| /* |
| * 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 */ |
