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682e080d57
As noted, the spec tells us to do something different than what is expected by WPT, so we slightly ignore it.
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
/*
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* Copyright (c) 2022-2025, Sam Atkins <sam@ladybird.org>
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* Copyright (c) 2024, Glenn Skrzypczak <glenn.skrzypczak@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/Resolution.h>
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#include <LibWeb/CSS/Serialize.h>
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namespace Web::CSS {
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Resolution::Resolution(double value, Type type)
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: m_type(type)
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, m_value(value)
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{
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}
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Resolution Resolution::make_dots_per_pixel(double value)
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{
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return { value, Type::Dppx };
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}
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String Resolution::to_string(SerializationMode serialization_mode) const
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{
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// https://drafts.csswg.org/cssom/#serialize-a-css-value
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// -> <resolution>
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// The resolution in dots per CSS pixel serialized as per <number> followed by the literal string "dppx".
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// AD-HOC: WPT expects us to serialize using the actual unit, like for other dimensions.
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// https://github.com/w3c/csswg-drafts/issues/12616
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if (serialization_mode == SerializationMode::ResolvedValue) {
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StringBuilder builder;
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serialize_a_number(builder, to_dots_per_pixel());
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builder.append("dppx"sv);
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return builder.to_string_without_validation();
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}
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StringBuilder builder;
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serialize_a_number(builder, raw_value());
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builder.append(unit_name());
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return builder.to_string_without_validation();
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}
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double Resolution::to_dots_per_pixel() const
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{
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switch (m_type) {
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case Type::Dpi:
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return m_value / 96; // 1in = 2.54cm = 96px
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case Type::Dpcm:
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return m_value / (96.0 / 2.54); // 1cm = 96px/2.54
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case Type::Dppx:
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case Type::X:
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return m_value;
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}
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VERIFY_NOT_REACHED();
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}
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StringView Resolution::unit_name() const
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{
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switch (m_type) {
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case Type::Dpi:
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return "dpi"sv;
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case Type::Dpcm:
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return "dpcm"sv;
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case Type::Dppx:
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return "dppx"sv;
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case Type::X:
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return "x"sv;
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}
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VERIFY_NOT_REACHED();
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}
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Optional<Resolution::Type> Resolution::unit_from_name(StringView name)
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{
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if (name.equals_ignoring_ascii_case("dpi"sv))
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return Type::Dpi;
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if (name.equals_ignoring_ascii_case("dpcm"sv))
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return Type::Dpcm;
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if (name.equals_ignoring_ascii_case("dppx"sv))
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return Type::Dppx;
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if (name.equals_ignoring_ascii_case("x"sv))
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return Type::X;
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return {};
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}
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}
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