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/*
* Copyright (C) 2023 ChangSeok Oh <changseok@webkit.org>
*
* 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 <variant>
#include <wtf/Markable.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
struct FontSizeAdjust {
friend bool operator==(const FontSizeAdjust&, const FontSizeAdjust&) = default;
enum class ValueType : bool { Number, FromFont };
enum class Metric : uint8_t {
ExHeight,
CapHeight,
ChWidth,
IcWidth,
IcHeight
};
std::optional<float> resolve(float computedSize, const FontMetrics& fontMetrics) const
{
std::optional<float> metricValue;
switch (metric) {
case FontSizeAdjust::Metric::CapHeight:
metricValue = fontMetrics.capHeight();
break;
case FontSizeAdjust::Metric::ChWidth:
metricValue = fontMetrics.zeroWidth();
break;
// FIXME: Are ic-height and ic-width the same? Gecko treats them the same.
case FontSizeAdjust::Metric::IcWidth:
case FontSizeAdjust::Metric::IcHeight:
metricValue = fontMetrics.ideogramWidth();
break;
case FontSizeAdjust::Metric::ExHeight:
default:
metricValue = fontMetrics.xHeight();
}
return metricValue.has_value() && computedSize
? std::make_optional(*metricValue / computedSize)
: std::nullopt;
}
bool isNone() const { return !value && type != ValueType::FromFont; }
bool isFromFont() const { return type == ValueType::FromFont; }
bool shouldResolveFromFont() const { return isFromFont() && !value; }
Metric metric { Metric::ExHeight };
ValueType type { ValueType::Number };
Markable<float, WTF::FloatMarkableTraits> value { };
};
inline void add(Hasher& hasher, const FontSizeAdjust& fontSizeAdjust)
{
add(hasher, fontSizeAdjust.metric, fontSizeAdjust.type, fontSizeAdjust.value.unsafeValue());
}
inline TextStream& operator<<(TextStream& ts, const FontSizeAdjust& fontSizeAdjust)
{
switch (fontSizeAdjust.metric) {
case FontSizeAdjust::Metric::CapHeight:
ts << "cap-height";
break;
case FontSizeAdjust::Metric::ChWidth:
ts << "ch-width";
break;
case FontSizeAdjust::Metric::IcWidth:
ts << "ic-width";
break;
case FontSizeAdjust::Metric::IcHeight:
ts << "ic-height";
break;
case FontSizeAdjust::Metric::ExHeight:
default:
if (fontSizeAdjust.isFromFont())
return ts << "from-font";
return ts << *fontSizeAdjust.value;
}
if (fontSizeAdjust.isFromFont())
return ts << " " << "from-font";
return ts << " " << *fontSizeAdjust.value;
}
}
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