FT_GASP_XXX

Defined in FT_GASP_H (freetype/ftgasp.h).

#define FT_GASP_NO_TABLE               -1
#define FT_GASP_DO_GRIDFIT           0x01
#define FT_GASP_DO_GRAY              0x02
#define FT_GASP_SYMMETRIC_SMOOTHING  0x08
#define FT_GASP_SYMMETRIC_GRIDFIT    0x10

A list of values and/or bit-flags returned by the FT_Get_Gasp function.

values

FT_GASP_NO_TABLE	This special value means that there is no GASP table in this face. It is up to the client to decide what to do.
FT_GASP_DO_GRIDFIT	Grid-fitting and hinting should be performed at the specified ppem. This really means TrueType bytecode interpretation. If this bit is not set, no hinting gets applied.
FT_GASP_DO_GRAY	Anti-aliased rendering should be performed at the specified ppem. If not set, do monochrome rendering.
FT_GASP_SYMMETRIC_SMOOTHING	If set, smoothing along multiple axes must be used with ClearType.
FT_GASP_SYMMETRIC_GRIDFIT	Grid-fitting must be used with ClearType's symmetric smoothing.

note

The bit-flags ‘FT_GASP_DO_GRIDFIT’ and ‘FT_GASP_DO_GRAY’ are to be used for standard font rasterization only. Independently of that, ‘FT_GASP_SYMMETRIC_SMOOTHING’ and ‘FT_GASP_SYMMETRIC_GRIDFIT’ are to be used if ClearType is enabled (and ‘FT_GASP_DO_GRIDFIT’ and ‘FT_GASP_DO_GRAY’ are consequently ignored).

‘ClearType’ is Microsoft's implementation of LCD rendering, partly protected by patents.

since

2.3.0

---

[Index]

[Top]

[TOC]

FT_Get_Gasp

Defined in FT_GASP_H (freetype/ftgasp.h).

  FT_EXPORT( FT_Int )
  FT_Get_Gasp( FT_Face  face,
               FT_UInt  ppem );

Read the ‘gasp’ table from a TrueType or OpenType font file and return the entry corresponding to a given character pixel size.

input

face	The source face handle.
ppem	The vertical character pixel size.

return

Bit flags (see FT_GASP_XXX), or FT_GASP_NO_TABLE if there is no ‘gasp’ table in the face.

since

2.3.0

---

[Index]

[Top]

[TOC]