserved
iii
Contents Page
1 Scope......................................................................................................................................................1
2 Conformance.........................................................................................................................................1
3 Normative references ...........................................................................................................................2
4 Notational conventions ........................................................................................................................2
5 Overall structure ...................................................................................................................................2
5.1 General form of metafile.......................................................................................................................2
5.2 General form of pictures ......................................................................................................................2
5.3 General structure of the binary metafile.............................................................................................3
5.4 Structure of the command header ......................................................................................................4
6 Primitive data forms..............................................................................................................................6
6.1 Signed integer .......................................................................................................................................6
6.1.1 Signed integer at 8-bit precision .........................................................................................................6
6.1.2 Signed integer at 16-bit precision .......................................................................................................6
6.1.3 Signed integer at 24-bit precision .......................................................................................................7
6.1.4 Signed integer at 32-bit precision .......................................................................................................7
6.2 Unsigned integer...................................................................................................................................7
6.2.1 Unsigned integers at 8-bit precision...................................................................................................7
6.2.2 Unsigned integers at 16-bit precision.................................................................................................7
6.2.3 Unsigned integers at 24-bit precision.................................................................................................7
6.2.4 Unsigned integers at 32-bit precision.................................................................................................8
6.3 Character................................................................................................................................................8
6.4 Fixed point real......................................................................................................................................8
6.4.1 Fixed point real at 32-bit precision......................................................................................................8
6.4.2 Fixed point real at 64-bit precision......................................................................................................8
6.4.3 Value of fixed point reals......................................................................................................................8
6.5 Floating point ........................................................................................................................................9
6.5.1 Floating point real at 32-bit precision.................................................................................................9
ISO/IEC 8632-3:1999(E)
iv © ISO/IEC 1999 – All rights reserved
6.5.2 Floating point real at 64-bit precision ...............................................................................................10
7 Representation of abstract parameter types....................................................................................10
8 Representation of each element........................................................................................................15
8.1 Method of presentation ......................................................................................................................15
8.2 Delimiter elements ..............................................................................................................................16
8.3 Metafile descriptor elements..............................................................................................................18
8.4 Picture descriptor elements...............................................................................................................25
8.5 Control elements.................................................................................................................................30
8.6 Graphical primitive elements.............................................................................................................33
8.7 Attribute elements...............................................................................................................................41
8.8 Escape element ...................................................................................................................................50
8.9 External elements................................................................................................................................51
8.10 Segment control and segment attribute elements ..........................................................................52
8.11 Application structure descriptor elements.......................................................................................56
9 Defaults ................................................................................................................................................57
10 Profile encoding rules, proforma, and Model Profile ......................................................................57
10.1 Encodings............................................................................................................................................57
10.2 Metafile defaults ..................................................................................................................................57
10.3 Floating point values ..........................................................................................................................57
10.4 Profile proforma tables (PPF) ............................................................................................................57
10.5 Permissible alternative coding representation ................................................................................58
Annex A (normative) Formal grammar....................................................................................................................59
Annex B (informative) Examples..............................................................................................................................61
Annex C (informative) List of binary encoding metafile element codes..............................................................64
ISO/IEC 8632-3:1999(E)
© ISO/IEC 1999 – All rights reserved
v
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in
liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO/IEC 8632 may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 8632-3 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information
technology
, Subcommittee SC 24,
Computer graphics and image processing
.
This second edition cancels and replaces the first edition (ISO/IEC 8632-3:1992), which has been technically
revised. It also incorporates Amendment 1:1994 and Amendment 2:1995. Note that the previous edition of
ISO/IEC 8632-3, published in 1992, was a first edition but second edition was indicated by error on its cover page
and in the foreword.
ISO/IEC 8632 consists of the following parts, under the general title
Information technology — Computer graphics
— Metafile for the storage and transfer of picture description information
:
— Part 1: Functional specification
— Part 3: Binary encoding
— Part 4: Clear text encoding
Annex A forms a normative part of this part of ISO/IEC 8632. Annexes B and C are for information only.
NOTE In previous editions of ISO/IEC 8632, Part 2 defined a Character Encoding. Part 2 was withdrawn in 1998, due to its lack
of implementation and use.
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