Answer
Spoiler: .
The image you posted is of my snapshot at 800x480 and at that resolution, pixelation will happen especially for lines near 0/180 or 90/270 degrees. On a hdpi device you will not see issue (only when snapshots are made) If you have issue with it, get a hi-res device.
Any settings regarding opengl, you have to use opengl driver for it to work.
