[XeTeX] Overriding directionality and mirrored shapes
jfkthame at gmail.com
Fri Sep 22 17:37:10 CEST 2017
On 17/09/2017 20:26, David J. Perry wrote:
> The OpenType spec says that when a layout engine encounters a situation
> where mirrored glyphs are required, it should automatically apply the
> <rtla> or <rtlm> features (assuming they exist in the font). LibreOffice
> and TextEdit / Nisus Writer (latter Mac only) do this. See the "Simple
> RLO Test" screen shot. (BTW: I attached the screen shots. Does this
> list allow images in the body of a message?)
> XeLaTeX does not. It correctly places the characters RTL after inserting
> a right to left override (RLO, U+202E), but the shapes are not mirrored.
> See the minimal example below and the screen shot taken from the output
> PDF. The same font was used to generate both of the screen shots. (If
> you wish to try this for yourself, you will need a font that includes
> both the Old Italic block of Unicode and the appropriate OT features. I
> will share the one I’m making if anybody is really interested.)
Does it work if you explicitly apply the rtla and/or rtlm features (e.g.
using fontspec's RawFeature option)?
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