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/****************************************************************************
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*
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* ftparams.h
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*
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* FreeType API for possible FT_Parameter tags (specification only).
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*
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* Copyright (C) 2017-2019 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#ifndef FTPARAMS_H_
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#define FTPARAMS_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @section:
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* parameter_tags
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*
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* @title:
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* Parameter Tags
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*
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* @abstract:
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* Macros for driver property and font loading parameter tags.
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*
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* @description:
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* This section contains macros for the @FT_Parameter structure that are
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* used with various functions to activate some special functionality or
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* different behaviour of various components of FreeType.
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*
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*/
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
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*
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* @description:
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* A tag for @FT_Parameter to make @FT_Open_Face ignore typographic
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* family names in the 'name' table (introduced in OpenType version 1.4).
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* Use this for backward compatibility with legacy systems that have a
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* four-faces-per-family restriction.
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*
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* @since:
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* 2.8
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*
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*/
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#define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY \
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FT_MAKE_TAG( 'i', 'g', 'p', 'f' )
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/* this constant is deprecated */
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#define FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY \
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FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
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*
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* @description:
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* A tag for @FT_Parameter to make @FT_Open_Face ignore typographic
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* subfamily names in the 'name' table (introduced in OpenType version
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* 1.4). Use this for backward compatibility with legacy systems that
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* have a four-faces-per-family restriction.
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*
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* @since:
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* 2.8
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*
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*/
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#define FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY \
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FT_MAKE_TAG( 'i', 'g', 'p', 's' )
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/* this constant is deprecated */
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#define FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY \
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FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_INCREMENTAL
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*
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* @description:
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* An @FT_Parameter tag to be used with @FT_Open_Face to indicate
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* incremental glyph loading.
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*
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*/
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#define FT_PARAM_TAG_INCREMENTAL \
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FT_MAKE_TAG( 'i', 'n', 'c', 'r' )
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_LCD_FILTER_WEIGHTS
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*
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* @description:
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* An @FT_Parameter tag to be used with @FT_Face_Properties. The
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* corresponding argument specifies the five LCD filter weights for a
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* given face (if using @FT_LOAD_TARGET_LCD, for example), overriding the
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* global default values or the values set up with
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* @FT_Library_SetLcdFilterWeights.
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*
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* @since:
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* 2.8
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*
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*/
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#define FT_PARAM_TAG_LCD_FILTER_WEIGHTS \
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FT_MAKE_TAG( 'l', 'c', 'd', 'f' )
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_RANDOM_SEED
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*
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* @description:
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* An @FT_Parameter tag to be used with @FT_Face_Properties. The
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* corresponding 32bit signed integer argument overrides the font
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* driver's random seed value with a face-specific one; see @random-seed.
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*
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* @since:
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* 2.8
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*
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*/
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#define FT_PARAM_TAG_RANDOM_SEED \
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FT_MAKE_TAG( 's', 'e', 'e', 'd' )
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_STEM_DARKENING
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*
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* @description:
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* An @FT_Parameter tag to be used with @FT_Face_Properties. The
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* corresponding Boolean argument specifies whether to apply stem
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* darkening, overriding the global default values or the values set up
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* with @FT_Property_Set (see @no-stem-darkening).
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*
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* This is a passive setting that only takes effect if the font driver or
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* autohinter honors it, which the CFF, Type~1, and CID drivers always
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* do, but the autohinter only in 'light' hinting mode (as of version
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* 2.9).
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*
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* @since:
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* 2.8
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*
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*/
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#define FT_PARAM_TAG_STEM_DARKENING \
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FT_MAKE_TAG( 'd', 'a', 'r', 'k' )
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/**************************************************************************
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*
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* @enum:
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* FT_PARAM_TAG_UNPATENTED_HINTING
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*
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* @description:
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* Deprecated, no effect.
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*
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* Previously: A constant used as the tag of an @FT_Parameter structure
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* to indicate that unpatented methods only should be used by the
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* TrueType bytecode interpreter for a typeface opened by @FT_Open_Face.
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*
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*/
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#define FT_PARAM_TAG_UNPATENTED_HINTING \
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FT_MAKE_TAG( 'u', 'n', 'p', 'a' )
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/* */
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FT_END_HEADER
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#endif /* FTPARAMS_H_ */
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/* END */
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