agg-gui 0.1.0

A Rust GUI framework built on AGG — immediate-mode widgets, Y-up layout, halo-AA rendering via tess2
Documentation 
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//! Color type for agg-gui.
//!
//! Colors are stored as f32 RGBA in linear space. Conversion to AGG's `Rgba8`
//! happens at the rasterizer boundary.

use agg_rust::color::Rgba8;

/// An RGBA color with f32 components in [0.0, 1.0].
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Color {
    pub r: f32,
    pub g: f32,
    pub b: f32,
    pub a: f32,
}

impl Color {
    pub const fn rgba(r: f32, g: f32, b: f32, a: f32) -> Self {
        Self { r, g, b, a }
    }

    pub const fn rgb(r: f32, g: f32, b: f32) -> Self {
        Self { r, g, b, a: 1.0 }
    }

    pub const fn white() -> Self {
        Self::rgb(1.0, 1.0, 1.0)
    }

    pub const fn black() -> Self {
        Self::rgb(0.0, 0.0, 0.0)
    }

    pub const fn transparent() -> Self {
        Self::rgba(0.0, 0.0, 0.0, 0.0)
    }

    pub fn with_alpha(self, a: f32) -> Self {
        Self { a, ..self }
    }

    /// Convert to AGG's 8-bit RGBA format (used at the rasterizer boundary).
    pub(crate) fn to_rgba8(self) -> Rgba8 {
        Rgba8::new(
            (self.r * 255.0).clamp(0.0, 255.0) as u32,
            (self.g * 255.0).clamp(0.0, 255.0) as u32,
            (self.b * 255.0).clamp(0.0, 255.0) as u32,
            (self.a * 255.0).clamp(0.0, 255.0) as u32,
        )
    }
}

impl Default for Color {
    fn default() -> Self {
        Self::black()
    }
}