Image loading performance improvements

Performance improvements are achieved by using requestAnimationFrame when a tile's visibility changes, and by not starting with a blank image when creating a new tile image. It seems that even Firefox does not show a loading placeholder when the tile is made visible in an animation.
2012-10-05 09:24:53 +02:00
parent e3a5091ebd
commit 7e5e221c8d
2 changed files with 32 additions and 35 deletions
--- a/tests/Tile/Image.html
+++ b/tests/Tile/Image.html
@@ -2,8 +2,10 @@
 <head>
  <script src="../OLLoader.js"></script>
  <script type="text/javascript">
-    // turn off animation frame handling, so we can check img urls in tests
+    // turn off tile queue, so we can check img urls in tests
    delete OpenLayers.Layer.Grid.prototype.queueTileDraw;
+    // turn off animation, so we don't need to test asynchronously
+    OpenLayers.Animation.requestFrame = function(fn) { fn(); };

    var isMozilla = (navigator.userAgent.indexOf("compatible") == -1);
    var tile;