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/*
* Copyright (C) 2018-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FontMetrics.h"
#include "Length.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
class TextDecorationThickness {
public:
static TextDecorationThickness createWithAuto()
{
return TextDecorationThickness(Type::Auto);
}
static TextDecorationThickness createFromFont()
{
return TextDecorationThickness(Type::FromFont);
}
static TextDecorationThickness createWithLength(float length)
{
TextDecorationThickness result(Type::Length);
result.setLengthValue(length);
return result;
}
bool isAuto() const
{
return m_type == Type::Auto;
}
bool isFromFont() const
{
return m_type == Type::FromFont;
}
bool isLength() const
{
return m_type == Type::Length;
}
void setLengthValue(float length)
{
ASSERT(isLength());
m_length = length;
}
float lengthValue() const
{
ASSERT(isLength());
return m_length;
}
float resolve(float fontSize, const FontMetrics& metrics) const
{
if (isAuto()) {
const float textDecorationBaseFontSize = 16;
return fontSize / textDecorationBaseFontSize;
}
if (isFromFont())
return metrics.underlineThickness();
ASSERT(isLength());
return m_length;
}
bool operator==(const TextDecorationThickness& other) const
{
switch (m_type) {
case Type::Auto:
case Type::FromFont:
return m_type == other.m_type;
case Type::Length:
return m_type == other.m_type && m_length == other.m_length;
default:
ASSERT_NOT_REACHED();
return true;
}
}
bool operator!=(const TextDecorationThickness& other) const
{
return !(*this == other);
}
private:
enum class Type : uint8_t {
Auto,
FromFont,
Length
};
TextDecorationThickness(Type type)
: m_type { type }
{
}
Type m_type;
float m_length { 0 };
};
inline TextStream& operator<<(TextStream& ts, const TextDecorationThickness& thickness)
{
if (thickness.isAuto())
ts << "auto";
else if (thickness.isFromFont())
ts << "from-font";
else
ts << TextStream::FormatNumberRespectingIntegers(thickness.lengthValue());
return ts;
}
} // namespace WebCore