Name
  doc:UseJPFonts -- enable Japanese fonts
Synopsis

      status = doc:UseJPFonts()

Function
  `doc:UseJPFonts()` enables Japanese fonts. After `doc:UseJPFonts()` has been called, an application can use the following Japanese fonts:

  When `doc:UseJPFonts()` succeeds, it returns `#HPDF_OK`. Otherwise, it returns an error code and the error handler is invoked.

Inputs
  none

Results
  status
    status code
Errors
  `#HPDF_INVALID_DOCUMENT` - An invalid document handle was set.

  `#HPDF_FAILED_TO_ALLOC_MEM` - Memory allocation failed.

  `#HPDF_DUPLICATE_REGISTRATION` - The font of the same name has already been registered.

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