Only reload album art in the HTTP interface if the track id changes (or if the...

Only reload album art in the HTTP interface if the track id changes (or if the user clicks on the album art to force a reload).

share/http/dialogs/main

@@ -106,7 +106,7 @@ sout and playlist .
     <img src="images/slider_left.png" alt="slider left" /><span id="progressbar" style="background-image: url( 'images/slider_bar.png' ); width: 408px; height:16px; position:absolute;" onclick="slider_seek( event, this );" onmousemove="slider_move( event, this );"><img src="images/slider_point.png" alt="slider point" style="position:relative; left:0px;" id="main_slider_point" onmousedown="slider_down( event, this );" onmouseup="slider_up( event, this.parentNode );" onmouseout="slider_up( event, this.parentNode );"/></span><img src="images/slider_right.png" alt="slider right" style="position:relative;left:408px;" />
     <br/>
     <span id="nowplaying">(?)</span>
-    <img id="albumart" alt="Album art" src="/art" style="float: right" onclick="refresh_albumart();"/>
+    <img id="albumart" alt="" src="/art" style="float: right" onclick="refresh_albumart(true);"/>
   </div>
 </div>
 

share/http/js/functions.js

@@ -27,6 +27,7 @@
 
 var old_time = 0;
 var pl_cur_id;
+var albumart_id = -1;
 
 /**********************************************************************
  * Slider functions
@@ -1039,11 +1040,15 @@ function browse_path( p )
     hide( 'browse' );
     document.getElementById( value( 'browse_dest' ) ).focus();
 }
-function refresh_albumart()
+function refresh_albumart( force )
 {
+    if( albumart_id != pl_cur_id || force )
+    {
         var now = new Date();
         var albumart = document.getElementById( 'albumart' );
         albumart.src = '/art?timestamp=' + now.getTime();
+        albumart_id = pl_cur_id;
+    }
 }
 /**********************************************************************
  * Periodically update stuff in the interface
@@ -1060,8 +1065,8 @@ function loop_refresh_playlist()
 }
 function loop_refresh_albumart()
 {
-    setTimeout( 'loop_refresh_albumart()', 10000 );
-    refresh_albumart();
+    setTimeout( 'loop_refresh_albumart()', 1000 );
+    refresh_albumart( false );
 }
 function loop_refresh()
 {