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🧹 make strikethrough calculation slightly clearer

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followup to https://github.com/mitchellh/ghostty/pull/1796
the sources of the strikethrough calculation are made more explicit
here: the ascent and the subtraction of the leading
This commit is contained in:
Peter Cardenas
2024-05-25 18:06:11 -07:00
parent c84c63877c
commit e56acef775
1 changed files with 4 additions and 5 deletions
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9
src/font/face/coretext.zig
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@ -514,16 +514,15 @@ pub const Face = struct {
const cell_baseline = @ceil(layout_metrics.height - layout_metrics.ascent); const cell_baseline = @ceil(layout_metrics.height - layout_metrics.ascent);
const underline_thickness = @ceil(@as(f32, @floatCast(ct_font.getUnderlineThickness()))); const underline_thickness = @ceil(@as(f32, @floatCast(ct_font.getUnderlineThickness())));
const strikethrough_position = strikethrough_position: { const strikethrough_position = strikethrough_position: {
// This is the height above baseline consumed by text. To get // This is the height above baseline consumed by text. We must take
// this, its cell height minus baseline. We must also take into // into account that our cell height splits the leading between two
// account that our cell height splits the leading between two
// rows so we subtract leading space (blank space). // rows so we subtract leading space (blank space).
const above = cell_height - cell_baseline - (layout_metrics.leading / 2); const text_height_above_baseline = layout_metrics.ascent - (layout_metrics.leading / 2);
// We want to position the strikethrough at 65% of the height. // We want to position the strikethrough at 65% of the height.
// This generally gives a nice visual appearance. The number 65% // This generally gives a nice visual appearance. The number 65%
// is somewhat arbitrary but is a common value across terminals. // is somewhat arbitrary but is a common value across terminals.
const pos = above * 0.65; const pos = text_height_above_baseline * 0.65;
break :strikethrough_position @ceil(pos); break :strikethrough_position @ceil(pos);
}; };