# FreeType-2.9.1 API Reference

# Parameter Tags

## Synopsis

FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
FT_PARAM_TAG_INCREMENTAL
FT_PARAM_TAG_LCD_FILTER_WEIGHTS
FT_PARAM_TAG_RANDOM_SEED
FT_PARAM_TAG_STEM_DARKENING
FT_PARAM_TAG_UNPATENTED_HINTING

This section contains macros for the FT_Parameter structure that are used with various functions to activate some special functionality or different behaviour of various components of FreeType.

### FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY

    #define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY \
              FT_MAKE_TAG( 'i', 'g', 'p', 'f' )

      /* this constant is deprecated */
    #define FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY \
              FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY

A tag for FT_Parameter to make FT_Open_Face ignore typographic family names in the ‘name’ table (introduced in OpenType version 1.4). Use this for backward compatibility with legacy systems that have a four-faces-per-family restriction.

#### since

2.8

### FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY

    #define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY \
              FT_MAKE_TAG( 'i', 'g', 'p', 's' )

      /* this constant is deprecated */
    #define FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY \
              FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY

A tag for FT_Parameter to make FT_Open_Face ignore typographic subfamily names in the ‘name’ table (introduced in OpenType version 1.4). Use this for backward compatibility with legacy systems that have a four-faces-per-family restriction.

#### since

2.8

### FT_PARAM_TAG_INCREMENTAL

    #define FT_PARAM_TAG_INCREMENTAL \
              FT_MAKE_TAG( 'i', 'n', 'c', 'r' )

An FT_Parameter tag to be used with FT_Open_Face to indicate incremental glyph loading.

### FT_PARAM_TAG_LCD_FILTER_WEIGHTS

    #define FT_PARAM_TAG_LCD_FILTER_WEIGHTS \
              FT_MAKE_TAG( 'l', 'c', 'd', 'f' )

An FT_Parameter tag to be used with FT_Face_Properties. The corresponding argument specifies the five LCD filter weights for a given face (if using FT_LOAD_TARGET_LCD, for example), overriding the global default values or the values set up with FT_Library_SetLcdFilterWeights.

#### since

2.8

### FT_PARAM_TAG_RANDOM_SEED

    #define FT_PARAM_TAG_RANDOM_SEED \
              FT_MAKE_TAG( 's', 'e', 'e', 'd' )

An FT_Parameter tag to be used with FT_Face_Properties. The corresponding 32bit signed integer argument overrides the font driver's random seed value with a face-specific one; see random-seed.

#### since

2.8

### FT_PARAM_TAG_STEM_DARKENING

    #define FT_PARAM_TAG_STEM_DARKENING \
              FT_MAKE_TAG( 'd', 'a', 'r', 'k' )

An FT_Parameter tag to be used with FT_Face_Properties. The corresponding Boolean argument specifies whether to apply stem darkening, overriding the global default values or the values set up with FT_Property_Set (see no-stem-darkening).

This is a passive setting that only takes effect if the font driver or autohinter honors it, which the CFF, Type 1, and CID drivers always do, but the autohinter only in ‘light’ hinting mode (as of version 2.9).

#### since

2.8

### FT_PARAM_TAG_UNPATENTED_HINTING

    #define FT_PARAM_TAG_UNPATENTED_HINTING \
              FT_MAKE_TAG( 'u', 'n', 'p', 'a' )

Deprecated, no effect.

Previously: A constant used as the tag of an FT_Parameter structure to indicate that unpatented methods only should be used by the TrueType bytecode interpreter for a typeface opened by FT_Open_Face.