## Printer Device Driver

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### prda_BackMapChar

Determines what code point in the current code page corresponds to a given glyph (character pattern). If a match is found, this function returns it. If no match is found, it returns -1. If there is no code page vector, this font does not offer Winthorn multi-code page support. In this case, the provided glyph ID is simply returned as the code point.