on second thought, the other UI's might want this value sooner or later, and it's cheaper to calculate it in the stat function

libtransmission/torrent.c

@@ -1023,6 +1023,13 @@ tr_torrentStat( tr_torrent * tor )
             s->eta = TR_ETA_NOT_AVAIL;
             break;
     }
+    
+    if( !checkSeedRatio || s->ratio >= seedRatio || s->ratio == TR_RATIO_INF ) 
+        s->percentRatio = 1.0; 
+    else if( s->ratio == TR_RATIO_NA ) 
+        s->percentRatio = 0.0; 
+    else 
+        s->percentRatio = s->ratio / seedRatio; 
 
     tr_torrentUnlock( tor );
 

libtransmission/transmission.h

@@ -1628,6 +1628,11 @@ typedef struct tr_stat
         @see tr_stat.leftUntilDone */
     float    percentDone;
 
+    /** The percentage of the actual ratio to the seed ratio.  This will be 
+        equal to 1 if the ratio is reached or the torrent is set to seed forever. 
+        Range is [0..1] */ 
+    float    percentRatio; 
+
     /** Speed all data being sent for this torrent. (KiB/s)
         This includes piece data, protocol messages, and TCP overhead */
     double rawUploadSpeed;

macosx/Torrent.m

@@ -343,13 +343,7 @@ int trashDataFile(const char * filename)
 
 - (CGFloat) progressStopRatio
 {
-    double seedRatio;
-    if (!tr_torrentGetSeedRatio(fHandle, seedRatio) || [self ratio] >= seedRatio || [self ratio] == TR_RATIO_INF)
-        return 1.0;
-    else if ([self ratio] == TR_RATIO_NA)
-        return 0.0;
-    else
-        return [self ratio] / seedRatio;
+    return fStat->percentRatio;
 }
 
 - (BOOL) usesSpeedLimit: (BOOL) upload