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layout: Add an indefinite containing block for intrinsic sizing (#33204)

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When computing the min-content or max-content size of an element we
need to ignore `inline-size`, `min-inline-size` and `max-inline-size`.

However, we should take the block-axis sizing properties into account.
That's because the contents could have percentages depending on them,
which can then affect their inline size via an aspect ratio.

Therefore, this patch adds `IndefiniteContainingBlock`, which is similar
to `ContainingBlock`, but it allows an indefinite inline-size. This
struct is then passed arround during intrinsic sizing.

More refinement will be needed in follow-up patches in order to fully
address the problem.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Oriol Brufau 2024-08-29 16:10:46 +02:00 • committed by GitHub
parent 46dbe4ce32
commit 93abdf7cb5
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29 changed files with 600 additions and 332 deletions
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93
components/layout_2020/sizing.rs
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@ -8,13 +8,11 @@ use std::ops::{Add, AddAssign};
use app_units::Au;
use serde::Serialize;
use style::logical_geometry::WritingMode;
use style::properties::longhands::box_sizing::computed_value::T as BoxSizing;
use style::properties::ComputedValues;
use style::values::computed::Length;
use style::Zero;
use crate::style_ext::{Clamp, ComputedValuesExt};
use crate::{AuOrAuto, IndefiniteContainingBlock, LogicalVec2};
#[derive(PartialEq)]
pub(crate) enum IntrinsicSizingMode {
@ -111,70 +109,31 @@ impl From<Au> for ContentSizes {
pub(crate) fn outer_inline(
style: &ComputedValues,
containing_block_writing_mode: WritingMode,
get_content_size: impl FnOnce() -> ContentSizes,
get_auto_minimum: impl FnOnce() -> Au,
containing_block: &IndefiniteContainingBlock,
auto_minimum: &LogicalVec2<Au>,
get_content_size: impl FnOnce(&IndefiniteContainingBlock) -> ContentSizes,
) -> ContentSizes {
let padding = style.padding(containing_block_writing_mode);
let border = style.border_width(containing_block_writing_mode);
let margin = style.margin(containing_block_writing_mode);
// For margins and paddings, a cyclic percentage is resolved against zero
// for determining intrinsic size contributions.
// https://drafts.csswg.org/css-sizing-3/#min-percentage-contribution
let zero = Length::zero();
let pb_lengths = Au::from(
border.inline_sum() +
padding.inline_start.percentage_relative_to(zero) +
padding.inline_end.percentage_relative_to(zero),
);
let mut m_lengths = zero;
if let Some(m) = margin.inline_start.non_auto() {
m_lengths += m.percentage_relative_to(zero)
}
if let Some(m) = margin.inline_end.non_auto() {
m_lengths += m.percentage_relative_to(zero)
}
let box_sizing = style.get_position().box_sizing;
let inline_size = style
.box_size(containing_block_writing_mode)
.inline
.non_auto()
// Percentages for 'width' are treated as 'auto'
.and_then(|lp| lp.to_length());
let min_inline_size = style
.min_box_size(containing_block_writing_mode)
.inline
// Percentages for 'min-width' are treated as zero
.percentage_relative_to(zero)
.map(Au::from)
.auto_is(get_auto_minimum);
let max_inline_size = style
.max_box_size(containing_block_writing_mode)
.inline
// Percentages for 'max-width' are treated as 'none'
.and_then(|lp| lp.to_length())
.map(Au::from);
let clamp = |l: Au| l.clamp_between_extremums(min_inline_size, max_inline_size);
let border_box_sizes = match inline_size {
Some(non_auto) => {
let clamped = clamp(non_auto.into());
let border_box_size = match box_sizing {
BoxSizing::ContentBox => clamped + pb_lengths,
BoxSizing::BorderBox => clamped,
};
border_box_size.into()
},
None => get_content_size().map(|content_box_size| {
match box_sizing {
// Clamp to 'min-width' and 'max-width', which are sizing the…
BoxSizing::ContentBox => clamp(content_box_size) + pb_lengths,
BoxSizing::BorderBox => clamp(content_box_size + pb_lengths),
}
}),
let (content_box_size, content_min_size, content_max_size, pbm) =
style.content_box_sizes_and_padding_border_margin(containing_block);
let content_min_size = LogicalVec2 {
inline: content_min_size.inline.auto_is(|| auto_minimum.inline),
block: content_min_size.block.auto_is(|| auto_minimum.block),
};
border_box_sizes.map(|s| s + m_lengths.into())
let pbm_inline_sum = pbm.padding_border_sums.inline +
pbm.margin.inline_start.auto_is(Au::zero) +
pbm.margin.inline_end.auto_is(Au::zero);
let adjust = |v: Au| {
v.clamp_between_extremums(content_min_size.inline, content_max_size.inline) + pbm_inline_sum
};
match content_box_size.inline {
AuOrAuto::LengthPercentage(inline_size) => adjust(inline_size).into(),
AuOrAuto::Auto => {
let block_size = content_box_size
.block
.map(|v| v.clamp_between_extremums(content_min_size.block, content_max_size.block));
let containing_block_for_children =
IndefiniteContainingBlock::new_for_style_and_block_size(style, block_size);
get_content_size(&containing_block_for_children).map(adjust)
},
}
}