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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MINIKIN_FONT_H
#define MINIKIN_FONT_H
#include <gtest/gtest_prod.h>
#include <atomic>
#include <memory>
#include <unordered_set>
#include "minikin/Buffer.h"
#include "minikin/FontStyle.h"
#include "minikin/FontVariation.h"
#include "minikin/HbUtils.h"
#include "minikin/LocaleList.h"
#include "minikin/Macros.h"
#include "minikin/MinikinFont.h"
namespace minikin {
class Font;
// attributes representing transforms (fake bold, fake italic) to match styles
class FontFakery {
public:
FontFakery() : mFakeBold(false), mFakeItalic(false) {}
FontFakery(bool fakeBold, bool fakeItalic) : mFakeBold(fakeBold), mFakeItalic(fakeItalic) {}
// TODO: want to support graded fake bolding
bool isFakeBold() { return mFakeBold; }
bool isFakeItalic() { return mFakeItalic; }
inline bool operator==(const FontFakery& o) const {
return mFakeBold == o.mFakeBold && mFakeItalic == o.mFakeItalic;
}
inline bool operator!=(const FontFakery& o) const { return !(*this == o); }
private:
bool mFakeBold;
bool mFakeItalic;
};
struct FakedFont {
inline bool operator==(const FakedFont& o) const {
return font == o.font && fakery == o.fakery;
}
inline bool operator!=(const FakedFont& o) const { return !(*this == o); }
// ownership is the enclosing FontCollection
// FakedFont will be stored in the LayoutCache. It is not a good idea too keep font instance
// even if the enclosing FontCollection, i.e. Typeface is GC-ed. The layout cache is only
// purged when it is overflown, thus intentionally keep only reference.
const std::shared_ptr<Font>& font;
FontFakery fakery;
};
// Represents a single font file.
class Font {
public:
class Builder {
public:
Builder(const std::shared_ptr<MinikinFont>& typeface) : mTypeface(typeface) {}
// Override the font style. If not called, info from OS/2 table is used.
Builder& setStyle(FontStyle style) {
mWeight = style.weight();
mSlant = style.slant();
mIsWeightSet = mIsSlantSet = true;
return *this;
}
// Override the font weight. If not called, info from OS/2 table is used.
Builder& setWeight(uint16_t weight) {
mWeight = weight;
mIsWeightSet = true;
return *this;
}
// Override the font slant. If not called, info from OS/2 table is used.
Builder& setSlant(FontStyle::Slant slant) {
mSlant = slant;
mIsSlantSet = true;
return *this;
}
Builder& setLocaleListId(uint32_t id) {
mLocaleListId = id;
return *this;
}
std::shared_ptr<Font> build();
private:
std::shared_ptr<MinikinFont> mTypeface;
uint16_t mWeight = static_cast<uint16_t>(FontStyle::Weight::NORMAL);
FontStyle::Slant mSlant = FontStyle::Slant::UPRIGHT;
uint32_t mLocaleListId = kEmptyLocaleListId;
bool mIsWeightSet = false;
bool mIsSlantSet = false;
};
explicit Font(BufferReader* reader);
void writeTo(BufferWriter* writer) const;
Font(Font&& o) noexcept;
Font& operator=(Font&& o) noexcept;
~Font();
// This locale list is just for API compatibility. This is not used in font selection or family
// fallback.
uint32_t getLocaleListId() const { return mLocaleListId; }
const std::shared_ptr<MinikinFont>& typeface() const;
inline FontStyle style() const { return mStyle; }
const HbFontUniquePtr& baseFont() const;
BufferReader typefaceMetadataReader() const { return mTypefaceMetadataReader; }
std::unordered_set<AxisTag> getSupportedAxes() const;
private:
// ExternalRefs holds references to objects provided by external libraries.
// Because creating these external objects is costly,
// ExternalRefs is lazily created if Font was created by readFrom().
class ExternalRefs {
public:
ExternalRefs(std::shared_ptr<MinikinFont>&& typeface, HbFontUniquePtr&& baseFont)
: mTypeface(std::move(typeface)), mBaseFont(std::move(baseFont)) {}
std::shared_ptr<MinikinFont> mTypeface;
HbFontUniquePtr mBaseFont;
};
// Use Builder instead.
Font(std::shared_ptr<MinikinFont>&& typeface, FontStyle style, HbFontUniquePtr&& baseFont,
uint32_t localeListId)
: mExternalRefsHolder(new ExternalRefs(std::move(typeface), std::move(baseFont))),
mStyle(style),
mLocaleListId(localeListId),
mTypefaceMetadataReader(nullptr) {}
void resetExternalRefs(ExternalRefs* refs);
const ExternalRefs* getExternalRefs() const;
static HbFontUniquePtr prepareFont(const std::shared_ptr<MinikinFont>& typeface);
static FontStyle analyzeStyle(const HbFontUniquePtr& font);
// Lazy-initialized if created by readFrom().
mutable std::atomic<ExternalRefs*> mExternalRefsHolder;
FontStyle mStyle;
uint32_t mLocaleListId;
// Non-null if created by readFrom().
BufferReader mTypefaceMetadataReader;
// Stop copying.
Font(const Font& o) = delete;
Font& operator=(const Font& o) = delete;
FRIEND_TEST(FontTest, MoveConstructorTest);
FRIEND_TEST(FontTest, MoveAssignmentTest);
};
} // namespace minikin
#endif // MINIKIN_FONT_H
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