glyph_metrics.hpp

// Copyright Take Vos 2019-2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../required.hpp"
#include "../geometry/axis_aligned_rectangle.hpp"
#include "../geometry/scale.hpp"
 
namespace tt {
 
struct glyph_metrics {
    aarectangle boundingBox = {};
 
    float leftSideBearing = 0.0f;
 
    float rightSideBearing = 0.0f;
 
    float ascender = 0.0f;
 
    float descender = 0.0f;
 
    float lineGap = 0.0f;
 
    float capHeight = 0.0f;
 
    float xHeight = 0.0f;
 
    vector2 advance = {0.0f, 0.0f};
 
    int numberOfgraphemes = 1;
 
    glyph_metrics() noexcept = default;
    glyph_metrics(glyph_metrics const &) noexcept = default;
    glyph_metrics(glyph_metrics &&) noexcept = default;
    glyph_metrics &operator=(glyph_metrics const &) noexcept = default;
    glyph_metrics &operator=(glyph_metrics &&) noexcept = default;
 
    vector2 advanceForgrapheme(int index) const noexcept {
        ttlet ligatureRatio = 1.0f / numberOfgraphemes;
 
        return advance * ligatureRatio * narrow_cast<float>(index);
    }
 
    glyph_metrics &scale(float rhs) noexcept
    {
        auto S = scale2(rhs);
 
        boundingBox = S * boundingBox;
        leftSideBearing *= rhs;
        rightSideBearing *= rhs;
        advance = S * advance;
        ascender *= rhs;
        descender *= rhs;
        lineGap *= rhs;
        capHeight *= rhs;
        xHeight *= rhs;
        return *this;
    }
};
 
 
 
}