82 lines
3.3 KiB
C
82 lines
3.3 KiB
C
/*
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* Copyright © 2019 Ebrahim Byagowi
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#if !defined(HB_H_IN) && !defined(HB_NO_SINGLE_HEADER_ERROR)
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#error "Include <hb.h> instead."
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#endif
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#ifndef HB_STYLE_H
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#define HB_STYLE_H
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#include "hb.h"
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HB_BEGIN_DECLS
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/**
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* hb_style_tag_t:
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* @HB_STYLE_TAG_ITALIC: Used to vary between non-italic and italic.
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* A value of 0 can be interpreted as "Roman" (non-italic); a value of 1 can
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* be interpreted as (fully) italic.
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* @HB_STYLE_TAG_OPTICAL_SIZE: Used to vary design to suit different text sizes.
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* Non-zero. Values can be interpreted as text size, in points.
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* @HB_STYLE_TAG_SLANT_ANGLE: Used to vary between upright and slanted text. Values
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* must be greater than -90 and less than +90. Values can be interpreted as
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* the angle, in counter-clockwise degrees, of oblique slant from whatever the
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* designer considers to be upright for that font design. Typical right-leaning
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* Italic fonts have a negative slant angle (typically around -12)
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* @HB_STYLE_TAG_SLANT_RATIO: same as @HB_STYLE_TAG_SLANT_ANGLE expression as ratio.
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* Typical right-leaning Italic fonts have a positive slant ratio (typically around 0.2)
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* @HB_STYLE_TAG_WIDTH: Used to vary width of text from narrower to wider.
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* Non-zero. Values can be interpreted as a percentage of whatever the font
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* designer considers “normal width” for that font design.
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* @HB_STYLE_TAG_WEIGHT: Used to vary stroke thicknesses or other design details
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* to give variation from lighter to blacker. Values can be interpreted in direct
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* comparison to values for usWeightClass in the OS/2 table,
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* or the CSS font-weight property.
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*
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* Defined by [OpenType Design-Variation Axis Tag Registry](https://docs.microsoft.com/en-us/typography/opentype/spec/dvaraxisreg).
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*
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* Since: 3.0.0
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**/
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typedef enum
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{
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HB_STYLE_TAG_ITALIC = HB_TAG ('i','t','a','l'),
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HB_STYLE_TAG_OPTICAL_SIZE = HB_TAG ('o','p','s','z'),
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HB_STYLE_TAG_SLANT_ANGLE = HB_TAG ('s','l','n','t'),
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HB_STYLE_TAG_SLANT_RATIO = HB_TAG ('S','l','n','t'),
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HB_STYLE_TAG_WIDTH = HB_TAG ('w','d','t','h'),
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HB_STYLE_TAG_WEIGHT = HB_TAG ('w','g','h','t'),
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/*< private >*/
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_HB_STYLE_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
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} hb_style_tag_t;
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HB_EXTERN float
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hb_style_get_value (hb_font_t *font, hb_style_tag_t style_tag);
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HB_END_DECLS
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#endif /* HB_STYLE_H */
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