CAN CSA-ISO IEC 14496-22A-2012 Information technology - Coding of audio-visual objects - Part 22 Open Font Format - AMENDMENT 1 Support for many-to-one range mappings.pdf

1、Information technology Coding of audio-visual objects Part22:Open Font Format AMENDMENT1:Supportformany-to-onerangemappingsAmendment 1:2012 (IDT) toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-22-10(ISO/IEC 14496-22:2009, IDT)NOT FOR RESALE.PUBLICATION NON DESTINE LA REVENTE.CSA Standards Update

2、 ServiceAmendment 1:2012 toCAN/CSA-ISO/IEC 14496-22-10March 2012Title:Information technology Coding of audio-visual ob jects Part22:Open Font Format AMENDMENT1:Support formany-to-onerangemappingsPagination:5 pages (iii preliminary and 2 text)To register for e-mail notification about any updates to t

3、his publication go on-line to shop.csa.caclick on E-mail Services under MY ACCOUNTclick on CSA Standards Update ServiceThe List ID that you will need to register for updates to this publication is 2420902.If you require assistance, please e-mail techsupportcsa.ca or call 416-747-2233.Visit CSAs poli

4、cy on privacy at csagroup.org/legal to find out how we protect your personal information.Reference numberISO/IEC 14496-22:2009/Amd.1:2010(E)ISO/IEC 2010INTERNATIONAL STANDARD ISO/IEC14496-22Second edition2009-08-15AMENDMENT 12010-12-01Information technology Coding of audio-visual objects Part 22: Op

5、en Font Format AMENDMENT 1: Support for many-to-one range mappings Technologies de linformation Codage des objets audiovisuels Partie 22: Format de police de caractres ouvert AMENDEMENT 1: Support pour mappages dintervalle origines multiples et destination unique ISO/IEC 14496-22:2009/Amd.1:2010(E)

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10、ow or ISOs 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 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2010 All rights reservedAmendment 1:2012 to CAN/CSA-ISO/IEC 14496-22-10ISO/IEC 14496-22:2009/

11、Amd.1:2010(E) ISO/IEC 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each

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14、 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of

15、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Amendment 1 to ISO/IEC 14496-22:2009 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.

16、Amendment 1:2012 to CAN/CSA-ISO/IEC 14496-22-10ISO/IEC 14496-22:2009/Amd.1:2010(E) ISO/IEC 2010 All rights reserved 1Information technology Coding of audio-visual objects Part 22: Open Font Format AMENDMENT 1: Support for many-to-one range mappings In 5.2.1.3.8, change the header title from “Format

17、13: Last resort font” to “Format 13: Many-to-one range mappings” In 5.2.1.3.8, replace the first paragraph with the following: This subtable deals with situations where the same glyph is used for hundreds or even thousands of consecutive characters spanning across multiple ranges of the code space.

18、This subtable format may be useful for “Last Resort” fonts, although these fonts may use other suitable subtable formats as well (see also subclause 5.2.2, Font header table, flags: bit 14). In 5.2.1.3.8, add the following informative note in the end of the Subclause: NOTE The subtable formats 12 an

19、d 13 have the same data structure; they differ only in the interpretation of the startGlyphID/glyphID fields. In 5.2.2, “head Font header table”, replace “Bit 14: Reserved, set to 0” with: Bit 14: Last Resort font. If set, indicates that the glyphs encoded in the cmap subtables are simply generic sy

20、mbolic representations of code point ranges and dont truly represent support for those code points. If unset, indicates that the glyphs encoded in the cmap subtables represent proper support for those code points. In 5.2.6.2, “Platform IDs, Platform-specific encoding IDs and Language IDs”, replace t

21、he table “Unicode platform-specific encoding IDs (platform ID = 0)” with the following: Encoding ID Description 0 Unicode 1.0 semantics 1 Unicode 1.1 semantics 2 ISO/IEC 10646 semantics Amendment 1:2012 to CAN/CSA-ISO/IEC 14496-22-10ISO/IEC 14496-22:2009/Amd.1:2010(E) 2 ISO/IEC 2010 All rights reser

22、ved3 Unicode 2.0 and onwards semantics, Unicode BMP only (cmap subtable formats 0, 4, 6). 4 Unicode 2.0 and onwards semantics, Unicode full repertoire (cmap subtable formats 0, 4, 6, 10, 12). 5 Unicode Variation Sequences (cmap subtable format 14). 6 Unicode full repertoire (cmap subtable formats 0,

23、 4, 6, 10, 12, 13). In 5.2.6.2, “Platform IDs, Platform-specific encoding IDs and Language IDs”, after the paragraph that immediately follows the table “Unicode platform-specific encoding IDs (platform ID = 0)”, insert the following paragraph: A new encoding ID for the Unicode platform is also somet

24、imes assigned when new cmap subtable formats are added to the specification, so as to allow for compatibility with existing parsers. For example, when cmap subtable formats 10 and 12 were added to the specification, encoding ID 4 was added as well, and when cmap subtable format 13 was added to the s

25、pecification, encoding ID 6 was added. The cmap subtable formats listed in the table above are the only ones that may be used for the corresponding encoding ID. Amendment 1:2012 to CAN/CSA-ISO/IEC 14496-22-10ISO/IEC 14496-22:2009/Amd.1:2010(E) ICS 35.040 ISO/IEC 2010 All rights reserved Copyright No

26、ticeThis Amendment to the International Standard contains information copyright protected by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). Except as permitted under the laws of Canada, no extract of this Amendment to the Internation

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