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layout: Combine layout_2020 and layout_thread_2020 into a crate called layout (#36613)
Now that legacy layout has been removed, the name `layout_2020` doesn't make much sense any longer, also it's 2025 now for better or worse. The split between the "layout thread" and "layout" also doesn't make as much sense since layout doesn't run on it's own thread. There's a possibility that it will in the future, but that should be something that the user of the crate controls rather than layout iself. This is part of the larger layout interface cleanup and optimization that @Looriool and I are doing. Testing: Covered by existing tests as this is just code movement. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson
GitHub
parent
3ab5b8c447
commit
7787cab521
62 changed files with 58 additions and 122 deletions
663
components/layout/taffy/layout.rs
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663
components/layout/taffy/layout.rs
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@ -0,0 +1,663 @@
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/* 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 atomic_refcell::{AtomicRef, AtomicRefCell};
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use style::Zero;
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use style::properties::ComputedValues;
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use style::values::specified::align::AlignFlags;
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use style::values::specified::box_::DisplayInside;
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use taffy::style_helpers::{TaffyMaxContent, TaffyMinContent};
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use taffy::{AvailableSpace, MaybeMath, RequestedAxis, RunMode};
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use super::{
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SpecificTaffyGridInfo, TaffyContainer, TaffyItemBox, TaffyItemBoxInner, TaffyStyloStyle,
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};
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use crate::cell::ArcRefCell;
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use crate::context::LayoutContext;
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use crate::formatting_contexts::{
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Baselines, IndependentFormattingContext, IndependentFormattingContextContents,
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};
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use crate::fragment_tree::{
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BoxFragment, CollapsedBlockMargins, Fragment, FragmentFlags, SpecificLayoutInfo,
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};
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use crate::geom::{
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LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSides, PhysicalSize, Size, SizeConstraint,
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Sizes,
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};
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use crate::layout_box_base::CacheableLayoutResult;
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use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
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use crate::sizing::{ComputeInlineContentSizes, ContentSizes, InlineContentSizesResult};
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use crate::style_ext::{ComputedValuesExt, LayoutStyle};
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use crate::{ConstraintSpace, ContainingBlock, ContainingBlockSize};
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const DUMMY_NODE_ID: taffy::NodeId = taffy::NodeId::new(u64::MAX);
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fn resolve_content_size(constraint: AvailableSpace, content_sizes: ContentSizes) -> f32 {
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match constraint {
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AvailableSpace::Definite(limit) => {
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let min = content_sizes.min_content.to_f32_px();
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let max = content_sizes.max_content.to_f32_px();
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limit.min(max).max(min)
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},
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AvailableSpace::MinContent => content_sizes.min_content.to_f32_px(),
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AvailableSpace::MaxContent => content_sizes.max_content.to_f32_px(),
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}
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}
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#[inline(always)]
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fn with_independant_formatting_context<T>(
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item: &mut TaffyItemBoxInner,
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cb: impl FnOnce(&IndependentFormattingContext) -> T,
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) -> T {
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match item {
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TaffyItemBoxInner::InFlowBox(context) => cb(context),
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TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(abspos_box) => {
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cb(&AtomicRefCell::borrow(abspos_box).context)
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},
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}
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}
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/// Layout parameters and intermediate results about a taffy container,
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/// grouped to avoid passing around many parameters
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struct TaffyContainerContext<'a> {
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source_child_nodes: &'a [ArcRefCell<TaffyItemBox>],
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layout_context: &'a LayoutContext<'a>,
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positioning_context: &'a mut PositioningContext,
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content_box_size_override: &'a ContainingBlock<'a>,
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style: &'a ComputedValues,
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specific_layout_info: Option<SpecificLayoutInfo>,
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/// Temporary location for children specific info, which will be moved into child fragments
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child_specific_layout_infos: Vec<Option<SpecificLayoutInfo>>,
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}
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struct ChildIter(std::ops::Range<usize>);
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impl Iterator for ChildIter {
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type Item = taffy::NodeId;
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fn next(&mut self) -> Option<Self::Item> {
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self.0.next().map(taffy::NodeId::from)
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}
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}
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impl taffy::TraversePartialTree for TaffyContainerContext<'_> {
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type ChildIter<'a>
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= ChildIter
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where
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Self: 'a;
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fn child_ids(&self, _node_id: taffy::NodeId) -> Self::ChildIter<'_> {
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ChildIter(0..self.source_child_nodes.len())
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}
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fn child_count(&self, _node_id: taffy::NodeId) -> usize {
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self.source_child_nodes.len()
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}
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fn get_child_id(&self, _node_id: taffy::NodeId, index: usize) -> taffy::NodeId {
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taffy::NodeId::from(index)
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}
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}
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impl taffy::LayoutPartialTree for TaffyContainerContext<'_> {
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type CoreContainerStyle<'a>
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= TaffyStyloStyle<&'a ComputedValues>
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where
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Self: 'a;
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fn get_core_container_style(&self, _node_id: taffy::NodeId) -> Self::CoreContainerStyle<'_> {
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TaffyStyloStyle(self.style)
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}
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fn set_unrounded_layout(&mut self, node_id: taffy::NodeId, layout: &taffy::Layout) {
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let id = usize::from(node_id);
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(*self.source_child_nodes[id]).borrow_mut().taffy_layout = *layout;
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}
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fn compute_child_layout(
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&mut self,
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node_id: taffy::NodeId,
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inputs: taffy::LayoutInput,
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) -> taffy::LayoutOutput {
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let mut child = (*self.source_child_nodes[usize::from(node_id)]).borrow_mut();
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let child = &mut *child;
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fn option_f32_to_size(input: Option<f32>) -> Size<Au> {
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match input {
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None => Size::Initial,
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Some(length) => Size::Numeric(Au::from_f32_px(length)),
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}
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}
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with_independant_formatting_context(
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&mut child.taffy_level_box,
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|independent_context| -> taffy::LayoutOutput {
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// TODO: re-evaluate sizing constraint conversions in light of recent layout changes
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let containing_block = &self.content_box_size_override;
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let style = independent_context.style();
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// Adjust known_dimensions from border box to content box
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let pbm = independent_context
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.layout_style()
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.padding_border_margin(containing_block);
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let pb_sum = pbm.padding_border_sums.map(|v| v.to_f32_px());
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let margin_sum = pbm.margin.auto_is(Au::zero).sum().map(|v| v.to_f32_px());
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let content_box_inset = pb_sum + margin_sum;
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let content_box_known_dimensions = taffy::Size {
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width: inputs
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.known_dimensions
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.width
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.map(|width| width - pb_sum.inline),
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height: inputs
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.known_dimensions
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.height
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.map(|height| height - pb_sum.block),
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};
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match &independent_context.contents {
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IndependentFormattingContextContents::Replaced(replaced) => {
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let content_box_size = replaced
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.used_size_as_if_inline_element_from_content_box_sizes(
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containing_block,
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style,
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independent_context
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.preferred_aspect_ratio(&pbm.padding_border_sums),
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LogicalVec2 {
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block: &Sizes::new(
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option_f32_to_size(content_box_known_dimensions.height),
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Size::Initial,
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Size::Initial,
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),
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inline: &Sizes::new(
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option_f32_to_size(content_box_known_dimensions.width),
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Size::Initial,
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Size::Initial,
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),
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},
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Size::FitContent.into(),
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pbm.padding_border_sums + pbm.margin.auto_is(Au::zero).sum(),
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)
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.to_physical_size(self.style.writing_mode);
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// Create fragments if the RunMode if PerformLayout
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// If the RunMode is ComputeSize then only the returned size will be used
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if inputs.run_mode == RunMode::PerformLayout {
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child.child_fragments = replaced.make_fragments(
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self.layout_context,
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style,
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content_box_size,
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);
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}
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let computed_size = taffy::Size {
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width: inputs.known_dimensions.width.unwrap_or_else(|| {
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content_box_size.width.to_f32_px() + pb_sum.inline
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}),
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height: inputs.known_dimensions.height.unwrap_or_else(|| {
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content_box_size.height.to_f32_px() + pb_sum.block
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}),
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};
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let size = inputs.known_dimensions.unwrap_or(computed_size);
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taffy::LayoutOutput {
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size,
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..taffy::LayoutOutput::DEFAULT
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}
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},
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IndependentFormattingContextContents::NonReplaced(non_replaced) => {
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// Compute inline size
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let inline_size = content_box_known_dimensions.width.unwrap_or_else(|| {
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let constraint_space = ConstraintSpace {
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// TODO: pass min- and max- size
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block_size: SizeConstraint::new(
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inputs.parent_size.height.map(Au::from_f32_px),
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Au::zero(),
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None,
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),
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writing_mode: self.style.writing_mode,
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preferred_aspect_ratio: non_replaced.preferred_aspect_ratio(),
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};
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let result = independent_context
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.inline_content_sizes(self.layout_context, &constraint_space);
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let adjusted_available_space = inputs
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.available_space
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.width
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.map_definite_value(|width| width - content_box_inset.inline);
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resolve_content_size(adjusted_available_space, result.sizes)
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});
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// Return early if only inline content sizes are requested
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if inputs.run_mode == RunMode::ComputeSize &&
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inputs.axis == RequestedAxis::Horizontal
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{
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return taffy::LayoutOutput::from_outer_size(taffy::Size {
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width: inline_size + pb_sum.inline,
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// If RequestedAxis is Horizontal then height will be ignored.
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height: 0.0,
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});
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}
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let content_box_size_override = ContainingBlock {
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size: ContainingBlockSize {
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inline: Au::from_f32_px(inline_size),
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block: content_box_known_dimensions
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.height
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.map(Au::from_f32_px)
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.map_or_else(SizeConstraint::default, SizeConstraint::Definite),
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},
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style,
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};
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let layout = {
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let mut child_positioning_context =
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PositioningContext::new_for_style(style).unwrap_or_else(|| {
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PositioningContext::new_for_subtree(
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self.positioning_context
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.collects_for_nearest_positioned_ancestor(),
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)
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});
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let layout = non_replaced.layout_without_caching(
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self.layout_context,
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&mut child_positioning_context,
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&content_box_size_override,
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containing_block,
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false, /* depends_on_block_constraints */
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);
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// Store layout data on child for later access
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child.positioning_context = child_positioning_context;
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layout
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};
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child.child_fragments = layout.fragments;
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self.child_specific_layout_infos[usize::from(node_id)] =
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layout.specific_layout_info;
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let block_size = layout.content_block_size.to_f32_px();
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let computed_size = taffy::Size {
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width: inline_size + pb_sum.inline,
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height: block_size + pb_sum.block,
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};
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let size = inputs.known_dimensions.unwrap_or(computed_size);
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taffy::LayoutOutput {
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size,
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first_baselines: taffy::Point {
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x: None,
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y: layout.baselines.first.map(|au| au.to_f32_px()),
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},
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..taffy::LayoutOutput::DEFAULT
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}
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},
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}
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},
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)
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}
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}
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impl taffy::LayoutGridContainer for TaffyContainerContext<'_> {
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type GridContainerStyle<'a>
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= TaffyStyloStyle<&'a ComputedValues>
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where
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Self: 'a;
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type GridItemStyle<'a>
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= TaffyStyloStyle<AtomicRef<'a, ComputedValues>>
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where
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Self: 'a;
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fn get_grid_container_style(
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&self,
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_node_id: taffy::prelude::NodeId,
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) -> Self::GridContainerStyle<'_> {
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TaffyStyloStyle(self.style)
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}
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fn get_grid_child_style(
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&self,
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child_node_id: taffy::prelude::NodeId,
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) -> Self::GridItemStyle<'_> {
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let id = usize::from(child_node_id);
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let child = (*self.source_child_nodes[id]).borrow();
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TaffyStyloStyle(AtomicRef::map(child, |c| &*c.style))
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}
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fn set_detailed_grid_info(
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&mut self,
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_node_id: taffy::NodeId,
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specific_layout_info: taffy::DetailedGridInfo,
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) {
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self.specific_layout_info = Some(SpecificLayoutInfo::Grid(Box::new(
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SpecificTaffyGridInfo::from_detailed_grid_layout(specific_layout_info),
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)));
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}
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}
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impl ComputeInlineContentSizes for TaffyContainer {
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fn compute_inline_content_sizes(
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&self,
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layout_context: &LayoutContext,
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_constraint_space: &ConstraintSpace,
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) -> InlineContentSizesResult {
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let style = &self.style;
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let max_content_inputs = taffy::LayoutInput {
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run_mode: taffy::RunMode::ComputeSize,
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sizing_mode: taffy::SizingMode::InherentSize,
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axis: taffy::RequestedAxis::Horizontal,
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vertical_margins_are_collapsible: taffy::Line::FALSE,
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known_dimensions: taffy::Size::NONE,
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parent_size: taffy::Size::NONE,
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available_space: taffy::Size::MAX_CONTENT,
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};
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let min_content_inputs = taffy::LayoutInput {
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available_space: taffy::Size::MIN_CONTENT,
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..max_content_inputs
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};
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let containing_block = &ContainingBlock {
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size: ContainingBlockSize {
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inline: Au::zero(),
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block: SizeConstraint::default(),
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},
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style,
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};
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let mut grid_context = TaffyContainerContext {
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layout_context,
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positioning_context:
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&mut PositioningContext::new_for_containing_block_for_all_descendants(),
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content_box_size_override: containing_block,
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style,
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source_child_nodes: &self.children,
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specific_layout_info: None,
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child_specific_layout_infos: vec![None; self.children.len()],
|
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};
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let (max_content_output, min_content_output) = match style.clone_display().inside() {
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DisplayInside::Grid => {
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let max_content_output = taffy::compute_grid_layout(
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&mut grid_context,
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DUMMY_NODE_ID,
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max_content_inputs,
|
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);
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let min_content_output = taffy::compute_grid_layout(
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&mut grid_context,
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DUMMY_NODE_ID,
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min_content_inputs,
|
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);
|
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(max_content_output, min_content_output)
|
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},
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_ => panic!("Servo is only configured to use Taffy for CSS Grid layout"),
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};
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|
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let pb_sums = self
|
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.layout_style()
|
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.padding_border_margin(containing_block)
|
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.padding_border_sums;
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|
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InlineContentSizesResult {
|
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sizes: ContentSizes {
|
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max_content: Au::from_f32_px(max_content_output.size.width) - pb_sums.inline,
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min_content: Au::from_f32_px(min_content_output.size.width) - pb_sums.inline,
|
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},
|
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|
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// TODO: determine this accurately
|
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//
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// "true" is a safe default as it will prevent Servo from performing optimizations based
|
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// on the assumption that the node's size does not depend on block constraints.
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depends_on_block_constraints: true,
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}
|
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}
|
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}
|
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|
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impl TaffyContainer {
|
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/// <https://drafts.csswg.org/css-grid/#layout-algorithm>
|
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pub(crate) fn layout(
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&self,
|
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layout_context: &LayoutContext,
|
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positioning_context: &mut PositioningContext,
|
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content_box_size_override: &ContainingBlock,
|
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containing_block: &ContainingBlock,
|
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) -> CacheableLayoutResult {
|
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let mut container_ctx = TaffyContainerContext {
|
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layout_context,
|
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positioning_context,
|
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content_box_size_override,
|
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style: content_box_size_override.style,
|
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source_child_nodes: &self.children,
|
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specific_layout_info: None,
|
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child_specific_layout_infos: vec![None; self.children.len()],
|
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};
|
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|
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let container_style = &content_box_size_override.style;
|
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let align_items = container_style.clone_align_items();
|
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let justify_items = container_style.clone_justify_items();
|
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let pbm = self.layout_style().padding_border_margin(containing_block);
|
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|
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let known_dimensions = taffy::Size {
|
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width: Some(
|
||||
(content_box_size_override.size.inline + pbm.padding_border_sums.inline)
|
||||
.to_f32_px(),
|
||||
),
|
||||
height: content_box_size_override
|
||||
.size
|
||||
.block
|
||||
.to_definite()
|
||||
.map(Au::to_f32_px)
|
||||
.maybe_add(pbm.padding_border_sums.block.to_f32_px()),
|
||||
};
|
||||
|
||||
let taffy_containing_block = taffy::Size {
|
||||
width: Some(containing_block.size.inline.to_f32_px()),
|
||||
height: containing_block.size.block.to_definite().map(Au::to_f32_px),
|
||||
};
|
||||
|
||||
let layout_input = taffy::LayoutInput {
|
||||
run_mode: taffy::RunMode::PerformLayout,
|
||||
sizing_mode: taffy::SizingMode::InherentSize,
|
||||
axis: taffy::RequestedAxis::Vertical,
|
||||
vertical_margins_are_collapsible: taffy::Line::FALSE,
|
||||
|
||||
known_dimensions,
|
||||
parent_size: taffy_containing_block,
|
||||
available_space: taffy_containing_block.map(AvailableSpace::from),
|
||||
};
|
||||
|
||||
let output = match container_ctx.style.clone_display().inside() {
|
||||
DisplayInside::Grid => {
|
||||
taffy::compute_grid_layout(&mut container_ctx, DUMMY_NODE_ID, layout_input)
|
||||
},
|
||||
_ => panic!("Servo is only configured to use Taffy for CSS Grid layout"),
|
||||
};
|
||||
|
||||
// Convert `taffy::Layout` into Servo `Fragment`s
|
||||
// with container_ctx.child_specific_layout_infos will also moved to the corresponding `Fragment`s
|
||||
let fragments: Vec<Fragment> = self
|
||||
.children
|
||||
.iter()
|
||||
.map(|child| (**child).borrow_mut())
|
||||
.enumerate()
|
||||
.map(|(child_id, mut child)| {
|
||||
fn rect_to_physical_sides<T>(rect: taffy::Rect<T>) -> PhysicalSides<T> {
|
||||
PhysicalSides::new(rect.top, rect.right, rect.bottom, rect.left)
|
||||
}
|
||||
|
||||
fn size_and_pos_to_logical_rect<T: Default>(
|
||||
position: taffy::Point<T>,
|
||||
size: taffy::Size<T>,
|
||||
) -> PhysicalRect<T> {
|
||||
PhysicalRect::new(
|
||||
PhysicalPoint::new(position.x, position.y),
|
||||
PhysicalSize::new(size.width, size.height),
|
||||
)
|
||||
}
|
||||
|
||||
let layout = &child.taffy_layout;
|
||||
|
||||
let padding = rect_to_physical_sides(layout.padding.map(Au::from_f32_px));
|
||||
let border = rect_to_physical_sides(layout.border.map(Au::from_f32_px));
|
||||
let margin = rect_to_physical_sides(layout.margin.map(Au::from_f32_px));
|
||||
|
||||
// Compute content box size and position.
|
||||
//
|
||||
// For the x/y position we have to correct for the difference between the
|
||||
// content box and the border box for both the parent and the child.
|
||||
let content_size = size_and_pos_to_logical_rect(
|
||||
taffy::Point {
|
||||
x: Au::from_f32_px(
|
||||
layout.location.x + layout.padding.left + layout.border.left,
|
||||
) - pbm.padding.inline_start -
|
||||
pbm.border.inline_start,
|
||||
y: Au::from_f32_px(
|
||||
layout.location.y + layout.padding.top + layout.border.top,
|
||||
) - pbm.padding.block_start -
|
||||
pbm.border.block_start,
|
||||
},
|
||||
taffy::Size {
|
||||
width: layout.size.width -
|
||||
layout.padding.left -
|
||||
layout.padding.right -
|
||||
layout.border.left -
|
||||
layout.border.right,
|
||||
height: layout.size.height -
|
||||
layout.padding.top -
|
||||
layout.padding.bottom -
|
||||
layout.border.top -
|
||||
layout.border.bottom,
|
||||
}
|
||||
.map(Au::from_f32_px),
|
||||
);
|
||||
|
||||
let child_specific_layout_info: Option<SpecificLayoutInfo> =
|
||||
std::mem::take(&mut container_ctx.child_specific_layout_infos[child_id]);
|
||||
|
||||
let establishes_containing_block_for_absolute_descendants =
|
||||
if let TaffyItemBoxInner::InFlowBox(independent_box) = &child.taffy_level_box {
|
||||
child
|
||||
.style
|
||||
.establishes_containing_block_for_absolute_descendants(
|
||||
independent_box.base_fragment_info().flags,
|
||||
)
|
||||
} else {
|
||||
false
|
||||
};
|
||||
|
||||
let fragment = match &mut child.taffy_level_box {
|
||||
TaffyItemBoxInner::InFlowBox(independent_box) => {
|
||||
let mut fragment_info = independent_box.base_fragment_info();
|
||||
fragment_info
|
||||
.flags
|
||||
.insert(FragmentFlags::IS_FLEX_OR_GRID_ITEM);
|
||||
let mut box_fragment = BoxFragment::new(
|
||||
fragment_info,
|
||||
independent_box.style().clone(),
|
||||
std::mem::take(&mut child.child_fragments),
|
||||
content_size,
|
||||
padding,
|
||||
border,
|
||||
margin,
|
||||
None, /* clearance */
|
||||
)
|
||||
.with_baselines(Baselines {
|
||||
first: output.first_baselines.y.map(Au::from_f32_px),
|
||||
last: None,
|
||||
})
|
||||
.with_specific_layout_info(child_specific_layout_info);
|
||||
|
||||
if establishes_containing_block_for_absolute_descendants {
|
||||
child.positioning_context.layout_collected_children(
|
||||
container_ctx.layout_context,
|
||||
&mut box_fragment,
|
||||
);
|
||||
}
|
||||
|
||||
let fragment = Fragment::Box(ArcRefCell::new(box_fragment));
|
||||
|
||||
child
|
||||
.positioning_context
|
||||
.adjust_static_position_of_hoisted_fragments(
|
||||
&fragment,
|
||||
PositioningContextLength::zero(),
|
||||
);
|
||||
let child_positioning_context = std::mem::replace(
|
||||
&mut child.positioning_context,
|
||||
PositioningContext::new_for_containing_block_for_all_descendants(),
|
||||
);
|
||||
container_ctx
|
||||
.positioning_context
|
||||
.append(child_positioning_context);
|
||||
fragment
|
||||
},
|
||||
TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(abs_pos_box) => {
|
||||
fn resolve_alignment(value: AlignFlags, auto: AlignFlags) -> AlignFlags {
|
||||
match value {
|
||||
AlignFlags::AUTO => auto,
|
||||
AlignFlags::NORMAL => AlignFlags::STRETCH,
|
||||
value => value,
|
||||
}
|
||||
}
|
||||
|
||||
let hoisted_box = AbsolutelyPositionedBox::to_hoisted(
|
||||
abs_pos_box.clone(),
|
||||
PhysicalRect::from_size(PhysicalSize::new(
|
||||
Au::from_f32_px(output.size.width),
|
||||
Au::from_f32_px(output.size.height),
|
||||
)),
|
||||
LogicalVec2 {
|
||||
inline: resolve_alignment(
|
||||
child.style.clone_align_self().0.0,
|
||||
align_items.0,
|
||||
),
|
||||
block: resolve_alignment(
|
||||
child.style.clone_justify_self().0.0,
|
||||
justify_items.computed.0,
|
||||
),
|
||||
},
|
||||
container_ctx.style.writing_mode,
|
||||
);
|
||||
let hoisted_fragment = hoisted_box.fragment.clone();
|
||||
container_ctx.positioning_context.push(hoisted_box);
|
||||
Fragment::AbsoluteOrFixedPositioned(hoisted_fragment)
|
||||
},
|
||||
};
|
||||
|
||||
if let TaffyItemBoxInner::InFlowBox(independent_formatting_context) =
|
||||
&child.taffy_level_box
|
||||
{
|
||||
independent_formatting_context
|
||||
.base
|
||||
.set_fragment(fragment.clone());
|
||||
}
|
||||
fragment
|
||||
})
|
||||
.collect();
|
||||
|
||||
CacheableLayoutResult {
|
||||
fragments,
|
||||
content_block_size: Au::from_f32_px(output.size.height) - pbm.padding_border_sums.block,
|
||||
content_inline_size_for_table: None,
|
||||
baselines: Baselines::default(),
|
||||
|
||||
// TODO: determine this accurately
|
||||
//
|
||||
// "true" is a safe default as it will prevent Servo from performing optimizations based
|
||||
// on the assumption that the node's size does not depend on block constraints.
|
||||
depends_on_block_constraints: true,
|
||||
specific_layout_info: container_ctx.specific_layout_info,
|
||||
collapsible_margins_in_children: CollapsedBlockMargins::zero(),
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
pub(crate) fn layout_style(&self) -> LayoutStyle {
|
||||
LayoutStyle::Default(&self.style)
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue