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[font] Document synthetic boldness APIs

This commit is contained in:
Matthias Clasen 2023-02-02 08:15:02 +01:00 committed by Behdad Esfahbod
parent 2119eab69f
commit 061f995845
1 changed files with 31 additions and 0 deletions
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31
src/hb-font.cc
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@ -2448,6 +2448,27 @@ hb_font_get_ptem (hb_font_t *font)
return font->ptem;
}
/**
* hb_font_set_synthetic_bold:
* @font: #hb_font_t to work upon
* @x_embolden: the amount to embolden horizontally
* @y_embolden: the amount to embolden vertically
*
* Sets the "synthetic boldness" of a font.
*
* Positive values make a font bolder, negative values
* thinner. Typical values are in the 0.01 to 0.05 range.
* The default value is zero.
*
* Synthetic boldness is applied by offsetting the contour
* points of the glyph shape.
*
* HarfBuzz applies synthetic boldness when rendering a glyph
* via hb_font_draw_glyph(), and also uses the values to adjust
* the advance width of emboldened glyphs.
*
* Since: REPLACEME
**/
void
hb_font_set_synthetic_bold (hb_font_t *font, float x_embolden, float y_embolden)
{
@ -2465,6 +2486,16 @@ hb_font_set_synthetic_bold (hb_font_t *font, float x_embolden, float y_embolden)
font->mults_changed ();
}
/**
* hb_font_get_synthetic_bold:
* @font: #hb_font_t to work upon
* @x_embolden: return location for horizontal value
* @y_embolden: return location for vertical value
*
* Fetches the "synthetic boldness" of a font.
*
* Since: REPLACEME
**/
void
hb_font_get_synthetic_bold (hb_font_t *font, float *x_embolden, float *y_embolden)
{