X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fratio.cc;h=fc36415c50638e161e73c8bd1df1ed19d3e01e99;hb=39029279954b1f346d3ba28ec12c58211bfa7436;hp=fbd7022322c5b0e9e02d8e94785baaa54e23c4c5;hpb=4616b19fb5241a54c9d57f7a91bb975f41aed14b;p=dcpomatic.git

diff --git a/src/lib/ratio.cc b/src/lib/ratio.cc
index fbd702232..fc36415c5 100644
--- a/src/lib/ratio.cc
+++ b/src/lib/ratio.cc
@@ -24,7 +24,6 @@
 #include "i18n.h"
 
 using std::string;
-using std::stringstream;
 using std::vector;
 
 vector<Ratio const *> Ratio::_ratios;
@@ -57,3 +56,20 @@ 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;
+}
+