From 747bbd5502fa727b93d5e7c3d68d3e33ea089ef3 Mon Sep 17 00:00:00 2001
From: Robert Kaiser <kairo@kairo.at>
Date: Sun, 27 Jan 2013 21:07:01 +0100
Subject: [PATCH] add an if to make it possible to turn off the optimized path
 for debugging

---
 js/map.js | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/js/map.js b/js/map.js
index ec60e01..22307dc 100644
--- a/js/map.js
+++ b/js/map.js
@@ -459,13 +459,20 @@ var mapEvHandler = {
           var dY = y - gLastMouseY;
           gPos.x -= dX * gZoomFactor;
           gPos.y -= dY * gZoomFactor;
-          var mapData = gMapContext.getImageData(0, 0, gMapCanvas.width, gMapCanvas.height);
-          gMapContext.clearRect(0, 0, gMapCanvas.width, gMapCanvas.height);
-          gMapContext.putImageData(mapData, dX, dY);
-          drawMap({left: (dX > 0) ? dX : 0,
-                   right: (dX < 0) ? -dX : 0,
-                   top: (dY > 0) ? dY : 0,
-                   bottom: (dY < 0) ? -dY : 0});
+          if (true) { // use optimized path
+            var mapData = gMapContext.getImageData(0, 0,
+                                                   gMapCanvas.width,
+                                                   gMapCanvas.height);
+            gMapContext.clearRect(0, 0, gMapCanvas.width, gMapCanvas.height);
+            gMapContext.putImageData(mapData, dX, dY);
+            drawMap({left: (dX > 0) ? dX : 0,
+                     right: (dX < 0) ? -dX : 0,
+                     top: (dY > 0) ? dY : 0,
+                     bottom: (dY < 0) ? -dY : 0});
+          }
+          else {
+            drawMap(false, true);
+          }
           showUI();
         }
         gLastMouseX = x;
-- 
2.35.3