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LibWeb: Follow relaxed CSS clamping rules in flexbox layout

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AFAICT, css-values-4 tells us that clamping numbers to a range where
min>max is okay. That means we can't use AK::clamp() since it will
VERIFY that max>=min.

This patch adds a css_clamp() helper (locally in FFC for now).

This fixes an issue where a bunch of sites were crashing due to the
VERIFY in AK::clamp().
This commit is contained in:
Andreas Kling 2022-04-09 14:47:41 +02:00
parent f21eb90294
commit cc77c82383
1 changed files with 12 additions and 4 deletions
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16
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
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@ -18,6 +18,14 @@
namespace Web::Layout {
// NOTE: We use a custom clamping function here instead of AK::clamp(), since the AK version
// will VERIFY(max >= min) and CSS explicitly allows that (see css-values-4.)
template<typename T>
constexpr T css_clamp(T const& value, T const& min, T const& max)
{
return ::max(min, ::min(value, max));
}
static float get_pixel_size(FormattingState const& state, Box const& box, Optional<CSS::LengthPercentage> const& length_percentage)
{
if (!length_percentage.has_value())
@ -605,7 +613,7 @@ void FlexFormattingContext::determine_flex_base_size_and_hypothetical_main_size(
// The hypothetical main size is the item’s flex base size clamped according to its used min and max main sizes (and flooring the content box size at zero).
auto clamp_min = has_main_min_size(child_box) ? specified_main_min_size(child_box) : determine_min_main_size_of_child(child_box);
auto clamp_max = has_main_max_size(child_box) ? specified_main_max_size(child_box) : NumericLimits<float>::max();
flex_item.hypothetical_main_size = clamp(flex_item.flex_base_size, clamp_min, clamp_max);
flex_item.hypothetical_main_size = css_clamp(flex_item.flex_base_size, clamp_min, clamp_max);
}
float FlexFormattingContext::determine_min_main_size_of_child(Box const& box)
@ -651,7 +659,7 @@ void FlexFormattingContext::determine_main_size_of_flex_container(bool const mai
}
result += flex_item.flex_base_size + flex_item.margins.main_before + flex_item.margins.main_after + flex_item.borders.main_before + flex_item.borders.main_after + flex_item.padding.main_before + flex_item.padding.main_after + product;
}
m_available_space->main = clamp(result, main_min_size, main_max_size);
m_available_space->main = css_clamp(result, main_min_size, main_max_size);
}
set_main_size(flex_container(), m_available_space->main.value_or(NumericLimits<float>::max()));
}
@ -962,7 +970,7 @@ void FlexFormattingContext::calculate_cross_size_of_each_flex_line(float const c
// If the flex container is single-line, then clamp the line’s cross-size to be within the container’s computed min and max cross sizes.
// Note that if CSS 2.1’s definition of min/max-width/height applied more generally, this behavior would fall out automatically.
if (is_single_line())
clamp(m_flex_lines[0].cross_size, cross_min_size, cross_max_size);
css_clamp(m_flex_lines[0].cross_size, cross_min_size, cross_max_size);
}
// https://www.w3.org/TR/css-flexbox-1/#algo-stretch
@ -1117,7 +1125,7 @@ void FlexFormattingContext::determine_flex_container_used_cross_size(float const
cross_size = cross_size_value->resolved(flex_container(), CSS::Length::make_px(specified_cross_size(*flex_container().containing_block()))).to_px(flex_container());
}
}
set_cross_size(flex_container(), clamp(cross_size, cross_min_size, cross_max_size));
set_cross_size(flex_container(), css_clamp(cross_size, cross_min_size, cross_max_size));
}
// https://www.w3.org/TR/css-flexbox-1/#algo-line-align