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use core::ops;
use core::mem;
use core::slice;
use internal::pixel::*;
#[repr(C)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct BGR<ComponentType> {
pub b: ComponentType,
pub g: ComponentType,
pub r: ComponentType,
}
#[repr(C)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct BGRA<ComponentType, AlphaComponentType = ComponentType> {
pub b: ComponentType,
pub g: ComponentType,
pub r: ComponentType,
pub a: AlphaComponentType,
}
pub type BGR8 = BGR<u8>;
pub type BGR16 = BGR<u16>;
pub type BGRA8 = BGRA<u8>;
pub type BGRA16 = BGRA<u16>;
#[repr(C)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Gray<ComponentType>(
pub ComponentType);
#[repr(C)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct GrayAlpha<ComponentType, AlphaComponentType = ComponentType>(
pub ComponentType,
pub AlphaComponentType);
pub type GRAY8 = Gray<u8>;
pub type GRAY16 = Gray<u16>;
pub type GRAYA8 = GrayAlpha<u8>;
pub type GRAYA16 = GrayAlpha<u16>;
impl<T> ops::Deref for Gray<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
impl<T: Copy> From<T> for Gray<T> {
fn from(component: T) -> Self {
Gray(component)
}
}
impl<T: Clone, A> GrayAlpha<T, A> {
#[inline(always)]
pub fn gray(&self) -> Gray<T> {
Gray(self.0.clone())
}
}
impl<T, A> GrayAlpha<T, A> {
#[inline(always)]
pub fn gray_mut(&mut self) -> &mut Gray<T> {
unsafe {
mem::transmute(self)
}
}
}
impl<T: Copy, A: Clone> GrayAlpha<T, A> {
#[inline(always)]
pub fn map_gray<F, U, B>(&self, f: F) -> GrayAlpha<U, B>
where F: FnOnce(T) -> U, U: Clone, B: From<A> + Clone {
GrayAlpha(f(self.0.clone()), self.1.clone().into())
}
}
impl<T: Copy, B> ComponentMap<GrayAlpha<B>, T, B> for GrayAlpha<T> {
#[inline(always)]
fn map<F>(&self, mut f: F) -> GrayAlpha<B>
where
F: FnMut(T) -> B,
{
GrayAlpha(f(self.0), f(self.1))
}
}
impl<T> ComponentSlice<T> for GrayAlpha<T> {
#[inline(always)]
fn as_slice(&self) -> &[T] {
unsafe {
slice::from_raw_parts(self as *const Self as *const T, 2)
}
}
#[inline(always)]
fn as_mut_slice(&mut self) -> &mut [T] {
unsafe {
slice::from_raw_parts_mut(self as *mut Self as *mut T, 2)
}
}
}
impl<T> ComponentSlice<T> for [GrayAlpha<T>] {
#[inline]
fn as_slice(&self) -> &[T] {
unsafe {
slice::from_raw_parts(self.as_ptr() as *const _, self.len() * 2)
}
}
#[inline]
fn as_mut_slice(&mut self) -> &mut [T] {
unsafe {
slice::from_raw_parts_mut(self.as_ptr() as *mut _, self.len() * 2)
}
}
}
impl<T: Copy + Send + Sync + 'static> ComponentBytes<T> for [GrayAlpha<T>] {}
impl<T> ComponentSlice<T> for Gray<T> {
#[inline(always)]
fn as_slice(&self) -> &[T] {
unsafe {
slice::from_raw_parts(self as *const Self as *const T, 1)
}
}
#[inline(always)]
fn as_mut_slice(&mut self) -> &mut [T] {
unsafe {
slice::from_raw_parts_mut(self as *mut Self as *mut T, 1)
}
}
}
impl<T> ComponentSlice<T> for [Gray<T>] {
#[inline]
fn as_slice(&self) -> &[T] {
unsafe {
slice::from_raw_parts(self.as_ptr() as *const _, self.len())
}
}
#[inline]
fn as_mut_slice(&mut self) -> &mut [T] {
unsafe {
slice::from_raw_parts_mut(self.as_ptr() as *mut _, self.len())
}
}
}
impl<T: Copy + Send + Sync + 'static> ComponentBytes<T> for [Gray<T>] {}
impl<T: Copy> From<Gray<T>> for GrayAlpha<T, u8> {
fn from(other: Gray<T>) -> Self {
GrayAlpha(other.0, 0xFF)
}
}
impl<T: Copy> From<Gray<T>> for GrayAlpha<T, u16> {
fn from(other: Gray<T>) -> Self {
GrayAlpha(other.0, 0xFFFF)
}
}
#[test]
fn gray() {
let rgb: ::RGB<_> = Gray(1).into();
assert_eq!(rgb.r, 1);
assert_eq!(rgb.g, 1);
assert_eq!(rgb.b, 1);
let g: GRAY8 = 100.into();
assert_eq!(110, *g + 10);
assert_eq!(110, 10 + Gray(100).as_ref());
let ga: GRAYA8 = GrayAlpha(1, 2);
assert_eq!(ga.gray(), Gray(1));
let mut g2 = ga.clone();
*g2.gray_mut() = Gray(3);
assert_eq!(g2.map_gray(|g| g+1), GrayAlpha(4, 2));
assert_eq!(g2.map(|g| g+1), GrayAlpha(4, 3));
assert_eq!(g2.0, 3);
assert_eq!(g2.as_slice(), &[3, 2]);
assert_eq!(g2.as_mut_slice(), &[3, 2]);
assert_eq!((&[Gray(1u16), Gray(2)][..]).as_slice(), &[1, 2]);
assert_eq!((&[GrayAlpha(1u16, 2), GrayAlpha(3, 4)][..]).as_slice(), &[1, 2, 3, 4]);
let rgba: ::RGBA<_> = ga.into();
assert_eq!(rgba.r, 1);
assert_eq!(rgba.g, 1);
assert_eq!(rgba.b, 1);
assert_eq!(rgba.a, 2);
let ga: GRAYA16 = GrayAlpha(1,2);
let rgba: ::RGBA<u16, u16> = ga.into();
assert_eq!(rgba.r, 1);
assert_eq!(rgba.g, 1);
assert_eq!(rgba.b, 1);
assert_eq!(rgba.a, 2);
}