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layout: Avoid layout sometimes when stretching (#33967)

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This is the second flexbox caching change. It seeks to detect when a
relayout can be avoided in the case of a stretching flex item. This
heuristic can be combined, because currently we still do relayout
sometimes when we do not need to.

For instance currently we always relayout when a flex child is itself a
column flex. This only needs to happen when the grandchildren themselves
grow or shrink. That optimization is perhaps a lower priority as
`flex-grow: 0 / flex-shrink: 1` is the default behavior for flex.

Since this change means we more consistenly zero out the percentage part
of `calc` expressions when they have circular dependencies, this causes one
test to start failing (`/css/css-values/calc-min-height-block-1.html`).
This is related to w3c/csswg-drafts#10969, which is pending on further
discussion in the working group.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2024-10-24 10:44:30 -07:00 • committed by GitHub
parent 638b520186
commit 52db185568
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12 changed files with 490 additions and 257 deletions
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25
components/layout_2020/sizing.rs
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@ -11,7 +11,7 @@ use serde::Serialize;
use style::properties::ComputedValues;
use style::Zero;
use crate::style_ext::{Clamp, ComputedValuesExt};
use crate::style_ext::{Clamp, ComputedValuesExt, ContentBoxSizesAndPBMDeprecated};
use crate::{AuOrAuto, IndefiniteContainingBlock, LogicalVec2};
#[derive(PartialEq)]
@ -120,21 +120,24 @@ pub(crate) fn outer_inline(
auto_block_size_stretches_to_containing_block: bool,
get_content_size: impl FnOnce(&IndefiniteContainingBlock) -> InlineContentSizesResult,
) -> InlineContentSizesResult {
let (
let ContentBoxSizesAndPBMDeprecated {
content_box_size,
content_min_size,
content_max_size,
content_min_box_size,
content_max_box_size,
pbm,
mut depends_on_block_constraints,
) = style.content_box_sizes_and_padding_border_margin_deprecated(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),
} = style
.content_box_sizes_and_padding_border_margin(containing_block)
.into();
let content_box_min_size = LogicalVec2 {
inline: content_min_box_size.inline.auto_is(|| auto_minimum.inline),
block: content_min_box_size.block.auto_is(|| auto_minimum.block),
};
let margin = pbm.margin.map(|v| v.auto_is(Au::zero));
let pbm_inline_sum = pbm.padding_border_sums.inline + margin.inline_sum();
let adjust = |v: Au| {
v.clamp_between_extremums(content_min_size.inline, content_max_size.inline) + pbm_inline_sum
v.clamp_between_extremums(content_box_min_size.inline, content_max_box_size.inline) +
pbm_inline_sum
};
match content_box_size.inline {
AuOrAuto::LengthPercentage(inline_size) => InlineContentSizesResult {
@ -151,7 +154,9 @@ pub(crate) fn outer_inline(
} else {
content_box_size.block
}
.map(|v| v.clamp_between_extremums(content_min_size.block, content_max_size.block));
.map(|v| {
v.clamp_between_extremums(content_box_min_size.block, content_max_box_size.block)
});
let containing_block_for_children =
IndefiniteContainingBlock::new_for_style_and_block_size(style, block_size);
let content_result = get_content_size(&containing_block_for_children);