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 fbd7022322c5b0e9e02d8e94785baaa54e23c4c5..29c22c78deadde5d6517a4574192359384f97ce5 100644 (file)
--- 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;
+}