servo/components/layout_2020/replaced.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use crate::dom_traversal::NodeExt;
use crate::fragments::{Fragment, ImageFragment};
use crate::geom::{flow_relative, physical};
use net_traits::image::base::Image;
use servo_arc::Arc as ServoArc;
use std::sync::Arc;
use style::properties::ComputedValues;
use style::values::computed::Length;

#[derive(Debug)]
pub(crate) struct ReplacedContent {
    pub kind: ReplacedContentKind,
    pub intrinsic_size: physical::Vec2<Length>,
}

#[derive(Debug)]
pub(crate) enum ReplacedContentKind {
    Image(Option<Arc<Image>>),
}

impl ReplacedContent {
    pub fn for_element<'dom>(element: impl NodeExt<'dom>) -> Option<Self> {
        if let Some((image, intrinsic_size)) = element.as_image() {
            return Some(Self {
                kind: ReplacedContentKind::Image(image),
                intrinsic_size,
            });
        }
        None
    }

    pub fn make_fragments<'a>(
        &'a self,
        style: &ServoArc<ComputedValues>,
        size: flow_relative::Vec2<Length>,
    ) -> Vec<Fragment> {
        match &self.kind {
            ReplacedContentKind::Image(image) => image
                .as_ref()
                .and_then(|image| image.id)
                .map(|image_key| {
                    Fragment::Image(ImageFragment {
                        style: style.clone(),
                        content_rect: flow_relative::Rect {
                            start_corner: flow_relative::Vec2::zero(),
                            size,
                        },
                        image_key,
                    })
                })
                .into_iter()
                .collect(),
        }
    }
}