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https://github.com/servo/servo.git
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de780dcde4
Push the interior mutability into enum variants of `Fragment`, so that they can be cloned. This saves memory in the `Fragment` tree as the `Fragment` enum is now a relatively wee 16 bytes and the interior parts can be a variety of sizes. Before, every `Fragment` was the size of the biggest kind (`BoxFragment` - 248 bytes). This a step on the way toward incremental layout. Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Oriol Brufau <obrufau@igalia.com>
81 lines
2.6 KiB
Rust
81 lines
2.6 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 app_units::Au;
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use base::print_tree::PrintTree;
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use serde::Serialize;
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use servo_arc::Arc as ServoArc;
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use style::properties::ComputedValues;
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use super::{BaseFragment, BaseFragmentInfo, Fragment};
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use crate::cell::ArcRefCell;
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use crate::geom::PhysicalRect;
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/// Can contain child fragments with relative coordinates, but does not contribute to painting
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/// itself. [`PositioningFragment`]s may be completely anonymous, or just non-painting Fragments
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/// generated by boxes.
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#[derive(Serialize)]
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pub(crate) struct PositioningFragment {
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pub base: BaseFragment,
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pub rect: PhysicalRect<Au>,
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pub children: Vec<Fragment>,
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/// The scrollable overflow of this anonymous fragment's children.
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pub scrollable_overflow: PhysicalRect<Au>,
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/// If this fragment was created with a style, the style of the fragment.
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#[serde(skip_serializing)]
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pub style: Option<ServoArc<ComputedValues>>,
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}
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impl PositioningFragment {
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pub fn new_anonymous(rect: PhysicalRect<Au>, children: Vec<Fragment>) -> ArcRefCell<Self> {
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Self::new_with_base_fragment(BaseFragment::anonymous(), None, rect, children)
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}
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pub fn new_empty(
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base_fragment_info: BaseFragmentInfo,
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rect: PhysicalRect<Au>,
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style: ServoArc<ComputedValues>,
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) -> ArcRefCell<Self> {
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Self::new_with_base_fragment(base_fragment_info.into(), Some(style), rect, Vec::new())
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}
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fn new_with_base_fragment(
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base: BaseFragment,
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style: Option<ServoArc<ComputedValues>>,
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rect: PhysicalRect<Au>,
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children: Vec<Fragment>,
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) -> ArcRefCell<Self> {
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let content_origin = rect.origin;
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let scrollable_overflow = children.iter().fold(PhysicalRect::zero(), |acc, child| {
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acc.union(
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&child
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.scrollable_overflow()
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.translate(content_origin.to_vector()),
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)
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});
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ArcRefCell::new(PositioningFragment {
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base,
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style,
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rect,
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children,
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scrollable_overflow,
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})
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}
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pub fn print(&self, tree: &mut PrintTree) {
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tree.new_level(format!(
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"PositioningFragment\
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\nbase={:?}\
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\nrect={:?}\
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\nscrollable_overflow={:?}",
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self.base, self.rect, self.scrollable_overflow
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));
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for child in &self.children {
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child.print(tree);
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}
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tree.end_level();
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}
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}
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