mirror of
https://github.com/servo/servo.git
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f1b8d49e77
This might make caching these values a bit easier in the future. Correcting the visibility of `ContainingBlock` also exposed some new rustc and clippy warnings that are fixed here. Signed-off-by: Martin Robinson <mrobinson@igalia.com> Co-authored-by: Oriol Brufau <obrufau@igalia.com>
625 lines
27 KiB
Rust
625 lines
27 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 atomic_refcell::{AtomicRef, AtomicRefCell, AtomicRefMut};
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use style::properties::ComputedValues;
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use style::values::generics::length::{GenericLengthPercentageOrAuto, LengthPercentageOrAuto};
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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 style::Zero;
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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::{TaffyContainer, TaffyItemBox, TaffyItemBoxInner, TaffyStyloStyle};
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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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IndependentLayout,
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};
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use crate::fragment_tree::{BoxFragment, CollapsedBlockMargins, Fragment};
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use crate::geom::{
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LogicalSides, LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSides, PhysicalSize, Size,
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SizeConstraint,
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};
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use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
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use crate::sizing::{ContentSizes, InlineContentSizesResult};
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use crate::style_ext::ComputedValuesExt;
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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(ref mut context) => cb(context),
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TaffyItemBoxInner::OutOfFlowAbsolutelyPositionedBox(ref 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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}
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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> = ChildIter where 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> = TaffyStyloStyle<&'a ComputedValues> where Self: 'a;
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type CacheMut<'b> = AtomicRefMut<'b, taffy::Cache> where Self: 'b;
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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 get_cache_mut(&mut self, node_id: taffy::NodeId) -> AtomicRefMut<'_, taffy::Cache> {
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let id = usize::from(node_id);
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let mut_ref: AtomicRefMut<'_, _> = (*self.source_child_nodes[id]).borrow_mut();
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AtomicRefMut::map(mut_ref, |node| &mut node.taffy_layout_cache)
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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_lpa(input: Option<f32>) -> LengthPercentageOrAuto<Au> {
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match input {
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None => LengthPercentageOrAuto::Auto,
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Some(length) => LengthPercentageOrAuto::LengthPercentage(Au::from_f32_px(length)),
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}
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}
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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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let style = independent_context.style();
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match &independent_context.contents {
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IndependentFormattingContextContents::Replaced(replaced) => {
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// TODO: re-evaluate sizing constraint conversions in light of recent layout_2020 changes
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let containing_block = &self.content_box_size_override;
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// Adjust known_dimensions from border box to content box
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let pbm = style.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 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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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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inline: option_f32_to_size(content_box_known_dimensions.width),
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block: option_f32_to_size(content_box_known_dimensions.height),
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},
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LogicalVec2 {
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inline: Size::Numeric(Au::zero()),
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block: Size::Numeric(Au::zero()),
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},
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LogicalVec2 {
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inline: Size::Initial,
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block: Size::Initial,
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},
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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 =
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replaced.make_fragments(style, content_box_size);
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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() +
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pbm.padding_border_sums.inline.to_f32_px()
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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() +
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pbm.padding_border_sums.block.to_f32_px()
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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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// TODO: re-evaluate sizing constraint conversions in light of recent layout_2020 changes
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let containing_block = &self.content_box_size_override;
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// Adjust known_dimensions from border box to content box
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let pbm = style.padding_border_margin(containing_block);
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let margin_sum = pbm.margin.auto_is(Au::zero).sum();
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let content_box_inset =
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(pbm.padding_border_sums + margin_sum).map(|v| v.to_f32_px());
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let content_box_known_dimensions =
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taffy::Size {
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width: inputs.known_dimensions.width.map(|width| {
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width - pbm.padding_border_sums.inline.to_f32_px()
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}),
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height: inputs.known_dimensions.height.map(|height| {
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height - pbm.padding_border_sums.block.to_f32_px()
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}),
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};
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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 = non_replaced
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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 + pbm.padding_border_sums.inline.to_f32_px(),
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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 maybe_block_size =
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option_f32_to_lpa(content_box_known_dimensions.height);
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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: maybe_block_size,
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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 = 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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let layout = non_replaced.layout(
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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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);
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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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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 + pbm.padding_border_sums.inline.to_f32_px(),
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height: block_size + pbm.padding_border_sums.block.to_f32_px(),
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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> = TaffyStyloStyle<&'a ComputedValues>
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where
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Self: 'a;
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type GridItemStyle<'a> = 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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}
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impl TaffyContainer {
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pub fn 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: GenericLengthPercentageOrAuto::Auto,
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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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};
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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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let pb_sums = style
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.padding_border_margin(containing_block)
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.padding_border_sums;
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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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// 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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/// <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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) -> IndependentLayout {
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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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};
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fn auto_or_to_option<T>(input: GenericLengthPercentageOrAuto<T>) -> Option<T> {
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match input {
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LengthPercentageOrAuto::LengthPercentage(val) => Some(val),
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LengthPercentageOrAuto::Auto => None,
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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 = container_style.padding_border_margin(containing_block);
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let known_dimensions = taffy::Size {
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width: Some(
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(content_box_size_override.size.inline + pbm.padding_border_sums.inline)
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.to_f32_px(),
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),
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height: auto_or_to_option(content_box_size_override.size.block)
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.map(Au::to_f32_px)
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.maybe_add(pbm.padding_border_sums.block.to_f32_px()),
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};
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let taffy_containing_block = taffy::Size {
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width: Some(containing_block.size.inline.to_f32_px()),
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height: auto_or_to_option(containing_block.size.block).map(Au::to_f32_px),
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};
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let layout_input = taffy::LayoutInput {
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run_mode: taffy::RunMode::PerformLayout,
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sizing_mode: taffy::SizingMode::InherentSize,
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axis: taffy::RequestedAxis::Vertical,
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vertical_margins_are_collapsible: taffy::Line::FALSE,
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known_dimensions,
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parent_size: taffy_containing_block,
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available_space: taffy_containing_block.map(AvailableSpace::from),
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};
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let output = match container_ctx.style.clone_display().inside() {
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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
|
|
let fragments: Vec<Fragment> = self
|
|
.children
|
|
.iter()
|
|
.map(|child| (**child).borrow_mut())
|
|
.map(|mut child| {
|
|
fn rect_to_logical_sides<T>(rect: taffy::Rect<T>) -> LogicalSides<T> {
|
|
LogicalSides {
|
|
inline_start: rect.left,
|
|
inline_end: rect.right,
|
|
block_start: rect.top,
|
|
block_end: rect.bottom,
|
|
}
|
|
}
|
|
|
|
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));
|
|
let logical_margin = rect_to_logical_sides(layout.margin.map(Au::from_f32_px));
|
|
let collapsed_margin = CollapsedBlockMargins::from_margin(&logical_margin);
|
|
|
|
// 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),
|
|
);
|
|
|
|
match &mut child.taffy_level_box {
|
|
TaffyItemBoxInner::InFlowBox(independent_box) => {
|
|
let fragment = Fragment::Box(
|
|
BoxFragment::new(
|
|
independent_box.base_fragment_info(),
|
|
independent_box.style().clone(),
|
|
std::mem::take(&mut child.child_fragments),
|
|
content_size,
|
|
padding,
|
|
border,
|
|
margin,
|
|
None, /* clearance */
|
|
collapsed_margin,
|
|
)
|
|
.with_baselines(Baselines {
|
|
first: output.first_baselines.y.map(Au::from_f32_px),
|
|
last: None,
|
|
}),
|
|
);
|
|
|
|
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)
|
|
},
|
|
}
|
|
})
|
|
.collect();
|
|
|
|
IndependentLayout {
|
|
fragments,
|
|
content_block_size: Au::from_f32_px(output.size.height) - pbm.padding_border_sums.block,
|
|
content_inline_size_for_table: Some(
|
|
Au::from_f32_px(output.size.width) - pbm.padding_border_sums.inline,
|
|
),
|
|
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,
|
|
}
|
|
}
|
|
}
|