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LibWeb/CSS: Make dimension types serialize in resolved form

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Some dimensions would always serialize in a canonical unit, others never
did, and others we manually would do so in their StyleValue. This
commit moves all of that into the dimension types, which means for
example that Length can apply its special rounding.

Our local serialization test now produces the same output as other
browsers. :^)
This commit is contained in:
Sam Atkins 2025-05-16 20:02:16 +01:00 • committed by Tim Ledbetter
commit 443f9e5afb
Notes: github-actions[bot] 2025-05-17 06:54:42 +00:00
20 changed files with 70 additions and 58 deletions
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8
Libraries/LibWeb/CSS/Length.cpp
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@ -1,7 +1,7 @@
/*
* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022-2025, Sam Atkins <sam@ladybird.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -198,10 +198,14 @@ CSSPixels Length::to_px_slow_case(Layout::Node const& layout_node) const
return viewport_relative_length_to_px(viewport_rect);
}
String Length::to_string() const
String Length::to_string(SerializationMode serialization_mode) const
{
if (is_auto())
return "auto"_string;
// FIXME: Manually skip this for px so we avoid rounding errors in absolute_length_to_px.
// Maybe provide alternative functions that don't produce CSSPixels?
if (serialization_mode == SerializationMode::ResolvedValue && is_absolute() && m_type != Type::Px)
return MUST(String::formatted("{:.5}px", absolute_length_to_px()));
return MUST(String::formatted("{:.5}{}", m_value, unit_name()));
}