1 files changed, 77 insertions, 0 deletions
diff --git a/include/minikin/FontFeature.h b/include/minikin/FontFeature.h
new file mode 100644
index 0000000..c47594b
--- /dev/null
+++ b/include/minikin/FontFeature.h
@@ -0,0 +1,77 @@
+/*
+ * 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