| Value | Meaning |
|---|---|
| INVALID0 | Initial, unset direction. |
| LTR4 | Text is set horizontally from left to right. |
| RTL5 | Text is set horizontally from right to left. |
| TTB6 | Text is set vertically from top to bottom. |
| BTT7 | Text is set vertically from bottom to top. |
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The direction of a text segment or buffer.
A segment can also be tested for horizontal or vertical orientation (irrespective of specific direction) with HB_DIRECTION_IS_HORIZONTAL() or HB_DIRECTION_IS_VERTICAL().