745 #define itrunc(x,m)	((m)==SGILOGENCODE_NODITHER ? \  macro
775 		return itrunc(256.*(log2(Y) + 64.), em);  in LogL16fromY()
777 		return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));  in LogL16fromY()
853 		return itrunc(64.*(log2(Y) + 12.), em);  in LogL10fromY()
923 	vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);  in uv_encode()
928 	ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);  in uv_encode()
1097 			Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);  in Luv24fromLuv48()
1153 	else ue = itrunc(UVSCALE*u, em);  in LogLuv32fromXYZ()
1156 	else ve = itrunc(UVSCALE*v, em);  in LogLuv32fromXYZ()
1236 	(itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |  in Luv32fromLuv48()
1237 		(itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);  in Luv32fromLuv48()