Summary
Proposal owner: Miklos Vajna
Proposal short name: Opacity text property
Rationale
Use cases:
Users sometimes want to make a whole shape partially transparent. Currently ODF provides a way to make the shape area / background and the line / border semi-transparent, but the text can only have an RGB color.
Alternatives considered:
It is possible to manually convert text to a bitmap, and then bitmaps can be transparent.
Requested changes to the ODF Standard
Text changes/additions (compared to ODF 1.2):
16.27.28 <style:text-properties> (changed section)
The <style:text-properties> element has the following attributes: ... existing list ..., 16.40.7 <draw:opacity>.
Schema changes/additions:
<rng:define name="style-text-properties-attlist">
<rng:interleave>
<rng:optional>
<rng:attribute name="draw:opacity">
<rng:ref name="zeroToHundredPercent"/>
</rng:attribute>
</rng:optional>
</rng:interleave>
</rng:define>
In other words, allow the existing draw:opacity as a new style:text-properties attribute.
Impacts
Conformance:
This proposal will not add any mandatory features or behaviors.
Backwards compatibility:
This change will not impact existing ODF processors, the usage of the new attribute value is optional.
Accessibility impact:
This change will not impact accessibility.
Interoperability:
OOXML's drawingML has a
{{<a:r>}}
{{ <a:rPr>}}
{{ <a:solidFill>}}
{{ <a:srgbClr val="FF0000">}}
{{ <a:alpha val="25000"/>}}
{{ </a:srgbClr>}}
{{ </a:solidFill>}}
{{ </a:rPr>}}
{{ <a:t>Hello!</a:t>}}
{{ </a:r>}}
markup to describe the same, this proposal allows roundtripping that feature in ODF.
LibreOffice 6.5 implements this rendering feature in its ODF extension namespace. It is enabled for ODG and ODP files at the moment.
New Feature
Major