| /* |
| * 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 <vector> |
| #include <string> |
| |
| #include <utils/TypeHelpers.h> |
| |
| #include <minikin/MinikinRefCounted.h> |
| #include <minikin/SparseBitSet.h> |
| |
| namespace android { |
| |
| class MinikinFont; |
| |
| // FontLanguage is a compact representation of a bcp-47 language tag. It |
| // does not capture all possible information, only what directly affects |
| // font rendering. |
| class FontLanguage { |
| friend class FontStyle; |
| public: |
| FontLanguage() : mBits(0) { } |
| |
| // Parse from string |
| FontLanguage(const char* buf, size_t size); |
| |
| bool operator==(const FontLanguage other) const { return mBits == other.mBits; } |
| operator bool() const { return mBits != 0; } |
| |
| std::string getString() const; |
| |
| // 0 = no match, 1 = language matches, 2 = language and script match |
| int match(const FontLanguage other) const; |
| |
| private: |
| explicit FontLanguage(uint32_t bits) : mBits(bits) { } |
| |
| uint32_t bits() const { return mBits; } |
| |
| static const uint32_t kBaseLangMask = 0xffff; |
| static const uint32_t kScriptMask = (1 << 18) - (1 << 16); |
| static const uint32_t kHansFlag = 1 << 16; |
| static const uint32_t kHantFlag = 1 << 17; |
| uint32_t mBits; |
| }; |
| |
| // FontStyle represents all style information needed to select an actual font |
| // from a collection. The implementation is packed into a single 32-bit word |
| // so it can be efficiently copied, embedded in other objects, etc. |
| class FontStyle { |
| public: |
| FontStyle(int weight = 4, bool italic = false) { |
| bits = (weight & kWeightMask) | (italic ? kItalicMask : 0); |
| } |
| FontStyle(FontLanguage lang, int variant = 0, int weight = 4, bool italic = false) { |
| bits = (weight & kWeightMask) | (italic ? kItalicMask : 0) |
| | (variant << kVariantShift) | (lang.bits() << kLangShift); |
| } |
| int getWeight() const { return bits & kWeightMask; } |
| bool getItalic() const { return (bits & kItalicMask) != 0; } |
| int getVariant() const { return (bits >> kVariantShift) & kVariantMask; } |
| FontLanguage getLanguage() const { return FontLanguage(bits >> kLangShift); } |
| |
| bool operator==(const FontStyle other) const { return bits == other.bits; } |
| |
| hash_t hash() const { return bits; } |
| private: |
| static const uint32_t kWeightMask = (1 << 4) - 1; |
| static const uint32_t kItalicMask = 1 << 4; |
| static const int kVariantShift = 5; |
| static const uint32_t kVariantMask = (1 << 2) - 1; |
| static const int kLangShift = 7; |
| uint32_t bits; |
| }; |
| |
| enum FontVariant { |
| VARIANT_DEFAULT = 0, |
| VARIANT_COMPACT = 1, |
| VARIANT_ELEGANT = 2, |
| }; |
| |
| inline hash_t hash_type(const FontStyle &style) { |
| return style.hash(); |
| } |
| |
| // 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; } |
| private: |
| bool mFakeBold; |
| bool mFakeItalic; |
| }; |
| |
| struct FakedFont { |
| // ownership is the enclosing FontCollection |
| MinikinFont* font; |
| FontFakery fakery; |
| }; |
| |
| class FontFamily : public MinikinRefCounted { |
| public: |
| FontFamily() { } |
| |
| FontFamily(FontLanguage lang, int variant) : mLang(lang), mVariant(variant) { |
| } |
| |
| ~FontFamily(); |
| |
| // Add font to family, extracting style information from the font |
| bool addFont(MinikinFont* typeface); |
| |
| void addFont(MinikinFont* typeface, FontStyle style); |
| FakedFont getClosestMatch(FontStyle style) const; |
| |
| FontLanguage lang() const { return mLang; } |
| int variant() const { return mVariant; } |
| |
| // API's for enumerating the fonts in a family. These don't guarantee any particular order |
| size_t getNumFonts() const; |
| MinikinFont* getFont(size_t index) const; |
| FontStyle getStyle(size_t index) const; |
| |
| // Get Unicode coverage. Lifetime of returned bitset is same as receiver. |
| const SparseBitSet* getCoverage(); |
| private: |
| void addFontLocked(MinikinFont* typeface, FontStyle style); |
| |
| class Font { |
| public: |
| Font(MinikinFont* typeface, FontStyle style) : |
| typeface(typeface), style(style) { } |
| MinikinFont* typeface; |
| FontStyle style; |
| }; |
| FontLanguage mLang; |
| int mVariant; |
| std::vector<Font> mFonts; |
| |
| SparseBitSet mCoverage; |
| bool mCoverageValid; |
| }; |
| |
| } // namespace android |
| |
| #endif // MINIKIN_FONT_FAMILY_H |