border_style.hpp

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// CSS border line styles, as painted by View.
#pragma once
 
#include <pulp/view/view.hpp>
 
#include <optional>
#include <string_view>
 
namespace pulp::view {

std::optional<View::BorderStyle> border_style_from_css(std::string_view keyword);

struct BorderShades {
    Color light;
    Color dark;
};
BorderShades border_shades(Color side_color);

enum class BorderEdge { top, right, bottom, left };

struct BorderBands {
    float outer = 0.0f;
    float gap = 0.0f;
    float inner = 0.0f;
};
BorderBands border_bands(View::BorderStyle style, BorderEdge side, float width);

Color border_band_color(View::BorderStyle style, BorderEdge side, bool outer_band, Color side_color,
                        float width);

bool is_banded_border_style(View::BorderStyle style);

struct CornerRadii {
    float tl_x = 0.0f, tl_y = 0.0f;
    float tr_x = 0.0f, tr_y = 0.0f;
    float br_x = 0.0f, br_y = 0.0f;
    float bl_x = 0.0f, bl_y = 0.0f;

    static CornerRadii circular(float tl, float tr, float br, float bl) {
        return {tl, tl, tr, tr, br, br, bl, bl};
    }
};

CornerRadii fit_corner_radii(float width, float height, CornerRadii radii);

struct BandedBorder {
    View::BorderStyle style = View::BorderStyle::outset;
    float width = 0.0f; 
    float height = 0.0f;
    float top = 0.0f; 
    float right = 0.0f;
    float bottom = 0.0f;
    float left = 0.0f;
    Color top_color;
    Color right_color;
    Color bottom_color;
    Color left_color;
    float radius_tl = 0.0f; 
    float radius_tr = 0.0f;
    float radius_br = 0.0f;
    float radius_bl = 0.0f;
};

void paint_banded_border(canvas::Canvas& canvas, const BandedBorder& border);
 
} // namespace pulp::view