gecko/gfx/ycbcr/README

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This color conversion code is from the Chromium open source project available here:
http://code.google.com/chromium/
The code comes from svn revision 638400 on 2010-10-26.
The code was copied from a Chromium svn checkout using the 'update.sh' script which then applies patches for our build and to add dynamic CPU detection.
convert.patch: Change Chromium code to build using Mozilla build system.
Add runtime CPU detection for MMX
Move default C implementation to work on all platforms.
Change Chromium code to allow a picture region.
The YUV conversion will convert within this
picture region only.
Add YCbCr 4:4:4 support