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/*
* Copyright (C) 2013 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_FAMILY_H
#define MINIKIN_FONT_FAMILY_H
#include <memory>
#include <string>
#include <vector>
#include "minikin/FamilyVariant.h"
#include "minikin/Font.h"
#include "minikin/FontStyle.h"
#include "minikin/HbUtils.h"
#include "minikin/Macros.h"
#include "minikin/SparseBitSet.h"
namespace minikin {
class FontFamily {
public:
static std::shared_ptr<FontFamily> create(std::vector<std::shared_ptr<Font>>&& fonts);
static std::shared_ptr<FontFamily> create(FamilyVariant variant,
std::vector<std::shared_ptr<Font>>&& fonts);
static std::shared_ptr<FontFamily> create(uint32_t localeListId, FamilyVariant variant,
std::vector<std::shared_ptr<Font>>&& fonts,
bool isCustomFallback, bool isDefaultFallback);
FontFamily(FontFamily&&) = default;
FontFamily& operator=(FontFamily&&) = default;
static std::vector<std::shared_ptr<FontFamily>> readVector(BufferReader* reader);
static void writeVector(BufferWriter* writer,
const std::vector<std::shared_ptr<FontFamily>>& families);
FakedFont getClosestMatch(FontStyle style) const;
uint32_t localeListId() const { return mLocaleListId; }
FamilyVariant variant() const { return mVariant; }
// API's for enumerating the fonts in a family. These don't guarantee any particular order
size_t getNumFonts() const { return mFontsCount; }
const Font* getFont(size_t index) const { return mFonts[index].get(); }
const std::shared_ptr<Font>& getFontRef(size_t index) const { return mFonts[index]; }
FontStyle getStyle(size_t index) const { return mFonts[index]->style(); }
bool isColorEmojiFamily() const { return mIsColorEmoji; }
size_t getSupportedAxesCount() const { return mSupportedAxesCount; }
AxisTag getSupportedAxisAt(size_t index) const { return mSupportedAxes[index]; }
bool isCustomFallback() const { return mIsCustomFallback; }
bool isDefaultFallback() const { return mIsDefaultFallback; }
// Get Unicode coverage.
const SparseBitSet& getCoverage() const { return mCoverage; }
// Returns true if the font has a glyph for the code point and variation selector pair.
// Caller should acquire a lock before calling the method.
bool hasGlyph(uint32_t codepoint, uint32_t variationSelector) const;
// Returns true if this font family has a variaion sequence table (cmap format 14 subtable).
bool hasVSTable() const { return mCmapFmt14CoverageCount != 0; }
// Creates new FontFamily based on this family while applying font variations. Returns nullptr
// if none of variations apply to this family.
std::shared_ptr<FontFamily> createFamilyWithVariation(
const std::vector<FontVariation>& variations) const;
private:
FontFamily(uint32_t localeListId, FamilyVariant variant,
std::vector<std::shared_ptr<Font>>&& fonts, bool isCustomFallback,
bool isDefaultFallback);
explicit FontFamily(BufferReader* reader, const std::shared_ptr<std::vector<Font>>& fonts);
void writeTo(BufferWriter* writer, uint32_t* fontIndex) const;
void computeCoverage();
// Note: to minimize padding, small member fields are grouped at the end.
std::unique_ptr<std::shared_ptr<Font>[]> mFonts;
// mSupportedAxes is sorted.
std::unique_ptr<AxisTag[]> mSupportedAxes;
SparseBitSet mCoverage;
std::unique_ptr<SparseBitSet[]> mCmapFmt14Coverage;
uint32_t mLocaleListId; // 4 bytes
uint32_t mFontsCount; // 4 bytes
// OpenType supports up to 2^16-1 (uint16) axes.
// https://docs.microsoft.com/en-us/typography/opentype/spec/fvar
uint16_t mSupportedAxesCount; // 2 bytes
uint16_t mCmapFmt14CoverageCount; // 2 bytes
FamilyVariant mVariant; // 1 byte
bool mIsColorEmoji; // 1 byte
bool mIsCustomFallback; // 1 byte
bool mIsDefaultFallback; // 1 byte
MINIKIN_PREVENT_COPY_AND_ASSIGN(FontFamily);
};
} // namespace minikin
#endif // MINIKIN_FONT_FAMILY_H
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