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Issue 0230 vertical scripts #327

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merged 5 commits into from
May 26, 2017
Merged

Issue 0230 vertical scripts #327

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d5e89f9
Remove use of 'vertical scripts' and 'horizontal scripts', changing t…
skynavga May 23, 2017
2d08c8a
Regenerate ED.
skynavga May 23, 2017
0429c76
Address reviewer comment (#230).
skynavga May 25, 2017
65928cb
Regenerate ED.
skynavga May 25, 2017
d2966e2
Revert changes to ED.
skynavga May 26, 2017
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62 changes: 41 additions & 21 deletions spec/ttml2.xml
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Expand Up @@ -13098,8 +13098,7 @@ that defined by <bibref ref="css3-decoration"/>, &sect; 3.</p>
<p>The <att>tts:textOrientation</att> attribute is used to specify a style property that
defines a text orientation to apply to glyphs that are selected for <loc href="#terms-glyph-area">glyph areas</loc> generated
by content flowed into a region to which a vertical writing mode applies.</p>
<p>This attribute may be specified by any
element type
<p>This attribute may be specified by any element type
that permits use of attributes in the TT Style Namespace; however, this attribute applies
as a style property only to those element types indicated in the following table.</p>
<table id="style-property-details-textOrientation" role="common">
Expand Down Expand Up @@ -13143,27 +13142,38 @@ as a style property only to those element types indicated in the following table
<p>For the purpose of determining applicability of this style property,
each character child of a <el>p</el> element is considered to be enclosed in an anonymous
span.</p>
<p>If the value of this attribute is <code>mixed</code>, then, in vertical writing modes,
glyphs from horizontal scripts are set sideways, i.e., 90&deg; clockwise from
their nominal orientation in horizontal text, while glyphs from vertical scripts are not
affected.</p>
<p>If the value of this attribute is <code>sidewaysLeft</code>, then, in vertical writing modes,
glyphs from horizontal scripts are set sideways with 90&deg; counter-clockwise rotation.</p>
<p>If the value of this attribute is <code>sidewaysRight</code>, then, in vertical writing modes,
glyphs from horizontal scripts are set sideways with 90&deg; clockwise rotation.</p>
<p>If the value of this attribute is <code>sideways</code>, then, in vertical writing modes,
glyphs from horizontal scripts are set sideways, either 90&deg; clockwise or
90&deg; counter-clockwise, according to whether the writing mode is
<code>tbrl</code> or <code>tblr</code>, respectively. Glyphs from vertical scripts are not
affected.</p>
<p>If the value of this attribute is <code>upright</code>, then, in vertical writing modes,
glyphs from horizontal scripts are set upright, i.e., using their
nominal orientation in horizontal text, while glyphs from vertical scripts are not
affected. In addition, for purposes of bidirectional processing, this value causes all

<p>The presentation semantics of this style property apply only when a vertical
writing mode applies; therefore, if a horizontal writing mode applies, this style
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It doesn't look like vertical writing mode and horizontal writing modes are defined either in TTML or in XSL 1.1. Suggest adding text to tts:writingMode to list which modes are considered horizontal and which vertical.

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Addressed in 0429c76.

property has no effect.</p>

<p>In the following, glyphs associated with content characters are described in terms of whether
they are rotated or not rotated in vertical writing modes, where this determination is made in accordance with
the <code>Vertical_Orientation</code> of each content character as determined by <bibref ref="utr50"/>.</p>
<p>If the value of this attribute is <code>mixed</code>, then rotated glyphs are set sideways
and non-rotated glyphs are set upright, where <emph>sideways</emph> means rotated either 90&deg; clockwise or 90&deg; count-clockwise,
respectively, in accordance with whether the applicable block progression direction is right-to-left or left-to-right, and where <emph>upright</emph>
means not rotated.</p>
<note role="clarification">
<p>According to <bibref ref="utr50"/>, visual rotation of a glyph may occur through either the substitution of
a rotated glyph or by performing an affine rotation transformation on the glyph's outline (or raster image),
where the determination of which of these applies depends on the specific font used during presentation processing.</p>
</note>
<p>If the value of this attribute is <code>sidewaysLeft</code>, then rotated glyphs
are rotated 90&deg; counter-clockwise.</p>
<p>If the value of this attribute is <code>sidewaysRight</code>, then rotated glyphs
are rotated 90&deg; clockwise.</p>
<p>If the value of this attribute is <code>sideways</code>, then rotated glyphs
are rotated either 90&deg; clockwise or 90&deg; count-clockwise, respectively,
in accordance with whether the applicable block progression direction is right-to-left or left-to-right.</p>
<p>If the value of this attribute is <code>upright</code>, then all characters are considered
to have a vertical orientation of <code>U</code>, in which case no glyphs are rotated. In this case the
(potential) substitution of rotated glyphs and the application of an affine rotation transformation
are disabled, and the glyph rendered is the non-rotated form.
In addition, for purposes of bidirectional processing, this value causes all
affected characters to be treated as strong left-to-right, i.e., to be treated as if
a <att>tts:direction</att> of <code>ltr</code> and <att>tts:unicodeOverride</att> of
<code>override</code> were applied.</p>
<p>If a vertical writing mode does not apply, then this style property has no effect.</p>
<p>If a computed value of the property associated with this attribute is not supported,
then a <loc href="#terms-presentation-processor">presentation processor</loc> must use the value <code>mixed</code>.</p>
<p>The <att>tts:textOrientation</att> style is illustrated by the following
Expand All @@ -13175,7 +13185,7 @@ example.</p>
</ednote>
<note role="derivation">
<p>The semantics of the style property
represented by this attribute are based upon that defined by <bibref ref="css3-wm"/>,
represented by this attribute are based upon that defined by <bibref ref="utr50"/> and <bibref ref="css3-wm"/>,
&sect; 5.1.</p>
</note>
</div3>
Expand Down Expand Up @@ -13746,6 +13756,11 @@ as a style property only to those element types indicated in the following table
</table>
<p>If a computed value of the property associated with this attribute is not supported,
then a <loc href="#terms-presentation-processor">presentation processor</loc> must use the value <code>lrtb</code>.</p>
<note role="elaboration">
<p>A writing mode for which the inline progression direction is left-to-right or right-to-left is referred to
as a <emph>horizontal writing mode</emph>, while a writing mode for which the inline progression direction is
top-to-bottom is referred to as a <emph>vertical writing mode</emph>.</p>
</note>
<p>The <att>tts:writingMode</att> style is illustrated by the following example.</p>
<table id="style-attribute-writingMode-example-1" role="example">
<caption>Example Fragment &ndash; Writing Mode</caption>
Expand Down Expand Up @@ -23788,6 +23803,11 @@ href="http://www.itu.int/">Standard-Frequency and Time-Signal
Emissions</titleref>, International
Telecommunciations Union, Radio Sector (ITU-R).
</bibl>
<bibl id="utr50" key="UTR50">K. Ishii, <titleref
href="http://www.unicode.org/reports/tr50/tr50-17.html">Unicode Vertical Text Layout</titleref>, Unicode Consortium, 23 November 2016. (See
<xspecref
href="http://www.unicode.org/reports/tr50/tr50-17.html">http://www.unicode.org/reports/tr50/tr50-17.html</xspecref>.)
</bibl>
<bibl id="wcag" key="WCAG">Ben Caldwell, et al., Eds.,
<titleref href="http://www.w3.org/TR/2008/REC-WCAG20-20081211/">Web
Content Accessibility Guidelines (WCAG) 2.0</titleref>, W3C Recommendation, 11 December 2008. (See
Expand Down