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font/sprite: improve double underline legibility with min 2px gap

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At small thicknesses, the legibility of the double underline is not
great when it's a 1px line, a 1px gap, and another 1px line.
This commit is contained in:
Qwerasd
2024-10-05 22:08:17 -04:00
parent 156f735f8d
commit fd49fb7338
1 changed files with 6 additions and 2 deletions
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8
src/font/sprite/underline.zig
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@ -81,7 +81,11 @@ fn drawSingle(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
/// Draw a double underline. /// Draw a double underline.
fn drawDouble(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset { fn drawDouble(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
const height: u32 = thickness * 3; // Our gap between lines will be at least 2px.
// (i.e. if our thickness is 1, we still have a gap of 2)
const gap = @max(2, thickness);
const height: u32 = thickness * 2 * gap;
var canvas = try font.sprite.Canvas.init(alloc, width, height); var canvas = try font.sprite.Canvas.init(alloc, width, height);
canvas.rect(.{ canvas.rect(.{
@ -93,7 +97,7 @@ fn drawDouble(alloc: Allocator, width: u32, thickness: u32) !CanvasAndOffset {
canvas.rect(.{ canvas.rect(.{
.x = 0, .x = 0,
.y = @intCast(thickness * 2), .y = @intCast(thickness + gap),
.width = width, .width = width,
.height = thickness, .height = thickness,
}, .on); }, .on);