From c929bacde8e2c94c726ef7d33e3acc3431ace7c5 Mon Sep 17 00:00:00 2001
From: Jonathan Puckey <me@jonathanpuckey.com>
Date: Thu, 24 Feb 2011 01:33:36 +0100
Subject: [PATCH] Clean up Group#draw and save/restore context state when
 drawing group with opacity.

---
 src/item/Group.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/item/Group.js b/src/item/Group.js
index 9976cb68..552cd5c6 100644
--- a/src/item/Group.js
+++ b/src/item/Group.js
@@ -17,10 +17,10 @@ Group = Item.extend({
 		// If the group has an opacity of less then 1, draw its children on a
 		// temporary canvas, and then draw that canvas onto ctx afterwards
 		// with globalAlpha set.
+		var tempCanvas, originalCtx;
 		if (this.opacity < 1) {
 			var originalCtx = ctx;
-			var size = this.document.size;
-			var tempCanvas = CanvasProvider.getCanvas(size.width, size.height);
+			tempCanvas = CanvasProvider.getCanvas(this.document.size);
 			ctx = tempCanvas.getContext('2d');
 		}
 		for (var i = 0, l = this.children.length; i < l; i++) {
@@ -29,8 +29,10 @@ Group = Item.extend({
 				ctx.clip();
 		}
 		if (tempCanvas) {
+			originalCtx.save();
 			originalCtx.globalAlpha = this.opacity;
 			originalCtx.drawImage(tempCanvas, 0, 0);
+			originalCtx.restore();
 			// Return the canvas, so it can be reused
 			CanvasProvider.returnCanvas(tempCanvas);
 		}