273 real64 dng_exif::SnapExposureTime (real64 et)  in SnapExposureTime()  argument
278 	if (et <= 0.0)  in SnapExposureTime()
363 		real64 testSpeed = et;  in SnapExposureTime()
371 			if (et >= 0.1)  in SnapExposureTime()
380 			else if (et >= 0.01)  in SnapExposureTime()
423 	if (et >= 10.0)  in SnapExposureTime()
428 		et = floor (et + 0.5);  in SnapExposureTime()
432 	else if (et >= 0.5)  in SnapExposureTime()
437 		et = floor (et * 10.0 + 0.5) * 0.1;  in SnapExposureTime()
441 	else if (et >= 1.0 / 20.0)  in SnapExposureTime()
446 		et = 1.0 / floor (1.0 / et + 0.5);  in SnapExposureTime()
450 	else if (et >= 1.0 / 130.0)  in SnapExposureTime()
455 		et = 0.2 / floor (0.2 / et + 0.5);  in SnapExposureTime()
459 	else if (et >= 1.0 / 750.0)  in SnapExposureTime()
464 		et = 0.1 / floor (0.1 / et + 0.5);  in SnapExposureTime()
468 	else if (et >= 1.0 / 1300.0)  in SnapExposureTime()
473 		et = 0.02 / floor (0.02 / et + 0.5);  in SnapExposureTime()
477 	else if (et >= 1.0 / 15000.0)  in SnapExposureTime()
482 		et = 0.01 / floor (0.01 / et + 0.5);  in SnapExposureTime()
491 		et = 0.001 / floor (0.001 / et + 0.5);  in SnapExposureTime()
495 	return et;  in SnapExposureTime()
501 void dng_exif::SetExposureTime (real64 et, bool snap)  in SetExposureTime()  argument
511 		et = SnapExposureTime (et);  in SetExposureTime()
515 	if (et >= 1.0 / 32768.0 && et <= 32768.0)  in SetExposureTime()
518 		if (et >= 100.0)  in SetExposureTime()
521 			fExposureTime.Set_real64 (et, 1);  in SetExposureTime()
525 		else if (et >= 1.0)  in SetExposureTime()
528 			fExposureTime.Set_real64 (et, 10);  in SetExposureTime()
534 		else if (et <= 0.1)  in SetExposureTime()
537 			fExposureTime = dng_urational (1, Round_uint32 (1.0 / et));  in SetExposureTime()
544 			fExposureTime.Set_real64 (et, 100);  in SetExposureTime()
551 				real64 z = 1.0 / (real64) f / et;  in SetExposureTime()
568 		et = fExposureTime.As_real64 ();  in SetExposureTime()
570 		fShutterSpeedValue.Set_real64 (-log (et) / log (2.0), 1000000);  in SetExposureTime()
591 		real64 et = pow (2.0, -ss);  in SetShutterSpeedValue()  local
593 		SetExposureTime (et, true);  in SetShutterSpeedValue()
1458 			dng_urational et = stream.TagValue_urational (tagType);  in Parse_ifd0_exif()  local
1460 			SetExposureTime (et.As_real64 (), true);  in Parse_ifd0_exif()
1469 				DumpExposureTime (et.As_real64 ());  in Parse_ifd0_exif()
1475 			if (et.As_real64 () <= 0.0)  in Parse_ifd0_exif()
2037 				real64 et = fExposureTime.As_real64 ();  in Parse_ifd0_exif()  local
2039 				real64 tv1 = -1.0 * log (et) / log (2.0);  in Parse_ifd0_exif()