/** * 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
**/ typedefenum
{
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'),
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