# FreeType-2.7.1 API Reference

# PFR Fonts

## Synopsis

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

Defined in FT_PFR_H (freetype/ftpfr.h).

      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 );

Return the outline and metrics resolutions of a given PFR face.

#### input

face | Handle to the input face. It can be a non-PFR face.

#### output

aoutline_resolution | Outline resolution. This is equivalent to ‘face->units_per_EM’ for non-PFR fonts. Optional (parameter can be NULL).
ametrics_resolution | Metrics resolution. This is equivalent to ‘outline_resolution’ for non-PFR fonts. 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).

#### return

FreeType error code. 0 means success.

#### 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

Defined in FT_PFR_H (freetype/ftpfr.h).

      FT_EXPORT( FT_Error )
      FT_Get_PFR_Kerning( FT_Face     face,
                          FT_UInt     left,
                          FT_UInt     right,
                          FT_Vector  *avector );

Return 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 | A handle to the input face.
left | Index of the left glyph.
right | Index of the right glyph.

#### output

avector | A kerning vector.

#### return

FreeType error code. 0 means success.

#### 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 returns 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

Defined in FT_PFR_H (freetype/ftpfr.h).

      FT_EXPORT( FT_Error )
      FT_Get_PFR_Advance( FT_Face   face,
                          FT_UInt   gindex,
                          FT_Pos   *aadvance );

Return a given glyph advance, expressed in original metrics units, from a PFR font.

#### input

face | A handle to the input face.
gindex | The glyph index.

#### output

aadvance | The glyph advance in metrics units.

#### return

FreeType 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).