drawImage stops drawing after some offset

## Issue
Using drawImage
stops working when drawing with some offset from 0, 0 point. There's no error or anything it just stops redrawing source canvas onto target canvas at specific place (seems to be dependant on the source canvas size).

## Steps to Reproduce
Install canvas package, then run one of the following gist files (depending on canvas package version) https://gist.github.com/jan-j/15a7768a1962753721b509f5c6b9efc8.
Increase source size if can't reproduce, because I've noticed different behaviour between 2 devices.

Example output (should be whole red)

## Environment
* Version of node-canvas: 2.0.0-alpha.9 or 1.6.9
* Version of node: 8.9.4 or 6.9.0
* Version of GTK: 2.22.1
* Environment: Windows 10 64bit