X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fratio.cc;h=29c22c78deadde5d6517a4574192359384f97ce5;hb=4dbc6ef917aeceb906b1ef1caf6911033e7e2c54;hp=fbd7022322c5b0e9e02d8e94785baaa54e23c4c5;hpb=04533b9cf34ce8089113015715083ee9c5b2b001;p=dcpomatic.git

diff --git a/src/lib/ratio.cc b/src/lib/ratio.cc
index fbd702232..29c22c78d 100644
--- a/src/lib/ratio.cc
+++ b/src/lib/ratio.cc
@@ -17,14 +17,14 @@
 
 */
 
-#include <dcp/types.h>
 #include "ratio.h"
 #include "util.h"
+#include <dcp/types.h>
+#include <cfloat>
 
 #include "i18n.h"
 
 using std::string;
-using std::stringstream;
 using std::vector;
 
 vector<Ratio const *> Ratio::_ratios;
@@ -57,3 +57,36 @@ Ratio::from_id (string i)
 
 	return *j;
 }
+
+/** @return Ratio corresponding to a given fractional ratio (+/- 0.01), or 0 */
+Ratio const *
+Ratio::from_ratio (float r)
+{
+	vector<Ratio const *>::iterator j = _ratios.begin ();
+	while (j != _ratios.end() && fabs ((*j)->ratio() - r) > 0.01) {
+		++j;
+	}
+
+	if (j == _ratios.end ()) {
+		return 0;
+	}
+
+	return *j;
+}
+   
+Ratio const *
+Ratio::nearest_from_ratio (float r)
+{
+	Ratio const * nearest = 0;
+	float distance = FLT_MAX;
+	
+	for (vector<Ratio const *>::iterator i = _ratios.begin (); i != _ratios.end(); ++i) {
+		float const d = fabs ((*i)->ratio() - r);
+		if (d < distance) {
+			distance = d;
+			nearest = *i;
+		}
+	}
+
+	return nearest;
+}