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#if defined(Hiro_Gradient)
struct Gradient {
using type = Gradient;
Gradient();
explicit operator bool() const;
auto operator==(const Gradient& source) const -> bool;
auto operator!=(const Gradient& source) const -> bool;
auto setBilinear(Color topLeft, Color topRight, Color bottomLeft, Color bottomRight) -> type&;
auto setHorizontal(Color left, Color right) -> type&;
auto setVertical(Color top, Color bottom) -> type&;
//private:
struct State {
vector<Color> colors;
} state;
};
#endif
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