freetypefont.h

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#ifndef ION_TEXT_FREETYPEFONT_H_
#define ION_TEXT_FREETYPEFONT_H_

#include <memory>
#include <string>

#include "ion/math/vector.h"
#include "ion/text/font.h"

#if defined(ION_USE_ICU)
#include "third_party/iculx_hb/include/layout/ParagraphLayout.h"
#endif  // ION_USE_ICU

namespace ion {
namespace text {

class ION_API FreeTypeFont : public Font {
 public:
  struct GlyphMetrics {
    GlyphMetrics()
        : size(0.f, 0.f), bitmap_offset(0.f, 0.f), advance(0.f, 0.f) {}

    bool IsZeroSize() const { return size[0] == 0.0f || size[1] == 0.0f; }

    math::Vector2f size;

    math::Vector2f bitmap_offset;

    math::Vector2f advance;
  };

  FreeTypeFont(const std::string& name, size_t size_in_pixels,
               size_t sdf_padding, const void* data, size_t data_size);

  const GlyphMetrics& GetGlyphMetrics(GlyphIndex glyph_index) const;

  const math::Vector2f GetKerning(CharIndex char_index0,
                                  CharIndex char_index1) const;

#if defined(ION_USE_ICU)
  void GetFontRunsForText(icu::UnicodeString chars,
                          iculx::FontRuns* runs) const;
  GlyphIndex GlyphIndexForICUFont(const icu::LEFontInstance* icu_font,
                                  int32 glyph_id) const;
#endif  // ION_USE_ICU

  GlyphIndex GetDefaultGlyphForChar(CharIndex char_index) const override;
  const Layout BuildLayout(const std::string& text,
                           const LayoutOptions& options) const override;
  void AddFallbackFont(const FontPtr& fallback) override;

 protected:
  FreeTypeFont(const std::string& name, size_t size_in_pixels,
               size_t sdf_padding);

  ~FreeTypeFont() override;

  bool LoadGlyphGrid(GlyphIndex glyph_index,
                     GlyphGrid* glyph_grid) const override;

 private:
  class Helper;
  std::shared_ptr<Helper> helper_;
};

typedef base::ReferentPtr<FreeTypeFont>::Type FreeTypeFontPtr;

}  // namespace text
}  // namespace ion

#endif  // ION_TEXT_FREETYPEFONT_H_