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/*
* Copyright (C) 2021 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_FEATURE_H
#define MINIKIN_FONT_FEATURE_H
#include <hb.h>
#include <ostream>
#include <string_view>
#include <vector>
namespace minikin {
struct MinikinPaint;
// Subset of the hb_feature_t since we don't allow setting features on ranges.
struct FontFeature {
hb_tag_t tag;
uint32_t value;
static std::vector<FontFeature> parse(std::string_view fontFeatureString);
};
/**
* Returns the final set of font features based on the features requested by this paint object and
* extra defaults or implied font features.
*
* Features are included from the paint object if they are:
* 1) in a supported range
*
* Default features are added based if they are:
* 1) implied due to Paint settings such as letterSpacing
* 2) default features that do not conflict with requested features
*/
std::vector<hb_feature_t> cleanAndAddDefaultFontFeatures(const MinikinPaint& features);
// For gtest output
inline std::ostream& operator<<(std::ostream& os, const FontFeature& feature) {
return os << static_cast<char>(feature.tag >> 24) << static_cast<char>(feature.tag >> 16)
<< static_cast<char>(feature.tag >> 8) << static_cast<char>(feature.tag) << " "
<< feature.value;
}
inline std::ostream& operator<<(std::ostream& os, const std::vector<FontFeature>& features) {
for (size_t i = 0; i < features.size(); ++i) {
if (i != 0) {
os << ", ";
}
os << features;
}
return os;
}
constexpr bool operator==(const FontFeature& l, const FontFeature& r) {
return l.tag == r.tag && l.value == r.value;
}
constexpr bool operator!=(const FontFeature& l, const FontFeature& r) {
return !(l == r);
}
} // namespace minikin
#endif // MINIKIN_LAYOUT_H
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