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feat(core): introduce new color functions

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This commit is contained in:
cepetr 2024-02-21 08:26:42 +01:00
parent 342b970ba6
commit 7b786ed089
1 changed files with 24 additions and 0 deletions
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24
core/embed/rust/src/ui/display/color.rs
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@ -86,6 +86,30 @@ impl Color {
pub const fn black() -> Self {
Self::rgb(0, 0, 0)
}
/// Blends the color of `self` with the color of `fg` using specified
/// `alpha` value (ranging from 0 to 255).
///
/// If `alpha` equals 0, the background color (`self`) is used.
/// If `alpha` equals 255, the foreground color (`fg`) is used.
pub fn blend(self, fg: Color, alpha: u8) -> Color {
let alpha = alpha as u16;
let fg_r: u16 = (fg.to_u16() & 0xF800) >> 11;
let bg_r: u16 = (self.to_u16() & 0xF800) >> 11;
let r = (fg_r * alpha + (bg_r * (255 - alpha))) / 255;
let fg_g: u16 = (fg.to_u16() & 0x07E0) >> 5;
let bg_g: u16 = (self.to_u16() & 0x07E0) >> 5;
let g = (fg_g * alpha + (bg_g * (255 - alpha))) / 255;
let fg_b: u16 = fg.to_u16() & 0x001F;
let bg_b: u16 = self.to_u16() & 0x001F;
let b = (fg_b * alpha + (bg_b * (255 - alpha))) / 255;
((r << 11) | (g << 5) | b).into()
}
}
impl Lerp for Color {