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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/String.h>
#include <LibWeb/Forward.h>
namespace Web::CSS {
class Length {
public:
enum class Type {
Undefined,
Percentage,
Auto,
Cm,
In,
Mm,
Q,
Px,
Pt,
Pc,
Ex,
Em,
Rem,
Vh,
Vw,
Vmax,
Vmin,
};
Length() { }
Length(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Length(float value, Type type)
: m_type(type)
, m_value(value)
{
}
static Length make_auto() { return Length(0, Type::Auto); }
static Length make_px(float value) { return Length(value, Type::Px); }
Length resolved(const Length& fallback_for_undefined, const Layout::Node& layout_node, float reference_for_percent) const
{
if (is_undefined())
return fallback_for_undefined;
if (is_percentage())
return make_px(raw_value() / 100.0f * reference_for_percent);
if (is_relative())
return make_px(to_px(layout_node));
return *this;
}
Length resolved_or_auto(const Layout::Node& layout_node, float reference_for_percent) const
{
return resolved(make_auto(), layout_node, reference_for_percent);
}
Length resolved_or_zero(const Layout::Node& layout_node, float reference_for_percent) const
{
return resolved(make_px(0), layout_node, reference_for_percent);
}
bool is_undefined_or_auto() const { return m_type == Type::Undefined || m_type == Type::Auto; }
bool is_undefined() const { return m_type == Type::Undefined; }
bool is_percentage() const { return m_type == Type::Percentage; }
bool is_auto() const { return m_type == Type::Auto; }
bool is_absolute() const
{
return m_type == Type::Cm
|| m_type == Type::In
|| m_type == Type::Mm
|| m_type == Type::Px
|| m_type == Type::Pt
|| m_type == Type::Pc
|| m_type == Type::Q;
}
bool is_relative() const
{
return m_type == Type::Ex
|| m_type == Type::Em
|| m_type == Type::Rem
|| m_type == Type::Vh
|| m_type == Type::Vw
|| m_type == Type::Vmax
|| m_type == Type::Vmin;
}
float raw_value() const { return m_value; }
ALWAYS_INLINE float to_px(const Layout::Node& layout_node) const
{
if (is_relative())
return relative_length_to_px(layout_node);
constexpr float inch_pixels = 96.0f;
constexpr float centimeter_pixels = (inch_pixels / 2.54f);
switch (m_type) {
case Type::Auto:
return 0;
case Type::Cm:
return m_value * centimeter_pixels; // 1cm = 96px/2.54
case Type::In:
return m_value * inch_pixels; // 1in = 2.54 cm = 96px
case Type::Px:
return m_value; // 1px = 1/96th of 1in
case Type::Pt:
return m_value * ((1.0f / 72.0f) * inch_pixels); // 1pt = 1/72th of 1in
case Type::Pc:
return m_value * ((1.0f / 6.0f) * inch_pixels); // 1pc = 1/6th of 1in
case Type::Mm:
return m_value * ((1.0f / 10.0f) * centimeter_pixels); // 1mm = 1/10th of 1cm
case Type::Q:
return m_value * ((1.0f / 40.0f) * centimeter_pixels); // 1Q = 1/40th of 1cm
case Type::Undefined:
case Type::Percentage:
default:
VERIFY_NOT_REACHED();
}
}
String to_string() const
{
if (is_auto())
return "[auto]";
return String::formatted("[{} {}]", m_value, unit_name());
}
bool operator==(const Length& other) const
{
return m_type == other.m_type && m_value == other.m_value;
}
bool operator!=(const Length& other) const
{
return !(*this == other);
}
private:
float relative_length_to_px(const Layout::Node&) const;
const char* unit_name() const;
Type m_type { Type::Undefined };
float m_value { 0 };
};
}
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