[Libreoffice-bugs] [Bug 126567] EXPORT: DOCX: DOC: border shadow color/distance not kept, and border distance value changed

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=126567

--- Comment #6 from Mike Kaganski <mikekaganski at hotmail.com> ---
(In reply to Justin L from comment #5)
> I'm not too worried about a 0.80 changing into a 0.75. That can easily be
> due to rounding when converting back and forth from twips or whatever.

Actually it's because in OOXML, the border size is measured in 1/8th of a
point. Citing description of "sz" attribute of CT_Border (ECMA-376 Part 1 sect.
17.3.4):

> If the border style (val attribute) specifies a line border, the width of this border is
> specified in measurements of eighths of a point, with a minimum value of two (onefourth
> of a point) and a maximum value of 96 (twelve points). Any values outside this
> range can be reassigned to a more appropriate value.

The type of the attribute is ST_EighthPointMeasure, which is an unsigned
integer.

So a value of 0.80 pt is rightfully brought to the closest multiple of 1/8th of
a point (sz=6, i.e. 0.75 pt). The other possible value (sz=7) is 0.875 pt,
which is less accurate.

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