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version 1.48, 2015/03/30 21:46:47
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version 1.49, 2015/04/02 19:17:44
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| width="72" height="48"> </a> </p>
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width="72" height="48"> </a> </p>
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| <h1 style="clear:both" id="title">WOFF File Format 2.0 </h1>
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<h1 style="clear:both" id="title">WOFF File Format 2.0 </h1>
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| <h2 id="W3C-doctype">W3C Editors Draft 26 March 2015 </h2>
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<h2 id="W3C-doctype">W3C Editors Draft 2 April 2015 </h2>
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| <dl>
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<dl>
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| <dt>This version:</dt>
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<dt>This version:</dt>
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| <!--<dd> <a href="http://www.w3.org/TR/2014/WD-woff20-20140321/">
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<!--<dd> <a href="http://www.w3.org/TR/2014/WD-woff20-20140321/">
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| <p>Editor's note: Do we need to add the conformance requirement for UA regarding table transforms?</p>
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<p>Editor's note: Do we need to add the conformance requirement for UA regarding table transforms?</p>
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| </div>
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</div>
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| <p>The WOFF 2.0 transformations applied to certain tables are desinged to reduce and/or
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<p>The WOFF 2.0 transformations applied to certain tables are designed to reduce and/or
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| eliminate the built-in redundancies of the SFNT format and restructure the font data
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eliminate the built-in redundancies of the SFNT format and restructure the font data
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| stream for more efficient entropy encoding. As a result, the reconstructed font data
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stream for more efficient entropy encoding. As a result, the reconstructed font data
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| will retain the exact functionality of the input font file, but due to certain possible
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will retain the exact functionality of the input font file, but due to certain possible
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| encoding variations (such as e.g. various levels of optimization of outline point
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encoding variations (such as e.g. various levels of optimization of outline point
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| coordinates in the 'glyf' table, or difference in offset calculations of the 'loca' table)
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coordinates in the 'glyf' table, and/or difference in offset calculations of the 'loca'
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| different WOFF2 decoders may produce an output file that will not be a bitwise match to the
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table) different WOFF2 decoders may produce an output file that will not be a bitwise
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| input font file. These differences will invalidate the 'DSIG' table, if one is present and,
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match to the input font file. The font tables of the input font file may also be subjected
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| therefore, the compliant WOFF2 encoder <span class="conform at" id="conform-mustRemoveDSIG">
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to reordering operations, which may take place either as a part of the encoding process
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| MUST remove the DSIG table from an input font data</span>, prior to applying transformations
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or the tables can be reordered by a decoder to comply with the recommended table order
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| and entropy coding steps.</p>
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defined by the [<cite><a href="#ref-OFF">OFF</a></cite>] specification – as a result,
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even if the content of the font data tables is not affected, the table offsets may change.
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These differences between encoded and decoded font data structures will invalidate
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the 'DSIG' table, if one is present; therefore, the compliant WOFF2 encoder
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<span class="conform at" id="conform-mustRemoveDSIG">MUST remove the DSIG table from an input
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font data</span>, prior to applying transformations and entropy coding steps.</p>
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| <p>The WOFF 2.0 encoders <span class="conform at" id="conform-mustSetBit11">MUST also set
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<p>The WOFF 2.0 encoders <span class="conform at" id="conform-mustSetBit11">MUST also set
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| bit 11 of the 'flags' field of the <span class=tt>head</span> table</span>
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bit 11 of the 'flags' field of the <span class=tt>head</span> table</span>
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| <li>Added new appendix A with the draft text of top-level media type registration for a new 'font' type.</li>
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<li>Added new appendix A with the draft text of top-level media type registration for a new 'font' type.</li>
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| <li>Added this "Changes" appendix.</li>
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<li>Added this "Changes" appendix.</li>
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| </ul>
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</ul>
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| <p>A <a href="http://dev.w3.org/cvsweb/webfonts/WOFF2/spec/Overview.html.diff?r1=1.14;r2=1.48;f=h">color-coded diff</a>
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<p>A <a href="http://dev.w3.org/cvsweb/webfonts/WOFF2/spec/Overview.html.diff?r1=1.14;r2=1.49;f=h">color-coded diff</a>
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| between the editros draft used to prepare the First Public Working Draft and the editors draft used to prepare
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between the editros draft used to prepare the First Public Working Draft and the editors draft used to prepare
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| the Last Call Working Draft (this document) is available.</p>
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the Last Call Working Draft (this document) is available.</p>
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| <br/>
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<br/>
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