freetypefontutils.h

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#ifndef ION_TEXT_FREETYPEFONTUTILS_H_
#define ION_TEXT_FREETYPEFONTUTILS_H_


#include <string>
#include <vector>

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

namespace ion {
namespace text {

class Font;
class FreeTypeFont;

struct TextSize {
  float line_height_in_pixels;
  math::Vector2f rect_size_in_pixels;
  float text_height_in_pixels;
  float first_line_above_baseline;
  std::vector<float> line_widths_in_pixels;
};

struct FreeTypeFontTransformData {
  math::Vector2f scale;
  std::vector<math::Vector2f> line_translations;
  float line_y_offset_in_pixels;
};

typedef std::vector<std::string> Lines;

const TextSize ComputeTextSize(const FreeTypeFont& font,
                               const LayoutOptions& options,
                               const Lines& lines);

const FreeTypeFontTransformData ComputeTransformData(
    const Font& font, const LayoutOptions& options, const TextSize& text_size);

const Layout LayOutText(const FreeTypeFont& font, bool use_icu,
                        const Lines& lines,
                        const FreeTypeFontTransformData& transform_data);

}  // namespace text
}  // namespace ion

#endif  // ION_TEXT_FREETYPEFONTUTILS_H_