Fast path for BGRA to RGBA readPixels conversions.

From http://code.google.com/p/angleproject/source/detail?r=1999

TRAC #22825

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@2033 736b8ea6-26fd-11df-bfd4-992fa37f6226
2 files changed