Luna::Font::IFontFile::scale_for_pixel_height

virtual f32 scale_for_pixel_height(u32 font_index, f32 pixels)=0

Computes a scale factor to produce a font whose "height" is pixels tall.

Height is measured as the distance from the highest ascender to the lowest descender; in other words, it's equivalent to calling get_vmetrics and computing: scale = pixels / (ascent - descent) so if you prefer to measure height by the ascent only, use a similar calculation.

Parameters

• in font_index

  The index of the font to query.

• in pixels

  The new hight of the font glyphs.

Return value

Returns the scale factor.