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_GRIDFIT 0x04
#define FT_GASP_SYMMETRIC_SMOOTHING 0x08
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
FT_Get_Gasp
Defined in FT_GASP_H (freetype/ftgasp.h).
FT_EXPORT( FT_Int )
FT_Get_Gasp( FT_Face face,
FT_UInt ppem );
For a TrueType or OpenType font file, return the rasterizer behaviour flags from the font's ‘gasp’ table 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.
note
If you want to use the MM functionality of OpenType variation fonts (i.e., using FT_Set_Var_Design_Coordinates and friends), call this function after setting an instance since the return values can change.
since
2.3.0