From ecb04c8bbe4abb84d24865b9caa3062a5e06b278 Mon Sep 17 00:00:00 2001
From: Brendan Dahl <brendan.dahl@gmail.com>
Date: Thu, 11 Apr 2013 11:19:42 -0700
Subject: [PATCH] Use at least 1x1 pixel canvas for groups.
---
src/canvas.js | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/src/canvas.js b/src/canvas.js
index 6dd5b2b03..8ce8e6f1f 100644
--- a/src/canvas.js
+++ b/src/canvas.js
@@ -1422,9 +1422,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
group.bbox,
currentCtx.mozCurrentTransform);
// Use ceil in case we're between sizes so we don't create canvas that is
- // too small.
- var drawnWidth = Math.ceil(bounds[2] - bounds[0]);
- var drawnHeight = Math.ceil(bounds[3] - bounds[1]);
+ // too small and make the canvas at least 1x1 pixels.
+ var drawnWidth = Math.max(Math.ceil(bounds[2] - bounds[0]), 1);
+ var drawnHeight = Math.max(Math.ceil(bounds[3] - bounds[1]), 1);
+
var scratchCanvas = createScratchCanvas(drawnWidth, drawnHeight);
var groupCtx = scratchCanvas.getContext('2d');
addContextCurrentTransform(groupCtx);