rive-cpp/include/math/mat2d.hpp

#ifndef _RIVE_MAT2D_HPP_
#define _RIVE_MAT2D_HPP_

#include <cstddef>

namespace rive
{
	class Vec2D;
	class TransformComponents;
	class Mat2D
	{
	private:
		float m_Buffer[6];

	public:
		Mat2D();
		Mat2D(const Mat2D& copy);

		inline const float* values() const { return m_Buffer; }

		float& operator[](std::size_t idx) { return m_Buffer[idx]; }
		const float& operator[](std::size_t idx) const { return m_Buffer[idx]; }

		static void identity(Mat2D& result)
		{
			result[0] = 1.0f;
			result[1] = 0.0f;
			result[2] = 0.0f;
			result[3] = 1.0f;
			result[4] = 0.0f;
			result[5] = 0.0f;
		}

		static void fromRotation(Mat2D& result, float rad);
		static void scale(Mat2D& result, const Mat2D& mat, const Vec2D& vec);
		static void multiply(Mat2D& result, const Mat2D& a, const Mat2D& b);
		static bool invert(Mat2D& result, const Mat2D& a);
		static void copy(Mat2D& result, const Mat2D& a);
		static void decompose(TransformComponents& result, const Mat2D& m);
		static void compose(Mat2D& result, const TransformComponents& components);
		static void scaleByValues(Mat2D& result, float sx, float sy);

		float xx() const { return m_Buffer[0]; }
		float xy() const { return m_Buffer[1]; }
		float yx() const { return m_Buffer[2]; }
		float yy() const { return m_Buffer[3]; }
		float tx() const { return m_Buffer[4]; }
		float ty() const { return m_Buffer[5]; }
	};

	inline Mat2D operator*(const Mat2D& a, const Mat2D& b)
	{
		Mat2D result;
		Mat2D::multiply(result, a, b);
		return result;
	}
} // namespace rive
#endif