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# PFR Fonts

## Synopsis

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 subpixels. 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 subpixels.

## 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 subpixels (i.e., 1/64th of pixels).