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| author | Kirill Chibisov <contact@kchibisov.com> | 2023-11-24 23:57:43 +0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-11-24 23:57:43 +0400 |
| commit | 54889fc4ff117f59efb392955a18b414fee570c7 (patch) | |
| tree | 7735c38ce117aea965218402dfd3b323757b9649 | |
| parent | 3bb4fb78b4e433c6176fa4422134e38fecc9ede3 (diff) | |
| download | alacritty-54889fc4ff117f59efb392955a18b414fee570c7.tar.gz alacritty-54889fc4ff117f59efb392955a18b414fee570c7.zip | |
Make AA stronger for undercurl
This improves undercurl rendering preserving its original thickness.
This also makes it look not out-of place when places next to other
lines.
| -rw-r--r-- | alacritty/res/rect.f.glsl | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/alacritty/res/rect.f.glsl b/alacritty/res/rect.f.glsl index 65701da3..9951861f 100644 --- a/alacritty/res/rect.f.glsl +++ b/alacritty/res/rect.f.glsl @@ -45,7 +45,11 @@ color_t draw_undercurl(float_t x, float_t y) { // cosine curve. float_t alpha = 1.; if (y > undercurlTop || y < undercurlBottom) { - alpha = 1. - min(abs(undercurlTop - y), abs(undercurlBottom - y)); + // Doing proper SDF is complicated for this shader, so just make AA + // stronger by 1/x^2, which renders preserving underline thickness and + // being bold enough. + float_t dst = min(abs(undercurlTop - y), abs(undercurlBottom - y)); + alpha -= dst * dst; } // The result is an alpha mask on a rect, which leaves only curve opaque. |