Normalize a user-facing backend name to its canonical identifier.
The text renderer is selected by 'text' (preferred) or 'ascii' (compatibility alias for the ASCII charset). Both map to the internal 'ascii' canvas, which carries the ASCII charset mode.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | backend_name |