Fix round-off errors in getViewportOriginPixels() and getViewportSizePixels(). By Rune Torkildsen.
Fix round-off errors in getViewportOriginPixels() and getViewportSizePixels(). By Rune Torkildsen.

Alexpux/Coin3D,Alexpux/Coin3D,Alexpux/Coin3D,Alexpux/Coin3D