90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
#ifndef face_hh_INCLUDED
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#define face_hh_INCLUDED
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#include "color.hh"
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#include "flags.hh"
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namespace Kakoune
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{
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enum class Attribute : int
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{
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Normal = 0,
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Underline = 1 << 1,
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CurlyUnderline = 1 << 2,
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Reverse = 1 << 3,
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Blink = 1 << 4,
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Bold = 1 << 5,
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Dim = 1 << 6,
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Italic = 1 << 7,
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Strikethrough = 1 << 8,
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FinalFg = 1 << 9,
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FinalBg = 1 << 10,
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FinalAttr = 1 << 11,
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Final = FinalFg | FinalBg | FinalAttr
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};
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constexpr bool with_bit_ops(Meta::Type<Attribute>) { return true; }
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struct Face
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{
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Color fg = Color::Default;
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Color bg = Color::Default;
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Attribute attributes = Attribute::Normal;
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Color underline = Color::Default;
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friend constexpr bool operator==(const Face& lhs, const Face& rhs)
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{
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return lhs.fg == rhs.fg and
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lhs.bg == rhs.bg and
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lhs.underline == rhs.underline and
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lhs.attributes == rhs.attributes;
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}
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friend constexpr bool operator!=(const Face& lhs, const Face& rhs)
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{
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return not (lhs == rhs);
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}
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friend constexpr size_t hash_value(const Face& val)
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{
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return hash_values(val.fg, val.bg, val.underline, val.attributes);
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}
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};
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inline Face merge_faces(const Face& base, const Face& face)
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{
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auto alpha_blend = [](Color base, Color color) {
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auto blend = [&](unsigned char Color::*field) {
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int blended = (base.*field * (255 - color.a) + color.*field * color.a) / 255;
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return static_cast<unsigned char>(blended <= 255 ? blended : 255);
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};
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int alpha = color.a + base.a * (255 - color.a) / 255;
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return Color{blend(&Color::r), blend(&Color::g), blend(&Color::b),
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static_cast<unsigned char>(alpha <= 255 ? alpha : 255)};
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};
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auto choose = [&](Color Face::*color, Attribute final_attr) {
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if (face.attributes & final_attr)
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return face.*color;
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if (base.attributes & final_attr)
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return base.*color;
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if (face.*color == Color::Default)
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return base.*color;
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if ((base.*color).isRGB() and (face.*color).isRGB() and (face.*color).a != 255)
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return alpha_blend(base.*color, face.*color);
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return face.*color;
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};
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return Face{ choose(&Face::fg, Attribute::FinalFg),
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choose(&Face::bg, Attribute::FinalBg),
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face.attributes & Attribute::FinalAttr ? face.attributes :
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base.attributes & Attribute::FinalAttr ? base.attributes :
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face.attributes | base.attributes,
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choose(&Face::underline, Attribute{0}) };
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}
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}
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#endif // face_hh_INCLUDED
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