129 #define SWAP(a, b) \  in PetscImageDrawTriangle()  macro
137     SWAP(x_1, x_2);  in PetscImageDrawTriangle()
138     SWAP(y_1, y_2);  in PetscImageDrawTriangle()
139     SWAP(t_1, t_2);  in PetscImageDrawTriangle()
142     SWAP(x_1, x_3);  in PetscImageDrawTriangle()
143     SWAP(y_1, y_3);  in PetscImageDrawTriangle()
144     SWAP(t_1, t_3);  in PetscImageDrawTriangle()
147     SWAP(x_2, x_3);  in PetscImageDrawTriangle()
148     SWAP(y_2, y_3);  in PetscImageDrawTriangle()
149     SWAP(t_2, t_3);  in PetscImageDrawTriangle()
151 #undef SWAP  in PetscImageDrawTriangle()