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19a7e95a6a
* Refactor computation of preferred aspect ratios Computing min/max-content sizes required a ContainingBlock in order to resolve the padding and border when determining the preferred aspect ratio. However, all callers already knew the padding and border, so they can compute the ratio themselves, and pass it directly instead of the ContainingBlock. Signed-off-by: Oriol Brufau <obrufau@igalia.com> * Put preferred aspect ratio into ConstraintSpace Signed-off-by: Oriol Brufau <obrufau@igalia.com> --------- Signed-off-by: Oriol Brufau <obrufau@igalia.com>
619 lines
27 KiB
Rust
619 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::{Baselines, IndependentFormattingContext, IndependentLayout};
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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};
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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(&mut 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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let mut abspos_box = AtomicRefCell::borrow_mut(abspos_box);
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cb(&mut 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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match independent_context {
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IndependentFormattingContext::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 = replaced.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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.contents
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.used_size_as_if_inline_element_from_content_box_sizes(
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containing_block,
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&replaced.style,
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replaced.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 = replaced
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.contents
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.make_fragments(&replaced.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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IndependentFormattingContext::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 = non_replaced.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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inline_size: Au::from_f32_px(inline_size),
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block_size: maybe_block_size,
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style: &non_replaced.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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inline_size: Au::zero(),
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block_size: GenericLengthPercentageOrAuto::Auto,
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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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|
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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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|
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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.inline_size + 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.block_size)
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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.inline_size.to_f32_px()),
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height: auto_or_to_option(containing_block.block_size).map(Au::to_f32_px),
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};
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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() {
|
|
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,
|
|
}
|
|
}
|
|
}
|