1. used 4 bytes out of a reserved 16 bytes section to store perm u32
2. add FLAGS_FD_UNIX_MODE: u32 = 0x08, used with flags, indicating this
message is from UNIX peer
Signed-off-by: ClSlaid <cailue@bupt.edu.cn>
1. updateCurDisplay, canvas origin (x,y)
2. Do not show "Show displays as individual windows" on non-texture
render version.
Signed-off-by: dignow <linlong1265@gmail.com>