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/* 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 std::marker::PhantomData;
use std::sync::{Arc, Mutex};
use atomic_refcell::{AtomicRefCell, AtomicRefMut};
use msg::constellation_msg::{BrowsingContextId, PipelineId};
use net_traits::image::base::Image as NetImage;
use script_layout_interface::wrapper_traits::{LayoutDataTrait, LayoutNode, ThreadSafeLayoutNode};
use script_layout_interface::{HTMLCanvasDataSource, StyleData};
use servo_arc::Arc as ServoArc;
use style::properties::ComputedValues;
use crate::cell::ArcRefCell;
use crate::context::LayoutContext;
use crate::dom_traversal::WhichPseudoElement;
use crate::flexbox::FlexLevelBox;
use crate::flow::inline::InlineLevelBox;
use crate::flow::BlockLevelBox;
use crate::geom::PhysicalSize;
use crate::replaced::{CanvasInfo, CanvasSource};
/// The data that is stored in each DOM node that is used by layout.
#[derive(Default)]
pub struct DOMLayoutData {
pub(super) self_box: ArcRefCell<Option<LayoutBox>>,
pub(super) pseudo_before_box: ArcRefCell<Option<LayoutBox>>,
pub(super) pseudo_after_box: ArcRefCell<Option<LayoutBox>>,
}
/// A box that is stored in one of the `DOMLayoutData` slots.
pub(super) enum LayoutBox {
DisplayContents,
BlockLevel(ArcRefCell<BlockLevelBox>),
InlineLevel(ArcRefCell<InlineLevelBox>),
FlexLevel(ArcRefCell<FlexLevelBox>),
}
// The implementation of this trait allows the data to be stored in the DOM.
impl LayoutDataTrait for DOMLayoutData {}
pub struct StyleAndLayoutData<'dom> {
pub style_data: &'dom StyleData,
pub(super) layout_data: &'dom AtomicRefCell<DOMLayoutData>,
}
pub struct BoxSlot<'dom> {
pub(crate) slot: Option<ArcRefCell<Option<LayoutBox>>>,
pub(crate) marker: PhantomData<&'dom ()>,
}
/// A mutable reference to a `LayoutBox` stored in a DOM element.
impl BoxSlot<'_> {
pub(crate) fn new(slot: ArcRefCell<Option<LayoutBox>>) -> Self {
*slot.borrow_mut() = None;
let slot = Some(slot);
Self {
slot,
marker: PhantomData,
}
}
pub(crate) fn dummy() -> Self {
let slot = None;
Self {
slot,
marker: PhantomData,
}
}
pub(crate) fn set(mut self, box_: LayoutBox) {
if let Some(slot) = &mut self.slot {
*slot.borrow_mut() = Some(box_);
}
}
}
impl Drop for BoxSlot<'_> {
fn drop(&mut self) {
if !std::thread::panicking() {
if let Some(slot) = &mut self.slot {
assert!(slot.borrow().is_some(), "failed to set a layout box");
}
}
}
}
pub(crate) trait NodeExt<'dom>: 'dom + LayoutNode<'dom> {
/// Returns the image if it’s loaded, and its size in image pixels
/// adjusted for `image_density`.
fn as_image(self) -> Option<(Option<Arc<NetImage>>, PhysicalSize<f64>)>;
fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)>;
fn as_iframe(self) -> Option<(PipelineId, BrowsingContextId)>;
fn style(self, context: &LayoutContext) -> ServoArc<ComputedValues>;
fn get_style_and_layout_data(self) -> Option<StyleAndLayoutData<'dom>>;
fn layout_data_mut(self) -> AtomicRefMut<'dom, DOMLayoutData>;
fn element_box_slot(&self) -> BoxSlot<'dom>;
fn pseudo_element_box_slot(&self, which: WhichPseudoElement) -> BoxSlot<'dom>;
fn unset_pseudo_element_box(self, which: WhichPseudoElement);
/// Remove boxes for the element itself, and its `:before` and `:after` if any.
fn unset_all_boxes(self);
}
impl<'dom, LayoutNodeType> NodeExt<'dom> for LayoutNodeType
where
LayoutNodeType: 'dom + LayoutNode<'dom>,
{
fn as_image(self) -> Option<(Option<Arc<NetImage>>, PhysicalSize<f64>)> {
let node = self.to_threadsafe();
let (resource, metadata) = node.image_data()?;
let (width, height) = resource
.as_ref()
.map(|image| (image.width, image.height))
.or_else(|| metadata.map(|metadata| (metadata.width, metadata.height)))
.unwrap_or((0, 0));
let (mut width, mut height) = (width as f64, height as f64);
if let Some(density) = node.image_density().filter(|density| *density != 1.) {
width /= density;
height /= density;
}
Some((resource, PhysicalSize::new(width, height)))
}
fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)> {
let node = self.to_threadsafe();
let canvas_data = node.canvas_data()?;
let source = match canvas_data.source {
HTMLCanvasDataSource::WebGL(texture_id) => CanvasSource::WebGL(texture_id),
HTMLCanvasDataSource::Image(ipc_sender) => {
CanvasSource::Image(ipc_sender.map(|renderer| Arc::new(Mutex::new(renderer))))
},
HTMLCanvasDataSource::WebGPU(image_key) => CanvasSource::WebGPU(image_key),
};
Some((
CanvasInfo {
source,
canvas_id: canvas_data.canvas_id,
},
PhysicalSize::new(canvas_data.width.into(), canvas_data.height.into()),
))
}
fn as_iframe(self) -> Option<(PipelineId, BrowsingContextId)> {
let node = self.to_threadsafe();
match (node.iframe_pipeline_id(), node.iframe_browsing_context_id()) {
(Some(pipeline_id), Some(browsing_context_id)) => {
Some((pipeline_id, browsing_context_id))
},
_ => None,
}
}
fn style(self, context: &LayoutContext) -> ServoArc<ComputedValues> {
self.to_threadsafe().style(context.shared_context())
}
fn layout_data_mut(self) -> AtomicRefMut<'dom, DOMLayoutData> {
self.get_style_and_layout_data()
.map(|d| d.layout_data.borrow_mut())
.unwrap()
}
fn element_box_slot(&self) -> BoxSlot<'dom> {
BoxSlot::new(self.layout_data_mut().self_box.clone())
}
fn pseudo_element_box_slot(&self, which: WhichPseudoElement) -> BoxSlot<'dom> {
let data = self.layout_data_mut();
let cell = match which {
WhichPseudoElement::Before => &data.pseudo_before_box,
WhichPseudoElement::After => &data.pseudo_after_box,
};
BoxSlot::new(cell.clone())
}
fn unset_pseudo_element_box(self, which: WhichPseudoElement) {
let data = self.layout_data_mut();
let cell = match which {
WhichPseudoElement::Before => &data.pseudo_before_box,
WhichPseudoElement::After => &data.pseudo_after_box,
};
*cell.borrow_mut() = None;
}
fn unset_all_boxes(self) {
let data = self.layout_data_mut();
*data.self_box.borrow_mut() = None;
*data.pseudo_before_box.borrow_mut() = None;
*data.pseudo_after_box.borrow_mut() = None;
// Stylo already takes care of removing all layout data
// for DOM descendants of elements with `display: none`.
}
fn get_style_and_layout_data(self) -> Option<StyleAndLayoutData<'dom>> {
self.get_style_and_opaque_layout_data()
.map(|data| StyleAndLayoutData {
style_data: &data.style_data,
layout_data: data.generic_data.downcast_ref().unwrap(),
})
}
}
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