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30dcbc306c
No tests unfortunately, because no CSS property we currently support accepts `<resolution>`.
66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
/*
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* Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Resolution.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() const
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{
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return MUST(String::formatted("{}dppx", to_dots_per_pixel()));
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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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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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}
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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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} else if (name.equals_ignoring_ascii_case("dpcm"sv)) {
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return Type::Dpcm;
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} else if (name.equals_ignoring_ascii_case("dppx"sv)) {
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return Type::Dppx;
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}
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return {};
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}
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}
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