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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., 1/64^th of pixels).