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coretext: tweak underline position

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This commit is contained in:
Mitchell Hashimoto
2023-07-01 10:12:29 -07:00
parent 51e42a62ed
commit 126817cac2
1 changed files with 7 additions and 2 deletions
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9
src/font/face/coretext.zig
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@ -423,12 +423,17 @@ pub const Face = struct {
// All of these metrics are based on our layout above.
const cell_height = layout_metrics.height;
const cell_baseline = layout_metrics.ascent;
const underline_position = @ceil(layout_metrics.ascent -
@as(f32, @floatCast(ct_font.getUnderlinePosition())));
const underline_thickness = @ceil(@as(f32, @floatCast(ct_font.getUnderlineThickness())));
const strikethrough_position = cell_baseline * 0.6;
const strikethrough_thickness = underline_thickness;
// Underline position is based on our baseline because the font advertised
// underline position is based on a zero baseline. We add a small amount
// to the underline position to make it look better.
const underline_position = @ceil(cell_baseline -
@as(f32, @floatCast(ct_font.getUnderlinePosition())) +
1);
// Note: is this useful?
// const units_per_em = ct_font.getUnitsPerEm();
// const units_per_point = @intToFloat(f64, units_per_em) / ct_font.getSize();