rust/land2d/src/lib.rs
author alfadur
Tue, 06 Nov 2018 23:29:12 +0300
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child 14149 8e2e98760003
permissions -rw-r--r--
seems like about 25% speedup in land filling
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extern crate integral_geometry;
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extern crate vec2d;
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use std::{
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    cmp,
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    ops::Index
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};
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use integral_geometry::{ArcPoints, EquidistantPoints, Line, Point, Rect, Size, SizeMask};
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pub struct Land2D<T> {
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    pixels: vec2d::Vec2D<T>,
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    play_box: Rect,
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    mask: SizeMask,
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}
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impl<T: Copy + PartialEq> Land2D<T> {
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    pub fn new(play_size: Size, fill_value: T) -> Self {
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        let real_size = play_size.next_power_of_two();
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        let top_left = Point::new(
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            ((real_size.width - play_size.width) / 2) as i32,
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            (real_size.height - play_size.height) as i32,
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        );
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        let play_box = Rect::from_size(top_left, play_size);
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        Self {
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            play_box,
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            pixels: vec2d::Vec2D::new(real_size, fill_value),
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            mask: real_size.to_mask(),
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        }
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    }
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    pub fn raw_pixels(&self) -> &[T] {
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        &self.pixels.raw_data()
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    }
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    #[inline]
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    pub fn width(&self) -> usize {
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        self.pixels.width()
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    }
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    #[inline]
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    pub fn height(&self) -> usize {
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        self.pixels.height()
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    }
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    #[inline]
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    pub fn size(&self) -> Size {
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        self.pixels.size()
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    }
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    #[inline]
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    pub fn play_width(&self) -> usize {
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        self.play_box.width()
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    }
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    #[inline]
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    pub fn play_height(&self) -> usize {
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        self.play_box.height()
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    }
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    #[inline]
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    pub fn play_size(&self) -> Size {
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        self.play_box.size()
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    }
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    #[inline]
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    pub fn play_box(&self) -> Rect {
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        self.play_box
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    }
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    #[inline]
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    pub fn is_valid_x(&self, x: i32) -> bool {
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        self.mask.contains_x(x as usize)
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    }
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    #[inline]
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    pub fn is_valid_y(&self, y: i32) -> bool {
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        self.mask.contains_y(y as usize)
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    }
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    #[inline]
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    pub fn is_valid_coordinate(&self, x: i32, y: i32) -> bool {
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        self.is_valid_x(x) && self.is_valid_y(y)
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    }
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    #[inline]
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    pub fn rows(&self) -> impl Iterator<Item = &[T]> {
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        self.pixels.rows()
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    }
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    #[inline]
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    pub fn map<U: Default, F: FnOnce(&mut T) -> U>(&mut self, y: i32, x: i32, f: F) -> U {
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        if self.is_valid_coordinate(x, y) {
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            unsafe {
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                // hey, I just checked that coordinates are valid!
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                f(self.pixels.get_unchecked_mut(y as usize, x as usize))
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            }
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        } else {
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            U::default()
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        }
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    }
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    #[inline]
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    pub fn map_point<U: Default, F: FnOnce(&mut T) -> U>(&mut self, point: Point, f: F) -> U {
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        self.map(point.y, point.x, f)
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    }
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    pub fn fill_from_iter<I>(&mut self, i: I, value: T) -> usize
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    where
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        I: std::iter::Iterator<Item = Point>,
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    {
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        i.map(|p| {
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            self.map(p.y, p.x, |v| {
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                *v = value;
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                1
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            })
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        }).count()
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    }
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    pub fn draw_line(&mut self, line: Line, value: T) -> usize {
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        self.fill_from_iter(line.into_iter(), value)
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    }
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    pub fn fill(&mut self, start_point: Point, border_value: T, fill_value: T) {
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        debug_assert!(self.is_valid_coordinate(start_point.x - 1, start_point.y));
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        debug_assert!(self.is_valid_coordinate(start_point.x, start_point.y));
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        let mask = self.mask;
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        let width = self.width();
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        let mut stack: Vec<(usize, usize, usize, isize)> = Vec::new();
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        fn push(
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            mask: SizeMask,
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            stack: &mut Vec<(usize, usize, usize, isize)>,
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            xl: usize,
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            xr: usize,
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            y: usize,
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            dir: isize,
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        ) {
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            let yd = y as isize + dir;
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            if mask.contains_y(yd as usize) {
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                stack.push((xl, xr, yd as usize, dir));
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            }
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        };
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        let start_x_l = (start_point.x - 1) as usize;
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        let start_x_r = start_point.x as usize;
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        for dir in [-1, 1].iter().cloned() {
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            push(mask, &mut stack, start_x_l, start_x_r, start_point.y as usize, dir);
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        }
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        while let Some((mut xl, mut xr, y, dir)) = stack.pop() {
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            let row = &mut self.pixels[y][..];
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            while xl > 0 && row.get(xl)
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                .map_or(false, |v| *v != border_value && *v != fill_value)
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            {
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                xl -= 1;
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            }
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            while xr < width - 1 && row.get(xr)
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                .map_or(false, |v| *v != border_value && *v != fill_value)
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            {
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                xr += 1;
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            }
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            while xl < xr {
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                while xl <= xr && (row[xl] == border_value || row[xl] == fill_value)
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                {
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                    xl += 1;
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                }
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                let x = xl;
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                while xl <= xr && (row[xl] != border_value && row[xl] != fill_value)
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                {
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                    row[xl] = fill_value;
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                    xl += 1;
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                }
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                if x < xl {
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                    push(mask, &mut stack, x, xl - 1, y, dir);
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                    push(mask, &mut stack, x, xl - 1, y, -dir);
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                }
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            }
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        }
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    }
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    #[inline]
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    fn fill_circle_line<F: Fn(&mut T) -> usize>(
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        &mut self,
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        y: i32,
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        x_from: i32,
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        x_to: i32,
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        f: &F,
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    ) -> usize {
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        let mut result = 0;
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        if self.is_valid_y(y) {
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            for i in cmp::min(x_from, 0) as usize..cmp::max(x_to as usize, self.width() - 1) {
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                unsafe {
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                    // coordinates are valid at this point
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                    result += f(self.pixels.get_unchecked_mut(y as usize, i));
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                }
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            }
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        }
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        result
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    }
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    #[inline]
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   211
    fn fill_circle_lines<F: Fn(&mut T) -> usize>(
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   212
        &mut self,
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        x: i32,
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        y: i32,
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        dx: i32,
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        dy: i32,
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        f: &F,
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   218
    ) -> usize {
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        self.fill_circle_line(y + dy, x - dx, x + dx, f)
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            + self.fill_circle_line(y - dy, x - dx, x + dx, f)
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   221
            + self.fill_circle_line(y + dx, x - dy, x + dy, f)
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   222
            + self.fill_circle_line(y - dx, x - dy, x + dy, f)
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   223
    }
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   224
9230aed8a32e Implement Land2D::change_round()
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   225
    pub fn change_round<F: Fn(&mut T) -> usize>(
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   226
        &mut self,
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   227
        x: i32,
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        y: i32,
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   229
        radius: i32,
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   230
        f: F,
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   231
    ) -> usize {
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   232
        ArcPoints::new(radius)
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            .map(&mut |p: Point| self.fill_circle_lines(x, y, p.x, p.y, &f))
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   234
            .sum()
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   235
    }
13931
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   236
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   237
    fn fill_row(&mut self, center: Point, offset: Point, value: T) -> usize {
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   238
        let row_index = center.y + offset.y;
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   239
        if self.is_valid_y(row_index) {
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   240
            let from_x = cmp::max(0, center.x - offset.x) as usize;
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            let to_x = cmp::min(self.width() - 1, (center.x + offset.x) as usize);
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            self.pixels[row_index as usize][from_x..=to_x]
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   243
                .iter_mut()
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   244
                .for_each(|v| *v = value);
14031
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   245
            to_x - from_x + 1
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   246
        } else {
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   247
            0
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   248
        }
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   249
    }
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   250
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   251
    pub fn fill_circle(&mut self, center: Point, radius: i32, value: T) -> usize {
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        let transforms = [[0, 1, 1, 0], [0, 1, -1, 0], [1, 0, 0, 1], [1, 0, 0, -1]];
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   253
        ArcPoints::new(radius)
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diff changeset
   254
            .map(|vector| {
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diff changeset
   255
                transforms
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   256
                    .iter()
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   257
                    .map(|m| self.fill_row(center, vector.transform(m), value))
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   258
                    .sum::<usize>()
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   259
            }).sum()
14031
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   260
    }
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   261
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   262
    pub fn draw_thick_line(&mut self, line: Line, radius: i32, value: T) -> usize {
13944
4162ea9ae333 Use integral-geometry iterators to implement Land2D::draw_thick_line, remove no longer unused functions from Land2D
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   263
        let mut result = 0;
13931
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diff changeset
   264
13949
a1895019bb94 change draw_thick_line iteration order to benchmark winner
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   265
        for vector in ArcPoints::new(radius) {
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diff changeset
   266
            for delta in EquidistantPoints::new(vector) {
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   267
                for point in line.into_iter() {
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   268
                    self.map_point(point + delta, |p| {
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   269
                        if *p != value {
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   270
                            *p = value;
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   271
                            result += 1;
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   272
                        }
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   273
                    })
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   274
                }
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   275
            }
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   276
        }
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   277
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   278
        result
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   279
    }
13917
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   280
}
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   281
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   282
impl<T> Index<usize> for Land2D<T> {
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   283
    type Output = [T];
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   284
    #[inline]
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   285
    fn index(&self, row: usize) -> &[T] {
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   286
        &self.pixels[row]
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   287
    }
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   288
}
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   289
13917
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   290
#[cfg(test)]
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diff changeset
   291
mod tests {
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   292
    use super::*;
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   293
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   294
    #[test]
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   295
    fn basics() {
14052
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diff changeset
   296
        let l: Land2D<u8> = Land2D::new(Size::new(30, 50), 0);
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diff changeset
   297
4b40bdd214df Use next_power_of_two() just like hedgewars engine does, expose original and real dimensions
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   298
        assert_eq!(l.play_width(), 30);
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diff changeset
   299
        assert_eq!(l.play_height(), 50);
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diff changeset
   300
        assert_eq!(l.width(), 32);
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diff changeset
   301
        assert_eq!(l.height(), 64);
13917
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diff changeset
   302
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   303
        assert!(l.is_valid_coordinate(0, 0));
a83ba9ba1566 Start land2d library implementation: draw_line() method
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parents:
diff changeset
   304
        assert!(!l.is_valid_coordinate(-1, -1));
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   305
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   306
        assert!(l.is_valid_coordinate(31, 63));
a83ba9ba1566 Start land2d library implementation: draw_line() method
unc0rr
parents:
diff changeset
   307
        assert!(!l.is_valid_coordinate(32, 63));
a83ba9ba1566 Start land2d library implementation: draw_line() method
unc0rr
parents:
diff changeset
   308
        assert!(!l.is_valid_coordinate(31, 64));
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diff changeset
   309
    }
a83ba9ba1566 Start land2d library implementation: draw_line() method
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diff changeset
   310
13924
a140f28decc4 Implement Land2D::fill() + tests
unc0rr
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diff changeset
   311
    #[test]
a140f28decc4 Implement Land2D::fill() + tests
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   312
    fn fill() {
14032
2869c2ccb1b8 extract size struct for common usage
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diff changeset
   313
        let mut l: Land2D<u8> = Land2D::new(Size::square(128), 0);
13924
a140f28decc4 Implement Land2D::fill() + tests
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diff changeset
   314
14076
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diff changeset
   315
        l.draw_line(Line::new(Point::new(0, 0), Point::new(32, 96)), 1);
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diff changeset
   316
        l.draw_line(Line::new(Point::new(32, 96), Point::new(64, 32)), 1);
e5904ead4864 Introduce OutlineSegmentsIterator, some refactoring
unC0Rr
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diff changeset
   317
        l.draw_line(Line::new(Point::new(64, 32), Point::new(96, 80)), 1);
e5904ead4864 Introduce OutlineSegmentsIterator, some refactoring
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        l.draw_line(Line::new(Point::new(96, 80), Point::new(128, 0)), 1);
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        l.draw_line(Line::new(Point::new(0, 128), Point::new(64, 96)), 1);
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        l.draw_line(Line::new(Point::new(128, 128), Point::new(64, 96)), 1);
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        l.fill(Point::new(32, 32), 1, 2);
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        l.fill(Point::new(16, 96), 1, 3);
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        l.fill(Point::new(60, 100), 1, 4);
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        assert_eq!(l.pixels[0][0], 1);
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        assert_eq!(l.pixels[96][64], 1);
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        assert_eq!(l.pixels[40][32], 2);
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        assert_eq!(l.pixels[40][96], 2);
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        assert_eq!(l.pixels[5][0], 3);
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        assert_eq!(l.pixels[120][0], 3);
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        assert_eq!(l.pixels[5][127], 3);
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        assert_eq!(l.pixels[120][127], 3);
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        assert_eq!(l.pixels[35][64], 3);
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        assert_eq!(l.pixels[120][20], 4);
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        assert_eq!(l.pixels[120][100], 4);
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        assert_eq!(l.pixels[100][64], 4);
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    }
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}