1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130

use std;
use std::fmt;
use super::pixel::*;
use ::RGB;
use ::RGBA;

impl<T: Clone> RGB<T> {
    /// Convenience function for creating a new pixel
    #[inline(always)]
    pub fn new(r: T, g: T, b: T) -> Self {
        RGB{r:r,g:g,b:b}
    }

    /// Iterate over color components (R, G, and B)
    #[inline(always)]
    pub fn iter(&self) -> std::iter::Cloned<std::slice::Iter<T>> {
        self.as_slice().iter().cloned()
    }

    // Convenience function for converting to RGBA
    #[inline(always)]
    pub fn alpha(&self, a: T) -> RGBA<T> {
        RGBA {
            r:self.r.clone(),
            g:self.g.clone(),
            b:self.b.clone(),
            a:a,
        }
    }

    // Convenience function for converting to RGBA with alpha channel of a different type than type of the pixels
    #[inline(always)]
    pub fn new_alpha<A>(&self, a: A) -> RGBA<T,A> {
        RGBA {
            r:self.r.clone(),
            g:self.g.clone(),
            b:self.b.clone(),
            a:a,
        }
    }
}

impl<T: Copy, B> ComponentMap<RGB<B>, T, B> for RGB<T> {
    #[inline(always)]
    fn map<F>(&self, mut f: F) -> RGB<B>
        where F: FnMut(T) -> B {
        RGB{
            r:f(self.r),
            g:f(self.g),
            b:f(self.b),
        }
    }
}

impl<T> ComponentSlice<T> for RGB<T> {
    #[inline(always)]
    fn as_slice(&self) -> &[T] {
        unsafe {
            std::slice::from_raw_parts(self as *const RGB<T> as *const T, 3)
        }
    }

    #[inline(always)]
    fn as_mut_slice(&mut self) -> &mut [T] {
        unsafe {
            std::slice::from_raw_parts_mut(self as *mut RGB<T> as *mut T, 3)
        }
    }
}

impl<T> ComponentSlice<T> for [RGB<T>] {
    #[inline]
    fn as_slice(&self) -> &[T] {
        unsafe {
            std::slice::from_raw_parts(self.as_ptr() as *const _, self.len() * 3)
        }
    }

    #[inline]
    fn as_mut_slice(&mut self) -> &mut [T] {
        unsafe {
            std::slice::from_raw_parts_mut(self.as_ptr() as *mut _, self.len() * 3)
        }
    }
}

impl<T: Copy> ComponentBytes<T> for [RGB<T>] {}

impl<T> std::iter::FromIterator<T> for RGB<T> {
    /// Takes exactly 3 elements from the iterator and creates a new instance.
    /// Panics if there are fewer elements in the iterator.
    #[inline(always)]
    fn from_iter<I: IntoIterator<Item = T>>(into_iter: I) -> Self {
        let mut iter = into_iter.into_iter();
        RGB{r:iter.next().unwrap(), g:iter.next().unwrap(), b:iter.next().unwrap()}
    }
}

impl<T: fmt::Display> fmt::Display for RGB<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f,"rgb({},{},{})", self.r,self.g,self.b)
    }
}

#[test]
fn rgb_test() {
    let neg = RGB::new(1,2,3i32).map(|x| -x);
    assert_eq!(neg.r, -1);
    assert_eq!(neg.g, -2);
    assert_eq!(neg.b, -3);

    let mut px = RGB::new(3,4,5);
    px.as_mut_slice()[1] = 111;
    assert_eq!(111, px.g);

    assert_eq!(RGBA::new(250,251,252,253), RGB::new(250,251,252).alpha(253));

    assert_eq!(RGB{r:1u8,g:2,b:3}, RGB::new(1u8,2,3));
    assert!(RGB{r:1u8,g:1,b:2} < RGB::new(2,1,1));

    let mut h = std::collections::HashSet::new();
    h.insert(px);
    assert!(h.contains(&RGB::new(3,111,5)));
    assert!(!h.contains(&RGB::new(111,5,3)));

    let v = vec![RGB::new(1u8,2,3), RGB::new(4,5,6)];
    assert_eq!(&[1,2,3,4,5,6], v.as_bytes());

    assert_eq!(RGB::new(0u8,0,0), Default::default());
}