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67 lines
1.3 KiB
C++
67 lines
1.3 KiB
C++
/*
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* Copyright (c) 2022, 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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#include <LibWeb/CSS/StyleValue.h>
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namespace Web::CSS {
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Resolution::Resolution(int 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(float 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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String Resolution::to_string() const
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{
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return String::formatted("{}{}", m_value, unit_name());
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}
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float 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 * (96.0f / 2.54f); // 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_case("dpi"sv)) {
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return Type::Dpi;
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} else if (name.equals_ignoring_case("dpcm"sv)) {
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return Type::Dpcm;
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} else if (name.equals_ignoring_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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