ladybird/Libraries/LibWeb/CSS/Resolution.cpp
Sam Atkins 443f9e5afb LibWeb/CSS: Make dimension types serialize in resolved form
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. :^)
2025-05-17 07:53:24 +01:00

68 lines
1.6 KiB
C++

/*
* Copyright (c) 2022-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2024, Glenn Skrzypczak <glenn.skrzypczak@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/Resolution.h>
namespace Web::CSS {
Resolution::Resolution(double value, Type type)
: m_type(type)
, m_value(value)
{
}
Resolution Resolution::make_dots_per_pixel(double value)
{
return { value, Type::Dppx };
}
String Resolution::to_string(SerializationMode serialization_mode) const
{
if (serialization_mode == SerializationMode::ResolvedValue)
return MUST(String::formatted("{}dppx", to_dots_per_pixel()));
return MUST(String::formatted("{}{}", raw_value(), unit_name()));
}
double Resolution::to_dots_per_pixel() const
{
switch (m_type) {
case Type::Dpi:
return m_value / 96; // 1in = 2.54cm = 96px
case Type::Dpcm:
return m_value / (96.0 / 2.54); // 1cm = 96px/2.54
case Type::Dppx:
return m_value;
}
VERIFY_NOT_REACHED();
}
StringView Resolution::unit_name() const
{
switch (m_type) {
case Type::Dpi:
return "dpi"sv;
case Type::Dpcm:
return "dpcm"sv;
case Type::Dppx:
return "dppx"sv;
}
VERIFY_NOT_REACHED();
}
Optional<Resolution::Type> Resolution::unit_from_name(StringView name)
{
if (name.equals_ignoring_ascii_case("dpi"sv)) {
return Type::Dpi;
} else if (name.equals_ignoring_ascii_case("dpcm"sv)) {
return Type::Dpcm;
} else if (name.equals_ignoring_ascii_case("dppx"sv) || name.equals_ignoring_ascii_case("x"sv)) {
return Type::Dppx;
}
return {};
}
}