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font/sprite(underline): make undercurl segment symmetrical

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Previously was biased half a pixel to one side.
This commit is contained in:
Qwerasd
2024-10-14 14:53:09 -04:00
parent 63f82119cd
commit 2462921681
1 changed files with 3 additions and 1 deletions
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src/font/sprite/underline.zig
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@ -187,7 +187,9 @@ fn drawCurly(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
// follow Xiaolin Wu's antialias algorithm to draw the curve
var x: u32 = 0;
while (x < width) : (x += 1) {
const t: f64 = @as(f64, @floatFromInt(x)) * wave_period;
// We sample the wave function at the *middle* of each
// pixel column, to ensure that it renders symmetrically.
const t: f64 = (@as(f64, @floatFromInt(x)) + 0.5) * wave_period;
// Use the slope at this location to add thickness to
// the line on this column, counteracting the thinning
// caused by the slope.