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Merge pull request #2438 from qwerasd205/undercurl-thickness

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Undercurl tweaks
This commit is contained in:
Mitchell Hashimoto
2024-10-14 12:57:11 -07:00
committed by GitHub
parent 10aad444b7 2462921681
commit 9f50ed07a5
1 changed files with 6 additions and 2 deletions
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8
src/font/sprite/underline.zig
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@ -163,7 +163,9 @@ fn drawDashed(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
/// geometry.
fn drawCurly(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
const float_width: f64 = @floatFromInt(width);
const float_thick: f64 = @floatFromInt(thickness);
// 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));
// Calculate the wave period for a single character
// `2 * pi...` = 1 peak per character
@ -185,7 +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.