tawasuyu/taffy

1//! Generic CSS content size code that is shared between all CSS algorithms.
2use crate::geometry::{Point, Size};
3use crate::style::Overflow;
4use crate::util::sys::{f32_max, f32_min};
5
6#[inline(always)]
7/// Determine how much width/height a given node contributes to it's parent's content size
8pub(crate) fn compute_content_size_contribution(
9    location: Point<f32>,
10    size: Size<f32>,
11    content_size: Size<f32>,
12    overflow: Point<Overflow>,
13) -> Size<f32> {
14    let size_content_size_contribution = Size {
15        width: match overflow.x {
16            Overflow::Visible => f32_max(size.width, content_size.width),
17            _ => size.width,
18        },
19        height: match overflow.y {
20            Overflow::Visible => f32_max(size.height, content_size.height),
21            _ => size.height,
22        },
23    };
24    if size_content_size_contribution.width > 0.0 && size_content_size_contribution.height > 0.0 {
25        let max_x = f32_max(location.x + size_content_size_contribution.width, 0.0);
26        let min_x = f32_min(location.x, 0.0);
27        let max_y = f32_max(location.y + size_content_size_contribution.height, 0.0);
28        let min_y = f32_min(location.y, 0.0);
29
30        Size { width: max_x - min_x, height: max_y - min_y }
31    } else {
32        Size::ZERO
33    }
34}