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e74075255b
This accomplishes two things: 1. Makes it easier to iterate through all inline formatting context items. 2. Will make it possible to easily move back and forth through the tree of inline boxes, in order to enable reordering and splitting inline boxes on lines -- necessary for BiDi. Co-authored-by: Rakhi Sharma <atbrakhi@igalia.com>
244 lines
8.8 KiB
Rust
244 lines
8.8 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::marker::PhantomData;
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use std::sync::{Arc, Mutex};
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use atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
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use base::id::{BrowsingContextId, PipelineId};
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use html5ever::{local_name, namespace_url, ns};
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use pixels::Image;
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use script_layout_interface::wrapper_traits::{
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LayoutDataTrait, LayoutNode, ThreadSafeLayoutElement, ThreadSafeLayoutNode,
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};
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use script_layout_interface::{
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HTMLCanvasDataSource, LayoutElementType, LayoutNodeType as ScriptLayoutNodeType,
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};
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use servo_arc::Arc as ServoArc;
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use style::properties::ComputedValues;
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use crate::cell::ArcRefCell;
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use crate::context::LayoutContext;
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use crate::dom_traversal::WhichPseudoElement;
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use crate::flexbox::FlexLevelBox;
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use crate::flow::inline::{InlineBox, InlineItem};
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use crate::flow::BlockLevelBox;
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use crate::geom::PhysicalSize;
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use crate::replaced::{CanvasInfo, CanvasSource};
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/// The data that is stored in each DOM node that is used by layout.
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#[derive(Default)]
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pub struct InnerDOMLayoutData {
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pub(super) self_box: ArcRefCell<Option<LayoutBox>>,
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pub(super) pseudo_before_box: ArcRefCell<Option<LayoutBox>>,
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pub(super) pseudo_after_box: ArcRefCell<Option<LayoutBox>>,
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}
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/// A box that is stored in one of the `DOMLayoutData` slots.
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pub(super) enum LayoutBox {
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DisplayContents,
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BlockLevel(ArcRefCell<BlockLevelBox>),
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#[allow(dead_code)]
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InlineBox(ArcRefCell<InlineBox>),
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InlineLevel(ArcRefCell<InlineItem>),
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FlexLevel(ArcRefCell<FlexLevelBox>),
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}
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/// A wrapper for [`InnerDOMLayoutData`]. This is necessary to give the entire data
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/// structure interior mutability, as we will need to mutate the layout data of
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/// non-mutable DOM nodes.
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#[derive(Default)]
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pub struct DOMLayoutData(AtomicRefCell<InnerDOMLayoutData>);
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// The implementation of this trait allows the data to be stored in the DOM.
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impl LayoutDataTrait for DOMLayoutData {}
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pub struct BoxSlot<'dom> {
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pub(crate) slot: Option<ArcRefCell<Option<LayoutBox>>>,
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pub(crate) marker: PhantomData<&'dom ()>,
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}
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/// A mutable reference to a `LayoutBox` stored in a DOM element.
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impl BoxSlot<'_> {
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pub(crate) fn new(slot: ArcRefCell<Option<LayoutBox>>) -> Self {
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*slot.borrow_mut() = None;
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let slot = Some(slot);
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Self {
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slot,
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marker: PhantomData,
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}
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}
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pub(crate) fn dummy() -> Self {
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let slot = None;
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Self {
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slot,
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marker: PhantomData,
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}
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}
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pub(crate) fn set(mut self, box_: LayoutBox) {
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if let Some(slot) = &mut self.slot {
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*slot.borrow_mut() = Some(box_);
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}
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}
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}
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impl Drop for BoxSlot<'_> {
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fn drop(&mut self) {
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if !std::thread::panicking() {
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if let Some(slot) = &mut self.slot {
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assert!(slot.borrow().is_some(), "failed to set a layout box");
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}
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}
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}
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}
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pub(crate) trait NodeExt<'dom>: 'dom + LayoutNode<'dom> {
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/// Returns the image if it’s loaded, and its size in image pixels
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/// adjusted for `image_density`.
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fn as_image(self) -> Option<(Option<Arc<Image>>, PhysicalSize<f64>)>;
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fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)>;
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fn as_iframe(self) -> Option<(PipelineId, BrowsingContextId)>;
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fn as_video(self) -> Option<(webrender_api::ImageKey, PhysicalSize<f64>)>;
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fn as_typeless_object_with_data_attribute(self) -> Option<String>;
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fn style(self, context: &LayoutContext) -> ServoArc<ComputedValues>;
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fn layout_data_mut(self) -> AtomicRefMut<'dom, InnerDOMLayoutData>;
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fn layout_data(self) -> Option<AtomicRef<'dom, InnerDOMLayoutData>>;
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fn element_box_slot(&self) -> BoxSlot<'dom>;
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fn pseudo_element_box_slot(&self, which: WhichPseudoElement) -> BoxSlot<'dom>;
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fn unset_pseudo_element_box(self, which: WhichPseudoElement);
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/// Remove boxes for the element itself, and its `:before` and `:after` if any.
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fn unset_all_boxes(self);
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}
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impl<'dom, LayoutNodeType> NodeExt<'dom> for LayoutNodeType
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where
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LayoutNodeType: 'dom + LayoutNode<'dom>,
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{
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fn as_image(self) -> Option<(Option<Arc<Image>>, PhysicalSize<f64>)> {
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let node = self.to_threadsafe();
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let (resource, metadata) = node.image_data()?;
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let (width, height) = resource
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.as_ref()
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.map(|image| (image.width, image.height))
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.or_else(|| metadata.map(|metadata| (metadata.width, metadata.height)))
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.unwrap_or((0, 0));
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let (mut width, mut height) = (width as f64, height as f64);
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if let Some(density) = node.image_density().filter(|density| *density != 1.) {
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width /= density;
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height /= density;
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}
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Some((resource, PhysicalSize::new(width, height)))
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}
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fn as_video(self) -> Option<(webrender_api::ImageKey, PhysicalSize<f64>)> {
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let node = self.to_threadsafe();
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let frame_data = node.media_data()?.current_frame?;
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let (width, height) = (frame_data.1 as f64, frame_data.2 as f64);
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Some((frame_data.0, PhysicalSize::new(width, height)))
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}
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fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)> {
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let node = self.to_threadsafe();
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let canvas_data = node.canvas_data()?;
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let source = match canvas_data.source {
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HTMLCanvasDataSource::WebGL(texture_id) => CanvasSource::WebGL(texture_id),
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HTMLCanvasDataSource::Image(ipc_sender) => {
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CanvasSource::Image(ipc_sender.map(|renderer| Arc::new(Mutex::new(renderer))))
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},
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HTMLCanvasDataSource::WebGPU(image_key) => CanvasSource::WebGPU(image_key),
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};
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Some((
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CanvasInfo {
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source,
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canvas_id: canvas_data.canvas_id,
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},
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PhysicalSize::new(canvas_data.width.into(), canvas_data.height.into()),
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))
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}
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fn as_iframe(self) -> Option<(PipelineId, BrowsingContextId)> {
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let node = self.to_threadsafe();
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match (node.iframe_pipeline_id(), node.iframe_browsing_context_id()) {
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(Some(pipeline_id), Some(browsing_context_id)) => {
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Some((pipeline_id, browsing_context_id))
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},
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_ => None,
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}
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}
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fn as_typeless_object_with_data_attribute(self) -> Option<String> {
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if self.type_id() != ScriptLayoutNodeType::Element(LayoutElementType::HTMLObjectElement) {
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return None;
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}
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let Some(element) = self.to_threadsafe().as_element() else {
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return None;
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};
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// TODO: This is the what the legacy layout system does, but really if Servo
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// supports any `<object>` that's an image, it should support those with URLs
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// and `type` attributes with image mime types.
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if element.get_attr(&ns!(), &local_name!("type")).is_some() {
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return None;
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}
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element
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.get_attr(&ns!(), &local_name!("data"))
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.map(|string| string.to_owned())
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}
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fn style(self, context: &LayoutContext) -> ServoArc<ComputedValues> {
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self.to_threadsafe().style(context.shared_context())
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}
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fn layout_data_mut(self) -> AtomicRefMut<'dom, InnerDOMLayoutData> {
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if LayoutNode::layout_data(&self).is_none() {
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self.initialize_layout_data::<DOMLayoutData>();
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}
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LayoutNode::layout_data(&self)
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.unwrap()
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.downcast_ref::<DOMLayoutData>()
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.unwrap()
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.0
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.borrow_mut()
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}
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fn layout_data(self) -> Option<AtomicRef<'dom, InnerDOMLayoutData>> {
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LayoutNode::layout_data(&self)
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.map(|data| data.downcast_ref::<DOMLayoutData>().unwrap().0.borrow())
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}
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fn element_box_slot(&self) -> BoxSlot<'dom> {
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BoxSlot::new(self.layout_data_mut().self_box.clone())
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}
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fn pseudo_element_box_slot(&self, which: WhichPseudoElement) -> BoxSlot<'dom> {
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let data = self.layout_data_mut();
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let cell = match which {
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WhichPseudoElement::Before => &data.pseudo_before_box,
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WhichPseudoElement::After => &data.pseudo_after_box,
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};
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BoxSlot::new(cell.clone())
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}
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fn unset_pseudo_element_box(self, which: WhichPseudoElement) {
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let data = self.layout_data_mut();
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let cell = match which {
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WhichPseudoElement::Before => &data.pseudo_before_box,
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WhichPseudoElement::After => &data.pseudo_after_box,
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};
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*cell.borrow_mut() = None;
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}
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fn unset_all_boxes(self) {
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let data = self.layout_data_mut();
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*data.self_box.borrow_mut() = None;
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*data.pseudo_before_box.borrow_mut() = None;
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*data.pseudo_after_box.borrow_mut() = None;
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// Stylo already takes care of removing all layout data
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// for DOM descendants of elements with `display: none`.
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}
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}
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