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No negative values for tts:disparity #370

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spoeschel opened this issue Apr 25, 2018 · 3 comments
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No negative values for tts:disparity #370

spoeschel opened this issue Apr 25, 2018 · 3 comments
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@palemieux
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bug imsc1.1
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imsc1.1 CR2

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@spoeschel
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In TTML2, the tts:disparity attribute value is defined to be <length>. However IMSC 1.1 prohibits the feature #length-negative i.e. negative lengths. So there can be no content in front of the plane of display, as this would require a negative length value.

Is this intentional?
@nigelmegitt
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Good catch! No, it is not intentional.

@palemieux palemieux added this to the imsc1.1 PR milestone Apr 25, 2018
@mikedo
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mikedo commented Apr 25, 2018

Right. (A general reminder that the syntax and semantics of this attribute were intended to be compatible with CTA 708.1.)

@nigelmegitt
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the syntax and semantics of this attribute were intended to be compatible with CTA 708.1.

yes, and ETSI EN 300 743 v1.5.1 (PDF)

@palemieux palemieux self-assigned this May 21, 2018
@spoeschel spoeschel mentioned this issue Jun 19, 2018
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palemieux added a commit that referenced this issue Jun 21, 2018
@palemieux
Refactor feature lists per TTML2 CR2 (#390, #393)
8f1861e 
Add support for negative values (#370, #394)
Clarify support for #textOrientation-sideways-LR (#373)
Added #extent-length (#382)
Move tts:position constraints to Text Profile (#392)
Fix localBiblio bug
@palemieux palemieux mentioned this issue Jun 21, 2018
Merged
palemieux added a commit that referenced this issue Jun 28, 2018
@palemieux
Refactor feature lists per TTML2 CR2 (#390, #393)
9ee066f 
Add support for negative values (#370, #394)
Clarify support for #textOrientation-sideways-LR (#373)
Added #extent-length (#382)
Move tts:position constraints to Text Profile (#392)
Fix localBiblio bug
Replace tts:fontShear with tts:shear and tts:lineShear (#401)
@palemieux palemieux removed the pr open label Jun 29, 2018
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@mikedo @palemieux @nigelmegitt @spoeschel