Improve style and speed

physikerwelt · physikerwelt · commit 073ff3d1645f · 2016-02-26T18:15:10.000+01:00
Replace delete with "= undefined".
diff --git a/lib/mj-single.js b/lib/mj-single.js
@@ -508,26 +508,26 @@ function GetSVG(result) {
 function GetPNG(result) {
     var s = new Readable();
     var pngScale = 2;
-    var svgFile = result.svgfile; delete result.svgfile;
-    var width = result.width; delete result.width;
-    var height = result.height; delete result.height;
+    var svgFile = result.svgfile; result.svgfile=undefined;
+    var width = result.width; result.width=undefined;
+    var height = result.height; result.height=undefined;
     if (data.png) {
-            var svgRenderer = new rsvg();
-            s._read = function () {
-                s.push(svgFile);
-                s.push(null);
-            };
-            var synch = MathJax.Callback(function () {}); // for synchronization with MathJax
-            svgRenderer.on('finish', function () {
-                var buffer = svgRenderer.render({
-                    format: 'png',
-                    width: width * pngScale,
-                    height: height * pngScale
-                }).data;
-                result.png = "data:image/png;base64," + (buffer || "").toString('base64');
-                synch();
-            });
-            s.pipe(svgRenderer);
+        var svgRenderer = new rsvg();
+        s._read = function () {
+            s.push(svgFile);
+            s.push(null);
+        };
+        var synch = MathJax.Callback(function () {}); // for synchronization with MathJax
+        svgRenderer.on('finish', function () {
+            var buffer = svgRenderer.render({
+                format: 'png',
+                width: width * pngScale,
+                height: height * pngScale
+            }).data;
+            result.png = "data:image/png;base64," + (buffer || "").toString('base64');
+            synch();
+        });
+        s.pipe(svgRenderer);
         return synch;  // This keeps the queue from continuing until the readFile() is complete
     }
 }
