98   double determinant;  in InvertAffineCoefficients()  local
100   determinant=PerceptibleReciprocal(coeff[0]*coeff[4]-coeff[1]*coeff[3]);  in InvertAffineCoefficients()
101   inverse[0]=determinant*coeff[4];  in InvertAffineCoefficients()
102   inverse[1]=determinant*(-coeff[1]);  in InvertAffineCoefficients()
103   inverse[2]=determinant*(coeff[1]*coeff[5]-coeff[2]*coeff[4]);  in InvertAffineCoefficients()
104   inverse[3]=determinant*(-coeff[3]);  in InvertAffineCoefficients()
105   inverse[4]=determinant*coeff[0];  in InvertAffineCoefficients()
106   inverse[5]=determinant*(coeff[2]*coeff[3]-coeff[0]*coeff[5]);  in InvertAffineCoefficients()
113   double determinant;  in InvertPerspectiveCoefficients()  local
115   determinant=PerceptibleReciprocal(coeff[0]*coeff[4]-coeff[3]*coeff[1]);  in InvertPerspectiveCoefficients()
116   inverse[0]=determinant*(coeff[4]-coeff[7]*coeff[5]);  in InvertPerspectiveCoefficients()
117   inverse[1]=determinant*(coeff[7]*coeff[2]-coeff[1]);  in InvertPerspectiveCoefficients()
118   inverse[2]=determinant*(coeff[1]*coeff[5]-coeff[4]*coeff[2]);  in InvertPerspectiveCoefficients()
119   inverse[3]=determinant*(coeff[6]*coeff[5]-coeff[3]);  in InvertPerspectiveCoefficients()
120   inverse[4]=determinant*(coeff[0]-coeff[6]*coeff[2]);  in InvertPerspectiveCoefficients()
121   inverse[5]=determinant*(coeff[3]*coeff[2]-coeff[0]*coeff[5]);  in InvertPerspectiveCoefficients()
122   inverse[6]=determinant*(coeff[3]*coeff[7]-coeff[6]*coeff[4]);  in InvertPerspectiveCoefficients()
123   inverse[7]=determinant*(coeff[6]*coeff[1]-coeff[0]*coeff[7]);  in InvertPerspectiveCoefficients()