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font/sprite: undercurl minimum thickness improvement

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Qwerasd
2024-10-17 21:07:52 -04:00
parent d83fce794f
commit 2a4398b319
1 changed files with 5 additions and 1 deletions
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6
src/font/sprite/underline.zig
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@ -165,7 +165,11 @@ fn drawCurly(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
const float_width: f64 = @floatFromInt(width);
// Because of we way we draw the undercurl, we end up making it around 1px
// thicker than it should be, to fix this we just reduce the thickness by 1.
const float_thick: f64 = @floatFromInt(@max(1, thickness -| 1));
//
// We use a minimum thickness of 0.414 because this empirically produces
// the nicest undercurls at 1px underline thickness; thinner tends to look
// too thin compared to straight underlines and has artefacting.
const float_thick: f64 = @max(0.414, @as(f64, @floatFromInt(thickness -| 1)));
// Calculate the wave period for a single character
// `2 * pi...` = 1 peak per character