Hand-apply d849d411cff28ef5453085791d0b4d7cd73bd070 from master; replace all assert...

[dcpomatic.git] / src / lib / ratio.cc

diff --git a/src/lib/ratio.cc b/src/lib/ratio.cc
index fc36415c50638e161e73c8bd1df1ed19d3e01e99..29c22c78deadde5d6517a4574192359384f97ce5 100644 (file)
--- a/src/lib/ratio.cc
+++ b/src/lib/ratio.cc
@@ -17,9 +17,10 @@
 
 */
 
-#include <dcp/types.h>
 #include "ratio.h"
 #include "util.h"
+#include <dcp/types.h>
+#include <cfloat>
 
 #include "i18n.h"
 
@@ -73,3 +74,19 @@ Ratio::from_ratio (float r)
        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;
+}