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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* font specific types shared by both thebes and layout */
#ifndef GFX_FONT_PROPERTY_TYPES_H
#define GFX_FONT_PROPERTY_TYPES_H
#include <algorithm>
#include <cstdint>
#include <cmath>
#include <utility>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "mozilla/Assertions.h"
#include "mozilla/ServoStyleConsts.h"
#include "nsString.h"
/*
* This file is separate from gfxFont.h so that layout can include it
* without bringing in gfxFont.h and everything it includes.
*/
namespace mozilla {
using FontSlantStyle = StyleFontStyle;
using FontWeight = StyleFontWeight;
using FontStretch = StyleFontStretch;
/**
* Convenience type to hold a <min, max> pair representing a range of values.
*
* The min and max are both inclusive, so when min == max the range represents
* a single value (not an empty range).
*/
template <class T, class Derived>
class FontPropertyRange {
// This implementation assumes the underlying property type is a 16-bit value
// (see FromScalar and AsScalar below).
static_assert(sizeof(T) == 2, "FontPropertyValue should be a 16-bit type!");
public:
/**
* Construct a range from given minimum and maximum values (inclusive).
*/
FontPropertyRange(T aMin, T aMax) : mValues(aMin, aMax) {
MOZ_ASSERT(aMin <= aMax);
}
/**
* Construct a range representing a single value (min==max).
*/
explicit FontPropertyRange(T aValue) : mValues(aValue, aValue) {}
explicit FontPropertyRange(const FontPropertyRange& aOther) = default;
FontPropertyRange& operator=(const FontPropertyRange& aOther) = default;
T Min() const { return mValues.first; }
T Max() const { return mValues.second; }
/**
* Clamp the given value to this range.
*
* (We can't use mozilla::Clamp here because it only accepts integral types.)
*/
T Clamp(T aValue) const {
return aValue <= Min() ? Min() : (aValue >= Max() ? Max() : aValue);
}
/**
* Return whether the range consists of a single unique value.
*/
bool IsSingle() const { return Min() == Max(); }
bool operator==(const FontPropertyRange& aOther) const {
return mValues == aOther.mValues;
}
bool operator!=(const FontPropertyRange& aOther) const {
return mValues != aOther.mValues;
}
/**
* Conversion of the property range to/from a single 32-bit scalar value,
* suitable for IPC serialization, hashing, caching.
*
* No assumptions should be made about the numeric value of the scalar.
*
* This depends on the underlying property type being a 16-bit value!
*/
using ScalarType = uint32_t;
ScalarType AsScalar() const {
return (mValues.first.UnsignedRaw() << 16) | mValues.second.UnsignedRaw();
}
static Derived FromScalar(ScalarType aScalar) {
static_assert(std::is_base_of_v<FontPropertyRange, Derived>);
return Derived(T::FromRaw(aScalar >> 16), T::FromRaw(aScalar & 0xffff));
}
protected:
std::pair<T, T> mValues;
};
class WeightRange : public FontPropertyRange<FontWeight, WeightRange> {
public:
WeightRange(FontWeight aMin, FontWeight aMax)
: FontPropertyRange(aMin, aMax) {}
explicit WeightRange(FontWeight aWeight) : FontPropertyRange(aWeight) {}
WeightRange(const WeightRange& aOther) = default;
void ToString(nsACString& aOutString, const char* aDelim = "..") const {
aOutString.AppendFloat(Min().ToFloat());
if (!IsSingle()) {
aOutString.Append(aDelim);
aOutString.AppendFloat(Max().ToFloat());
}
}
};
class StretchRange : public FontPropertyRange<FontStretch, StretchRange> {
public:
StretchRange(FontStretch aMin, FontStretch aMax)
: FontPropertyRange(aMin, aMax) {}
explicit StretchRange(FontStretch aStretch) : FontPropertyRange(aStretch) {}
StretchRange(const StretchRange& aOther) = default;
void ToString(nsACString& aOutString, const char* aDelim = "..") const {
aOutString.AppendFloat(Min().ToFloat());
if (!IsSingle()) {
aOutString.Append(aDelim);
aOutString.AppendFloat(Max().ToFloat());
}
}
};
class SlantStyleRange
: public FontPropertyRange<FontSlantStyle, SlantStyleRange> {
public:
SlantStyleRange(FontSlantStyle aMin, FontSlantStyle aMax)
: FontPropertyRange(aMin, aMax) {}
explicit SlantStyleRange(FontSlantStyle aStyle) : FontPropertyRange(aStyle) {}
SlantStyleRange(const SlantStyleRange& aOther) = default;
void ToString(nsACString& aOutString, const char* aDelim = "..") const {
Min().ToString(aOutString);
if (!IsSingle()) {
aOutString.Append(aDelim);
Max().ToString(aOutString);
}
}
};
} // namespace mozilla
#endif // GFX_FONT_PROPERTY_TYPES_H
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