doesn't render smoothly when container with/height are percentages

```
What steps will reproduce the problem?
1. in your container div, set the width and height to a percent

What is the expected output? What do you see instead?
- The output will be an extremely pixilated representation of your scan.

What version of the product are you using? On what operating system?
- I believe the latest. 1.6.5

Please provide any additional information below.
I've been able to compare the results by setting my container div to a width of
400px by 400px, then 50% by 50%. the results (atleast on my screen), so a box
that's close to the same dimensions, but the quality is pretty poor on the
version using percentages. I haven't been able to find a way to overcome this.
I'm implementing this into a responsive design, so having this be able to scale
is really important.

```

Original issue reported on code.google.com by `faceless...@gmail.com` on 2 Jan 2015 at 6:50

Reproduce the scan in version 1.6.5 using a container sized at 400px by 400px and then at 50% by 50%. Start by tracing how percentage-sized container dimensions are handled, and consider the issue done when the responsive version renders with comparable quality instead of becoming extremely pixelated.

Written by the indexing model from the issue text.