1672 #define mult_chan(src, dst, Fa, Fb) MIN ((src) * (Fa) + (dst) * (Fb), 1.0)  in calc_op()  argument
1674     double Fa, Fb;  in calc_op()  local
1733 	    Fb = 1.0;  in calc_op()
1735 	    Fb = MIN (1.0, (1.0 - srca) / dsta);  in calc_op()
1736 	return mult_chan (src, dst, 1.0, Fb);  in calc_op()
1747 	    Fb = 0.0;  in calc_op()
1749 	    Fb = MAX (0.0, 1.0 - (1.0 - srca) / dsta);  in calc_op()
1750 	return mult_chan (src, dst, 0.0, Fb);  in calc_op()
1761 	    Fb = 1.0;  in calc_op()
1763 	    Fb = MIN (1.0, (1.0 - srca) / dsta);  in calc_op()
1764 	return mult_chan (src, dst, 0.0, Fb);  in calc_op()
1772 	    Fb = 1.0;  in calc_op()
1774 	    Fb = MIN (1.0, (1.0 - srca) / dsta);  in calc_op()
1775 	return mult_chan (src, dst, Fa, Fb);  in calc_op()
1783 	    Fb = 0.0;  in calc_op()
1785 	    Fb = MAX (0.0, 1.0 - (1.0 - srca) / dsta);  in calc_op()
1786 	return mult_chan (src, dst, Fa, Fb);  in calc_op()
1794 	    Fb = 1.0;  in calc_op()
1796 	    Fb = MIN (1.0, (1.0 - srca) / dsta);  in calc_op()
1797 	return mult_chan (src, dst, Fa, Fb);  in calc_op()
1801 	    Fb = 0.0;  in calc_op()
1803 	    Fb = MAX (0.0, 1.0 - srca / dsta);  in calc_op()
1804 	return mult_chan (src, dst, 1.0, Fb);  in calc_op()
1822 	    Fb = 1.0;  in calc_op()
1824 	    Fb = MIN (1.0, srca / dsta);  in calc_op()
1825 	return mult_chan (src, dst, 0.0, Fb);  in calc_op()
1836 	    Fb = 0.0;  in calc_op()
1838 	    Fb = MAX (0.0, 1.0 - srca / dsta);  in calc_op()
1839 	return mult_chan (src, dst, 0.0, Fb);  in calc_op()
1847 	    Fb = 0.0;  in calc_op()
1849 	    Fb = MAX (0.0, 1.0 - srca / dsta);  in calc_op()
1850 	return mult_chan (src, dst, Fa, Fb);  in calc_op()
1858 	    Fb = 1.0;  in calc_op()
1860 	    Fb = MIN (1.0, srca / dsta);  in calc_op()
1861 	return mult_chan (src, dst, Fa, Fb);  in calc_op()
1869 	    Fb = 0.0;  in calc_op()
1871 	    Fb = MAX (0.0, 1.0 - srca / dsta);  in calc_op()
1872 	return mult_chan (src, dst, Fa, Fb);  in calc_op()