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//! Raster implementation.
use ::{Raster,RasterMut};
impl<'a> Raster<'a> {
/// Allocate a new raster for the given screen buffer and palette
/// memory slices.
///
/// # Examples
///
/// ```
/// const SCREEN_W: usize = 320;
/// const SCREEN_H: usize = 200;
/// const NUM_COLS: usize = 256;
/// let buf = [0; SCREEN_W * SCREEN_H];
/// let pal = [0; 3 * NUM_COLS];
///
/// flic::Raster::new(SCREEN_W, SCREEN_H, &buf, &pal);
/// ```
pub fn new(w: usize, h: usize, buf: &'a [u8], pal: &'a [u8])
-> Self {
Self::with_offset(0, 0, w, h, w, buf, pal)
}
/// Allocate a new raster for the given screen buffer and palette
/// memory slices, with an offset and stride.
///
/// # Examples
///
/// ```
/// const SCREEN_W: usize = 320;
/// const SCREEN_H: usize = 200;
/// const NUM_COLS: usize = 256;
/// let buf = [0; SCREEN_W * SCREEN_H];
/// let pal = [0; 3 * NUM_COLS];
///
/// flic::Raster::with_offset(0, 0, SCREEN_W, SCREEN_H, SCREEN_W, &buf, &pal);
/// ```
pub fn with_offset(
x: usize, y: usize, w: usize, h: usize, stride: usize,
buf: &'a [u8], pal: &'a [u8])
-> Self {
let x1 = x.checked_add(w).expect("overflow");
let y1 = y.checked_add(h).expect("overflow");
assert!(x < x1 && x1 <= stride && h > 0);
assert!(stride.checked_mul(y1).expect("overflow") <= buf.len());
assert!(pal.len() == 3 * 256);
Raster {
x, y, w, h, stride, buf, pal,
}
}
}
impl<'a> RasterMut<'a> {
/// Allocate a new raster for the given screen buffer and palette
/// memory slices.
///
/// # Examples
///
/// ```
/// const SCREEN_W: usize = 320;
/// const SCREEN_H: usize = 200;
/// const NUM_COLS: usize = 256;
/// let mut buf = [0; SCREEN_W * SCREEN_H];
/// let mut pal = [0; 3 * NUM_COLS];
///
/// flic::RasterMut::new(SCREEN_W, SCREEN_H, &mut buf, &mut pal);
/// ```
pub fn new(w: usize, h: usize, buf: &'a mut [u8], pal: &'a mut [u8])
-> Self {
Self::with_offset(0, 0, w, h, w, buf, pal)
}
/// Allocate a new raster for the given screen buffer and palette
/// memory slices, with an offset and stride.
///
/// # Examples
///
/// ```
/// const SCREEN_W: usize = 320;
/// const SCREEN_H: usize = 200;
/// const NUM_COLS: usize = 256;
/// let mut buf = [0; SCREEN_W * SCREEN_H];
/// let mut pal = [0; 3 * NUM_COLS];
///
/// flic::RasterMut::with_offset(0, 0, SCREEN_W, SCREEN_H, SCREEN_W, &mut buf, &mut pal);
/// ```
pub fn with_offset(
x: usize, y: usize, w: usize, h: usize, stride: usize,
buf: &'a mut [u8], pal: &'a mut [u8])
-> Self {
let x1 = x.checked_add(w).expect("overflow");
let y1 = y.checked_add(h).expect("overflow");
assert!(x < x1 && x1 <= stride && h > 0);
assert!(stride.checked_mul(y1).expect("overflow") <= buf.len());
assert!(pal.len() == 3 * 256);
RasterMut {
x, y, w, h, stride, buf, pal,
}
}
}
#[cfg(test)]
mod tests {
use ::{Raster,RasterMut};
#[test]
#[should_panic]
fn test_raster_overflow() {
let buf = [0; 1];
let pal = [0; 3 * 256];
let _ = Raster::new(
::std::usize::MAX, ::std::usize::MAX, &buf, &pal);
}
#[test]
#[should_panic]
fn test_raster_mut_overflow() {
let mut buf = [0; 1];
let mut pal = [0; 3 * 256];
let _ = RasterMut::new(
::std::usize::MAX, ::std::usize::MAX, &mut buf, &mut pal);
}
}