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[style] Add HB_STYLE_TAG_SLANT_RATIO

This commit is contained in:
Behdad Esfahbod 2021-09-09 11:19:21 -06:00
parent 201cbe3c66
commit 39c20d2b9e
1 changed files with 15 additions and 0 deletions
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15
src/hb-style.cc
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@ -63,6 +63,7 @@ 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'),
@ -70,6 +71,17 @@ typedef enum
_HB_STYLE_TAG_MAX_VALUE = HB_TAG_MAX_SIGNED /*< skip >*/
} hb_style_tag_t;
static inline float
_hb_angle_to_ratio (float a)
{
return tanf (a * (M_PI / 180.f));
}
static inline float
_hb_ratio_to_angle (float r)
{
return atanf (r) * (180.f / M_PI);
}
/**
* hb_style_get_value:
* @font: a #hb_font_t object.
@ -86,6 +98,9 @@ typedef enum
float
hb_style_get_value (hb_font_t *font, hb_tag_t tag)
{
if (unlikely (tag == HB_STYLE_TAG_SLANT_RATIO))
return _hb_angle_to_ratio (hb_style_get_value (HB_STYLE_TAG_SLANT_ANGLE));
hb_style_tag_t style_tag = (hb_style_tag_t) tag;
hb_face_t *face = font->face;