# FreeType-2.1.4 API Reference

# PFR Fonts

## Synopsys

| FT_Get_PFR_Metrics |  | FT_Get_PFR_Kerning |  | FT_Get_PFR_Advance

This section contains the declaration of PFR-specific functions.

#### FT_Get_PFR_Metrics
      FT_EXPORT( FT_Error )
      FT_Get_PFR_Metrics( FT_Face     face,
                          FT_UInt    *aoutline_resolution,
                          FT_UInt    *ametrics_resolution,
                          FT_Fixed   *ametrics_x_scale,
                          FT_Fixed   *ametrics_y_scale );
returns the outline and metrics resolutions of a given PFR face.
input
face | handle to input face. It can be a non-PFR face.
output
aoutline_resolution | outline resolution. This is equivalent to "face->units_per_EM". optional (parameter can be NULL)
ametrics_resolution | metrics_resolution. This is equivalent to "outline_resolution" for non-PFR fonts. can be NULL optional (parameter can be NULL)
ametrics_x_scale | a 16.16 fixed-point number used to scale distance expressed in metrics units to device sub-pixels. This is equivalent to 'face->size->x_scale', but for metrics only. optional (parameter can be NULL)
ametrics_y_scale | same as 'ametrics_x_scale', but for the vertical direction. optional (parameter can be NULL)
note
if the input face is not a PFR, this function will return an error. However, in all cases, it will return valid values.

#### FT_Get_PFR_Kerning
      FT_EXPORT( FT_Error )
      FT_Get_PFR_Kerning( FT_Face     face,
                          FT_UInt     left,
                          FT_UInt     right,
                          FT_Vector  *avector );
returns the kerning pair corresponding to two glyphs in a PFR face. The distance is expressed in metrics units, unlike the result of FT_Get_Kerning
input
face | handle to input face.
left | left glyph index
right | right glyph index
output
avector | kerning vector
note
this function always return distances in original PFR metrics units. This is unlike FT_Get_Kerning with the FT_KERNING_UNSCALED mode, which always return distances converted to outline units. you can use the value of the 'x_scale' and 'y_scale' parameters returned by FT_Get_PFR_Metrics to scale these to device sub-pixels

#### FT_Get_PFR_Advance
      FT_EXPORT( FT_Error )
      FT_Get_PFR_Advance( FT_Face    face,
                          FT_UInt    gindex,
                          FT_Pos    *aadvance );
returns a given glyph advance, expressed in original metrics units, from a PFR font.
input
face | handle to input face.
gindex | glyph index
output
aadvance | glyph advance in metrics units
return
error code. 0 means success
note
you can use the 'x_scale' or 'y_scale' results of FT_Get_PFR_Metrics to convert the advance to device sub-pixels (i.e. 1/64th of pixels)