Improve peak reading efficiency.

Timeline/Audio_File.C

@@ -75,15 +75,7 @@ Audio_File::read_peaks( float fpp, nframes_t start, nframes_t end, int *peaks, P
 
     *channels = this->channels();
 
-    *pbuf = new Peak[ *peaks * *channels ];
-
-    memcpy( *pbuf, pk.peakbuf(), *peaks * *channels * sizeof( Peak ) );
-
-/*     /\* deintereave peaks *\/ */
-/*     int k = 0; */
-/*     for ( int i = 0; i < *channels; i++ ) */
-/*         for ( int j = i; j < *peaks * *channels; j += *channels ) */
-/*             (*pbuf)[ k++ ] = pk.peakbuf()[ j ]; */
+    *pbuf = pk.peakbuf();
 
     return true;
 }

Timeline/Peaks.C

@@ -129,12 +129,16 @@ Peaks::read_peakfile_peaks ( Peak *peaks, nframes_t s, int npeaks, int chunksize
             p.min = 0;
             p.max = 0;
 
-            for ( int k = j; k < len * channels; k += channels )
+            const Peak *pb = pbuf + j;
+
+            for ( int k = len * channels; k--; pb += channels )
             {
-                if ( pbuf[ k ].max > p.max )
-                    p.max = pbuf[ k ].max;
-                if ( pbuf[ k ].min < p.min )
-                    p.min = pbuf[ k ].min;
+                const Peak pp = *pb;
+
+                if ( pp.max > p.max )
+                    p.max = pp.max;
+                if ( pp.min < p.min )
+                    p.min = pp.min;
             }
 
         }

Timeline/Region.C

@@ -656,9 +656,6 @@ Region::draw ( void )
                             pbuf + i, peaks, channels,
                             selected() ? fl_invert_color( _color ) : _color );
         }
-
-        delete[] pbuf;
-
     }
 
     timeline->draw_measure_lines( rx, Y, rw, H, _box_color );