webrev for arm FB screen capture

[David Hill]

fixing some issues I found with a 565 based display and Robot screen capture. Will tackle Monocle later now that I understand better the framebuffer capture issues.

jira:    https://javafx-jira.kenai.com/browse/RT-35910
review:  http://cr.openjdk.java.net/~ddhill/RT-35910/

-- 
David Hill <David.Hill at Oracle.com>
Java Embedded Development

"Experience is that marvelous thing that enables you to recognize a mistake when you make it again."
-- Franklin P. Jones