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use clipline crate

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bendn 2023-11-01 10:21:24 +07:00
parent c02376b96b
commit 1e98d959db
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7 changed files with 29 additions and 167 deletions
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1
Cargo.toml
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@ -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" }

10
benches/drawing.rs
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@ -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);

4
src/convert.rs
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@ -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,

175
src/drawing/line.rs
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@ -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)) {
if x < self.width() && y < self.height() {
// SAFETY: bound are checked ^
unsafe { self.set_pixel(x, y, color) };
}
}
clipline::clipline(
((a.0 as isize, a.1 as isize), (b.0 as isize, b.1 as isize)),
(
(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!(
#[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"
)
}
}

6
src/drawing/poly.rs
View file

@ -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,

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tdata/border_pentagon.imgbuf
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tdata/enneagon.imgbuf
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