MPIO HD200 grey blitting: Use line reads for the pixel values as well. Almost doubles the ISR speed (47% -> 24% load), giving 42% faster greylib framebuffer updates.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27444 a1c6a512-1295-4272-9138-f99709370657
1 file changed