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Resolve cyclic margin and padding percentages against zero (#30085)

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From https://drafts.csswg.org/css-sizing-3/#min-percentage-contribution

> For the min size properties, as well as for margins and paddings
> (and gutters), a cyclic percentage is resolved against zero
> for determining intrinsic size contributions.
This commit is contained in:
Oriol Brufau 2023-08-10 13:38:44 +02:00 • committed by GitHub
parent 8dceb8e412
commit c264993da8
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5 changed files with 31 additions and 79 deletions
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28
components/layout_2020/flow/inline.rs
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@ -27,7 +27,7 @@ use servo_arc::Arc;
use style::computed_values::white_space::T as WhiteSpace;
use style::logical_geometry::WritingMode;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthPercentage, Percentage};
use style::values::computed::Length;
use style::values::generics::text::LineHeight;
use style::values::specified::text::TextAlignKeyword;
use style::values::specified::text::TextDecorationLine;
@ -251,7 +251,6 @@ impl InlineFormattingContext {
containing_block_writing_mode: WritingMode,
paragraph: ContentSizes,
current_line: ContentSizes,
current_line_percentages: Percentage,
/// Size for whitepsace pending to be added to this line.
pending_whitespace: Length,
/// Whether or not this IFC has seen any non-whitespace content.
@ -274,11 +273,15 @@ impl InlineFormattingContext {
macro_rules! add {
($condition: ident, $side: ident) => {
if inline_box.$condition {
self.add_lengthpercentage(padding.$side);
self.add_length(border.$side);
// 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 mut length = padding.$side.percentage_relative_to(zero) + border.$side;
if let Some(lp) = margin.$side.non_auto() {
self.add_lengthpercentage(lp)
length += lp.percentage_relative_to(zero)
}
self.add_length(length);
}
};
}
@ -320,7 +323,7 @@ impl InlineFormattingContext {
}
},
InlineLevelBox::Atomic(atomic) => {
let (outer, pc) = atomic.outer_inline_content_sizes_and_percentages(
let outer = atomic.outer_inline_content_sizes(
self.layout_context,
self.containing_block_writing_mode,
);
@ -328,7 +331,6 @@ impl InlineFormattingContext {
self.current_line.min_content +=
self.pending_whitespace + outer.min_content;
self.current_line.max_content += outer.max_content;
self.current_line_percentages += pc;
self.pending_whitespace = Length::zero();
self.had_non_whitespace_content_yet = true;
},
@ -338,15 +340,6 @@ impl InlineFormattingContext {
}
}
fn add_lengthpercentage(&mut self, lp: &LengthPercentage) {
if let Some(l) = lp.to_length() {
self.add_length(l);
}
if let Some(p) = lp.to_percentage() {
self.current_line_percentages += p;
}
}
fn add_length(&mut self, l: Length) {
self.current_line.min_content += l;
self.current_line.max_content += l;
@ -360,8 +353,6 @@ impl InlineFormattingContext {
fn forced_line_break(&mut self) {
self.line_break_opportunity();
self.current_line
.adjust_for_pbm_percentages(take(&mut self.current_line_percentages));
self.paragraph
.max_content
.max_assign(take(&mut self.current_line.max_content));
@ -375,7 +366,6 @@ impl InlineFormattingContext {
containing_block_writing_mode,
paragraph: ContentSizes::zero(),
current_line: ContentSizes::zero(),
current_line_percentages: Percentage::zero(),
pending_whitespace: Length::zero(),
had_non_whitespace_content_yet: false,
linebreaker: None,