writing_mode.hpp

[詳解]

#ifndef TYPESET_WRITING_MODE_HPP
#define TYPESET_WRITING_MODE_HPP
 
#include "typeset/geom.hpp"
 
namespace typeset {
 
enum class WritingMode : uint8_t {
    HorizontalTb,   
    VerticalRl,     
    VerticalLr,     
};
 
inline bool isVertical(WritingMode wm) { return wm != WritingMode::HorizontalTb; }
 
enum class TextOrientation : uint8_t {
    Mixed,      
    Upright,    
    Sideways,   
};
 
struct LogicalPoint {
    Pt inline_ = 0.0f;
    Pt block = 0.0f;
};
 
inline Point toPhysical(WritingMode wm, LogicalPoint p, Point lineOrigin) {
    if (wm == WritingMode::HorizontalTb) {
        return Point{lineOrigin.x + p.inline_, lineOrigin.y + p.block};
    }
    // 縦組み: inline は下へ、block は右へ（rl / lr で共通。列の送りは上位層）
    return Point{lineOrigin.x + p.block, lineOrigin.y + p.inline_};
}
 
inline LogicalPoint toLogical(WritingMode wm, Point p, Point lineOrigin) {
    if (wm == WritingMode::HorizontalTb) {
        return LogicalPoint{p.x - lineOrigin.x, p.y - lineOrigin.y};
    }
    return LogicalPoint{p.y - lineOrigin.y, p.x - lineOrigin.x};
}
 
inline constexpr float kSidewaysRotation = -1.5707963267948966f;   // -90°
 
} // namespace typeset
 
#endif // TYPESET_WRITING_MODE_HPP