usvg::parser::text

Function convert_writing_mode

Source 
fn convert_writing_mode(text_node: SvgNode<'_, '_>) -> WritingMode
Expand description

Converts the writing mode.

SVG 2 references CSS Writing Modes Level 3 for the definition of the ‘writing-mode’ property, there are only two writing modes: horizontal left-to-right and vertical right-to-left.

That specification introduces new values for the property. The SVG 1.1 values are obsolete but must still be supported by converting the specified values to computed values as follows:

  • lr, lr-tb, rl, rl-tb => horizontal-tb
  • tb, tb-rl => vertical-rl

The current vertical-lr behaves exactly the same as vertical-rl.

Also, looks like no one really supports the rl and rl-tb, except Batik. And I’m not sure if its behaviour is correct.

So we will ignore it as well, mainly because I have no idea how exactly it should affect the rendering.