use clipline crate

Cargo.toml

@@ -18,6 +18,7 @@ vecto = "0.1.0"
 umath = "0.0.7"
 fr = { version = "0.1.1", package = "fer", optional = true }
 stackblur-iter = { version = "0.2.0", features = ["simd"], optional = true }
+clipline = "0.1.1"
 
 [dev-dependencies]
 iai = { git = "https://github.com/bend-n/iai.git" }

benches/drawing.rs

@@ -2,6 +2,12 @@ use fimg::*;
 fn tri() {
     let mut i: Image<_, 4> = fimg::make!(4 channels 1000 x 1000).boxed();
     i.tri((0., 0.), (1000., 500.), (0., 999.), [255, 255, 255, 255]);
-    std::hint::black_box(i);
+    iai::black_box(i);
 }
-iai::main!(tri);
+fn line() {
+    let mut i: Image<_, 4> = fimg::make!(4 channels 500 x 750).boxed();
+    i.line((-50, 20), (550, 800), [255, 165, 0, 255]);
+    i.save("z.png");
+    iai::black_box(i);
+}
+iai::main!(tri, line);

src/convert.rs

@@ -64,12 +64,12 @@ boxconv!(4 => 2);
 boxconv!(4 => 3);
 
 #[inline]
-fn pack([r, g, b, a]: [u8; 4]) -> u32 {
+const fn pack([r, g, b, a]: [u8; 4]) -> u32 {
     ((a as u32) << 24) | ((r as u32) << 16) | ((g as u32) << 8) | (b as u32)
 }
 
 #[inline]
-fn unpack(n: u32) -> [u8; 4] {
+const fn unpack(n: u32) -> [u8; 4] {
     [
         ((n >> 16) & 0xFF) as u8,
         ((n >> 8) & 0xFF) as u8,

src/drawing/line.rs

@@ -1,146 +1,21 @@
 //! adds a `line` function to Image
-#![allow(clippy::missing_docs_in_private_items)]
 use crate::Image;
-use std::iter::Iterator;
 use vecto::Vec2;
 
-/// taken from [bresenham-rs](https://github.com/mbr/bresenham-rs)
-pub struct Bresenham {
-    x: i32,
-    y: i32,
-    dx: i32,
-    dy: i32,
-    x1: i32,
-    diff: i32,
-    octant: Octant,
-}
-
-#[derive(Copy, Clone)]
-struct Octant(u8);
-
-impl Octant {
-    #[inline]
-    const fn from_points(start: (i32, i32), end: (i32, i32)) -> Self {
-        let mut dx = end.0 - start.0;
-        let mut dy = end.1 - start.1;
-
-        let mut octant = 0;
-
-        if dy < 0 {
-            dx = -dx;
-            dy = -dy;
-            octant += 4;
-        }
-
-        if dx < 0 {
-            let tmp = dx;
-            dx = dy;
-            dy = -tmp;
-            octant += 2;
-        }
-
-        if dx < dy {
-            octant += 1;
-        }
-
-        Self(octant)
-    }
-
-    #[inline]
-    const fn to_octant0(self, p: (i32, i32)) -> (i32, i32) {
-        match self.0 {
-            0 => (p.0, p.1),
-            1 => (p.1, p.0),
-            2 => (p.1, -p.0),
-            3 => (-p.0, p.1),
-            4 => (-p.0, -p.1),
-            5 => (-p.1, -p.0),
-            6 => (-p.1, p.0),
-            7 => (p.0, -p.1),
-            _ => unreachable!(),
-        }
-    }
-
-    #[inline]
-    #[allow(clippy::wrong_self_convention)]
-    fn from_octant0(self, p: (i32, i32)) -> (i32, i32) {
-        match self.0 {
-            0 => (p.0, p.1),
-            1 => (p.1, p.0),
-            2 => (-p.1, p.0),
-            3 => (-p.0, p.1),
-            4 => (-p.0, -p.1),
-            5 => (-p.1, -p.0),
-            6 => (p.1, -p.0),
-            7 => (p.0, -p.1),
-            _ => unreachable!(),
-        }
-    }
-}
-
-impl Bresenham {
-    /// Creates a new iterator. Yields intermediate points between `start`
-    /// and `end`. Includes `start` and `end`.
-    #[inline]
-    pub const fn new(start: (i32, i32), end: (i32, i32)) -> Self {
-        let octant = Octant::from_points(start, end);
-
-        let start = octant.to_octant0(start);
-        let end = octant.to_octant0(end);
-
-        let dx = end.0 - start.0;
-        let dy = end.1 - start.1;
-
-        Self {
-            x: start.0,
-            y: start.1,
-            dy,
-            dx,
-            x1: end.0,
-            diff: dy - dx,
-            octant,
-        }
-    }
-}
-
-impl Iterator for Bresenham {
-    type Item = (i32, i32);
-
-    #[inline]
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.x > self.x1 {
-            return None;
-        }
-
-        let p = (self.x, self.y);
-
-        if self.diff >= 0 {
-            self.y += 1;
-            self.diff -= self.dx;
-        }
-
-        self.diff += self.dy;
-
-        // loop inc
-        self.x += 1;
-
-        Some(self.octant.from_octant0(p))
-    }
-}
-
 impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// Draw a line from point a to point b.
     ///
     /// Points not in bounds will not be included.
-    ///
-    /// Uses [bresenshams](https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm) line algorithm.
     pub fn line(&mut self, a: (i32, i32), b: (i32, i32), color: [u8; CHANNELS]) {
-        for (x, y) in Bresenham::new(a, b).map(|(x, y)| (x as u32, y as u32)) {
+        clipline::clipline(
-            if x < self.width() && y < self.height() {
+            ((a.0 as isize, a.1 as isize), (b.0 as isize, b.1 as isize)),
-                // SAFETY: bound are checked ^
+            (
-                unsafe { self.set_pixel(x, y, color) };
+                (0, 0),
-            }
+                (self.width() as isize - 1, self.height() as isize - 1),
-        }
+            ),
+            // SAFETY: clipline clips
+            |x, y| unsafe { self.set_pixel(x as u32, y as u32, color) },
+        );
     }
 
     /// Draw a thick line from point a to point b.
@@ -185,32 +60,12 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     }
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn bresenham() {
-        macro_rules! test_bresenham {
-            ($a:expr, $b:expr => [$(($x:expr, $y:expr)),+]) => {{
-                let mut bi = Bresenham::new($a, $b);
-                $(assert_eq!(bi.next(), Some(($x, $y)));)+
-                assert_eq!(bi.next(), None);
-            }}
-        }
-        test_bresenham!((6, 4), (0, 1) => [(6, 4), (5, 4), (4, 3), (3, 3), (2, 2), (1, 2), (0, 1)]);
-        test_bresenham!((2, 3), (2, 6) => [(2, 3), (2, 4), (2, 5), (2, 6)]);
-        test_bresenham!((2, 3), (5, 3) => [(2, 3), (3, 3), (4, 3), (5, 3)]);
-        test_bresenham!((0, 1), (6, 4) => [(0, 1), (1, 1), (2, 2), (3, 2), (4, 3), (5, 3), (6, 4)]);
-    }
-
 #[test]
 fn line() {
     let mut a = Image::build(5, 5).alloc();
     a.as_mut().line((0, 1), (6, 4), [255]);
     assert_eq!(
             a.buffer,
-            b"\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x00"
+            b"\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00\x00"
         )
 }
-}

src/drawing/poly.rs

@@ -14,7 +14,7 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
     /// # use fimg::Image;
     /// let mut i = Image::alloc(10, 10);
     /// i.points(&[(1, 8), (3, 1), (8, 1), (6, 6), (8, 8), (1, 8)], [255]);
-    /// # assert_eq!(i.buffer(), b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");
+    /// # assert_eq!(i.buffer(), b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");
     /// ```
     pub fn points(&mut self, poly: &[(i32, i32)], c: [u8; CHANNELS]) {
         if poly.len() <= 1 {
@@ -110,7 +110,7 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
         match sides {
             3 => {
                 let space = TAU / 3.0;
-                self.tri(
+                self.tri::<f32>(
                     trans(space + rotation) + pos,
                     trans(rotation) + pos,
                     trans(madd(space, 2.0, rotation)) + pos,
@@ -132,7 +132,7 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
                 if sides % 2 != 0 && sides > 4 {
                     let i = (sides - 1) as f32;
                     // the missing piece
-                    self.tri(
+                    self.tri::<f32>(
                         pos,
                         trans(madd(space, i, rotation)) + pos,
                         trans(madd(space, i + 1., rotation)) + pos,