From 2a7d73a8c480bceafb04f6b0df533b8176e6be7e Mon Sep 17 00:00:00 2001
From: dodo <dodo.the.last@googlemail.com>
Date: Thu, 2 Dec 2010 01:32:49 +0100
Subject: [PATCH] rewrite render function

---
 lib/node-canvas-svg.js | 83 ++++++++++++++++++++++++------------------
 1 file changed, 47 insertions(+), 36 deletions(-)

diff --git a/lib/node-canvas-svg.js b/lib/node-canvas-svg.js
index d33728e..bd09571 100644
--- a/lib/node-canvas-svg.js
+++ b/lib/node-canvas-svg.js
@@ -40,49 +40,57 @@ var parse_data = function (data, type) {
 };
 
 
-exports.svg.render = function (svgdata/*, width, height, options, callback*/) {
+exports.svg.render = function (/*canvas, svgdata, width, height, options, callback*/) {
     check_canvg();
-    var args = new Vargs(arguments);
-    if (!svgdata)
-        return args.callback(new Error("no svg given"), new Canvas(42, 42));
-
-    var doc = jsdom.jsdom(),
-        win = doc.createWindow(),
-        DOMParser = function () {
-            this.parseFromString = function (data, type) {
-                var res = parse_data(data, type);
-                //if (/*err*/res[0]) ### /*ignored*/ ###
-                //    throw res[0];
-                return { documentElement : patch.nodeName(res[1]) };
-            };
-        };
-    win.DOMParser = true;
-
-    var width, height;
-    if (args.length > 2) {
-        width = args.all[1];
-        height = args.all[2];
+    var args = new Vargs(arguments),
+        arglist = args.all.slice(0);
 
+    var svgdata = "", canvas = null;
+    if (typeof args.first === 'string') {
+        svgdata = args.shift();
     } else {
-        var res = parse_data(svgdata);
-        if (/*err*/res[0])
-            return args.callback(res[0], new Canvas(42, 42));
-        var elem = res[1];
-        svgdata = elem.outerHTML; // maybe cleaner
-
-        width = elem.hasAttribute('width') ?
-            parseInt(elem.getAttribute('width')) : 42;
-        height = elem.hasAttribute('height') ?
-            parseInt(elem.getAttribute('height')) : 42;
+        canvas = args.shift();
+        svgdata = args.shift();
     }
 
-    var canvas = new Canvas(width, height);
+    if (!svgdata)
+        return args.callback(new Error("no svg given"), new Canvas(42, 42));
 
-    var options = {};
-    if (args.length  == 2 || args.length > 3)
-        options = args.last;
+    if (!canvas) {
+        var doc = jsdom.jsdom(),
+            win = doc.createWindow(),
+            DOMParser = function () {
+                this.parseFromString = function (data, type) {
+                    var res = parse_data(data, type);
+                    //if (/*err*/res[0]) ### /*ignored*/ ###
+                    //    throw res[0];
+                    return { documentElement : patch.nodeName(res[1]) };
+                };
+            };
+        win.DOMParser = true;
+
+        var width, height;
+        if (arglist.length > 1) {
+            width = arglist.shift();
+            height = arglist.shift();
+
+        } else {
+            var res = parse_data(svgdata);
+            if (/*err*/res[0])
+                return args.callback(res[0], new Canvas(42, 42));
+            var elem = res[1];
+            svgdata = elem.outerHTML; // maybe cleaner
+
+            width = elem.hasAttribute('width') ?
+                parseInt(elem.getAttribute('width')) : 42;
+            height = elem.hasAttribute('height') ?
+                parseInt(elem.getAttribute('height')) : 42;
+        }
+        canvas = new Canvas(width, height);
+    }
 
-    var defaults = {
+    var options = arglist ? args.last : {},
+        defaults = {
         renderCallback : function () { args.callback(null, canvas) },
         ignoreMouse: true,
         ignoreAnimation: true,
@@ -105,5 +113,8 @@ exports.svg.render = function (svgdata/*, width, height, options, callback*/) {
     }
 };
 
+
+exports.Canvas = Canvas;
+
 exports.load = require('./canvas-svg/loader')(depdir, vargs, svg);