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LibWeb: Implement CSS Resolution class

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This corresponds to `<resolution>` in the grammar.
This commit is contained in:
Sam Atkins 2022-02-21 17:51:01 +00:00 • committed by Andreas Kling
parent bd79c303f6
commit 0465abcfec
7 changed files with 160 additions and 0 deletions
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67
Userland/Libraries/LibWeb/CSS/Resolution.cpp Normal file
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/*
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Resolution.h"
#include <LibWeb/CSS/StyleValue.h>
namespace Web::CSS {
Resolution::Resolution(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Resolution::Resolution(float value, Type type)
: m_type(type)
, m_value(value)
{
}
String Resolution::to_string() const
{
return String::formatted("{}{}", m_value, unit_name());
}
float 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 * (96.0f / 2.54f); // 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_case("dpi"sv)) {
return Type::Dpi;
} else if (name.equals_ignoring_case("dpcm"sv)) {
return Type::Dpcm;
} else if (name.equals_ignoring_case("dppx"sv)) {
return Type::Dppx;
}
return {};
}
}