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Add basic dimming functionality #2751

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Add basic dimming functionality #2751

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8d367d9
adds basic dimming functionality
farwyler Jun 11, 2022
f6d9376
fix clippy lint issue
farwyler Jun 11, 2022
68d76a2
simplifys implementation & removes palette dependency.
farwyler Jun 14, 2022
449ce13
adds dimming documentation
farwyler Jun 14, 2022
273e609
don't dim behind child content
farwyler Jun 14, 2022
ccbd0d7
Update helix-tui/src/buffer.rs
farwyler Jun 17, 2022
e6ac344
expand alpha range for new shade function
farwyler Jun 17, 2022
764540f
removes caching in dim function
farwyler Jun 17, 2022
08bf7bd
remove unnecessary derives from color
farwyler Jun 17, 2022
52b9065
remove unused imports
farwyler Jun 17, 2022
a94db20
Update helix-tui/src/buffer.rs
farwyler Jun 20, 2022
bb4fec7
implements ad hoc dimming
farwyler Jun 29, 2022
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Update helix-tui/src/buffer.rs 
Co-authored-by: yvt <[email protected]>
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@farwyler @yvt
farwyler and yvt committed Jul 2, 2022
commit ccbd0d7131736ccebb58392c8baf05b2d5a3ff27
12 changes: 4 additions & 8 deletions helix-tui/src/buffer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -590,14 +590,10 @@ impl Buffer {
/// shade < 0 -> darken rgb color
/// shade > 0 -> lighten rgb color
pub fn dim(&mut self, area: Rect, shade: i8) {
let shade_amount = shade.unsigned_abs().saturating_mul(2);
let shade_fn = if shade < 0 {
u8::saturating_sub
} else {
u8::saturating_add
};
// TODO: replace with saturating_add_signed when mixed_integer_ops (https://github.com/rust-lang/rust/issues/87840) get stabilized.
let shaded = |v| shade_fn(v, shade_amount);
let alpha = i32::from(shade).unsigned_abs();
let (src_factor, dst_factor) = (alpha, 256 - alpha);
let src = if shade > 0 { 255u32 } else { 0u32 } * src_factor;
let shaded = |dst_color: u8| ((u32::from(dst_color) * dst_factor + src) >> 8) as u8;

let mut cache: HashMap<Color, Color> = HashMap::new();
let mut modify = |col| {
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