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3d320fa96a
* Use 2024 style edition Signed-off-by: Simon Wülker <simon.wuelker@arcor.de> * Reformat all code Signed-off-by: Simon Wülker <simon.wuelker@arcor.de> --------- Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
1084 lines
43 KiB
Rust
1084 lines
43 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 style::Zero;
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use style::color::AbsoluteColor;
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use style::computed_values::direction::T as Direction;
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use style::computed_values::isolation::T as ComputedIsolation;
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use style::computed_values::mix_blend_mode::T as ComputedMixBlendMode;
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use style::computed_values::position::T as ComputedPosition;
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use style::computed_values::transform_style::T as ComputedTransformStyle;
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use style::computed_values::unicode_bidi::T as UnicodeBidi;
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use style::logical_geometry::{Direction as AxisDirection, WritingMode};
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use style::properties::ComputedValues;
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use style::properties::longhands::backface_visibility::computed_value::T as BackfaceVisiblity;
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use style::properties::longhands::box_sizing::computed_value::T as BoxSizing;
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use style::properties::longhands::column_span::computed_value::T as ColumnSpan;
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use style::properties::style_structs::Border;
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use style::servo::selector_parser::PseudoElement;
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use style::values::CSSFloat;
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use style::values::computed::basic_shape::ClipPath;
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use style::values::computed::image::Image as ComputedImageLayer;
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use style::values::computed::{AlignItems, BorderStyle, Color, Inset, LengthPercentage, Margin};
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use style::values::generics::box_::Perspective;
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use style::values::generics::position::{GenericAspectRatio, PreferredRatio};
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use style::values::specified::align::AlignFlags;
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use style::values::specified::{Overflow, box_ as stylo};
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use webrender_api as wr;
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use crate::dom_traversal::Contents;
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use crate::fragment_tree::FragmentFlags;
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use crate::geom::{
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AuOrAuto, LengthPercentageOrAuto, LogicalSides, LogicalVec2, PhysicalSides, PhysicalSize, Size,
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Sizes,
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};
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use crate::table::TableLayoutStyle;
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use crate::{ContainingBlock, IndefiniteContainingBlock};
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#[derive(Clone, Copy, Eq, PartialEq)]
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pub(crate) enum Display {
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None,
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Contents,
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GeneratingBox(DisplayGeneratingBox),
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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pub(crate) enum DisplayGeneratingBox {
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OutsideInside {
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outside: DisplayOutside,
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inside: DisplayInside,
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},
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/// <https://drafts.csswg.org/css-display-3/#layout-specific-display>
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LayoutInternal(DisplayLayoutInternal),
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}
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#[derive(Clone, Copy, Debug)]
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pub struct AxesOverflow {
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pub x: Overflow,
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pub y: Overflow,
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}
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impl DisplayGeneratingBox {
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pub(crate) fn display_inside(&self) -> DisplayInside {
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match *self {
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DisplayGeneratingBox::OutsideInside { inside, .. } => inside,
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DisplayGeneratingBox::LayoutInternal(layout_internal) => {
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layout_internal.display_inside()
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},
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}
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}
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pub(crate) fn used_value_for_contents(&self, contents: &Contents) -> Self {
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// From <https://www.w3.org/TR/css-display-3/#layout-specific-display>:
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// > When the display property of a replaced element computes to one of
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// > the layout-internal values, it is handled as having a used value of
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// > inline.
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if matches!(self, Self::LayoutInternal(_)) && contents.is_replaced() {
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Self::OutsideInside {
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outside: DisplayOutside::Inline,
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inside: DisplayInside::Flow {
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is_list_item: false,
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},
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}
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} else {
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*self
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}
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}
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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pub(crate) enum DisplayOutside {
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Block,
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Inline,
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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pub(crate) enum DisplayInside {
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// “list-items are limited to the Flow Layout display types”
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// <https://drafts.csswg.org/css-display/#list-items>
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Flow { is_list_item: bool },
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FlowRoot { is_list_item: bool },
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Flex,
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Grid,
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Table,
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}
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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#[allow(clippy::enum_variant_names)]
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/// <https://drafts.csswg.org/css-display-3/#layout-specific-display>
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pub(crate) enum DisplayLayoutInternal {
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TableCaption,
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TableCell,
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TableColumn,
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TableColumnGroup,
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TableFooterGroup,
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TableHeaderGroup,
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TableRow,
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TableRowGroup,
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}
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impl DisplayLayoutInternal {
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/// <https://drafts.csswg.org/css-display-3/#layout-specific-displa>
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pub(crate) fn display_inside(&self) -> DisplayInside {
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// When we add ruby, the display_inside of ruby must be Flow.
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// TODO: this should be unreachable for everything but
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// table cell and caption, once we have box tree fixups.
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DisplayInside::FlowRoot {
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is_list_item: false,
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}
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}
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}
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/// Percentages resolved but not `auto` margins
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#[derive(Clone, Debug)]
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pub(crate) struct PaddingBorderMargin {
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pub padding: LogicalSides<Au>,
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pub border: LogicalSides<Au>,
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pub margin: LogicalSides<AuOrAuto>,
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/// Pre-computed sums in each axis
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pub padding_border_sums: LogicalVec2<Au>,
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}
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impl PaddingBorderMargin {
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pub(crate) fn zero() -> Self {
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Self {
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padding: LogicalSides::zero(),
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border: LogicalSides::zero(),
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margin: LogicalSides::zero(),
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padding_border_sums: LogicalVec2::zero(),
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}
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}
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}
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/// Resolved `aspect-ratio` property with respect to a specific element. Depends
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/// on that element's `box-sizing` (and padding and border, if that `box-sizing`
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/// is `border-box`).
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#[derive(Clone, Copy, Debug)]
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pub(crate) struct AspectRatio {
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/// If the element that this aspect ratio belongs to uses box-sizing:
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/// border-box, and the aspect-ratio property does not contain "auto", then
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/// the aspect ratio is in respect to the border box. This will then contain
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/// the summed sizes of the padding and border. Otherwise, it's 0.
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box_sizing_adjustment: LogicalVec2<Au>,
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/// The ratio itself (inline over block).
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i_over_b: CSSFloat,
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}
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impl AspectRatio {
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/// Given one side length, compute the other one.
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pub(crate) fn compute_dependent_size(
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&self,
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ratio_dependent_axis: AxisDirection,
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ratio_determining_size: Au,
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) -> Au {
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match ratio_dependent_axis {
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// Calculate the inline size from the block size
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AxisDirection::Inline => {
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(ratio_determining_size + self.box_sizing_adjustment.block).scale_by(self.i_over_b) -
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self.box_sizing_adjustment.inline
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},
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// Calculate the block size from the inline size
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AxisDirection::Block => {
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(ratio_determining_size + self.box_sizing_adjustment.inline)
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.scale_by(1.0 / self.i_over_b) -
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self.box_sizing_adjustment.block
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},
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}
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}
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pub(crate) fn from_content_ratio(i_over_b: CSSFloat) -> Self {
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Self {
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box_sizing_adjustment: LogicalVec2::zero(),
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i_over_b,
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}
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}
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}
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#[derive(Clone)]
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pub(crate) struct ContentBoxSizesAndPBM {
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pub content_box_sizes: LogicalVec2<Sizes>,
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pub pbm: PaddingBorderMargin,
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pub depends_on_block_constraints: bool,
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}
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#[derive(Clone, Debug, PartialEq)]
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pub(crate) struct BorderStyleColor {
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pub style: BorderStyle,
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pub color: AbsoluteColor,
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}
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impl BorderStyleColor {
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pub(crate) fn new(style: BorderStyle, color: AbsoluteColor) -> Self {
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Self { style, color }
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}
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pub(crate) fn from_border(
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border: &Border,
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current_color: &AbsoluteColor,
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) -> PhysicalSides<Self> {
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let resolve = |color: &Color| color.resolve_to_absolute(current_color);
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PhysicalSides::<Self>::new(
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Self::new(border.border_top_style, resolve(&border.border_top_color)),
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Self::new(
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border.border_right_style,
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resolve(&border.border_right_color),
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),
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Self::new(
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border.border_bottom_style,
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resolve(&border.border_bottom_color),
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),
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Self::new(border.border_left_style, resolve(&border.border_left_color)),
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)
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}
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pub(crate) fn hidden() -> Self {
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Self::new(BorderStyle::Hidden, AbsoluteColor::TRANSPARENT_BLACK)
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}
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}
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impl Default for BorderStyleColor {
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fn default() -> Self {
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Self::new(BorderStyle::None, AbsoluteColor::TRANSPARENT_BLACK)
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}
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}
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pub(crate) trait ComputedValuesExt {
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fn physical_box_offsets(&self) -> PhysicalSides<LengthPercentageOrAuto<'_>>;
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fn box_offsets(&self, writing_mode: WritingMode) -> LogicalSides<LengthPercentageOrAuto<'_>>;
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fn box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>>;
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fn min_box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>>;
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fn max_box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>>;
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fn content_box_size_for_box_size(
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&self,
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box_size: LogicalVec2<Size<Au>>,
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pbm: &PaddingBorderMargin,
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) -> LogicalVec2<Size<Au>>;
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fn content_min_box_size_for_min_size(
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&self,
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box_size: LogicalVec2<Size<Au>>,
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pbm: &PaddingBorderMargin,
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) -> LogicalVec2<Size<Au>>;
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fn content_max_box_size_for_max_size(
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&self,
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box_size: LogicalVec2<Size<Au>>,
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pbm: &PaddingBorderMargin,
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) -> LogicalVec2<Size<Au>>;
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fn border_style_color(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalSides<BorderStyleColor>;
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fn physical_margin(&self) -> PhysicalSides<LengthPercentageOrAuto<'_>>;
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fn margin(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalSides<LengthPercentageOrAuto<'_>>;
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fn has_transform_or_perspective(&self, fragment_flags: FragmentFlags) -> bool;
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fn effective_z_index(&self, fragment_flags: FragmentFlags) -> i32;
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fn effective_overflow(&self, fragment_flags: FragmentFlags) -> AxesOverflow;
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fn establishes_block_formatting_context(&self, fragment_flags: FragmentFlags) -> bool;
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fn establishes_stacking_context(&self, fragment_flags: FragmentFlags) -> bool;
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fn establishes_scroll_container(&self, fragment_flags: FragmentFlags) -> bool;
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fn establishes_containing_block_for_absolute_descendants(
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&self,
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fragment_flags: FragmentFlags,
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) -> bool;
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fn establishes_containing_block_for_all_descendants(
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&self,
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fragment_flags: FragmentFlags,
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) -> bool;
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fn preferred_aspect_ratio(
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&self,
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natural_aspect_ratio: Option<CSSFloat>,
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padding_border_sums: &LogicalVec2<Au>,
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) -> Option<AspectRatio>;
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fn background_is_transparent(&self) -> bool;
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fn get_webrender_primitive_flags(&self) -> wr::PrimitiveFlags;
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fn bidi_control_chars(&self) -> (&'static str, &'static str);
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fn resolve_align_self(
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&self,
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resolved_auto_value: AlignItems,
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resolved_normal_value: AlignItems,
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) -> AlignItems;
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fn depends_on_block_constraints_due_to_relative_positioning(
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&self,
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writing_mode: WritingMode,
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) -> bool;
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}
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impl ComputedValuesExt for ComputedValues {
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fn physical_box_offsets(&self) -> PhysicalSides<LengthPercentageOrAuto<'_>> {
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fn convert(inset: &Inset) -> LengthPercentageOrAuto<'_> {
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match inset {
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Inset::LengthPercentage(ref v) => LengthPercentageOrAuto::LengthPercentage(v),
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Inset::Auto => LengthPercentageOrAuto::Auto,
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Inset::AnchorFunction(_) => unreachable!("anchor() should be disabled"),
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Inset::AnchorSizeFunction(_) => unreachable!("anchor-size() should be disabled"),
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}
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}
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let position = self.get_position();
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PhysicalSides::new(
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convert(&position.top),
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convert(&position.right),
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convert(&position.bottom),
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convert(&position.left),
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)
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}
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fn box_offsets(&self, writing_mode: WritingMode) -> LogicalSides<LengthPercentageOrAuto<'_>> {
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LogicalSides::from_physical(&self.physical_box_offsets(), writing_mode)
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}
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fn box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>> {
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let position = self.get_position();
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LogicalVec2::from_physical_size(
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&PhysicalSize::new(
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position.clone_width().into(),
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position.clone_height().into(),
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),
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containing_block_writing_mode,
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)
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}
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fn min_box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>> {
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let position = self.get_position();
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LogicalVec2::from_physical_size(
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&PhysicalSize::new(
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position.clone_min_width().into(),
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position.clone_min_height().into(),
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),
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containing_block_writing_mode,
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)
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}
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fn max_box_size(
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&self,
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containing_block_writing_mode: WritingMode,
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) -> LogicalVec2<Size<LengthPercentage>> {
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let position = self.get_position();
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LogicalVec2::from_physical_size(
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&PhysicalSize::new(
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position.clone_max_width().into(),
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position.clone_max_height().into(),
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),
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containing_block_writing_mode,
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)
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}
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fn content_box_size_for_box_size(
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&self,
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box_size: LogicalVec2<Size<Au>>,
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pbm: &PaddingBorderMargin,
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) -> LogicalVec2<Size<Au>> {
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||
match self.get_position().box_sizing {
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BoxSizing::ContentBox => box_size,
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// These may be negative, but will later be clamped by `min-width`/`min-height`
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// which is clamped to zero.
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BoxSizing::BorderBox => box_size.map_inline_and_block_sizes(
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|value| value - pbm.padding_border_sums.inline,
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|value| value - pbm.padding_border_sums.block,
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),
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}
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}
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|
||
fn content_min_box_size_for_min_size(
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||
&self,
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||
min_box_size: LogicalVec2<Size<Au>>,
|
||
pbm: &PaddingBorderMargin,
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||
) -> LogicalVec2<Size<Au>> {
|
||
match self.get_position().box_sizing {
|
||
BoxSizing::ContentBox => min_box_size,
|
||
// Clamp to zero to make sure the used size components are non-negative
|
||
BoxSizing::BorderBox => min_box_size.map_inline_and_block_sizes(
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||
|value| Au::zero().max(value - pbm.padding_border_sums.inline),
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||
|value| Au::zero().max(value - pbm.padding_border_sums.block),
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||
),
|
||
}
|
||
}
|
||
|
||
fn content_max_box_size_for_max_size(
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||
&self,
|
||
max_box_size: LogicalVec2<Size<Au>>,
|
||
pbm: &PaddingBorderMargin,
|
||
) -> LogicalVec2<Size<Au>> {
|
||
match self.get_position().box_sizing {
|
||
BoxSizing::ContentBox => max_box_size,
|
||
// This may be negative, but will later be clamped by `min-width`
|
||
// which itself is clamped to zero.
|
||
BoxSizing::BorderBox => max_box_size.map_inline_and_block_sizes(
|
||
|value| value - pbm.padding_border_sums.inline,
|
||
|value| value - pbm.padding_border_sums.block,
|
||
),
|
||
}
|
||
}
|
||
|
||
fn border_style_color(
|
||
&self,
|
||
containing_block_writing_mode: WritingMode,
|
||
) -> LogicalSides<BorderStyleColor> {
|
||
let current_color = self.get_inherited_text().clone_color();
|
||
LogicalSides::from_physical(
|
||
&BorderStyleColor::from_border(self.get_border(), ¤t_color),
|
||
containing_block_writing_mode,
|
||
)
|
||
}
|
||
|
||
fn physical_margin(&self) -> PhysicalSides<LengthPercentageOrAuto<'_>> {
|
||
fn convert(inset: &Margin) -> LengthPercentageOrAuto<'_> {
|
||
match inset {
|
||
Margin::LengthPercentage(ref v) => LengthPercentageOrAuto::LengthPercentage(v),
|
||
Margin::Auto => LengthPercentageOrAuto::Auto,
|
||
Margin::AnchorSizeFunction(_) => unreachable!("anchor-size() should be disabled"),
|
||
}
|
||
}
|
||
let margin = self.get_margin();
|
||
PhysicalSides::new(
|
||
convert(&margin.margin_top),
|
||
convert(&margin.margin_right),
|
||
convert(&margin.margin_bottom),
|
||
convert(&margin.margin_left),
|
||
)
|
||
}
|
||
|
||
fn margin(
|
||
&self,
|
||
containing_block_writing_mode: WritingMode,
|
||
) -> LogicalSides<LengthPercentageOrAuto<'_>> {
|
||
LogicalSides::from_physical(&self.physical_margin(), containing_block_writing_mode)
|
||
}
|
||
|
||
/// Returns true if this style has a transform, or perspective property set and
|
||
/// it applies to this element.
|
||
fn has_transform_or_perspective(&self, fragment_flags: FragmentFlags) -> bool {
|
||
// "A transformable element is an element in one of these categories:
|
||
// * all elements whose layout is governed by the CSS box model except for
|
||
// non-replaced inline boxes, table-column boxes, and table-column-group
|
||
// boxes,
|
||
// * all SVG paint server elements, the clipPath element and SVG renderable
|
||
// elements with the exception of any descendant element of text content
|
||
// elements."
|
||
// https://drafts.csswg.org/css-transforms/#transformable-element
|
||
if self.get_box().display.is_inline_flow() &&
|
||
!fragment_flags.contains(FragmentFlags::IS_REPLACED)
|
||
{
|
||
return false;
|
||
}
|
||
|
||
!self.get_box().transform.0.is_empty() || self.get_box().perspective != Perspective::None
|
||
}
|
||
|
||
/// Get the effective z-index of this fragment. Z-indices only apply to positioned elements
|
||
/// per CSS 2 9.9.1 (<http://www.w3.org/TR/CSS2/visuren.html#z-index>), so this value may differ
|
||
/// from the value specified in the style.
|
||
fn effective_z_index(&self, fragment_flags: FragmentFlags) -> i32 {
|
||
// From <https://drafts.csswg.org/css-flexbox/#painting>:
|
||
// > Flex items paint exactly the same as inline blocks [CSS2], except that order-modified
|
||
// > document order is used in place of raw document order, and z-index values other than auto
|
||
// > create a stacking context even if position is static (behaving exactly as if position
|
||
// > were relative).
|
||
match self.get_box().position {
|
||
ComputedPosition::Static if !fragment_flags.contains(FragmentFlags::IS_FLEX_ITEM) => 0,
|
||
_ => self.get_position().z_index.integer_or(0),
|
||
}
|
||
}
|
||
|
||
/// Get the effective overflow of this box. The property only applies to block containers,
|
||
/// flex containers, and grid containers. And some box types only accept a few values.
|
||
/// <https://www.w3.org/TR/css-overflow-3/#overflow-control>
|
||
fn effective_overflow(&self, fragment_flags: FragmentFlags) -> AxesOverflow {
|
||
let style_box = self.get_box();
|
||
let mut overflow_x = style_box.overflow_x;
|
||
let mut overflow_y = style_box.overflow_y;
|
||
|
||
// From <https://www.w3.org/TR/css-overflow-4/#overflow-control>:
|
||
// "On replaced elements, the used values of all computed values other than visible is clip."
|
||
if fragment_flags.contains(FragmentFlags::IS_REPLACED) {
|
||
if overflow_x != Overflow::Visible {
|
||
overflow_x = Overflow::Clip;
|
||
}
|
||
if overflow_y != Overflow::Visible {
|
||
overflow_y = Overflow::Clip;
|
||
}
|
||
return AxesOverflow {
|
||
x: overflow_x,
|
||
y: overflow_y,
|
||
};
|
||
}
|
||
|
||
let ignores_overflow = match style_box.display.inside() {
|
||
stylo::DisplayInside::Table => {
|
||
// According to <https://drafts.csswg.org/css-tables/#global-style-overrides>,
|
||
// - overflow applies to table-wrapper boxes and not to table grid boxes.
|
||
// That's what Blink and WebKit do, however Firefox matches a CSSWG resolution that says
|
||
// the opposite: <https://lists.w3.org/Archives/Public/www-style/2012Aug/0298.html>
|
||
// Due to the way that we implement table-wrapper boxes, it's easier to align with Firefox.
|
||
// - Tables ignore overflow values different than visible, clip and hidden.
|
||
// This affects both axes, to ensure they have the same scrollability.
|
||
!matches!(self.pseudo(), Some(PseudoElement::ServoTableGrid)) ||
|
||
matches!(overflow_x, Overflow::Auto | Overflow::Scroll) ||
|
||
matches!(overflow_y, Overflow::Auto | Overflow::Scroll)
|
||
},
|
||
stylo::DisplayInside::TableColumn |
|
||
stylo::DisplayInside::TableColumnGroup |
|
||
stylo::DisplayInside::TableRow |
|
||
stylo::DisplayInside::TableRowGroup |
|
||
stylo::DisplayInside::TableHeaderGroup |
|
||
stylo::DisplayInside::TableFooterGroup => {
|
||
// <https://drafts.csswg.org/css-tables/#global-style-overrides>
|
||
// Table-track and table-track-group boxes ignore overflow.
|
||
true
|
||
},
|
||
_ => false,
|
||
};
|
||
|
||
if ignores_overflow {
|
||
AxesOverflow {
|
||
x: Overflow::Visible,
|
||
y: Overflow::Visible,
|
||
}
|
||
} else {
|
||
AxesOverflow {
|
||
x: overflow_x,
|
||
y: overflow_y,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Return true if this style is a normal block and establishes
|
||
/// a new block formatting context.
|
||
fn establishes_block_formatting_context(&self, fragment_flags: FragmentFlags) -> bool {
|
||
if self.establishes_scroll_container(fragment_flags) {
|
||
return true;
|
||
}
|
||
|
||
if self.get_column().is_multicol() {
|
||
return true;
|
||
}
|
||
|
||
if self.get_column().column_span == ColumnSpan::All {
|
||
return true;
|
||
}
|
||
|
||
// Per <https://drafts.csswg.org/css-align/#distribution-block>:
|
||
// Block containers with an `align-content` value that is not `normal` should
|
||
// form an independent block formatting context. This should really only happen
|
||
// for block containers, but we do not support subgrid containers yet which is the
|
||
// only other case.
|
||
if self.get_position().align_content.0.primary() != AlignFlags::NORMAL {
|
||
return true;
|
||
}
|
||
|
||
// TODO: We need to handle CSS Contain here.
|
||
false
|
||
}
|
||
|
||
/// Whether or not the `overflow` value of this style establishes a scroll container.
|
||
fn establishes_scroll_container(&self, fragment_flags: FragmentFlags) -> bool {
|
||
// Checking one axis suffices, because the computed value ensures that
|
||
// either both axes are scrollable, or none is scrollable.
|
||
self.effective_overflow(fragment_flags).x.is_scrollable()
|
||
}
|
||
|
||
/// Returns true if this fragment establishes a new stacking context and false otherwise.
|
||
fn establishes_stacking_context(&self, fragment_flags: FragmentFlags) -> bool {
|
||
let effects = self.get_effects();
|
||
if effects.opacity != 1.0 {
|
||
return true;
|
||
}
|
||
|
||
if effects.mix_blend_mode != ComputedMixBlendMode::Normal {
|
||
return true;
|
||
}
|
||
|
||
if self.has_transform_or_perspective(fragment_flags) {
|
||
return true;
|
||
}
|
||
|
||
if !self.get_effects().filter.0.is_empty() {
|
||
return true;
|
||
}
|
||
|
||
if self.get_box().transform_style == ComputedTransformStyle::Preserve3d ||
|
||
self.overrides_transform_style()
|
||
{
|
||
return true;
|
||
}
|
||
|
||
if self.get_box().isolation == ComputedIsolation::Isolate {
|
||
return true;
|
||
}
|
||
|
||
// Fixed position and sticky position always create stacking contexts.
|
||
// TODO(mrobinson): We need to handle sticky positioning here when we support it.
|
||
if self.get_box().position == ComputedPosition::Fixed {
|
||
return true;
|
||
}
|
||
|
||
if self.get_svg().clip_path != ClipPath::None {
|
||
return true;
|
||
}
|
||
|
||
// Statically positioned fragments don't establish stacking contexts if the previous
|
||
// conditions are not fulfilled. Furthermore, z-index doesn't apply to statically
|
||
// positioned fragments (except for flex items, see below).
|
||
//
|
||
// From <https://drafts.csswg.org/css-flexbox/#painting>:
|
||
// > Flex items paint exactly the same as inline blocks [CSS2], except that order-modified
|
||
// > document order is used in place of raw document order, and z-index values other than auto
|
||
// > create a stacking context even if position is static (behaving exactly as if position
|
||
// > were relative).
|
||
if self.get_box().position == ComputedPosition::Static &&
|
||
!fragment_flags.contains(FragmentFlags::IS_FLEX_ITEM)
|
||
{
|
||
return false;
|
||
}
|
||
|
||
// For absolutely and relatively positioned fragments we only establish a stacking
|
||
// context if there is a z-index set.
|
||
// See https://www.w3.org/TR/CSS2/visuren.html#z-index
|
||
!self.get_position().z_index.is_auto()
|
||
}
|
||
|
||
/// Returns true if this style establishes a containing block for absolute
|
||
/// descendants (`position: absolute`). If this style happens to establish a
|
||
/// containing block for “all descendants” (ie including `position: fixed`
|
||
/// descendants) this method will return true, but a true return value does
|
||
/// not imply that the style establishes a containing block for all descendants.
|
||
/// Use `establishes_containing_block_for_all_descendants()` instead.
|
||
fn establishes_containing_block_for_absolute_descendants(
|
||
&self,
|
||
fragment_flags: FragmentFlags,
|
||
) -> bool {
|
||
if self.establishes_containing_block_for_all_descendants(fragment_flags) {
|
||
return true;
|
||
}
|
||
|
||
self.clone_position() != ComputedPosition::Static
|
||
}
|
||
|
||
/// Returns true if this style establishes a containing block for
|
||
/// all descendants, including fixed descendants (`position: fixed`).
|
||
/// Note that this also implies that it establishes a containing block
|
||
/// for absolute descendants (`position: absolute`).
|
||
fn establishes_containing_block_for_all_descendants(
|
||
&self,
|
||
fragment_flags: FragmentFlags,
|
||
) -> bool {
|
||
if self.has_transform_or_perspective(fragment_flags) {
|
||
return true;
|
||
}
|
||
|
||
if !self.get_effects().filter.0.is_empty() {
|
||
return true;
|
||
}
|
||
|
||
// TODO: We need to handle CSS Contain here.
|
||
false
|
||
}
|
||
|
||
/// Resolve the preferred aspect ratio according to the given natural aspect
|
||
/// ratio and the `aspect-ratio` property.
|
||
/// See <https://drafts.csswg.org/css-sizing-4/#aspect-ratio>.
|
||
fn preferred_aspect_ratio(
|
||
&self,
|
||
natural_aspect_ratio: Option<CSSFloat>,
|
||
padding_border_sums: &LogicalVec2<Au>,
|
||
) -> Option<AspectRatio> {
|
||
let GenericAspectRatio {
|
||
auto,
|
||
ratio: mut preferred_ratio,
|
||
} = self.clone_aspect_ratio();
|
||
|
||
// For all cases where a ratio is specified:
|
||
// "If the <ratio> is degenerate, the property instead behaves as auto."
|
||
if matches!(preferred_ratio, PreferredRatio::Ratio(ratio) if ratio.is_degenerate()) {
|
||
preferred_ratio = PreferredRatio::None;
|
||
}
|
||
|
||
match (auto, preferred_ratio) {
|
||
// The value `auto`. Either the ratio was not specified, or was
|
||
// degenerate and set to PreferredRatio::None above.
|
||
//
|
||
// "Replaced elements with a natural aspect ratio use that aspect
|
||
// ratio; otherwise the box has no preferred aspect ratio. Size
|
||
// calculations involving the aspect ratio work with the content box
|
||
// dimensions always."
|
||
(_, PreferredRatio::None) => natural_aspect_ratio.map(AspectRatio::from_content_ratio),
|
||
// "If both auto and a <ratio> are specified together, the preferred
|
||
// aspect ratio is the specified ratio of width / height unless it
|
||
// is a replaced element with a natural aspect ratio, in which case
|
||
// that aspect ratio is used instead. In all cases, size
|
||
// calculations involving the aspect ratio work with the content box
|
||
// dimensions always."
|
||
(true, PreferredRatio::Ratio(preferred_ratio)) => {
|
||
Some(AspectRatio::from_content_ratio(
|
||
natural_aspect_ratio
|
||
.unwrap_or_else(|| (preferred_ratio.0).0 / (preferred_ratio.1).0),
|
||
))
|
||
},
|
||
|
||
// "The box’s preferred aspect ratio is the specified ratio of width
|
||
// / height. Size calculations involving the aspect ratio work with
|
||
// the dimensions of the box specified by box-sizing."
|
||
(false, PreferredRatio::Ratio(preferred_ratio)) => {
|
||
// If the `box-sizing` is `border-box`, use the padding and
|
||
// border when calculating the aspect ratio.
|
||
let box_sizing_adjustment = match self.clone_box_sizing() {
|
||
BoxSizing::ContentBox => LogicalVec2::zero(),
|
||
BoxSizing::BorderBox => *padding_border_sums,
|
||
};
|
||
Some(AspectRatio {
|
||
i_over_b: (preferred_ratio.0).0 / (preferred_ratio.1).0,
|
||
box_sizing_adjustment,
|
||
})
|
||
},
|
||
}
|
||
}
|
||
|
||
/// Whether or not this style specifies a non-transparent background.
|
||
fn background_is_transparent(&self) -> bool {
|
||
let background = self.get_background();
|
||
let color = self.resolve_color(&background.background_color);
|
||
color.alpha == 0.0 &&
|
||
background
|
||
.background_image
|
||
.0
|
||
.iter()
|
||
.all(|layer| matches!(layer, ComputedImageLayer::None))
|
||
}
|
||
|
||
/// Generate appropriate WebRender `PrimitiveFlags` that should be used
|
||
/// for display items generated by the `Fragment` which owns this style.
|
||
fn get_webrender_primitive_flags(&self) -> wr::PrimitiveFlags {
|
||
match self.get_box().backface_visibility {
|
||
BackfaceVisiblity::Visible => wr::PrimitiveFlags::default(),
|
||
BackfaceVisiblity::Hidden => wr::PrimitiveFlags::empty(),
|
||
}
|
||
}
|
||
|
||
/// If the 'unicode-bidi' property has a value other than 'normal', return the bidi control codes
|
||
/// to inject before and after the text content of the element.
|
||
/// See the table in <http://dev.w3.org/csswg/css-writing-modes/#unicode-bidi>.
|
||
fn bidi_control_chars(&self) -> (&'static str, &'static str) {
|
||
match (
|
||
self.get_text().unicode_bidi,
|
||
self.get_inherited_box().direction,
|
||
) {
|
||
(UnicodeBidi::Normal, _) => ("", ""),
|
||
(UnicodeBidi::Embed, Direction::Ltr) => ("\u{202a}", "\u{202c}"),
|
||
(UnicodeBidi::Embed, Direction::Rtl) => ("\u{202b}", "\u{202c}"),
|
||
(UnicodeBidi::Isolate, Direction::Ltr) => ("\u{2066}", "\u{2069}"),
|
||
(UnicodeBidi::Isolate, Direction::Rtl) => ("\u{2067}", "\u{2069}"),
|
||
(UnicodeBidi::BidiOverride, Direction::Ltr) => ("\u{202d}", "\u{202c}"),
|
||
(UnicodeBidi::BidiOverride, Direction::Rtl) => ("\u{202e}", "\u{202c}"),
|
||
(UnicodeBidi::IsolateOverride, Direction::Ltr) => {
|
||
("\u{2068}\u{202d}", "\u{202c}\u{2069}")
|
||
},
|
||
(UnicodeBidi::IsolateOverride, Direction::Rtl) => {
|
||
("\u{2068}\u{202e}", "\u{202c}\u{2069}")
|
||
},
|
||
(UnicodeBidi::Plaintext, _) => ("\u{2068}", "\u{2069}"),
|
||
}
|
||
}
|
||
|
||
fn resolve_align_self(
|
||
&self,
|
||
resolved_auto_value: AlignItems,
|
||
resolved_normal_value: AlignItems,
|
||
) -> AlignItems {
|
||
match self.clone_align_self().0.0 {
|
||
AlignFlags::AUTO => resolved_auto_value,
|
||
AlignFlags::NORMAL => resolved_normal_value,
|
||
value => AlignItems(value),
|
||
}
|
||
}
|
||
|
||
fn depends_on_block_constraints_due_to_relative_positioning(
|
||
&self,
|
||
writing_mode: WritingMode,
|
||
) -> bool {
|
||
if !matches!(
|
||
self.get_box().position,
|
||
ComputedPosition::Relative | ComputedPosition::Sticky
|
||
) {
|
||
return false;
|
||
}
|
||
let box_offsets = self.box_offsets(writing_mode);
|
||
let has_percentage = |offset: LengthPercentageOrAuto<'_>| {
|
||
offset
|
||
.non_auto()
|
||
.is_some_and(LengthPercentage::has_percentage)
|
||
};
|
||
has_percentage(box_offsets.block_start) || has_percentage(box_offsets.block_end)
|
||
}
|
||
}
|
||
|
||
pub(crate) enum LayoutStyle<'a> {
|
||
Default(&'a ComputedValues),
|
||
Table(TableLayoutStyle<'a>),
|
||
}
|
||
|
||
impl LayoutStyle<'_> {
|
||
#[inline]
|
||
pub(crate) fn style(&self) -> &ComputedValues {
|
||
match self {
|
||
Self::Default(style) => style,
|
||
Self::Table(table) => table.style(),
|
||
}
|
||
}
|
||
|
||
#[inline]
|
||
pub(crate) fn is_table(&self) -> bool {
|
||
matches!(self, Self::Table(_))
|
||
}
|
||
|
||
pub(crate) fn content_box_sizes_and_padding_border_margin(
|
||
&self,
|
||
containing_block: &IndefiniteContainingBlock,
|
||
) -> ContentBoxSizesAndPBM {
|
||
// <https://drafts.csswg.org/css-sizing-3/#cyclic-percentage-contribution>
|
||
// If max size properties or preferred size properties are set to a value containing
|
||
// indefinite percentages, we treat the entire value as the initial value of the property.
|
||
// However, for min size properties, as well as for margins and paddings,
|
||
// we instead resolve indefinite percentages against zero.
|
||
let containing_block_size_or_zero =
|
||
containing_block.size.map(|value| value.unwrap_or_default());
|
||
let writing_mode = containing_block.writing_mode;
|
||
let pbm = self.padding_border_margin_with_writing_mode_and_containing_block_inline_size(
|
||
writing_mode,
|
||
containing_block_size_or_zero.inline,
|
||
);
|
||
let style = self.style();
|
||
let box_size = style.box_size(writing_mode);
|
||
let min_size = style.min_box_size(writing_mode);
|
||
let max_size = style.max_box_size(writing_mode);
|
||
let depends_on_block_constraints = |size: &Size<LengthPercentage>| {
|
||
match size {
|
||
// fit-content is like clamp(min-content, stretch, max-content), but currently
|
||
// min-content and max-content have the same behavior in the block axis,
|
||
// so there is no dependency on block constraints.
|
||
// TODO: for flex and grid layout, min-content and max-content should be different.
|
||
// TODO: We are assuming that Size::Initial doesn't stretch. However, it may actually
|
||
// stretch flex and grid items depending on the CSS Align properties, in that case
|
||
// the caller needs to take care of it.
|
||
Size::Stretch => true,
|
||
Size::Numeric(length_percentage) => length_percentage.has_percentage(),
|
||
_ => false,
|
||
}
|
||
};
|
||
|
||
let depends_on_block_constraints = depends_on_block_constraints(&box_size.block) ||
|
||
depends_on_block_constraints(&min_size.block) ||
|
||
depends_on_block_constraints(&max_size.block) ||
|
||
style.depends_on_block_constraints_due_to_relative_positioning(writing_mode);
|
||
|
||
let box_size = box_size.maybe_percentages_relative_to_basis(&containing_block.size);
|
||
let content_box_size = style
|
||
.content_box_size_for_box_size(box_size, &pbm)
|
||
.map(|v| v.map(Au::from));
|
||
let min_size = min_size.percentages_relative_to_basis(&containing_block_size_or_zero);
|
||
let content_min_box_size = style
|
||
.content_min_box_size_for_min_size(min_size, &pbm)
|
||
.map(|v| v.map(Au::from));
|
||
let max_size = max_size.maybe_percentages_relative_to_basis(&containing_block.size);
|
||
let content_max_box_size = style
|
||
.content_max_box_size_for_max_size(max_size, &pbm)
|
||
.map(|v| v.map(Au::from));
|
||
ContentBoxSizesAndPBM {
|
||
content_box_sizes: LogicalVec2 {
|
||
block: Sizes::new(
|
||
content_box_size.block,
|
||
content_min_box_size.block,
|
||
content_max_box_size.block,
|
||
),
|
||
inline: Sizes::new(
|
||
content_box_size.inline,
|
||
content_min_box_size.inline,
|
||
content_max_box_size.inline,
|
||
),
|
||
},
|
||
pbm,
|
||
depends_on_block_constraints,
|
||
}
|
||
}
|
||
|
||
pub(crate) fn padding_border_margin(
|
||
&self,
|
||
containing_block: &ContainingBlock,
|
||
) -> PaddingBorderMargin {
|
||
self.padding_border_margin_with_writing_mode_and_containing_block_inline_size(
|
||
containing_block.style.writing_mode,
|
||
containing_block.size.inline,
|
||
)
|
||
}
|
||
|
||
pub(crate) fn padding_border_margin_with_writing_mode_and_containing_block_inline_size(
|
||
&self,
|
||
writing_mode: WritingMode,
|
||
containing_block_inline_size: Au,
|
||
) -> PaddingBorderMargin {
|
||
let padding = self
|
||
.padding(writing_mode)
|
||
.percentages_relative_to(containing_block_inline_size);
|
||
let style = self.style();
|
||
let border = self.border_width(writing_mode);
|
||
let margin = style
|
||
.margin(writing_mode)
|
||
.percentages_relative_to(containing_block_inline_size);
|
||
PaddingBorderMargin {
|
||
padding_border_sums: LogicalVec2 {
|
||
inline: padding.inline_sum() + border.inline_sum(),
|
||
block: padding.block_sum() + border.block_sum(),
|
||
},
|
||
padding,
|
||
border,
|
||
margin,
|
||
}
|
||
}
|
||
|
||
pub(crate) fn padding(
|
||
&self,
|
||
containing_block_writing_mode: WritingMode,
|
||
) -> LogicalSides<LengthPercentage> {
|
||
if matches!(self, Self::Table(table) if table.collapses_borders()) {
|
||
// https://drafts.csswg.org/css-tables/#collapsed-style-overrides
|
||
// > The padding of the table-root is ignored (as if it was set to 0px).
|
||
return LogicalSides::zero();
|
||
}
|
||
let padding = self.style().get_padding().clone();
|
||
LogicalSides::from_physical(
|
||
&PhysicalSides::new(
|
||
padding.padding_top.0,
|
||
padding.padding_right.0,
|
||
padding.padding_bottom.0,
|
||
padding.padding_left.0,
|
||
),
|
||
containing_block_writing_mode,
|
||
)
|
||
}
|
||
|
||
pub(crate) fn border_width(
|
||
&self,
|
||
containing_block_writing_mode: WritingMode,
|
||
) -> LogicalSides<Au> {
|
||
let border_width = match self {
|
||
// For tables in collapsed-borders mode we halve the border widths, because
|
||
// > in this model, the width of the table includes half the table border.
|
||
// https://www.w3.org/TR/CSS22/tables.html#collapsing-borders
|
||
Self::Table(table) if table.collapses_borders() => table
|
||
.halved_collapsed_border_widths()
|
||
.to_physical(self.style().writing_mode),
|
||
_ => {
|
||
let border = self.style().get_border();
|
||
PhysicalSides::new(
|
||
border.border_top_width,
|
||
border.border_right_width,
|
||
border.border_bottom_width,
|
||
border.border_left_width,
|
||
)
|
||
},
|
||
};
|
||
LogicalSides::from_physical(&border_width, containing_block_writing_mode)
|
||
}
|
||
}
|
||
|
||
impl From<stylo::Display> for Display {
|
||
fn from(packed: stylo::Display) -> Self {
|
||
let outside = packed.outside();
|
||
let inside = packed.inside();
|
||
|
||
let outside = match outside {
|
||
stylo::DisplayOutside::Block => DisplayOutside::Block,
|
||
stylo::DisplayOutside::Inline => DisplayOutside::Inline,
|
||
stylo::DisplayOutside::TableCaption => {
|
||
return Display::GeneratingBox(DisplayGeneratingBox::LayoutInternal(
|
||
DisplayLayoutInternal::TableCaption,
|
||
));
|
||
},
|
||
stylo::DisplayOutside::InternalTable => {
|
||
let internal = match inside {
|
||
stylo::DisplayInside::TableRowGroup => DisplayLayoutInternal::TableRowGroup,
|
||
stylo::DisplayInside::TableColumn => DisplayLayoutInternal::TableColumn,
|
||
stylo::DisplayInside::TableColumnGroup => {
|
||
DisplayLayoutInternal::TableColumnGroup
|
||
},
|
||
stylo::DisplayInside::TableHeaderGroup => {
|
||
DisplayLayoutInternal::TableHeaderGroup
|
||
},
|
||
stylo::DisplayInside::TableFooterGroup => {
|
||
DisplayLayoutInternal::TableFooterGroup
|
||
},
|
||
stylo::DisplayInside::TableRow => DisplayLayoutInternal::TableRow,
|
||
stylo::DisplayInside::TableCell => DisplayLayoutInternal::TableCell,
|
||
_ => unreachable!("Non-internal DisplayInside found"),
|
||
};
|
||
return Display::GeneratingBox(DisplayGeneratingBox::LayoutInternal(internal));
|
||
},
|
||
// This should not be a value of DisplayInside, but oh well
|
||
// special-case display: contents because we still want it to work despite the early return
|
||
stylo::DisplayOutside::None if inside == stylo::DisplayInside::Contents => {
|
||
return Display::Contents;
|
||
},
|
||
stylo::DisplayOutside::None => return Display::None,
|
||
};
|
||
|
||
let inside = match packed.inside() {
|
||
stylo::DisplayInside::Flow => DisplayInside::Flow {
|
||
is_list_item: packed.is_list_item(),
|
||
},
|
||
stylo::DisplayInside::FlowRoot => DisplayInside::FlowRoot {
|
||
is_list_item: packed.is_list_item(),
|
||
},
|
||
stylo::DisplayInside::Flex => DisplayInside::Flex,
|
||
stylo::DisplayInside::Grid => DisplayInside::Grid,
|
||
|
||
// These should not be values of DisplayInside, but oh well
|
||
stylo::DisplayInside::None => return Display::None,
|
||
stylo::DisplayInside::Contents => return Display::Contents,
|
||
|
||
stylo::DisplayInside::Table => DisplayInside::Table,
|
||
stylo::DisplayInside::TableRowGroup |
|
||
stylo::DisplayInside::TableColumn |
|
||
stylo::DisplayInside::TableColumnGroup |
|
||
stylo::DisplayInside::TableHeaderGroup |
|
||
stylo::DisplayInside::TableFooterGroup |
|
||
stylo::DisplayInside::TableRow |
|
||
stylo::DisplayInside::TableCell => unreachable!("Internal DisplayInside found"),
|
||
};
|
||
Display::GeneratingBox(DisplayGeneratingBox::OutsideInside { outside, inside })
|
||
}
|
||
}
|
||
|
||
pub(crate) trait Clamp: Sized {
|
||
fn clamp_below_max(self, max: Option<Self>) -> Self;
|
||
fn clamp_between_extremums(self, min: Self, max: Option<Self>) -> Self;
|
||
}
|
||
|
||
impl Clamp for Au {
|
||
fn clamp_below_max(self, max: Option<Self>) -> Self {
|
||
match max {
|
||
None => self,
|
||
Some(max) => self.min(max),
|
||
}
|
||
}
|
||
|
||
fn clamp_between_extremums(self, min: Self, max: Option<Self>) -> Self {
|
||
self.clamp_below_max(max).max(min)
|
||
}
|
||
}
|