120 bool inverse(const Matrix* m, Matrix* out)  in inverse()  argument
122     auto det = m->e11 * (m->e22 * m->e33 - m->e32 * m->e23) -  in inverse()
123                m->e12 * (m->e21 * m->e33 - m->e23 * m->e31) +  in inverse()
124                m->e13 * (m->e21 * m->e32 - m->e22 * m->e31);  in inverse()
129     out->e11 = (m->e22 * m->e33 - m->e32 * m->e23) * invDet;  in inverse()
130     out->e12 = (m->e13 * m->e32 - m->e12 * m->e33) * invDet;  in inverse()
131     out->e13 = (m->e12 * m->e23 - m->e13 * m->e22) * invDet;  in inverse()
132     out->e21 = (m->e23 * m->e31 - m->e21 * m->e33) * invDet;  in inverse()
133     out->e22 = (m->e11 * m->e33 - m->e13 * m->e31) * invDet;  in inverse()
134     out->e23 = (m->e21 * m->e13 - m->e11 * m->e23) * invDet;  in inverse()
135     out->e31 = (m->e21 * m->e32 - m->e31 * m->e22) * invDet;  in inverse()
136     out->e32 = (m->e31 * m->e12 - m->e11 * m->e32) * invDet;  in inverse()
137     out->e33 = (m->e11 * m->e22 - m->e21 * m->e12) * invDet;  in inverse()
143 bool identity(const Matrix* m)  in identity()  argument
145     if (m->e11 != 1.0f || m->e12 != 0.0f || m->e13 != 0.0f ||  in identity()
146         m->e21 != 0.0f || m->e22 != 1.0f || m->e23 != 0.0f ||  in identity()
147         m->e31 != 0.0f || m->e32 != 0.0f || m->e33 != 1.0f) {  in identity()
154 void rotate(Matrix* m, float degree)  in rotate()  argument
162     m->e12 = m->e11 * -sinVal;  in rotate()
163     m->e11 *= cosVal;  in rotate()
164     m->e21 = m->e22 * sinVal;  in rotate()
165     m->e22 *= cosVal;  in rotate()
171     Matrix m;  in operator *()  local
173     m.e11 = lhs.e11 * rhs.e11 + lhs.e12 * rhs.e21 + lhs.e13 * rhs.e31;  in operator *()
174     m.e12 = lhs.e11 * rhs.e12 + lhs.e12 * rhs.e22 + lhs.e13 * rhs.e32;  in operator *()
175     m.e13 = lhs.e11 * rhs.e13 + lhs.e12 * rhs.e23 + lhs.e13 * rhs.e33;  in operator *()
177     m.e21 = lhs.e21 * rhs.e11 + lhs.e22 * rhs.e21 + lhs.e23 * rhs.e31;  in operator *()
178     m.e22 = lhs.e21 * rhs.e12 + lhs.e22 * rhs.e22 + lhs.e23 * rhs.e32;  in operator *()
179     m.e23 = lhs.e21 * rhs.e13 + lhs.e22 * rhs.e23 + lhs.e23 * rhs.e33;  in operator *()
181     m.e31 = lhs.e31 * rhs.e11 + lhs.e32 * rhs.e21 + lhs.e33 * rhs.e31;  in operator *()
182     m.e32 = lhs.e31 * rhs.e12 + lhs.e32 * rhs.e22 + lhs.e33 * rhs.e32;  in operator *()
183     m.e33 = lhs.e31 * rhs.e13 + lhs.e32 * rhs.e23 + lhs.e33 * rhs.e33;  in operator *()
185     return m;  in operator *()
200 void operator*=(Point& pt, const Matrix& m)  in operator *=()  argument
202     auto tx = pt.x * m.e11 + pt.y * m.e12 + m.e13;  in operator *=()
203     auto ty = pt.x * m.e21 + pt.y * m.e22 + m.e23;  in operator *=()
209 Point operator*(const Point& pt, const Matrix& m)  in operator *()  argument
211     auto tx = pt.x * m.e11 + pt.y * m.e12 + m.e13;  in operator *()
212     auto ty = pt.x * m.e21 + pt.y * m.e22 + m.e23;  in operator *()