Re: Padding on tt:p and tt:span elements

i'm afraid it doesn't clear things up; i don't understand what problem you
are trying to solve

On Wed, Apr 25, 2012 at 3:34 AM, Andreas Tai <tai@irt.de> wrote:

>
> Am 24.04.2012 16:23, schrieb Glenn Adams:
>
>
> On Tue, Apr 24, 2012 at 1:41 AM, Andreas Tai <tai@irt.de> wrote:
>
>>  As in TTML a region has always a predefined size, tt:p- and tt:span
>> elements are the better choices to apply a non-transparent background color
>> on a subtitle block that dynamically grows and shrinks with the
>> corresponding text.
>>
>
>  I'm not sure I understand what you mean by "has always a predefined
> size". If by this you mean the "same" size, then I would not agree. A
> region's size (extent) can be changed at any time by using <tt:set>.
>
>
> With "predefined" I wanted to express that the width and the height of the
> region are set before the text is rendered. The values are defined in a
> TTML document by a tts:extent attribute that applies to a region or (if no
> tts:extent attribute applies) by the default value "auto" which means that
> the region has the same width and height as the root container.
>
> Maybe the timing semantic of "predefined" and "before" can be a bit
> misleading here. It is maybe more that the width and height of the region
> are independent of the size of the content that is flowed into the region.
>
> Hope this makes it clearer.
>
>    Unfortunately padding cannot be applied to tt:p and tt:span elements
>> and the very common use case to have empty space between text and the
>> border of a centered "text box" with dynamic width is hard to implement
>> (for an illustration of two use cases see the attached images).
>>
>> Therefore the EBU-Working group that specifies the TTML subset EBU-TT
>> sees the requirements to add padding as an applicable style property for
>> the tt:p and tt:span elements.
>>
>> Best regards,
>>
>> Andreas
>>
>
>
> --
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> Andreas Tai
> Production Systems Television IRT - Institut fuer Rundfunktechnik GmbH
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