font_metrics

font_metrics :: (
    text: *Text_System,
    slot: Font_Slot,
    size: float
) -> Font_Metrics

Ascent, descent and line height of a font slot at size points.

Parameters

text: *Text_System

the text system holding the fonts.

slot: Font_Slot

which font to measure.

size: float

the font size in points.

Returns

Font_Metrics

ui := headless();
defer free_ui(*ui);
metrics := font_metrics(*ui.text, .SANS, 20);
assert(metrics.line_height > 0);