kc3-lang/harfbuzz/src/hb-style.h

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• Hash : 16b232be
  Author :
  Date : 2022-02-18T18:05:58
  

  [hb-style] Fix the sign of slant ratios
  
  We want negative slant angles to yield
  positive slant ratios. Fix that.
  
  Test included.
  

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• src/hb-style.h

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

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