crow 0.7.2

A pixel perfect 2D rendering engine
Documentation 
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//! A collection of useful color matrices.

/// The identity matrix.
pub const IDENTITY: [[f32; 4]; 4] = [
    [1.0, 0.0, 0.0, 0.0],
    [0.0, 1.0, 0.0, 0.0],
    [0.0, 0.0, 1.0, 0.0],
    [0.0, 0.0, 0.0, 1.0],
];

/// Converts an ordinary image into grayscale.
pub const GREYSCALE: [[f32; 4]; 4] = [
    [0.299, 0.587, 0.114, 0.0],
    [0.299, 0.587, 0.114, 0.0],
    [0.299, 0.587, 0.114, 0.0],
    [0.0, 0.0, 0.0, 1.0],
];

/// Uses only the red and alpha channel of an image.
pub const RED: [[f32; 4]; 4] = [
    [1.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 1.0],
];

/// Uses only the green and alpha channel of an image.
pub const GREEN: [[f32; 4]; 4] = [
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 1.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 1.0],
];

/// Uses only the green blue and alpha channel of an image.
pub const BLUE: [[f32; 4]; 4] = [
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 0.0, 0.0],
    [0.0, 0.0, 1.0, 0.0],
    [0.0, 0.0, 0.0, 1.0],
];