black imege background when set custom size

[Mateusz86]

for exaple on initial i set
viewport: { width: 200, height: 100, type: 'square' },

and result
result({ type:"base64", format:'jpg', backgroundColor : "#ffffff", size:{ width:400, height:200 }
When image is drag away outside viewport i get black image 400x200px in white rectangle 200x100

To improve to the code function _getCanvas
Instead of
if (data.backgroundColor) { ctx.fillStyle = data.backgroundColor; ctx.fillRect(0, 0, outWidth, outHeight); }

should be changed to
if (data.backgroundColor) { ctx.fillStyle = data.backgroundColor; ctx.fillRect(0, 0, canvas.width, canvas.height); }