Repo created

libs/drape/harfbuzz_shaping.hpp

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+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <hb.h>
+
+namespace harfbuzz_shaping
+{
+struct TextSegment
+{
+  // TODO(AB): Use 1 byte or 2 bytes for memory-efficient caching.
+  int32_t m_start;  // Offset to the segment start in the string.
+  int32_t m_length;
+  hb_script_t m_script;
+  hb_direction_t m_direction;
+
+  TextSegment(int32_t start, int32_t length, hb_script_t script, hb_direction_t direction)
+    : m_start(start)
+    , m_length(length)
+    , m_script(script)
+    , m_direction(direction)
+  {}
+};
+
+struct TextSegments
+{
+  std::u16string m_text;
+  std::vector<TextSegment> m_segments;
+  // TODO(AB): Reverse indexes to order segments instead of moving them.
+  // std::vector<size_t> m_segmentsOrder;
+};
+
+// Finds segments with common properties suitable for harfbuzz in a single line of text without newlines.
+// Any line breaking/trimming should be done by the caller.
+TextSegments GetTextSegments(std::string_view utf8);
+
+std::string DebugPrint(TextSegment const & segment);
+}  // namespace harfbuzz_shaping