1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef MINIKIN_FONT_FEATURE_H 18 #define MINIKIN_FONT_FEATURE_H 19 20 #include <hb.h> 21 22 #include <ostream> 23 #include <string_view> 24 #include <vector> 25 26 namespace minikin { 27 28 struct MinikinPaint; 29 30 // Subset of the hb_feature_t since we don't allow setting features on ranges. 31 struct FontFeature { 32 hb_tag_t tag; 33 uint32_t value; 34 35 static std::vector<FontFeature> parse(std::string_view fontFeatureString); 36 }; 37 38 /** 39 * Returns the final set of font features based on the features requested by this paint object and 40 * extra defaults or implied font features. 41 * 42 * Features are included from the paint object if they are: 43 * 1) in a supported range 44 * 45 * Default features are added based if they are: 46 * 1) implied due to Paint settings such as letterSpacing 47 * 2) default features that do not conflict with requested features 48 */ 49 std::vector<hb_feature_t> cleanAndAddDefaultFontFeatures(const MinikinPaint& features); 50 51 // For gtest output 52 inline std::ostream& operator<<(std::ostream& os, const FontFeature& feature) { 53 return os << static_cast<char>(feature.tag >> 24) << static_cast<char>(feature.tag >> 16) 54 << static_cast<char>(feature.tag >> 8) << static_cast<char>(feature.tag) << " " 55 << feature.value; 56 } 57 58 inline std::ostream& operator<<(std::ostream& os, const std::vector<FontFeature>& features) { 59 for (size_t i = 0; i < features.size(); ++i) { 60 if (i != 0) { 61 os << ", "; 62 } 63 os << features; 64 } 65 return os; 66 } 67 68 constexpr bool operator==(const FontFeature& l, const FontFeature& r) { 69 return l.tag == r.tag && l.value == r.value; 70 } 71 72 constexpr bool operator!=(const FontFeature& l, const FontFeature& r) { 73 return !(l == r); 74 } 75 76 } // namespace minikin 77 #endif // MINIKIN_LAYOUT_H 78